JP2001124242A - Method for removing buried pipe, and method for replacing buried pipe with new pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method which can simplify the structure of a pipe jacking machine, improve the workability and remove a buried pipe. SOLUTION: In the method for removing the buried pipe, two shafts 22 and 24 to be connected to the buried pipe 20 are formed, and the pipe jacking machine 30 is installed in one shaft 24. Then, a feeder screw 34 is connected to the pipe jacking machine, and inserted in the buried pipe, and pushed out toward the other shaft 22. When the feeder screw reaches the shaft 22, the pushing-out of the feeder screw is stopped, and a pulverizing head 36 is connected to the feeder screw. The feeder screw is drawn while rotating the pulverizing head and the feeder screw, the buried pipe is pulverized, and pulverized pieces thereof are led to the shaft 24 having the pipe jacking machine by the feeder screw and the buried pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for removing a buried pipe buried underground and a method for replacing a buried pipe with a new pipe.

[0002]

2. Description of the Related Art Underground pipes such as fume pipes and concrete pipes having a rectangular cross section called box culverts are susceptible to cracks or sewage drainage over time after being buried. The inner peripheral surface of a buried pipe may be corroded. In this case, even by attaching a corrosion-resistant plastic sheet or the like to the inner peripheral surface, it is possible to prevent water leakage due to cracks and to improve flow obstruction due to corrosion. On the other hand, attaching a plastic sheet to the inner peripheral surface of the buried pipe reduces the effective cross-sectional area for the flow, which is not preferable from the viewpoint of securing the flow rate. In addition, it is impossible to attach a plastic sheet to a small-diameter buried pipe that cannot be entered by a person.

[0003] In view of the above, a method of crushing and removing a buried pipe and leading a new pipe to the removed location has also been implemented. In this conventional method, the crushing head is pushed out toward the buried pipe while rotating a feeder screw having a crushing head at the head by a propulsion device, and a new pipe arranged so as to surround the feeder screw follows the crushing head. Let's promote it.

[0004]

In the conventional method, when a screw feeder or a screw conveyor is formed by a feeder screw and a new tube and crushed pieces are taken out by the screw conveyor, the inner peripheral surface of the new tube is damaged. Because of this, an independent trough was arranged inside the new pipe, and a screw conveyor was formed by the trough and the feeder screw. As a result, there is a double structure of the trough and the new pipe surrounding the feeder screw, and the structure of the propulsion device for simultaneously propelling these is complicated. In addition, workability has been reduced by interposing a trough that is unnecessary for propelling the new pipe into the ground.

The present invention provides a method for removing a buried pipe, which can simplify the structure of a propulsion device and improve workability.

The present invention also provides a method of replacing a buried pipe with a new pipe, which can simplify the structure of a propulsion device and improve workability.

[0007]

SUMMARY OF THE INVENTION The present invention is a method for removing a crushable underground pipe in the ground. First, a first shaft and a second shaft connected to the buried pipe are formed at intervals in the axial direction of the buried pipe. Next, a propulsion device having an extrudable, pullable, and rotatable operating part is installed in one of the first shaft and the second shaft. Thereafter, a feeder screw is connected to the operating part of the propulsion device, inserted into the buried pipe, and extruded toward the other of the first shaft and the second shaft. When the feeder screw reaches the other of the first shaft and the second shaft, the extrusion of the feeder screw is stopped and a crushing head is connected to the feeder screw. And while rotating the crushing head and the feeder screw, pull out the feeder screw to crush the buried pipe by the crushing head, and crush the crushed pieces by the feeder screw and the buried pipe to the thruster. Lead to a certain shaft.

[0008] The dimensions of the feeder screw are determined so that when the feeder screw is inserted into the buried pipe, a clearance of an appropriate size is formed between the feeder screw and the inner peripheral surface of the buried pipe. Then, the buried pipe becomes a trough, and a screw conveyor is formed.

When the feeder screw is pulled toward the propulsion device while rotating the crushing head and the feeder screw, the buried pipe is crushed by the crushing head, and the crushed crushed pieces are screw-conveyed by the feeder screw and the buried pipe. Is led to the shaft with the propulsion device.

