JPH0932472A - Device and method for renewing existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for disposal of sludge to renew an existing pipeline by causing adjacent rotors to be displaced in different directions, rotating a crankshaft using a drive mechanism, and placing a plurality of bits on the outer peripheral surface of a rotor. SOLUTION: Adjacent rotors 18, 20 are made eccentric with respect to an axis 12 in opposite directions, and the direction of reaction of the rotor 18 is reversed relative to that of reaction of the rotor 20 to reduce the reaction working on a shield main body 14. As a result, the hydraulic power required for advancing the shield main body 14 is reduced. Also, when the reactions produced in the rotors 18, 20 are of the same direction, they cancel each other out, and the reaction working on the shield main body 14 as bending moment is decreased. Therefore the direction of advance of a renewing device 10 is stabilized, the number of times that the direction is corrected is reduced, the work of correcting the direction is facilitated, and direction control can be stabilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for renewing existing pipelines such as water supply pipes and sewer pipes without using an excavation method.

[0002]

2. Description of the Related Art As one of devices for updating an existing pipeline such as a sewer pipe without using an excavation method, the existing pipeline is moved while moving the excavator from one end to the other. There is a device for excavating a pipe and arranging a new pipe at the excavation mark by the excavator (Japanese Patent Laid-Open No. Sho 62-220693).

However, in this apparatus, the excavated material must be discharged to the ground through a new pipe and a start shaft, and the excavated material must be discharged. Therefore, the construction cost is high.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to renew an existing pipeline without the need to discharge the excavated material.

[0005]

An existing conduit renewal device according to the present invention includes a tubular shield body, a crank shaft rotatably supported by the body around an axis of the body, and a front portion of the body. A plurality of rotors sequentially arranged in the area in the direction of the axis and rotatably supported by the crankshaft, defining substantially conical or frustoconical outer surfaces in cooperation with each other, and The rotor includes a plurality of rotors displaced in different directions, a drive mechanism for rotating the crankshaft about the axis, and a plurality of bits provided on an outer peripheral surface of each rotor.

The updating device is moved forward by the original pushing device or the like while the crankshaft is rotated. Each rotor reciprocates at least in the radial direction with the rotation of the crankshaft, and the bit damages the existing pipe line at the edge portion of the tip as the rotor reciprocates in the radial direction. As a result, the existing pipeline is excavated or destroyed by either the large or small rotor and the bit attached to the rotor.

The excavated product or the destroyed product caused by the excavation or the destruction is pressed against the surrounding ground by at least a large-diameter rotor and is left in the surrounding ground. The excavation or debris that has moved around the small-diameter rotor due to excavation or destruction by the large-diameter rotor and the bit attached to it is pushed around the small-diameter rotor by the small-diameter rotor, As it moves forward, it is pressed against the surrounding ground by a large-diameter rotor.

According to the present invention, a plurality of rotors defining the outer surfaces of the conical or frusto-conical shape in cooperation with each other and displaced in different directions, and a plurality of rotors provided on the outer peripheral surface of each rotor. Since the existing pipes are excavated or destroyed by using the bit and the excavation or destruction caused by the excavation or destruction is pressed against the surrounding ground by the rotor, the excavation to the ground without using the excavation method The existing pipeline can be renewed without performing discharge processing.

It is preferable that each bit has an edge portion which is located at the tip of the wedge-shaped one end portion and extends in the axial direction of the shield main body in parallel with the outer peripheral surface of the rotor. As a result, the existing pipeline is damaged by the edge, but the long edge extends parallel to the outer peripheral surface of the rotor in the direction of the axis of the shield body, so the edge has a longer life than the conical bit. Become.

The plurality of bits are provided in each of a plurality of virtual concentric circles on the outer peripheral surface of the rotor, and each bit is arranged at a position corresponding to between two adjacent bits on an adjacent concentric circle. Preferably. Thereby, the existing pipeline can be surely damaged.

It is preferable that the rotation axes of adjacent rotors are eccentric in parallel in opposite directions with respect to the axis of the shield body. As a result, the displacement of the rotor in the radial direction becomes the same in each part of the shield body in the axial direction,
The existing pipeline will be reliably excavated or destroyed.

[0012] In a preferred embodiment, the crankshaft has a plurality of displacing portions which are formed in the forward direction of the main body in the direction of the axis and which respectively support the rotor, and adjacent displacing portions. Are eccentric in opposite directions with respect to said axis.

