JP7033787B2 - Piping cutting device - Google Patents

Description

The present invention relates to a pipe cutting device that cuts a part of the wall thickness of a pipe in the pipe axial direction.

Patent Document 1 discloses a cutting blade for inserting a newly provided new pipe (replacement resin pipe) into an existing pipe (buried resin pipe). This cutting blade is provided in a diameter expanding device that expands the inner diameter of an existing pipe. The diameter expansion device is provided with a main body component that expands the diameter of an existing pipe, a tapered surface at the tip of the main body portion, and a plurality of the cutting blades on the front side of the tapered surface, and a new pipe is connected to the rear side of the main body component. Has been done. Each of the cutting blades is set to be smaller than the wall thickness of the existing pipe so as to form a notch for diameter expansion in the existing pipe.

In Patent Document 1, a diameter-expanding device is used to form a diameter-expanding cut by cutting an existing pipe along the pipe axis direction and cutting the wall thickness halfway by a cutting blade arranged on the front side of the tapered surface. Insert the new pipe into the existing pipe.

Japanese Unexamined Patent Publication No. 10-184996

In Patent Document 1, a cutting blade arranged on the front side of the tapered surface is used to form a diameter-expanding cut in the existing pipe, and the inner diameter of the existing pipe is expanded at the main body portion. However, depending on how the tapered surface hits the existing pipe (inclination direction), the notch for diameter expansion may be poorly cut.

Therefore, an object of the present invention is to provide a pipe cutting device capable of reliably cutting the inner diameter of a pipe.

The present invention is a pipe cutting device that cuts a pipe in the direction of the pipe axis, and has a tapered surface whose front end is smaller than the inner diameter of the pipe and is enlarged toward the rear side, and a tapered surface on the rear side of the tapered surface. It is characterized in that it includes an arranged cylindrical surface and a cutting blade arranged on the cylindrical surface, and the height of the cutting blade is set higher than the wall thickness of the pipe.

In the above configuration, when the cylindrical surface guided by the tapered surface is inserted into the inner diameter of the pipe in the pipe axis direction, the cutting blade protrudes from the cylindrical surface close to the inner diameter of the pipe instead of the tapered surface. The pipe can be cut in the pipe axis direction by a cutting blade set higher than the wall thickness of the pipe regardless of how the tapered surface hits the inner diameter.

In the present invention, it is possible to adopt a configuration including a cord for pulling the tapered surface from the outlet of the pipe.

In the above configuration, since the tapered surface is inserted by pulling from the outlet through the cord instead of pushing toward the outlet of the pipe, it is easy to insert the tapered surface and the cylindrical surface into the inner diameter of the pipe. Cutting in the pipe axis direction with a cutting blade is also easy.

In the present invention, the cylindrical surface can be configured to have a diameter larger than the inner diameter of the pipe.

According to the above configuration, since the cylindrical surface has a larger diameter than the inner diameter of the pipe, the inner diameter is increased to stabilize the cutting of the pipe by the cutting blade.

According to the pipe cutting device of the present invention, since the cutting blade protrudes from the cylindrical surface close to the inner diameter of the pipe, the cutting blade is set higher than the wall thickness of the pipe regardless of how the tapered surface hits the inner diameter of the pipe. The wall thickness of the pipe can be reliably cut by the cutting blade.

It is a schematic diagram of the water supply and hot water supply piping in a house which shows one Embodiment of this invention. It is sectional drawing of the state in which the hot water supply passage of the hot water supply pipe is cut. It is sectional drawing which shows the construction state of the same entrance processing process. It is a detailed view of the same entrance processing apparatus. The construction state of the main cutting process is shown, (a) is a cross-sectional view in which the cord is inserted from the outlet to the inlet, and (b) is a cross-sectional view in which the second cutting portion is inserted to the stepped surface. (C) is a cross-sectional view of a state in which the second cutting portion is inserted to the outlet. It is a detailed view of the entrance side apparatus provided with the 2nd cutting part. It is a detailed view of the joint. It is sectional drawing which shows the construction state of the curved part in the same main cutting process. The construction state of the cutting process is shown, (a) is a cross-sectional view in which the cut portion is inserted halfway in the pipe axis direction between the inlet and the outlet, and (b) is a cross-sectional view in which the cut portion is inserted to the outlet. be. It is a detailed view of the cut part, (a) is a plan view, (b) is a side view. It is sectional drawing which shows the construction state of the curved part in the same cutting process. It is a front view of the state where a part of the hot water supply passage was cut in the same cutting process. The construction state of the insertion step is shown, (a) is a cross-sectional view before inserting the relay member from the inlet, and (b) is a cross-sectional view of a state where the new pipe is inserted into the hot water supply channel. It is sectional drawing of the state in which the new pipe is inserted into the relay member. It is a detailed view of the relay member, (a) is a side view, (b) is a front view. It is a perspective view of the relay member. It is sectional drawing which shows the construction state of the curved part in the same insertion process. It is explanatory drawing of the entrance side apparatus and the exit side apparatus which show the same another embodiment. It is explanatory drawing of the main cutting process which shows the other embodiment, (a) is the sectional view of the state which connected the pipe side joint to the hot water supply passage, and the rod side joint is connected to the rod main body, (b) is the second. The cross-sectional view in the state where the cut portion is inserted into the hot water supply passage, and (c) is the cross-sectional view in the state where the removing means is connected. It is sectional drawing of the curved part correction process which shows the same another embodiment.

