JP2006334707A - Cutter for cutting resin joint, method for cutting resin joint, and method for removing resin branch pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutter for cutting a resin joint capable of cutting the resin joint (service T) so that a cutting surface of the joint may be flat and smooth. <P>SOLUTION: This cutter 1 for cutting is provided with a base part 10 fixed to the service T 115 and a cutting part 50 mounted on the base part 10 to cut the vicinity of the root of a riser part 117. When a feed screw 57 of the cutting part 50 is screwed, a cutter blade 73 hits on the vicinity of the root of the riser part 117 to push and cut the vicinity. Since the base part 10 can be used in a state fixed to a saddle part 116 in the cutter 1, the cutter blade 73 of the cutting part 50 mounted on the base part 10 is stably advanced and retreated. As a result, the resin joint can be cut so that the cutting surface of the riser part 117 may be flat and smooth, as compared with a case where a cutting work is manually performed by using a saw, etc. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cutter for cutting a resin joint (service chi) such as a gas pipe, a method for cutting a resin joint using such a cutter, and a method for removing a resin branch pipe.

The background art will be explained taking the field of city gas piping as an example.
In recent years, resin pipes such as polyethylene pipes have been frequently used for city gas pipes. This is because resin pipes are more resistant to corrosion and earthquake than conventional plated steel pipes and are excellent in workability of piping work. In such a resin pipe, when connecting a resin branch pipe to an existing pipe, an electric fusion joint is generally used.

FIG. 22 is a partial cross-sectional side view showing an example of a resin pipe using a Qi-type electrofusion joint.
In FIG. 22, a resin main pipe 201 extending in the front and back direction of the figure and a resin branch pipe 203 extending in the right direction of the figure are connected via an electric fusion joint (service team) 205. It is shown. The service chi 205 is made of a thermoplastic such as polyethylene. The service chi 205 includes a cylindrical rising pipe portion 205a, a saddle-like saddle portion 205b integrated with a lower end of the rising pipe portion 205a, and a branching portion 205c branched laterally from a side surface of the rising pipe portion 205a. Is provided.

  A built-in tapping tool (drilling cutter) 206 is accommodated in the rising pipe portion 205 a of the service chi 205. The perforating cutter 206 is for opening a tapping hole 201 a in the side wall of the main pipe 201 after the service team 205 is fused to the main pipe 201. The tapping hole 201a opened by the punching cutter 206 passes through the side wall of the main pipe 201 and the saddle portion 205b of the service team 205, and serves as a communication hole between the inside of the main pipe 201 and the inside of the branch pipe 203. A heating wire (not shown) is embedded in the saddle portion 205 b of the service chi 205. A current is passed through the heating wire to generate heat, and the saddle portion 205b is hermetically fused to the side surface of the main tube 201. A branch pipe 203 is connected to the branch portion 205 c of the service team 205 via a socket 207. The socket 207 is fixed while sealing the connecting end portions of the branch portion 205 c of the service team 205 and the branch pipe 203.

By the way, in such a resin pipe, when removing a branch pipe that has become unnecessary due to removal of a building or the like, the existing branch pipe 203 is conventionally removed by the procedures (1) to (3) described below. Yes.
23 to 25 are partial cross-sectional side views showing an outline of a conventional method for removing a resin branch pipe.
(1) As shown in FIG. 23, the middle of the branch pipe 203 is sandwiched between squeeze bars 210 and is compressed and cut off (squeezed off). At this time, the position 203x where the branch pipe 203 is squeezed off is from the end of the socket 207 (the right end in the figure) to the outer diameter D of the branch pipe 203 so that the socket fused portion is not adversely affected by compression. It is necessary to set the position at a distance of three times or more. By performing this squeeze-off, the gas flow inside the branch pipe 203 is shut off.

(2) As shown in FIG. 24, the tip of the branch pipe 203 (the right end side in the figure: the side opposite to the main pipe 201) 203z is cut with a saw or the like, and then a cap 211 is attached to the cut end 203y of the branch pipe 203. Install. At this time, the branch pipe 203 is cut at a position (cut end 203y) separated from the squeeze-off position 203x by at least three times the branch pipe outer diameter D. This is to prevent the socket fused portion from being adversely affected by compression, as in the case of (1). After the cutting operation of the branch pipe 203 is completed, the tip 203 ′ of the cut branch pipe 203 is removed.
(3) As shown in FIG. 25, the squeeze bar 210 squeezing off the remaining portion 203 ″ of the branch pipe 203 is opened. When the squeeze off is opened, the resin branch pipe 203 is elastically deformed, and the original Since the gas flowing from the main pipe 201 to the branch pipe 203 side is blocked by the cap 211, the gas does not leak even after the branch pipe 203 is cut.

  By the way, in the conventional method for removing the resin branch pipe, the squeeze-off of the branch pipe 203 must be performed at a position 203x away from the right end portion of the socket 207 by about three times or more the outer diameter D of the branch pipe. Further, the cutting of the branch pipe 203 must be performed at a position 203y that is separated from the squeeze-off position 203x by about three times or more the outer diameter D of the branch pipe. Therefore, the cutting position 203y is a position separated by at least about 6 times or more of the outer diameter D of the branch pipe when measured from the root portion of the main pipe 201. For this reason, even after the removal work is completed, a part 203 ″ (remaining part) of the branch pipe remains considerably long (see FIG. 25).

  The remaining portion 203 ″ of the branch pipe 203 is buried in the ground again after the removal work is completed. If the remaining portion 203 ″ remains in the ground, other parts such as excavation work will be passed after a certain period of time after the removal work. When performing the construction, there is a possibility that the excavation tool or the like may hit the remaining portion 203 ″. Since the remaining portion 203 ″ of the branch pipe 203 is made of resin, it is easily damaged when hit by the excavation tool or the like, and gas leaks from the damaged portion. There is a risk that this will occur. Therefore, when cutting and removing the branch pipe, it is required to make the branch pipe remaining portion as short as possible.

On the other hand, the present applicant, in Patent Document 1 (Japanese Patent Laid-Open No. 2002-295724), can reduce the risk of damaging the remaining branch pipe in another construction after removing the branch pipe. Proposed method of removing branch pipes ”. This is to perform the operations of the first to fourth stages described below, and remove a part of the service team fused to the main pipe and the branch pipe connected thereto.
First stage: Insert a perforating cutter built in the rise pipe section of the service team into a hole (tapping hole) on the side wall of the main pipe.
Second stage: After cutting the root of the rising portion of the service chi above the perforating cutter, the branch tube is removed together with the rising tube portion. Here, in order to cut the root of the service chi connected to the main pipe and remove the entire branch pipe, there is no branch pipe left after the removal work, and the remaining pipes in other work after removing the branch pipe Can reduce the risk of damage.

