Planning, Design and Constructability Aspects of Longer Trenchless Drives for Gravity Sewer Installations
Trenchless construction for gravity flow installations presents considerable challenges as well as opportunities for the planners and the constructors.The need to achieve accuracy of line and grade,prediction and control of jacking forces,and ensuring structural integrity of installed pipes are some of the key issues that determine efficient and effective outcomes for longer jacking drives.As drive length increases,so is the likelihood of encountering complex geological conditions,and increased difficulties with controlling the alignment of the pipe string.This paper discusses how these issues were addressed in the planning study for the Bulimba Creek Trunk Sewer in Brisbane,Australia.For the 4.2 km long DN1500 gravity trunk sewer,up to 500m long drives were planned to avoid deep intermediate shafts in elevated and difficult to access topography.The shear interaction between pipe walls and ground,influence on jacking forces of key ground properties; and deformations of the overcut annulus around pipe were studied.The results were used to calculate jacking loads,estimate realizable drive lengths and planning shaft locations.Superior project outcomes with respect to design approach,constructability and environmental impacts were achieved for a deeper alternative alignment than originally intended.
Trenchless MTBM Jacking forces Gravity sewer Longer jacking drives
Raghvendra Bhargava
Senior Tunnel Design Engineer, PB, Parsons Brinckerhoff Australia; 69 Ann Street, Brisbane, Queensland 4001, Australia
国际会议
北京
英文
1963-1976
2012-10-14（万方平台首次上网日期，不代表论文的发表时间）