JP2002004768A - Device and method of replacing existing pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method of replacing an existing pipe, by which the pipe can be replaced in a short period at a low cost by a non- opencut construction method and the splinter of an old pipe is not left in a ground. SOLUTION: New-pipe propulsive means 4, 7 propelling a new pipe used for replacing along the longitudinal direction of the old pipe 1 from one end side in the longitudinal direction of the buried old pipe 1, an old-pipe cutting means 5 being moved along the longitudinal direction of the old pipe 1 in the old pipe 1 and crossing the old pipe 1 in the longitudinal direction at a desired place and cutting the old pipe and pipe discharge means 7, 8 discharging a section cut by the cutting means 5 to one end side of the old pipe are installed to the device for replacing the existing pipe, and the old pipe 1 is covered with the new pipe 2 by using such a device and the new pipe 2 is propelled and the old pipe is replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an existing pipe updating apparatus and an updating method for removing a buried water pipe, gas pipe or other existing pipe by a non-cutting method and replacing it with a new pipe.

[0002]

2. Description of the Related Art Conventionally, when an existing pipe, such as a water pipe, is updated with a new pipe, an update operation is generally performed by an open cut method. This open-cut method involves excavating a trench from the ground surface to the buried depth of the pipe along the longitudinal direction of the buried existing pipe, removing the existing pipe from the groove, and then renewing the pipe by burying a new pipe. How to

In this open cut method, it is necessary to isolate a construction area in order to ensure safety and to prevent a third party from invading the construction area. Therefore, updating pipes by this method on roads with heavy traffic, etc., may cause traffic congestion. In urban areas, other pipes are further buried around the buried pipes as time passes, and the buried pipes are congested. In such places, the construction period is longer.

[0004] In recent years, in order to solve the above-mentioned problems caused by the open cut method, research has been conducted on a non-cutting method in which a pipe is renewed without excavating a groove in the ground. As an example, a new pipe leading device including a plasma cutting machine for making a cut in the longitudinal direction of an existing pipe with a high-voltage current, and a breaking machine for expanding the cut existing pipe radially outward to divide it. (Japanese Patent Application Laid-Open No. Hei 8 (1999)) discloses a method in which a new pipe is connected to the rear of a new pipe leading device by propelling the new pipe along the existing pipe, and a new pipe is installed while the existing pipe is broken while the new pipe is installed. -042287).

[0005] However, according to this method, fragments of the divided old pipe remain in the ground. Also, removing the remaining debris from the ground requires extremely troublesome work.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the existing pipe renewal method, and renews the pipe in a short time and at low cost by a non-cutting method. Provided is an updating device and an updating method for an existing pipe that can perform the above-described operation and that does not cause fragments of the old pipe to remain in the ground.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided an apparatus for renewing an existing pipe by cutting without digging for replacing a buried old pipe with a new pipe having a larger diameter than the old pipe. New pipe propulsion means for propelling the old pipe along the longitudinal direction of the old pipe so as to cover the new pipe from one end of the old pipe, and moving the old pipe inside the old pipe along the longitudinal direction to move the old pipe to a desired position. An old pipe cutting device that includes an old pipe cutting means that cuts at a position in the longitudinal direction and a pipe discharge means that discharges a portion cut by the old pipe cutting means to the one end side of the old pipe. Solution to the Problems

[0008] A method of updating an existing pipe, in which an old pipe buried by using an apparatus having such a configuration is replaced with a new pipe having a diameter larger than that of the old pipe, wherein the old pipe is covered. A pipe propelling step of propelling the new pipe from one longitudinal end of the old pipe along the longitudinal direction thereof, and an old pipe cutting step of cutting the old pipe in the new pipe by crossing the old pipe in the longitudinal direction, The old pipe buried is replaced with a new pipe by an existing pipe updating method including an old pipe discharging step of discharging a cut portion of the old pipe from the new pipe.

According to the present invention, the old pipe is buried along a road with heavy traffic, for example, because it is replaced with a new pipe without digging a pit above the buried old pipe along its longitudinal direction. Work can be performed without causing traffic obstacles.