Third stage: A no-blow gas bag (sealing work bag) is attached to the cutting portion of the service chi, and a punching cutter is removed from the inside of the main tube side wall inside the bag, and then a temporary stopper is attached to this hole. Here, since the perforating cutter is removed inside the no-blow gas bag and the temporary stopper is attached, it is possible to prevent gas leakage during these operations.
Fourth stage: Rotating the resin main stopper from the outside of the temporary stopper while rotating it, and the heat is generated between the main stopper and the hole end, and the main stopper is fused to the cutting part of the service team. .

JP 2002-295724 A

By the way, it is required to perform the removal operation of the resin branch pipe as described above more smoothly to simplify the operation and reduce the cost.
This invention is made | formed in view of such a subject, Comprising: It provides the cutter for resin joint cutting | disconnection which can cut so that the cut surface of a resin joint (service chi) may be flat and smooth. Objective.
It is another object of the present invention to provide a resin joint cutting method capable of smoothly cutting a rising pipe portion of a resin joint using a resin joint cutting cutter.
It is another object of the present invention to provide a method for removing a resin branch pipe that can realize further simplification and cost reduction of the branch pipe removal work and can increase work variations.

  The cutter for cutting a plastic joint according to the present invention cuts the rising pipe portion of the plastic joint comprising: a saddle portion that is applied to the outer surface of the main pipe and is fused; and a rising pipe portion that rises from the saddle portion. A cutter that has a base fixed to the saddle portion, a tool post having a cutter blade pressed against the riser portion, and attached to the base that advances and retracts the tool post. And a cutting part having a feed mechanism.

  When using this cutter, fix the base to the saddle part of the resin joint fused to the main pipe, and operate the feed mechanism to advance the tool post toward the riser pipe part. After the cutter blade hits the rising pipe portion, it is pushed out and the rising pipe portion is separated from the saddle portion. After cutting the riser section, the feed mechanism can be operated to return the tool post and the cutter blade to the position before cutting again. According to this cutter, since the base portion can be used in a state of being fixed to the saddle portion, the tool post and the cutter blade that are advanced and retracted by the feeding mechanism attached to the base portion operate stably. Therefore, the cutting surface can be cut so as to be flat and smooth as compared with a case where a cutting operation is performed manually using a saw or the like.

In the resin joint cutting cutter of the present invention, the cutting portion can be detachable from the base portion.
In this case, first, the base portion can be fixed to the saddle portion of the resin joint, and then the cutting portion feeding mechanism can be attached to the base portion. Since the cutting portion may be attached immediately before cutting the rising pipe portion, the cutting portion does not get in the way when the base portion is fixed to the saddle portion and when the base portion is removed from the saddle portion. Therefore, it becomes easy to perform the work of attaching the cutter to the resin joint.

In the resin joint cutting cutter according to the present invention, the base portion engages with the upper surface of the saddle portion, and the attachment portion provided on the engagement portion to which the feed mechanism of the cutting portion is attached. And a guide bar provided in the engaging portion and extending on both sides in the width direction (radial direction of the main pipe) of the saddle portion, and the saddle portion slidably attached to each of these guide bars A slide member disposed on both sides of the saddle member, and a detachable fixing portion provided on each of the slide members and detachably fixed to both end edges in the width direction of the saddle portion. .
In this case, at the time of attaching the base portion to the resin joint, the engaging portion is engaged with the upper surface of the saddle portion (the engaging protrusion formed on the upper surface), and the attachment / detachment fixing portion of each slide member is connected to both edges of the saddle portion. It fixes to (the engagement protrusion formed in this both-ends edge). Here, when attaching the base part to a wide saddle part (for a main pipe having a large diameter), slide each slide member along the guide bar so as to be separated from each other, and then fix between the two attachment / detachment fixing parts. Can do. Conversely, when attaching the base to a narrow saddle (for a main pipe with a small diameter), slide each slide member along the guide bar so that they are close to each other, and then fix between the two attachment / detachment fixing parts. Can do. As described above, by sliding the slide member along the guide bar, it is possible to realize variable mounting performance with respect to saddle portions having different widths.

In the resin joint cutting cutter according to the present invention, the feed mechanism includes a frame having a pair of guide rods disposed on both sides of the saddle portion in the width direction (the radial direction of the main tube) with the rising pipe portion interposed therebetween. A movable tool rest that is movably attached to the guide rod and to which the cutter blade is fixed, and a feed screw attached to the frame that moves the movable tool rest along the guide rod. It can be provided.
In this case, it is possible to push the rising pipe portion with the cutter blade while operating the feed screw to move the movable tool rest along the guide rod. Such a feed mechanism is advantageous in that the structure is not complicated and the manufacturing cost is low.

In the resin joint cutting cutter according to the present invention, the frame of the feed mechanism may be provided with an abutting portion to which a hand is applied when the feed screw is operated.
In this case, when operating the feed mechanism by manually turning the feed screw, if the work is performed with one hand on the contact portion, it is easy to put a screw turning force (moment force), and the screw feed operability is improved. In addition, when the cutting part and the base are detachable and the cutting part is simply put on and locked to the upper side of the base, the cutting at the time of screw feeding can be done by placing one hand on the contacting part. The rising of the part can be suppressed, and the riser part can be cut reliably.

In the resin joint cutting cutter of the present invention, the frame of the feed mechanism is a frame member that spans between one end portions of the pair of guide rods and that can swing with one of the pair of guide rods as a fulcrum. And the frame member can be attached to and detached from the attachment portion of the base portion.
In this case, after fixing the base portion to the resin joint, when attaching the feed mechanism of the cutting portion, the frame member can be swung to open the space between both guide rods and inserted from the side of the riser tube portion. After the insertion, the frame member is swung again to close the space between the two guide rods, and the frame member is attached to the attachment portion of the base portion, whereby the attachment of the cutting portion to the base portion is completed.

