TechTimes Newsletters...rebuilding the earthquake damaged pipes, roads, bridges and retaining walls in the city of Christchurch 2011 - 2016. This document has been provided as an example

Examples of the technical update newsletter which detailed SCIRT innovations.

Lessons learned from one of New Zealand’s most challenging civil engineering projects:

rebuilding the earthquake damaged pipes, roads, bridges and retaining walls in the city of

Christchurch 2011 - 2016.

This document has been provided as an example of a tool that might be useful for other organisations undertaking complex disaster recovery or infrastructure rebuild programmes.

For more information about this document, visit www.scirtlearninglegacy.org.nz

TechTimes Newsletters

Story: Technical Groups and Technical Newsletters

Theme: Design

http://www.scirtlearninglegacy.org.nz/

Technical Group Updates

Wastewater – Jeanette White

Innovations:

An innovations prioritisation matrix has been established and used

successfully to asses and prioritise innovations based on a number of

different criteria including cost, speed of implementation and frequen-

cy of use.

There are a number of innovations which have been assessed using

the matrix and have been moved forward to the research stage of the

innovation process including the following:

Vented manhole lids

Micro-tunnelling

Manhole cones

Vertical lateral risers

Restriction of long socket connections to specific design areas

Standard drawings, SS paper , guidelines and specifications:

Innovations which have been approved through Scope and Standards

include:

Pipe embedment options -SS 211

Plastic manhole chambers-SS 206

Changes to the pre-cast Circular manhole-SS 163

Refer the Scope and Standards folder on the general drive for more

information on these papers.

Specifications have been updated for CIPP lining and a pre-approval

process for Delivery Team lining sub-contractors is currently being de-

veloped .

Standard repair drawing formats and tables have been developed to-

gether with the Land Drainage technical group and 12 D/ CAD repre-

sentatives. These are currently being trailed within the Blue Team be-

fore a final version is disseminated SCIRT wide. Representatives form

the technical group visited Citycare last week to inspect standard re-

pair methods in order to produce a standard repair detail sheet.

Technical group representatives are currently working with Pump Sta-

tion representatives to complete at trafficable pump and vacuum

chamber lid detail .

Geotechnical- Louise Kendal Riches

Lessons Learnt:

Visit site frequently, especially if site supervisors change.

Look beyond our asset sites, especially for drainage issues.

Discussions on site may lead to confusion, follow up with an email

or sketch.

Standard drawings, SS papers, guidelines and specifications:

Scope and Standards paper SS217 which presented a decision mak-

ing tool to allow designers to adopt a design life of less than 100 years

for retaining walls in certain circumstances has been approved. De-

signer Guideline 51 relating to the design life of retaining wall also has

been approved and available on the Project Centre library

A Soil Nail Installation specification has been drafted and is

currently under review.

TechTimes Innovations and Technical groups

this issue

Updates from Technical groups

Innovation of the month-DD Drainage

Callaghan Innovations

Howard Simpson

Citycare site visit to inspect repair methods

Soil Nail wall installation

London Street Lyttelton

Testing accessibility of plastic manhole

chambers for CCTV cameras with Citycare

(Scope and Standards Paper 206)

Pump Stations-Patrick Marshall

Lessons Learnt:

PS Control Cabinet Issues-There have been a number of issues identi-

fied with the current design including :

Insufficient space around Radio unit to allow for connection to ra-

dio setup port etc.

Issues with the current aerial mounting bracket arrangement due

to pole diameter size, and corrosion of bolts when needing to un-

do. Suggested solution was to use a standard Hi-Tec aerial mount-

ing bracket

Hoon Hay pressure 01-

Delivery team failed to confer with SCIRT Designers and Pressure

Sewer supplier on the detail and understood the minimum cover

requirement in the berm to be more important than installing the

boundary kit boxes at an accessible depth. This resulted in the

majority of the 85 boundary boxes installed at 650mm depth with

the base of the EOne boundary kit box cut off, and a piece of 225

PVC used to extend the pit down to the lower depth. Lesson

learned was no to assume the Delivery Team Project Manager

will know to raise/query modifications with the Designers. Remind

the delivery teams that if they propose a detail, they need to run it

passed us first, to avoid rework

Innovations:

Currently investigating six different innovations which have been as-

signed to different members of the Technical Group

Standard drawings, SS papers, guidelines and specifications:

Six Standard Details have been completed and uploaded tot eh project

centre library. The Pressure Sewer Design Guide and Specification

have been updated and uploaded to Project Centre

Lift Station Design Guide is being undertaken by three members of the

group.