In the existing pipeline renewal method of the present invention, the crankshaft is rotated by the drive mechanism while advancing the renewal device as described above together with the propulsion pipe following the rear part of the renewal device, and the rotor and the bit. By excavating or destroying the existing pipeline, and pressing the excavated material or the destroyed material formed by the excavation or destruction against the surrounding ground by the rotor.

The existing pipeline whose inner diameter is smaller than the maximum diameter of the small-diameter rotor is excavated or destroyed by at least the small-diameter rotor and the bit attached to the rotor, and the excavated product formed by the excavation or the destruction is formed by the small-diameter rotor. The small diameter rotor is pressed against the ground, and the excavated material or the destroyed material is further pressed against the surrounding ground by the large diameter rotor as the renewal device advances.

An existing pipeline having an inner diameter smaller than the maximum diameter of a rotor having a large diameter is excavated or destroyed by at least a rotor having a large diameter and a bit attached to the rotor. The excavated material or destroyed material moved around is pushed around the small diameter rotor by the small diameter rotor, and the excavated material or destroyed material is pressed against the surrounding ground by the large diameter rotor as the updating device advances.

An existing pipeline of a size that can be excavated or destroyed by a small-diameter rotor and a large-diameter rotor is excavated or destroyed by a small-diameter roller and a large-diameter rotor and a bit attached to those rotors. The excavated material or the destroyed material formed by excavation or destruction is pressed against the surrounding ground by the small-diameter rotor and the large-diameter rotor.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to FIGS. 1-3, a renewal device 10 includes a cylindrical shield body 14 having an axis 12.
And a crankshaft 16 rotatably supported by the body 14 about the axis 12 and the axis 12 in a region in front of the body 14.
A plurality of rotors 18 and 20 rotatably supported on the crankshaft 16 and the crankshaft 16
And a drive mechanism 22 for rotating the shaft 12 about the axis 12.

The shield body 14 includes a first tubular portion 24.
A second tubular portion 26 connected to the rear end portion of the first tubular portion 24, and the inside of the shield body 14 provided at the front end of the first tubular portion 24 from the front region. A partitioning wall portion 28 and a boss portion 30 coaxially arranged in the second tubular portion 26 are provided in the second tubular portion 26. The first and second tubular portions 24 and 26 are connected by a plurality of bolts 32. The boss portion 30 is connected to the wall portion 28 and also connected to the first tubular portion 24 by the plurality of ribs 34.

Although not shown, the shield body 14
Is connected to a tubular body in which a hydraulic device, piping equipment, etc. are arranged by a plurality of direction correction jacks such as a hydraulic type at the rear end portion of the second tubular portion 26. The orientation of the shield body 14 with respect to the tubular body is modified by extending or retracting at least one direction modifying jack by a predetermined amount, as is known. Thereby, the forward direction of the update device 10 is corrected. The tubular body has substantially the same outer diameter dimension as the shield body 14.

The crankshaft 16 has a main body portion 36 and a plurality of displacement portions 38, 40 successively connected to one end of the main body portion 36. The displacement portions 38, 40 project forward from the wall portion 28. As shown in FIG.
Supported by

The rotors 18 and 20 are supported on the displacement portions 38 and 40 by a plurality of bearings 44 and 46, respectively. The rotors 18 and 20 are formed in a shape that defines the outer surfaces of a substantially frusto-conical shape in cooperation with each other, and are arranged on the crankshaft 16 such that the rotor 20 having a smaller diameter is located on the front side. The rotors 18, 20 may have a shape that defines a generally conical outer surface.

In the illustrated example, two rotors 18 and 20 are provided, and thus two displacement portions 38 and 40 are formed on the crankshaft 16. Thus, in the illustrated example, the rotors 18 and 20 are displaced in opposite or opposite directions with respect to the axis 12, respectively, and thus the displacements 38 and 40 are also displaced in opposite directions with respect to the axis 12, respectively. The displacement amounts of the rotors 18 and 20 are preferably the same value, but may be different values.

However, more than two rotors may be used.
In this case, adjacent rotors are preferably eccentric in opposite directions with respect to the axis. Further, the eccentric amounts of three or more rotors are preferably the same value, but may be different values.

In the illustrated example, the rotors 18 and 20 are eccentric parallel to the axis 12 in opposite directions by e ₁ and e ₂ , respectively, and the displacement portions 38 and 40 are also opposite in axis direction 12 with respect to e _1. And e ₂ are eccentric in parallel. Therefore, the displacement parts 38 and 4
0 is an eccentric part parallel to each other. It is preferable that e ₁ and e ₂ have the same value, but they may have different values.

