JPH1024271A - Device for removing foreign matter in pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for removing the foreign matter in a pipeline capable of efficiently removing the foreign matter in the pipeline with more powerful cutting power without damaging the inside surface of the pipeline existing in a normal position by holding a rotary cutter at the approximate center of the pipeline. SOLUTION: This device 1 for removing the foreign matter in the pipeline has a fluid pressure motor mounted with a cutter 5 at an output shaft and is constituted by mounting a prescribed guide roller 9 at a device body 2 via liquid pressure cylinders 6, 7 or a spring 8 to make this guide roller movable radially in the pipeline and to absorb the differences in level of the inside surface of the pipeline. The device has a mechanism for absorbing the differences in the level in the pipeline constituted by combining the guide roller 9 made movable radially in the pipeline by the liquid pressure cylinders 6, 7 or the spring 8 and a guide roller 10 fixed in the position. As a result, the center misalignment of the device body 3 is minimized and the cutter 5 is positioned at the approximate center of the pipe. The cutter is thus prevented from coming into contact with the inside surface of the pipeline and from damaging the inside surface of the pipeline.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid pressure motor having a cutter mounted on an output shaft, which is installed inside a pipe or the like buried underground, and moves inside the pipe to rotate the cutter. And a device for removing foreign matter inside the pipeline by the method.

[0002]

2. Description of the Related Art Pipes and sewers buried underground are:
Concrete that has been flushed with water may be solidified inside, or a ground connection or a road construction may cause a gap in a connection portion of a pipeline due to displacement, and a level difference may occur in the pipeline. In addition, the chemical injection for solidification causes solids to form inside the leaking pipe through the gap, or causes roots of trees to enter the pipe, thereby blocking the pipe. Conventionally, the following methods have been used to remove such steps in the pipeline and foreign matters in the pipeline. First, a cleaning method using a water jet, and then, a device equipped with a shaft having a cutter attached to the tip is inserted into a pipe, and the cutter is rotated by an electric or hydraulic drive source outside the pipe to remove foreign matter. It is. Attach a cutter to the output shaft of the hydraulic motor,
A method of removing foreign matter by pushing it into a pipe has also been employed.

[0003]

However, the prior art has the following problems. First of all, it was difficult to remove hard objects by fluid cleaning using a water jet. However, this was solved to some extent by rotating the spray nozzle and controlling its rotation. However, it was not possible to sufficiently remove hardened materials such as concrete and mortar in the pipeline by the impact force of the water jet alone. Next, in a device using a rotating cutter, there is a method of transmitting the rotation of a driving source outside the tube to a cutter at the tip through a number of shafts to remove foreign substances. The loss was large and the driving source required a large power. Further, when the conduit is bent, the shaft or the joint may come into contact with the inner surface of the conduit, and the conduit may be damaged. When removing a foreign object by pushing a hydraulic motor with a cutter attached to the output shaft into the pipeline, two hydraulic hoses are required, one on the feed side and the other on the return side. Had become. In addition, there is a problem of chip discharge, and it is necessary to consider a process in the event of oil leakage.

Further, the rotating cutter must be located substantially at the center of the pipe, and the main body of the apparatus is fixed from the center position due to irregularities in the pipe, residual steps that cannot be completely removed by the cutter, and accumulation of foreign matter. If the cutter is displaced more than the amount or the cutter is tilted, unnecessary contact with the pipe wall at a normal position may occur, and the pipe wall may be damaged. Further, it is impossible to connect a rope to the front side of the cutter of the apparatus and to pull the rope in the longitudinal direction as it is because the rope is twisted by the rotation of the cutter. Therefore, it can be pulled only from the side opposite to the cutter, and handling of the device is inconvenient. Also, when the cutter is placed on the inner surface of the pipeline during the removal operation, it is not always possible to see the entire device. Is not located approximately in the center of the pipeline, it is not possible to know that unnecessary contact occurs.

[0005]

According to a first aspect of the present invention, there is provided an apparatus for removing foreign matter in a pipeline, comprising: a fluid pressure motor having a cutter mounted on an output shaft; and a front guide for guiding the apparatus body in a longitudinal direction of the pipeline. The apparatus is characterized in that it has three or more rollers and three or more rear guide rollers, and the front guide roller arranged on the lower half side of the apparatus is movable in a pipe radial direction via a step absorbing means. The apparatus for removing foreign matter in a pipe according to claim 2 of the present invention, wherein the front lower half side guide roller movable in the pipe radial direction is locked to the apparatus main body via a spring as the step absorbing means, and has a force. And is pressed against the inner surface of the pipeline.

