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Performance Monitoring of Deep Shafts at Changi WRP Project, Singapore
The construction of three deep shafts forming part of the Influent Pumping Station (IPS) at Changi Water Reclamation Plant project required the installation of circular diaphragm (slurry) walls followed by the top-down casting of structural reinforced concrete lining walls. This paper describes the performance monitoring of the circular diaphragm walls utilizing a number of diaphragm wall panels of each shaft instrumented with inclinometers and vibrating wire (VW) strain gauges. The performance monitoring of the diaphragm walls allowed the construction of IPS shafts in 8 stages rather than originally planned 10 stages, reducing the critical construction time by approximately 2 months for each shaft. It also minimized a number of underpinning joints between successive stages of inner ring walls resulting in additional time and cost savings. The use of pro-active engineering during construction, together with comprehensive instrumentation ensured that all stakeholders were satisfied that changes to the construction sequence could be made safely and effectively, providing real benefits to the Project. The Pumping station facility was successfully commissioned during the last quarter of 2005, under budget and ahead of schedule.
Performance Monitoring of Deep Shafts at Changi WRP Project, Singapore
The construction of three deep shafts forming part of the Influent Pumping Station (IPS) at Changi Water Reclamation Plant project required the installation of circular diaphragm (slurry) walls followed by the top-down casting of structural reinforced concrete lining walls. This paper describes the performance monitoring of the circular diaphragm walls utilizing a number of diaphragm wall panels of each shaft instrumented with inclinometers and vibrating wire (VW) strain gauges. The performance monitoring of the diaphragm walls allowed the construction of IPS shafts in 8 stages rather than originally planned 10 stages, reducing the critical construction time by approximately 2 months for each shaft. It also minimized a number of underpinning joints between successive stages of inner ring walls resulting in additional time and cost savings. The use of pro-active engineering during construction, together with comprehensive instrumentation ensured that all stakeholders were satisfied that changes to the construction sequence could be made safely and effectively, providing real benefits to the Project. The Pumping station facility was successfully commissioned during the last quarter of 2005, under budget and ahead of schedule.
Performance Monitoring of Deep Shafts at Changi WRP Project, Singapore
Parashar, Suresh (author) / Mitchell, Roger (author) / Hee, Moh Wung (author) / Sanmugnathan, Devaraj (author) / Nicholson, Gordon (author)
Seventh International Symposium on Field Measurements in Geomechanics ; 2007 ; Boston, Massachusetts, United States
FMGM 2007 ; 1-12
2007-09-21
Conference paper
Electronic Resource
English
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