E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
61/5.8
E21B 43/01 (2006.01) E21B 7/00 (2006.01) F16L 1/26 (2006.01) F16L 5/02 (2006.01)
Patent
CA 1051676
ABSTRACT OF THE DISCLOSURE A method of making a connection to protect a shore approach section of an underwater pipeline comprises drilling a hole downwardly through the sea bed, introducing a sealed pipe riser, which may, or may not, have an elbow welded to the upper end thereof, into the hole; grouting the inserted pipe riser in the hole and connecting a tunnel section to the shore with the pipe riser. A pipe is passed through the tunnel and joined to the pipe riser. The tunnel pipe may be connected to the pipe riser after the drilling of the hole by the completion of the tunnel to intersect the pipe riser or, in the alternative, the tunnel section may be completed first and have the leading end thereof sealed off by a bulkhead, whereafter the hole is drilled to intersect the tunnel at the sealed off tunnel end and the connection of tunnel pipe and pipe riser is accomplished by dewatering the leading end of the tunnel and opening the bulkhead. The method is particularly useful in ice covered water crossings and here the drilling of the hole is accomplished using the ice surface as a support platform for the drilling rig.
285449
Montreal Engineering Company Limited
Na
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