DYNA Force® Elasto-Magnetic Force Monitoring System

We do not only talk about service – we offer it!

As a service provider DSI offers professional support by experts and the training of installation Personnel on site.

Our goal is to fulfill your expectations day by day.

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Contents

Introduction .......................................................................................................................................................................................... 4

Fields of Application ............................................................................................................................................................................. 4

Key Features ......................................................................................................................................................................................... 4

System Description .............................................................................................................................................................................. 5Manual System for Single Anchors .................................................................................................................................................. 5Multiple Reading System ................................................................................................................................................................. 5Fully Automatic Reading System ..................................................................................................................................................... 5

System Components ............................................................................................................................................................................ 6

Technical Data ...................................................................................................................................................................................... 7DYNA Force® Sensor ....................................................................................................................................................................... 7Readout Unit .................................................................................................................................................................................... 7Multiplexer ....................................................................................................................................................................................... 7Cables .............................................................................................................................................................................................. 7System Accuracy ............................................................................................................................................................................. 7

DYNA Force® Sensors installed on DYWIDAG Anchors ....................................................................................................................... 8DYWIDAG Bar Anchors .................................................................................................................................................................... 8DYWIDAG Strand Anchors .............................................................................................................................................................. 8

Installation Process .............................................................................................................................................................................. 9

References ......................................................................................................................................................................................... 10

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Introduction

There is an increasing demand for health monitoring systems for geotechnical applications as well as for bridges and buildings. For the mentioned structures, steel elements that are, either prestressed or subject to high compression forces are key elements for achieving the scheduled performance of the structure. On many occasions during the construction and service life of a structure, it is of decisive importance to know the stress level / the axial forces of the steel elements in use. Although there are many methods to measure the axial force, most of them are cumbersome, expensive, and the accuracy varies depending on the method used. DSI actively participated in the development, testing and utilization of the DYNA Force® System for measuring the force in steel bars or strands.

The force measuring technique is based on the elasto-magnetic properties of ferromagnetic materials and is carried out using DYNA Force® Sensors. The magnetic permeability of steel in a magnetic field changes as a function of the mechanic normal stress condition of the steel. By measuring the relative change in magnetic permeability, the normal stress in the steel tendon can be determined. The DYNA Force® Monitoring System is based on the principle described above and can be used both for post-tensioned bars and for strands.

The hollow cylinder shaped monitoring sensors are available in different diameters to suit various bar and strand diameters.

A readout unit measures the magnetic permeability of the steel tendon through the sensor and shows the tendon force on the display. Each DYNA Force® Sensor is fitted with an integrated temperature sensor in order to automatically compensate the influence of possible temperature alterations.

The DYNA Force® System allows permanent monitoring of post-tensioning forces in steel tendons. Force readings as part of inspection procedures can be done within a few minutes without the need for lift-off equipment or other cost-intensive techniques.

Fields of Application

■ Ground Anchors ■ Tie-back and Tie-down Anchors ■ Micropiles

■ Soil Nails ■ Stay Cable Bridges ■ Post-Tensioning Tendons in Bridges and Buildings

■ Air Traffic Control Towers ■ Wind Energy Towers ■ Repair and Strengthening of Post-Tensioned Structures

■ Lifetime monitoring of the post-tensioning performance in structures

■ Knowledge that their post-tensioning design is working as intended. The system permits posterior analysis and potential adjustment at any time in the future

■ Monitoring of tendon forces at any time

■ Quality and support from the industry leading supplier ■ Sensors can either be mounted in the factory or on site ■ Typically, no extra work or interference with post-tensioning installation

■ No large load cell at anchorages and no increased pocket depth ■ Load check during stressing ■ Increased construction site safety ■ The electronic force readout is safe and reliable

Key Features

Readout Unit with Two Types of Sensors

For Contractors:

For Engineers:

For Owners:

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System Description

Manual System for Single Anchors

Key Features

■ Each DYNA Force® Sensor is individually connected to the readout unit

■ Force and temperature readings are realized sensor by sensor via the readout unit

■ Readings are recorded manually

Testing and Calibration of DYNA Force® Sensor Installation of DYNA Force® Sensor over Strand Anchor Bond Length

Fully Automatic Reading System

Key Features

■ Automatic readings of all connected sensors

■ Reading interval can be defined by the customer

■ Automatic force-time-chart and temperature-time chart for data analysis possible

■ Local data storage ■ Download and control option from a remotely located laptop via GSM or LAN network connection

■ Data can be imported to various programs for analysis

■ Possibility to integrate DYNA Force® with other measurement instruments (for example wind speed, pore water pressure, slope measurements,…) in standard software

Multiple Reading System

Key Features

■ All DYNA Force® Sensors are bundled and connected to the readout unit by multiplexers and main cables

■ Multiple readings of all sensors can be done from a central location with a single click

