Bassett et

Abstract

Abstract 1. A METHOD OF GROUTING AN OFFSHORE STRUCTURE HAVING AT LEAST ONE SUPPORTING LEG INCLUDING A TUBULAR JACKET EXTENDING DOWNWARDLY FROM ABOVE THE WATERLINE TO THE SEABED AND A PILING DRIVEN THROUGH SAID JACKET INTO THE SEABED WITH AN ANNULAR SPACE EXISTING BETWEEN THE INSIDE OF THE JACKET AND SAID PILING, SAID METHOD COMPRISING THE STEPS OF A. SEALING THE UPPER END OF SAID JACKET TO SAID PILING SO AS TO CLOSE SAID ANNULAR SPACE AT THE UPPER END OF THE JACKET, B. INTRODUCING COMPRESSED AIR INTO SAID ANNULAR SPACE AT A POINT ADJACENT THE UPPER END OF THE JACKET AND ABOVE THE WATERLINE SO AS TO EXPEL WATER FROM SAID SPACE THROUGH THE LOWER END OF THE JACKET, C. INTRODUCING FLUID GROUTING MATERIAL INTO SAID ANNULAR SPACE AT A POINT ADJACENT THE UPPER END OF THE JACKET AND ABOVE THE WATERLINE AFTER WATER HAS BEEN EXPELLED FROM SAID SPACE AS AFORESAID, D. SIMULTANEOUSLY MAINTAINING STATIC AIR PRESSURE IN SAID ANNULAR SPACE SUFFICIENT TO PREVENT INGRESS OF WATER THROUGH THE LOWER END OF SAID JACKET WHILE THE GROUTING MATERIAL IS BEING INTRODUCED INTO SAID SPACE, AND E. PERMITTING THE GROUTING MATERIAL TO SET.

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