In the resin joint cutting method of the present invention, the rising pipe portion of the resin fitting including the saddle portion that is applied to the outer surface of the main pipe and is fused, and the rising pipe portion that rises from the saddle portion is made of resin. It is a method of cutting with a cutter for joint cutting, wherein the cutter has a base fixed to the saddle part, a tool post having a cutter blade pressed against the riser part, and advancing and retreating the tool post. A cutting part having a feed mechanism attached to the base part, the base part being fixed to the saddle part, the tool post being fed toward the rising pipe part by the feed mechanism of the cutting part, and the cutter The blade is pressed against the riser portion and cut.
According to this cutting method, the rising pipe portion of the resin joint can be smoothly cut using the resin joint cutting cutter. Thereby, cost reduction of cutting work is realizable.

  The method for removing a resin branch pipe according to the present invention is a method for removing a resin branch pipe connected to a main pipe via a service chi, wherein the service chi has a through hole communicating with the main pipe. A saddle part, a rising pipe part rising from the periphery of the through hole of the saddle part, a branch part branching out and extending from the rising pipe part, and a cheek cap detachably provided at an upper end of the rising pipe part A drilling cutter built in the pipe of the rising pipe part and capable of being inserted through the through hole of the saddle part, and the saddle part is applied to the outer surface of the main pipe and fused. The branch portion is connected to the resin branch pipe via a joint, and the cheek cap is removed from the rise pipe portion of the service chi, and the work for sealing the cheek cap attachment portion of the rise pipe portion is sealed. for A temporary plug is inserted into the riser pipe portion toward the main pipe side inside the sealing work tool, and the gap between the main pipe side and the riser pipe part is sealed, and the temporary plug The base portion of the rising pipe portion of the service chi is cut by the resin joint cutting method according to claim 7, and a main plug is attached to an end portion of the cut rising pipe portion. To do.

  In the method disclosed in Patent Document 1 (Japanese Patent Application Laid-Open No. 2002-295724), after inserting a perforated cutter (a cutter built in the rising pipe part) into the main pipe side, the Qi is cut, and this cutting part is The temporary stopper is attached after the sealing work bag is attached. In this method, since the temporary stopper is inserted after the sealing work tool is attached, the work process becomes smoother. Further, by cutting the service chi near the root of the rising pipe portion, it is possible to completely remove the laterally pulling remaining portion including the branch pipe, the joint, and the branch portion of the service chi. Furthermore, at the time of a cutting operation, the rising pipe portion can be smoothly pushed out by using the resin joint cutting cutter according to the present invention.

In the method for removing a resin branch pipe according to the present invention, the main plug can be attached to the cut portion of the rising pipe portion by butt fusion.
In addition, the main plug can be attached to the cutting portion of the riser portion by electric fusion.
Further, the main plug can be applied to the cutting portion of the riser pipe while rotating, and can be fused by frictional heat generated between them.
By appropriately selecting and using these fusion methods, it is possible to increase work variations according to work conditions and the like.

  ADVANTAGE OF THE INVENTION According to this invention, the cutter for resin joint cutting etc. which can cut so that the cut surface of a resin joint (service team) may be flat and smooth can be provided.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, it demonstrates, referring drawings. In the present embodiment, a case of a service chi disconnection of city gas piping will be described.
FIG. 1 is a side view showing a cutting cutter according to the present embodiment, showing a state where the cutting cutter is attached to a service team fused to a main pipe.
FIG. 2 is a view showing the cutting cutter, and is a plan view (viewed from the upper side of FIG. 1) showing an attachment state to the service chi fused to the main pipe.
FIG. 3 is a view showing the cutting cutter, and is a front view (viewed from the right side of FIG. 1) showing a state of attachment to the service chi fused to the main pipe.
FIG. 4 is a perspective view showing a state where the base and the cutting part of the cutting cutter are separated and a service chi.

  In the following description of the cutting cutter, unless otherwise specified, front / rear / up / down / left / right refers to the directions of the arrows shown in FIGS. The front-rear direction is the longitudinal direction of the main tube, the up-down direction is a vertical direction orthogonal to the front-rear direction, and the left-right direction is a horizontal direction orthogonal to the front-rear direction.

First, the service chi (resin joint) in this Embodiment is demonstrated.
As shown most clearly in FIG. 4, the service chi 115 in the present embodiment is fused to the outer surface of the main pipe 111. The service chi 115 is made of a thermoplastic such as polyethylene. The service chi 115 includes a saddle portion 116 that is fused to the outer peripheral surface of the main tube 111. Two locking projections 116 a are formed on the upper surface of the saddle portion 116. In addition, two locking projections 116b and 116c are formed on the left and right side edges of the saddle portion 116, respectively. The locking projections 116a to 116c are engaged with the cutting cutter 1 according to the present invention, the band 181 (see FIG. 17 to be described later) used when the plug is fused, and the like.

  A heating wire (not shown) is embedded in the inner surface of the saddle portion 116 (the surface that contacts the main tube 111). Current is passed through the heating wire to generate heat, and the saddle portion 116 is hermetically fused to the outer peripheral surface of the main tube 111. On the saddle portion 116, a rising pipe portion 117 is formed to rise. A male screw 117 c is formed at the upper end of the rising pipe portion 117. A cheek cap 118 (see FIGS. 8 and 9 to be described later) and a bag fixing jig 133 (see FIG. 10 to be described later) for fixing the no blow gas bag 131 are detachably attached to the male screw 117c. On the outer side of the riser pipe 117 below the male screw 117c, two ridges 117a projecting like a bowl are formed. A branching portion 119 branches off from the side of the rising pipe portion 117 and extends. A branch pipe 113 is connected and fixed to the branch portion 119 via an electric fusion socket 123 (see FIGS. 9 to 13 described later).

Hereinafter, the cutting cutter 1 which concerns on this invention is demonstrated.
The cutting cutter 1 shown in FIGS. 1 to 4 is attached to the service chi 115 and cuts the vicinity of the root of the rising pipe portion 117. The cutting cutter 1 is roughly provided with a base 10 and a cutting part 50. As shown in FIG. 4, the base 10 and the cutting part 50 are detachable.

First, the base 10 will be described in detail.
The base 10 includes a square block 11. As shown in FIG. 1, an engagement protrusion 11 a is formed on the lower end surface of the block 11. The engagement protrusion 11 a fits between the engagement protrusions 116 a on the upper surface of the saddle portion 116 of the service team 115. As shown in FIGS. 2 to 4, two guide bars 12 (12 </ b> A, 12 </ b> B) and 13 (13 </ b> A, 13 </ b> B) extend from the left and right side surfaces of the block 11. The guide bars 12A and 12B, 13A and 13B are arranged in parallel, and the guide bars 12A and 13A, and 12B and 13B are arranged on the same axis. Large diameter heads 12 'and 13' are formed at the ends of the guide bars 12A, 12B, 13A and 13B.