■ Local digital data storage ■ Data can be imported to various programs for analysis

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Automated System

Multiplexer Main Cable Readout Unit

Power Cord Enclosure (optional)

6-Pin Sensor or Extension Cable Connectors

12-Pin Main Cable Connectors

System Components

Overview

Essential System Parts Manual System for Single Anchors

Multiple Reading System

Fully Automatic Reading System

Readout Unit X X X

Sensors X X X

Multiplexers X X

Laptop/PC X X

Controller / Remote Box X

Extension Cables (for connecting the sensors with the multiplexers) X1) X X

Main Cables (for connecting the multiplexers with the readout unit) X X

AC(230V) or DC (24[V]) Power Cord3) X X X

RS232 Cable X X

PowerEM Software (for local access) X

GreenEye Software (for remote access) X

SimCard / Ethernet Network (provided by customer) X

Optional: Power Supply via 2x12[V] Batteries, Power Controller and Solar Panel

X2) X2) X2)

1) Depends on the accessibility of the sensor connectors on site

2) Just in case the usual AC or DC power supply is not available

3) Local power supply has to be provided by the customer

Readout Unit DYNA Force® Sensor Multiplexer

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Technical Data

DYNA Force® Sensor

Key Features

■ Sensor works touch-less and non-destructive

■ Every DYNA Force® Sensor includes a temperature sensor to take into account the temperature influence during force readings

■ Sensors and source material (strand/bar) are calibrated before shipping on site

■ Sensors are robust and have no moving parts. All inside connections are sealed with epoxy coating

■ Maximum cable distance between readout unit and DYNA Force® Sensor is 250m

■ Installation of sensors is either done during the production of the anchors or directly on the job-site before stressing the steel tendon

■ Operating temperature ■ -20[°C] up to +80[°C]

DYNA Force® Sensor Data

Type Steel Element Diameter Inner / Outer Diameter of Sensor Sensor Length Part Number

[mm] [mm] [mm]

Strand Tendon 15.3 - 15.7 20 / 36 132 DFS010101

Bar Tendon 16 - 36 43 / 80 180 DFS020101

Bar Tendon 40 - 47 53 / 99 200 DFS030101

Bar Tendon 50 - 63.5 73 / 145 310 DFS040101

Bar Tendon 75 85 / 155 330 DFS050101

Readout Unit

■ Measurement range ■ 0 – 95% yield stress level of the steel tendon

■ Power supply ■ AC: 90-246[V], 60/50[Hz], 300[W] ■ DC: 24[V], Peak 17A, Standby 200[mA]

■ Operating temperature ■ 0° up to 50 [°C]

■ Interface ■ RS232C

Multiplexer

■ Standard multiplexers ■ 8 or 16 Channels

■ Serial connection of a number of multiplexers via main cable possible

■ Additional standard enclosure in case of outside storage: painted steel or stainless steel available

Cables

■ Main cable ■ 12 contacts ■ Connector body

■ Nickel plated ■ PVC jacket

■ Extension cable ■ 6 contacts ■ Connector body

■ Plastic ■ PVC jacket

1 2 3 4 5 6 7

12,000

10,000

8,000

6,000

4,000

2,000

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Forc

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Loading Steps

0

14,000

Hydraulic Jack

DYNA Force®

Load Cell

System Accuracy

■ Tests have confirmed the high measuring accuracy of the DYNA Force® Sensors

■ The Diagram on the right shows the anchor force of a 59-0.6" strand anchor during different load levels

■ DYNA Force® Sensors correspond very closely to the jack readings during the loading stages

■ Throughout the testing, the DYNA Force® Sensors were consistently more accurate than the load cells

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DYNA Force® Sensors installed on DYWIDAG Anchors

DYWIDAG Bar Anchors

DYWIDAG Strand Anchors

Bearing Plate

DYNA Force® Connector

DYNA Force® Sensor DYNA Force® Sensor DYNA Force® Sensor

DYNA Force® Sensor

Cap Wedge Plate

Unbonded Anchor Length

Bonded Length

Nut

DYNA Force® Connector

Currogated Sheating

DYNA Force® Sensor DYNA Force® Sensor

Cap

Wedge Plate

Unbonded Anchor Length

Bonded Length

Spacer

DYWIDAG Prestressing Steel / GEWI® Threadbar

Grout Body

DYNA Force® Sensor

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Installation Process

Anchor with DYNA Force® Sensor

Stressing Anchor with Sensor Cable Installed and Connected Anchor

Multiplexer GreenEye PowerEM

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DYNA Force® System Premiere on Frankfurt’s Opera Square, Germany

Contractor Joint venture Spezialtiefbau Opernplatz, consisting of PST Spezialtiefbau Sued GmbH and DEMLER Spezialtiefbau GmbH & Co. KG, both Germany +++ Engineers IGG - Ingenieurgemeinschaft Grundbau GmbH, Germany (planning of excavation)