Land Drainage –Amber Murphy

Standard drawings, SS papers, guidelines and specifications;

Stormwater repairs and lining: Should be detailed using the same

standard plan and table as wastewater (see F:AutoCAD_Shared/

Prepared Details/Patch and Repair).

Stormwater pipe renewals/ new pipes: A shared roading and storm-

water plan and longsection sample drawing has been created (see

F:AutoCAD_Shared/Prepared Details/Roads). Where possible this

example should be followed. Some cases will require a separate

stormwater longsection (without plan, it will refer to the roading plan).

This may be relevant where there is not a singular underchannel pipe

only. If this is the case the stormwater longsection must match the

scale and direction of the roading plan. Obviously where stormwater

works are proposed on roads with no roading works, or through private

property, a separate stormwater plan and longsection will still be re-

quired.

Pipe Repair Toolbox:

A toolbox of pipe repair solutions is being developed. The additional

options (to a CIPP patch or partial renewal) may well be a more appro-

priate and cost effective solution in some situations (especially for the

stormwater pipes where exfiltration/infiltration is not of great concern).

It is envisioned that the toolbox will detail other options, and provide

guidance on where they will be appropriate.If you have seen/know of a

different repair method you think is of value, please contact Amber.

Innovations and Technical groups

Pump station control cabinet

Delivery Teams Innovations DD Drainage (sub-contractor to Downer) Dewatering Bins DD Drainage is installing LPS Tanks in New Brighton as a subcontrac-

tor to the SCIRT Downer DT. To treat sediments from dewatering, the

team designed a "multi bin treatment system" which consists in bins

connected to each other by recycled PVC fittings.

The system is cheap to build and maintain, efficient in treating sandy

soils and very mobile. If needed, further bins can be added in series to

improve discharge quality. Cost to build is less than $300.

Callaghan Innovation is a government organisation that works closely

with industry to provide knowledge and resources to promote innova-

tion. They have identified the Christchurch rebuild as one of the key

projects in New Zealand to be actively involved in and support. More

information about Callaghan can be found here:

http://www.callaghaninnovation.govt.nz/about-us and an insightful

presentation by Sir Paul Callaghan and his vision for New Zealand

here: http://www.youtube.com/watch?v=OhCAyIllnXY.

Ivo Gorny has been working alongside Annalise and Jeanette to un-

derstand the innovations process, identifying areas of improvement

and establishing an innovations business process to give direction and

support to the technical groups. We will be sharing and asking for your

feedback on this process in the next few weeks. Ivo brings many years

of experience with project management and business processes to

SCIRT and has been a great help acting an independent advisor to

innovations management.

Technical groups include representatives from all Deign teams and

also include Delivery team representatives.

If you would like an innovation, standard detail or common design is-

sue discussed please lodge and innovation on the Project Centre form

or talk to your technical representative.

Technical groups meet monthly or weekly. All meeting minutes can be

found in Project Centre Library, Innovations/technical group.

Callaghan Innovation

DD Drainage Dewatering Bins

operating onsite

Technical Groups

Wastewater –Jeanette White

Water reticulation -

Pump Stations-Patrick

Geotechnical—Louise Kendal Riches

Land Drainage– Amber Murphy

Structures-

http://www.callaghaninnovation.govt.nz/about-us

http://www.youtube.com/watch?v=OhCAyIllnXY



http://www.google.co.nz/url?sa=i&rct=j&q=&source=images&cd=&cad=rja&docid=k52-yRvry9z8YM&tbnid=68DxiM-2sqdmWM:&ved=0CAUQjRw&url=http://www.callaghaninnovation.govt.nz/&ei=u0PCUeKWDcLikAWR6oHYCw&bvm=bv.48175248,d.dGI&psig=AFQjCNFWZ0I5Yy-CMBRyeu_HyusTMkv70Q&ust

Technical Group Updates

• Wastewater – Jeanette White The new Asset Assessment Spreadsheet has been released for use by

all design teams (H:\General\Asset Assessment Spreadsheet\Asset As-

sessment Spreadsheet v3.1).This update has improved the process of

summarising pipe repair decisions and importing repairs into the 12d

drainage model. Standard repair tables are able to be produced from

the spreadsheet and AutoCAD script files allow repairs to be directly im-

ported into drawings. This automated process significantly reduces the

number of drawings required and time spent preparing them at the De-

tailed Design stage of each project. Additionally, direct links to CCTV

footage are provided to enable quick viewing and assessment of faults on

each pipe asset.

The finalised Version 3.2 and updated Design Guideline 046 will be

released this month after testing has been completed. Please refer to the

draft guideline in the same location as the spreadsheet for guidance on

how to use the new design tool. Alternatively, please consult with

Rosman Abdullah or Tessa Flaws for spreadsheet based queries or Neil

Locke and Brent Stewart for AutoCAD based queries.