The drive mechanism 22 includes a rotation source such as a hydraulic motor, and is attached to the boss portion 30 by a plurality of bolts (not shown). The drive mechanism 22 is connected to the main body portion 36 of the crankshaft 16 by a key at its output shaft 48.

The space in which the bearings 42, 44 and 46 are arranged is filled with lubricating oil. Mechanical seals 50 and 52 are arranged between the wall portion 28 and the rotor 18 and between the adjacent rotors 18 and 20, respectively, in order to protect the lubricating oil from sediment. The rear end of the space between the boss portion 30 and the main body portion 36 is closed by a seal member 54. Further, the front end of the space between the crankshaft 16 and the most advanced rotor 20 is closed by a cap 56.

The mechanical seal 50 is disposed on the front surface of the wall portion 28, and is a seat plate 58 extending around the crankshaft 16.
A ring 60 disposed in an annular recess formed on the rear surface of the rotor 18 and extending around the crankshaft 16; and a plurality of compression coil springs 62 for pressing the ring against the front surface of the wall portion 28. The spring 62 connects the rotor 18 with the axis 12
Are arranged in recesses formed at equal angular intervals around the. However, the ring 60 and the spring 62 may be arranged on the wall portion 28, and the seat plate 58 may be arranged on the rear surface of the rotor 18.

The mechanical seal 52 is disposed on the front surface of the rotor 18 and extends around the crankshaft 16 to form the seat plate 6.
4 and a ring 66 arranged in an annular recess formed in the rear surface of the rotor 20 and extending around the crankshaft 16,
A plurality of compression coil springs 68 that press the ring against the rear surface of the rotor 20. The springs 68 are arranged in recesses formed in the rotor 20 around the axis 12 at equal angular intervals. However, ring 66 and spring 68
The seat plate 64 may be disposed on the rear surface of the rotor 20.

A plurality of bits 70 are provided on the outer surfaces of the rotors 18 and 20, respectively. A plurality of bits 70 are provided on each of a plurality of virtual concentric circles on the outer peripheral surface of each rotor, and each bit 70 is arranged at a position corresponding to between two adjacent bits 70 on an adjacent concentric circle. There is. A plurality of cutter parts 72 may be attached to the cap 56.

In each bit 70, as shown in FIG. 4, one end of a rod-shaped main body is formed in a truncated cone shape with an angle θ1 and two opposite ends of the one end are tapered with an angle θ2. By doing so, it is formed in a wedge shape. For this reason,
Each bit 70 has a wedge-shaped one end 70a and an elongated edge 70b at the tip of the one end and extending in one direction. Each bit 70 is attached to the rotor such that the edge 70b extends in the direction of the axis 12 parallel to the outer peripheral surface of each rotor. The edge 70b may have an arc shape having a large radius of curvature. Each bit 70 as a whole, preferably one end 70a, more preferably an edge 70b
Part of which is made of ultra-hard metal such as tungsten carbide.

Since the illustrated embodiment is an updating device used in the pipe propulsion method, the updating device 10 continues the thrust from the original pushing device or the like arranged in the starting shaft to the rear part of the updating device 10. By receiving through the above propulsion pipe,
It is advanced with the propulsion pipe. However, the forward movement of the updating device 10 may be performed by arranging a plurality of jacks between the propulsion pipe arranged at the leading edge and the rear part of the updating device. The outer diameter of the propulsion pipe is almost the same as the outer diameter of the shield body 14.

While the updating device 10 receives thrust, the crankshaft 16 is rotated by the rotating mechanism 22. As a result, the rotors 18 and 20 are
6 rotates about the axis 12 (revolutionary motion) along with the rotation of 6, and at this time, the outer peripheral surface is rotated while abutting against the ground to rotate around the axes of the displacement parts 38 and 40 of the crankshaft 16. Make a rotational movement.

The rotors 18 and 20 reciprocate at least in the radial direction with the rotation of the crankshaft 16, and the bit 70 damages the existing pipeline at the edge portion 70b as the rotor reciprocates in the radial direction. As a result, the existing pipeline is excavated or destroyed by the large or small rotor 18 or 20 and the bit 70b attached to the rotor.

The excavated material or the destroyed material caused by the excavation or the destruction is pressed against the surrounding ground by at least the large-diameter rotor 18, and is left on the surrounding ground. Excavations or debris that have moved around the small diameter rotor 20 due to excavation or breakage by the large diameter rotor 18 and the bit 70b attached thereto are pushed around the small diameter rotor 20 by the small diameter rotor 20. As the renewal device advances, it is pressed against the surrounding ground by the large-diameter rotor 18. As a result, the surrounding ground is consolidated.

