| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemical injection construction method and a chemical injector for reducing cost for a ground improvement, by reducing the quantity of chemicals to be used, while maintaining the ground improvement effect. SOLUTION: In this chemical injection construction method, an outer pipe 3a having a through-hole penetrating toward an outside surface from an inner surface is inserted into an injection hole 9 arranged in the ground, and an inner pipe 3b having a jetting part 3g delivering the chemicals to the tip side and having a packer 3h in an upper part and a lower part in the axial direction by sandwiching the jetting part 3g, is inserted into the outer pipe 3a, and after blocking up clearance between the outer pipe 3a and the inner pipe 3b by the packer 3h while making the depth of the through-hole and the jetting part 3g substantially coincide, the chemicals are injected into the ground via the through-hole by delivering the chemicals from the jetting part 3g. A micro-bubble generator 10 is arranged in the inner pipe 3b for including micro-bubbles while generating the micro-bubbles in the chemicals flowing in the inner pipe 3b, and the chemicals are injected into the ground including the micro-bubbles by passing through this micro-bubble generator 10. COPYRIGHT: (C)2007,JPO&INPIT
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