JPH08303177A - Underground conduit crusher - Google Patents

Abstract

PURPOSE: To improve workability by a method wherein a bottom member is installed on the main-body base of a hydraulic cylinder while a crushing block is fitted on the piston rod side of a cylinder body by a magnet and only the cylinder body is drawn out previously after crushing. CONSTITUTION: An underground conduit crusher 1 is inserted into an underground conduit made of concrete, and a cylinder body 2 is supplied with a working fluid. A crushing block 20 is pushed up through a piston 3 and a piston rod 4 by oil pressure, and the conduit is crushed. Since the area of an abutting section 21 is made smaller than the base area of the block 20 at that time, stress pushing the conduit is increased and the conduit is easy to be crushed. Since the outer circumferential surface of the block 20 is formed in a tapered shape, the block 20 is difficult to bite into concrete. When the block 20 bites into concrete and the crusher 1 is not extracted, the cylinder body 2 is pulled out and taken out by force stronger than a magnet 23, and the block 20 is brought out. Accordingly, the crusher can be extracted easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crusher for a concrete underground pipe, and more particularly to an underground crusher for crushing the pipe by applying outward stress from the inside of the pipe. It is a thing.

[0002]

2. Description of the Related Art Conventionally, as a crusher for a concrete underground pipe, an underground pipe crusher described in Japanese Utility Model Laid-Open No. 2-58082 is known.

In this underground pipe crusher, a bottom member is fixed to the bottom surface of a cylinder body of a hydraulic cylinder, a crushing block is fixed to a piston, and the piston is constantly urged in a backward direction by a compression spring to The stroke is such that the length between the bottom member and the outer diameter of the crushing block at the time of the last retraction of the piston is smaller than the hole diameter of the cable insertion hole of the underground pipeline, and the above-mentioned length when extended is that of the insertion hole of the underground pipeline. It is set to be larger than the hole diameter.

In the above crusher, when the crusher is inserted into a concrete underground pipe and the hydraulic cylinder is operated, the bottom member and the crushing block exert an outward internal stress on the underground pipe, This allows the underground conduit to be crushed.

[0005]

However, since the bottom member and the crushing block are fixed to the cylinder body and the piston rod by screws, respectively, the bottom member or the crushing block is caught in the concrete due to the pressure at the time of crushing. It may not come off easily. In this case, if the crusher is forcibly pulled out, the above-mentioned screw may be bent by the shearing force, and the pipe line must be broken by another tool to take out the crusher.

Further, instead of the above-mentioned screw, a rubber ring is attached around the cylinder body, the bottom member and the crushing block, and the bottom member and the crushing block are attached to the cylinder body so as to be easily detached from each other. It is conceivable to pull out the cylinder body while leaving them when they are bitten in concrete, and then take out the bottom member or the crushing block left in the pipeline by another method, but since the rubber ring is easily cut, There was the inconvenience of having to replace the rubber ring each time.

Therefore, an object of the present invention is to improve the efficiency of the pipe crushing work by attaching the crushing block by a reliable means such as a rubber ring which is easy to come off but has no inconvenience.

[0008]

In order to solve the above problems, according to the present invention, a bottom member is provided on the bottom surface of the cylinder body of a hydraulic cylinder, and a crushing block is attached to the piston rod side of the cylinder body to provide the piston. The stroke between the bottom member and the outer diameter of the crushing block when the piston is last retracted is smaller than the hole diameter of the cable insertion hole of the underground pipeline, and the above length is extended when the cable is inserted into the underground pipeline. In the underground conduit crusher set to be larger than the hole diameter of the hole, a structure in which the crushing block is attached to the cylinder body by a magnet is adopted.

Further, an abutting portion is provided on an outer peripheral surface of the crushing block opposite to the inner surface of the underground conduit on the side opposite to the piston rod, and the outer peripheral surface of the contact portion corresponds to the inner surface shape of the inner surface of the underground conduit. It is possible to adopt a configuration in which the outer peripheral surface is formed in a tapered shape from the four edges of the abutting portion to each bottom portion of the crushing block.

