Submerged pile grouting

Details Submerged pile grouting Submerged pile grouting

E - Fixed Constructions

02

B

61/12.1

E02B 17/02 (2006.01)

Patent

CA 1135064

SUBMERGED PILE GROUTING ABSTRACT OF THE DISCLOSURE Apparatus and method is disclosed for filling the annulus between the jacket and piling of members of cluster or pin piles with fluid grouting material. Cluster or pin piles surround and support a main leg can of an offshore rig. The main leg extends to the water surface and supports the platform of the rig. The cluster or pin piles terminate below the water surface. Each cluster or pin pile includes a hollow, cylindrically shaped jacket with a piling through it. A dual packer, comprising two, vertically separated packers is used to seal the jacket of the cluster or pin pile to the piling. An annular chamber is formed between the two packers. Dual lines provide fluid flow communication between the annular chamber and apparatus located at the water surface. The apparatus at the water surface uses the dual lines to exhaust water from the annular chamber and set the packers. These dual lines also are used by the apparatus to test the integ- rity of the seal of the packers with the jacket and the piling, and fill the annular chamber with liquid grout- ing material, including when either of the packers does not form a seal with the piling or the jacket. The dual lines are additionally used to apply pressure to the fluid grouting material to aid in forming a bond between the fluid grouting material and the jacket and the piling. The method includes the steps of: (a) setting the dual packer; (b) introducing air to expel water from the annular chamber; (c) testing the annular chamber to determine the integrity of the seal of the dual packer with the piling and the jacket; (d) filling the annular chamber with fluid grouting material; and (e) applying pressure to the fluid grouting material to aid in forming a bond between the fluid grouting mater- ial and the jacket and the piling.

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