OFF SHORE SHAFT CONSTRUCTION IN THE NORTH SEA

A METHOD OF CONSTRUCTION IN WHICH THE DRILLING AND ALSO THE LINING OF THE SHAFT WOULD BE COMPLETE IN SEQUENCE FROM AN EIGHT LEGGED WORK BARGE IS DETAILED, AND THE COOLING SYSTEM CONSTRUCTION CONTRACT IS DESCRIBED. DIAGRAMS ILLUSTRATE THE LOCATION OF THE SHAFTS AND CYLINDRICAL CASING UNIT FOR PERMANENT SHAFT LINING. THE STEPS IN CONSTRUCTION ARE REVIEWED. THE UPPER PART OF THE HOLE WOULD BE PROTECTED DURING DRILLING BY A PILEDRIVEN CONDUCTOR CASING EXTENDING INTO THE FIRM CLAY LAYERS OF THE SEA BED AND PROJECTING ABOVE SEA LEVEL INTO A GUIDE FRAME ATTACHED TO THE SIDE OF THE WORK BARGE. DRILLING WAS PERFORMED BY A ROTARY DRILL DRIVEN BY A BORING TABLE SECURED TO A CANTILEVER STRUCTURE FIXED TO THE BARGE. THE CONSTRUCTION METHOD HINGED ON THE OPERATION OF LOWERING AND GROUTING A SEALED CYLINDRICAL CASING INTO A PREDRILLED HOLE, THE DRILLING PLATFORM AND ITS LOCATION, SHAFT EXCAVATION, PREPARATION AND POSITIONING OF THE SHAFT CASING AND THE GROUTING OF THE SHAFT CASING ARE DESCRIBED IN DETAIL. COMMENTS ARE MADE ON THE PROGRAM AND PERFORMANCE, AND DIFFICULTIES ENCOUNTERED ARE DISCUSSED.

Media Info

  • Features: Figures;
  • Pagination: p. 915-29
  • Serial:
    • Volume: 2

Subject/Index Terms

Filing Info

  • Accession Number: 00236568
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1974 12:00AM