JP2007090498A - Tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply grind a part of a pipe periphery among an outer peripheral surface of a pipe. <P>SOLUTION: A tool used for grinding an outer peripheral surface of the pipe B is equipped with an endless belt 25 having a belt outer peripheral surface 24 capable of grinding the outer peripheral surface of the pipe, a support 26 for rotatably supporting the endless belt, and a driving mechanism 27 capable of driving and rotating the belt. A pair of rollers 31, on which the inner periphery of the endless belt is wound around, are provided so as to be adjacent in the belt rotating direction, and a push-to-operate part 57 is provided so as to push the outer peripheral surface of the belt against the outer peripheral surface of the pipe between the pair of rollers. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a tool used for cutting an outer peripheral surface of a pipe.

In piping work, for example, excavate a pit to expose a buried pipe made of thermoplastic resin such as polyethylene resin, connect a branch pipe made of thermoplastic resin to the buried pipe, or replace part of the buried pipe For this reason, a thermoplastic resin joint or the like is fused to the buried pipe, and prior to the fusion work, the oxide film or the like generated on the outer peripheral surface of the buried pipe must be removed. In this case, a stable fusion strength at the fusion part cannot be obtained.
In such a case, the above tool is used to cut the outer peripheral surface of a tube made of thermoplastic resin. However, the conventional tool has a scraper blade for cutting the outer peripheral surface of the tube on the outer peripheral surface of the tube. The scraper blade is fixed to the pipe so that the scraper blade can be moved around in the contacted state and can be moved back and forth in the axial direction of the pipe along with the round movement. It is configured such that the outer peripheral surface of the pipe can be cut over the entire circumference by rotating around the outer peripheral surface (see, for example, Patent Document 1).

JP-A-6-79501

For this reason, in a conventional tool, a joint that does not need to be fused to the outer peripheral surface of the pipe over the entire circumference, for example, a saddle that has an arc-shaped fusion surface with respect to the outer peripheral surface of the pipe. Even when the provided branch pipe joint with saddle is fused to the outer peripheral surface of the pipe, in order to cut the outer peripheral surface of the pipe, the supporter of the scraper blade is fixed to the pipe, and the scraper blade is moved around the pipe. There is a drawback that it is difficult to simplify the work.
Also, when the buried pipe is exposed by excavating the pit and the branch pipe is connected to the buried pipe via a branch pipe joint with a saddle, the scraper blade can be moved around the pipe. There is a drawback that it is necessary to excavate a large pit and the construction cost becomes high.
This invention is made | formed in view of the said situation, Comprising: It aims at enabling the part range of the pipe peripheral direction of a pipe outer peripheral surface to be easily shaved.

  A first characteristic configuration of the present invention is a tool used to cut an outer peripheral surface of a pipe, and an endless belt having a belt outer peripheral surface capable of grinding the outer peripheral surface of the pipe, and the endless belt rotatably supported And a driving mechanism capable of driving and rotating the endless belt, and a pair of rollers wound around the inner peripheral side of the endless belt are provided adjacent to each other in the belt rotating direction. A pressing operation portion is provided that can be pressed between the pair of rollers toward the outer peripheral surface of the pipe.

[Action and effect]
The outer circumferential surface of the pipe can be cut by pressing the outer circumferential surface of the belt that can grind the outer circumferential surface of the pipe against the outer circumferential surface of the pipe while driving and rotating the endless belt that is rotatably supported. However, a pair of rollers around the inner circumference of an endless belt are provided adjacent to each other in the belt rotation direction, and the outer circumference of the belt can be pushed between the pair of rollers toward the outer circumference of the tube. The endless belt enters between the pair of rollers as the belt outer peripheral surface is pressed from the pipe radial direction toward the pipe outer peripheral surface between the pair of rollers. It transforms into a route along.
Accordingly, the belt outer peripheral surface moves while being pressed over a range of a part of the pipe outer peripheral surface in the pipe peripheral direction between the pair of rollers, and a part of the pipe outer peripheral surface of the pipe peripheral direction moves. Can be easily cut.
When excavating the pit to expose the buried pipe and connecting the branch pipe to the buried pipe via a branch pipe joint with a saddle, the scraper blade should be moved around the pipe as before. The construction cost can be reduced because there is no particular need to excavate such a large pit.
In addition, the outer surface of the pit, that is, the operation of the pressing operation unit from the ground side can be used to press the belt outer surface toward the outer surface of the pipe. There is no particular need for excavation, and construction costs can be further reduced.