The propulsion device can be pushed out, pulled out,
In addition, any structure having a rotatable operating portion may be used, which is the simplest structure as a propulsion device.

Since the buried pipe itself is used as a trough of the screw conveyor, there is no need to separately provide a trough for removing the crushed buried pipe, thereby improving workability.

The feeder screw is guided by the buried pipe when it is pushed into or out of the buried pipe, so that the feeder screw can be reliably guided without providing a special guide mechanism or guide mechanism. In addition, the crushing head is contacted with the end of the buried pipe by the pulling force, and is operated by so-called pulling. It is empirically known that the directionality is better than the self-acting operation. From the above two points, the crushing of the buried pipe by the crushing head can be accurately advanced in the axial direction of the buried pipe.

The present invention is also a method for replacing a crushable underground pipe with a new pipe. First, a first shaft and a second shaft connected to the buried pipe are formed at intervals in the axial direction of the buried pipe. Then, a propulsion device having an extrudable, pullable, and rotatable operating part is installed in one of the first shaft and the second shaft. Thereafter, a feeder screw is connected to the operating part of the propulsion device, inserted into the buried pipe, and extruded toward the other of the first shaft and the second shaft.

In one aspect, when the feeder screw reaches the other of the first shaft and the second shaft, the extrusion of the feeder screw is stopped, and a crushing head is connected to the feeder screw. A new tube is connected to the crushing head. Then, while rotating the crushing head and the feeder screw, the feeder screw is pulled out, the buried pipe is crushed by the crushing head, and the crushed pieces are crushed by the feeder screw and the buried pipe. A new shaft is led to a certain shaft, and the new tube is led to the crushed buried pipe.

Since the method of removing the buried pipe is basically used, the above-described functions and effects can be obtained. In addition, the new pipe is connected to the crushing head, and the new pipe is guided to the crushed buried pipe by pulling out the feeder screw.Since the crushing of the buried pipe proceeds accurately in the axial direction of the buried pipe, The tube can be accurately positioned and replaced with a buried tube.

Since the crushing of the buried pipe and the guiding of the new pipe to the portion of the crushed buried pipe are performed simultaneously, the workability can be improved.

In another aspect of the invention, when the feeder screw reaches the other of the first shaft and the second shaft, the extrusion of the feeder screw is stopped, and a crushing head is connected to the feeder screw. afterwards,
While pulling out the feeder screw while rotating the crushing head and the feeder screw, the buried pipe is crushed by the crushing head, and the crushed crushed pieces are separated by the feeder screw and the buried pipe into a shaft with the thruster. Lead to. Then, the new pipe is pushed out to a portion of the crushed buried pipe by a second propulsion device having an extrudable operating part, which is installed in the other of the first shaft and the second shaft.

Since the method for removing the buried pipe is basically used, the above-described functions and effects can be obtained.

Since the crushing of the buried pipe and the guiding of the new pipe to the portion of the crushed buried pipe are performed by separate propulsion devices, the capacity of each propulsion device can be set low.

The present invention is also a method for replacing a crushable underground pipe with a new pipe. First, an upstream shaft and a downstream shaft connected to the buried pipe are formed at intervals in the axial direction of the buried pipe. Prior to, in parallel with, or after making these shafts, a bypass pipe is used to connect the portion of the buried pipe upstream of the upstream shaft and the portion of the buried pipe downstream of the downstream shaft. Connect with. Then, a propulsion device having an extrudable, pullable, and rotatable operating part is installed in one of the upstream shaft and the downstream shaft. Thereafter, a feeder screw is connected to the operating part of the propulsion device, inserted into the buried pipe, and extruded toward the other one of the upstream shaft and the downstream shaft. When the feeder screw reaches the other of the upstream shaft and the downstream shaft, the extrusion of the feeder screw is stopped, a crushing head is connected to the feeder screw, and the new pipe is connected to the crushing head. I do. Then, while pulling out the feeder screw while rotating the crushing head and the feeder screw, the buried pipe is crushed by the crushing head, and the crushed pieces are crushed by the feeder screw and the buried pipe. The new pipe is led to a shaft, and the new pipe is led to a crushed buried pipe.