A draft of the SCIRT standard pipe repair methods has been reviewed

by the Wastewater Technical group and is expected to be released

shortly.

A new trial automatic flush tank has been installed in Marley View

Street as part of SCIRT project 10398. This new tank replaced

an existing flush tank where the downstream pipe sections were not able

to be relayed to tractive force grades. Modelling and preliminary

field testing indicted a peak flushing flow produces a shear stress greater

than 1 Pa (tractive force shear stress) for 100m downstream of the tank.

Scope and Standards paper 234 (SS 234) was submitted and approved

for installation of three similar flush tanks in SCIRT project

11066.Modelling of theoretical hydrographs in Infoworks enabled the

shear stress values to be determined for the pipes downstream of the

proposed flush tanks.

The Wastewater Technical group will be monitoring the performance of

the installed flush tank in addition to investigating further potential use of

this innovation in other locations.

this issue Updates from Technical groups

Delivery Team smart innovations

Testing an automatic flush tank

installed in Marley View Street

Section detail of the

Automatic Flush Tank

TechTimes Innovations and Technical groups

• Geotechnical- Louise Kendal Riches

The site investigations team have recently carried out some investigations

using ground penetrating radar (GPR). However, it was discovered that

this method does not perform well in Loess soils. Loess absorbs the sig-

nals and therefore penetration to only 2m or less is typical.

The Orange team is preparing a document regarding wall aesthetics and

the desired finishes. This is as a result of a recent disappointment over

the final appearance of a gabion wall with a concrete capping beam. The

final wall has the top row of gabions covered by a partial and broken con-

crete face. As well as the poor appearance, this section is now less flexi-

ble and therefore attracts more load than the design anticipated. The pic-

ture (top right) is of a similar wall, also designed by SCIRT, with the finish

the designers were hoping for.

• Pump Stations-Patrick Marshall

The Lift Station Design Guideline draft is complete and

is being reviewed by members of the Pump Station technical group.

Four innovations are also being currently investigated.

A standard drawing for an access ladder to the valve chamber and the

wet well draft is complete and is being currently reviewed by Technical

Group members.

Pump Station Electrical Design

The electrical design for pump stations is currently being updated.

The Lead Designer for any station which is at the Detailed Design stage

should consult with their Pump Station Technical group representative or

Technical Lead before issuing drawings.


Pump station 105 Concept

Drawings

Gabion wall with concrete capping beam

Horotane Overpass Bridge

(temporary works) SCIRT project


• Land Drainage-Amber Murphy A pipe repair toolbox of alternative repairs for stormwater has been

created and these are currently being priced by the SCIRT estimation

team. These repairs include epoxy crack repair, installation of concrete

saddles and steel plates, a concrete surround of the existing pipe, con-

crete point joint ties, and relaying the existing pipe.

A standard detail for Rodding Inspection Chambers and Subsoil drains

is currently being developed within the Land Drainage technical group.

Standard rates for Concept and Detailed Design stormwater items has

been uploaded to Project Centre as part of a SCIRT Designer Guideline

055 (https://projectcentre.net/CHCH).

The “ Interpretation of SW requirements of the IRTSG” Designer Guide-

line 054 is also available in Project Centre.

• Structural-Campbell Apthorp

The introduction of the Structural Standards Notes (SC6201 Sheets 1-

5) has been introduced and needs to be specified with any structural

drawings. The new edition of the NZTA Bridge Manual was released in

May.

All Detailed Design after the 1st June 2013 should be abiding by the new

edition. There is also the push for more innovations to be logged and

progressed within the Structural technical group.

• Water reticulation-Sebastian Ichim

In the last couple of meetings the water group has developed a SCIRT

Guideline for water supply drawings which includes updating

the symbology for water supply components which has been released to

CAD users . There has also been some preliminary discussion regarding

as-built survey information collection and an as-built information survey

guideline.

Delivery Teams Smart Innovations

Safety and Environmental inspections and audit by tablet Fletcher’s safety and environmental team are trialling electronic tablets to

carry out their safety /environmental audits. It has already proved to very

effective in saving time and improved the accuracy of information. The

users have particularly found that the ability to take photos on site that

are instantly attached to the audit to be very efficient.

iAudit

Fulton Hogan (FH) EQ Rebuild since June has been conducting and pi-

loting Environmental Audits using the iAuditor tool. The rebuild team is

the first project to utilise this software in FH, and its success and support

by management has already shown great interest by other regions within

FH and also other members of the SCIRT alliance.