  The second characteristic configuration of the present invention is that an urging mechanism for urging in the direction in which the interval between the pair of rollers is opened is provided.

[Action and effect]
A biasing mechanism that biases the gap between the pair of rollers in the opening direction is provided, so that while applying tension to the endless belt, the belt outer peripheral surface is pressed toward the pipe outer peripheral surface, and the endless belt is moved between the pair of rollers. The distance between the pair of rollers narrows against the urging force of the urging mechanism as it enters, and the pressing length of the belt outer peripheral surface against the outer peripheral surface of the tube in the belt rotation direction increases. The surface can be cut efficiently over a wide range in the pipe circumferential direction.

Embodiments of the present invention will be described below with reference to the drawings.
[First Embodiment]
1 to 9 show a polyethylene resin (an example of a thermoplastic resin) city gas supply pipe (hereinafter referred to as a new pipe) A, which is connected to the user's house U by heating by energization to connect the polyethylene resin connection target part. The connection part for the one end side of the new pipe A using the elbow pipe joint C and the saddle type branch pipe joint D provided with the polyethylene resin connection parts 4a, 4b, 5, 6 1 shows a pipe connection method in which 1 is branched and connected to a cylindrical city gas supply main branch pipe (hereinafter referred to as a buried pipe) B made of polyethylene resin buried under a road R.

  The pipe connection method includes an excavation process (FIG. 1) for excavating the pit 2 to expose the buried pipe B under the road R, a piping process (FIG. 2) for piping the new pipe A into the ground, and a new pipe A. Assembly process (FIG. 3) for assembling the elbow pipe joint C and the branch pipe joint D to the pipe, a first fusion process (FIGS. 4 and 5) for thermally fusing the branch pipe joint D to the buried pipe B, and an elbow pipe joint A second fusion process (FIGS. 6 and 7) in which C is thermally fused to the new pipe A and the branch pipe joint D is provided in this order.

  In the piping process, as shown in FIG. 2, the new pipe A is piped into the ground by the non-open cutting method across the pit 2 and the user's house U, and the connection part 1 at one end thereof is placed in the pit 2. While being exposed, the other end side is exposed to the ground side of the user's home U.

  In the assembling step, as shown in FIG. 3, the connecting portion 1 of the newly installed pipe A is pulled out to the ground side outside the pit 2, and as shown in FIG. Clamp jig that assembles the branch pipe joint D so as to be relatively rotatable around the pipe cores X1 and X2 of the connecting portion, and can maintain the assembled state and can be removed by remote operation from the ground side. As shown in FIG. 12, as shown in FIG. 12, the arcuate plate-shaped saddle portion 14, which is a connection portion of the branch pipe joint D to the buried pipe B, is remotely operated from the ground side. A pressing jig 32 is pressed on the branch pipe joint D.

  That is, the connection part 1 of the new pipe A is inserted into the one end side connection part 4b of the elbow pipe joint C, and the branch pipe part 5 of the branch pipe joint D is inserted into the other end side connection part 4a of the elbow pipe joint C. Assemble the new pipe A and elbow pipe joint C, and elbow pipe joint C and branch pipe joint D so that they can rotate relative to each other around the pipe axis X1 and X2 of the mutual connection part. At the same time, the pressing jig 32 is attached to the branch pipe joint D.

  As shown in FIG. 11, the clamp jig 3 includes a pair of clamp members 7 a and 7 b provided with two clamp portions 6 arranged in an L shape in plan view with a compression spring 12 interposed therebetween. The base member side is pivotably connected around the axis Y1 and supported on one clamp member 7b so as to be swingable about the axis Y2 substantially parallel to the axis Y1 of the clamp members 7a and 7b. The bolt 8 is protruded from a through hole formed in the other clamp member 7a and screwed into the nut member 9.