According to a third aspect of the present invention, there is provided an apparatus for removing foreign matter in a pipe according to the first and second aspects of the present invention, wherein the foreign matter is locked by a fluid pressure cylinder and a force is applied thereto. Movable guide rollers are arranged on the upper half side of the front part of the apparatus and the upper half side of the rear part of the apparatus, and the guide rollers on the upper half side of the rear part of the apparatus are pressed against the inner surface of the pipe, and the high-pressure fluid for operating the fluid pressure motor is discharged. The fluid pressure cylinder is also operated. According to a fourth aspect of the present invention, there is provided an apparatus for removing foreign matter in a pipe according to any one of the first to third aspects, wherein the shaft has a mechanism for absorbing rotation at a center position of the front surface of the cutter. It is characterized by having a joint.

[0007]

The apparatus for removing foreign matter in a pipeline according to the present invention generates a cutting force by the rotation of a cutter, and can cut hardened foreign matter, such as concrete or mortar, or the root of a tree. Can be cut off from the inside. In addition, by applying a force to the guide roller and pressing the guide roller against the inner surface of the pipeline, the frictional force at the contact portion between the guide roller and the inner surface of the pipeline can be increased. can do. In other words, since the cutting force of the cutter can be increased, even harder objects can be removed, and a more reliable removal operation can be performed. By moving the guide roller relatively to the apparatus in the radial direction of the pipe, the guide roller pipe is formed by unevenness of the inner surface of the pipe itself, residual steps that cannot be completely removed by the cutter, or unevenness due to accumulated foreign matter. Absorbs radial movement and minimizes misalignment of the device body in combination with fixed guide rollers. Therefore, the center of the cutter can be kept substantially at the center of the conduit, and the cutter does not contact the normal inner surface of the conduit, so that the inner surface of the conduit is not damaged.

By using a fluid pressure cylinder or a spring as a means for applying a force to the movable guide roller and pressing the movable guide roller against the inner surface of the conduit, the former can maintain a constant force even if the guide roller is displaced by irregularities in the conduit. And the latter can produce an increase in the opposite force proportional to the displacement increase. Furthermore, an automatic alignment mechanism that minimizes misalignment can be provided by combining fixed guide rollers that displace without absorbing irregularities and that do not move in the radial direction of the pipe relative to the apparatus. If the supply of high-pressure fluid is stopped at the end of the removal operation, the piston of the hydraulic cylinder comes to the lowest position of the cylinder, so the guide roller connected to the hydraulic cylinder stops contact with the inner surface of the pipeline, and There is no resistance when moving. Therefore, it is easy to move the foreign matter removing device in the pipeline after the work is completed.

Guide rollers are arranged at the front and rear portions of the apparatus, and the guide rollers arranged at the lower half of the front portion are movable relative to the apparatus in the radial direction of the pipe via springs as step difference absorbing means. By doing so, the guide roller on the lower front half side escapes in the radial direction of the pipeline when going over a step in the pipeline, minimizing the misalignment of the main body of the device, and using an automatic centering mechanism on the front of the cutter. Can be. Alternatively, guide rollers are located at the front and rear of the device,
The guide rollers disposed on the front upper half side and the rear upper half side are relatively movable with respect to the apparatus in the pipe radial direction, and a force is applied by a fluid pressure cylinder, and the guide rollers on the rear upper half side of the apparatus are moved. Pressing against the inner surface of the conduit, the guide roller arranged on the lower front half side is movable relative to the device in the radial direction of the conduit, applying force by a spring and pressing against the inner surface of the conduit, and pressing the lower rear half side. By fixing the arranged guide rollers other than the rotation of the rollers, it is possible to more stably minimize the misalignment of the apparatus main body and to provide the cutter front face with an automatic centering function. In order to prevent the contact position of the guide roller, which is arranged on the upper half side of the front part of the apparatus via the locking means, with the inner surface of the pipe from expanding beyond the pipe radius, the hydraulic cylinder attached to the locking means Outward movement of the inner piston is constrained. Therefore, the guide roller on the upper half side of the front part of the apparatus is usually in this restraint position during the operation. Further, the fluid pressure cylinder presses the guide roller to a restraining position with a stronger force than a spring attached to a guide roller disposed on the lower half side of the front part of the apparatus via a locking means. For this reason, the guide roller on the spring side escapes in the radial direction of the pipeline when overcoming a step in the pipeline, while the hydraulic pressure cylinder hardly escapes in the radial direction of the pipeline. Has become.

