Retensionable DYWIDAG Strand Anchor - DSI Underground Austria · Declaration of Performance No. 18b-13/0815-DSI.MA-XX Y1770S7/Y1860S7-15.3/15.7 dated 19/12/2018 ETA-13/0839 Austrian

Retensionable DYWIDAG Strand

Anchor with 2 to 15 prestressing steel

strands Y 1770S7 BMVIT-327.120/0017-IV/IVVS2/2018

BMVIT-327.120/0017-IV/IVVS2/2018

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Specification Sheet

Subject of approval: Retensionable DYWIDAG Strand Anchor with 2

to 15 prestressing steel strands Y 1770S7 – 15.3 mm and 15.7

mm and Y 1860S7 – 15.3 and 15.7 mm (140 and 150 mm²) as

temporary strand anchors, temporary strand anchors for

extended short-term use, permanent anchors and, optionally,

as staggered anchors

Approval holder: DSI Underground AUSTRIA GmbH

Alfred-Wagner-Strasse 1

4061 Pasching/Linz/Austria

Holder of the ETA for the post- DYWIDAG-Systems International GmbH

tensioning system Destouchesstrasse 68

80796 Munich/Germany

Producer of the post- tensioning DYWIDAG-Systems International GmbH system components: Max-Plank-Ring 1

40764 Langenfeld/Germany

Producer of the anchor- specific DYWIDAG-Systems International GmbH

components, the corrosion Germanenstrasse 8

protection system and anchor: 86343 Königsbrunn/Germany

External monitoring TÜV Austria TVFA Prüf- und Forschungs GmbH (TÜV

AUSTRIA TVFA)

Geographical Scope: Republic of Austria, A-roads

Reference ÖNORM EN 1537: 2015; Execution of special geotechnical works - Ground anchors

ÖNORM B 1997-1-1: 2013; Eurocode 7 – Geotechnical Design

– Part 1: General rules – National specifications concerning

ÖNORM EN 1997-1 and national supplements

ETA-13/0815 Austrian Institute of Construction Engineering

(OIB) dated 25/06/2018

DYWIDAG strand post-tensioning system for prestressing of structures with 3 to 55 strands, MPA

NRW Certificate of Constancy of Performance No.

0432-CPR-00301-05.1 dated 23/07/2018,

Declaration of Performance No. 18b-13/0815-DSI.MA-XX Y1770S7/Y1860S7-15.3/15.7 dated 19/12/2018

ETA-13/0839 Austrian Institute of Construction Engineering

dated 11/12/2017

SUSPA strand post-tensioning system for prestressing of structures with 1 to 22 strands

MPA NRW Certificate of Constancy of Performance No.

0432-CPR-00301-06.1 dated 23/07/2018,

Declaration of Performance No. 18a-13/0839-DSI.EE-XX Y1770S7/Y1860S7-15.7

This approval comprises 12 pages of text and 19 annexes

BMVIT-327.120/0017-IV/IVVS2/2018

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I. General Regulations

This approval by the BMVIT (Federal Ministry for Transport, Innovation and Technology) verifies that

the subject of approval is suitable for its intended use. This approval is issued on the basis of

specifications not covered by a harmonized standard and without prejudice to possible third-party rights.

The suitability of the subject of the approval has been assessed on the basis of the corresponding test

results and reports submitted concerning the subject’s decisive properties and area of application in accordance with the corresponding Eurocodes, standards and guidelines.

Technical specifications or standards and guidelines, which are not stated with their publication date in

this Specification Sheet, apply in their current version.

The approval holder and the manufacturer of the anchor are responsible for the construction product’s

conformity with the approval and Specification Sheet for the approval and ensure all the characteristics guaranteed for the construction product.

The approval only refers to the construction product of the named approval holder and manufacturer.

The BMVIT is entitled to check compliance with the regulations of this approval and the Specification

Sheet at the approval holder’s expense.

The BMVIT shall be entitled to revoke this approval. This applies in particular in the event of new

technical advances and standards.

The letter of approval and the Specification Sheet for approval may only be reproduced in full. Texts

and drawings used for advertising purposes must not contradict the approval.

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II. Special Regulations

Contents

1. General Information .....................................................................................................................3

2. Reference Standards .....................................................................................................................4

3. Description of the Ground Anchor ................................................................................................5

4. Scope of Application ....................................................................................................................7

5. Construction Materials and Products .............................................................................................8

5.1. Tendon .........................................................................................................................................8

5.1.1. Steel tendon characteristics ...........................................................................................................8

5.1.2. Anchor load bearing capacity requirements ...................................................................................8

5.2. Anchor head .................................................................................................................................8

5.2.1. Anchor head design ......................................................................................................................8

5.2.2. Load transfer to the supporting structure .......................................................................................9

5.3. Grouting mortar ............................................................................................................................9

5.4. Corrosion protection .....................................................................................................................9

5.4.1. Temporary strand anchor ............................................................................................................ 10

5.4.2. Temporary strand anchor for extended short-term use ................................................................. 10

5.4.3. Permanent strand anchor ............................................................................................................. 10

5.4.4. Staggered anchors....................................................................................................................... 11

6. Installation ................................................................................................................................. 11

7. Tests........................................................................................................................................... 12

7.1. Material tests and proof of conformity ........................................................................................ 12

7.1.1. Anchor components .................................................................................................................... 12

7.1.2. Anchor-specific components and corrosion protection system ..................................................... 12

7.2. Anchor tests ............................................................................................................................... 12

1. General Information

The subject of the approval comprises ground anchors with supporting elements made of prestressing

steel strands that comply with the requirements of ÖNORM EN 1537.

Ground anchors must only be planned, dimensioned, installed, tested and monitored by companies with

corresponding technical expertise, experience and appropriately trained specialist personnel.

Ground anchors constitute critical components under ÖNORM EN 1997-1, which means that they have to be regularly inspected during their useful life and that this inspection has to be defined in the plans.

The type and minimum scope of the maintenance requirements are specified in the standard.

The responsibilities for planning, dimensioning, installation, testing and monitoring ground anchors for construction projects must be contractually agreed upon. The anchor system, anchor manufacture and

installation must be appropriately documented and recorded.

The manufacturer of the post-tensioning system, the anchor components and the corrosion protection system is responsible for their conformity with the approval criteria.

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2. Reference Standards

ÖNORM EN 1537: 2015 Execution of special geotechnical works - Ground anchors

ÖNORM EN ISO 22477-5: 2016 Geotechnical investigation and testing - Testing of

geotechnical structures - Part 5: Testing of ground anchors

ÖNORM EN 1990: 2013 Eurocode - Basis of structural design

ÖNORM EN 1997-1: 2014 Eurocode 7 – Design, calculation and dimensioning of geotechnological works – Part 1: General regulations ÖNORM B 1997-1-1: 2013 Eurocode 7 – Design, calculation and dimensioning of

geotechnological works – Part 1: General rules – National specifications concerning ÖNORM EN 1997-1 and national supplements

ÖNORM EN 1992-1-1: 2015 Eurocode 2: Design of concrete structures – Part 1-1: General rules and rules for buildings

ÖNORM B 4707: 2017 Steel For The Reinforcement Of Concrete – Requirements, Classification And Proof Of Conformity

ÖNORM B 4758: 2014 Prestressing Steel - Requirements, Classification And a Conformity Assessment

ETAG 013:2002 Guideline for European Technical Approval of Post-Tensioning

Kits for prestressing of structures

EAD 160004-00-0301:2016 Post-Tensioning Kits for prestressing of structures

ÖNORM EN 445: 2008 Grout for prestressing tendons – Test methods ÖNORM EN 446: 2008 Grout for prestressing tendons - Grouting procedures

