Qatar

Participants
Owner QDVC Qatar
Contractor Bauer International for 3 Tunnels
Location of the Job Site Doha, Katar, Al Matar Station
Tender
Short Description of Job Pipe roofs for 8 tunnel projects
comprising 23 canopy pipe drills up to 74 m long
Specifications for Tenders 8 tunnel
23 drills per tunnel with steel pipes OD 508 mm
wall thickness 10 mm
Single pipe length between 6 and 12 m, joints fully welded
Steel pipes to be installed in partially weathered limestone up to 50 MPa
accuracy required vertical ± 100 mm, horizontal ± 50 mm
Alternative Methods proposed by the Constructor Front Steer with DTH hammer and optical guiding system
Front Steer with flat drilling head and optical guiding system
Ground conditions
Described Ground in the Ground Report Partially weathered Limestone with Uniaxial Compressive Strength up to 30 MPa
Encountered Soils Partially weathered Limestone with Uniaxial Compressive Strength up to 50 MPa
Depth of Coverage Varies between 5 and 6 m underneath the motorways
Accuracy Vertically ±100 mm, Horizontally ±50 mm
Time for Job or Production Rate Production rates: 4 to 6 m/hour for Front Steer with flat drilling head and 6 to 10 m/h for Front Steer with down-the-hole hammer, timeframe to complete one 72 m long drive 48 hours, machines operated in two shifts
Driving Length 60 to 74 m
Any other Specifics Guided auger boring with DTH hammer and optical guiding system
Very high requirements for the accuracy
Very small distances between the pipes
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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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