Hereinafter, a method of constructing a pipe according to an embodiment of the present invention will be described with reference to the drawings regarding a case where a new flexible new pipe is inserted into an existing pipe. This construction method is an improved construction method for water supply pipes and hot water supply pipes. First, the outline of the water supply pipe and hot water supply pipe used in a general house will be explained.

As shown in FIG. 1, in general, the hot water supply pipe 1 and the water supply pipe 2 in a house are covered with a floor surface 3 at least in the middle of the pipe axial direction L. The pipe axis direction L is a direction along the axis center of the hot water supply pipe 1 or the water supply pipe 2. Further, the outlet 5 is exposed from the floor surface 3 from the inlet 4 in the pipe axis direction L, the inlet 4 of the hot water supply pipe 1 is connected to the water heater via the header member 6, and the outlet 5 is, for example, a bathroom faucet 7. It is connected to the.

Since the hot water supply pipe 1 and the water supply pipe 2 have the same configuration, if the hot water supply pipe 1 is also used as the water supply pipe 2, the hot water supply pipe 1 has a heat insulating material 9 (protective material), a cross-linked polyethylene pipe, and a polybutene pipe. Or, it is formed by inserting a hot water supply passage 10 (supply pipe) such as an aluminum three-layer pipe. Further, the hot water supply pipe 1 is firmly fixed to a slab 3a or the like arranged under the floor surface 3 at predetermined intervals in the pipe axis direction L.

This embodiment describes the hot water supply pipe 1. This embodiment is a pipe construction method in which a new new pipe 11 (see FIG. 13) is installed along the pipe axial direction L inside the hot water supply pipe 1 which is an existing pipe.

The pipe axial direction L is a direction along the axial direction of the hot water supply pipe 1, and the new pipe 11 is also inserted along the pipe axial direction L of the hot water supply pipe 1. The new pipe 11 becomes a new hot water supply pipe 1. In this construction method, basically, the new pipe 11 is made into a new hot water supply pipe 1 (new pipe) by inserting the new pipe 11 into the hot water supply passage 10 as the water supply pipe. The new pipe 11 is formed of a cross-linked polyethylene pipe, a polybutene pipe, a flexible metal pipe, or the like, and is a flexible pipe. In the hot water supply channel 10, the inlet 4 and the outlet 5 specify the inlet 4 as the rear and the outlet 5 as the front.

To specifically explain the construction method of the piping according to this embodiment,
(1) The inner diameter φ1 of the hot water supply path 10 from the inlet 4 to the outlet 5 in the pipe axial direction L is set by a cutting tool (in this case, the first cutting portion 12 shown in FIG. 4) according to the outer diameter φ3 of the new pipe 11. Diameter expansion process that expands by cutting by the second cutting part 26) shown in 6.
(2) A cutting step of cutting the pipe axial direction L in the hot water supply passage 10 by a cutting portion (in this case, the pipe cutting device 56 shown in FIG. 10).
(3) An insertion step of inserting a new pipe 11 into a hot water supply passage 10 whose inner diameter φ1 has been expanded by a diameter expansion step by pulling it from an outlet 5 with an insertion tool (in this case, the pipe insertion port 64 shown in FIG. 14).
And have.

In this construction method, the heat insulating material 9 and the hot water supply passage 10 have a circular cross section, and as shown in FIG. 2, the outer diameter φ3 of the hot water supply passage 10 is 13 mm, and the inner diameter φ1 of the hot water supply passage 10 is 10 mm. The new pipe 11 also has a circular cross section, and as shown in FIG. 14, the outer diameter φ3 is 13 mm and the inner diameter φ1 is 10 mm.

The diameter expansion step of (1) described above will be described in more detail. The diameter expansion step (1) includes a removal step, an inlet processing step, and a main cutting step in order.

[Removal process]
As shown in FIG. 1, the removal step is a step of setting a region of the hot water supply pipe 1 exposed to the floor surface 3 as a free end for one hot water supply pipe 1.