In addition, since the old pipe is renewed so as to cover the old pipe, the influence of vibration or the like generated by the operation inside the new pipe does not affect the ground. Then, after the old pipe to be renewed is cut by the cutting means, the portion cut out of the new pipe by the pipe discharging means is discharged, so that the remnants of the old pipe do not remain in the ground.

Here, the new pipe which is newly renewed means any of a large-diameter sheath pipe covering a pipe such as a water pipe and a gas pipe, and a pipeline itself such as a water pipe and a gas pipe. Things. Therefore, according to the present invention, since the new pipe is renewed so as to cover the existing old pipe, not only can the size of the pipe be increased, but also the sheath pipe can be buried,
For example, a large-diameter pipeline having a plurality of pipes such as a water pipe and a gas pipe can be easily buried therein.

Further, in the present invention, in the above-described apparatus for updating a buried pipe, the new pipe propulsion means includes excavation means driven by a driving device provided on the one end side of the old pipe. Is a cutting pipe disposed between the new pipe and the old pipe, characterized by having a drill bit at the tip of its traveling direction, and in the above-described method for updating an existing pipe, Is disposed between the inner peripheral surface of the new pipe and the outer circumference of the old pipe with a drill bit at the tip thereof, and drives the drill pipe by a driving device provided at one end of the old pipe to drive the old pipe. The present invention is characterized in that the new pipe is pushed in the longitudinal direction of the old pipe and propelled while excavating the ground around the outer periphery of the pipe.

According to the present invention, the outer peripheral portion of the existing old pipe can be excavated along the longitudinal direction, and a space can be formed in a portion where a new pipe having a larger diameter than the old pipe is propelled. Therefore, the new pipe can be propelled without damage.

Further, in the present invention, in the above-mentioned existing pipe updating apparatus, the old pipe cutting means is connected to a driving device provided at the other end in the longitudinal direction of the old pipe to drive the old pipe cutting means via a rod. Wherein the drive unit moves the old pipe cutting means in the longitudinal direction of the old pipe, and rotates around a central axis extending in the longitudinal direction.

According to the present invention, the cutting means can be easily moved to a desired position in the longitudinal direction of the old pipe by moving the rod by the driving device. Then, even when the laying accuracy of the existing old pipe is poor, the old pipe cutting means can be moved by following the longitudinal direction of the old pipe by utilizing the elasticity of the rod. In addition, not only a cutter device for mechanically cutting the old pipe as the old pipe cutting means but also gas cutting means, jet cutting means, plasma cutting means, etc., depending on the type of the old pipe and the environment in which it is embedded. Cutting means can be selected.

When the cutting means is a cutter device, in the above-mentioned existing pipe updating apparatus, the rod is a double pipe rod, and the cutting means is openable and closable in the radial direction. A cutter blade attached to the distal end of the outer peripheral rod, and an inner pipe rod moving relatively in the longitudinal direction with respect to the outer peripheral rod, and pressing the cutter blade in the axial direction of the rod to And a cutter blade pressing portion that spreads outward.

According to this invention, the cutter blade pressing portion is moved in the axial direction of the rod within the narrow old tube to press the cutter blade and push the cutter blade radially outward, so that the cutter is removed from the inside of the old tube. The cutting edge of the blade is reliably applied to the old pipe and can be easily cut.

Further, in the present invention, in the above-mentioned existing pipe renewing apparatus, the pipe discharging means is a screw conveyor which spirally extends in the axial direction between the old pipe outer peripheral face and the new pipe inner peripheral face. It is characterized by the following.

According to the present invention, since the pipe discharging device is a screw conveyor extending inside the new pipe in the longitudinal direction, the cut section of the old pipe can be discharged by driving the screw conveyor while propelling the new pipe. . Further, according to the old pipe discharging means, the earth and sand excavated by the excavating means and entering the new pipe can be easily discharged.