The tool is versatile, with the ability to create audit templates, checklists

and forms to suit individual needs. FH has loaded up resource consents

on the share file so that all users have easy and quick access to

the consent conditions. Emailing audits and performing them on tablets

has also meant that there is reduced paper work

and administrative burden on FH staff.

For the full Delivery Team innovations report for August please see

G:\Value\Innovations\Delivery Team Innovation Reports or Annalise

Johns.

Technical groups include representatives from all Deign teams and

also include Delivery team representatives.

If you would like an innovation, standard detail or common design issue

discussed please lodge and innovation on the Project Centre form or talk

to your technical representative.

Technical groups meet monthly or weekly. All meeting minutes can be

found in Project Centre Library, Innovations/technical group.

Onsite auditing by Fulton Hogan

Wastewater—Jeanette White

Water reticulation—Sebastian Ichim

Pump Stations— Patrick Marshall

Geotechnical—Louise Kendal Riches

Land Drainage– Amber Murphy

Structures– Campbell Apthorp

Technical Groups

Fulton Hogan iAudit tool format

1

NOVEMBER 2013

TECHNICAL AND INNOVATIONS UPDATE

Inside this addition:

Technical group updates

Wastewater 2

Geotechnical 3

Water Reticulation 3

Land Drainage 4

Pump Stations 4

Roading 5

Explosive Induced Liquefaction Trials 5

2


Standard Drawings and Specifications

A SCIRT standard drawing for pipe repair methods (SC6312) and a SCIRT standard detail for a vertical risers for lateral connections from mains (SC6314) has been completed and uploaded to Project Centre. Further investigations by the Wastewater (WW) Technical group will be done into improving repair methods and alternative couplings which

could be potentially used in sections replacements.

A l l w a s t e w a t e r p r o j e c t s w i t h r e p a i r / r e l i n e /section replacements strategies are required to note the pipe diameter of each pipe on the plan. This is to help communicate the existing and new network more effectively and emphasise

the location of trunk mains.

Innovations

Couplings

A meeting with Rehau (German based company) took place last month at which a number of Rehau products were presented. Included was a stepped coupling (right) which has great potential for achieving a higher ring seal pressure around the existing and new section replacements than existing shear bands currently available in the New Zealand market. The coupling is lightweight, features a hydrophilic seal and is able to be used on a range of pipes with different outer diameters. Rehau are currently in the process o f app ly ing fo r inc lus ion in the CCC Approved Materials list and the WW Technical group will be

updated on the progress of this process at a later date.

Manhole Venting

A Short Form Report is currently under review by the WW Technical group which summarises the venting of the Christchurch wastewater network and the potential to accommodate venting within a 600mm manhole cover. The report investigates the origins of the existing Christchurch venting systems, capacity and an alternative

venting detail.

Traffic Loading

The current traffic loading criteria for buried structures is currently under review.If approved, this assessment will assist in the design and specification of trafficable chambers and other buried

structures.

Pipe Lining

An additional SCIRT lining specification for larger diameter pipes (over DN 375) has been completed and will be uploaded shortly

to Project Centre.

November 2013


Liquefaction Trials

Rehau Stepped Coupler


Technical and Innovations Update November 2013

3

Geotechnical - Louise Kendal Riches

Innovations

Glass fibre Reinforced Plastic (GRP) Anchors

The Geotechnical Technical group recently had a presentation from the suppliers of GRP Anchors, Bluey. Following this Design teams are considering using these GRP anchors in their designs. These are likely to be for either low height walls or for flexible walls where

the additional flexibility of the GRP may be an advantage.

Impact Barriers

In a change to the previous procedure, it is now required that every retaining wall where an upgraded or new impact barrier is

recommended has a Scope and Standards Paper prepared.

Soil Nails through Crib Wall

In the past it has been challenging for Designers and Delivery Teams to anchor through an existing crib wall. However, the Blue team have successfully designed a crib wall with anchors and a shotcrete facing. The construction involved drilling anchors within a PVC casing through the crib fill and then drilling through the rear of the crib unit because the angle of the anchors could not match the

crib. Following this a shotcrete brushed face was applied.

Water Reticulation-Sebastian Ichim


Thrust Block

An in-line thrust block standard detail is currently being revised by the Water Reticulation Technical group. It is anticipated that short presentation will be given at a Designer’s meeting in the near future about the in-l ine thrust block detai l and

what reference documents are available.

Drawing Legend

A new legend is available for water supply drawings and a

short guideline has been uploaded to Project Centre.

Shared Trenches

The Utilities Design Approval (UDA) form on Project Centre has been amended to include a section for proposing shared trenches where utility companies would like the opportunity to install their services in a

shared trench with new watermains or submains.