The construction method of the removal process is to remove one end (inlet side end) of the hot water supply pipe 1 from the header member 6 to make it the inlet 4, and remove the other end (outlet side end) of the hot water supply pipe 1 from the faucet 7. The outlet 5 is a single heat insulating material 9 including a linear and curved area (for example, the curved portion 55 in FIG. 8) and the hot water supply channel 10, so that the inlet 4 and the outlet 5 are free ends.

In this removal step, the intermediate portion of the hot water supply pipe 1 remains firmly fixed to the slab 3a as described above, and thus includes the linear and curved regions of the hot water supply pipe 1 (insulation material 9 and hot water supply passage 10). Remains.

[Inlet processing process]
As shown in FIGS. 1 and 2, the inlet processing step is a step of cutting the inner diameter φ1 of the hot water supply passage 10 starting from the inlet 4 of the hot water supply passage 10 in the hot water supply pipe 1. In the inlet processing step, in order to cut the inner diameter φ1 on the inlet 4 side of the hot water supply path 10, as shown in FIGS. The device 13 is used.

In the inlet processing step, the inner diameter φ1 of the hot water supply passage 10 is cut by the amount that the second cutting portion 26 used in the main cutting step, which will be described later with reference to FIG. 5, can be inserted.

As shown in FIG. 3, the configuration of the inlet processing device 13 (also referred to as “boring bar”) used in the inlet processing step will be described. As shown in FIGS. 3 and 4, the inlet processing device 13 has a first handle 15 that can be attached to and detached from the tip of the power tool (drive unit) 14, and the first cutting portion 12 that is arranged on the tip side of the first handle 15. And a first connecting portion 16 for connecting the first handle 15 and the first cutting portion 12.

As shown in FIG. 4, the power tool 14 has a general configuration and is of an impact driver type, and the main body 17 of the power tool 14 has a first handle 15 connected to its tip and a first cutting portion. 12 is rotated so that the tube axis direction L is the center of rotation.

The first handle 15 in the inlet processing device 13 is formed in a shape relative to the tip shape of the power tool 14 and is fixed to the tip of the power tool 14. The first handle 15 is formed to have a length in the pipe axis direction L that can withstand gripping of the power tool 14 so as to be along the tube axis direction L. Further, it is desirable that the outer diameter of the first handle 15 is smaller than the inner diameter φ1 of the hot water supply passage 10.

As shown in FIG. 4, the first cutting portion 12 in the inlet processing device 13 is composed of a first cutting edge surface 18 and a plurality of first cutting blades 19. Each first cutting blade 19 is integrally configured as a key sheet cutter-shaped blade portion on the outer periphery of the first blade surface 18.

The tip end side of the first cutting blade 19 is the first tapered surface 20. That is, the tip of the first cutting blade 19 has the same diameter as the first blade surface 18 and has a smaller cross section than the inner diameter φ1 of the hot water supply passage 10, and the rear end is larger than the inner diameter φ1 of the hot water supply passage 10. It is the first tapered surface 20. The outer diameter of the rear portion of the first tapered surface 20 in each first cutting blade 19 is a first large diameter surface 21 larger than the inner diameter φ1 of the hot water supply path 10. Further, the outer diameter of the first large diameter surface 21 is set to be smaller than the outer diameter φ3 of the hot water supply passage 10. The tip blade surface of each first large diameter surface 21 is parallel to the pipe axis direction L.

A one-sided spring seat 22a is provided at the rear end of the first cutting blade 19. The one-side spring seat 22a has a screw 19a provided at its tip fixed to a screw hole 19b formed at the radial center of the first cutting portion 12 by screwing. The one-side spring seat 22a has a circular cross section, and its outer diameter is set to be smaller than that of the first large diameter portion 21 (inner diameter φ1 of the hot water supply passage 10). A spring seat 23a on the other side is provided at the tip (the other end) of the first handle 15. The other side spring seat 23a is provided so as to cut the tip of the first handle 15. The other side spring seat 23a has a circular cross section, and its outer diameter is set to be smaller than that of the first large diameter portion 21 (inner diameter φ1 of the hot water supply passage 10).

The first connecting portion 16 of the inlet processing device 13 is naturally composed of a linear torsion coil spring. The tip of the first connecting portion 16 is internally fitted and crimped to the one-side spring seat 22a, so that the tip of the first connecting portion 16 is fitted and supported by the one-side spring seat 22a in a non-rotating manner. The other end of the first connecting portion 16 is internally fitted and crimped to the other side spring seat 23a, so that the other end of the first connecting portion 16 is non-rotatably fitted and supported by the other side spring seat 23a. Further, since the first connecting portion 16 is exposed and free between the one-side spring seat 22a and the other-side spring seat 23a, it is flexible between the one-side spring seat 22a and the other-side spring seat 23a. Has. The first connecting portion 16 is formed to have a diameter smaller than the diameter of the one-side spring seat 22a and the other-side spring seat 23a.

