JPH04366080A - Existing pipe exchanging method without open excavating and its device - Google Patents

Abstract

PURPOSE:To improve work efficiency in exchanging an obsolete existing pipe such as a cast-iron pipe for a new pipe without open excavating by inserting a joint cutting device in the existing pipe and cutting the joint over a predetermined length in the axial direction removing it and then, inserting a new pipe with a propelling device. CONSTITUTION:In exchanging work, a joint cutting device 10 which is movable in an existing pipe 1 is inserted into the pipe, the joint 2 of the existing pipe 1 is cut at a plurality of points by a vertical cutter 16 and a horizontal cutter 15 over a predetermined length in the axial direction, and front and rear of the joint 2 in the cut length in the axial direction is cut by a circumferential cutter 13. Next, a cut piece of the joint is recovered in the cut piece container by a cut piece recovering device 20, and then, the ground on the outer circumferential side of a general part of the cut existing pipe 1A from which the joint 2 was removed is excavated by an excavating pipe 33. After that, a new pipe 5 is connected to the rear of the excavating pipe 33 and both the pipes 5 and 33 and propelled for a predetermined distance by a propelling device 8, and then, the general part of the cut existing pipe 1A is made to pass the new pipe 5 with held by a holding clamp to be removed.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method and apparatus for replacing existing pipes such as aged cast iron pipes with new pipes without excavation. The present invention relates to a method and apparatus for re-laying the ground.

0002

[Prior Art] Conventionally, the pipe-in-pipe method, in which a small-diameter new pipe of one size is inserted into the existing pipe, has been known as a non-trench method for replacing existing pipes. Since the flow rate of the pipe is lower than that of the existing pipe, there has recently been a request to replace the existing pipe with a new pipe of a size equal to or larger than the existing pipe in order to secure the flow rate, and various construction methods and devices have been proposed. Examples of these construction methods and devices include, for example, JP-A-6
As disclosed in Publication No. 2-112830, over the entire length of the replacement section, there is a truncated conical enlarged diameter portion with a taper that widens toward the rear when being towed inside the existing pipe cut in the pipe axis direction; A diameter expansion exchange device consisting of a new pipe connection part continuous to the rear of the diameter part, a large number of roller-shaped diameter expansion protrusions provided on the surface of the diameter part, and a maximum diameter larger than the outer diameter of the new pipe. Therefore, a construction method has been proposed in which a new pipe is inserted into the existing pipe while expanding the diameter by pushing the existing pipe open.

[0003] Furthermore, as disclosed in Japanese Patent Application Laid-open No. 194396/1983, an excavator that has at least an excavating means and an earth removal means inside the cylindrical body and has a larger diameter than the existing pipe is used to remove the existing pipe. The excavator is placed along the outer periphery of the existing pipe and excavated, and a new pipe with a larger diameter than the existing pipe is connected to the rear of the excavator to extend the existing pipe. A method of removing the pipes has also been proposed.

0004

[Problem to be solved by the invention] The above-mentioned Japanese Patent Application Laid-Open No. 62-11
In the case of Publication No. 2830, when removing an existing pipe, the existing pipe is crushed and a new pipe is inserted with the crushed pieces left on the outer periphery, so the outer coating of the new pipe is damaged by the crushed pieces. There is a risk of damage. In addition, existing pipes are cut along their entire length in advance in the axial direction to make it easier to crush them, but the long cutting length requires a long time to cut, and the cutting cutter is frequently worn out and replaced. There are issues with low efficiency.

Furthermore, in the case of JP-A No. 62-194396, an excavator having an excavating means inside a cylindrical body is mounted on the outer periphery of an existing pipe, and the ground around the outer periphery of the existing pipe is excavated. The existing pipe is removed while laying a new pipe connected to the rear, but the inner diameter of the new pipe needs to be larger than the outer diameter of the socket joint or mechanical joint of the existing pipe, and the cylindrical body is Since the inner excavator needs to be able to pass through the joint, the excavation diameter will be quite large. For this reason, it is necessary to make the new pipe larger than necessary, which not only increases the material cost, but also risks damaging other buried pipes, etc. if there are other underground pipes in close proximity to the existing pipe. . Furthermore, when removing existing pipes, there is also the problem that socket joints and mechanical joints are tightly fitted, making it difficult to remove them.