The present invention is suitable when water is flowing in the buried pipe. For example, in a site such as a large-scale redevelopment, the buried pipe can be replaced with a new pipe while water stops flowing into the buried pipe. Can not be stopped. Therefore, a portion of the buried pipe upstream of the shaft on the upstream side and a portion of the buried pipe downstream of the shaft on the downstream side are connected by a bypass pipe, and water flows through the bypass pipe.

The same operation and effect can be obtained as in the above-mentioned method of replacing the buried pipe with the new pipe, which is performed by connecting the crushing head to the feeder screw and connecting the new pipe to the crushing head. In addition, buried pipes can be replaced with new pipes even at sites where daily life is continuing.

In another aspect of the invention, the buried pipe has two working holes connected to the ground, and the upstream shaft and the downstream shaft are modified from the working holes.

A work hole called a manhole is, for example, 50
Since the manholes are installed in the buried pipes at intervals of -100m, if this manhole is modified to make a shaft, the workability when making the shaft can be improved.

In still another invention, after the crushing head reaches the shaft with the propulsion device, the crushing head, the feeder screw and the propulsion device are removed from the shaft.

The crushing head, feeder screw and thruster can be removed from the shaft and transported to another shaft to prepare for the next operation.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for removing a crushable underground pipe 20 according to the present invention, as shown in FIG. 1, is connected to the buried pipe 20 at intervals in the axial direction of the buried pipe 20. A first shaft 22 and a second shaft 24 are formed.

The buried pipe 20 is a concrete pipe called a fume pipe or a box culvert, and is easily crushed as compared with, for example, a steel pipe. The sectional shape of the buried pipe 20 is usually
It is circular or nearly square. When the buried pipe 20 is used for sewage, the drainage from the wastewater basin 26 is
A drain pipe 28 leading to zero is appropriately connected. Sewage basin 2
6 receives sewage from home or business. Two shafts 2
2 and 24 are made by a method known per se, which is implemented in a pipe propulsion method.

After the two shafts 22 and 24 are formed, as shown in FIG. 3, one of the first shaft 22 and the second shaft 24 has an extrudable, pullable and rotatable operating part 32. Is installed. In the illustrated embodiment, the shaft 24 is located downstream of the shaft 22, and the thruster 30 is installed in the shaft 24 on the downstream side.

After the propulsion device 30 is installed, the feeder screw 34 is connected to the operating portion 32 of the propulsion device 30 to connect the buried pipe 2
0 and extruded toward the other of the first shaft 22 and the second shaft 24. In the illustrated embodiment, a feeder screw 34 is extruded from the shaft 24 toward the shaft 22 as shown by an arrow A. When extruding the feeder screw 34, it is not necessary to rotate the feeder screw 34.

The feeder screw 34 has helical blades 35. When the lower blade portion is placed on the inner peripheral surface 21 of the buried pipe 20, appropriate clearances are formed on the left and right sides and the upper side. It is preferable to determine the dimensions so that a screw conveyor can be formed by the buried pipe 20 and the feeder screw 34.
When the cross-sectional shape of the buried pipe 20 is substantially square, the dimension between the feeder screw 34 and the approximate center of each side of the square becomes the minimum, and the dimension between the corner and the feeder screw 34 becomes the maximum. The dimensions should be such that the minimum dimensions are suitable for forming a screw conveyor.

When the buried pipe 20 and the feeder screw 34 are defined in such a dimensional relationship, the blades of the feeder screw 34 are mounted on the inner peripheral surface 21 of the buried pipe 20 to support and extrude the feeder screw 34. Since the feeder screw 34 is guided by the buried pipe 20 at the time of pulling out or pulling out, no special device for supporting and guiding is required.

The operating portion 32 of the propulsion device 30 operates within a predetermined stroke range. Therefore, in order to push out the feeder screw 34 beyond this stroke, in other words, when the entire length of the buried pipe 20 is longer than the stroke of the operating portion 32, the feeder screw 34 is set to have substantially the same length as the stroke of the propulsion device 30. Formed with a considerable number of unit screws. When the one-stroke extrusion by the propulsion unit 30 is completed, the unit screw preceding in the buried pipe 20 is retained at that position, the operating unit 32 of the propulsion unit 30 is returned to the stroke start position, and a new unit screw is inserted. It is connected to the unit screw and the operating part 32 and pushed out sequentially.