If the screw conveyor is constructed by attaching a screw blade extending spirally along the longitudinal direction to the inner peripheral surface of the excavation pipe, the excavating means and the old pipe discharging means can be used, and When the excavation pipe is rotated to excavate the pipe, the cut portion of the old pipe can be discharged with this rotation.

In the above-described method for updating an existing pipe,
The new pipe is configured by connecting a plurality of unit pipes in the longitudinal direction thereof, and the pipe propulsion step is connected to a step of connecting the unit pipe in the longitudinal direction at one end of the old pipe. The step of pressing the unit pipes along the longitudinal direction of the old pipe is sequentially repeated, and the old pipe cutting step is performed each time a plurality of the unit pipes connected in the pipe propulsion step are propelled. The inside of the old pipe is sequentially cut in the longitudinal direction according to the position of the tip.

According to the present invention, when a method for updating an existing pipe using the above-described existing pipe updating apparatus is carried out, the unit pipe is propelled while being connected in the longitudinal direction at the construction site. The driving device of the propulsion means only needs to be a device large enough to set a unit pipe constituting the new pipe at the starting point for propelling the new pipe. Further, the cutting position of the old pipe can be made to correspond to the length of the unit pipe to be propelled, so that the work can be carried out regularly. Further, the length of the cut portion of the old pipe to be discharged can be made uniform, and subsequent disposal can be extremely easily performed.

[0023]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the progress of updating an old pipe 1 buried underground into a sheath pipe 2 as a new pipe having a large diameter using an existing pipe updating apparatus according to an embodiment of the present invention. ing.

The sheath tube 2 is composed of a plurality of unit tubes 2
A ‥ 2A is formed by bonding a plurality of unit pipes in the longitudinal direction, and the old pipe 1 embedded and buried while sequentially connecting the unit pipes.
And is propelled from one end to the other end in the longitudinal direction of the old pipe 1 to be completed (see FIG. 1A). In addition, each time the sheath tube 2 is propelled, the old tube 1 is cut so as to cross the longitudinal direction thereof, and the cut portion is cut each time the sheath tube 2 is cut.
The debris is discharged from the inside so that the debris is not left in the ground (see FIG. 1B).

In this embodiment, a starting shaft 3A (right side in the figure) is formed at a position corresponding to one end in the longitudinal direction of the old tube 1 as a starting point when the sheath tube 2 is updated, and is sequentially formed at the other end. The unit pipes 2A to 2A that have been connected and propelled form ultimately reaching shafts 3B (left side in the figure), which ultimately reach.
Then, a boring device 4 which constitutes a sheath pipe 2 propulsion means for pressing the sheath pipe 2 while excavating the ground in the starting shaft 3A is installed, and the old pipe 1 crosses the old pipe 1 in the longitudinal direction inside the old pipe 1. A cutting machine 5 is inserted as cutting means for cutting at the surface. Further, a boring device 6 for driving the cutting machine 5 is installed in the reaching shaft 3B.

Inside each unit tube 2A # 2A constituting the sheath tube 2, there is provided a tubular excavation tube 7 arranged between the inner peripheral surface of the unit tube 2A # 2A and the outer peripheral surface of the old tube 1. It excavates the ground at the outer periphery of the old pipe 1 during propulsion. This drill pipe 7
A helical screw blade 8 extending along the longitudinal direction is attached to the inner peripheral surface of the, and conveys the excavated earth and sand backward and discharges it. The excavated pipe 7 also serves as a pipe discharging means for discharging the cut portion of the old pipe 1 from the sheath pipe 2.

FIG. 2 shows a unit tube 2A # 2 constituting the sheath tube 2.
The details of the starting shaft 3A which is the starting point for propelling A are shown. The starting shaft 3A has a boring device 4 inside.
In addition, a water pump 9 for feeding water into the excavation pipe and a hydraulic unit 10 for driving the same are provided on the ground surface in the immediate vicinity of the starting shaft 3A in order to discharge earth and sand generated during excavation to the outside of the pipe. is set up. The starting shaft 3A has a width enough to allow the boring device 4 to be installed therein, and a depth enough to propel the unit tubes 2A ‥ 2A constituting the sheath tube 2 at the depth of the old tube 1 embedded therein. ing.