DSI Unit DYWIDAG-Systems International GmbH, BU Geotechnics, GermanyDSI Scope Production, supply, installation, test installation DYWIDAG Products 1,700 temporary Type 4-0.6" DYWIDAG Strand Anchors, 30 DYNA Force® Sensors, Readout Unit

Maximum Flexibility: DSI develops Restressable Anchor Heads for Choranche Dam, France

Owner EdF, France +++ General Contractor Eiffage, France +++ Subcontractor Résirep, France +++ Consulting Engineers EdF, France

DSI Unit DSI France SAS, France DSI Scope Development, production, supply, engineering services, technical support, supervisionDYWIDAG Products 8 Type 13-0.62" DYWIDAG Strand Anchors, 8 Type 22-0.62" DYWIDAG Strand Anchors, 4 DYNA Force® Sensors, 1 Readout Unit

References

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Dam, Trebinje, Bosnia and Herzegovina

Client GEOSONDA ZENICA BH +++ General Contractor GEOSONDA ZENICA BH +++ Subcontractor HISTEH D.O.O. +++ Consulting Engineers IBE Consulting Engineers Ljubljana Slovenia

DSI Unit DYWIDAG-Systems International GmbH, AustriaDSI Scope Production, supply, supervisionDYWIDAG Products Type 12-0.62" DYWIDAG Electricallly Testable Permanent Strand Anchors – EI-Iso System Length up to 61.5m

Sheet Pile Wall, Ile Seguin, Paris, France

Owner VNF, France +++ General Contractor EIFFAGE TP, France +++ Subcontractor SPIE FONDATIONS, France

DSI Unit DSI France SAS, FranceDSI Scope Production, supply, technical assistanceDYWIDAG Products 23 DYWIDAG Strand Anchors with 2 strands, 23 DYNA Force® Sensors

References

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V E N E Z U E L A

AustriaDYWIDAG-Systems International GmbH Alfred-Wagner-Strasse 1 4061 Pasching/Linz Austria Phone +43-7229-610 49 0 E-mail office@dywidag-systems.atwww.dywidag-systems.at

BelgiumDYWIDAG-Systems International N.V. Philipssite 5, bus 15 Ubicenter 3001 Leuven Belgium Phone +32-16-60 77 60 E-mail info.be@dywidag-systems.comwww.dywidag-systems.com/emea

FranceDSI France SAS Rue de la Craz Z.I. des Chartinières01120 DagneuxFrancePhone +33-4-78 79 27 82E-mail dsi.france@dywidag-systems.frwww.dywidag-systems.fr

GermanyDYWIDAG-Systems International GmbH Germanenstrasse 8 86343 Koenigsbrunn Germany Phone +49-8231-96 07 0 E-mail geotechnik@dywidag-systems.comwww.dywidag-systems.de

ItalyDYWIT S.P.A. Viale Europa 72 Strada A 7/9 20090 Cusago (MI) Italy Phone +39-02-901 65 71 E-mail info@dywit.itwww.dywit.it

NetherlandsDYWIDAG-Systems International B.V. Veilingweg 2 5301 KM Zaltbommel Netherlands Phone +31-418-57 89 22 E-mail email.nl@dywidag-systems.comwww.dywidag-systems.com/emea

PolandDYWIDAG-Systems International Sp. z o.o. ul. Bojowników o Wolnos´c´ i Demokracje˛ 38/121 41-506 ChorzówPolandPhone +48-32-241 09 98E-mail dsi-polska@dywidag-systems.comwww.dywidag-systems.pl

PortugalDYWIDAG SISTEMAS CONSTRUCTIVOS, SA Rua D. Manuel, n.º 24 A Quinta da Parreirinha 2695-003 Bobadela (Loures) Portugal Phone +351-21-892 28 90 E-mail dywidag@dywidag-sistemas.comwww.dywidag-sistemas.com

SpainDYWIDAG SISTEMAS CONSTRUCTIVOS, S.A. Avd/de la Industria, 4 Pol. Ind. la Cantuena 28947 Fuenlabrada (Madrid) Spain Phone +34-91-642 20 72 E-mail dywidag@dywidag-sistemas.comwww.dywidag-sistemas.com

United KingdomDYWIDAG-Systems International Ltd. Northfield Road Southam, Warwickshire, CV47 0FG Great Britain Phone +44-1926-81 39 80 E-mail sales@dywidag.co.ukwww.dywidag.co.uk

QatarDYWIDAG-Systems Middle East W.L.L. Al Thumama, new Compound, Street No 911, Villa no 56 - 17, Area no 46 E Ring road, Near to Electric Office P.O. Box 24893 Doha / Qatar Phone +974-44-58 04 11 E-mail info.qatar@dsi-middleeast.comwww.qacs.biz

www.dywidag-systems.com/emea

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.