Further, when the supply of high-pressure fluid is stopped in order to stop the cutter after the removal operation, not only the hydraulic motor is stopped but also the piston of the hydraulic cylinder is located at the lowest part in the cylinder. The movable guide roller locked by the pressure cylinder is separated from the inner surface of the pipeline. Therefore, the guide rollers on the upper half side of the front part and the rear part of the apparatus do not become a resistance when the apparatus moves, and the movement of the apparatus becomes easy. As another configuration, the guide rollers are arranged at the front and rear of the device, and the guide rollers arranged at the lower half of the front of the device and the upper half of the rear of the device are movable in the radial direction of the pipeline, and force is applied by a spring. Then, the guide rollers disposed on the front upper half side and the rear lower half side are fixed, and a more stable self-centering function can be provided. In the arrangement of the guide rollers of the apparatus of the present invention, the rear guide rollers of the apparatus are located far away from the cutter section in the axial direction of the apparatus, and even if there is a step, the distance between the front and rear guide rollers is large. Is much larger than the distance between the front guide roller and the cutter section, so the effect on the cutter center is a slight misalignment, and furthermore, the hydraulic cylinder or the hydraulic cylinder that locks the rear upper half guide roller Since the spring absorbs the step, the cutter can be cut at a substantially central position without any problem.

By providing a shaft coupling having a mechanism for absorbing rotation by sliding or rolling on the front surface of the center of the cutter, the rotation of the cutter is not transmitted to a rope or the like, so that the twist of the rope or the like does not occur and the cutter is not twisted. The device can be pulled in the longitudinal direction by a rope or the like from the front side. By ejecting the discharge fluid or high-pressure supply fluid of the fluid pressure motor from the injection port to the front of the device and causing the drilling debris to flow out, it is possible to prevent the cutting debris from accumulating at the cutting location and eliminate obstacles to cutting and device propulsion. The work efficiency can be further improved because the cutter can be cooled and the cutting can be performed without causing the clogging of the cutting waste. The vertical movement of the lever connected to the piston or spring of the hydraulic cylinder is related to the radial movement of the guide roller in the pipeline. The radial movement of the guide rollers at the front of the device is related to the distance between the cutter and the normal inner circumferential surface of the conduit. Therefore, the distance between the cutter and the inner peripheral surface of the pipeline is detected by the movement of the lever at the front of the apparatus, and a limit switch is activated to issue an alarm, thereby avoiding contact between the cutter and the normal inner surface of the pipeline.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus for removing foreign matter in a pipeline according to the present invention will be described with reference to the drawings. As shown in FIG. 1, the apparatus 1 for removing foreign matter in a pipe is disposed in a pipe 19 underground so as to pass through a manhole 15, and moves in the pipe 19 to attach the cutter 5 to a tip portion. (Not shown) to remove foreign matter 13, tree roots 14, and steps in the pipeline generated after the installation of the pipeline. A high-pressure hose 4 is connected to the non-cutter side of the foreign matter removing device 1 in the pipeline,
High-pressure water is supplied from a high-pressure pump car 16 for driving a hydraulic motor.

A rotation absorbing joint 11 is attached to the center of the tip of the cutter 5 of the apparatus 1 for removing foreign matter in a pipe, and the apparatus 1 can be moved toward the cutter 5 by connecting a rope 12 and pulling the rope 12. it can. The rope 12 is towed through an intermediate pulley 18 by a manual or automatic winch 17 located on the ground near another manhole 15. When the apparatus 1 moves, the rotary cutter 5 removes the foreign matter 13, the tree roots 14, the steps, and the like in the pipeline 19. The device 1 can be retrieved through said other manhole 15 or moved in the next pipeline towards the next manhole. If the propulsion shaft 3 is connected to the device 1,
The device 1 can be pushed or pulled via the propulsion shaft 3. Further, by connecting a plurality of propulsion shafts 3 and thereby pushing or pulling the device 1, it is possible to move a predetermined distance without connecting a rope, and it can also be used for a totally closed conduit.