The boring device 4 installed inside the starting shaft 3A mainly includes a base 11 and the base 1
1 and a holding section 12 for holding the unit pipe 2A and the drilling pipe 7. A guide rail 11a extending in the front-rear direction is provided on the upper surface of the base portion 11,
The holding section 12 is supported by the guide rail 11a and moves on the upper surface of the base section 11 in the front-rear direction.

The holding portion 12 includes a first chucking portion 13 which is formed in a tubular shape and holds the outer peripheral surface by inserting a unit pipe 2A to be propelled therein, and a first chucking portion 13 of the first chucking portion 13. A second chucking portion 14 arranged rearward and holding the outer peripheral surface of the excavation pipe 7 arranged inside the unit pipe 2A, and supported on the first chucking portion 13, and the entire holding portion 12 is used as a base. A drive motor 15 for moving the section 11 in the front-rear direction and applying a rotational force to the excavation pipe 7 via the second chucking section 14, and a transmission medium section 16 for transmitting the drive force of the motor 15. .

Then, the boring apparatus 4 matches the direction in which the guide rail 11a extends with the direction in which the buried old pipe 1 extends, and adjusts the position of the central axis of both chucking portions 13, 14 to the central axis of the old pipe 1. And set in the starting shaft 3A.

The boring device 4 holds the rear part of the unit pipe 2A by the first chucking part 13, moves the holding part 12 from the rear part of the base part 11 to the front part, and moves the unit pipe 2A from the inner side surface of the starting shaft 3A. 2A is inserted into ground G and propelled.
At this time, the drill pipe 7 arranged inside the unit pipe 2A is advanced while rotating, and the ground G at the outer peripheral portion of the old pipe 1 is drilled. When the insertion of one unit pipe 2A into the ground G is completed, the holding unit 12 is moved to the rear of the base unit 11 again, and a new unit pipe 2A is set in the boring device 4. Thereafter, the front end face 2b of the set unit pipe 2A and the rear end face of the propelled unit pipe 2A are brought into contact with each other, and the mating surface is welded. The unit pipe 2 </ b> A connected while excavating G is propelled along the longitudinal direction of the old pipe 1.

In the starting shaft 3A, this operation is repeated until the tip of the connected unit pipe 2A # 2A reaches the reaching shaft (see FIG. 1). Note that, on the inner surface of the starting shaft 3A, support rollers 18, 18 for supporting the propelled unit pipes 2A # 2A are provided at the insertion portions of the unit pipes 2A # 2A. 2A is being promoted smoothly.

Next, provided inside the unit tube 2A, the second
The drilling pipe 7 held by the chucking unit 14 will be described. As shown in FIG. 2 and FIG.
Is used by connecting a plurality of unit tubes in the longitudinal direction, and a unit tube 7A provided at the head thereof is formed to be slightly longer than the unit tube 2A constituting the sheath tube 2 and connected thereafter. The unit tubes 7B # 7B to be formed are substantially the same size as the unit tubes 2A, so that all the unit tubes 7A, 7B always project from the rear end face of the unit tubes 2A # 2A of the sheath tube 2. . Also, unit pipes 7A constituting the drilling pipe 7,
Between the outer peripheral surface of the unit tube 2A and the inner peripheral surface of each unit tube 2A constituting the sheath tube 2, a plurality of rollers are provided along the circumferential direction at the positions of the front and rear ends of each unit tube 2A # 2A. Disposed bearings 20 are provided, and the drilling tube 7 is supported by these bearings 20 so as to rotate smoothly inside the sheath tube 2.

An excavation part 21 formed in a ring shape is provided along the periphery of the unit pipe 7A provided at the head of the excavation pipe 7 along the periphery thereof. The excavation portion 21 is formed by arranging a plurality of excavation bits 22 # 22 extending in the radial direction in the circumferential direction, and excavates earth and sand on the outer peripheral portion of the buried old pipe 1.