ÖNORM EN 447: 2017 Grout for prestressing tendons - Basic requirements

ÖNORM EN 206: 2017 Concrete – Specification, performance, production and conformity

ÖNORM EN ISO 683-1:2018 Heat-treatable steels, alloy steels and free-cutting steels – Part 1:

Non-alloy steels for quenching and tempering

ÖNORM EN 10025-2:2005 Hot rolled products of structural steels – Part 2: Technical

delivery conditions for non-alloy structural steels

DIN 16776:2016 Resilient floor coverings - Heterogeneous polyurethane floor coverings – Specification

ÖNORM EN 10217-1:2017 Welded steel tubes for pressure purposes – Technical delivery

conditions – Part 1: Electric welded and submerged arc welded

non-alloy steel tubes with specified room temperature properties

ÖNORM EN 1563:2012 Founding – Spheroidal graphite cast irons

ASTM D5989 Standard Specification for Extruded and Monomer Cast Shape Made from Nylon (PA)

DIN 8061:2016 Unplasticized polyvinyl chloride (PVC-U) pipes –

General quality requirements, testing

DIN 8062:2009 Unplasticized polyvinyl chloride (PVC-U) pipes – Dimensions

ÖNORM EN ISO 3126 Plastics piping systems – Plastics components –

Determination of dimensions

ÖNORM EN ISO 9001: 2015 Quality Management Systems – Requirements

RVS 08.22.01:2013 Grouted anchors, grouted anchors under tensile stress and nails

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3. Description of the Ground Anchor

The DYWIDAG Strand Anchor is produced with 2 to 15 seven-wire prestressing steel strands in

accordance with ÖNORM B 4758 of the following types:

- Y 1770S7 – 15.3 mm and 15.7 mm (cross section 140 mm² and 150 mm²)


The suitability of the prestressing steel strand has to be verified by means of an approval certificate

verifying compliance with the characteristics set out in ÖNORM B4758.

The anchors produced according the requirements of ÖNORM EN 1537:

- Temporary strand anchors with individually sheathed strands in the unbonded length and PE transition tubes in the area of the anchor head.

- Temporary anchors for extended short-term use or for aggressive soil conditions and higher

corrosion protection requirements with monostrands in the unbonded length and PE transition tubes in the area of the anchor head

- Permanent strand anchor or adjustable permanent anchor with monostrands in the unbonded

length and corrugated PE sheathing over the entire length of the anchor. The corrugated PE

sheathing is sealed off from the steel pipe welded to the anchor plate in the area of the anchor head.

- Staggered anchors with staggered anchor length for use as a temporary or permanent strand

anchor designed as already described.

The wedge plates of the following systems are used for the anchor head:

Number of strands

Tendon Anchor type

2-4 E6-4 Plate anchorage

in accordance with ETA-13/0839 SUSPA tensioning system

5-7 6807 MA multiplane anchorages in accordance with ETA-13/0815

DYWIDAG Tensioning System 8-9 6809

10-12 6812

13-15 6815

The use of the wedge plates of the multiplane anchorage with an anchor plate is based on the DSI Group's

SUSPA tensioning system. This includes verification of the wedge plate requirements for an external

tendon in accordance with EAD 160004-00-0301 (formerly ETAG

013).

The requirements for tendons and anchorages are specified in ÖNORM EN 1992-1-1. According to

ÖNORM EN 1537, the ground anchor’s anchor head has to satisfy the requirements of the verification

procedure of EAD 160004-00-0301. The verification is provided as part of the ETA for the tensioning system.

The anchor head comprises a wedge plate that is centrally aligned on top of a square or round anchor

plate. The anchor plate will hereinafter be referred to as the anchor plate. The wedge plate and the anchor

plate are dimensioned for the maximum load bearing capacity of a Y 1860S7 - 15.7 mm (cross section 150 mm²) prestressing steel strand. Anchors with 15.3 mm and 15.7 mm-diameter strands are used with

different anchor wedges.

There are also wedge plates with a trapezoidal external thread for adjustable permanent anchors

specifically for use in geotechnics. These wedge plates have a slightly larger diameter and are higher

than those of the present system, which means that they comply with the requirements of EAD 160004-

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00-0301. The centering method for the two systems is the same. The wedge plate can be lifted with the

aid of a special lifting device. The following wedge plates with trapezoidal external threads are being used:

Number of strands

Tendon Anchor type

2-4 E6-4 E6-4-TR

5-7 6807 6807-TR

8-9 6809 6809-TR

10-12 6812 6812-TR

13-15 6815 6815-TR

The anchor plate has been adapted to the cavity for the anchor and is larger than specified in the ETA. The anchor plates in use are square and round. The diameter of the round anchor plates corresponds to about

1.15 of the side lengths of the square plate. The anchor plates have the same thickness.

In temporary strand basanchors, every prestressing steel strand in the unbonded length is encased in its own sheath. The other anchor types use strands encased in PE sheaths filled with corrosion protection

compound with zero-voids (monostrands).

The PE sheaths have a minimum thickness of 1.0 mm. They are designed on the basis of the requirements

for monostrands in accordance with EAD 160004-00-0301 and the specifications of ÖNORM EN 1537. In

temporary anchors, the PE sheath forms the unbonded steel length and is designed to protect the strand from mechanical damage during manipulation, installation and when the anchor is tensioned.

The friction of the PE sheath and strand is ≤ 60 N/m. This is based on the requirements for monostrands in

accordance with EAD 160004-00-0301. These requirements are met if the quantity of corrosion protection compound amounts to ≥ 40 g/m. It is permissible for this value to be lower provided the filling has zero

voids and the friction force is ≤ 60 N/m.

The monostrands are manufactured in accordance with the DSI CPS process (corrosion protection sheath)

in the Königsbrunn facility. The corrosion protection compound meets the specifications of ÖNORM EN

1537. Alternatively, the use of conventional monostrands is also possible, provided that the compliance of

the corrosion protection system with EAD 160004-00-0301 is verified. The anchor head must be filled with corrosion protection compound as specified in Annex 12.

In temporary strand anchors, the individual sheaths of the prestressing steel strand or monostrand in the unbonded length are sealed off with PE transition tubes that are connected to the wedge plate.

Permanent strand anchors feature a steel pipe that is tightly welded to the anchor plate. The steel pipe seals off the corrugated PE sheathing around the monostrands in the unbonded steel length by means of a

sealing ring. The corrugated PE sheathing encases the anchor over its entire length including the

anchorage length. The thickness of the corrugated PE sheathing is determined on the basis of the internal

diameter set out in ÖNORM EN 1537.

The transition between the anchor head and unbonded steel length in temporary and permanent strand

anchors is designed in accordance with the specifications of ÖNORM EN 1537.

The strand anchor is designed for insertion into a pre-drilled borehole. The anchorage length is centered

inside the borehole using spacers and bonded to the ground by grout. In permanent strand anchors with corrugated PE sheathing over the entire length of the anchor, the unbonded steel length inside and outside

of the corrugated PE sheathing is also filled with cement mortar.

Staggered anchors are used for soft soils or substrates comprising different layers. In these anchors, the anchorage lengths of the individual strands are staggered over the entire anchorage length of the anchor.

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Forces are not transmitted into the ground at a single point, but through a number of individual anchors

staggered over the anchorage length. This makes it possible to better utilise the existing shear stress of the ground.

