JPH0366992A - Existing pipe breaking device - Google Patents

Abstract

PURPOSE:To regulate the length of a broken piece to such a length as to prevent the easy enlargement of load as well as prevent the unheaval phenomenon of the ground surface by providing the lower side part in the moving direction of a movable main body with groove forming means for forming crack inducing grooves on the inner peripheral surface of an existing pipe. CONSTITUTION:A movable main body 1 movable along the pipe axis of an existing pipe A is provided with a pressure-breaking means 5d for applying pressure to the inner peripheral surface B of the existing pipe A to break the existing pipe A, thus forming an existing pipe breaking device. The lower side part in the moving direct direction than the pressure applied part by the pressure-breaking means 5d in the movable main body 1 is provided with groove forming wheel bodies 5a, 5b, 5c as groove forming means for forming a groove E for inducing cracks to the existing pipe A at the inner peripheral surface B of the existing pipe A. As a result, the circumferential length of a broken piece can be regulated to such a length as to prevent the easy enlargement of load displaced outward in the pipe diameter direction as well as avoid the upheaval phenomenon of the ground surface.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a movable body that can move along the pipe axis of existing pipes such as water pipes, sewer pipes, gas pipes, power cables, and protection pipes for communication cables. The present invention relates to an existing pipe crushing device that is provided with pressure crushing means that pressurizes a plurality of circumferential locations on the inner circumferential surface of an existing pipe outward in the pipe radial direction to crush the existing pipe into a plurality of pieces in the circumferential direction.

[Conventional technology]

Officially registered existing pipe crushing equipment is capable of crushing existing pipes outward in the pipe radial direction in a state of excavation and excavation. If you want to replace the existing pipe with a new pipe, you can do so by inserting a new pipe into the space created by the fractured remains of the existing pipe, and compared to replacing the pipe with a new pipe by excavating from the ground, it requires less ground facilities due to excavation work. It has the advantage of avoiding negative impacts on roads and traffic, as well as reducing excavation costs and labor.However, conventional pipe crushing equipment has the following advantages: Each of these is provided with a crushing member that acts on the existing pipe by biting into its wall thickness, and the existing pipe is shattered by impact while these crushing members are forcibly moved along the pipe axis direction.

(El) A crushing member that presses and crushes the existing pipe from the inner peripheral surface of the pipe toward the outer peripheral surface is provided at each of multiple positions that are out of phase along the pipe circumferential direction, and these crushing members are used to A device that crushes existing pipes with an impact while forcibly moving them outward.

There are (a) and (b) above (for example, Special Publication Publication No. 60-278
(See Japanese Patent Application Laid-Open No. 161293/1983).

[Problem to be solved by the invention]

Both of the devices (() and (o) above are equipped with crushing members at a plurality of positions that are out of phase along the circumferential direction of the pipe, and these crushing members are applied with an impact to crush the existing pipe portion. Since the pieces are crushed at will, the size of the crushed pieces in the circumferential direction tends to vary, and as shown in Fig. 5, crushed pieces (09a) with a long length in the circumferential direction are generated. Then, this crushed piece (09a) is pushed away by the member (03).
The load when pushing away the crushed pieces (09b) with a short length in the circumferential direction increases compared to when pushing away the crushed pieces (09b) with a long length in the circumferential direction.
As a) is pushed outward in the radial direction of the pipe, the ground surface (10) tends to bulge (10a).

The present invention has been made in view of the above circumstances, and by devising a crushing means, the circumferential length of the crushed pieces is reduced, and the load is increased when pushing the crushed pieces outward in the radial direction of the pipe. The purpose of the present invention is to provide a crushing device for existing pipes that can be controlled to a length that is difficult to break and that does not easily cause upheaving of the ground surface.

[Means to solve the problem]

The characteristic configuration of the present invention for achieving the above object is that, in the official existing pipe crushing device, a predetermined position of the existing pipe is placed at a position on the downstream side in the moving direction from a pressurizing position by the pressure crushing means of the movable main body. The pipe is provided with a groove forming means for forming a groove on the inner circumferential surface of the existing pipe to induce cracks,
This configuration provides the following effects.

[For production]

The pressure applied by the pressure crushing means tends to concentrate on the groove forming part,
The existing pipe will be crushed along the groove-forming portion.

〔Effect of the invention〕

Since the existing pipe can be crushed along the groove forming part, the circumferential length of the crushed pieces can be restricted to a length that prevents the load from increasing when the crushed pieces are pushed outward in the pipe radial direction, and it also prevents the rise of the ground surface. This phenomenon is less likely to occur.

In the existing pipe crushing device according to claim 2, since the groove forming means is constituted by rotatable groove forming wheels arranged at predetermined intervals in the circumferential direction, for example, a blade portion fixed to the movable main body can be used. Compared to a groove forming means that forms a groove while sliding the movable body along the inner circumferential surface of the existing pipe, the load on the moving body can be reduced.