An existing pipeline having an inner diameter smaller than the maximum diameter of the rotor 20 having a small diameter is excavated or broken by at least the rotor 20 having a small diameter and the bit 70 attached to the rotor, and the excavated or crushed material formed by the excavation or the destruction. Is pressed against the surrounding ground by the small-diameter rotor 20, and the excavated material or the debris is further pressed against the surrounding ground by the large-diameter rotor 18 as the renewal device advances.

The existing pipeline having an inner diameter smaller than the maximum diameter of the large-diameter rotor 18 is moved around the small-diameter rotor 20 by being excavated or destroyed by at least the large-diameter rotor 18 and the bit 70 attached to the rotor. , The excavation or debris is pushed around the small-diameter rotor by the small-diameter rotor 20, and the excavation or debris is pushed by the large-diameter rotor 18 to the surrounding ground as the updating device 10 advances. To be

Further, the existing pipeline having a size to be excavated or destroyed by both rotors 18 and 20 is excavated or destroyed by both large and small rotors 18 and 20 and bit 70 attached to both rotors, and excavated or destroyed. The excavated material or the destroyed material formed by the above is pressed against the surrounding ground by the rotors 18 and 20 as the updating device 10 advances.

When excavating or destroying the existing pipeline with both rotors 18 and 20, and when pushing the excavated or destroyed product against the surrounding ground with both rotors 18 and 20, the reaction force in the radial direction of the shield body 14 is increased. Rotors 18, 20
Occurs in When this reaction force is transmitted to the shield body 14 as it is, the shield body 14 is strongly pressed against the ground, so that a large frictional force is generated between the shield body 14 and the ground, and as a result, a large forward movement of the shield body 14 occurs. Requires thrust.

However, in the renewal device 10, since the adjacent rotors 18 and 20 are eccentric in the opposite directions with respect to the axis 12, the direction of the reaction force of the rotor 18 and the direction of the reaction force of the rotor 20 are opposite. . As a result, the reaction force of the rotor 18 and the reaction force of the rotor 20 cancel each other out, so that the reaction force acting on the shield body 14 becomes small, and the friction force between the shield body 14 and the ground caused by the reaction force. The force is reduced and as a result the thrust required to advance the shield body 14 is reduced.

If the direction of the reaction force generated in the rotor is the same, this reaction force acts as a bending moment on the shield body. When such a bending moment acts on the shield body, the forward direction of the updating device becomes unstable. In particular, in the case of an updating device that corrects the forward direction of the device with a direction correcting jack, the forward direction of the updating device becomes unstable due to the bending moment acting on the shield body, and direction correction must be frequently performed. The direction correction work becomes complicated and the direction control becomes unstable.

However, in the renewal device 10, the reaction force of the rotor 18 and the reaction force of the rotor 20 cancel each other out, so that the reaction force acting as a bending moment on the shield body 14 becomes small, and the reciprocal direction of the renewal device 10 is reduced. Stabilizes. In addition, despite being a device that can correct the direction,
The forward direction of the update device 10 is stabilized, the number of times of direction correction is reduced, the direction correction work is facilitated, and the direction control is stabilized.

According to the updating device 10, since the excavated material or the destroyed material is pressed against the surrounding ground, it is not necessary to discharge the excavated material or the destroyed material to the ground through the updating device. In addition, the edge portion 70b is parallel to the outer peripheral surface of the rotor and the axis 12
Since the bit 70 is arranged on the rotor so as to extend in the direction of, the edge has a longer life than the conical bit. Further, a plurality of bits are provided in each of a plurality of virtual concentric circles on the outer peripheral surface of the rotor, and each bit is arranged at a position corresponding to between two adjacent bits on an adjacent concentric circle. , The existing pipeline is surely scratched.

The plurality of bits are provided in each of a plurality of virtual concentric circles on the outer peripheral surface of the rotor, and each bit is arranged at a position corresponding to between two adjacent bits on an adjacent concentric circle. Preferably. Thereby, the existing pipeline can be surely damaged.

When the rotation axes of the adjacent rotors are eccentric to each other in the opposite direction with respect to the axis 12 as in the updating device 10, the radial displacement of the rotor is the same in each portion in the direction of the axis 12. Therefore, the existing pipeline will be surely excavated or destroyed. However, the rotation axis of the adjacent rotor and the axis of the adjacent displacement portion are set to be inclined axes intersecting with the axis 12 at an appropriate position on the axis 12, preferably in front of the rotor located at the frontmost portion with respect to the axis 12. Good.