The corrosion protection system of the DYWIDAG Strand Anchor designed according to ÖNORM EN

1537 are intended for the following areas of application:

- Temporary strand anchors with a planned service life of up to 2 years

- Temporary strand anchors for extended short-term use with a planned service life of more

than 2 and up to 7 years

- Permanent strand anchors designed for permanent use with a planned service life of more

than 2 years

The following annexes contain detailed information on the DYWIDAG Strand Anchor System:

Annex 1: Temporary strand anchors and temporary strand anchors for extended short-term use, anchor head details and details about corrosion protection

Annex 2: Permanent strand anchor, anchor head design, details about corrosion

protection

Annex 3: Permanent strand anchor with staggered anchor length

Annex 4 and 5: Anchor load bearing capacity material properties and maximum test forces in accordance with ÖNORM B 1997-1-1

Annex 6: Char. anchor load bearing capacity and rated values for the anchor load bearing

capacity based on damage categories in accordance with ÖNORM B 1997-1-1 Annex 7: Anchor head details, centre and edge distance

Annex 8 to 13: Components with dimensions and material

Annex 14: Assembly instructions for temporary strand anchors and temporary strand anchors for extended short-term use

Annex 15: Assembly instructions for permanent strand anchors and staggered anchors

Annex 16: Installation instructions for temporary strand anchors and temporary strand

anchors for extended short-term use Annex 17 and 18: Installation instructions for permanent strand anchors and assembly

instructions for anchor heads

Annex 19: Tensioning a strand anchor, retensioning and checking the anchor force

4. Scope of Application

Ground anchors with tendons made of seven wire prestressing steel strands are ground support elements

that transfer an applied force to a load-bearing layer in the ground in accordance with the principles for

the execution of geotechnical works. The ground can be soil as well as rock.

ÖNORM EN 1537 is an application standard and contains information on the execution of anchor works,

geotechnical testing, construction materials and products and the installation, testing and monitoring of

ground anchors. The annex of this standard contains details about the material properties of the corrosion

protection compounds used to build anchors and on the design of corrosion protection for temporary and permanent anchors.

The anchor tests must be performed in accordance with ÖNORM EN ISO 22577-5 (draft).

The principles for the dimensioning concept for structures in accordance with the limit state of the external load bearing capacity are specified in ÖNORM EN 1990. The associated ground conditions

have to be determined according to ÖNORM EN 1997-1.

The ground anchor’s dimensioning values for the limit state of the internal load bearing capacity are

defined in ÖNORM B 1997-1-1 and their load bearing capacity is specified on the basis of damage

categories. This standard specifies the national parameters for ÖNORM EN 1997-1 and is to be applied

together with the same.

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5. Construction Materials and Products

5.1. Tendon

5.1.1. Steel tendon characteristics

The tendons used comprise 2 - 15 seven-wire prestressing steel strands in accordance with ÖNORM

B4758 of the following types:



The suitability of the prestressing steel strand has to be verified by means of an approval certificate

verifying compliance with the characteristics set out in ÖNORM B 4758.

Annexes 1 to 3 contain system drawings that show the structure of DYWIDAG Strand Anchors.

5.1.2. Anchor load bearing capacity requirements

The strand anchor’s tensile capacity has an efficiency of 95% in relation to the characteristic breaking

force of the tendon in accordance with the requirements of EAD 160004-00-0301 on tensioning

procedures.

Annexes 4 and 5 list the material characteristics of the load bearing capacity of the anchor and maximum

permissible test forces for the designated types of seven-wire prestressing strands in accordance with

ÖNORM B 1997-1-1.

Annex 6 contains the rated values for the anchor’s load bearing capacity in accordance with damage

categories CC1, CC2 and CC3 in accordance with ÖNORM B 1997-1-1.

The required test forces against pulling out the anchor have to be determined on the basis of the external

load bearing capacity and with a partial safety factor for the individual damage categories in accordance

with ÖNORM B 1997-1-1 for all design situations. When doing so, the maximum test forces must not be exceeded.

The fatigue strength of the strand anchor verified in accordance with the requirement of ETAG 013, is

80 N/mm².

5.2. Anchor head

5.2.1. Anchor head design

The anchor head is composed of elements from the DYWIDAG/SUSPA Strand Tensioning System. The

wedge plate and the anchor wedges are components of the ETA. The square or round anchor plate is larger than specified in the ETA. The anchor plate has been dimensioned in accordance with the

maximum load-bearing capacity of the system. The square and round anchor plate is made of the same

material.

In temporary strand anchors, the prestressing steel strands with individual PE sheaths or monostrands

with PE transition tubes are connected to the wedge plate.

The force can be regulated by retensioning or releasing tension through the protruding strands or a lifting

device in the case of wedge plates with trapezoidal external thread by using two-component wedge rings between the wedge and the anchor plate. Permanent anchors in particular are designed to be lifted by the

wedge plate with trapezoidal external thread.

Permanent strand anchors feature a cylindrical steel pipe that is tightly welded to the anchor plate. The

corrugated PE sheathing that covers the monostrands in the unbonded steel length is sealed off from the

steel pipe with a sealing ring.

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The anchor plate has to be perpendicular to the tendon centre. Any deviations in the angle have to be

compensated for with a substructure. The tensioning system allows for a maximum deviation of up to 3° of the tendon’s perpendicularity relative to the anchor head.

Annex 7 contains a schematic drawing of the anchor head.

Annexes 8 to 13 contain information on the components of the anchor head and the corrosion protection

system including dimensions and material specifications.

5.2.2. Load transfer to the supporting structure

In the strand tensioning system used as a basis, the anchor head transfers the load to the supporting

structure via a concrete body with splitting reinforcement (helical and additional reinforcement). The dimensions have to be established on the basis of the requirements set out in ETAG 013 for the maximum

load bearing capacity of a system with Y 1860S7 – 15.7 mm (cross section 150 mm²) prestressing steel

strands. With the following parameters, an efficiency of 130% is maintained in respect of the characteristic breaking force of the tension member:

- Concrete compressive strength at the time of prestressing fcm,0, cube 150 ≥ 25 N/mm² - Minimum concrete quality ≥ C 25/30 in accordance with ÖNORM EN 206

In systems without reinforcements, the centre and edge distances have to be newly calculated, increased

relative to those of reinforced strand tensioning systems and the concrete quality upgraded from C25/30 to ≥ C 30/37. Annex 7 lists the centre and edge distances of anchor systems with structural reinforcement

(50kg/ m³ concrete), but without additional reinforcement (splitting reinforcement).

5.3. Grouting mortar

All installed strand tendons with and without corrosion protection sheaths in the anchorage length are covered with a minimum external layer of cement mortar of 10 mm that reaches right up to borehole

wall. The tendons are centered with spacers. The cement mortar used to form the grout body has to fulfill

the requirements of ÖNORM EN 1537.

When choosing the cement for the grout body that is in contact with the foundation soil, the impact of the soil conditions in accordance with the ÖNORM EN 206 exposure classes has to be taken into

consideration.

The permanent strand anchor is constructed with corrugated PE sheathing over its entire anchor length. The anchorage length contains an internal cement mortar layer between the corrugated PE sheathing and

the strand of at least 5 mm. The bundled strand tendon is centered with the aid of a cord or spacer. The

cement mortar used must comply with the standards ÖNORM EN 445, ÖNORM EN 446 and ÖNORM EN 447.

5.4. Corrosion protection

ÖNORM EN 1537 contains examples for the design of corrosion protection systems for temporary and

permanent strand anchors. It also sets out the requirements for a temporary anchor used for extended short-term periods or in aggressive soil conditions.

The present anchor systems comply with the specified corrosion protection principles of this standard.