Each unit pipe 7A, 7 constituting this excavation pipe 7
A spiral screw blade 8 extending in the longitudinal direction is attached to the inner peripheral surface of B. Since the screw blades 8 are attached to the inner peripheral surfaces of the unit pipes 7A and 7B, when these rotate, they convey the material staying therein to the rear of the excavation pipe 7. For this reason, when the excavated earth and sand enters the inside of the excavation pipe 7 from the radially inner side of the excavation part 21, the screw blade 8 gradually conveys the earth and sand to the rear of the excavation pipe 7, and the unit connected to the rearmost part. The pipe 7B is discharged from the rear end to the starting shaft.

The excavating pipe 7 also has a function as a pipe discharging means for discharging the cut portion of the old pipe 1 cut by the cutting machine to the starting shaft 3A. In this case as well, like the earth and sand that has entered the inside of the excavation pipe 7, the cut portion is conveyed rearward by the screw blade 8 rotating with the rotation of the excavation pipe 7, and the unit connected to the rearmost part It is discharged into the starting shaft from the rear end of the pipe.

On the other hand, at the tip of the double pipe rod 25 supported by the boring device 6 installed in the arrival shaft 3B,
A cutting machine 5 shown in FIG. 4 is provided. Double pipe rod 2
5 is composed of an outer pipe rod 26 serving as a casing for the rod 25 and an inner pipe rod 27 extending inside the outer pipe rod 26 along its longitudinal direction. , Are provided so as to rotate inside the outer tube rod 26 and to freely move in the longitudinal direction thereof. Further, the cutting machine 5 includes an outer pipe rod 26.
And a cutter blade pressing portion 31 attached to the inner pipe rod 27 at the end of the cutter portion 30. Also, the inner pipe rod 2
7, the tip of the cutter blade pressing portion 31 further forward,
A cylindrical centralizer 32 for centering the double pipe rod 25 with respect to the old pipe 1 is provided.

The cutter portion 30 has a cylindrical cutter blade holding portion 33 that diverges toward the front of the rod 25, and is supported by the front portion of the cutter blade holding portion 33 so as to be rotatable about pivots 35 and 35. And a plurality of cutter blades 34 # 34 mounted to open and close in the 25 radial directions. A trumpet-shaped recess 33a is formed on the front surface of the cutter blade holding portion 33, and a plurality of slits extending radially from the center in the radial direction of the rod 25 communicate with the recess 33a and the side surface 33b at the front portion. Is formed. The cutter blades 34 # 34 are accommodated in these slits with their cutting edges directed toward the tip of the inner tube rod 27, and the blades are attached to the cutter blade holder 33 in the slits via pivots 35 # 35. .

The cutter blade pressing portion 31 has a front portion 31a.
The rear portion 31b is formed in a cylindrical shape having a tapered shape. In particular, the rear portion 31b has a tapered surface that forms substantially the same angle as the inclined surface of the concave portion 33a so that it can fit into the concave portion 33a of the cutter blade holding portion 33. I have.

The centralizer 32 provided at the distal end of the inner pipe rod 27 has a cylindrical body 36 having a tapered front portion and a rear portion, and a central portion in the axial direction of the body 36. And a plurality of centering rollers 37 # 37 which expand and contract in the radial direction. The roller housing 3 is provided at every 90 degrees in the circumferential direction at the axial center of the main body 36.
8 ‥ 38 is formed. This roller storage part 38 # 3
Numeral 8 is a two-step groove having an arc-shaped cross section, and a deep groove is formed at the center in the front-rear direction.

Each of the centering rollers 37 and 37 is provided with bearings 39 and 39 at shallow portions formed at the front and rear portions of the roller housings 38 and 38 via a rotating shaft extending through the center thereof in the front-rear direction. Supported. The bearings 39 # 39 have cylinders 40 # 4 that extend and contract in the radial direction of the rod 25.
0 is provided, and the cylinders 40 # 40 communicate with the inside of the inner pipe rod 27. This cylinder 40 ‥ 4
0 is supplied with hydraulic water from the inner pipe rod, and the cylinder 4
0 ‥ 40 is extended radially outward, and the centering roller 37 is
The outer peripheral surface of # 37 is in contact with the inner peripheral surface of the old pipe 1.