Impact Barrier: Cunningham Terrace

SCIRT project 10427

New structures: Rangatira Terrace SCIRT

project 10462



4

Land Drainage-Amber Murphy

CCTV Training

A CCTV Request training workshop was held for Designers to inform them on processes, systems, and tools available for requesting asset assessment. For more information refer

G:\General\CCTV or talk to Mike Tate.

GIS

A new layer, Integrated Planning and Design of Private Property and Roading Related Stormwater Drainage, has been included on GIS. Please refer see the associated guideline within the GIS

Map Metadata for information on this layer.

Non-Critical Defects

Approximately 42 Scope and Standards papers have been prepared for No Action of Non-Critical Defects in stormwater pipes. This amounts to over $50 million that has been saved than can be spent on critical faults. Please consult with the Stormwater Technical group representative or Stormwater Designer in your Design team for further

information.

Pump Stations-Patrick Marshall

Control Cabinet CI Card Update

John McKirdy will be producing a design for Pump Station 105. A Notice of Requirement has been issued to Delivery Teams noting that no control interface (CI) cards are to be installed. If a Pump Station cabinet is constructed with a CI card then CCC are staff to make the adjustment in the field. Andrew Whittle of the CCC. Instrumentation and Control Team will be co-ordinating within Council and Mark Slater will finalise a list of Pump Stations that require

an electrical update.

Panel Level - Lift Station/Pump Stations

Designers are required to consult CCC on the location of each cabinet to check the 50year design flood level (not including climate change, increased rainfall intensity and sea level rise). The cabinet will be initially designed to the standard 1.4 m in height. If the 50year event plus 300 mm freeboard is greater than the base of the cabinet, Don Gracia and Mark Johnson (CCC) should be consulted regarding the height of the cabinet in relation to the heights

of surrounding dwellings

Lift Station Review Process

Designers are required to consult Don Gracia regarding the location of the wet well and the cabinet. Don will be responsible for forwarding to

CCC Roading Asset Representatives for further comment.

Pump Station 107 In Construction

New GIS Land Drainage Layer



5

Roading-Richard Bailey

Coal Tar

A standard detail which addresses the treatment of coal-tar in trenches and roading has been completed and uploaded to Project

Centre (SD6606).

Bill of Quantities

The standardised Bill of Quantities for Roading and Stormwater has

now been uploaded into the Project Centre library.

Stockpiling of Contaminated Material

T h e R o a d i n g T e c h n i c a l g r o u p h a s s u p p o r t e d the centra l ised stockpi l ing and re -use of coal -tar contaminated material, however approval from ECan and CCC will

be required.

Recycled Grout

It was also agreed that recycled grouting material from re-levelling of the Art Gallery would be a good, flow-able fill material as it has the same strength as low-strength concrete back fill. It is anticipated the

material will be suitable for use around structures in roads.

EQC, MBIE and NZTA have undertaken trials within the CERA Resi-dential Red Zone to assess seismic performance of various ground improvement techniques. EQC utilised both a T-Rex machine and explosives to induce liquefaction of the soil and had agreed to include a plot of land within the Residential Red Zone for SCIRT infrastructure trials. Explosives were used within the SCIRT trail to initiate liquefaction and allow the assessment of

post liquefaction performance and effects.

Duncan Gibb noted that SCIRT had taken the opportunity to develop a

trial that would:

Confirm changes made with CCC to design details and specifications to make the underground infrastructure more

resilient

Test innovative concepts to further improve materials

and methods for the horizontal infrastructure rebuild

The purpose of the liquefaction field trials was to assess the effects of liquefaction on various elements of below-ground infrastructure in a controlled and closely monitored field situation. The results will provide information to SCIRT designers in reviewing the appropriateness of current CCC standard details

and proposed alternatives.

Explosive Induced Liquefaction Trials

Land Trials: Controlled Blasting

Previous Trial Example

(source: hhttp://ww.eqc.govt.nz/

canterbury/earthquakes/land/-claims/

landtrials)



6

Wastewater- Jeanette White

Water reticulation- Sebastian Ichim

Pump Stations- Patrick Marshall


Land Drainage- Amber Murphy

Structures- Campbell Apthorp

Roading- Richard Bailey

Technical Groups

A number of different infrastructure tests were completed including :

DN 150 PVC-U SN16 with easily compacted granular haunching

within the trench

DN150 PVC-U SN16 pipe with NZTA AP20 haunching within

trench

Pressure Sewer Chamber (PE) – Granular backfill relieving pore

water pressures

P r e s s u r e S e w e r C h a m b e r ( P E ) – B a c k f i l l with excavated materials (pre-SCIRT). In accordance with suppli-

er installation details.