[0006]

[Means for Solving the Problems] In order to advantageously solve the above-mentioned problems, in the non-trench method for replacing existing pipes of the present invention, a joint cutting device is provided which is movable by being inserted into the existing pipe 1. The vertical cutter 16 and the horizontal cutter 15 at 10 cut the joint part 2 of the existing pipe 1 at multiple locations over a predetermined length in the axial direction, and cut both the front and rear sides of the joint part 2 within the axial cutting length in a circle. The outer periphery of the cut existing pipe 1A in the general section after cutting in the circumferential direction with the circumferential cutter 13, and then collecting the joint section cut pieces 2A into the cut piece container 24 with the cut piece collecting device 20, and then removing the joint section 2. The side ground was excavated with the excavation pipe 33, a new pipe 5 whose inner diameter was larger than the outer diameter of the existing pipe 1 was connected to the rear of the excavation pipe 33, and the excavation pipe 33 and the new pipe 5 were propelled a predetermined distance by the propulsion device 8. After that, the re-laying device 3 removes the cut existing pipe 1A in the general section by passing it through the new pipe 5 while holding it with the holding clamp 34.
0, the existing pipes 1 are sequentially replaced. In addition, in the trenchless existing pipe replacement device of the present invention, the existing pipe 1
The front main body 12 and the rear main body 17 that are moved inside are connected via the moving telescopic cylinder 14, and the front main body 12 is rotated by a rotation axis parallel to the pipe center line of the existing pipe 1. A circumferential cutter 13 is provided on the rear main body 17, and includes a rotary cutter 13G that is supported so as to be movable forward and backward toward the wall of the existing pipe 1 and rotated in the circumferential direction of the wall of the existing pipe 1. A vertical cutter 16 includes a rotary cutter 16D that is rotated by a rotating horizontal axis perpendicular to the axial direction of the existing pipe 1 and is supported so as to be movable in the vertical direction; A horizontal cutter 1 equipped with a rotary cutter 15D that is rotated by a rotating vertical shaft and supported so as to be movable in the left and right directions.
5, and a cut piece collection device 20 consisting of an arm actuator and a cut piece container 24 are provided at the rear end of the rear main body 17, and after the excavation pipe 33 that excavates the ground on the outer peripheral side of the cut existing pipe 1A. The new pipe 5 is connected to the end thereof, and a moving member 52 that is moved within the cut existing pipe 1A and the new pipe 5 is provided with a holding clamp 34 for holding the cut existing pipe 1A.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic diagram illustrating an overall case where the present invention is implemented to replace existing pipes without excavation. When implementing the present invention and replacing existing pipes, the pipes are inserted into the existing pipes 1 from the starting shaft 3 or the reaching shaft 4, and the joint portion 2 is inserted into the existing pipe 1.
A joint cutting device 10 that inserts a cutting line to cut the joint, a cut fragment collecting device 20 that collects the joint cut fragment 2A, and an existing pipe in which the joint 2 was cut and removed while a new pipe 5 was added to the rear part of the starting shaft 3. Existing pipe replacement without excavation using a replacement device 30 that excavates the ground around the outer periphery of the general part of the pipe and moves the cut existing pipe 1A through the new pipe 5 to the starting shaft 3 and removes it. and perform each of the above operations on the ground control panel 6,
This is done by performing the steps in step 7.

The structure of the joint cutting device 10 will be explained with reference to FIGS. 4 to 13. The cylindrical front body 12 has built-in hydraulic equipment such as a hydraulic pump and a valve unit.
is placed on the front side of the existing pipe 1 (on the reaching shaft 4 side), and a cylindrical rear body 17 is placed on the rear side of the existing pipe 1 (on the starting shaft 3 side), and is connected to the front body 12. Rear body 1
7 through a movable telescopic cylinder 14, and a plurality of movable wheels 11 are provided at the lower part of the front main body 12 and the rear main body 17, respectively, at intervals in the front-rear direction (longitudinal direction of the existing pipe) and the left-right direction. attached, said front body 1
A circumferential cutter 13 is installed at the front end of 2 (the end on the reaching shaft 4 side).
A horizontal cutter 15 is provided at the front of the rear main body 17, and a vertical cutter 16 is provided at the middle of the rear main body 17.