[0010]

When the above underground pipe crusher is inserted into the cable insertion hole of the underground pipe at a predetermined position to supply hydraulic pressure, the bottom member and the crushing block press the inner wall of the cable insertion hole, and the inside is directed outward. Exert stress. As a result, the underground pipeline is cracked and the underground pipeline is crushed.

In this case, since the crushing block is attached to the cylinder main body by the magnet, when the crusher is inserted into the cable insertion hole at the predetermined position, the crushing block is integrated with the cylinder main body without any trouble. it can.

Further, since the outer peripheral surfaces of the crushing block are formed in a taper shape from the four edges of the contacting portion of the crushing block to the bottoms of the crushing block, stress concentrates on the contacting portion during crushing and the underground pipeline The crushing block becomes easier to crush, and the contact portion and the tapered outer peripheral surface form an obtuse angle, which makes it difficult for the crushing block to be caught in the concrete. Even if the crushing block gets caught in concrete and it becomes difficult to take out the crusher, if you pull out the cylinder body with a force stronger than the magnet's attractive force, you can leave the crushing block inside and leave only the cylinder body with a cable insertion hole. Can be pulled out from within. In this case, the crushing block left inside is taken out by a worker by pushing in a burl or the like to remove the biting state.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of an underground conduit crusher will be described below with reference to FIGS.

The underground pipe crusher 1 is, as shown in FIG.
It comprises a cylinder body 2, a crushing block 20 attached to the cylinder body 2, and a bottom member 30.

The outer peripheral surface of the crushing block 20 is shown in FIG.
As shown in FIG. 3, a contact portion 21 having an area smaller than the bottom area of the crushing block 20 is provided by projecting the center of the outer peripheral surface of the crushing block 20, and the outer peripheral surface of the contact portion 21 is As shown in FIG. 5, it is formed so as to correspond to the inner surface shape of the cable insertion hole 41. This contact part 2
As shown in FIGS. 2 and 5, the outer peripheral surface of each crushing block 20 is formed in a tapered shape from the four edges of the crushing block 20 to each bottom portion.

As shown in FIG. 5, the outer peripheral surface of the bottom member 30 is formed so as to correspond to the inner surface shape of the cable insertion hole 41.

A piston 3 is provided in the cylinder body 2 as shown in FIG.
A piston rod 4 is attached to the, and an O-ring 5 is fitted on the outer peripheral surface of the piston 3. As shown in FIG. 5, a bush 13 is attached to the opening of the cylinder body 2, and the stroke of the piston 3 is limited by the piston 3 coming into contact with the bush 13.

When the stroke of the piston 3 is set such that the length between the bottom member 30 and the outer diameter of the crushing block 20 when the piston 3 is finally retracted is smaller than the diameter of the cable insertion hole 41,
Moreover, the length is set to be larger than the diameter of the cable insertion hole 41 at the time of extension, that is, when the piston 3 contacts the bush 13.

The one end surface of the cylinder body 2 is shown in FIG.
As shown in FIG. 2, a supply port 9 is provided, and the pressure chamber 6 is supplied from the supply port 9 through the supply inner pipe 8.
Is supplied with hydraulic oil. As shown in FIGS. 1 and 2, an operation rod 10 is attached to one end surface of the cylinder body 2.

A bottom member 30 is attached to the bottom surface of the cylinder body 2 as shown in FIGS. A groove 31 is provided on an inner surface of the bottom member 30 which is in contact with the bottom surface of the cylinder body 2, and a magnet 32 is provided in the groove 31.
Embedded in the bottom member 30 due to the attractive force of the magnet 32.
Is attached to the bottom surface of the cylinder body 2.

Piston rod 4 of the cylinder body 2
On the side, as shown in FIGS. 1 and 2, the crushing block 20
Is attached. A groove 22 is provided on the inner surface of the crushing block 20 similarly to the groove 31.
A magnet 23 is embedded inside, and the crushing block 20 is attached to the cylinder body 2 by its attracting force like the magnet 32.