  As clearly shown in FIG. 4, trapezoidal slide plates 15 and 16 are attached to the guide bars 12 and 13 on the left and right sides of the block 11, respectively. Slide slides 15A, 15B, 16A, and 16B with flanges are screwed to the slide plates 15 and 16, respectively. The slide sleeves 15A, 15B, 16A, and 16B are slidably fitted on the guide bars 12A, 12B, 13A, and 13B, respectively. The slide plates 15 and 16 slide while being stably supported by the two guide bars 12A and 12B and 13A and 13B through the slide sleeves 15A and 15B and 16A and 16B, respectively. The slide plates 15 and 16 abut against the heads 12 'and 13' formed at the ends of the guide bars 12A, 12B, 13A and 13B and are prevented from coming off.

  As clearly shown in FIG. 4, a band plate-like attachment portion 21 is screwed to the front surface of the block 11. A notch portion 21 a is formed at the lower end of the attachment portion 21. When the base 10 is attached to the service chi 115, the upper surface of the saddle portion 116 hits the inside of the notch 21a. At both left and right end portions of the attachment portion 21, projecting step portions 23 projecting forward are integrally formed. Further, an end face plate 25 is fixed to the end face of each protruding step 23 by screws. An engaging groove 26 extending vertically is formed between the protruding step portion 23 and the end face plate 25. As shown in FIG. 2, these engagement grooves 26 are opposed to each other, and both end edges 51a of an engagement member 51 of a cutting portion 50 to be described later are inserted. In the present embodiment, an attachment / detachment structure between the base portion 10 and the cutting portion 50 is realized by the engagement groove 26 of the attachment portion 21 and both end edges 51 a of the engagement member 51.

  As clearly shown in FIG. 4, attachment / detachment fixing portions 31 and 32 are provided at the front lower end portions of the slide plates 15 and 16, respectively. The detachable fixing portion 31 (32) is connected to the upper plate 33 (34) fixed to the lower end on the front side of the slide plate 15 (16), and is connected to the upper plate 33 (34) via a bolt 35 (36). A lower plate 37 (38) is provided. In the bolt 35 (36), the upper plate 33 (34) passes therethrough and is screwed to the lower plate 37 (38). As shown in FIGS. 1 and 3, when the base 10 is attached to the service chi 115, a saddle portion is provided between the upper plate 33 (34) and the lower plate 37 (38) of the attachment / detachment fixing portion 31 (32). The engagement protrusion 116b (116c) of 116 is clamped, and the bolt 35 (36) is disposed between the engagement protrusions 116b (116c).

Next, the cutting unit 50 will be described in detail.
As clearly shown in FIG. 4, the cutting portion 50 includes an engaging member 51 and a screw support member 55 facing each other, and a pair of parallel guide rods 61 and 62 provided between the both members 51 and 55. Have. In the present embodiment, the engaging member 51, the screw support member 55, and both guide rods 61 and 62 are assembled in a frame shape, and a frame of the feed mechanism is configured.

  Both end edges 51a of the engaging member 51 can be engaged with the engaging groove 26 of the mounting portion 21 of the base portion 10 as described above (see FIG. 2). As shown in FIG. 4, the engagement member 51 is inserted with an engagement recess 52 to which an end of one (left side) guide rod 61 is engaged, and an end of the other (right side) guide rod 62. Through-holes 53 are formed. The engagement member 51 can swing upward on the engagement recess 52 side with the through hole 53 (guide rod 62) as a fulcrum. With this swing structure, after fixing the base portion 10 to the service chi 115, when attaching the cutting portion 50, both guide rods 61 and 62 are opened and inserted from the side of the riser portion 117, and the engaging member 51 is inserted into the base portion. 10 engaging grooves 26 (details will be described later).

  A female screw plate 56 is screwed to the outer surface (front surface) of the central portion of the screw support member 55. The feed screw 57 is screwed so as to be able to advance and retreat through the central portion of the screw support member 55 and the female screw plate 56. A tool engaging head 57 a for engaging a tool (not shown) such as a wrench is formed at the protruding end (front end) of the feed screw 57. On the other hand, a connecting end (rear end) 57b of the feed screw 57 is rotatably connected to a feed plate 75 described later. Further, a gripping rod (abutting portion) 59 is raised and fixed to the screw support member 55. The gripping bar 59 is a member for placing a hand during the screw feeding operation of the feed screw 57 (details will be described later).

  Moving blocks 71 and 72 are slidably fitted to the guide rods 61 and 62, respectively. A cutter blade 73 is held between the two moving blocks 71 and 72. Further, a feed plate 75 is slidably fitted between the guide rods 61 and 62. The feed plate 75 and the moving blocks 71 and 72 are integrally connected by connecting plates 76 and 77, respectively. Yes. In the present embodiment, the moving turret is constituted by the moving blocks 71 and 72, and the turret holding the cutter blade 73 is constituted by the both moving blocks 71 and 72, the feed plate 75, and the connecting plates 76 and 77.

  As shown in FIG. 2, a hole 75a is formed in the front end surface of the central portion of the feed plate 75, and the connecting end 57b of the feed screw 57 is inserted into the hole 75a. A circumferential groove 57c is cut in the vicinity of the connecting end 57b of the feed screw 57, and a pin 78 is inserted into the circumferential groove 57c. The pin 78 passes through the upper surface of the feed plate 75 and reaches the hole 75a, and is disposed in the circumferential groove 57c of the connecting end 57b of the feed screw 57 in the hole 75a. The feed plate 75 and the feed screw 57 are connected by the pin 78, and the feed plate 75 moves along the guide rods 61 and 62 as the feed screw 57 rotates.

Here, a method of using the cutting cutter 1 having the above-described configuration (a method of cutting the rising pipe portion 117 of the service team 115) will be described.
FIG. 5 is a view showing the cutting cutter, and is a plan view showing a state in which the cutter blade of the cutting portion has been advanced from the state of FIG. 2.
FIG. 6 is a view showing the cutting cutter, and is a plan view showing a state in which the rising edge of the service chi is cut by further advancing the cutter blade of the cutting portion from the state of FIG. 5.
FIG. 7 is a view showing the cutting cutter, and is a plan view showing a state where the cutter is attached to a saddle portion having a large width (a main pipe having a large diameter).