Pressure Sewer Chamber (PE) – Backfill with excavat-ed materials (pre-SCIRT). In accordance with supplier installation

details.

1050mm dia concrete manhole with connecting PVC-U SN16 pipe, backfilled with AP65. With Long Socket Connection to Test 1 pipe and an Iplex Manhole Connector to a 150mm PVC-U

SN16 dia lateral

DN600 PE manhole with connecting PVC-U SN16 pipe, backfilled

with AP65

Pressure Sewer Chamber (PE) – Low strength concrete backfill

DN150 Restrain PVC-U SN16 pipe installed by directional drilling

Chambers were installed within the zone anticipated to liquefy, while the pipes were installed though both ground which remained non liquefied, liquefied ground and connection with the concrete precast standard manhole. Peizometers were used to monitor the increase in pore water pressure and liquefaction

was induced when the pore water pressure equalled the total stress.

SCIRT will be responsible for exhumation of the site and detailed interpretation of the data. It is anticipated that once the information has been processed a SCIRT presentation will be given to those interested in results of the trials. For more information on

SCIRT’s involvement please contact Marcus Gibson.

For more information on the EQC trials and links to footage

of previous trials refer to the EQC website.

http://www.eqc.govt.nz/canterbury-earthquakes/land-claims/land-trials

Technical groups include representatives from all Design teams and

also Delivery team representatives.

If you would like an innovation, standard detail or common design issue discussed please lodge an innovation on Project Centre form or

talk to your technical representative.

Technical groups meet monthly, weekly or as required. All meeting minutes can be found in Project Centre Library, Innovations/technical group.

6

Site Plan For SCIRT Infrastructure With-

in EQC Explosive

Induced Liquefaction Trial


http://www.eqc.govt.nz/canterbury-earthquakes/land-claims/land-trials

1

APRIL 2014

TECHNICAL AND INNOVATIONS UPDATE

Inside this edition:

Technical group updates

Wastewater 2

Wastewater 3

Geotechnical 4

Land Drainage 4

Roading 6

Delivery Team Innovations 6

Delivery Team Innovations 7

2



The SCIRT Standard Project Specification has been modified to exclude the generic sections. The generic sections will now stand a-lone on Project Centre and include revision numbers which should be referenced in the appropriate areas within the Specification. These specifications are available to the Delivery Teams directly through Project Centre. The new format wi l l s treamline the project documentation and also clarify which revision the TOC

estimate was based on prior to construction.

The generic specifications include:

Pressure Sewer

Trenchless Pipe Installation

Pump Station Electrical

Technical Road Maintenance

Lining (to be updated shortly)

The generic specifications can be viewed at:

Project Centre/ Register / 005 Generic Specifications / 006 SCIRT

Standard Specifications.

Modifications have also been completed to part of the Project Specification for sections relating to flexible pipe embedment material and compaction and a new SCIRT standard detail (SC6315) “Pipe embedment for flexible pipes” has also been

uploaded to the SCIRT library.

The results from trench field trials investigations as well as recommendations from Delivery Team representatives and University of Canterbury academic staff, was incorporated into

the update of sections 2.8.1 and 2.8.3 of the Project Specification [3].

The main changes to part of the Project Specification relate to :

Minimum trench widths (refer to SCIRT standard detail SC6315)

PVC-U minimum pipe class

A new embedment material option

Embedment compaction requirements to replace previous re-quirements for clause 8.5.1 of CSS Part 3-Ultilty Drainage includ-

ing alternative embedment types

Acceptance Criteria for the surface restoration over excavations

The SCIRT Project Specification can be viewed at:

Project Centre/ FileCentre / Library / Specifications./Project Specifica-

tion

Alternatively please contact Tony Gordon (Orange Team 3 Waters Design Lead) for more information or queries regarding

these amendments.

April 2014


Delivery Team Innovations


Technical and Innovations Update April 2014

SCIRT standard detail : SC6315

Pipe embedment for flexible pipes

3

Wastewater – Jeanette White (continued)

Innovations

Manhole Venting

The Short Form report which investigated the origins of the existing Christchurch venting systems and the potential of accommodating a DN600 manhole cover, was expanded to a Scope and Standards pa-per (SS176). This paper was submitted to the Scope and Standards

Committee last month.

CCC Approved Materials Committee have now approved the use of both vented and non-vented Ductile Iron DN600 manhole covers for

wastewater and stormwater.

Plastic manhole chambers and Rehau couplings

Rehau are also in the process of applying for third party accreditation for their DN600 plastic manhole chambers to be included on the CCC Approved Materials list. The use of DN600 plastic man-hole chambers has been previously approved for use through Scope

and Standards paper 206 (SS206).