  Then, by tightening the nut member 9 to the bolt 8, the connection part 1 and the branch pipe part 5 of the new pipe A inserted through both ends of the elbow pipe joint C are clamped separately, and the elbow pipe joint C As shown in FIG. 11, it is impossible to rotate relative to the outer peripheral side of the nut member 9. By using the nut member operating rod 11 provided on one end side with the fitting portion 10 to be fitted to the nut member, by rotating the nut member operating rod 11 having the fitting portion 10 fitted to the nut member 9, the nut member 9 is loosened by remote control from the ground side, the clamp members 7a and 7b are separated by the urging force of the compression spring 12, and the clamp jig 3 is configured to be removable from the connection part 1 and the branch pipe part 5. is there.

  As shown in FIGS. 12 and 13, the pressing jig 32 has a fixed portion 33 that can be fixed to the branch pipe joint D and is remotely connected from the ground side by an operation rod 34 that is connected to the fixed portion 33. The saddle portion 14 can be applied to the outer peripheral surface of the pipe by remote operation from the ground side by an operation rod 34 which is provided so as to be unfixable by operation and is fixed to the branch pipe joint D by the fixing portion 33. A holding mechanism 35 that can hold the saddle portion 14 applied to the outer peripheral surface together with the buried pipe B from the pipe radial direction is provided to be switchable between a holding state and a non-holding state by remote operation from the ground side.

  The fixing portion 33 is composed of a male screw member that is screwed into the inner side of the drilling cylinder 36 provided in the branch pipe joint D, and the male screw member 33 is screwed into the inner side of the drilling cylinder 36 so as to press and cure. The tool 32 can be attached to the branch pipe joint D, and the operation rod 34 is fixed to the male screw member 33 in a concentric shape, and the male screw member 33 is rotated by the operation rod 34 and fixed to the branch pipe joint D. Is configured to be freely releasable.

  The sandwiching mechanism 35 includes a first U-shaped first sandwiching member 38 that is downwardly U-shaped in front view and can be pressed downward against the flanges 37 provided on both left and right edges along the longitudinal direction of the pipe of the saddle portion 14; The saddle portion 14 is configured to be clamped together with the buried pipe B from the radial direction with a pair of second holding members 39 that are U-shaped downward in a side view that can be locked from the left and right sides to the lower surface side of the buried pipe B. The operation rod 34 is inserted in a state in which the operation rod 34 is retained from the switching operation tool 40 that can be switched between a holding state and a non-holding state by remote operation from the ground side.

  The switching operation tool 40 is screwed into a first cylinder shaft member 41 connected to the first clamping member 38 so as to be relatively rotatable, and a first male screw portion 41 a formed on the first cylinder shaft member 41. A two-cylinder shaft member 42 and a cylindrical piece member 43 that is inserted through the second cylinder shaft member 42 so as to be relatively movable in the cylinder axis direction, and prevent the piece member 43 from coming out of the second cylinder shaft member 42. The nut 44 to be engaged is screwed into a second male screw portion 42a formed on the second cylinder shaft member 42, the operation rod 34 is inserted into the first cylinder shaft member 41, and the rotation operation portion 45 of the nut 44 is connected to one end side. The operation rod 34 can be inserted into the cylindrical operation tool 46 provided in the above.

  Each of the second clamping members 39 is supported in a vertically swingable manner by a pair of left and right support arms 47 that are fixed to the end portion on the first clamping member 38 side of the second cylinder shaft member 42 in the longitudinal direction. In addition, each of the upper end portions is connected to a pair of left and right swing arms 48 connected to the piece member 43 so as to be vertically swingable.

  Then, a compression spring (coil spring) 49 is mounted between the support arm 47 and the piece member 43 to urge the piece member 43 in the direction of coming out of the second cylindrical shaft member 42 and to resist the urging force of the nut 44. Then, by screwing into the second male screw portion 42 a, the lower end side of the second clamping member 39 swings in the direction approaching each other with the support arm 47 as a fulcrum, the nut 44 is loosened, and the biasing force of the compression spring 49 is used. By moving the piece member 43 upward, the lower end side of the second clamping member 39 swings in a direction away from each other with the support arm 47 as a fulcrum.