FIG. 2 shows the structure of the foreign matter removing device 1 in a pipeline. The device 1 has a built-in hydraulic motor (not shown), the output shaft of which protrudes from the device main body 2, and a cutter 5 is rotatably mounted. The rotation of the cutter 5 causes the pipeline 19
The foreign matter 13 accumulated in the inside, the root of the tree, and the step of the pipeline caused by the displacement after the pipeline is installed are cut and removed. The outer diameter of the cutter 5 is slightly smaller than the inner diameter of the conduit 19. The high-pressure water introduced into the apparatus main body 2 from the high-pressure water generator is discharged by driving a hydraulic motor, and a part of the high-pressure water introduced into the apparatus main body is sprayed on the front side surface of the apparatus main body 2. It is sprayed downward from the port 23 on the side of the cutter 5 in the direction of the cutter 5 to cool the cutter portion and to wash away cutting chips. Several holes are formed in the jet water passage portion of the cutter side wall so that most of the jet water passes therethrough.

At the center of the tip of the cutter 5, a rotation absorbing joint 1 is provided.
1 is attached. The rotation absorbing joint 11 has a thrust bearing, and can rotate one end and not rotate the other end. The rotating end is connected to the center of the tip of the cutter, and the rope 12 is connected to the non-rotating end. The propulsion shaft 3 can be attached to the end face of the apparatus main body 2 opposite to the cutter, and the apparatus 1 can be moved by pushing or pulling the apparatus 1.

The apparatus 1 has a plurality of front guide rollers 9 and a rear guide roller 10. The front guide roller 9 and the rear guide roller 10 are respectively arranged in the circumferential direction. In the present embodiment, as shown in FIG. 3, the upper half side is one, and the lower half side is two. Can be. The guide rollers 9 and 10 come into contact with the inner surface of the conduit to guide the longitudinal movement of the device 1 in the conduit so that the device can be moved smoothly. Since the foreign matter is most likely to be deposited near the center of the lower part of the conduit, the guide rollers 9 and 10 are desirably arranged to avoid this location.

Guide rollers 9, 10 excluding the rear lower half side
Is connected to one end of a horizontally arranged arm 20, 21 via a pin, and the other end of the arm 20, 21 is connected to a substantially central protrusion of the apparatus main body 2 via a pin 22. The guide rollers 9 and 10 can move up and down around the connection pin 22 as a fulcrum. Horizontal arms 2 for front upper half and rear upper half guide rollers
At the approximate center of 0 and 21, cylinders 6 and 7 are connected to the apparatus main body, and a through hole is provided at a connection portion so as to guide high-pressure water introduced into the apparatus main body also into the cylinder.
Furthermore, the piston in the cylinder is connected to the horizontal arm via a pin, and high pressure water is introduced into the cylinder during operation of the device, and the piston is pushed to apply force to the guide roller. It is pressed against the inside of the road. In order to prevent the contact position of the guide roller disposed on the upper half side of the front part of the apparatus via the locking means with the inner surface of the pipe from expanding beyond the pipe radius, the inside of the fluid pressure cylinder attached to the locking means is fixed. Outward movement of the piston is restricted. Therefore, the guide roller on the upper half side of the front part of the apparatus is normally in this restraint position during the operation.

The lower end of a lever supported by a spring 8 is attached to a horizontal arm 20 for a guide roller on the lower front half side via a pin. The upper end of the spring 8 is similarly connected to the apparatus main body 2 via a pin. The vertical lever is inserted into the spring 8 and the guide roller 9
If the horizontal arm 20 is tilted due to the vertical movement of the spring 8, the force applied to the guide roller changes due to the expansion and contraction of the spring 8. The horizontal arm 20 is adjusted to be in the horizontal position even when a force due to its own weight is applied by the spring 8 and the vertical lever. The rear lower half side guide roller 10 can rotate only the roller, and its position with respect to the apparatus main body 2 is fixed.