  First, as shown in FIGS. 1 to 3, the base 10 of the cutting cutter 1 is attached to the service chi 115 fused to the outer surface of the main pipe 111. When the base portion 10 is attached, the engagement protrusion 11a on the lower end surface of the block 11 is fitted between the engagement protrusions 116a of the saddle portion 116 of the service team 115 (see FIG. 1). Then, the slide plates 15 and 16 are slid along the guide bars 12 and 13, the attachment / detachment fixing portions 31 and 32 are brought close to the engagement protrusions 116 b and 116 c at both ends of the saddle portion 116, and the bolt 35 (36) is attached. The engaging protrusion 116b (116c) is sandwiched between the upper plate 33 (34) and the lower plate 37 (38) by being disposed between the engaging protrusions 116b (116c) (see FIGS. 1 and 3). Thereafter, when the bolt 35 (36) is tightened, the lower plate 37 (38) moves upward, and the engagement protrusion 116b (116c) is fixed between the upper plate 33 (34) and the lower plate 37 (38). (See FIGS. 1 and 3).

  As shown in FIG. 7, when the base 10 is attached to a wide saddle portion (see symbol T in the figure), the slide plates 15 and 16 are slid along the guide bars 12 and 13 so as to be separated from each other. Then, after the space between both attachment / detachment fixing portions 31 and 32 is widened (see symbol L in the figure), fixing is performed in the same manner as described above. In this way, the slide plates 15 and 16 can be slid along the guide bars 12 and 13 so that the space between the attachment and detachment fixing portions 31 and 32 can be varied. Even the base 10 can be attached.

  After attaching the base 10 to the service chi 115, as shown in FIG. 2, both end edges 51 a of the engaging member 51 of the cutting part 50 are inserted and attached to the engaging grooves 26 of the attaching part 21 of the base 10. At this time, the cutting part 50 swings and lifts the engaging member 51, opens between both guide rods 61 and 62, and inserts from the side of the rising pipe part 117 (right side in FIG. 2). Then, after arranging the guide rods 61 and 62 on both sides of the rising pipe portion 117, the engaging member 51 is swung down to engage both end edges 51 a of the engaging member 51 with the engaging groove 26 of the base 10. To do. Due to the swing structure of the engaging member 51, for example, the branch portion 119 of the service team 115 extends to the front side (the right side in FIG. 2), and the socket 119 is connected to the branch portion 119 as shown in FIGS. Even when the branch pipe is connected through the cutting pipe 50, the cutting section 50 can be inserted from the side of the rising pipe section 117 and attached to the base 10.

  In the present embodiment, the base portion 10 and the cutting portion 50 of the cutting cutter 1 are configured separately, and the cutting portion 50 may be attached immediately before cutting the rising pipe portion 117, so that the saddle portion 116 is attached to the cutting portion 50. When the base 10 is fixed and when the base 10 is removed from the saddle portion 116, the cutting portion 50 does not get in the way. Therefore, it is easy to attach the cutting cutter 1 to the service chi 115. As shown in FIG. 2, when the cutting portion 50 is attached to the base portion 10, the screw support is provided so that the rising pipe portion 117 of the service chi 115 is disposed between the engaging member 51 and the cutter blade 73. The feed screw 57 is rotated until the member 55 and the feed plate 75 are almost in contact with each other. At this time, the cutter blade 73 is disposed on the same horizontal plane as the vicinity of the root of the rising pipe portion 117.

  After the cutting cutter 1 is attached to the service chi 115 as described above, a tool (not shown) such as a wrench is engaged and screwed into the tool engaging head 57a of the feed screw 57. At this time, if the feed screw 57 is turned while manually grasping the gripping rod 59, a force (moment force) can be easily applied, and the screw feed operability is improved. As the feed screw 57 is gradually screwed in, the feed plate 75 connected to the feed screw 57 is pushed toward the rising pipe portion 117 and slides along the guide rods 61 and 62. At the same time as the feed plate 75 slides, the moving blocks 71 and 72 connected to the feed plate 75 via the connection plates 76 and 77 slide along the guide rods 61 and 62, and the cutter blade 73 approaches the rising pipe portion 117. (FIG. 2 → FIG. 5). When the feed screw 57 is further screwed in, the cutter blade 73 hits the vicinity of the root of the rising pipe portion 117 and pushes it out (FIG. 5 → FIG. 6).

  As described above, after the riser pipe portion 117 is pushed by the cutter blade 73 and separated from the saddle portion 116, the feed screw 57 can be turned in the opposite direction to return to the state shown in FIG. According to this cutting cutter 1, since it can be used in the state where base 10 was fixed to saddle part 116, cutter blade 73 of cutting part 50 attached to this base 10 advances and retreats stably. Therefore, the cutting surface of the rising pipe portion 117 can be cut so as to be flat and smooth as compared with a case where cutting work is performed manually using a saw or the like.

Hereinafter, a method for removing the resin branch pipe according to the present invention will be described.
FIG. 8 is a partial cross-sectional side view showing a state before removal in the method for removing a resin branch pipe according to the present invention.
FIG. 9 is a partial cross-sectional side view showing a state where the cheek cap is removed in the resin branch pipe removing method.
FIG. 10: is a partial cross section side view which shows the sealing work bag attachment state in the removal method of the resin branch pipe.
FIG. 11: is a partial cross section side view which shows the cutter removal and temporary stopper attachment operation | work in the sealing operation | work bag in the removal method of the resin branch pipe.
FIG. 12: is front sectional drawing which shows the cutter raising state in the removal method of the resin branch pipe.
FIG. 13: is front sectional drawing which shows the temporary stopper attachment state in the removal method of the resin branch pipe.
FIG. 14: is a partial cross section side view which shows the cutting | disconnection state of the riser pipe part in the removal method of the resin branch pipe.

  In the resin pipe shown in FIG. 8, the main pipe 111 and the branch pipe 113 are connected via the service team 115 similar to the above. The saddle portion 116 is hermetically fused to the outer peripheral surface of the main tube 111. A chee cap 118 is detachably screwed to the upper end of the rising pipe portion 117. A branch pipe 113 is hermetically connected and fixed to the branch part 119 branched and extended from the side of the rising pipe part 117 via an electric fusion socket 123. A punching cutter 121 is built in the rising pipe portion 117 of the service chi 115. As shown in FIG. 12, the male screw 121 b on the outer peripheral surface of the punching cutter 121 is engaged with the female screw 117 b on the inner peripheral surface of the rising pipe portion 117 of the service chi 115. The perforating cutter 121 is for opening the through hole 111 a in the side wall of the main pipe 111 after the saddle portion 116 is fused to the outer surface of the main pipe 111. The through-hole 111a opened by the punch cutter 121 serves as a communication hole between the inside of the main pipe 111 and the inside of the service team 115 (and the branch pipe 113). Inside the blade 121c at the lower end of the perforating cutter 121, a section 111 'when the through hole 111a is formed in the main tube 111 is held.

