JPH031672Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a rotation correction jig for a T-shaped pipe for insertion in a pipe-in-pipe construction method.

Conventional technology In the pipe-in-pipe construction method in which a new pipe is inserted inside an existing pipe, a flanged T-tube with a small amount of lateral protrusion can be inserted along with a straight pipe. .

Problems that the invention aims to solve By the way, when inserting a long section (distance), the pipe usually rotates around its axis. However, in general, when attaching a connecting member to a T-shaped tube, there is a problem in that the attaching direction of the connecting member is restricted to a certain direction. For example, when attaching an air valve as a connecting member, there is a problem in that the branch hole of the T-tube must face toward the top of the tube (directly above).

Therefore, this invention solves these problems and T
The purpose of the present invention is to provide a jig that can easily and safely rotate and correct a cross tube.

Means for Solving the Problems In order to solve the above problems, the present invention includes forming a through hole in an existing pipe through which a connecting member to a T-shaped pipe for internal insertion in the pipe-in-pipe construction method can pass, and A reaction plate is attached to the outer surface of the tube near the through hole, a shaft fixing rod in the radial direction of the T-shaped tube is attached inside the T-shaped tube, and the branch hole of the T-shaped tube and the through hole are attached to the shaft fixing rod. A pivot shaft passing through both is attached, and a jacking device is provided between the tip of the pivot shaft and the reaction plate.

Operation In the above configuration, when the jacking device is operated, the pivot shaft is rotated around the axis of the T-shaped tube, and accordingly, the T-shaped tube is also rotated around its axis. The hole can be rotated and corrected in a predetermined direction easily and safely.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In FIG. 1, 1 is an existing pipe buried underground, and a new pipe 2 is inserted into the existing pipe 1. 3 is a T-shaped tube, and a flange 5 is formed around a branch hole 4 of the T-shaped tube.

First, as shown in FIG. 1, a working hole 6 is dug from the ground at a position corresponding to the T-shaped pipe 3, and a through hole 7 is formed in the existing pipe 1 through which a connecting member such as an air valve can pass. A drill hole 8 for attaching a reaction plate is formed around the through hole 7.

Next, as shown in FIG. 2, a reaction plate 9 is attached to the outer surface of the existing pipe 1. The reaction plate 9 has a plate body 10 extending in the pipe diameter direction, and is fixed to the existing pipe 1 using the drilled hole 8 . Along with this, T
A shaft fixing rod 11 in the tube radial direction is gripped and fixed to the inner surface of the double tube 3. This shaft fixing rod 11 is arranged in a direction perpendicular to the axis of the branch hole 4.

Subsequently, as shown in FIG. 3, the pivot shaft 12 is placed so as to pass through both the through hole 7 and the branch hole 4,
The base end of this pivot shaft 12 is fitted and fixed to a pin 13 at the center of the shaft fixing rod 11. A rotational force receiving plate 14 that protrudes in the tube diameter direction is attached to the tip of the pivot shaft 12.

Therefore, a hydraulic jack 15 as a jacking device is installed between the reaction force plate 9 and the rotational force receiving plate 14, and when this hydraulic jack 15 is operated, the pivot shaft 12 is pivoted around the tube axis, and accordingly. The T-tube 3 is also rotated around its axis. Thereby, the branch hole 4 is oriented in a predetermined direction.

If the stroke of the hydraulic jack 15 and the distance between the plates 9 and 14 do not match, this can be adjusted using a spacer 16 as shown in FIG.

Once the branch hole 4 is properly oriented, the hydraulic jack 15, the pivot shaft 12, the shaft fixing rod 11, the reaction plate 9, etc. are removed, and a connecting member such as an air valve is attached to the flange 5.

Effects of the Invention As described above, according to the present invention, it is possible to easily and safely rotate and correct the branch hole position of a T-shaped pipe inserted in the pipe-in-pipe construction method.

[Brief explanation of the drawing]

FIG. 1 to FIG. 4 are diagrams showing a schematic configuration of an embodiment of the present invention and its working procedure. 1... Existing pipe, 3... T-shaped pipe, 4... Branch pipe,
7...Through hole, 9...Reaction force plate, 11...Shaft fixing rod, 12...Swivel shaft, 15...Hydraulic jack (jacket device).

Claims (1)

[Scope of Claim for Utility Model Registration] A through hole is formed in an existing pipe through which a connecting member to a T-shaped pipe for internal insertion in the pipe-in-pipe construction method can pass, and a reaction plate is provided on the outer surface of the existing pipe near the through hole. and attaching a shaft fixing rod in the radial direction of the T-shaped tube in the T-shaped tube, and attaching a pivot shaft passing through both the branch hole of the T-shaped tube and the through hole to the shaft fixing rod, and A rotation correction jig for a T-shaped tube, characterized in that a jacking device is provided between the tip of the pivot shaft and the reaction plate.