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Title:
HOLE DRILLING METHOD
Document Type and Number:
Japanese Patent JP2015113562
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a hole drilling method capable of determining whether or not to reach a target layer, even in the drilling in which a rod is vertically moved at a comparatively short hole drilling depth and with a small resistance value of an electric motor with respect to the drilled ground, when drilling a boring hole.SOLUTION: The hole is drilled in the ground by vertically moving the hole drilling rod, and effective use electric power is arithmetically operated from an electric current supplied to the electric motor for rotating the hole drilling rod and a hole drilling time, and when the effective use electric power becomes a threshold value or more, it is determined as reaching up to a layer capable of becoming as a support layer, and the effective use electric power is a numeric value obtained by multiplying the electric current by the time of drilling the hole in the ground, and the time of drilling the hole in the ground is the time required for drilling the hole in the undrilled ground, and does not include the time for vertically moving in an already drilled area.

Inventors:
KUMEGAWA MASANORI
SOMA HIROSHI
NORO YOSHITAKA
Application Number:
JP2013253950A
Publication Date:
June 22, 2015
Filing Date:
December 09, 2013
Export Citation:
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Assignee:
CHEMICAL GROUT CO
International Classes:
E02D1/02
Domestic Patent References:
JPS54147601A1979-11-19
JPH11280055A1999-10-12
Foreign References:
US4958962A1990-09-25
Attorney, Agent or Firm:
Takahashi Patent Office