Hong Kong
| Participants | |
|---|---|
| Owner | Government of the Hong Kong Special Administrative Region |
| Contractor | Intrafor Hong Kong Ltd. |
| Location of the Job Site | Tung Chung construction site Nearby the Hong Kong Air Port area |
| Tender | |
| Short Description of Job | Pipe roof for a tunnel project comprising 44 canopy pipe drills each 60 or 70 m long |
| Specifications for Tenders | 44 steel pipes OD 813 mm wall thickness 16 mm Single pipe length 12 m, joints fully welded Steel pipes to be installed in grouted granite rock fill and bedrock granite up to 250 MPa accuracy required vertical ±75 mm, horizontal ±100 mm Ground water |
| Alternative Methods proposed by the Constructor | Front Steer with DTH hammer and optical guiding system |
| Ground conditions | |
| Described Ground in the Ground Report | Grouted granite rock fill, with silt an clay and bedrock granite |
| Encountered Soils | Grouted granite rock fill and bedrock granite with boulders larger than 4 m with silt and clay parts |
| Depth of Coverage | 12 to 13 m under the Rail Tracks of the AEL (Airport Express Link) |
| Accuracy | vertical ± 75 mm, horizontal ± 100mm |
| Time for Job or Production Rate | Production rates: 4 to 8 m/hour, machines operated in two shifts, underneath the rail tracks drilling only allowed between 1:00 am and 4:30 am |
| Driving Length | 60 – 70 m |
| Any other Specifics | Guided auger boring with DTH hammer and optical guiding system |
Bohrtec Gesellschaft für Bohrtechnologie mbH
Konrad-Zuse-Straße 24
D - 52477 Alsdorf
+49 (0) 2404 9881 - 0
+49 (0) 2404 9881 - 10
info