The feeder screw 34 is connected to the first shaft 22
And when the second shaft 24 is reached, the extrusion of the feeder screw 34 is stopped, and the crushing head 36 is connected to the feeder screw 34. In the embodiment shown in FIG. 4, when the tip of the feeder screw 34 reaches the shaft 22 on the upstream side, the extrusion of the feeder screw 34 is stopped, and the crushing head 36 is connected to the tip of the feeder screw 34. . The crushing head 36 is mounted on the buried pipe 20.
Has a cutter on the side facing.

The crushing head 36 is connected to the feeder screw 34
Then, while rotating the crushing head 36 and the feeder screw 34, as shown in FIG. 5, the feeder screw 34 is pulled out toward the arrow B, that is, toward the shaft 24, and the buried pipe 20 is pulled by the crushing head 36. While crushing, the crushed pieces are
And the buried pipe 20 lead the shaft to the shaft 24 where the propulsion device 30 is located.

As described above, the feeder screw 3
4 and the buried pipe 20 form a screw conveyor. That is, since the buried pipe 20 functions as a fixed trough, the feeder screw 34 inside the trough is used.
Is rotated, the crushed pieces are moved by the action of the spiral blades 35 and the troughs on the feeder screw 34 so that the shaft 24
Move towards. Therefore, the crushed pieces of the buried pipe 20 can be collected in the shaft 24 and can be carried out of the shaft 24.

The total length of the feeder screw 34 is
0, the stroke is longer than one stroke of the operating part 32, and the unit screw is removed by pulling out the feeder screw 34 by one stroke of the operating part 32, contrary to the pushing.
This is repeated until the crushing head 36 reaches the shaft 24. Since the crushing head 36 comes into contact with the end face of the buried pipe 20 by itself and crushes the buried pipe 20, crushing proceeds favorably over the entire length of the buried pipe 20.

In the above description, the shaft 24 is on the downstream side, and the propulsion device 30 is installed in the shaft 24 to push out the feeder screw 34 toward the shaft 22 on the upstream side, and the feeder screw 34 reaches the shaft 22. At this time, the extrusion is stopped and the crushing head 36 is connected to the feeder screw 34.
And the feeder screw 34 is connected to the shaft 24 on the downstream side.
I'm pulling out for Conversely, the propulsion device 30 is installed in the shaft 22 on the upstream side, and the feeder screw 34 is pushed out toward the shaft 24 on the downstream side. When the feeder screw 34 reaches the shaft 24, the extrusion is stopped and crushing is performed. The head 36 can be connected to the feeder screw 34, and the feeder screw 34 can be pulled out toward the shaft 22 on the upstream side. The same applies to the invention described below.

The basic invention of the present application is as described above. Various inventions are established in addition to the basic invention. Next, this will be described.

The method of replacing the crushable underground pipe 20 with a new pipe is to form a first shaft 22 and a second shaft 24 connected to the buried pipe 20 at intervals in the axial direction of the buried pipe 20. , One of the first shaft 22 and the second shaft 24, the extrudable, withdrawable and rotatable operating part 3
2 and a feeder screw 3
4 is connected to the operating portion 32 of the propulsion device 30 and inserted into the buried pipe 20 and pushed out toward the other of the first shaft 22 and the second shaft 24, and the feeder screw 34 is moved to the first shaft 22 and the second shaft 22. When reaching the other end of the shaft 24, the extrusion is stopped and the crushing head 36 is moved to the feeder screw 34.
Connect to Up to this point, it is the same as the above-mentioned invention.

The crushing head 36 is connected to the feeder screw 34
After or prior to the connection, the new tube 40 is connected to the crushing head 36 as shown in FIG. The new pipe 40 is a fume pipe, a steel pipe or a plastic pipe,
It is preferable that the unit pipe is formed of a unit pipe having a length substantially equal to one stroke of the zero operation unit 32. The required length is obtained by connecting these unit pipes.