  Accordingly, by rotating the first tube shaft member 41, the relative position of the second tube shaft member 42 in the tube shaft direction with respect to the first tube shaft member 41 is changed, and the lower end of the first sandwiching member 38 and the second sandwiching member 38 are changed. The gap between the lower end of the member 39 is increased to an interval corresponding to the outer diameter of the buried pipe B, and the nut 44 is loosened to swing the holding mechanism 35 in a direction in which the lower end sides of the second holding member 39 are separated from each other. The pressing jig 32 switched to the non-clamping state is attached to the branch pipe joint D.

  In the first fusion process, as shown in FIG. 4, one of the pipe peripheral directions of the pipe outer peripheral surface of the buried pipe B is remotely operated from the ground side by using the grinding tool E according to the present invention. After thinning the range of the portion, that is, the range in which the arc-shaped fusion surface 22 of the saddle portion 14 which is the connection portion of the branch pipe joint D to the buried tube B is thinned, the new tube A is connected to the user's home U side. As shown in FIG. 5, the connecting portion 1 in which the elbow fitting C and the branch fitting D are assembled is drawn into the pit 2 and the saddle portion 14 is embedded by operating the operating rod 34. While being applied to the outer peripheral surface of the tube B, the operating rod 34 is passed through the cylindrical operating tool 46, and the nut 44 of the pressing jig 32 is tightened against the urging force from the ground side with the cylindrical operating tool 46. As a result, the lower end side of the second clamping member 39 is connected to the clamping mechanism 35 with each other. By switching the clamping state of being swung in a direction coming close to, keep pressing the saddle 14 to the tube outer peripheral surface of the buried pipe B.

  Next, the saddle portion 14 is thermally fused to the pipe outer peripheral surface of the buried pipe B by energizing the energization terminal 15 of the branch pipe joint D by remote operation from the ground side by the energizing operation tool 13.

  As shown in FIG. 14, the grinding tool E includes a housing 23 in which an electric motor and a reduction gear device are housed, an endless belt 25 having a belt outer peripheral surface 24 capable of grinding a pipe outer peripheral surface, and an endless belt. A support portion 26 that rotatably supports 25, a drive mechanism 27 that can drive and rotate the endless belt 25, and a cable 28 for energizing the electric motor are provided.

  The endless belt 25 is provided with an abrasive layer 29 on the outer peripheral surface thereof to constitute a belt outer peripheral surface 24 that can grind the outer peripheral surface of the pipe.

  The support portion 26 fixes arms 52 and 53 that rotatably support the driving roller 30 and the pair of left and right driven rollers 31 to the housing 23, and the inner peripheral side of the endless belt 25 is disposed on these rollers. 30 and 31 are wound around and supported so as to be rotatable.

  The drive mechanism 27 wraps a timing belt 56 over an output gear 54 fixed to the output shaft of the reduction gear device and an input gear 55 fixed to the drive roller 30, and decelerates by driving an electric motor. The endless belt 25 can be driven and rotated via a gear device.

  The pair of driven rollers 31 are provided so as to be adjacent to each other in the belt rotation direction. The pressing operation rod 57 is fixed to the housing 23, and the belt outer peripheral surface 24 is formed by remote operation from the ground side by the pressing operation rod 57. A pressing operation unit that can be pressed toward the outer peripheral surface of the pipe between the pair of rollers 31 is configured.

  As shown in FIG. 15, the energizing operation tool 13 can be electrically connected to each of a pair of energizing terminals 15 provided in the saddle portion 14 of the branch pipe joint D or the elbow pipe joint C. A pair of power supply sockets 16 are pushed and pulled by a cylindrical energization operation rod 17 connected to each socket 16 so as to be remotely controlled from the ground side with respect to each energization terminal 15. The power supply cable 19 connected to the terminal 18 of the socket 16 is inserted inside the energizing operation rod 17 and is connected to the energizing operation rod 17 and the socket 16. The connection release means 20 which can cancel | release connection with remote control from the ground side is provided.

  The connection release means 20 is provided with a connecting portion for screwing and connecting the energization operation rod 17 and the socket 16, and the energization operation rod 17 is moved forward and backward in a state where the socket 16 is attached to the energization terminal 15. By rotating the switch, the power supply operating rod 17 can be detached from the socket 16 or connected to the socket 16.

