DOUBLE-TUBE TREMIE USES AMBIENT WATER TO PROTECT MIX

The tremie system described here used a clip valve and surrounding water to empty the tremie tube and keep it dry-between discharges. The double tremie system consists of an outer pipe with slits along its walls that permit water to flood the systems annular space between tubes, and an inner plastic tube of textured 2-mm-thick PVC, reinforced with nylon fiber to increase the tube's strength and life. The equipment is designed for placing concrete underwater over a wide area by repeated resetting of a small number of pipes without endangering the quality of the finished concrete. As falling concrete inflates the plastic tube, a dip valve in its bottom end opens to discharge mix. When concrete stops falling, water entering the outer pipe through the slits squeezes remaining concrete from the inner tube. The bottom valve immediately seals the tube after final mix is discharged. With the tube squeezed flat and the valve closed, the tremie system can be repositioned for continued concreting, without fear of introducing water that might dilute or segregate the mix. Details are outlined of the successful placing of 33,000 yd. of concrete underwater for a dry-dock flooring using the double-tube method. Three double-tube tremies mounted on a 90-ft-long, 40-ft-wide raft assembled from plugged steel pipes handled the concreting. Nine men handled the tremie pipes; six others attended pumps and slicklines, and each 740-yd load was placed in a 10-hr shift.

  • Corporate Authors:

    IPC Science and Technology Press Limited

    IPC House, 32 High Street
    Guildford, Surrey  England 
  • Publication Date: 1975-9

Media Info

  • Features: Figures;
  • Pagination: p. 54-55
  • Serial:
    • Cryogenics
    • Volume: 57
    • Issue Number: 9
    • Publisher: Butterworths and Company Publishers, Limited

Subject/Index Terms

Filing Info

  • Accession Number: 00127474
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 10 1976 12:00AM