The Rehau FLEXCONNECT mechanical coupler has been approved for use by the CCC and is now listed on the CCC Approved Materials list. Rehau are now working towards confirming a New Zealand suppli-

er. For more updates to the approved materials list refer to:

ht tp: / /www.ccc.govt .nz/business/construct iondevelopment /

approvedmaterials.aspx#jumplink4

Flushing Siphons

A workshop was held this month to collate the knowledge from the different design teams involved in design of Flushing Siphons for

SCIRT projects.

Currently Flushing Siphons have been proposed and approved for are-as where the renewal of pipes with flat grades has not been the recommended option in order to achieve the best value for the project based on a Level of Service design approach. Various common issues were discussed and resolved at the work-shop including standard terminology for the different configurations,

cover/access details and design steps.

Minutes for the meeting are available in Project Centre:

Project Centre/ Register / Library / Innovations/ Wastewater / Minutes /

Flush

Scope and Standards papers have been approved for four SCIRT projects in the Halswell and Hoon Hay/ Westmorland areas. Currently one Flushing Siphon has been installed and is operating in the Somerfield area at the top of Marley View Street. The system oper-ates automatically and is connected to a restricted mains water supply. As the water level in he Flushing Siphon Chamber reaches a designat-ed point a siphon is used to flush the downstream pipes

to prevent sediment accumulation.



Vented DN600 Manhole: Example of a Ductile

Iron DN600 vented manhole with

dust collector before installation

Flushing siphon :Steinhardt Hyrdoflush

unit before installation

http://www.ccc.govt.nz/business/constructiondevelopment/approvedmaterials.aspx#jumplink4

http://www.ccc.govt.nz/business/constructiondevelopment/approvedmaterials.aspx#jumplink4

4

Geotechnical - Louise Kendal Riches

Innovations

Planning guidance for Retaining Walls Guidance has been developed for SCIRT designers dealing with retaining walls which may be significant with regard to their appearance or age. This is in addition to the existing guidance for walls which are heritage listed in the City Plan and Lyttelton retaining walls which are marked on the Significant Walls List. It specifically addresses walls which are not heritage walls but support a heritage listed property, and walls which are Port Hills rock, or early boxed concrete, but not listed heritage or pre-1900. The photo above right shows a retaining wall which is not a heritage listed structure, but was built as part of the Cashmere Sanatorium in the early 1900s. Guidance for this wall is provided in this document. Specific data is available on request.

The photo below right shows a Port Hills rock wall. This is not a heritage structure, but the walls in this area add character and contribute to it being a special amenity area. Guidance for this wall is also provided in this document. Refurbishing Gabion Walls Anchoring through gabion baskets has been proposed as a method for the repair of two existing walls. It is anticipated that drilling through the baskets may be difficult and therefore a test anchor is due to be installed by Rock Control this month to assess the feasibility of this solution. Groundwater Monitoring SCIRT has recently received extensive groundwater monitoring data from locations across the city. Webmaps contains a layer which shows the piezometer locations and IDs which can be cross-

referenced with the data. Specific data is available on request.



Retaining Wall: Non-heritage structure in

the Port hills

Retaining Wall: Built early 1900’s

5

Land Drainage-Amber Murphy

Innovations

Lightweight Localised Pump Stations SCIRT project NE3 New Brighton Repairs #11110 (currently at the TOC stage) utilises a new innovative design philosophy which focuses on the use of horizontal axial flow pumps which enable shallow and lightweight structures to be used. A Scope and Standards paper (SS269) was submitted and approved for this project which proposed the use of a light-weight localised pump station with horizontal axial flow pumps. This option has a number of advantages from design through the lifecycle of the asset, including Design templates are able to be transferred to other projects

with minor amendments Construction duration and temporary work costs are able to be

greatly reduced as deep excavation in poor ground with a high water table is not required

Stations can be located to serve existing infrastructure or low points, minimising the amount of reticulation required to convey flows to a centralised point

In the case of earthquake damage, repair costs, duration and complexity of repairs are reduced as the structure is relatively small and lightweight allowing the structure to rotate and/or differentially settle and remain operational with minor damage

The relative small size of the structures allows for significant cost saving relating to land acquisition and legal costs as the structures are able to be located within the road reserve

Significant cost savings were identified within SS269 associated with a shorter and safer construction programme in addition to potential cost savings associated with future repairs of

the shallower structures .



Lightweight pump: Light-

weight stormwater pump

with horizontal axial flow pumps

6

Roading-Richard Bailey


The Maintenance Specification has now been uploaded to Project Centre as part of the generic specifications and is not required to

be included in the Project Specification.

