A jet grouting system is described which may be used to build soil cement underground cutoff walls. The cutoffs go in fast, have a compressive strength of 200 psi and cost about $5.50 per sq. foot. Three concentric pipes from the basis of the system which simultaneously ejects an air-water jet and grout. The injection pipe, lowered into position at the bottom of a 4.5-in.-dia. slurry-filled guide hole, hydraulically excavates a narrow slot in the soil with a jet of water that exits through a 0.064-in.-dia. orifice in the pipe wall. A cone of compressed air exiting through a 0.8-in.-dia. hole that encircles the water jet, protects the water and boosts its force. Low-pressure grout discharge from the end of the pipe, creating the wall as the device rises in the guide hole. Control of the air curtain around the water jet is considered the key to the process. The technique which can be used in most clays, silts, sands and soils containing gravels up to 4-in.-dia, is especially useful for building temporary cutoff walls in situations that will not allow pile driving or conventional slurry wall construction. Practical problems encountered in the Japanese project are discussed.

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  • Corporate Authors:

    McGraw-Hill, Incorporated

    330 West 42nd Street
    New York, NY  United States  10036
  • Publication Date: 1974-5-2

Media Info

  • Pagination: p. 16
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00264830
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 31 1974 12:00AM