In the existing pipe crushing device according to claim 3, the groove forming means is configured by arranging a group of rings each consisting of a plurality of freely rotatable groove forming bodies at predetermined intervals in the circumferential direction; The plurality of groove-forming transponders constituting each of the body groups are arranged such that the depth of the groove formed by the groove-forming transponder disposed on the lower side in the direction of movement is equal to the depth of the groove formed on the upper side in the direction of movement. Since the forming wheel is arranged to make the groove deeper, it is possible to gradually form deeper grooves, and as in the case of suddenly forming deep grooves, there is no chance of cracks starting from that point in irregular directions during groove formation. There is less risk of this occurring, and the deeper the groove is formed closer to the position where the pressure is applied by the pressure crushing means, the more the groove can be formed, and the existing pipe can be reliably crushed from the end side along the groove.

In the existing pipe crushing device according to claim 4, the groove-forming wheel is constituted by a rotating body for cutting, and a driving means for driving and rotating the rotary body is provided. It is easier to form a groove of a desired depth than when the groove is brought into pressure contact with the inner circumferential surface of an existing pipe and transferred as the movable body moves.

In other words, even for ductile pipes, where simply pressing the ring against the inner peripheral surface of the existing pipe may deform the welded portion outward in the pipe radial direction, making it impossible to form a groove of the desired depth.
A groove of a desired depth can be actively formed by forcefully rotating the cutting rotor.

〔Example〕

Fig. 3 shows an existing pipe crushing device according to the present invention, in which four rib pairs (2a) each consisting of two ribs formed between two ribs on the tip side are shaped like a cross in cross section along the long plane direction. A movable main body (1) is constructed by sequentially connecting a leading member (2) having a combined shape, a pushing member (3) having a truncated conical shape, and a cylindrical member (4) back and forth. , each of the rib pairs (2a) has an inner diameter (D+) of about 150 ws and a wall thickness (T) of 1 as the movable body (1) moves along the tube axis.
Inner peripheral surface (B) of existing pipe (A) made of gray cast iron of approximately 2n+
), the first to third wheels (5a) made of hard metal have a model outer peripheral surface (5f) as a groove forming means that is rolled while being pressed into the wall thickness of the ring body (5a), (
5b).

A transport group (5) consisting of three (5c) arranged in parallel is provided, and behind it is a model outer peripheral surface (5e) as a pressurized crushing means.
) is provided with a crushing transport body (5d) made of hard metal.

Then, as shown in Figure 4, bits (p+) and (pz) are drilled at the front and rear ends of the existing pipe (A) to be replaced, and the leading member (2) is installed from the starting pitch (P+) side. tube(
A) Wind the wire (6) connected to the leading member (2) into the inner circumferential surface (B) side with the winch (W) installed on the reaching bit (pg) side, and remove the leading member (2). By forcibly towing it along the existing pipe (A),
The ring group (5) of the leading member (2) connects the inner peripheral surface of the existing pipe (A) (
B) Groove along the tube axis direction to induce cracks (E)
is formed at four locations in the circumferential direction of the pipe, and further, this groove (E) portion is pressurized outward in the pipe radial direction with the crushing wheel (5d), and the end of the existing pipe (A) is pressed in the circumferential direction. While crushing into a plurality of pieces, the crushed pieces (9) are pushed away outward in the pipe radial direction with the member (3), and the crushed pieces (9) are pressed against the ground side with the cylindrical member (4>), A tunnel-like space (S
) are successively shaped, and a new tube (C) with a truncated conical guidance head (C1) connected to the rear end of the cylindrical member (4) and a starting bit (PI) are attached to the rear of the new tube with the guidance head (C). The new pipes (C), which are sequentially connected from the side, are inserted into this space (S), and the existing pipes (A) can be replaced with new pipes (C) without excavation.

The new pipe (C) has a double pipe structure in which the inner pipe (C+) is covered with a steel pipe (C2).
Mortar (G3) is filled between the inner tubes (C9) to maintain a constant outer diameter over the entire length even though the connecting flange portion between the inner tubes (C9) has a large diameter so that it can be inserted smoothly. has been done.

The first to third wheels (5a), (5b), (5c) and the crushing transport body (5d) constituting each of the transport body group (5) are as shown in FIG. , the wheels (5b), (5c), (5d) located on the upper side in the moving direction
) is located on the lower side in the moving direction (5a), (5
b) The first wheel bodies (5a) provided in each of the wheel group (5), which are freely rotatably supported on the support shaft (7), are rotated along the transfer traces of (5c). , second wheel body (5b
), the combinations of the third wheels (5c), and the crushing wheels (5d) are as shown in FIG.
They are arranged so that their pressure contact positions with respect to the existing pipe (A) are located within a substantially common plane orthogonal to the moving direction of the leading member (2).

The penetration amount (d,) of the first ring body (5a) into the existing pipe (Δ) wall thickness (T) is about IN, and the second wheel body (5b)
The penetration amount (d2) of the third wheel (5c) is set to about 3n, the penetration amount (d3) of the third wheel (5c) is set to about 5n, the penetration t (d,) of the crushing wheel (5d) is set to about 711, and the leading member (
2) is towed along the inner circumferential surface (B) of the existing pipe (A), the first wheel body (5a) moves to a depth of approximately 1n (II).
E), then the second wheel (5b) forms the first wheel (5a
) is transferred along the groove (E) formed by the second wheel (5b), expanding its depth to about 3a, and then the third wheel (5c) is moved along the groove (E) formed by the second wheel (5b). The crushing wheel (5d) is then rolled along the groove (E) formed by the third wheel (5c) and its depth is further expanded to about 5fi. The existing pipe (A) is crushed (F) to a substantially constant circumferential length along the groove (E).