As shown in FIGS. 1 and 2, on the side of the supply port 9 of the cylinder body 2, a positioning pin 12 is inserted into a hole 14 provided in the cylinder body 2,
Both ends of the pin 12 are projected to the piston rod 4 side and the bottom side of the cylinder body 2, respectively. The crushing block 20 and the bottom member 30 facing both ends of the pin 12
As shown in FIG. 1 and FIG. 2, holes 24 and 24 ′ are provided in each of them.

Cylinder body 2 of the crushing block 20
As shown in FIGS. 1 and 2, a projecting piece 25 is provided at a portion of the bottom member 30 which is in contact with the other end surface of the bottom member 30, which is in contact with the other end surface of the cylinder body 2. Is provided with a protruding piece 33 similar to the protruding piece 25. The protruding pieces 25 and 33 can be omitted when the attraction force between the magnet 23 and the magnet 32 is increased.

When the cable insertion hole 41 is crushed by the above underground conduit crusher 1, the handle of the operating rod 10 is operated to insert the cable through the underground conduit crusher 1 as shown in FIG. It is inserted into the hole 41 at a predetermined position. In this case, the operating rod 10
When the underground pipe crushing machine 1 is pushed into the cable insertion hole 41 by pushing, the crushing block 20 and the bottom member 30 move to the magnet 2
The cylinder body 2 and the crushing block are attached to the cylinder body 2 by 3, 32, and the other end surface of the cylinder body 2 contacts the crushing block 20 and the inner surfaces of the projecting pieces 25, 33 of the bottom member 30. 20 and the bottom member 30 are inserted into the cable insertion hole 41 while being integrated.

Next, when hydraulic fluid is supplied into the pressure chamber 6 of the cylinder body 2, the hydraulic pressure pushes up the piston 3 and the piston rod 4. At the same time, since the crushing block 20 is pushed up and the contact portion 21 of the crushing block 20 presses the inner diameter of the cable insertion hole 41,
The underground conduit 40 is cracked and the underground conduit 40 is crushed.

In this case, as shown in FIGS. 1 to 3, since the area of the contact portion 21 is smaller than the bottom area of the crushing block 20, the area of the contact portion 21 is smaller than the bottom area of the crushing block 20. Compared to the one formed in the same size as
The stress when pressing the underground conduit 40 becomes large, and the underground conduit 4 becomes
It becomes easy to crush 0. Further, as shown in FIGS. 2 and 5, the outer peripheral surface is formed in a tapered shape from the four edges of the contact portion 21 of the crushing block 20 to the respective bottom portions of the crushing block 20, so that the contact portion 21 is The tapered outer peripheral surface has an obtuse angle (θ). Therefore, the crushing block 20 is unlikely to be caught in the concrete. Even if the crushing block 20 or the bottom member 30 gets into the concrete and it becomes difficult to take out the crusher, the magnet 23,
When the cylinder body 2 is pulled out with a force stronger than the suction force of 32, only the cylinder body 2 can be pulled out from the cable insertion hole 41 while leaving the crushing block 20 or the bottom member 30 inside. In this case, when the biting portion of the crushing block 20 or the bottom member 30 left in the cable insertion hole 41 is pierced by a burl or the like, the biting is released, and this can be taken out to the outside.

A second embodiment of the underground conduit crusher is shown in FIGS. 6 and 7.

As shown in FIGS. 6 and 7, the underground conduit crusher 50 has a bottom member 65 integrally formed on the bottom surface of the cylinder body 51.

The crushing block 60 is attached to the piston rod 53 side of the cylinder body 51 by the attraction force of the magnet 63 as in the first embodiment.

On the outer peripheral surface of the crushing block 60, the first
Similar to the embodiment, the contact portion 61 is provided by projecting the center of the outer peripheral surface of the crushing block 60, and the contact portion 61.
The outer peripheral surface of is formed so as to correspond to the inner surface shape of the cable insertion hole. The outer peripheral surface of each contact portion 61 is formed in a tapered shape from the four edges to each bottom portion of the crushing block 60.