The corrosion protection system, with the exception of the grout, is applied in the factory.

The structure of the corrosion protection is described schematically below. Annexes 8 to 13 contain

information on the anchor head and corrosion protection system components including dimensions and

material specifications.

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5.4.1. Temporary strand anchor

Annex 1 contains a schematic drawing of the temporary strand anchor with detailed information on the

corrosion protection. The essential corrosion protection components are:

Anchorage length: The strand bundle is covered with a ≥ 10 mm layer of cement mortar that

reaches right up to the borehole wall. The strands are bundled (steel band) and

centered inside the borehole with spacers.

Unbonded steel length: Each individual strand is encased in a smooth PE tube with ≥ 1.0 mm thick walls and sealed with PE adhesive tape or heat-shrink tubing at their end to

protect them against water ingress.

Anchor head: PE transition tubes are connected to the holes of the wedge plate which overlap the PE sheaths of the individual strands (monostrands). If anchor heads are

accessible, a coating with corrosion protection compound or covering with

corrosion protection tape must be provided. If anchor heads are inaccessible, a metal or plastic cap is attached to the anchor plate.

5.4.2. Temporary strand anchor for extended short-term use

Annex 1 contains a schematic drawing of a temporary strand anchor for extended short-term use with detailed information on the corrosion protection. The essential corrosion protection components are:

Anchorage length: The strand bundle is covered with a ≥ 10 mm layer of cement mortar that reaches right up to the borehole wall. The strands are bundled (steel band) and

centered inside the borehole with spacers.

Unbonded steel length: Monostrands encased in a smooth PE tube with ≥ 1.0 mm thick walls and sealed

with PE adhesive tape or heat-shrink tubing at their ends to protect them against water ingress.

Anchor head: PE transition tubes are connected to the holes of the wedge plate which overlap the PE sheaths of the individual strands (monostrands). The corrosion protection

comprises a metal or glass-fibre reinforced plastic cap, which is filled with

corrosion protection compound or the wedge plate, protruding strands and

anchor wedges must be wrapped with several layers of corrosion protection tape.

5.4.3. Permanent strand anchor

Annex 2 contains a schematic drawing of the permanent strand anchor with detailed information on the

corrosion protection. The essential corrosion protection components are:

Anchorage length: The strands are encased in corrugated PE sheathing with ≥ 1.0 mm or ≥ 1.5 mm

thick walls. They are distanced by a spacer or a cord, bundled (steel band) and

centered with the aid of spacers inside the corrugated PE sheathing. There is an internal ≥ 5 mm layer of cement mortar around the strand bundle.

The corrugated PE sheathing, which is encased in an external layer of cement

of ≥ 10 mm right up to the borehole wall, is centered by means of spacers. The

ground-side anchor end is sealed with an end cap.

Unbonded steel length: Monostrands encased in a ≥ 1.0 mm PE sheath and sealed off against the

anchorage length at the end with PE adhesive tape or heat-shrink tubing.

The corrugated PE sheathing around the anchorage length and its internal

cement mortar layers continues beyond the end of the anchorage length.

Anchor head: The steel sealing pipe welded to the anchor plate is sealed off from the

corrugated PE sheathing with a profile ring and is filled with corrosion

compound or cement mortar with zero voids after tensioning. In order to absorb

the lateral pressure, a steel ring is positioned in this area above the corrugated

PE sheathing.

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The anchor plate with the weld-on steel pipe is coated with a type of corrosion

protection appropriate for structural steel works or hot-dip galvanized.

Once the strand anchor has been tensioned, a coated or hot-dip galvanized metal or glass-fibre reinforced plastic cap is tightly attached to the anchor plate and

filled with corrosion protection compound. If anchors are inaccessible, the cap

can be filled with cement mortar or synthetic resin.

In adjustable anchors, the wedge plate, protruding strands and anchor wedges

must be wrapped in several layers of corrosion protection tape.

If the head is encased in concrete, there is no need for the cap and corrosion

protection tape. However, in that case it must be ensured that the anchor wedges are not being blocked.

5.4.4. Staggered anchors

Annex 3 contains a schematic drawing of a permanent strand anchor with staggered anchorage length.

Temporary strand anchors can also be set up as staggered anchors.

The PE sheaths around the individual strands already described above are extended into the anchor’s

anchorage length and are used to stagger the anchorage lengths of individual strands or groups of strands.

6. Installation

The installation of the strand anchor has to meet the requirements of RVS 08.22.01. Anchors can only

be installed if the anchor system’s suitability has been verified in a timely manner. All of the work, tests

and inspections have to be performed and records kept in accordance with the relevant execution and test standards.

With reference to ÖNORM EN 1997-1-1, the suitability of the anchor system for federal roads (A-roads)

can be verified by means of a BMVIT approval.

Annexes 15 to 19 contain the instructions for manufacturing the strand anchor corrosion protection at

the factory, and for handling and installing as well as tensioning the anchor.

It is pointed out that the anchorage lengths have to be partially pretensioned to a minimum of 35% of

the strands’ tensile strength after the strand anchor has been installed and once the grouting mortar has

sufficiently hardened. This is designed to create a strong bond between the anchor wedge and strand that will prevent the strand from sliding out.

The strand anchor must only be assembled and installed subject to compliance with the listed process

and installation instructions by personnel that has been verifiably (personal certificate) trained by the

approval holder and under the supervision of the local technical site supervision. The installation of the anchor head’s corrosion protection in particular must be monitored.

In accordance with ÖNORM B 1997-1-1 is intended for the maintenance of ground anchors:

• Visual inspection of all anchor heads every 2 to 3 years

• Annual reading of designated anchor head measuring devices

• Lift-off test every 5 to 10 years

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7. Tests

7.1. Material tests and proof of conformity

7.1.1. Anchor components

The production of the DYWIDAG Strand Tensioning System must be monitored in accordance with a

defined inspection plan according to ETA-13/0815 by the approval holder or manufacturer of the tensioning system.

The product has been awarded a certificate of conformity by an approved certification body.

The wedge plates with trapezoidal external threads must be inspected by the manufacturer of the

component in accordance with the same inspection plan specified in the ETA.

A documentation of the tests and monitoring carried out on the components used in the strand anchor

must be deposited with the manufacturer of the anchor.

7.1.2. Anchor-specific components and corrosion protection system

The manufacturer of the DYWIDAG Strand Anchor has to perform internal production tests in

accordance with EN ISO 9001. These tests refer to the components, which are not covered by the ETA and the production of the corrosion protection system.

The inspection has to be performed by an accredited inspection and monitoring body on the basis of a

supervisory contract that also specifies the scope of the internal production controls.

The supervisory contract has to be concluded between the approval holder and the accredited external

monitoring body. The inspection has to be performed at least once a year and refers to an inspection of

the manufacturer’s internal production tests and the performance of sampling inspections. The results have to be documented in a report.

7.2. Anchor tests

The anchors have to be load tested on the construction site in accordance with the requirements of

ÖNORM B 1997-1-1. The tests have to be documented. Afterwards, suitability tests shall be performed

on at least three structural anchors to verify the planning measures and to confirm the relevant design case.

The anchor tests shall be performed in accordance with ÖNORM EN ISO 22477-5 (draft). This specifies

the applicable test methods.