The existing pipe (A) may be crushed along the circumferential direction due to the crushing action at this time, but the crushing along the circumferential direction is mainly done by the wedge action of member (3), and the existing pipe (A) is crushed along the circumferential direction. (A
The crushed pieces (9) separated and crushed from ) are simultaneously pushed outward in the radial direction of the pipe.

In addition, depending on the degree of corrosion of the existing pipe (A) and the presence or absence of damage, the second
Alternatively, it may be crushed by the pressure applied by the third wheels (5b) and (5c).

The pushing-back member (3) is provided with a crushing rib (8) protruding outward in the radial direction on the rear side in the moving direction and located at the rear in the wheel body arrangement direction of each wheel group (5). The structure is such that the joint (G) between the existing pipes (A), which requires a large crushing force, can be reliably crushed using the crushing rib (8), and in the unlikely event that the crushing wheel (5d) is used to crush the groove ( Even if a situation occurs in which the fracture does not occur along line B), this crushing rib (8) will prevent the groove from breaking (
E) Care must be taken to ensure reliable crushing along the lines.

The outer diameter (D2) of the cylindrical member (4) is set to be the same as or larger than the outer diameter (D3) of the new pipe (C).
), its outer diameter (D, ) is the outer diameter (A) of the existing pipe (A).
A diameter equal to or larger than D4) is applicable.

[Another example]

(a) The groove-forming wheels serving as the groove-forming means may be arranged one each at predetermined intervals in the circumferential direction.

(o) Instead of the groove-forming transponder, a bit made of cemented carbide may be fixedly disposed to serve as the groove-forming means.

(c) The groove-forming transport body may be a rotary body for cutting, and a driving means for forcibly rotating the rotary body may be provided.

(=) A guide wheel may be provided on the downstream side of the groove forming means in the direction of movement, and is pressed against the existing pipe to the extent that it does not penetrate into the wall thickness of the existing pipe.

0) The pressure crushing means may be implemented by arranging a plurality of ribs in the circumferential direction of the tube, which are in contact with the ends of the pipe, as in the conventional method.

(f) In addition to or in place of the configuration in which the movable body is pulled by a wire, a configuration may be adopted in which a push jack is installed on the Eishin bit side and the movable body is pushed into the existing pipe by this push jack.

(g) It may be used to crush existing pipes such as asbestos pipes, hard vinyl chloride pipes, and humid pipes.

(H) An impact device such as an air hammer may be installed.

Incidentally, although reference numerals are written in the claims section for convenience of reference to the drawings, the present invention is not limited to the structure shown in the accompanying drawings by such entry.

[Brief explanation of drawings]

The drawings show an embodiment of the existing pipe crushing device according to the present invention,
1 and 2 are sectional views of essential parts, FIG. 3 is an overall side view, and FIG. 4 is a schematic diagram showing how to use the device. FIG. 5 is an explanatory diagram of the prior art. (1)...Moving body, (5)...Circle group, (5a), (5b), (5c)...
・Groove-forming transponder, (5d)... Pressurized crushing means,
(A)...Existing pipe, (B)...Inner peripheral surface, (B)...Groove.

Claims (1)

[Claims] 1. A movable body (1) movable along the pipe axis of the existing pipe (A) is provided with a plurality of circumferential locations on the inner circumferential surface (B) of the existing pipe (A) to the outside in the pipe radial direction. In the existing pipe crushing device, the existing pipe crushing device is provided with a pressurizing crushing means (5d) for crushing the existing pipe (A) into a plurality of pieces in the circumferential direction by pressurizing the existing pipe (A) in the circumferential direction. A groove (E) for inducing cracks at a predetermined location of the existing pipe (A) is placed on the inner peripheral surface (B
) A crushing device for existing pipes equipped with a groove forming means. 2. The groove forming means includes rotatable groove forming wheels (5a), (5b), (5c) disposed at predetermined intervals in the circumferential direction.
) The crushing device for existing pipes according to claim 1. 3. A wheel group (5) in which the groove forming means includes a plurality of rotatable groove forming wheels (5a), (5b), and (5c).
A plurality of groove-forming rings (5a), (5b), (5c), which are arranged at predetermined intervals in the circumferential direction and constitute each of the ring groups (5), are: The groove (E
), the depth of the groove forming wheel (
The crushing device for existing pipes according to claim 1, wherein the crushing device for existing pipes is arranged to be further deepened at 5b or 5c). 4. The groove forming wheels (5a), (5b), and (5c) are constituted by rotating bodies for cutting, and these rotating bodies (5a), (5
The existing pipe crushing device according to claim 2 or 3, further comprising a driving means for driving and rotating b) and (5c).