After the crushing head 36 and the new tube 40 are connected to the feeder screw 34, the crushing head 36 and the feeder screw 34 are rotated while the feeder screw 3 is rotated.
4 is pulled out as indicated by an arrow B, and the buried pipe 20 is crushed by the crushing head 36.
The buried pipe 20 is replaced with the new pipe 40 by guiding the new pipe 40 to the crushed buried pipe portion. At this time, the crushing head 36 and the feeder screw 34 are always rotated, but the new pipe 40 may be rotated or non-rotated.

The total length of the feeder screw 34 is
If the operation section 32 is longer than one stroke, the feeder screw 34 is pulled out by one stroke, the unit screw is removed in the shaft 24, and the unit pipe is connected to the already propelled unit pipe in the shaft 22, and the feeder screw is again turned on. Pull out 34. New tube 40 is shaft 2
The above operation is repeated until the number reaches 4. It is preferable that the new pipe 40 be supported on the guide table 42 in the shaft 22, and that the tailstock 44 be movable along the guide table 42.
It is preferable that the end of the new tube 40 be supported by this to prevent the deflection of the new tube 40.

Another method of replacing the crushable underground pipe 20 with a new pipe is the same as that of the above-described invention until the crushing head 36 is connected to the feeder screw 34.
After the crushing head 36 is connected to the feeder screw 34, the crushing head 36 is pulled out while rotating the crushing head 36 and the feeder screw 34, and the buried pipe is crushed by the crushing head 36. The buried pipe 20 guides the shaft to a shaft 24 having a propulsion device 30.

On the other hand, the first shaft 22 and the second shaft 24
Second having an extrudable actuating part installed on the other side of
The new pipe is extruded by the propulsion device (not shown) into the crushed buried pipe. As shown in FIG. 5, when the propulsion device 30 is installed in the shaft 24, the propulsion device is similar to this propulsion device, but may be a simpler propulsion device.
2 and extrude a new tube 40. That is, the shaft 24
The feeder screw 34 is pulled out by the propulsion device 30 and the buried pipe 20 is crushed by the crushing head 36, and the new pipe 40 is pushed out by the propulsion device installed in the shaft 22 and guided to the crushed portion of the buried pipe 20, and the buried pipe Is replaced with a new tube. As described above, the crushing of the buried pipe 20 and the extrusion of the new pipe 40 are performed by independent propulsion devices.

When the drainage pipe 28 is connected to the buried pipe 20, the buried pipe 20 is crushed and replaced with a new pipe 40.
The drain pipe 28 is separated from the new pipe 40. The connection between the drain pipe 28 thus separated and the new pipe 40 may be performed by a technique different from the present invention.

The above-mentioned invention is suitable for a case where the buried pipe 20 is not used temporarily as in a redevelopment site throughout the area.
On the other hand, in a site where sewage is constantly flowing from homes and offices, the following should be done.

In another method of replacing the crushable underground pipe 20 with a new pipe, as shown in FIG. 1, an upstream shaft connected to the buried pipe 20 at an interval in the axial direction of the buried pipe 20 is used. 22 and a shaft 24 on the downstream side.

In general, the buried pipe 20 has two working holes 50 connected to the ground at an interval in the axial direction as shown by phantom lines in FIG. It is preferable that the working hole 24 is modified, that is, a part of the working hole 50 is used as it is, or the working hole 50 is broken to make the shaft larger than the working hole 50. When a shaft was formed in a place other than the work hole 50 and the replacement work was performed, one of the work sections was changed from the shaft to the work hole 5.
This is because it is limited to zero.

Prior to, in parallel with, or after making the shafts 22, 24, as shown in FIG. 2, a portion 52 of the buried pipe 20 upstream of the shaft 21 on the upstream side and a downstream portion are formed. The portion 53 of the buried pipe 20 downstream of the side shaft 24 is connected by a bypass pipe 54.