Fixing clamps 12A are attached to both sides of the front body 12 in the diametrical direction, and fixing clamps 17A are attached to both sides of the rear body 17 in the diametrical direction. When cutting and when moving the rear main body 17 and the part supported by it by the movable telescopic cylinder 14, the fixing clamp 12A is pressed against the inner wall surface of the existing pipe 1.
The front body 12 is fixed to the existing pipe 1. Also, when cutting the existing pipe 1 using the vertical cutter 16 and the horizontal cutter 15, and when cutting the front main body 1 using the movable telescopic cylinder 14,
2 and the portion supported thereby, the fixing clamp 17A is pressed against the inner wall surface of the existing pipe 1, and the rear main body 17 is fixed to the existing pipe 1. Note that as a means for moving the joint cutting device 10, a self-propelling method using drive wheels or a traction method using a wire rope or the like may be adopted.

To explain the configuration of the circumferential cutter 13 in the joint cutting device 10, as shown in FIGS. The end portion is fixed, the center gear 13C is fixed to the front end portion of the support shaft 45, and the rear portion of the rotating frame 13D having a circular cross section is inserted into a recess 46 having a circular cross section provided in the front portion of the front main body 12. A frame rotation drive device 13A, which is disposed in a rotary frame 13D and is rotatably supported via a bearing and is composed of an electric motor with a reduction gear, is fixed to a rotation frame 13D and fixed to a rotation shaft of the frame rotation drive device 13A. The rotating gear 13B is meshed with the center gear 13C. A telescoping cylinder 13E, which is a hydraulic cylinder or an electric telescoping mechanism, is located at the front of the rotating frame 13D and is arranged to extend in the radial direction, and one end of the telescoping cylinder 13E is fixed to the rotating frame 13D. A cutter drive device 13F consisting of an electric motor with a speed reducer or a hydraulic motor is fixed to the other end of the telescopic cylinder 13E, and the rotation axis of the cutter drive device 13F is arranged to extend in the front-rear direction. A disc-shaped rotary cutter 13G is fixed to the front end of the rotary frame 13D, and is disposed a little forward from the front end of the rotary frame 13D.

When the frame rotation drive device 13A is operated, the rotation gear 13 meshing with the center gear 13C
B rotates around the central gear 13C, so the rotating frame 13D rotates around the central extension line of the front main body 12. Further, when the telescopic cylinder 13E is extended, the rotary cutter 13G is moved toward the peripheral wall of the existing pipe 1, and when the telescopic cylinder 13E is shortened, the rotary cutter 13G is moved toward the center of the existing pipe 1. The rotary cutter 13G is pressed against the existing pipe 1 by the telescopic cylinder 13E to cut through the existing pipe 1, and the rotating frame 13D is rotated around the center line of the existing pipe 1, thereby cutting the entire circumference of the existing pipe 1. Can be cut across. If the rotary cutter 13G is not used, shorten the telescopic cylinder 13E and use the rotary cutter 13.
Move G to the center side of the existing pipe 1.

To explain the structure of the upper and lower cutters 16 in the joint cutting device 10, as shown in FIGS. The intermediate portion is arranged and pivotally connected by a pin 16J, and cutter drive devices 16C consisting of an electric motor with a reduction gear or a hydraulic motor are fixed on both left and right sides of one end of the arm 16B, and a rotation axis of each cutter drive device 16C is fixed. are arranged on a straight line extending in a direction perpendicular to the pipe axis direction of the existing pipe 1, and a disc-shaped rotary cutter 16D is fixed to each rotary shaft, and each rotary cutter 1
6D have the same diameter and are arranged in parallel at intervals in a direction perpendicular to the pipe axis direction of the existing pipe 1. An arcuate rack 16E centered on the pin 16J is provided at the other end of the arm 16B, and a cutter lifting/lowering drive device 16G consisting of an electric motor with a speed reducer is fixed to a support base 16F fixed to the support member 16A. and a drive gear 16K fixed to the rotating shaft of the cutter elevating drive device 16G.
is engaged with the arcuate rack 16E, and cutter protruding notches 16H are provided at the upper and lower parts of the rotary cutter 16D in the rear main body 17, and when the cutter elevating drive device 16G is operated in forward or reverse rotation. , the arm 16B is rotated in the forward or reverse direction, and the rotary cutter 16D protrudes from the upper or lower notch 16H.

When cutting the upper side of the joint portion 2 of the existing pipe 1, the cutter lifting drive device 16G is rotated in the forward direction.
Press the rotary cutter 16D against the upper inner wall of the joint part 2,
While each rotary cutter 16D is rotated in the direction of the arrow in FIG. 9 by the cutter drive device 16C, the front main body 12 is fixed and the rear main body 17 and the upper and lower cutters 16 supported by it are moved by the movable telescopic cylinder 14.
By moving in the axial direction of the existing pipe 1, as shown in FIG. 13, two cutting lines 40 extending in the pipe axial direction can be inserted above the joint portion 2.

