JPH03288080A - Existing conduit removing and enlarged conduit laying method and device therefor - Google Patents

Abstract

PURPOSE:To allow the removal of an existing conduit and the laying of an enlarged conduit to be performed simultaneously with safety and efficiency by providing the tip of an enlarging shield machine with natural ground drilling outer cutters and existing conduit cutting/removing inner cutters controlled separately from the outer cutters. CONSTITUTION:An enlarging shield machine 10 is provided, at its tip, with natural ground drilling outer cutters 11 and inner cutters 13, controlled separately from the outer cutters 11, for cutting/removing an existing conduit 12 so as to lay a new enlarged conduit in a tunnel drilled/enlarged by the outer cutters 11. A stable working face is thereby provided without pulling down the natural ground, and the removal of the existing conduit and the laying of the enlarged conduit can be performed simultaneously with safety and efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method and apparatus for removing an existing pipe and simultaneously installing a new expanded pipe.

<Prior art> A known device for removing an existing pipe and laying a new expanded pipe at the same time includes an outer peripheral bit installed near the outer periphery of a rotary cutter board for excavating the ground; In order to cut and remove the existing pipe conduit, it is equipped with an inner circumferential bit provided on the inner center side of the outer circumferential bit. However, in this device, the outer bit for excavating the ground and the inner bit for cutting the existing pipe are installed on the same rotary cutter disk, so the inner bit has a high cutting resistance. Despite the fact that the side bits delay digging, the outer bits have the drawback of unnecessarily repeatedly excavating the ground, disturbing the ground, making the face unstable, and causing safety problems.

In addition, because the cut surface of the existing pipe and the excavated surface of the ground are on the same plane, in fluid ground, earth and sand and groundwater may flow into the cutter board's voids, causing the ground to collapse. .

<Problem to be solved by the invention> The purpose of the present invention is to stabilize the face without disturbing the ground.
An object of the present invention is to provide a safe and efficient method and device for simultaneously removing an existing pipe and installing an expanded pipe.

Further, according to the present invention, it is an object of the present invention to provide a method and apparatus for simultaneously removing an existing pipe and installing an expanded pipe without causing the possibility of ground collapse even in fluid ground. shall be.

Means for Solving the Problems> According to the method of the present invention, first, an outer cutter excavates the ground, and at the same time, an inner cutter that is controlled separately from the outer cutter cuts and removes the existing pipe. Next, a new enlarged culvert is laid in the tunnel excavated and enlarged by the outside cutter.

Further, according to the present invention, an existing pipe culvert is provided with an outer cutter for excavating the ground, and an inner cutter that is controlled separately from the outer cutter in order to simultaneously cut and remove the existing pipe culvert. An excavating and cutting device is provided for simultaneously removing the tunnel and excavating the enlarged tunnel.

<Example> An example of the present invention will be described below with reference to the accompanying drawings.

The expansion shield machine 10 is equipped with an outer cutter 11 for excavating the ground and an inner cutter 13 for cutting the existing pipe culvert 12 at its tip. The outer cutter 11 is the motor 1
4, while the inner cutter 13 is rotated by a separately controlled motor 15. As shown in the figure, the outer cutter 11 is disposed protrudingly in front of the inner cutter 13 for forward excavation of the ground.
3 cuts the pipe 12 backwards. A sealing member 16 is attached to the inner peripheral surface of the outer cutter 11 in the gap between the pipe culvert 12 and the outer cutter 11, and the expansion shield machine 10 is attached when excavating the ground.
Prevents earth, sand and groundwater from entering the inside of the face and maintains the stability of the face.

During excavation, in order to excavate the ground while maintaining the face, mud is forced into the ground excavation chamber 18 through a pipe 17 in the direction of the arrow X, and is discharged from the pipe 19 in the direction of the arrow Y according to the amount of excavated waste. . As the excavation of the earth progresses, the front barrel propulsion jack 20°21 is engaged to advance the front barrel 22. The reaction force of the front fuselage propulsion jack 20.21 is applied to the rear fuselage 2 as shown in the figure.
3. On the other hand, the debris 24 of the pipe 12 cut by the inner cutter 13 is conveyed out by a belt conveyor 26 through a chute 25. According to the cutting of the pipe 12, the rear trunk 2 is moved by the rear trunk propulsion jack 27.28.
Advance 3. The reaction force of the rear fuselage propulsion jacks 27, 28 can be obtained by the installed segments 29. The excavation speed of the outer cutter 11 and the cutting speed of the inner cutter 13 are synchronized by separately controlling the rotational speed of the motors 14 and 15, respectively. Even if there is a slight discrepancy between the digging speed of the outer cutter 11 and the cutting speed of the inner cutter 13, the front barrel 22
and the rear body 23 can be advanced separately, so they can be complemented by adjusting the motors 14, 15 accordingly.

In this embodiment, the outer cutter 1↓ is installed in the front body 22 and the inner cutter 13 is installed in the rear body 23 so that they can slide against each other. It is also possible to have a structure that allows the part to slide inside the machine (body part).

Effects> According to the present invention, a stable face is provided without disturbing the ground, and it is possible to safely and efficiently remove an existing pipe and install an expanded pipe at the same time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a portion of an excavating and cutting device for simultaneously removing an existing pipe and excavating an enlarged tunnel according to the present invention. 11...Outer cutter, 12...Existing pipe culvert, 13...Inner cutter, 16...Seal member.

Claims (1)

[Claims] 1) An outer cutter excavates the ground, and at the same time an inner cutter that is controlled separately from the outer cutter cuts and removes the existing pipe, and the outer cutter excavates and enlarges the tunnel. A method for removing an existing pipe and installing an expanded pipe, characterized by laying a new expanded pipe in the area. 2) A claim characterized in that the gap between the existing pipe culvert and the outer cutter is sealed, the outer cutter excavates the ground forward, and then the inner cutter moves backward to cut and remove the existing pipe. The method described in Section 1. 3) Existing culvert removal and expansion tunnel, characterized by comprising an outer cutter for excavating the ground and an inner cutter that is controlled separately from the outer cutter to simultaneously cut and remove the existing culvert. An excavating and cutting device for simultaneously performing excavation. 4) In order to excavate the ground forward and cut the existing pipe conduit backward at the same time, the outer cutter is arranged to protrude forward with respect to the inner cutter, and the gap between the existing pipe pipe and the outer cutter is sealed. 4. The excavating and cutting apparatus according to claim 3, further comprising a sealing member attached to said outer cutter.