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Counterflow prevention manner null to the pile hole foot protection section of the excavated soil in the inner excavation method
Counterflow prevention manner null to the pile hole foot protection section of the excavated soil in the inner excavation method
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机译:内开挖法防逆流方式对开挖土的桩孔脚保护段无效
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摘要
PURPOSE: To prevent the counterflow of excavated earth into a pile hole, in a pile-hole drilling rod fitted with a spiral, through the spiral when the pile-hole drilling rod is reversely turned, and to prevent the counterflowed excavated earth from being mixed with cement milk in the consolidation part for forming a strong consolidation part. ;CONSTITUTION: An excavating head 3 is fitted at the end of a drilling rod body 1, and above that a nonspiral part 4 of a prescribed length L is provided, and further above that a spiral 5 for lifting excavated earth is provided. By projectedly providing stirring rods 6 in the radial directions to the nonspiral part 4, a pile-hole excavating head 7 is constituted. And the length L of the nonspiral part 4 is made to be approximately L=2D, where the D is the outside diameter of the pile.;COPYRIGHT: (C)1993,JPO&Japio
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