  In the removal method in the present embodiment, first, the periphery of the pipe buried in the ground is excavated and exposed, and as shown in FIG. Remove from 117. Then, as shown in FIG. 10, the no blow gas bag 131 is attached to the upper end of the rising pipe portion 117 of the service team 115 using the bag fixing jig 133. The no-blow gas bag 131 is a transparent resin bag-like body, and has two upper and lower openings. A periphery of the upper opening is a throttle port 131a to which rubber or the like is attached, and is extendable. A protective plate 131b made of rubber or the like is attached around the lower opening. The bag fixing jig 133 has a ring shape, and a female screw 133a that is screwed into the male screw 117c (attachment screw of the cheek cap 118) of the rising pipe portion 117 is cut on the inner surface.

  To attach the no-blowing gas bag 131, first, the lower opening (protective plate 131b side) is passed through the upper end of the rising pipe portion 117 of the service team 115 and lowered to the flange portion 117a. Next, the bag fixing jig 133 is inserted from the upper opening 131 a of the no blow gas bag 131. Then, when the bag fixing jig 133 is fastened to the male screw 117c of the riser pipe portion 117, the gap between the jig 133 and the flange portion 117a is hermetically sealed by the protective plate 131b, and the no blow gas bag 131 is fixed.

  Next, as shown in FIG. 11, a hand H is inserted through the throttle port 131 a of the no-blow gas bag 131 and the punching cutter 121 is removed. At this time, as shown in FIG. 12, a tool such as a hexagon wrench fly 100 is inserted from the opening end portion of the rising pipe portion 117 and engaged with the engagement hole 121 a of the punch cutter 121. Then, when the hexagon wrench fly 100 is turned, the male screw 121b of the punch cutter 121 rises along the female screw 117b on the inner peripheral surface of the rising pipe portion 117 of the service chi 115.

  After removing the perforating cutter 121 in this way, the temporary stopper 135 is pushed into the rising pipe portion 117. As shown in FIG. 13, the temporary stopper 135 is made of rubber or the like and has flexibility. Therefore, it can be pushed against the thread of the female thread 117b on the inner peripheral surface of the rising pipe portion 117 by using a tool such as the push bar 102. The temporary plug 135 seals between the inside of the main pipe 111 and the inside of the branch portion 119 (and the branch pipe 113) of the service team 115. In this way, by working with the no-blow gas bag 131, the inside of the through-hole 111a is not exposed to the outside when removing the perforating cutter 121 or attaching the temporary plug 135, thereby preventing gas leakage and the like. be able to.

  After sealing between the main pipe 111 and the service chi 115 with the temporary stopper 135, as shown in FIG. 14, the no blow gas bag 131 and the bag fixing jig 133 are removed, and the cutting cutter 1 (FIG. 14, the rising pipe portion 117 of the service chi 115 is cut and removed together with the branch pipe 113. As described above, when the root of the rising pipe portion 117 of the service chi 115 is cut, the horizontal pulling remaining portion including the branching portion 119 of the service chi 115 can be completely removed.

  Next, an operation for fusing the main plug to the cut end portion of the riser portion 117 will be described. In this embodiment, a fusion work using butt fusion (see FIG. 15), electric fusion (see FIGS. 16 and 17), and rotational friction fusion (see FIG. 18) will be described.

First, butt fusion will be described.
FIG. 15 is a side cross-sectional view of the vicinity of the branch pipe cutting portion showing the method for removing the resin branch pipe according to this embodiment. (A) is a figure which shows the main plug fusion | fusion operation | work using butt fusion | fusion, (B) is a figure which shows this plug fusion | fusion state.
The butt fusion uses a butt fusion machine having a heater 103 as schematically shown in FIG. One surface (lower surface in the figure) of the heater 103 of this butt fusion machine is applied to the cut end surface 117x of the riser pipe portion 117, and the fusion end surface 137x of the main plug 137 is applied to the other surface (upper surface in the drawing) of the heater 103. . When the heater 103 is caused to generate heat, both ends 117x and 137x are melted by this heat. After the both end surfaces 117x and 137x are melted to a degree sufficient for fusion, the heater 103 is extracted, and the fusion end surface 137x is pressed against the cut portion end surface 117x with the handle 137a of the main plug 137. Then, as shown in FIG. 15B, the both surfaces 117x and 137x are fused at the fused portion X, and the cut portion of the riser portion 117 is closed by the main plug 137.

Next, electrofusion will be described.
FIG. 16 is a view showing a main plug according to the present embodiment. (A) is a side view, (B) is a bottom view (bottom view).
FIG. 17 is a view for explaining a method of fusing the main plug of FIG. 16 to the cutting portion of the service team of FIG.
In the present embodiment, a main plug 171 as shown in FIG. The main plug 171 is made of a resin such as polyethylene, and has an insertion protrusion 175 formed on the lower surface of the plug main body 173. The insertion convex portion 175 is inserted inside the cut portion of the rising pipe portion 117 of the service chi 115. A conductive wire 175 a is embedded in the outer peripheral surface of the insertion protrusion 175. A terminal 177 that connects the cable 179 is provided on the outer peripheral surface of the plug body 173. When power is supplied from a power source (not shown) through the cable 179, a current is supplied from the terminal 177 to the conductive wire 175a, and the insertion protrusion 175 is heated.

  A method (one example) of fusing the main plug 171 to the cutting part of the riser pipe part 117 of the service chi 115 is as follows. FIG. 17 shows the service chi 115 and the main pipe 111 in a state where the temporary stopper 135 is pushed in and the root of the rising pipe portion 117 is cut. With respect to the service chi 115, first, the insertion convex portion 175 of the main plug 171 is inserted into the cutting portion and is closed by the plug main body 173. Then, the holding plate 180 is applied from the upper side of the plug body 173 and the band 181 is passed through the lower end of the main tube 111. The band 181 is locked to the locking protrusions 116b and 116c of the saddle portion 116 of the service chi 115 and tightened firmly. Thereafter, when the cable 179 is connected to the terminal 177 of the main plug 171 and energized, the conductive wire 175a of the insertion convex portion 175 generates heat, and the main plug 171 and the cut portion are melted and fused.