DYWIDAG Strand anchor

2 - 15 strand ø15.3 mm or 15.7 mm Temporary strand anchor and temporary strand anchor for extended

application, anchor head design, corrosion protection

Annex: 1

DYWIDAG Strand anchor 2 - 15 strands ø15.3 mm or 15.7 mm

Permanent strand anchor with staggered bond length

Annex: 2


2 - 15 strands ø15.3 mm or 15.7 mm

Permanent strand anchor with staggered bond length

Annex: 3



Prestressing steel strands Y1770S7 cross section 140 mm² and 150 mm²

Anchor capacity material properties and maximum test forces in

accordance with ÖNORM B 1997-1-1

Annex: 4

Rpk Rp0,1k Rk = Rp0.1k / γs1) 0.8 x Rpk 0.9 x Rp0.1k

[n] [kN] [kN] [kN]

2 496 436 379 397 392

3 744 654 569 595 589

4 992 872 758 794 785

5 1 240 1 090 948 992 981

6 1 488 1 308 1 137 1 190 1 177

7 1 736 1 526 1 327 1 389 1 373

8 1 984 1 744 1 517 1 587 1 570

9 2 232 1 962 1 706 1 786 1 766

10 2 480 2 180 1 896 1 984 1 962

11 2 728 2 398 2 085 2 182 2 158

12 2 976 2 616 2 275 2 381 2 354

13 3 224 2 834 2 464 2 579 2 551

14 3 472 3 052 2 654 2 778 2 747

15 3 720 3 270 2 843 2 976 2 943


[n] [kN] [kN] [kN]

2 532 468 407 426 421

3 798 702 610 638 632

4 1 064 936 814 851 842

5 1 330 1 170 1 017 1 064 1 053

6 1 596 1 404 1 221 1 277 1 264

7 1 862 1 638 1 424 1 490 1 474

8 2 128 1 872 1 628 1 702 1 685

9 2 394 2 106 1 831 1 915 1 895

10 2 660 2 340 2 035 2 128 2 106

11 2 926 2 574 2 238 2 341 2 317

12 3 192 2 808 2 442 2 554 2 527

13 3 458 3 042 2 645 2 766 2 738

14 3 724 3 276 2 849 2 979 2 948

15 3 990 3 510 3 052 3 192 3 159

[kN]

No. of

strands

No. of

strands

Y17700S7

∅15.7 mm, Rpk =266 kN, Rp0.1k = 234 kN, S0 = 150 mm²

Y1770S7


[kN]

Char. yield load at 0.1%

Char. yield load at 0.1% Char. design loadMax. proof load

Pp,max2)Char. ulitmate load

Char. ulitmate load Char. design loadMax. proof load

Pp,max2)

1) The maximum fixing force P0 must be P0 ≤ Pk, steel tendon partial safety factor γs = 1.15 in accordance with ÖNORM EN 1992-1-1 2) Anchor tendons must be dimensioned in such a way that the test forces specified for inspections, suitability and acceptance tests are not exceeded.

The lower value is decisive.



Prestressing steel strands Y18600S7 cross section 140 mm² and 150 mm²

Anchor capacity material properties and maximum test forces in

accordance with ÖNORM B 1997-1-1

Annex: 5


[n] [kN] [kN] [kN]

2 520 458 398 416 412

3 780 687 597 624 618

4 1 040 916 797 832 824

5 1 300 1 145 996 1 040 1 031

6 1 560 1 374 1 195 1 248 1 237

7 1 820 1 603 1 394 1 456 1 443

8 2 080 1 832 1 593 1 664 1 649

9 2 340 2 061 1 792 1 872 1 855

10 2 600 2 290 1 991 2 080 2 061

11 2 860 2 519 2 190 2 288 2 267

12 3 120 2 748 2 390 2 496 2 473

13 3 380 2 977 2 589 2 704 2 679

14 3 640 3 206 2 788 2 912 2 885

15 3 900 3 435 2 987 3 120 3 092


[n] [kN] [kN] [kN]

2 558 492 428 446 443

3 837 738 642 670 664

4 1 116 984 856 893 886

5 1 395 1 230 1 070 1 116 1 107

6 1 674 1 476 1 283 1 339 1 328

7 1 953 1 722 1 497 1 562 1 550

8 2 232 1 968 1 711 1 786 1 771

9 2 511 2 214 1 925 2 009 1 993

10 2 790 2 460 2 139 2 232 2 214

11 3 069 2 706 2 353 2 455 2 435

12 3 348 2 952 2 567 2 678 2 657

13 3 627 3 198 2 781 2 902 2 878

14 3 906 3 444 2 995 3 125 3 100

15 4 185 3 690 3 209 3 348 3 321

[kN]

No. of

strands

No. of

strands

Y18600S7


Y18600S7


[kN]

Char. yield load at

0.1%

Char. yield load at

0.1%Char. design load Max. proof load Pp,max

2)Char. ulitmate

load

Char. ulitmate

loadChar. design load Max. proof load Pp,max

2)

1) The maximum fixing force P0 must be P0 ≤ Pk, steel tendon partial safety factor γs = 1.15 in accordance with ÖNORM EN 1992-1-1

2) Anchor tendons must be dimensioned in such a way that the test forces specified for inspections, suitability and acceptance tests are not exceeded.

The lower value is decisive.



Prestressing steel strands Y1770S7 and Y1860S7

Cross section 140 mm² and 150 mm²

Design value of anchor capacity after consequences classes according to

ÖNORM B 1997-1-1

Annex: 6

CC1, CC2 η = 1.0 CC3, η = 1.15 CC1, CC2 η = 1.0 CC3, η = 1.15

[n] [kN] [kN] [kN] [kN] [kN] [kN]

2 379 379 330 407 407 354

3 569 569 495 610 531 531

4 758 758 659 814 708 708

5 948 948 824 1 017 885 885

6 1 137 1 137 989 1 221 1 062 1 062

7 1 327 1 327 1 154 1 424 1 239 1 239

8 1 517 1 517 1 319 1 628 1 416 1 416

9 1 706 1 706 1 484 1 831 1 592 1 592

10 1 896 1 896 1 648 2 035 1 769 1 769

11 2 085 2 085 1 813 2 238 1 946 1 946

12 2 275 2 275 1 978 2 442 2 123 2 123

13 2 464 2 464 2 143 2 645 2 300 2 300

14 2 654 2 654 2 308 2 849 2 477 2 477

15 2 843 2 843 2 473 3 052 2 654 2 654

CC1, CC2 η = 1.0 CC3, η = 1.15 CC1, CC2 η = 1.0 CC3, η = 1.15

[n] [kN] [kN] [kN] [kN] [kN] [kN]

2 398 398 346 428 428 372

3 597 597 519 642 642 558

4 797 797 693 856 856 744

5 996 996 866 1 070 1 070 930

6 1 195 1 195 1 039 1 283 1 283 1 116

7 1 394 1 394 1 212 1 497 1 497 1 302

8 1 593 1 593 1 385 1 711 1 711 1 488

9 1 792 1 792 1 558 1 925 1 925 1 674

10 1 991 1 991 1 732 2 139 2 139 1 860

11 2 190 2 190 1 905 2 353 2 353 2 046

12 2 390 2 390 2 078 2 567 2 567 2 232

13 2 589 2 589 2 251 2 781 2 781 2 418

14 2 788 2 788 2 424 2 995 2 995 2 604

15 2 987 2 987 2 597 3 209 3 209 2 790

No. of

strands

Y1770S7

∅15.3 mm, Rpk =248 kN, Rp0.1k = 218 kN, S0 = 140 mm² ∅15.7 mm, Rpk =266 kN, Rp0.1k = 234 kN, S0 = 150 mm²

Char. design

load

Design value of anchor capacity after

consequences classes

Char.