Similarly, when cutting the lower side of the joint 2 of the existing pipe 1, the cutter elevating drive device 16G is operated in reverse rotation, the rotary cutter 16D is pressed against the lower inner wall of the joint 2, and the cutter By moving the rear main body 17 in the axial direction of the existing pipe 1 while rotating each rotary cutter 16D by the drive device 16C, as shown in FIG. A cutting line 40 of the book can be inserted. When the rotary cutter 16D is not in use, the arm 16B is rotated by the cutter elevating drive device 16G to position the rotary cutter 16D near the center of the existing pipe. In addition, in this example,
Although the configuration is such that two cutting lines are provided at the upper and lower portions of the joint portion 2 using one upper and lower cutter 16, an independent upper cutter and lower cutter may be provided. Further, the number of rotary cutters 16D in the upper and lower cutters 16 may be increased or decreased depending on the diameter of the existing pipe.

The horizontal cutter 15 in the joint cutting device 10 has a mechanism roughly similar to that of the upper and lower cutters 16, and the horizontal cutter 15 is attached to the front part of the rear main body 17. To explain the configuration of the horizontal cutter 15, a support member 15A is fixed to the front part of the rear main body 17, and a base end portion of a swing arm 15B is pivotally attached to the support member 15A by a vertical axis. An arcuate rack 15E centered on the vertical axis is provided at the end, and a swing drive device 15G consisting of an electric motor with a speed reducer or a hydraulic motor is fixed to the support member 15A. A drive gear 15K fixed to a rotating shaft is meshed with the arcuate rack 15E, and a cutter drive device 15C consisting of an electric motor with a speed reducer or a hydraulic motor is fixed to the tip of the swing arm 15B.
A horizontal disc-shaped rotary cutter 15D is fixed to the vertical rotation axis of the cutter drive device 15C, and cutter protrusion notches 15H are provided at positions on both left and right sides of the rear main body 17 facing the rotary cutter 15D, When the swing drive device 15G is rotated forward or backward, the swing arm 15B is rotated forward or backward,
The rotary cutter 15D protrudes from the cutter protrusion notch 15H on the left or right side, and the rotary cutter 15D can cut a cutting line 41 extending in the pipe axis direction on both left and right sides of the existing pipe 1, as shown in FIG. can.

14 and 15 show the state in which the joint part 2 of the existing pipe 1 is cut by the circumferential cutter 13, the upper and lower cutters 16, and the horizontal cutter 15, and the joint part 2 is divided into six parts in the circumferential direction. , six joint section cut pieces 2A are provided.

The cut piece collecting device 20 is provided at the rear end of the rear main body 17 to collect the joint cut pieces 2A that have been cut into pieces by the joint cutting device 10. The configuration of the cut piece collection device 20 will be explained as shown in FIG.
As shown in FIG. 2, a first telescoping arm 21 that extends and contracts in the pipe axis direction on the center line of the existing pipe 1 is provided at the rear end of the rear main body 17.
A driving device 50 consisting of an electric motor with a speed reducer or a hydraulic motor for rotating the first telescopic arm 21 is fixed to the rear part of the rear main body 17, and a driving device 50 is fixed to the rear part of the rear body 17.
The proximal end of a second telescoping arm 22 extending in the radial direction of the existing pipe is fixed to the distal end of the telescoping arm 21, and the distal end of the second telescoping arm 22 has a function of holding the joint section cut piece 2A. An attachment 23 is attached, a cut piece container 24 and a television camera 25 for monitoring cut piece collection work are attached to the rear of the rear main body 17, and the drive device 50
A cut piece collecting device 20 is constituted by a first telescopic arm 21 that is rotated by the first telescopic arm 21 , a second telescopic arm 22 that supports an attachment 23 , and a cut fragment container 24 attached to the rear main body 17 . The first telescoping arm 21 and the second telescoping arm 22 are extended and contracted by a known hydraulic or electric method, and the first telescoping arm 21, the second telescoping arm 22, and the drive device 50 are remotely controlled by the control panel 6 on the ground. be done. Further, as the attachment 23 for holding the joint section cut piece 2A, for example, an electromagnet is used when the existing pipe 1 is made of a magnetic material, and for example, a vacuum suction tool is used when the existing pipe 1 is made of a non-magnetic material such as a Hume pipe.