The existing pipeline that can be renewed according to the present invention is preferably a pipeline constructed by a Japanese industrial standard type B tube, a fume tube or the like, particularly a ceramic tube. However, the present invention can also be applied to the renewal of an existing pipeline constructed by another pipeline. The present invention is not limited to the above embodiment. For example, the bit 70 may not be arranged on the rotor so that the edge portion 70b extends in the direction of the axis 12 parallel to the outer peripheral surface of the rotor, a conical bit may be used, and a plurality of bits may be added to the rotor. You may arrange | position irregularly on the outer peripheral surface.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an updating device of the present invention.

2A is an enlarged cross-sectional view of a part of the updating device shown in FIG. 1, and FIG. 2B is a diagram showing a direction of an edge portion of a bit.

3A is an enlarged end view of the updating device shown in FIG. 1 as viewed from the left side, and FIG. 3B is a diagram showing a direction of an edge portion of a bit.

4A and 4B are diagrams showing an embodiment of a bit, in which FIG. 4A is a plan view, FIG. 4B is a front view, and FIG. 4C is a right side view.

[Explanation of symbols]

 10 Updating device 12 Axis of shield body 14 Shield body 16 Crankshaft 18,20 Rotor 22 Drive mechanism 36 Main part of crankshaft 38,40 Displacement part (eccentric part) of crankshaft 50,52 Mechanical seal 70 bit 70a One end of bit Part 70b Bit edge part

Claims (9)

[Claims] 1. A cylindrical shield body, and a crankshaft rotatably supported by the body about an axis of the body.
A plurality of rotors sequentially arranged in the region of the front of the main body in the direction of the axis and rotatably supported by the crankshaft, the rotors defining substantially conical or frustoconical outer surfaces in cooperation with each other. An existing pipe including a plurality of rotors in which adjacent rotors are displaced in mutually different directions, a drive mechanism for rotating the crankshaft about the axis, and a plurality of bits provided on an outer peripheral surface of each rotor. Road update device. 2. The updating device according to claim 1, wherein each bit has an edge at a tip of one end of a wedge shape and extending in a direction of the axis parallel to an outer peripheral surface of the rotor. 3. A plurality of the bits are provided on each of a plurality of virtual concentric circles on the outer peripheral surface of the rotor,
The updating device according to claim 1 or 2, wherein each bit is arranged at a position corresponding to between two adjacent bits on an adjacent concentric circle. 4. The rotation axes of adjacent rotors are eccentric in parallel in opposite directions with respect to the axis of the shield body,
The update device according to claim 1, 2, or 3. 5. The crankshaft has a plurality of displacement portions that are sequentially formed in the front direction of the main body in the direction of the axis and support the rotor, and adjacent displacement portions with respect to the axis. Is displaced in the opposite direction,
The updating device according to claim 1, 2, 3, or 4. 6. The updating device according to claim 1, wherein the crankshaft is rotated by the drive mechanism while advancing the updating device together with a propulsion pipe that follows a rear portion of the updating device, and the rotor and the rotor. A method for updating an existing pipeline, comprising excavating or destroying an existing pipeline with a bit, and pressing the excavated material or the destroyed material formed by the excavation or destruction against the surrounding ground by the rotor. 7. While excavating or destroying the existing pipeline by at least a rotor having a small diameter and a bit attached to the rotor, the excavated material formed by the excavation or destruction is surrounded by the rotor having a small diameter around the rotor having the small diameter. The updating method according to claim 6, wherein the excavated material or the destroyed material is pressed against the ground and further pressed against the surrounding ground by a large-diameter rotor as the updating device advances. 8. The excavation or destruction of the existing pipeline by at least a large-diameter rotor and a bit attached to the rotor, and the excavation or destruction of a small-diameter excavated or destroyed material moved around the small-diameter rotor due to the excavation or destruction. The updating method according to claim 6, wherein the rotor is pushed around the small-diameter rotor, and the excavated material or the debris is pushed against the surrounding ground by the large-diameter rotor as the updating device advances. 9. A small-diameter rotor and a large-diameter rotor, and a bit attached to the rotor excavates or destroys the existing pipeline, and excavates or destroys the excavated or destroyed excavated object or the disrupted object. The updating method according to claim 6, wherein the updating is pressed against the surrounding ground by.