Title:
METHOD FOR OPENING HOLE ON SHEATH TUBE FOR RE-INJECTING PRECAST CONCRETE GROUT
Document Type and Number:
Japanese Patent JP2016196783
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a method for opening a hole on a sheath tube for re-injecting precast concrete grout, the hole being opened on a precast concrete structure at a diameter small as possible and damaging the precast concrete structure only a little, without a concern over a damage to a tensile material inserted into the sheath tube, and the hole being opened in a short period of time.SOLUTION: A method for opening a hole on a sheath tube for re-injecting precast concrete grout is for opening a hole on a sheath tube Y of an existing precast concrete structure X for re-injecting precast concrete grout into the sheath tube Y, and includes the following steps: a concrete drilling step in which a concrete part of the precast concrete structure X is drilled to a position close to an outer surface of the sheath tube Y, using a drilling machine 2 having a drive motor 20 for rotating a shaft 21 and a drill bit 22 measuring 30 mm or less in diameter and fitted at a tip of the shaft 21; and a sheath tube hole opening step in which a hole is opened from an end of a hole H1 drilled in the concrete drilling step to penetrate through a part of the sheath tube Y, by striking a sheath surface using hole opening jigs 5 to 7 made of a material of a hardness lower than a tensile material inserted into the sheath tube Y.SELECTED DRAWING: Figure 13
Inventors:
WATASE HIROSHI
SHOJI AKIO
TAKAHASHI KENICHI
SATO SATOSHI
SUNAGA KAN
SHOJI AKIO
TAKAHASHI KENICHI
SATO SATOSHI
SUNAGA KAN
Application Number:
JP2015077633A
Publication Date:
November 24, 2016
Filing Date:
April 06, 2015
Export Citation:
Assignee:
ORIENTAL SHIRAISHI CORP
TS PLANNING:KK
YSM CORPORATION:KK
TS PLANNING:KK
YSM CORPORATION:KK
International Classes:
E04G21/12; B23B45/16; B28D1/14; E04G23/02; E21B7/00
Attorney, Agent or Firm:
Yasuhiko