Next, the re-laying device 30 is shown in FIGS. 16 to 19.
This is explained by The re-laying device 30 has a function of replacing the general portion of the existing pipe 1 with a new pipe 5 while removing the general portion of the existing pipe 1 whose joint portion 2 has been cut and recovered by the joint portion cutting device 10 described above. The re-laying device 30 is equipped with an excavation cutter 31 at its tip for digging into the ground around the outer periphery of the cut existing pipe 1A, and the proximal end is rotatably attached to the holding casing 32 via a bearing 53 so that it will not come off in the axial direction. a guide tube 36 that is inserted into the cut existing pipe 1A, holds the cut existing pipe 1A with the holding clamp 34, and is movable with the spherical wheels 35; Consisting of a rotary clamp 37 that is connected to provide a rotational force to the excavation pipe 33, and a rotation drive device 39 that is provided with a fixed clamp 38 that uses the holding casing 32 as a reaction force support and provides a rotational driving force to the rotary clamp 37. The front end of a new pipe 5 whose inner diameter is larger than the outer diameter of the existing pipe is connected to the rear end of the holding casing 32, and a propulsion jack 8 is connected to the new pipe 5 in the starting shaft 3.
The new pipe 5 is laid by applying thrust.

A guide head 51 is provided at the front end of the guide tube 36, and includes a holding clamp 34 for cutting the guide tube 36, a rotation clamp 37, and a rotation drive device 39.
The fixing clamp 38 to the holding casing 32 is operated and released by remote control from the operation panel 7 on the ground. Further, the guide tube 36, the rotary clamp 37, and the rotary drive device 39 are connected in series to constitute a moving member 52, and traveling spherical wheels 35 are rotatably attached to the moving member 52 at appropriate intervals. It is being When moving the moving member 52, a self-propelled drive device is connected,
Alternatively, traction wires may be attached to the front and rear ends of the moving member 52 so that the movement can be carried out inside the existing pipe 1 and into the new pipe 5 by traction from the starting shaft 3 and the arrival shaft 4.
You may move within.

Next, a method for replacing existing pipes using the apparatus of the present invention will be explained. 20 to 43 show the process of cutting and removing the existing pipe joint. When cutting and removing a joint, first insert the joint cutting device 10 into the existing pipe 1 from the open end of the starting shaft 3 or arrival shaft 4, and monitor with a television camera or joint position detector (not shown). The upper and lower cutters 16 are moved to the cutting position of the joint portion 2. Next, the clamp 12 of the front body 12
A is activated to fix the front main body 12 in the existing pipe 1, rotate the rotary cutter 16D of the upper and lower cutters 16, and operate the cutter lifting drive device 16G.
By pressing the rotary cutter 16D against the upper or lower inner wall of the existing pipe 1 to cut through it, and then moving the rear main body 17 supporting the upper and lower cutters 16 in the pipe axis direction using the movable telescoping cylinder 14. , two cutting lines (slits) 40 extending in the tube axis direction over the front and rear length L including the joint portion 2 are inserted. Next, the rotary cutter 16D is moved downward or upward by the drive device 16G for raising and lowering the cutter in the upper and lower cutters 16, and then the above-mentioned operation is repeated to also move the remaining portions of the joint part 2 in the vertical direction. Insert the cutting line 40 of the book (see FIGS. 20 to 22).

After the cutting by the upper and lower cutters 16 is completed, the rear main body 17 is moved to position the horizontal cutter 15 at the joint 2, and then, in the same manner, the horizontal cutter 15 is placed on both left and right sides of the joint 2 in the existing pipe 1. A cutting line 41 extending in the tube axis direction is made by a rotary cutter 15D of No. 15 over approximately the same length as the cutting line 40 (FIG. 23).
(See FIG. 25).

After cutting lines 40 and 41 are made on the upper and lower sides and both sides of the joint 2 of the existing pipe 1, the clamp 12A of the front main body 12 is released, and the rotary cutter 13G of the circumferential cutter 13 is inserted into the joint 2. cutting lines 40 on the top, bottom, left and right of
. 2 and by operating the frame rotation drive device 13A, the rotating frame 13D is rotated in the circumferential direction, and a cutting slit 42 is cut in the circumferential direction of the joint portion 2 (FIGS. 26 to 29). reference).

