JP2647691B2 - Method and apparatus for laying underground pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for laying underground pipes, such as renewal of aging sewer pipes, and an apparatus used therefor.

[Conventional technology]

Conventionally, as a method of replacing existing pipes, an open-cutting method that cuts old pipes and replaces new pipes has been applied.However, this method has a defect that replacement traffic jams and problems such as loosening of the ground are likely to occur. .

 For this reason, various construction methods have been devised that do not rely on digging.

The first is a so-called pipe-in-pipe method in which a pipe having a size one size smaller than the existing length is inserted. However, in this method, the diameter of the new pipe is smaller than the diameter of the existing pipe, the flow rate is reduced, and in the case of sewer pipe, the pipe bottom height is increased, which may cause problems in relation to the front and rear pipes There is.

Further, as a method of preventing the occurrence of this problem, a method of crushing such as expansion crushing and compression crushing in which an old pipe is expanded and crushed and a new pipe is installed after that is disclosed in Japanese Patent Laid-Open No. 62-112830. These are disclosed in Japanese Unexamined Patent Publication No. Sho 62-125197, Japanese Unexamined Patent Publication No. Sho 62-146395, Japanese Unexamined Patent Publication No. Sho 62-21992, and the like.

Also, an extrusion method and a pulling method in which an existing pipe is extruded with a new pipe or pulled out from the other end are described in JP-A-62-137486, JP-A-62-112894, JP-A-62-35188, It is disclosed in JP-A-62-25697.

Furthermore, there is a construction method of excavating around a buried pipe as described in JP-A-62-194396, and a method of turning the inner surface of a buried pipe as described in JP-A-61-290125. .

[Problems to be solved by the invention]

However, when the above-mentioned crushing method is applied, concrete is reinforced with steel and the connection collar is made of steel, so it cannot be easily crushed, and the impact force causes vibration pollution. There is fear.

In the extrusion method and the traction method described above, the frictional force between the soil and the pipe is extremely large due to long-term burial, and there is a problem with the place where the reaction force is taken and the strength of the pipe. However, noise and vibration are generated, which is not preferable.

The problem to be solved in the present invention is to solve the problems of the conventional construction method when replacing an underground pipe, and to replace a buried pipe having a connection collar in addition to a reinforced concrete pipe, a ceramic pipe, a PVC pipe, and the like. It is an object of the present invention to complete a construction method that can be performed without causing any damage to the surrounding area.

[Means for solving the problem]

The underlaying of the underground pipe of the present invention is performed by using a device in which a rotary drive device is provided inside a cylindrical pipe propelled by a propulsion device and a plurality of disk cutters are attached to the outer periphery of the cylindrical pipe. After cutting the tube in the axial direction from the inside of the tube and releasing the tube from the earth pressure, insert a cylindrical tube that fits into the inside diameter of the tube to prevent the collapse of the cut tube, and then match the outside diameter of the cylindrical tube The cylindrical pipe is pushed out to the other end by a temporary pipe having a diameter, and then the temporary pipe is replaced with a new pipe, thereby solving the above problem.

〔Example〕

1 to 3 are views showing a mounting mode of the diamond disc cutter 3 and a drive mechanism, FIG. 1 is a view showing a vertical cross-sectional structure of a tip portion, and FIG. −
It is the front view seen from the direction of the II line. FIG. 3 is a diagram showing details of the cutter driving unit.

Referring to these figures, reference numeral 3 denotes a diamond disk cutter for cutting the existing pipe 1 from the inner surface in the longitudinal direction thereof. Reference numeral 4 denotes a leading pipe for supporting the diamond disk cutter 3, which has a hole diameter slightly smaller than the inner diameter of the existing pipe 1. As shown in FIG. 2, a plurality of diamond disc cutters 3 are mounted on the peripheral edge of the leading end of the leading pipe 4 with their blades protruding, and the tip of the cutter 3 projects slightly from the outer diameter of the existing pipe 1. Is set to The cutter 3 is mounted in the leading conduit 4 and has a structure driven to rotate via bevel gears 7 and 8 by a hydraulic motor 2 having a power source outside.

Further, a cylindrical pipe 6 is connected to the rear part of the front pipe 4 by bolts 5.

4 to 6 are views showing an embodiment of the method of the present invention in the order of steps.

