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    • 91. 发明专利
    • Casing tube for earth drill method, and method for constructing cast-in-place pile using the same
    • 用于地球钻孔方法的铸管和使用该方法构造铸件的方法
    • JP2010090557A
    • 2010-04-22
    • JP2008259297
    • 2008-10-06
    • Takenaka Komuten Co Ltd株式会社竹中工務店
    • YAGUCHI SHIRO
    • E21B17/18E02D5/34E21B7/20E21B21/08E21B29/00
    • PROBLEM TO BE SOLVED: To secure the quality of a cast-in-place pile by decreasing a change in the water level of hole wall slurry, when the cast-in-place pile is constructed by an earth drill method.
      SOLUTION: This casing tube A for the earth drill method is constituted by forming a bypass path B through which the hole wall slurry 4 lifted to the outside of a steel pipe 1 for a casing by a drilling bucket 3 flows back into a drilled hole below the drilling bucket 3. The bypass path B is formed of a plurality of pipes 2 which are fixed to the outer periphery of the steel pipe 1 for the casing and both the upper and lower ends of which are communication-connected to an internal space of the steel pipe 1 for the casing, or formed by making the steel pipe 1 for the casing employ a double pipe structure and communicating both upper and lower ends of a gap, formed between the inside and outside steel pipes 1a and 1b, with the internal space of the inside steel pipe 1a.
      COPYRIGHT: (C)2010,JPO&INPIT
    • 要解决的问题:通过减少孔壁浆料的水位变化来确保现浇桩的质量,当通过地钻方法构造现浇桩时。 解决方案:用于地钻方法的这种套管A通过形成旁路路径B构成,通过钻孔铲斗3将孔壁浆料4提升到用于套管的钢管1的外部的孔壁浆料4流回到 钻孔3下方的钻孔。旁通通道B由固定在壳体用钢管1的外周的多个管2形成,上下两端连接于 或者通过使外壳钢管1a和1b之间形成的用于壳体的钢管1采用双管结构并且连通两个上下端的间隙的方式形成的壳体的钢管1的内部空间, 内侧钢管1a的内部空间。 版权所有(C)2010,JPO&INPIT