The illustrated bypass pipe 50 has two waterproof packers 56 to prevent sewage from entering the shafts 22, 24. As a result, the sewage is forcibly transferred to the bypass pipe 54 by the sewage pump 58 located upstream of the upstream sewage packer 56, passes through a large sewage basin 60, and the downstream sewage packer 5.
6 downstream. When the sewage basin 26 for receiving sewage from a home or a business is located between the shafts 22 and 24, the sewage basin 26 and the bypass pipe 54 are connected to the sewage pump 62 and the drainage pipe 64.
Connect with. Then, a shielding lid 66 is disposed between the sewage basin 26 and the drain pipe 28 to prevent sewage from flowing from the sewage basin 26 into the buried pipe 20 to be crushed.

After the connection by the bypass pipe 54 is completed,
One of the upstream shaft 22 and the downstream shaft 24 is provided with an extrudable, pullable, and rotatable operating portion 32.
Is installed. In the embodiment shown in FIG. 3, the propulsion unit 30 is installed in the shaft 24 on the downstream side.

The feeder screw 34 is connected to the operating part 32 of the propulsion unit 30 and inserted into the buried pipe 20 and pushed out toward the other of the upstream shaft 22 and the downstream shaft 24. In the embodiment shown in FIG.
To the shaft 22 on the upstream side. When the total length of the feeder screw 34 is longer than one stroke of the operating portion 32, the feeder screw 34 is pushed out while connecting the unit screws as described above.

As shown in FIG. 4, the feeder screw 3
4 reaches the shaft 22 on the upstream side, the extrusion of the feeder screw 34 is stopped, the crushing head 36 is connected to the feeder screw 34, and the new pipe 40 is connected to the crushing head 3
Connect to 6.

In the embodiment shown in FIG.
Is larger than the shaft 22. In this case,
The crushing head 36 is connected to the feeder screw 34, and the crushing head 36 is pulled out while rotating the crushing head 36 and the feeder screw 34.
To the buried pipe 20. New tube 4 in shaft 22
When there is room to enter 0, feeder screw 34
Is stopped, and the new tube 40 is connected to the crushing head 36. However, when there is enough room in the shaft 22, the new pipe 40 can be connected to the crushing head 36, and the crushing head 36 can be connected to the feeder screw 34 in this state.

Thereafter, as shown in FIG.
The feeder screw 34 is pulled out while rotating the feeder screw 6 and the buried pipe 20 is crushed by the crushing head 36, and the crushed crushed pieces are guided to the shaft 24 having the propulsion device 30 by the feeder screw 34 and the buried pipe 20. The new pipe 40 is guided to the crushed buried pipe. When the unit screw is removed and the unit pipes are connected for each stroke of the operation unit 32 of the propulsion unit 30, and the feeder screw 34 is continuously pulled out, the new pipe 40 is replaced with a buried pipe as shown in FIG. Can be

As shown in FIG. 7, when the crushing head 36 reaches the shaft where the propulsion device 30 is located, the new pipe 40 is buried from the shaft 22 to the shaft 24, and the shafts 22, 24 are buried.
All the buried pipes 20 in between have been replaced with new pipes 40. Therefore, the crushing head 36, the feeder screw 34 and the propulsion device 30 are removed from the shaft 24.

In the removed state, as shown in FIG. 8, the new pipe 40 is divided by the shafts 22, 24, and the bypass pipe 54 remains. Therefore, the drainage pipe 28 and the new pipe 40 are connected, the shafts 22 and 24 are broken, and the work hole 70 is broken.
The housing 72 for the shafts 22 and 24
0 and the housing 72 are connected. In addition, the bypass pipe is removed.

The propulsion device 30 used to carry out the above method includes:
This is known per se as shown in FIG. The propulsion device 30 includes a base 80 and a pair of jacks 82,
The operating portion 32 is supported by a pair of jacks 82 and the base 8
It can move above zero. Each of the pair of jacks 82 is composed of a hydraulic cylinder device, and a piston rod 84 of the hydraulic cylinder device is pivotally attached to a reaction force receiving member 86 which stands upright from a base 80. The operating portion 32 is engaged with a cylinder 88 of the hydraulic cylinder device 82 and is rotated by a hydraulic motor 90. As a result, the operating portion 32 is pushed out and pulled back by the pair of jacks 82. further,
It is rotated by a hydraulic motor 90.