Ankertrag-

fähigkeit



Rk = Rp0.1k / γs

Rt,d = Rp0.1k / (γs x η)1)

Rk = Rp0.1k / γs

Rt,d = Rp0.1k / (γs x η)1)

No. of

strands

Y1860S7

∅15.3 mm, Rpk =260 kN, Rp0.1k = 229 kN, S0 = 140 mm² ∅15.7 mm, Rpk =279 kN, Rp0.1k = 246 kN, S0 = 150 mm²

Char. design

load



Char.

Ankertrag-

fähigkeit



Rk = Rp0.1k / γs

Rt,d = Rp0.1k / (γs x η)1)

Rk = Rp0.1k / γs

Rt,d = Rp0.1k / (γs x η)1)

1) Stahlzugglied γs = 1,15 gemäß ÖNORM EN 1992-1-1, Faktor η in Abhängigkeit von den Schadensfolgeklassen gemäß ÖNORM B 1997-1-1


Anchor head, centre and edge distance

Annex: 7

Anchor head details

No. of strands 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Anchor plate,

square

a [mm] 200 230 260 295 330 380

h [mm] 30 35 40 50 55

Ø [mm] 75 100 115 130 150

Anchor plate,

round

Øa [mm] 225 260 290 330 370 430

h [mm] 30 35 40 50 55

Ø [mm] 75 100 115 130 150

Recess plate Øi x t [mm] 125 x

3.2

160 x

3.6

160 x

3.6

200 x

4.5 200 x 4.5 200 x 4.5

Centre distance*) A [mm] 365 490 560 700 790 1050

Edge distance*) R [mm] 205 265 300 370 415 545

*) with structural reinforcement of least 50 [kg/m³] concrete according to ETAG 013, but without additional reinforcement (splitting tensile

reinforcement), concrete grade C30/37

c …. concrete cover over the constructive reinforcement in accordance with national requirements and, if necessary, the exposure classes in accordance with ÖNORM EN 206

Anchor head design

Annex 6 to 8 contain detailed information of the components.

Constructive reinforcement


Components with dimensions and material specifications

Annex: 8

Wedge plate Retensionable wedge plate

Material: C45 E+TN, ÖNORM EN ISO 683-1 Material: C45 E+TN, ÖNORM EN ISO 683-1

No. of

strands

Wedge plate Retensionable wedge plate

H

[mm]

D1

[mm]

D2

[mm]

D3

[mm]

Tk

[mm]

h

[mm]

d1

[mm]

d2

[mm]

d3

[mm]

Tk

[mm]

2-4 55 110 88 71 50 55 TR115x6 88 71 50

5-7 60 130 108 96 70 60 TR135x6 108 96 70

8-9 60 145 124 112 86 60 TR150x6 124 112 86

10-12 65 170 144 128 40/105 65 TR175x6 144 128 40/105

13-15 70 190 164 148 60/125 70 TR193x6 64 148 60/125

Anchor wedge

Material: C22, ÖNORM EN ISO 683-1

Strand diameter

[mm]

D

[mm]

L

[mm]

15.3 29 42

15.7 29 45



Annex: 9

Anchor plate, square

No. of

strands

□a

[mm]

h

[mm]

Ø

[mm]

Protection cap made of

metal plastic

Tk [mm]

No. of boreholes

Tk [mm]

No. of boreholes

2 200 30

75 166

4

170

3

3

4 230 35

5

100 186

206

6 260 40

7

8 295

50

115 201 9

10

330 130 226 250 11

12

13

380 55 150 246 282 14

15

Material: S355JR, ÖNORM EN 10025-2

Anchor plate, round


No. of

strands

∅a

[mm]

h

[mm]

Ø

[mm]


metal metal

Tk

[mm]

No. of

boreholes

Tk

[mm]

No. of

boreholes

2 225 30

75 166

4

170

3

3

4 260 35

5

100 186

206

6 290 40

7

8 330

50

115 201 9

10

370 130 226 250 11

12

13

430 55 150 246 282 14

15

Two-component wedge ring

No. of

strands

h

[mm]

Da

[mm]

Di

[mm]

2-4

20 / 30 / 40

114.3 79.3

5-7 139.7 99.7

8-9 159.0 114.6

10-12 177.8 133.4

13-15 193.7 153.7




Annex: 10

Anchor plate with tightly welded tube for permanent strand anchor


No. of

strands

a

[mm] ∅a

[mm]

h

[mm]

Ø

[mm]

L

[mm]

S

[mm]

D

[mm]


metal plastic

Tk

[mm]

No. of

boreholes

Tk

[mm]

No. of

boreholes

2 200 225 30

75

400

2.9 88.9 166

4

170

3

3

4 230 260 35

5

100 3.2 114.3 186

206

6 260 290 40

7

8 295 330

50

115

500

3.2 127 201 9

10

330 370 130 3.6 139.7 226 250 11

12

13

380 430 55 150 4.0 152.4 246 282 14

15

PE corrugated sheathing

Material: DIN 16776 PE-HD

No. of

strands

Di

[mm]

Da

[mm]

s

[mm]

2-4 54,3 63,9 1,0

5-7 68,3 78,3 1,0

8-12 87,0 97,5 1,5

13-15 106,0 125,0 1,5

No. of

strands

Ø x s

[mm]

L

[mm]

2-4 70 x 2.6

50

5-7 88.9 x

2.9

8-12 108 x

2.9

13-15 139.7 x

4

Steel ring

Material: P235TR1,

gemäß ÖNORM EN 10217-1



Annex: 11

Protection steel cap

Material: S235JR, ÖNORM EN 10025-2 (left drawing) bzw. EN-GJS-400-15, ÖNORM EN 1563 (right drawing)

No. of strands

hi,min*) Øi Tk s

[mm] [mm] [mm] [mm]

2-4 75 120 166

3.0

5-7 80

140 186

8-9 155 201

10-12 85 180 226

13-15 90 200 246

*) hi, min must be adjusted to the protruding strands

Protection plastic cap Material: Nylon 6 (Polyamid-6) filled with 20% glass fibres, ASTM D5989

No. of

strands

h

[mm]

D

[mm]

Tk

[mm]

s

[mm]

2-4 93 138 170 5

5-7 99 166 206 5

8-9

10-12 111 209 250 5

13-15 128 248 282 8



Annex: 12

Used corrosion protection compound:

Unigel 128F-1 (AS01) – Corrosion protection agent

Characteristic Standard Unit Criterion Flash point ISO 2592 [°C] > 220

Density ASTM D1475 [g/cm³] ~ 0.9

Dripping point ISO 2176 [°C] ≥ 190

Cone penetration ISO 2137 [dmm] 285

Viscosity at 25 °C CR Ramp 0-100 1/s [Pa s] 135

Oil separation at 40°C DIN 51817

nach 72 h: ~ 0% nach 7 d: ~ 0%

Oil separation at 80°C DIN 51817 nach 24 h: ≥ ~ 0%

Oxidation resistance DIN 51808 [MPa]

bei 100°C und 100 h: < 0.06 bei 100°C und 1000 h: < 0.2

Corrosion test (EMCOR) DIN 51802-SKF - 0-0

Aggressive substance content: Cl-, S2-, NO3x- SO42-

NFM07-023 [ppm] ≤ 50 (0.005%)

≤ 100 (0.010%)