The guide rollers 9 and 10 on the front lower half and the rear upper half are made movable in the radial direction of the pipe, and a force is applied by a spring 8 to fix the positions of the guide rollers on the front upper half and the rear lower half. It may be. The guide roller spring 8 on the rear upper half side may be adjusted so that a force is applied to the guide roller 10 when the mounted horizontal arm 21 is in a horizontal position in a compressed state. The guide rollers on the lower front half of the apparatus and the upper half on the rear of the apparatus are moved in the radial direction of the pipe relative to the apparatus in order to absorb irregularities on the inner surface of the pipe. The guide roller in the lower half of the rear part of the device
The most preferable self-centering is a case in which the pipe moves along the unevenness of the inner surface of the pipeline without absorbing the unevenness of the inner surface of the pipeline and does not or hardly move in the radial direction of the pipeline relative to the device. Mechanism. Here, for example, the guide rollers at the front of the apparatus are all movable in the radial direction of the pipeline, and the guide rollers on the upper half side of the front of the apparatus are locked by a hydraulic cylinder so that the contact position with the inner surface of the pipeline is determined by the radius of the pipeline. In order to prevent the piston from being spread as described above, the outward movement of the piston in the fluid pressure cylinder is restrained, the guide roller on the lower half of the front part of the apparatus is locked by a spring, and the guide roller on the upper half of the apparatus front is fixed to the apparatus. A force may be applied to the outside in the pipe radial direction with a stronger force than the guide roller on the lower front half side. in this case,
The guide roller in the upper half of the front part of the apparatus is normally in this restrained position during operation. Further, the guide roller in the lower half of the front part of the apparatus causes relative movement in the radial direction of the conduit, but the guide roller in the upper half of the front part of the apparatus hardly causes relative movement in the radial direction of the conduit.

The vertical movement of the horizontal arm 20 for the guide roller 9 on the front upper half side and the front lower half side near the guide roller is detected by a limit switch attached to the apparatus main body, and the cutter 5 and the normal position are detected. The contact point of the limit switch can be made to work immediately before the guide roller 9 comes to a position where it comes into contact with the inner surface of the pipe line 19 located at the position. It is also possible to arrange the hydraulic motor built-in part of the device so that the center position of the rear half of the device from the approximately central projecting portion of the device to which the arm is connected is lower than the center position of the rotary cutter, which is substantially aligned with the center in the pipeline, A weight 24 can be attached to the lower part of the center of the apparatus main body 2. As a result, the center of gravity of the device is lower than the center, so that the upper guide roller is in a non-pressure state at the end of the work and the vertical relationship of the device main body is maintained when pulled with a rope etc. 2 The whole is stabilized. A worm or a gear may be attached to a position inside the cutter of the hydraulic motor output shaft, and the roller may be rotated in accordance with the rotation of the cutter unit via a gear installed coaxially with the roller, so that the apparatus can be self-propelled.

[0021]

In the apparatus for removing foreign matter in a pipe according to the present invention, hard foreign matter, tree roots and the like inside the pipe which cannot be removed by a water jet due to the strong cutting force of the rotary cutter are separated from the pipe inner surface and removed. can do. Since a force is applied to the guide roller and pressed against the inner surface of the conduit, a large cutting force exceeding the rotational drag generated by its own weight can be applied to the rotary cutter without causing rotation of the apparatus. Therefore, the foreign matter removing power can be greatly increased, and the removing operation efficiency has been greatly increased.

By moving the guide roller in the radial direction of the pipe relative to the apparatus main body, a guide generated due to unevenness of the inner surface of the pipe itself, a residual step that cannot be completely removed by a cutter, or unevenness due to accumulated foreign matter or the like. By absorbing the movement of the roller in the radial direction of the pipe, the misalignment of the apparatus main body can be minimized by combining with the fixed guide roller to keep the apparatus in a stable state. Therefore, the center of the cutter can be kept substantially at the center of the pipeline, and the cutter does not contact the inner surface of the pipeline at a normal position, and does not damage the inner surface of the normal pipeline. By using a hydraulic cylinder or a spring as a means for applying a force to the movable guide roller and pressing it against the inner wall of the conduit, in the former, the force can be kept constant even if the guide roller is displaced by irregularities in the conduit, The latter can produce an increase in the opposite force proportional to the displacement increase. Further, by combining a fixed guide roller that moves along the inner surface of the pipeline without absorbing the unevenness of the pipeline, a stable unevenness level difference absorbing mechanism can be obtained. Therefore, the cutter center prevents the misalignment of the apparatus main body can be a kept substantially pipe center, without the cutter is in contact with the pipe inner surface in the normal position, without causing damage to normal pipeline inner surface . Therefore, if the supply of high-pressure fluid is stopped at the end of the removal operation, the piston of the hydraulic cylinder comes to the lowest position of the cylinder. Stop contact with the inner surface of the pipeline. Therefore, it is easy to move the foreign matter removing device in the pipeline after the work is completed.