  Then, when the connecting portion 1 is pulled into the pit 2, the socket 16 connected to the energizing operation rod 17 is attached to each energizing terminal 15 of the branch pipe joint D, and the heat fusion is completed. After the energization is stopped, the socket 16 is pulled from the ground side by the energizing operation rod 17 to remove it from the energizing terminal 15, and after the fused portion is cooled, the nut 44 is loosened by the cylindrical operating tool 46 and clamped The mechanism 35 is switched to the non-clamping state, and the male screw member 33 is rotated by the operating rod 34 to release the fixing of the pressing jig 32 to the branch pipe joint D. The operating rod 34 moves the pressing jig 32 to the ground side. to recover.

  In the second fusion process, as shown in FIG. 6, the socket 16 connected to the energizing operation rod 17 by the operation from the ground side is attached to each energizing terminal 15 provided in the elbow fitting C. Thereafter, as shown in FIG. 7, the energizing operating rod 17 is rotated to remove it from the socket 16 and pull it up to the ground side before energizing to connect the connecting portions 4a and 4b of the elbow fitting C, the connecting portion 1 and the branch. When the heat fusion with the pipe joint D is completed, the energization is stopped and the fused portion is cooled, and then the energization operating rod 17 is connected to the socket 16 as shown in FIG. 17, the socket 16 is pulled from the ground side and removed from the energization terminal 15.

  Then, as shown in FIG. 8, the nut member 9 is loosened by the remote operation from the ground side with the nut member operating rod 11, and the clamp jig 3 is removed from the connection portion 1 and the branch pipe portion 5. 9 is pulled from the ground side, the clamp jig 3 is collected on the ground side, and the connection work between the new pipe A and the buried pipe B is completed as shown in FIG.

  After that, using a live pipe method or the like, a through hole is drilled in the pipe wall of the buried pipe B, and the new pipe A and the buried pipe B are connected to each other via the branch pipe joint D and the elbow pipe joint C. , Backfill pit 2.

[Second Embodiment]
FIG. 16 shows another embodiment of the grinding tool E according to the present invention, in which each of the intermediate positions in the longitudinal direction of the pair of arms 53 is oscillated around the oscillating axis Z along the belt rotating direction. A pair of driven rollers is supported while the driven roller 31 is rotatably supported on one end side of these arms 53, and the other end side is connected to the housing 23 by a tension spring 58 to apply tension to the endless belt 25. An urging mechanism 59 for urging in the direction in which the interval between 31 is opened is provided.
Other configurations are the same as those of the first embodiment.

[Other Embodiments]
1. In the tool according to the present invention, one of the pair of rollers wound around the inner peripheral side of the endless belt may be constituted by a drive roller.
2. The tool according to the present invention may be used for cutting the outer peripheral surface of a metal tube.
3. The tool according to the present invention may be used for cutting the outer peripheral surface of the pipe without remote control. 4). The tool according to the present invention may be used to cut the outer peripheral surface of a pipe in piping work for supplying gas other than city gas or for supplying liquid such as water.

Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method Illustration of pipe connection method (B) Plan view of relevant parts, (b) Perspective view of relevant parts (B) Perspective view of relevant parts, (b) Partial sectional view of relevant parts Partial cross-sectional front view of pressing jig Side view of pressing jig Side view of grinding tool Longitudinal sectional view of the power tool Side view of the grinding tool of the second embodiment

Explanation of symbols

24 belt outer peripheral surface 25 endless belt 26 support portion 27 drive mechanism 31 pair of rollers 57 pressing operation portion 59 biasing mechanism B pipe

Claims (2)

A tool used to cut the outer peripheral surface of a pipe,
An endless belt provided with a belt outer peripheral surface capable of grinding a pipe outer peripheral surface, a support portion for rotatably supporting the endless belt, and a drive mechanism capable of driving and rotating the endless belt;
A pair of rollers wound around the inner peripheral side of the endless belt are provided adjacent to each other in the belt rotation direction, and the belt outer peripheral surface is pressed between the pair of rollers toward the tube outer peripheral surface. A tool with an operation unit.   The tool according to claim 1, further comprising an urging mechanism that urges the pair of rollers in an opening direction.

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