Next, rotational friction fusion will be described.
FIG. 18 is a view for explaining a method for fusing the plug using the rotary friction fusing tool in the present embodiment.
The main plug 171 ′ used for rotational friction welding is made of a resin such as polyethylene and has a taper formed on the outer peripheral edge of the lower end. The rotary friction welding tool 190 has a rod 191 on which the main plug 171 'is rotatably attached. These engagements may be performed by a simple method such as one in which the tip of the rod 191 is engaged with a groove cut in the end face of the main plug 171 ′. This rod 191 is rotationally driven by a stepping motor 193. The casing of the stepping motor 193 can be provided with a tool fixing portion 195 for fixing to a base (not shown) and a handle 199 for gripping manually. A bearing 197 is interposed between the casing of the stepping motor 193 and the rod 191. The rod 191 is directly coupled to the rotating shaft of the stepping motor 193, and rotates synchronously with this rotating shaft.

  The main plug 171 ′ is welded to the cut portion of the riser pipe portion 117 of the service team 115 using the rotary friction welding tool 190 as described above. First, the main plug 171 ′ is attached to the rod 191 of the rotary friction welding tool 190, and the tool fixing portion 195 is fixed to a base (not shown), or the handle 199 is grasped and lifted up. Rotate. Then, the taper of the main plug 171 ′ that rotates together with the rod 191 is applied to the cutting portion of the rising pipe portion 117. When the main plug 171 ′ rotating with the rod 191 comes into contact with the cut portion of the riser pipe portion 117, friction heat is generated between them, and the temperature rises to the vicinity of the melting point of polyethylene which is the material of the main plug 171 ′ and the service chi 115. Then, both of these begin to melt and are mixed and integrated.

By the way, in the above-mentioned embodiment, although the form which pushes in the temporary stopper 135 using the no blow gas bag 131 was described, as shown in FIGS. 19-21, the joint sealing tool 150 (in the figure, code | symbol 159 is an adapter). The temporary stopper 135 can be pushed in by using.
FIG. 19 is a partial cross-sectional side view showing a cutter removing operation using a joint sealing tool in a method for removing a resin branch pipe according to another embodiment of the present invention.
FIG. 20 is a partial cross-sectional side view showing a shutter closed state of the joint sealing tool in the resin branch pipe removing method.
FIG. 21: is a partial cross section side view which shows the temporary stopper attachment operation | work using the joint sealing tool in the removal method of the resin branch pipe.

  As schematically shown in these drawings, the joint sealing tool 150 includes a box-shaped tool body 151. A lid 153 that can be opened and closed is attached to the upper surface side of the tool body 151 with a clip 155. Tools such as a hexagon wrench fly 100 and a push bar 102 can be inserted into the lid 153, and the airtight state in the tool body 151 is maintained even when these tools are inserted. The tool main body 151 is provided with a shutter 157 that partitions the interior into two upper and lower spaces 150A and 150B (see FIG. 20). Such a joint sealing tool 150 is attached to the upper end of the rising pipe portion 117 of the service team 115 via the adapter 159 at the lower end of the tool body 151. With this adapter 159, the same joint sealing tool 150 can be applied to a plurality of types of service teams having different tube diameters.

  When using this joint sealing tool 150, after removing the cheek cap 118 of the service chi 115 (see FIG. 9), the tool main body 151 is attached to the upper end of the rising pipe portion 117 via the adapter 159. Then, as shown in FIG. 19, with the shutter 157 opened, the hexagon wrench fly 100 is inserted from the outside of the lid 153, and the perforating cutter 121 in the rising pipe portion 117 is turned up as described above. After the punch cutter 121 is pulled up into the upper half space 150A of the tool body 151, as shown in FIG. 20, the shutter 157 is first closed to seal the lower part of the lower half space 150B in the tool body 151, and then the clip 155 is removed, the lid 153 is opened, and the perforating cutter 121 is extracted together with the hexagon wrench fly 100. Further, as shown in FIG. 21, after the temporary stopper 135 is attached to the push-in bar 102 and accommodated in the tool body 151, the lid 153 is closed and then the shutter 157 is opened again. Push toward the tube 111 side. As described above, when the joint sealing tool 150 is used, gas leakage and the like can be prevented when removing the perforating cutter 121 or attaching the temporary stopper 135 as in the case of using the no-blow gas bag 131. it can.

  As described above, according to the respective embodiments of the present invention, the no-blowing gas bag 131 and the joint sealing tool 150 can be used for the work of attaching the temporary stopper 135, and the butt is used for the fusion of the stoppers 137, 171 and 171 '. Fusion, electric fusion, and rotational friction fusion can be used. Thereby, the specific variation of removal work can be increased.