Next, move the circumferential cutter 13 by a distance L to the opposite side across the joint 2, and similarly cut the joint 2 of the existing pipe in the circumferential direction with the rotary cutter 13G (
(See FIGS. 30 to 33).

By the above cutting, the joint portion 2 is divided into six cut pieces. Note that the order in which the upper and lower cutters 16 and the horizontal cutter 15 cut the joint portion 2 in the axial direction may be performed first, and the cutting in the circumferential direction may be performed before the cutting in the axial direction.

Next, a cut piece collecting device 30 is placed at the cutting joint position.
While moving and monitoring with the television camera 25,
The first telescoping arm 21 and the second telescoping arm 22 are monitored, and each joint cut piece 2A is sucked by the attachment 23 and collected into the cut piece container 24 (Fig. 3
4 to 36). Following the same procedure, each joint of the existing pipe is cut and recovered, and the cut pieces of the joint are removed from the existing pipe. After completing the cutting and removal of one joint part 2 of the existing pipe 1, or after completing the cutting and removal of each joint part 2, the cut existing pipe 1A is removed and replaced with a new pipe 5. This re-laying is performed according to the procedure shown in FIGS. 37 to 43. That is, first, the guide pipe 36 of the re-laying device 30 is inserted into the cut existing pipe 1A from the existing pipe end of the starting shaft 3, the digging pipe 33 is inserted so as to cover the outer periphery of the cut existing pipe 1A, and the rotating clamp 37 is inserted. While operating and holding the excavation pipe 33, the rotary drive device 39 is fixed to the holding casing 32 with the fixing clamp 38, and by operating the rotary drive device 39, the excavation pipe 33 is rotated. In this state, by applying thrust with a jack (not shown) from the rear end of the holding casing 32, the cut existing pipe 1A is applied to the guide head 5.
1 and a guide pipe 36 having spherical wheels 35, the pipe 33 excavates the ground around the outer periphery of the cut existing pipe 1A.
(See Figures 37 and 38).

As the excavation pipe 33 moves forward, a new pipe 5 having a larger outer diameter than the existing pipe is connected to the holding casing 32 at the rear end of the re-laying device 30 at predetermined strokes by welding or the like (Fig. 39).
and Figure 40).

When the excavation pipe 33 reaches a position covering the cut existing pipe 1A, the excavation by the excavation pipe 33 is stopped, the holding clamp 34 of the guide pipe 36 is activated, and the cut existing pipe 1A is
is held by the guide tube 36, and the rotation clamp 37 and the fixed clamp 38 of the rotation drive device 39 are released (see FIGS. 41 and 42). Next, as shown in FIG. 43, the re-laying device 30 is moved into the starting shaft 3 shown in FIG. 1 through the new pipe 5.

When the cut existing pipe 1A reaches the starting shaft 3, the holding clamp 34 of the guide pipe 36 is released and the cut existing pipe 1A is removed from the re-laying device 30. Next, the re-laying device 30 is passed through the new pipe 5 and moved to a predetermined position within the cut existing pipe 1A, and the excavation pipe 33 is excavated and the new pipe 5 is connected in the same manner as in the above case. and cut existing pipe 1A
By repeating this process, the existing pipe 1 is replaced with a new pipe 5.

In this embodiment, the excavation pipe 33 is of a rotating type, but if the distance between re-laying is short or the ground is soft, the excavation pipe 33 is made of a non-rotating type and excavation is carried out using only the thrust of the propulsion jack. You may. In this case, the rotary clamp 37, the rotary drive device 39 and the holding casing 3
2 can be omitted and the straight new pipe 5 can be connected to the rear end of the tunneling pipe 33, so the apparatus can be simplified.