The outer peripheral surface of the bottom member 65 is formed so as to correspond to the inner surface shape of the cable insertion hole as in the first embodiment.

When the cable insertion hole is crushed by the above underground conduit crusher 50, the operation rod 6 is used as in the first embodiment.
The handle 8 is operated to insert the underground pipe crusher 50 into a predetermined position in the cable insertion hole.

Next, when hydraulic oil is supplied into the pressure chamber 55 of the cylinder body 51, the hydraulic pressure pushes up the piston 52 and the piston rod 53. At the same time, the crushing block 60 is pushed up and its contact portion 61
Presses the inner diameter of the cable insertion hole, so that the underground conduit is crushed as in the first embodiment.

In this case, the contact portion 61 of the crushing block 60
Since the outer peripheral surface of each of the four sides of the crushing block 60 is formed in a taper shape over each bottom side, the underground pipe line is easily crushed as in the first embodiment, and the crushing block 60 bites into concrete. It becomes difficult to be crowded.

[0035]

[Effect] As described above, according to the present invention, since the crushing block is attached to the cylinder body by the magnet, the crushing block is caught in the concrete and it becomes difficult to take out the underground conduit crusher. However, the crushing block can be easily separated from the cylinder body. Thereby, only the cylinder body can be pulled out from the cable insertion hole, and the crushing block left in the cable insertion hole can be taken out and attached to the cylinder body again, so that the pipe line crushing operation can be continued.

Further, since the outer peripheral surface is formed in a taper shape from the four edges of the contact portion of the crushing block to each bottom of the crushing block, it is easy to crush the underground pipeline and the crushing block is made of concrete. It becomes difficult to bite into. This can save the trouble of taking out the crushing block left in the cable insertion hole, and further improve the work efficiency.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of an underground conduit crusher.

FIG. 2 is a partially cutaway side view of the above.

FIG. 3 is a plan view of the same as above.

FIG. 4 is a perspective view showing a usage state of the same as above.

FIG. 5 is a front view showing the same usage state as above.

FIG. 6 is an exploded perspective view showing a second embodiment of the underground pipe crusher.

FIG. 7 is a partially cutaway side view of the above.

[Explanation of symbols]

 1 underground pipe crusher 2 cylinder body 3 piston 4 piston rod 5 O-ring 6 pressure chamber 8 supply inner pipe 9 supply port 10 operation rod 11 supply outer pipe 12 pin 13 bush 14 hole 20 crushing block 21 contact part 22 groove 23 magnet 24 hole 24 'hole 25 protruding piece 30 bottom member 31 groove 32 magnet 33 protruding piece 40 underground conduit 41 cable insertion hole 50 underground conduit crusher 51 cylinder body 52 piston 53 piston rod 54 O-ring 55 pressure chamber 56 inner supply pipe 57 hole 58 pin 59 bush 60 crushing block 61 contact part 62 groove 63 magnet 64 hole 65 bottom member 66 supply port 67 outer supply pipe 68 operating rod

Claims (2)

[Claims] 1. A bottom member is provided on the bottom surface of a cylinder body of a hydraulic cylinder, and a crushing block is attached to the piston rod side of the cylinder body so that the stroke of the piston can be determined by the bottom member and the crushing block outer diameter when the piston is finally retracted. Underground conduit crusher set so that the mutual length is smaller than the hole diameter of the cable insertion hole of the underground conduit and the above length is larger than the hole diameter of the cable insertion hole of the underground conduit when extended. In the underground pipe crushing machine, the crushing block is attached to the cylinder body by a magnet. 2. An abutment portion is provided on an outer peripheral surface of the crushing block, which is opposite to the inner surface of the underground conduit on the side opposite to the piston rod,
The outer peripheral surface of the abutting part is formed so as to correspond to the inner surface shape of the inner surface of the underground pipe, and the outer peripheral surface is formed in a taper shape from the four edges of the abutting part to each base of the crushing block. The underground pipeline crusher according to claim 1.