It is a figure which shows the cutting cutter which concerns on this Embodiment, and is a side view which shows the attachment state to the service chi fuse | fused to the main pipe. It is a figure which shows the same cutting cutter, and is a top view (figure seen from the upper side of FIG. 1) which shows the attachment state to the service chi fuse | fused by the main pipe. It is a figure which shows the same cutting cutter, and is a front view (figure seen from the right side of FIG. 1) which shows the attachment state to the service chi fused to the main pipe. It is the perspective view which shows the state which isolate | separated the base and cutting part of the cutting cutter, and a service chi. It is a figure which shows the same cutting cutter, and is a top view which shows the state which advanced the cutter blade of the cutting part from the state of FIG. It is a figure which shows the same cutting cutter, and is a top view which shows the state which advanced the cutter blade of the cutting part further from the state of FIG. 5, and cut | disconnected the rise pipe part of the service chi. It is a figure which shows the same cutting cutter, and is a top view which shows the state attached to the saddle part (original pipe with a large diameter) with a large width | variety. It is a partial cross section side view which shows the state before removal in the removal method of the resin branch pipes concerning this invention. It is a partial cross section side view which shows the state which removed the cheek cap in the removal method of the resin branch pipes. It is a partial cross section side view which shows the sealing work bag attachment state in the removal method of the resin branch pipe. It is a partial cross section side view which shows the cutter removal and temporary stopper attachment operation | work in the sealing operation | work bag in the removal method of the resin branch pipe. It is front sectional drawing which shows the cutter raising state in the removal method of the resin branch pipe. It is front sectional drawing which shows the temporary stopper attachment state in the removal method of the resin branch pipe. It is a partial cross section side view which shows the cutting state of the standup pipe part in the removal method of the resin branch pipe. It is side surface sectional drawing of the branch pipe cutting part vicinity which shows the removal method of the resin branch pipe which concerns on a present Example. (A) is a figure which shows the main plug fusion | fusion operation | work using butt fusion | fusion, (B) is a figure which shows this plug fusion | fusion state. It is a figure which shows this stopper which concerns on a present Example. (A) is a side view, (B) is a bottom view (bottom view). It is a figure explaining the method to melt | fuse the main plug of FIG. 16 to the cutting part of the service chi of FIG. It is a figure explaining the method of melt | disconnecting this plug using the rotary friction welding tool in a present Example. It is a partial cross section side view which shows the cutter removal operation | work using the joint sealing tool in the removal method of the resin branch pipe which concerns on the other Example of this invention. It is a partial cross section side view which shows the shutter closed state of the joint sealing tool in the removal method of the resin branch pipe. It is a partial cross section side view which shows the temporary stopper attachment operation | work using the joint sealing tool in the removal method of the resin branch pipe. It is a partial cross section side view which shows an example of resin piping using a Qi type electric fusion joint. It is a partial cross section side view which shows the outline | summary of the removal method of the conventional resin branch pipe. It is a partial cross section side view which shows the outline | summary of the removal method of the conventional resin branch pipe. It is a partial cross section side view which shows the outline | summary of the removal method of the conventional resin branch pipe.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting cutter 10 Base 11 Block 11a Engagement protrusion 12 (12A, 12B), 13 (13A, 13B) Guide bar 15, 16 Slide plate 15A, 15B, 16A, 16B Slide sleeve 21 Mounting part 23 Projection step part 25 End surface plate 26 Engaging groove 31, 32 Detachable fixing portion 33, 34 Upper plate 35, 36 Bolt 37, 38 Lower plate 50 Cutting portion 51 Engaging member 51a Edge 55 Screw support member 56 Female screw plate 57 Feed screw 59 Grasping rod 61, 62 Guide rod 71, 72 Moving block 73 Cutter blade 75 Feed plate 76, 77 Connecting plate 100 Hexagon wrench fly 102 Bar 103 (Vat fusion machine) heater 111 Main pipe 113 Branch pipe 115 Service team 116 Saddle 116a-116c Locking Protrusion 117 Rise pipe part 118 Chicap 119 Branch 121 Hole Cutter 123 Electric Fusion Socket 131 No Blow Gas Bag 131a Throttle Port 131b Guard Plate 133 Bag Fixing Jig 135 Temporary Plugs 137, 171, 171 ′ Main Plug 150 Joint Sealing Tool 151 Tool Body 153 Lid 155 Clip 157 Shutter 159 Adapter 190 Rotary friction welding tool

Claims (11)

A saddle portion that is fused to the outer surface of the main pipe,
A riser pipe rising from the saddle part;
A cutter that cuts the riser portion of the resin joint comprising:
The cutter
A base fixed to the saddle portion;
A turret having a cutter blade pressed against the riser portion, and a cutting portion having a feed mechanism attached to the base for moving the turret forward and backward,
A cutter for cutting a plastic joint, comprising:   The cutter for cutting a resin joint according to claim 1, wherein the cutting part is detachable from the base part. The base is
An engaging portion that engages with the upper surface of the saddle portion;
An attachment portion provided at the engagement portion to which the feed mechanism of the cutting portion is attached;
Guide bars provided in the engaging portion, respectively extending in both sides of the saddle portion in the width direction (radial direction of the main pipe);
A slide member that is slidably attached to each of these guide bars, and that is disposed on both sides of the saddle portion,
A detachable fixing portion provided on each of the slide members, detachably fixed to both end edges in the width direction of the saddle portion,
The resin joint cutting cutter according to claim 1, wherein the cutter is provided. The feeding mechanism is
A frame having a pair of guide rods disposed on both sides of the saddle portion in the width direction (the radial direction of the main tube) across the riser tube portion;
A movable tool rest fixed to the guide rod and fixed to the cutter blade;
A feed screw attached to the frame for moving the movable tool post along the guide rod;
The resin joint cutting cutter according to claim 1, 2, or 3.   The resin joint cutting cutter according to claim 4, wherein the frame of the feed mechanism is provided with a contact portion to which a hand is applied when operating the feed screw. The frame of the feed mechanism has a frame member that can be swung around one end of the pair of guide rods spanned between one end portions of the pair of guide rods,
6. The cutter for cutting a resin joint according to claim 4, wherein the frame member is freely attachable / detachable to / from the attachment portion of the base portion. A saddle portion that is fused to the outer surface of the main pipe,
A riser pipe rising from the saddle part;
A method of cutting the riser portion of the resin joint comprising a resin joint cutting cutter,
The cutter is
A base fixed to the saddle portion;
A turret having a cutter blade pressed against the riser portion, and a cutting portion having a feed mechanism attached to the base for moving the turret forward and backward,
With
Fixing the base to the saddle,
The turret is fed toward the rising pipe portion by the feeding mechanism of the cutting portion,
A resin joint cutting method, wherein the cutter blade is pressed against the rising pipe portion and cut. A method of removing a resin branch pipe connected to a main pipe via a service chi,
The service chi
A saddle portion having a through hole communicating with the main pipe;
A rising pipe portion rising from the periphery of the through hole of the saddle portion;
A bifurcation extending from the riser pipe and extending;
A cheek cap detachably provided at the upper end of the riser portion,
A perforated cutter built into the pipe of the rising pipe part and capable of being inserted through the through hole of the saddle part,
The saddle part is applied to the outer surface of the main pipe and fused, and the branch part is connected to the resin branch pipe via a joint,
Removing the chee cap from the riser part of the service chi;
Attach a sealing work tool to the mounting part of the cheek cap of the riser part,
Inside the sealing work tool, put a temporary stopper toward the main pipe side in the riser pipe part, and seal between the main pipe side and the riser pipe part,
On the downstream side of the temporary stopper, the base portion of the rise pipe portion of the service chi is cut by the resin joint cutting method according to claim 7,
A method of removing a resin branch pipe, wherein the plug is attached to an end of the cut riser section.   9. The method for removing a resin branch pipe according to claim 8, wherein the main plug is attached to a cut portion of the rising pipe portion by butt fusion.   The method for removing a resin branch pipe according to claim 8, wherein the main plug is attached to a cut portion of the rising pipe portion by electric fusion. 9. The method of removing a resin branch pipe according to claim 8, wherein the main plug is applied to a cutting part of the riser pipe part while rotating, and is fused by frictional heat generated between them.

Images