The feeder screw 34 and the operating portion 32 are, for example, screwed into an internal screw provided in the operating portion 32 with an external screw provided at the end of the feeder screw 34, and screwed a detent bolt into the external screw and the internal screw. Or a square tube provided at the end of the feeder screw 34 can be fitted into a square hole provided in the operating portion 32, and a retaining bolt can be screwed into the square tube for connection.

The crushing head 36 is, as shown in FIG.
Cutter 100 provided so as to face buried pipe 20
And a pipe joint 102 for connecting the new pipe 40.

The cutter 100 has a double cylindrical portion 1 of a cutter housing 104 having a double cylindrical portion 105 and a connecting portion 106.
05 is implanted. The cutter housing 104 is
A nut 110 is screwed into an external thread provided on the shaft 108 that penetrates the connecting portion 106 and is fixed to the shaft 108. The shaft 108 is connected to the feeder screw 3
4 has an internal thread 111 at the end facing the same.
11 is an external screw 1 provided at the end of the feeder screw 34
12, and a detent bolt 113 is screwed in and connected to the feeder screw 34.

On the other hand, the pipe joint 102 is connected to an extension 109 of the shaft 108 via a journal bearing 114 so as to be rotatable, and to be immovable in the axial direction of the shaft 108 by a stopper 115 and a bolt 116. The pipe joint 102 has a cylindrical portion 103 that receives an end of the new pipe 40. An inner screw is provided in the cylindrical portion 103, and a new tube 4 is provided.
The new pipe 40 is connected to the pipe joint 102 by screwing an external thread provided at the end of the tube 0 into an internal thread of the cylindrical section 103.

While rotating the cutter housing 104 by the feeder screw 34, the crushing head 36 is
When the tube portion 103 of the pipe joint 102 enters the ground when moving toward, a frictional force acts on the tube portion 103. Although the cylindrical portion 103 cannot rotate due to this frictional force, the shaft 10
8 and the pipe joint 102 are connected via the journal bearing 114, so that the shaft 108 maintains the rotating state.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a method of removing a buried pipe and a method of replacing the buried pipe with a new pipe according to the present invention, showing one process.

FIG. 2 is a schematic view showing a method for removing a buried pipe and a method for replacing a buried pipe with a new pipe according to the present invention, which shows another process.

FIG. 3 is a schematic view showing a method for removing a buried pipe and a method for replacing a buried pipe with a new pipe according to the present invention, which shows still another process.

FIG. 4 is a schematic view showing a method for removing a buried pipe and a method for replacing a buried pipe with a new pipe according to the present invention, which shows still another process.

FIG. 5 is a schematic view showing a method for removing a buried pipe and a method for replacing a buried pipe with a new pipe according to the present invention, which shows still another process.

FIG. 6 is a schematic view showing a method of replacing a buried pipe with a new pipe according to the present invention, and shows still another process.

FIG. 7 is a schematic view showing a method for replacing a buried pipe with a new pipe according to the present invention, and shows still another process.

FIG. 8 is a schematic view showing a method of replacing a buried pipe with a new pipe according to the present invention, and shows still another process.

FIG. 9 is a schematic diagram showing a new pipe replaced by a method of replacing a buried pipe according to the present invention with a new pipe.

FIG. 10 is a perspective view showing a propulsion device that can be used when performing the method of removing a buried pipe and the method of replacing a buried pipe with a new pipe according to the present invention.

FIG. 11 is a cross-sectional view showing a crushing head that can be used when performing the method for removing a buried pipe and the method for replacing a buried pipe with a new pipe according to the present invention.