According to the cutting machine 5 having such a configuration, the old pipe 1 can be cut as follows. First, from the state of FIG. 4 (a), the cutter blade pressing part is pulled toward the reaching shaft side (left side of the figure) by L in the figure, and as shown in FIG.
The tapered surface b is fitted into the concave portion 33 a of the cutter blade holding portion 33. Then, the cutter blades 34 ‥ 34
The cutter blade rotates about 5 ‥ 35, and its blade edge protrudes radially outward from the side of the slit of the cutter blade holder 33. Next, the bearing 39 of the centralizer 32 is moved from the inner pipe rod 27.
Hydraulic water is supplied to cylinders 40 and 40 provided in # 39 to cause centering rollers 37 and 37 to project radially outward. Then, each centering roller 37 # 37 abuts on the inner peripheral surface of the old pipe 1, and the core of the double pipe rod 25 coincides with the core of the old pipe 1. Thereafter, the old pipe 1 is cut by driving the boring device installed in the arrival shaft (see FIG. 1) to rotate the double pipe rod 25. At this time, the centering rollers 37 and 37 extending from the main body 36 of the centralizer 32 are
Since the cutting machine 5 is in contact with the inner peripheral surface, the cutting machine 5 rotates smoothly and also reliably centers the double pipe rod 25 with respect to the old pipe 1.

In this figure, a cutter for mechanically cutting is attached to the tip of the rod as a cutting machine. However, the present invention is not limited to this. The pipe is cut by a gas-type cutting machine or a high-pressure jet. Another cutting machine such as a jet-type cutting machine or a plasma-type cutting machine can be mounted on the tip of the rod.

FIG. 5 is a flowchart showing details of the procedure for updating the old pipe 1 buried in the ground to a new pipe using the above-described updating apparatus. In the description of the present drawing, for the sake of easy understanding, each member, device, and the like will be described with reference to FIGS.

As shown in the figure, first, a shaft is excavated at both ends in the longitudinal direction of the old pipe 1 to be removed (S1). One of the shafts is the starting shaft 3A, and the other shaft is the reaching shaft 3B (see FIG. 1). And start shaft 3
A boring device to promote the sheath tube 2 to be updated to A,
A boring device for driving a double pipe rod to which the cutting machine 5 is attached is installed in the reaching shaft 3B (S
2).

Next, the double pipe rod is added in the arrival shaft 3B in the longitudinal direction and is extended toward the starting shaft 3A (S3). This operation is repeatedly performed until the distance between the cutting machine 5 and the inner side surface of the starting shaft 3A is substantially equal to the length of one unit tube constituting the sheath tube 2. On the other hand, a unit pipe constituting the sheath pipe 2 in the starting shaft 3A and an excavation pipe 7 for excavating the ground therein are set in a boring apparatus. It goes without saying that the drilling pipe 7 set first has a drilling bit provided on the front surface thereof. Then, the unit pipe and the excavation pipe 7 are pressed toward the reaching shaft 3B while rotating the excavation pipe 7 with a boring device, so that the old pipe 1 is covered from the radial outside and until the longitudinal direction of the old pipe 1 is sufficiently covered. Propelled (S4, S5). As a guide, the length of one unit tube constituting the sheath tube 2 may be propelled. Thereafter, the cutting machine 5 is connected to the old pipe 1 with the boring device of the arrival shaft 3B.
Is moved in the longitudinal direction, and is positioned slightly to the starting shaft 3A side of the tip of the unit pipe (S6), and the cutting machine 5 is operated to cut the old pipe 1 as described above (S7). The cut portion of the old pipe 1 is discharged to the starting shaft 3A from the rear end of the unit pipe together with the excavated soil by rotating the drill pipe 7 (S8). When cutting the old pipe 1, the length of the unit pipe may be cut in two or three times without cutting at once.

