Liner for large diameter borehole

Details Liner for large diameter borehole Liner for large diameter borehole

E - Fixed Constructions

21

B

166/68

E21B 17/00 (2006.01)

Patent

CA 1102691

ABSTRACT OF THE DISCLOSURE A means of anchoring a lining of low flexural rigidity with grout into a borehole drilled in the earth, which comprises a relatively thin- walled cylinder which may be composed of steel, elastomeric or plastic material of selected diameter, which is less than that of the borehole. A plurality of keys, each having one end bonded to the wall of the cylinder extend outwardly, and have an enlarged head portion which is adapted to be bonded to the grout, which will fill the annular space between the cylinder and the borehole. A plurality of vertically spaced support rings may be used which surround the cylinder and are attached to the cylinder by means of a plurality of keys. The support rings may be supported and spaced apart by means of circumferentially spaced rods, which are attached at their ends to the support rings and are guided at intermediate positions to keys which are locked to the cylinder.

316481

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