Review of pipe jacking application in Bangkok subsoils | |
| Author | Chaturong Disthanuson |
| Call Number | AIT Thesis no. GE-98-11 |
| Subject(s) | Tunneling--Thailand--Bangkok Trenchless construction |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Science, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | A large number of pipe jacking projects of various sizes (up to 3200mm diameter.) have been performed in Bangkok for reason of less traffic disturbance compared with the conventional trench excavation. This thesis investigated their techniques and performance. In Bangkok, pipe jacking has been applied for line installation such as sewer line, power ducts and pipe crossing under canals or streets. Jacked pipes behind shields, which varied from simple to sophisticate types with precise controlling alignment and ground movement devices, were reinforced concrete and steel pipe. Alignment of pipelines was mainly located along the streets at 3-20 m depth. Jacking shafts were permanently or temporarily constructed. For permanent one, it was constructed by sinking down the precast concrete or casting in place concrete. Later, it was used as manholes. For temporary one, it was constructed by using braced sheet piles that would be pulled out after jacking operation. In shaft design, base stability, bearing capacity, lateral earth pressure and hydraulic uplifted pressure were checked. Pipe design considered active and gravity loads acting on pipe or followed tunnel lining design. Thrust walls which provided driving force to pipeline by hydraulic jacks were located at one side of shaft wall and its resisting force was designed by using passive earth pressure, adhesion force and/or other supported force. Jacking resistance was back calculated from actual jacking force data. The resistance could be reduced by lubrication with bentonite or polymer. Average of advance rate was 10 to 20 rn/day and construction tolerance of± 100 mm for line and ± 50 mm for level could be achieved by special shield. Length of drive was up to 450 m with an aid of intermediate jacking stations. Difficulties were found mainly in changes of ground condition, inadequate controlled of alignment and grade, and underground obstruction. In worse ground condition, ground improvement was applied for shaft stability. In some case, pipe jacking in soft clay closed to building, pre-treatment by jet grouting was applied for controlling of ground movement. |
| Year | 1999 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Noppadol Phien-wej; |
| Examination Committee(s) | Balasubramaniam, A. S.;Bergado, D. T.; |
| Scholarship Donor(s) | External Scholarship; |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1999 |