Since the rotation absorbing joint is attached to the front of the cutter, the cutter can be pulled in the longitudinal direction from the front of the cutter by a rope or the like without transmitting the rotation of the cutter to the tow rope or the like. Work efficiency can be increased as compared with pushing with a shaft from the side opposite to the cutter. By discharging the cutting waste with the discharge water or the high-pressure jet water of the hydraulic motor, the cutting waste can be prevented from accumulating at the cutting position, and does not hinder cutting of the cutter and device propulsion. In addition, foreign matter removal and cleaning in the tube can be performed simultaneously. For this reason, it is not necessary to take the device out of the pipe every time the waste is discharged, and the working time can be greatly reduced by the continuous work. In addition, by using a single high-pressure water line as the water supply source, accessories of the apparatus can be simplified, and the entire apparatus has a simple structure. In addition, since it is opened from the hydraulic line, there is no need to worry about oil leakage, which is effective in terms of environmental protection.

By providing a limit switch for detecting the vertical movement of the front guide roller horizontal arm, the position of the front guide roller in the pipe radial direction, that is, the distance between the rotary cutter and the pipe inner surface can be detected. A warning can be issued before the inner surface of a pipe in a normal position comes into contact with. Therefore, it is possible to prevent the cutter from being in contact with the normal inner surface of the pipeline, prevent damage to the inner surface of the pipeline, and perform a reliable removal operation.

[Brief description of the drawings]

FIG. 1 is an explanatory view including a peripheral device according to an embodiment of the present invention.

FIG. 2 is a schematic front view of an apparatus for removing foreign matter in a pipe according to an embodiment of the present invention. However, the lower half of the guide roller is a view from the direction perpendicular to the plane including the center axis of the apparatus and the center of the guide roller.

FIG. 3 is a sectional view taken along arrow AA in FIG. 2;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Foreign matter removal apparatus in a pipe line 2 ... Device main body 3 ... Shaft 4 ... High pressure hose 5 ... Cutter 6 ... Front hydraulic cylinder 7 ... Rear hydraulic cylinder 8 ....・ Spring 9 ・ ・ ・ Front guide roller 10 ・ ・ ・ Rear guide roller 11 ・ ・ ・ Rotation absorbing joint 12 ・ ・ ・ Rope 13 ・ ・ ・ Foreign matter 14 ・ ・ ・ Tree root 15 ・ ・ ・ Manhole 16 ・ ・ ・ High pressure pump Car 17 Winch 18 Intermediate pulley 19 Pipe line 20 Front arm 21 Rear arm 22 Pin 23 Injection port 24 Weight

Claims (4)

[Claims] 1. A fluid pressure motor having a cutter attached to an output shaft, and three or more front guide rollers and three or more rear guide rollers for guiding an apparatus main body in a longitudinal direction of a pipe, and are arranged on a lower half side of the apparatus. An apparatus for removing foreign matter in a pipeline, wherein the front guide roller is movable in a radial direction of the pipeline via a step absorbing unit. 2. The front lower half side guide roller movable in the radial direction of the pipeline is engaged with the apparatus main body via a spring as the step absorbing means, and is pressed against the inner surface of the pipeline by applying a force. The apparatus for removing foreign matter in a pipeline according to claim 1, wherein: 3. A movable guide roller which is locked by a fluid pressure cylinder and to which a force is applied is disposed on an upper half side of a front part of the apparatus and an upper half side of a rear part of the apparatus. 3. The foreign matter removing device according to claim 1, wherein a high-pressure fluid that is pressed against an inner surface of the pipeline and operates the hydraulic motor also activates the hydraulic cylinder. 4. 4. The apparatus for removing foreign matter in a pipeline according to claim 1, further comprising a shaft coupling having a mechanism for absorbing rotation at a center position of the cutter front part.