[0030]

According to the present invention, the joint part 2 of the existing pipe 1 is cut in the axial direction by the upper and lower cutters 16 and the horizontal cutter 15, and both the front and rear sides of the joint part 2 within the axial cutting length are cut in a circle. After cutting the existing pipe 1 in the circumferential direction with a circumferential cutter 13 and dividing and removing the joint part 2, the existing pipe 1 is made into a cylindrical cut existing pipe 1A having no outward protrusion. The ground on the outer circumferential side of 1A is excavated using the excavation pipe 33 to which the new pipe 5, which is larger in outer diameter than the existing pipe 1, is connected, and the cut existing pipe 1A is passed through the new pipe 5 while being held by the holding clamp 34 and removed. , it is possible to replace the existing pipe 1 with a new pipe 5 having a larger diameter, and since all the existing pipe 1 is removed and no fragments of the existing pipe are left in the soil, when the new pipe 5 is laid, No. 5 external coating will not be damaged. Furthermore, the size of the new pipe 5 to be replaced can be slightly larger than the outer diameter of the existing pipe 1, so the new pipe will not be expensive, and even if there is an existing pipe buried nearby, There is no risk of damaging the In addition, the only part of the existing pipe 1 to be cut and removed is the joint part 2, and the general part of the existing pipe 1 can be removed with its cylindrical shape intact, which has the effect of improving work efficiency when replacing the pipe. can get.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional side view showing the entire structure when replacing an existing pipe without excavation by implementing the present invention.

FIG. 2 is an enlarged longitudinal sectional side view showing the vicinity of the re-laying device in FIG. 1;

FIG. 3 is an enlarged longitudinal sectional side view showing the vicinity of the joint cutting device in FIG. 1;

FIG. 4 is a longitudinal sectional side view showing the joint cutting device.

FIG. 5 is a longitudinal sectional side view showing the rear part of the joint cutting device.

FIG. 6 is a longitudinal sectional side view showing the front side of the joint cutting device.

FIG. 7 is an enlarged vertical cross-sectional side view showing a circumferential cutter in the joint cutting device.

FIG. 8 is an enlarged front view showing a circumferential cutter in the joint cutting device.

FIG. 9 is a longitudinal sectional side view showing an enlarged view of the upper and lower cutters in the joint cutting device.

FIG. 10 is a partially longitudinal front view showing an enlarged view of the upper and lower cutters.

FIG. 11 is a partially longitudinal front view showing a state in which the lower side of the joint part is cut by the upper and lower cutters.

FIG. 12 is a partially longitudinal side view showing an enlarged view of the horizontal cutter.

FIG. 13 is a vertical sectional front view showing a state in which the side portion of the joint portion is cut by a horizontal cutter.

FIG. 14 is a longitudinal sectional front view showing a state in which the upper and lower and left and right sides of the joint are cut.

15 is a cross-sectional view taken along the line AA in FIG. 14. FIG.

FIG. 16 is a partially longitudinal side view showing the re-laying device.

FIG. 17 is a partially longitudinal side view showing an enlarged rear portion of the re-laying device.

FIG. 18 is a partially longitudinal side view showing an enlarged front portion of the re-laying device.

FIG. 19 is a vertical sectional side view showing a rotatable connection portion between the tunneling pipe and the holding casing.

FIG. 20 is a partially longitudinal side view showing a state in which the upper and lower parts of the joint are cut by the upper and lower cutters.

21 is a partially longitudinal side view showing an enlarged part of FIG. 20; FIG.

FIG. 22 is an enlarged cross-sectional view taken along line BB in FIG. 21;

FIG. 23 is a partially longitudinal side view showing a state in which both left and right sides of the joint are cut by a horizontal cutter.

24 is a partially longitudinal side view showing an enlarged part of FIG. 23; FIG.

FIG. 25 is a sectional view taken along line CC in FIG. 24;

FIG. 26 is a partially longitudinal side view showing a state in which the front part of the joint part is cut with a circumferential cutter.

27 is a partially longitudinal side view showing an enlarged part of FIG. 26; FIG.

FIG. 28 is a longitudinal sectional front view showing a state in which the front part of the joint part is cut by a circumferential cutter.

FIG. 29 is a side view showing how the front part of the joint part is cut by the circumferential cutter.

FIG. 30 is a partially longitudinal side view showing a state in which the rear part of the joint part is cut with a circumferential cutter.

31 is a partially longitudinal side view showing an enlarged part of FIG. 30; FIG.

FIG. 32 is a longitudinal sectional front view showing a state in which the rear part of the joint part is cut by a circumferential cutter.

FIG. 33 is a side view showing how the rear part of the joint part is cut by the circumferential cutter.

FIG. 34 is a partially longitudinal side view showing a state in which a cut piece of a joint portion is stored in a cut piece container.

35 is a partially longitudinal side view showing an enlarged part of FIG. 34; FIG.

FIG. 36 is a longitudinal sectional front view showing a state in which a joint section cut piece is stored in a cut piece container.