[Explanation of symbols]

 Reference Signs List 20 buried pipe 22, 24 shaft 30 thruster 32 operating part 34 feeder screw 36 crushing head 40 new pipe 50 working hole 54 bypass pipe

Claims (6)

[Claims] 1. A method for removing a buried underground pipe which is crushable, comprising: forming a first shaft and a second shaft connected to the buried pipe at an interval in an axial direction of the buried pipe. Installing a propulsion device having an extrudable, withdrawable, and rotatable operating portion in one of the first shaft and the second shaft; connecting a feeder screw to an operating portion of the propulsion device; Into the buried pipe and extrude it toward the other of the first shaft and the second shaft, wherein the feeder screw is connected to the first shaft and the second shaft.
When reaching the other shaft of the shaft, the extrusion of the feeder screw is stopped, and a crushing head is connected to the feeder screw, the feeder screw is pulled out while rotating the crushing head and the feeder screw, and the buried pipe is removed. A method for removing a buried pipe, comprising crushing by the crushing head and guiding the crushed crushed pieces to a shaft with the propulsion device by the feeder screw and the buried pipe. 2. A method for replacing a crushable underground pipe with a new pipe, comprising: a first vertical shaft and a second vertical shaft connected to the burial pipe at an interval in an axial direction of the burial pipe. Making, installing a propulsion device having an extrudable, withdrawable, and rotatable operating part in one of the first shaft and the second shaft, and attaching a feeder screw to the operating part of the propulsion device. Connected and inserted into the buried pipe, and extruded toward the other of the first shaft and the second shaft, wherein the feeder screw is connected to the first shaft and the second shaft.
When reaching the other of the shaft, the extrusion of the feeder screw is stopped, a crushing head is connected to the feeder screw, and the new tube is connected to the crushing head.The crushing head and the feeder screw are rotated. While pulling out the feeder screw and crushing the buried pipe by the crushing head, the crushed crushed pieces were guided to the shaft with the propulsion device by the feeder screw and the buried pipe, and the new pipe was crushed. A method of replacing a buried pipe with a new pipe, including guiding to the site of the buried pipe. 3. A method for replacing a crushable underground pipe with a new pipe, the method comprising: forming a first shaft and a second shaft connected to the buried pipe at intervals in an axial direction of the buried pipe. Making, installing a propulsion device having an extrudable, withdrawable, and rotatable operating part in one of the first shaft and the second shaft, and attaching a feeder screw to the operating part of the propulsion device. Connected and inserted into the buried pipe, and extruded toward the other of the first shaft and the second shaft, wherein the feeder screw is connected to the first shaft and the second shaft.
When reaching the other shaft of the shaft, the extrusion of the feeder screw is stopped, and a crushing head is connected to the feeder screw, the feeder screw is pulled out while rotating the crushing head and the feeder screw, and the buried pipe is removed. While being crushed by the crushing head, guiding the crushed crushed pieces to the shaft with the propulsion device by the feeder screw and the buried pipe, installed in the other of the first shaft and the second shaft,
A method of replacing a buried pipe with a new pipe, comprising extruding the new pipe to a site of a crushed buried pipe by a second propulsion device having an extrudable operating portion. 4. A method for replacing a crushable underground pipe with a new pipe, comprising: an upstream shaft and a downstream shaft connected to the buried pipe at intervals in an axial direction of the buried pipe. Making, prior to, in parallel with, or after making these shafts, the portion of the buried pipe upstream of the upstream shaft and the portion of the buried pipe downstream of the downstream shaft. Connecting a propulsion device having an extrudable, pullable, and rotatable operating part to one of the upstream shaft and the downstream shaft, and propelling the feeder screw. Connected to the operating part of the machine and inserted into the buried pipe, and extruded toward the other of the upstream shaft and the downstream shaft, and the feeder screw is the other of the upstream shaft and the downstream shaft. Reached Stopping the extrusion of the feeder screw, connecting a crushing head to the feeder screw, connecting the new tube to the crushing head, pulling out the feeder screw while rotating the crushing head and the feeder screw. Crushing the buried pipe by the crushing head, guiding the crushed crushed pieces to a shaft with the propulsion device by the feeder screw and the buried pipe, and guiding the new pipe to a portion of the crushed buried pipe. How to replace buried pipes with new pipes. 5. The buried pipe according to claim 4, wherein the buried pipe has two working holes leading to the ground, and the upstream shaft and the downstream shaft are modified from the working holes. How to replace a tube with a new tube. 6. After the crushing head reaches the shaft with the propulsion device, removing the crushing head, the feeder screw and the propulsion device from the shaft.
A method for replacing a buried pipe according to claim 4 or 5 with a new pipe.