Unigel 128F-1 (AS02) – Corrosion protection agent

Characteristic Standard Unit Criterion Flash point ISO 2592 [°C] > 220

Density ASTM D1475 [g/cm³] ~ 0.9

Dripping point ISO 2176 [°C] ≥ 190

Cone penetration ISO 2137 [dmm] 360

Viscosity at 25 °C CR Ramp 0-100 1/s [Pa s] 16.5

Oil separation at 40°C DIN 51817 nach 24 h: ≥ ~ 0%

Oil separation at 80°C DIN 51808 [MPa]

bei 100°C und 100 h: < 0.06 bei 100°C und 1000 h: < 0.2

Oxidation resistance DIN 51802-SKF - 0-0

Corrosion test (EMCOR) NFM07-023 [ppm]

≤ 50 (0.005%)

≤ 100 (0.010%)

Petro Plast – corrosion protection wax

Petro Plast

Flash point DIN 51 376 > 160

Density ISO 2811 ~ 0,9 g/cm3

Dripping point DIN 51 801 61 – 63 °C

specific flow resistance DIN 53 482 109 Ohm.cm

Neutralisation number DIN 51 558 < 1 mgKOH/g

Saponification number DIN 53 401 < 1 mgKOH/g

Rust protection – when subject to coastal salt fog: 5% NaCl – 168 h at 35 °C DIN 51 759 keine Korrosion

Long-term thermal stability 40 °C

Recommended injection temperature 90 – 120 °C

Colour Brown

Cleaning agent Cold cleaning agent

PE sheath and grease-filled strand friction < 60 N/m

Corrosion protection for the monostrands and around the anchor head:

Unigel, Petro Plast, Denso-Feu

Corrosion protection tape for covering the wedge plate:

DENSO®- Tape, KEBU




Annex: 13

Spacers (only in permanent anchors))

Material: PE-HD, DIN 16776, black

No. of.

strands ∅Tk

[mm]

∅

[mm]

2-4 25.8 52

5-7 40.8 67

8-12 59.8 86

13-15 71.0 99

Spacer

No. of.

strands

L

[mm]

Temporary anchor Permanent anchor

A

[mm]

d

[mm]

s

[mm]

A

[mm]

d

[mm]

s

[mm]

2-4 270

-

300

100 50 3 125 63 3,6

5-7 125 63 3,6 125 90 2,7

8-12 135 90 2,7 140 110 3,2

13-15 190 110 3,2 190 125 3,7

Material: PVC-U, DIN 8061 / 8062

Profile ring

Material: Silicone sponge (alternative: CR (NEOPRENE) 50 Shore A)

No. of.

strands ∅1

[mm]

∅2

[mm]

2-4 47 87

5-7 63 113

8-9 89 149

10-12

13-15 105 165

Monostrand sheating

Material: HDPE 80, ÖNORM EN ISO 3126

Litzen

Ø

[mm]

Außendurchmesser

[mm]

Wandstärke

[mm]

15,3 19,2 I 19,6 1,25

15,7 19,6 1,25

DYWIDAG - strand anchor 2 - 15 strands ø15.3 mm or 15.7 mm Assembly instructions for temporary strand anchors and temporary strand anchors for extended short-term use

Annex: 14

Assembly Instructions for DYWIDAG temporary anchors

- The strands of this anchor type are encased in individual sheaths in the unbonded length and left bare in

the anchorage length.

- On the unbonded length the bare strands are inserted into a sheath at the DSI manufacturing plant.

- The sheathed section has to be sealed off from the bare section with PE adhesive tape or a mini heat-

shrink tubing at the transition between the unbonded and anchorage length.

- The strands are bundled in the anchorage length in accordance with Annex 1 of the approval.

- Grout injection / post-grouting tubes can be fastened to the strand bundle.

- Once the anchors have been assembled, they can be coiled and transported to the construction

site on wooden reels or pallets.

Assembly instructions for DYWIDAG temporary strand

anchors for extended short-term use

- The strands of this anchor type are encased in individual sheaths, coated with corrosion protection compound in the unbonded length and left bare in the anchorage length.

- There are two possibilities for the production of the strands:

o The bare strands are coated with corrosion protection compound and sheathed over the

unbonded length at the DSI manufacturing plant.

o The manufacturer supplies a strand (monostrand) that has been coated with corrosion protection compound and sheathed and from which the sheaths and corrosion protection compound are removed in the anchorage length

- The sheathed section has to be sealed off from the bare section with PE adhesive tape or a mini heat-

shrink tubing at the transition between the unbonded and anchorage length.

- The strands are bundled in the anchorage length in accordance with Annex 1 of the approval.

- Grout injection / post-grouting tubes can be fastened to the strand bundle.



DYWIDAG - strand anchor 2 - 15 strands ø15.3 mm or 15.7 mm Assembly instructions for permanent and staggered strand anchors

Annex: 15

Assembly instructions for DYWIDAG permanent anchors

- The strands of this anchor type are encased in individual sheaths, coated with corrosion protection compound in the unbonded length and left bare in the anchorage length.

- There are two possibilities for the production of the strands:

o The bare strands are coated with corrosion protection compound and sheathed over the unbonded length at the DSI manufacturing plant.

o The manufacturer supplies a strand (monostrand) that has been coated with corrosion protection compound and sheathed and from which the sheaths and corrosion protection compound are removed in the anchorage length

- The sheathed section has to be sealed off from the bare section with PE adhesive tape or a mini heat- shrink tubing at the transition between the unbonded and anchorage length.

- The strands are bundled inside the anchorage length in accordance with Annex 2 of the approval and

must be covered with ≥ 5 mm cement inside the corrugated PE tube which can be achieved using a spacer or Ø6 mm PE cord.

- The grout injection tubes for the anchor’s interior and exterior must be attached to the strand bundle. -

The prepared strand bundle with the grout injection tubes must be pushed into the corrugated PE

sheathing.

- The end cap must be fitted to the corrugated PE sheathing and sealed. If the anchor’s exterior space

is to be injected with grout through an injection tube fed through the strand bundle, this injection tube has

to be fed through the cap.

- If the anchors are to be fitted with a post-grouting tube, this tube must be fitted to the outside of the

corrugated PE sheathing.



Assembly instructions for DYWIDAG staggered anchors

- Permanent strand anchors that are to be set up as staggered anchors are generally always built in the

same way as standard permanent anchors.

- The transition between the unbonded and anchorage length must be staggered in accordance with the project specifications (see Annex 3 for more information).

- The section with the individually sheathed strands has to be sealed off from the bare section

with PE adhesive tape or a mini heat-shrink tubing at the transition between the unbonded and anchorage

length in the same way as for standard permanent anchors.

- The downstream ends of the strands have to be marked in such a way that it is possible to ascertain the

individual strand’s unbonded lengths on site.

DYWIDAG - strand anchor 2 - 15 strands ø15.3 mm or 15.7 mm Installation instructions for temporary strand anchors and temporary strand anchors for extended short-term use

Annex: 16

Installation instructions for DYWIDAG temporary strand anchors and temporary strand

anchors for extended short-term use

- The borehole required for installation must be drilled in advance and must be clean and stable.

- The anchorage length of the strand bundle must be fitted with spacers to ensure that the anchor will

be centred inside the borehole.

- The strand anchor must be inserted into the borehole with a suspension hanger or by hand.

- The protruding strands (measured from the edge of the structure) have to be 1.0 - 1.5 m long

(depending on anchor type).

- It must be ensured that the anchor does not become damaged when being inserted into the pipe. If necessary, it is also possible to attach a drill nipple with flattened edges to the end of the

casing.

- The borehole must be filled with cement mortar in compliance with the requirements of ÖNORM EN 1537 either before or after the anchor has been installed starting from the bottom

of the borehole.

- The casings in the area of the anchorage length must then be removed and the borehole filled with more cement mortar to ensure that the entire anchorage length is filled with mortar. Once filled, the

remaining casings can be removed.