FIG. 37 is a partially longitudinal side view showing a state in which the rotary clamp of the re-laying device is brought into pressure contact with the excavation pipe and the fixed clamp is brought into pressure contact with the holding casing.

38 is a partially longitudinal side view showing an enlarged part of FIG. 37; FIG.

FIG. 39 is a partially longitudinal side view showing a state in which the ground around the outer periphery of the cut existing pipe is being excavated by the excavation pipe of the re-laying device.

40 is a partially longitudinal side view showing an enlarged part of FIG. 39; FIG.

FIG. 41 is a partially longitudinal side view showing a state where the cut existing pipe is held by the holding clamp of the re-laying device.

42 is a partially longitudinal side view showing an enlarged part of FIG. 41; FIG.

FIG. 43 is a partially longitudinal side view showing a state in which the cut existing pipe is being carried out.

[Explanation of symbols] 1 Existing pipes 1A Cut existing pipe 2 Joint part 2A Joint cut piece 3 Starting shaft 4 Arrival shaft 5 New pipe 8. Propulsion device 10 Joint cutting device 11. Moving wheels 12 Front body 12A Clamp 13 Circumferential cutter 13A Frame rotation drive device 13B Swivel gear 13C Center gear 13D Rotating frame 13E Telescopic cylinder 13F Cutter drive device 13G rotary cutter 14 Telescopic cylinder for movement 15 Horizontal cutter 15A Support member 15B Swivel arm 15C Cutter drive device 15D rotary cutter 15E Arc-shaped rack 15G Swing drive device 15K driving gear 16 Upper and lower cutter 16A Support member 16B Arm 16C Cutter drive device 16D rotary cutter 16E Arc-shaped rack 16G cutter lifting device 16K driving gear 17 Rear body 17A Clamp 20 Cut piece recovery device 21 First telescopic arm 22 Second telescopic arm 23 Attachment 24 Cut piece container 30 Laying replacement equipment 31　Drilling cutter 32 Holding casing 33　Excavation pipe 34 Holding clamp 35 Spherical wheel 36 Guide tube 37 Rotating clamp 38 Fixed clamp 39 Rotary drive device 50 Drive device

Claims (2)

[Claims] 1. A vertical cutter 16 and a horizontal cutter 15 in a joint cutting device 10 which is movable by inserting into an existing pipe 1 are used to cut a plurality of joints 2 of an existing pipe 1 over a predetermined length in the axial direction. At the same time, the circumferential cutter 13 cuts both the front and back sides of the joint part 2 within the axial cutting length in the circumferential direction, and then the cut parts 2A of the joint part are stored in the cut part container 24 by the cut piece collecting device 20. After removing the joint part 2, the ground on the outer circumferential side of the cut existing pipe 1A in the general section is excavated using the excavation pipe 33, and the inner diameter of the existing pipe 1 is removed.
A new pipe 5 larger than the outer diameter of is connected to the rear of the excavation pipe 33,
After the excavation pipe 33 and the new pipe 5 are propelled a predetermined distance by the propulsion device 8, the cut existing pipe 1A in the general section is held by the clamp 34.
A non-cutting method for replacing existing pipes, characterized in that the existing pipes 1 are sequentially replaced by a replacement device 30 that removes the existing pipes 1 by passing them through the new pipes 5 while holding them. [Claim 2] Front main body 12 moved within the existing pipe 1
and a rear main body 17 are connected via a movable telescoping cylinder 14, and are rotated by a rotation axis parallel to the pipe center line of the existing pipe 1 to the front main body 12, and are rotated toward the pipe wall of the existing pipe 1. A circumferential cutter 13 is provided with a rotary cutter 13G supported so as to be movable forward and backward and rotated around the wall of the existing pipe 1. The upper and lower cutters 16 include a rotary cutter 16D that is rotated by a horizontal rotating shaft and supported so as to be movable in the vertical direction; , and a horizontal cutter 15 including a rotary cutter 15D supported movably in the left and right direction, and the rear main body 1
A cut piece collecting device 20 consisting of an arm actuator and a cut piece container 24 are provided at the rear end of 7, and a new pipe 5 is connected to the rear end of an excavation pipe 33 that excavates the ground on the outer peripheral side of the cut existing pipe 1A. , a non-cutting existing pipe replacement device characterized in that a moving member 52 that is moved within the cut existing pipe 1A and the new pipe 5 is provided with a holding clamp 34 for holding the cut existing pipe 1A.