First, in FIG. 4 showing the cutting state of an existing pipe by a small-diameter thruster and a cutter, reference numeral 1 denotes an existing pipe laid between a manhole 9 on the starting side and a manhole 10 on the arrival side. Reference numeral 11 denotes a starting casing built near the starting manhole 9.

First, when replacing the existing pipe 1, a small-diameter thruster 12 having the diamond disc cutter 3 attached to the tip thereof is installed in the starting casing 11, and the diamond disc cutter shown in FIGS. 3 is driven to rotate. As the small-diameter thruster 12, it is preferable to use a thruster disclosed by the present applicant in Japanese Patent Application Laid-Open No. 62-258097. The bottom of the manhole 10 on the reaching side is preferably slightly dug 13 so that it can be easily worked.

Then, the existing pipe 1 is divided into a plurality of pieces in the axial direction while the front pipe 4 having the diamond disc cutter 3 attached thereto is propelled by the propulsion device 12.

With the progress of cutting by the cutter 3, the cut existing pipe 1 is released from the earth pressure, and the leading pipe 4 is cut off the existing pipe 1
Is propelled in the existing pipe 1 in a state of fitting into the inside of the pipe. Along with the progress, the existing pipe 1 between both manholes 9 and 10 is cut while connecting the subsequent cylindrical pipe 6 in the starting casing 11 as shown in FIG.

Next, when the entire length of the existing pipe 1 has been cut by the tip cutter 3 of the leading pipe 4 and the manhole 10 has been reached, as shown in FIG.
A push plate 14 having a diameter substantially equal to the outer diameter of the existing pipe 1 is arranged, and a temporary pipe 15 having substantially the same diameter as the existing pipe 1 is connected thereto and is applied to the rear end of the existing pipe 1 cut. The temporary pipe 15 is propelled by the small-diameter thruster 12, and the existing pipe 1 divided and cut by the cutter 3 is pushed into the reaching manhole 10 by the push plate 14 and taken out to the ground.

Further, when the push of the existing pipe 1 by the push plate 14 is completed and the leading end of the temporary pipe 15 reaches the reaching manhole 10, the new pipe 16 is propelled from the work casing 11 using the propulsion device 12, and the temporary pipe 15 is After replacement, the exchange with the existing pipe 1 is completed.

〔The invention's effect〕

 According to the present invention, the following effects can be obtained.

(1) Even buried pipes such as reinforced concrete pipes, porcelain pipes, PVC pipes, etc., which were difficult with the conventional construction method, can be easily replaced and replaced because they can be divided and cut by a cutter.

(2) Since a large reaction force is not required for replacement, a special propulsion machine is not required, and a conventional small-diameter propulsion machine can be used.

(3) The existing pipe is extruded in a state where the cored cylindrical pipe is fitted and supported in the cut existing pipe, so that the buried pipe with severe corrosion and damage can be extruded smoothly without buckling. Simple replacement laying is possible.

(4) There is no generation of noise due to vibration and the like.

(5) Since the existing pipe is cut in the axial direction, it is easy to extract the cut pieces, and no special equipment for taking out the cut pieces is required.

[Brief description of the drawings]

FIGS. 1 to 3 show the manner of mounting the diamond disc cutter and the drive mechanism. 4 to 6 are views showing an embodiment of the method of the present invention in the order of steps. 1: Existing pipe, 2: Hydraulic motor 3: Diamond disc cutter 4: Lead pipe, 5: Bolt 6: Cylindrical pipe, 7: Bevel gear 8: Bevel gear, 9: Manhole 10: Manhole, 11: Caging 12: Small diameter Propulsion machine, 13: digging 14: push plate, 15: temporary pipe 16: new pipe

Claims (2)

(57) [Claims] An underground pipe is cut vertically from the inside of one end of the pipe toward the other end, and then the cylindrical pipe having a hole diameter slightly smaller than the inner diameter of the underground pipe is cut and cut. Inserted into the middle buried pipe, and subsequently extruded the underground buried pipe divided and cut together with the cylindrical pipe by a temporary pipe having the same diameter as the underground buried pipe to the other end. How to replace underground pipes to replace the underground pipe. 2. An underground pipe laying apparatus in which a rotary drive device is provided inside a front pipe propelled by a propulsion device, and a plurality of disk cutters are mounted on the outer circumference of the front pipe.