DEVELOPMENT AND APPLICATION OF A JAPANESE GROUTING SYSTEM

The authors outline the principles and practical application of a newly-developed grouting system which effectively uses a high-speed water or air-and-water jet to break up the soil prior to grouting and, using a system comprising an air lift pump and an ejector pump, to place a bentonite slurry. The axial dynamic pressure of the water jet decreases in proportion to an increase in the distance between the nozzle and soil surface. Therefore, in developing this new method the form, shape and finish of the inner surface of the nozzle have been improved in order to reduce this rate of decrease. There are, however, many cases where this system is required to break up soil containing groundwater. A method was devised whereby a jet of air was emitted at high speed from the same nozzle, round the high-speed water jet, to prevent reduction in efficiency when the jet is acting in a liquid phase. To date this method has been used successfully at dam sites, in shield work and on building sites, where the main purpose has benn to cut off water flows (curtain grouting, joining underground diaphragms) and to prevent water leakage from the dam reservoir. It is also expected that the method may be used to prevent soil flow caused by excavation, and to improve the strength properties of soft ground. /DOT/

  • Corporate Authors:

    IPC Business Press Limited

    35 Perrymount Road
    Haywards Heath, Sussex,   England 
  • Authors:
    • Yahiro, T
    • YOSHIDA, H
    • Nishi, K
  • Publication Date: 1975-2

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Filing Info

  • Accession Number: 00084210
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 10 1975 12:00AM