- It must be ensured that the borehole’s top 50 to 100 cm are not filled with cement mortar. If

necessary, this top section must be flushed to remove any cement mortar. Once the cement mortar has hardened, the PE sheaths around the individual strands must be removed starting just below the

structure’s edge. The strands must be protected from corrosion through the use of PE transition

tubes.

- Once attached, the anchor plate must be pushed onto the anchor.

- This must be followed by attaching the wedge plate and wedges. Once the anchor head has been

fully assembled and the cement mortar sufficiently hardened, the anchor can be tensioned. When

doing so, it must be ensured that the anchor head is centrally aligned and at the right angle relative to the anchor.

- Once tensioned, the protruding strands must be cut off approx. 15 mm above the wedges with a cut-

off wheel provided the strand anchor does not have to be post-tensioned. If it does have to be post-tensioned, the protruding strands have to be cut to size for the hydraulic bundle jack.

- If the anchors have to be post-tensioned, it must be ensured that the corrosion protection is

properly reapplied after post-tensioning.

- If the anchor heads of temporary anchors are accessible, they must be coated with corrosion protection compound, if inaccessible, they must be fitted with a protective cap.

- In temporary anchors for extended short-term use, this protective cap must then be bolted to the

anchor plate. The hollow space inside the protective cap must be filled with corrosion protection compound with zero voids through the cap opening. This opening must be sealed with a threaded

plug.

DYWIDAG - strand anchor 2 - 15 strands ø15.3 mm or 15.7 mm

Strand anchor installation and anchor head assembly instructions Annex: 17

Installation instructions for DYWIDAG permanent anchors

- The borehole required for installation must be drilled in advance and must be clean and stable.

- The anchorage length of the corrugated PE sheathing must be fitted with spacers to ensure that the anchor will be centred inside the borehole.

- The strand anchor must be inserted into the borehole with a suspension hanger or by hand.

- The protruding strands (measured from the edge of the structure) have to be 1.0 - 1.5 m long (depending on anchor type).

- It must be ensured that the anchor does not become damaged when being inserted into the pipe.If

necessary, it is also possible to attach a drill nipple with flattened edges to the end of the casing.

- The anchor’s interior has to be filled with grout using the hose that ends just above the end cap inside the inner annulus. The outer annulus must be filled with grout using the hose that is fed to the outside from the

inner annulus through the end cap or fitted on the outside.

- The anchor’s interior space must be filled with cement mortar first, followed by theanchor’s exterior space.

- The casing in the area of the anchorage length must then be removed and the outer annulus topped upwith

grout at high pressure. Once filled, the remaining casings can be removed.

- It must be ensured that the borehole’s top 50 to 100 cm are not filled with cement mortar. If necessary, this

top section must be flushed to remove any cement mortar.

- When the grouting mortar has hardened, the corrugated PE sheathing must be cut off below the edge of the

structure in such a way that it will subsequently end inside the pipe socket that will later be attached.

- The PE sheaths around the individual strands must now be removed starting just below the structure’s edge.

- Next, the anchor plate with the welded-on steel sealing pipe and ready-attached profile sealing ring must

be slid onto the corrugated PE sheathing.

- This must be followed by attaching the wedge plate and wedges. Once the anchor head has been fully assembled and the cement mortar sufficiently hardened, the anchor can be tensioned. When doing so, it

must be ensured that the anchor head is centrally aligned and at the right angle relative to the anchor.

- Once tensioned, the protruding strands must be cut off approx. 15 mm above the wedges with a cut-off wheel provided the strand anchor does not have to be post-tensioned. If it does have to be post-tensioned,

the protruding strands have to be cut to size for the hydraulic bundle jack.

- If the anchors have to be post-tensioned, it must be ensured that the corrosion protection is properly reapplied after post-tensioning.

- The remaining hollow space inside the pipe socket must now be filled with corrosion protection compound

or cement mortar with zero-voids through the hose that is fed through one of the holes in the wedges (if all

holes are filled with strands, through a hole in the wedge plate). Next, the protective cap (plus sealing ring) must be bolted to the anchor plate.

- The hollow space inside the protective cap must be filled with corrosion protection compound with zero

voids through the cap opening. This opening must be sealed with a threaded plug.

- Annex 18 contains drawings that illustrate how to assemble the permanent anchor head.


Anchor head assembly instruction

Annex: 18

DYWIDAG - strand anchor 2 - 15 strands ø15.3 mm or 15.7 mm Tensioning the strand anchor, posttensioning and checking the anchor force

Annex: 19

Tensioning DYWIDAG permanent anchors

- The anchors must be tensioned with a hydraulic bundle jack.

- The hydraulic bundle jack must be capable of tensioning the anchors up to the test force.

- Once the test force has been reached, the wedges have to be fixed in place in such a way that all

strands have the same amount of slack.

- The wedges’ slack has to be taken into account with respect to the lock-off load.

Tensioning DYWIDAG staggered anchors

Staggered anchors must be tensioned in the same way as described above.

However, it must be taken into account that the individual strands have

different unbonded lengths. The anchors can be tensioned in the following

ways: o Using individual jacks, so that every strand will be subject to the same amount of force at all times during

the tensioning process.

o Tensioning the strands with individual jacks up to an initial load in order to equalise the different unbonded lengths and subsequently fixing the strands in place with wedges and continuing the tensioning process with a hydraulic bundle jack.

o Tensioning the bundles with a hydraulic bundle jack and accepting that the individual strands will

have different tensions during tensioning.

o Using a hydraulic bundle jack and offsetting the pressing wedges in order to tension the strands up

to the same force in different ways.

Post-tensioning of anchors through the protruding strands

- Another method is to post-tension the anchors, which involves removing the anchor wedges and which must only be used if the clamping points of the anchor wedges created during the previous tensioning process

have moved further outwards by at least 15 mm after having been tensioned and have been

newly fixed in place.

- However, this post-tension method can only be used if the strands protruding beyond the wedge plate are sufficiently long.

- This method is used in particular in temporary anchors, where an anchor plate without trapezoidal external threads is usually used.

Post-tensioning anchors with wedge plates with trapezoidal external threads by means of a lifting

device

- This method involves using a stressing jack that is supported by a stressing chair located on the anchor plate.

- The stressing jack is used to lift the wedge plate off the anchor plate by means of a puller sleeve bolted to the trapezoidal external thread without loosening the anchor wedges.

- Once the required tensile elongation has been reached, a 2-component wedge ring of the same height as the tensile elongation between the anchor and anchor plate is inserted, which means that the post-

tensioning force is transmitted from the wedge plate to the anchor plate through the 2-component wedge

ring.

- If the anchors have to be post-tensioned, it must be ensured that the corrosion protection in the hollow areas of the pipe socket and protective cap is properly reapplied after post-tensioning.

DSI Underground Austria GmbH Alfred-Wagner-Strasse 1 4061 Pasching/Linz Austria

Phone +43-7229-61049-0 E-mail [email protected]

www.dsiunderground.at

Please note:This brochure serves basic information purposes only. Technical data and information provided herein shall be considered non-binding and may be subject to change without notice. We do not assume any liability for losses or damages attributed to the use of this technical data and any improper use of our products. Should you require further information on particular products, please do not hesitate to contact us.

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Documents

Retensionable DYWIDAG Strand Anchor - DSI Underground Austria · Declaration of Performance No. 18b-13/0815-DSI.MA-XX Y1770S7/Y1860S7-15.3/15.7 dated 19/12/2018 ETA-13/0839 Austrian