HIGH SPEED WATER -AIR JET USED FOR SOIL IMPROVEMENT IN JAPAN

A method of improving soil conditions for building foundations and attaining earthquake resistance has been developed. A pilot hole is drilled to the desired depth in the ground and a monitor is lowered into it. Incorporated in the monitor is a high-speed rotary jet which forces a mixture of water and air through narrow nozzles. The blasting rotary action excavates a cylindrical hole from the bottom up. The hole is filled with a liquid cement grout as the monitor is withdrawn. The grout sets within 24 hours into a solid pillar capable of supporting buildings, sets within 24 hours into a solid pillar capable of supporting buildings, piers, or bridge structures. The diameter of the column is controlled by the pressure of the jets and the speed of the withdrawal of the monitor. The technique is said to be suitable for most soils and even soft rock. Columns of two or three meters in diameter can be constructed. The technique produces little noise or vibration, and little chance of grout overflow. The accurate placement of the boreholes makes it possible to position columns in a continuous underground wall or in individual locations. The method was successfully applied in Shimizu-city, Shizuoka Prefecture, Japan.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/25073860
• Corporate Authors:

  International Road Federation

  525 School Street, SW
  Washington, DC  United States  20024
• Publication Date: 1980-8

Media Info

• Pagination: p. 5
• Serial:
  • World Highways/Routes du Monde
  • Volume: 31
  • Issue Number: 8
  • Publisher: Route One Publishing Limited
  • ISSN: 0964-4598
  • Serial URL: http://www.worldhighways.com

Subject/Index Terms

• TRT Terms: Cement grouts; Earthquake resistant design; Earthquake resistant structures; Foundation soils; Foundations; Grouting; Improvements; Presplitting (Blasting); Soft rock; Soils; Waterjets
• Old TRIS Terms: Air jets; Foundation grouting
• Subject Areas: Construction; Geotechnology; Highways; I42: Soil Mechanics;

Filing Info

• Accession Number: 00322902
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 19 1981 12:00AM