RAMM Repairs Rates have been revised and are now aligned with TOC, therefore reducing TOC time and giving more accurate Detailed Design Estimates. There has also been an extensive review of the Roading, Water Services and Stormwater Bill of Quantities. The new RAMM Calculation sheets and Roading, Stormwater and Water supply BOQ template havs been uploaded into the Project Centre library and can be viewed at:

Project Centre/ FileCentre / Library/Templates/BOQ

SCIRT standard drawing SC6601 with new Detail D has also been

uploaded to the Project Centre library.

An example standard CAD layout drawing for Roading projects has been uploaded into Project Centre which will help with standardisation

of SCIRT drawings across all design teams.

The Roading Technical group are also working towards new methodologies for treatment of Coal Tar including treatment of coal tar with cement which may negate the requirement to

wrap contaminated material with fabric .

Directional Drilling Head-Fulton Hogan and CDS

Brief Description: Fulton Hogan were the Delivery Team for the pressure main 128 SCIRT project #10926 and had engaged the drilling expertise of CDS NZ Ltd to complete the directional drilling components of the project . The ground conditions were highly unstable and there were unforeseen areas of organic matter within sandy soils discovered while horizontally drilling. The difficult ground conditions interfered with the drilling fluid and borehole stability which resulted in sink holes forming in the early stages of drilling. With drilling works moving into Bower Ave and passing under a number of major intersections the risk and poten-tial consequences of sink holes was significant and the drilling methodology was modified to mitigate this risk. The response from Fulton Hogan and CDS was to change the drilling approach from a full ream and closed pipe installation, to an open ended cut and pull operation. This eliminated having a large diameter borehole open underground and removed the reliance on the drill fluids to provide down hole stability, which had been compromised on earlier works by pit instability and unforeseen organic concentra-tions.




SCIRT standard drawing SC6601-2

Cleaning head for

open ended horizontal drilling

7

The revised method saw the 800mm OD pipestring pulled into place as the borehole was opened up, lining and supporting the borehole immediately. This methodology mitigated the risk of ground deformation occurring while drilling under Bower Avenue which is a major traffic arterial route in North New Brighton. The change in methodology was successful in preventing sink holes however a method for removing the build-up of material deposited in the pipe during the drilling process was required. CDS developed and constructed a project specific clean out tool to run through the installed pipelines. Given lengths of over 500m, the long reach of CDS’s maxi rig enabled the cleaning tool to be run through the full length of the string and remove the bulk of the sand and fluid within the pipe. The remaining material was then able to be removed with hydrojetters and flushing volumes of clean water through the pipe-lines for final testing and manhole construction.

Coal Tar Encapsulation– Fletchers

Brief Description: Note: This proposal is not a current CCC practice at time of circulation. Encapsulated material must be deposited above the water table. The Fletchers Delivery team have proposed an alternative Coal Tar Encapsulation detail for one of the Coal Tar contaminated streets within the SCIRT project #11131. Fletcher were expecting to remove approximately 220m3 of coal tar impacted material from Averill Street in the Richmond area. The current detail for recycling this type of material into the road is to encapsulate it into a 100mm thick layer sand-wiched between geotextile and clean sub-base material. Fletchers proposed a detail which encapsulated the material into a slip trench located adjacent to the kerb line, approximately 500mm deep below road formation level and between 1000-2000mm wide. This detail had the following advantages: The trench could be excavated ahead of the removal of the road

surface therefore double handling was mitigated The coal tar could be mixed with cement using a rotary hoe

therefore removing the need for clean fill material to be added Locating the coal tar trench in a parking area of the

road minimised traffic loading Limiting encapsulation to the edge of the road will assist with

future maintenance issues This detail was environmentally friendly and cleaned up 85% of

the road The extent of area rehabilitated was easy to define and plot on

GIS


Coal tar: Design sketch for coal tar

encapsulation in the road


Fulton Hogan/CDS Innovation : Cleaning

Head for open ended horizontal drilling

8

Wastewater- Jeanette White

Water reticulation- Sebastian Ichim

Pump Stations- Patrick Marshall


Land Drainage- Amber Murphy

Structures- Campbell Apthorp

Roading- Richard Bailey

Technical Groups Technical groups include representatives from all Design teams and

also include Delivery Team representatives.

If you would like an innovation, standard detail or common design

issue discussed please lodge an innovation on the Project Centre

form or talk to your technical representative.

Technical groups meet regularly. All meeting minutes can be found in

Project Centre Library, Innovations/technical group.


Documents

TechTimes Newsletters...rebuilding the earthquake damaged pipes, roads, bridges and retaining walls in the city of Christchurch 2011 - 2016. This document has been provided as an example