After that, another unit tube constituting the sheath tube 2 and the unit tube of the excavation tube 7 inside the starting shaft 3A are set in a boring device, and their front end surfaces are attached to the rear end surface of the propelled unit tube. The contact surfaces are welded (S9). The connected unit pipe is similarly propelled toward the arrival shaft 3B,
The unit tube attached to the tip propels the old tube 1 sufficiently to cover the old tube 1 in its longitudinal direction (S10, S11, S
12). Then, the cutting machine 5 is moved by the boring device of the reaching shaft 3B, and is slightly positioned from the front end surface of the unit pipe attached to the front end to the starting shaft 3A side (S13).
The old pipe 1 is cut (S14). The cut portion of the old pipe 1 rotates the drilling pipe 7 provided inside each unit pipe constituting the sheath pipe 2 in the same manner, and the starting shaft 3
A is discharged to A (S15). The above steps S9 to S15 are repeated until the unit pipe attached to the tip reaches the reaching shaft 3B (S16).

The head of the unit pipe reaches the reaching shaft 3B,
After discharging the remaining old pipe 1 from the drill pipe 7, the drill pipe 7 is sequentially taken out from the sheath pipe 2. After the tip reaches the reaching shaft 3B, it is efficient to reversely rotate the excavation pipe 7 and discharge the remaining old pipe 1 to the reaching shaft 3B.

The embodiment in which the cutting machine 5 is attached to the tip of the rod and the rod is driven by the boring device installed in the reaching shaft 3B has been described, but the present invention is not limited to this embodiment. For example, a traveling vehicle that travels along the longitudinal direction inside the old pipe 1 may be provided, and a cutting machine 5 may be mounted on the vehicle, and the vehicle may be remotely controlled by a remote controller. This method is effective when the old pipe 1 is cut by a cutting means that does not involve vibration, such as gas cutting or plasma cutting.

After the sheath pipe is buried as described above, a pipeline such as a water pipe or a gas pipe is disposed inside the sheath pipe, and formed between the inner peripheral surface of the sheath pipe and the outer peripheral surface of the pipeline. The gap is filled with grout and the update operation is completed.
If a sheath tube with a considerably larger diameter than the old tube is buried, not only a single tube but also a plurality of different types of pipes of the same type, gas pipe, water pipe, etc. Pipes can be provided. In addition, it goes without saying that the present invention can be applied not only to the case where the sheath pipe is buried, but also to the case where a pipeline such as a water pipe or a gas pipe is directly buried.

[0052]

As described above, according to the present invention, there is no need to dig along the old pipe to be renewed, and construction can be performed without obstructing traffic on the ground. In addition, all of the debris of the old pipe can be discharged without leaving it in the ground, and environmental problems can be dealt with. In addition, there is a method to cover the outer circumference of the old pipe with the new pipe to be renewed, and there is little effect on the ground. I can do it. Then, the cutting machine moving in the old pipe is moved via the elongated rod or the traveling vehicle is moved, so that the cutting machine can be moved smoothly regardless of the laying accuracy of the old pipe.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing the progress of a construction process of updating an existing old pipe to a new pipe using the existing pipe updating apparatus according to one embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a starting shaft which is a starting point for propelling a new pipe.

FIG. 3 is a perspective view in which a part of a drilling pipe inside a new pipe is cut away.

FIG. 4 is a longitudinal sectional view of a reaching shaft finally reached by a new pipe to be propelled.

