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
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Bohrtec Gesellschaft für Bohrtechnologie mbH
Konrad-Zuse-Straße 24
D - 52477 Alsdorf
+49 (0) 2404 9881 - 0
+49 (0) 2404 9881 - 10
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