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A guideline to inform designers of the pipe profilometer operation, including requesting profile surveys, standards, and the assessment of the survey results.
Inspection of the gravity wastewater pipes was typically undertaken by Closed Circuit Television (CCTV).
However, one limitation of CCTV was its relative inability to accurately quantify pipe dips with the precision demanded by the Council or Industry Specifications.
SCIRT proposed that damaged gabion retaining walls could be refurbished by installing anchors through the existing baskets, secured into the ground behind them. This could provide a cost and time saving because baskets would not need to be removed or replaced and, therefore, significant volumes of excavation and backfill work could be avoided with resulting reduced construction time.
A suite of 31 management plans were developed under the Interim Alliance Agreement prior to the start of SCIRT, to intentionally guide the organisation. These plans were reviewed annually and updated as required.
SCIRT's Design Management Plan provided the framework for effective design activities and explained how those activities were to be undertaken to meet requirements and support the achievement of rebuild objectives.
The plan concerned all design activities associated with permanent works for a rebuild programme. The overarching goals were to:
A pipe damage assessment tool (PDAT) was developed to give a risk based prediction of pipe condition to avoid the need for a CCTV survey of every pipe in the city.
With more than 2,500 km of storm water and wastewater pipes needing to be assessed for damage before design work could start, SCIRT needed to develop a fast, cost-effective way of determining pipe damage, without having to Closed-circuit Television (CCTV) survey every pipe.
How separate design teams from previously competing organisations came together and operated in a collaborative way. The consultancy organisations involved in SCIRT's design team were recognised for their collaboration with an ACENZ Innovate NZ Award of Excellence in 2016.
Design services were not part of the formal SCIRT Alliance, but were engaged separately from various consultancy organisations as well as the Christchurch City Council.
The challenges of rebuilding underground infrastructure in liquefaction-prone Christchurch were put under the microscope in a controlled field assessment of the performance of below ground infrastructure in simulated liquefied soils.
Asset Owner's Representatives and Technical Leads from the New Zealand Transport Agency and Christchurch City Council were co-located with the team at SCIRT's central office. There were one or two Asset Owner's Representatives and Technical Leads per asset type. Their role was to provide an Asset Owner's perspective to the rebuild of the city's infrastructure.
Asset Owner's Representatives worked closely with the Project Definition, Asset Assessment and Design teams to assist with developing SCIRT's scope of work in accordance with the Asset Owner's standards and guidelines.
SCIRT developed a Design Guideline for an Automated Flushing Siphon System to reduce the frequency of blockages in the wastewater network caused by pipe dips and flat grades.
To share knowledge and make the most of combined expertise, Technical Groups were formed within SCIRT during the design phase for each engineering discipline, including wastewater, land drainage, geotechnical, structures, pump stations and roadways.
Technical Groups met on a regular basis and were established to utilise the shared knowledge of the wider SCIRT to:
SCIRT standard details were developed to ensure a consistent approach to common design elements, and to save design time by providing a quick reference to an agreed standard design rather than creating new design drawings of the same element. For example, a standard drawing for a water supply backflow preventer.
Standard details also clarified the requirements of the Infrastructure Recovery Technical Standards and Guidelines (IRTSG) and the Construction Standard Specification (CSS), for example when the information was out of date.