FIG. 5 is a flowchart showing the flow of an update method according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Old pipe 2 New pipe (sheath pipe) 2A Unit pipe 3A Starting shaft 3B Arriving shaft 4 Boring device 4 The said boring device 5 Cutting machine 6 Boring device 7 Drilling pipe 7A, 7B Unit pipe 8 Screw blade 20 Bearing 21 Drilling part 22 Drilling Bit 25 Double pipe rod 26 Outer pipe rod 27 Inner pipe rod 30 Cutter part 31 Cutter blade pressing part 32 Centralizer 34 Cutter blade

Continuing from the front page (72) Inventor Takao Mori 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Shuichi Sugiura 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Stock Inside the company (72) Inventor Sakae Ishiyama 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Inventor Yasuhiro Matsuo 88 Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Japan Nihon Kokan Construction ( 72) Inventor Satoshi Furuya 88, Ono-cho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside Japan Steel Pipe Works Co., Ltd. 2D054 AA05 AA06 AC18 BA03 BA25 BB04 DA03

Claims (8)

[Claims] An apparatus for renewing an existing pipe by non-cutting to replace a buried old pipe with a new pipe having a diameter larger than the old pipe, wherein the new pipe is inserted from one longitudinal end of the old pipe. A new pipe propulsion means for propelling along the longitudinal direction of the old pipe so as to cover it, and moving along the longitudinal direction inside the old pipe to cross the old pipe at a desired position in the longitudinal direction. An updating apparatus for an existing pipe, comprising: an old pipe cutting means for cutting; and a pipe discharging means for discharging a portion cut by the old pipe cutting means to the one end of the old pipe. 2. The new pipe propulsion means includes excavation means driven by a driving device provided on the one end side of the old pipe, and the excavation means is configured to connect the old pipe with the old pipe. The renewal device for an existing pipe according to claim 1, wherein the cutting pipe is disposed between the pipes, and the cutting pipe has a drill bit at a tip end thereof in the traveling direction. 3. The old pipe cutting means is attached via a rod to a driving device provided on the other end side of the old pipe in the longitudinal direction for driving the old pipe cutting means. 2. The existing pipe updating device according to claim 1, wherein the pipe cutting means is moved in the longitudinal direction of the old pipe and is rotated around a central axis extending in the longitudinal direction. 4. The rod is a double-pipe rod, and the cutting means includes a cutter blade attached to a distal end of an outer peripheral rod of the double-pipe rod so as to be openable and closable in a radial direction; And a cutter blade pressing portion attached to the inner tube rod which moves relatively in the longitudinal direction thereof, and presses the cutter blade in the axial direction of the rod to spread the cutter blade radially outward. Item 3. The existing pipe updating device according to Item 3. 5. The line according to claim 1, wherein the pipe discharging means is a screw conveyor that extends spirally in the axial direction between the outer circumference of the old pipe and the inner circumference of the new pipe. Existing pipe updating device. 6. A method for renewing an existing pipe in which a buried old pipe is replaced with a new pipe having a diameter larger than the old pipe, wherein the new pipe is covered with the old pipe so as to cover the old pipe. A pipe propulsion step of propelling along the longitudinal direction from one side of the direction, an old pipe cutting step of cutting the old pipe in the new pipe by crossing the old pipe in the longitudinal direction, and cutting the cut portion of the old pipe into the old pipe. A method for renewing an existing pipe by non-cutting, comprising an old pipe discharging step of discharging from a new pipe. 7. The pipe propulsion step includes disposing a drill pipe having a drill bit at a tip thereof between the inner peripheral surface of the new pipe and the outer circumference of the old pipe, and using a driving device provided at one end of the old pipe. 7. The method for updating an existing pipe according to claim 6, wherein the drilling pipe is driven to extrude a ground around the outer circumference of the old pipe while pressing and pushing the new pipe in a longitudinal direction of the old pipe. . 8. The new pipe is constituted by connecting a plurality of unit pipes in the longitudinal direction thereof, and the pipe propulsion step is a step of connecting the unit pipes in the longitudinal direction at one end of the old pipe. And a step of pressing the connected unit pipes along the longitudinal direction of the old pipe. The old pipe cutting step comprises a plurality of unit pipes connected in the pipe propulsion step. The method for updating an existing pipe according to claim 6, wherein the old pipe is sequentially cut in the longitudinal direction in accordance with the position of the tip of the pipe at each time.