JP2585027B2 - Underground pipe replacement method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for renewing an underground pipe such as an urban sewer pipe.

(Prior art) Recently, there is an increasing demand for replacing underground pipes such as sewer pipes that have become obsolete or have a shortage of sections in cities, and accordingly, new and old underground pipes are efficiently replaced. Research and development of construction methods are being conducted in various fields.

Instead of the open cut method, a method has been developed in which old pipes are destroyed and removed underground, and new pipes are laid in their tracks.

(Object of the Invention) It is an object of the present invention to provide an underground buried pipe renewal method capable of performing a new and old underground pipe replacement work more efficiently without stopping the use of the old pipe in accordance with the above trend. It is in.

(Structural Features of the Invention) A structural feature of the underground pipe replacement method of the present invention is that the front part of the shield is extrapolated to the end of the old pipe, and the old pipe is inserted inside the front part of the shield. The shield is advanced while crushing or cutting the end and discharging the crushed pieces or cut pieces backward through the inside of the shield. When laying a new pipe at the removal site of the old pipe, advance remotely into the old pipe The point is that the leading shield is inserted, and the water in the old pipe is sucked by the water suction pump attached to the leading shield and is removed to the rear.

(Detailed Description of the Invention) In Fig. 1 which is an explanatory view of one embodiment of the method of the present invention, 1 is an old pipe made of a plain concrete pipe, 2 is a shield, and 3 is a new pipe made of a fume pipe. The new pipe 3 has a larger diameter than the old pipe 1.

The cutting edge 4 of the shield 2 is rotatably supported by the rear trunk 5, and the cutter head 6 at the tip thereof has a donut shape. The inner partition 7 has a plurality of roller cutters 8 spaced apart in the circumferential direction. The roller cutter 8 comes into contact with the end face of the old pipe 1 when the cutting edge 4 of the shield 2 is extrapolated to the end of the old pipe 1 as shown in the figure.

A screw conveyor 9 is provided inside the shield 2. A screw shaft 11 rotated by a motor 10 is in the air, and its front end is integrally connected to the partition 7.
The rear end is a tube that extends behind shield 2 via swivel 12.
Connected to 13.

While pushing the new pipe 3 against the rear end of the rear body 5 of the shield 2 with a propulsion jack (not shown) from behind, operating the motor 10 to rotate the blade opening 4 of the shield 2, The head 6 excavates earth and sand outside the end of the old pipe 1, and the roller cutter 8 crushes the end of the old pipe 1 inside the cutting edge 4, so that the shield 2 moves forward.

In this way, the new pipes 3 are successively added while the shield 2 is advanced, whereby the new pipes 3 are laid at the trace of the old pipes 1 and the underground pipes are renewed.

The excavated soil and crushed material at this time enter the screw conveyor 9 from the entrance 14 and are sent to the rear, and exit from the outlet 15, so that they may be sent further backward by means such as a belt conveyor and discharged to the ground. .

Reference numeral 16 denotes an arcuate cylinder for bending the shield 2 at a curve, and reference numeral 17 denotes a gate jack for opening and closing the discharge port 15.

Continuing the description, a flexible tube 19 is connected to the front end of the screw shaft 11 via a swivel 18, and the front end of the tube 19 is a sealing wall 21 on the entire surface of the leading shield 20 placed in the old pipe 1. A water suction pump 22 is attached to the tip of the old pipe. The water in the old pipe 1 is sucked by the water suction pump 22 and flows backward through the tube 19, the screw shaft 11, and the pipe 13. 1 can be used to update the underground pipe.

The leading shield 20 is divided into two parts at the front and rear, and a hydraulically operated gripper 23 is provided at a rear part thereof, and a front part and a rear part thereof are connected by a hydraulically operated propulsion jack 24. By repeating the projecting / retracting operation of the propulsion jack 24 and the expanding / contracting operation of the propulsion jack 24, the device can be advanced in a worm-like manner, and the operation is performed by externally controlling a hydraulic unit.

FIG. 2 is an explanatory view of another embodiment of the method of the present invention,
In this case, the old pipe 1 'is reinforced with a ferrous material, the new pipe 3' is formed in situ, and the new pipe 3 'shown in FIG.
Larger diameter.

The shield 2 'is composed of a cutting edge 25, girder 26 and tail
27, and the donut-shaped cutting edge 25 is a motor 28
, And the cutting face is subjected to muddy water pressure so that the cuttings of the entire cutter 29 of the cutting edge 25 are discharged by a muddy pipe 30.

An ultra-high pressure jet device 31 is provided inside the girder portion 26 and is movable in the front-rear direction and the circumferential direction, respectively.

With the front part of the shield 2 ′ extrapolated to the end of the old pipe 1 ′ as shown in the figure, the cutting edge 25 is rotated to cut the earth and sand outside the end of the old pipe 1 ′. 2 'is advanced by the operation of the propulsion jack 32. During this time, the end of the old pipe 1' entering the inside of the girder portion 26 is cut into an appropriate size by the jetting device 31, and the cut pieces are removed by appropriate discharging means. In this case, the erector 33 can be used for holding the cut portion and discharging the cut piece.

Although the new pipe 3 'is formed in-situ behind the shield 2' by direct molding of concrete using the formwork 34 in the case shown in the figure, a conventional segment method may of course be used.

In the case of FIG. 2, as in the case of FIG. 1, the leading shield 20 'is inserted into the old pipe 1', and the water in the old pipe 1 'is discharged backward through the tube 19'. The front shield 20 ′ has a laser beam reflector 35 on the back.
And a laser beam is projected from the light source 36 on the shield 2 side to obtain information on the traveling direction of the shield 2.

The two embodiments of the method of the present invention have been described above, but it goes without saying that the present invention is not limited to this.

(Effects of the Invention) According to the construction method of the present invention, particularly, a leading shield which advances by remote control is put in the old pipe, and the suction pipe attached to the leading shield sucks the inside of the old pipe and removes it behind, so that the new pipe is replaced. There is an advantage that not only can the construction be performed more efficiently without stopping the use of the old pipe, but also that the leading shield can be used to acquire information on the traveling direction of the shield for the main construction.

[Brief description of the drawings]

FIG. 1 is a sectional view for explaining one embodiment of the method of the present invention, and FIG.
The figure is a cross-sectional view for explaining another embodiment. In the figure, 1,1 ': old pipe, 2,2': shielded, 3,3 ': new pipe, 2
0,20 ': preceding shield, 22: water absorption pump.

Claims (1)

(57) [Claims] 1. A front part of a shield is extrapolated to an end of an old pipe, and an end of an old pipe is crushed or cut inside a front part of the shield. While discharging, advance the shield, and when laying a new pipe at the removal site of the old pipe, insert a preceding shield that advances by remote control into the old pipe, and use the water absorption pump attached to the preceding shield to remove water in the old pipe. Underground buried pipe renewal method characterized by removal to the rear.