A construction method of an inlet processing step using the inlet processing device 13 having such a configuration will be described. In the inlet machining step, the operator grips the first handle 15 of the inlet machining device 13 at the tip of the power tool 14 to support the inlet machining device 13 by the power tool 14, and at the inlet 4 of the hot water supply passage 10 the first. (1) The first tapered surface 20 of the first cutting blade 19 in the cutting portion 12 is fitted.

The tip of the first tapered surface 20 of the first cutting blade 19 is set to be smaller than the inner diameter φ1 of the hot water supply path 10, and the outer diameter of the rear part of the first tapered surface 20 is made larger than the inner diameter φ1 of the hot water supply path 10. Therefore, the first cutting blade 19 can be reliably fitted to the inlet 4 of the hot water supply passage 10 on the first tapered surface 20.

In this way, the operator rotates the main body 17 of the power tool 14 and pushes the first cutting portion 12 via the first handle 15 and the first connecting portion 16. When the operator pushes the entire inlet processing device 13, the first handle 15 of the inlet processing device 13 is supported by the power tool 14, and the first connecting portion 16 is supported by the one-side spring seat 22a and the other-side spring seat 23a. Therefore, the entire inlet processing device 13 rotates about the pipe axis direction L by the drive of the main body 17, and proceeds to the outlet 5 side along the pipe axis direction L.

When the first cutting portion 12 rotates, as shown in FIG. 3, the first tapered surface 20 of the first cutting blade 19 is guided in the pipe axis direction L, and the first large diameter surface 21 larger than the inner diameter φ1 of the hot water supply path 10 Then, the hot water supply passage 10 is cut by leaving the outer wall thickness by the first large diameter surface 21 smaller than the outer diameter φ3 of the hot water supply passage 10. Further, the first large-diameter surface 21 is a blade portion in the shape of a key sheet cutter, so that the inner diameter of the hot water supply passage 10 is smoothly cut.

As described above, the section for pushing the inlet processing device 13 in the pipe axial direction L is only the portion into which the second cutting portion 26 used in the main cutting step, which will be described later, can be inserted, and the inlet processing device 13 is in this section. The inner diameter φ1 of the hot water supply passage 10 is cut. The section that pushes the inlet processing device 13 in the pipe axis direction L may be a section in which the first handle 15 does not enter the hot water supply passage 10.

Further, since the outer diameter of the one-side spring seat 22a is set to be smaller than the inner diameter φ1 of the hot water supply passage 10, the one-side spring seat 22a may collide with the hot water supply passage 10 while pushing the inlet processing device 13. do not have. Further, since the outer diameter of the first connecting portion 16 is formed to be smaller than the outer diameter of the one-side spring seat 22a and the other-side spring seat 23a, the first connecting portion 16 is formed while pushing the inlet processing device 13. Does not collide with the hot water supply channel 10.

As described above, the first cutting portion 12 rotates, and the hot water supply path 10 is cut by the first large-diameter surface 21 having an inner diameter of φ1 of the first tapered surface 20 leaving the outer wall thickness. Specifically, the first large-diameter surface 21 is cut so as to leave the inner diameter φ1 of the hot water supply passage 10 by approximately 0.5 to 1.0 mm (represented by δ in FIG. 2). As a result, the inner diameter φ1 becomes an inner diameter φ2 larger than the original inner diameter φ1 (inner diameter φ1 of the existing pipe).

After that, the power tool 14 is pulled to remove the inlet processing device 13 from the inlet 4 of the hot water supply passage 10, and the inlet processing process is completed. When the inlet processing step is completed, a stepped surface 25 due to the first tapered surface 20 is formed at the tip of the inlet processed region of the hot water supply passage 10. By this inlet processing step, the inner diameter of the hot water supply passage 10 at a predetermined position including the inlet 4 of the hot water supply passage 10 is processed from the inner diameter φ1 to the inner diameter φ2.

[Main cutting process]
In the main cutting step, hot water is supplied from the inlet 4 to the outlet 5 including the stepped surface 25 in a state where the inner diameter φ2 of the processing region including the inlet 4 in the hot water supply path 10 is machined by the inlet machining step. This is a process of cutting the inner diameter φ1 of the road 10 to the inner diameter φ2. As shown in FIG. 5, a pipe cutting device 27 provided with the second cutting portion 26 is used in the main cutting step.

The configuration of the pipe cutting device 27 will be described. As shown in FIG. 5, the pipe cutting device 27 includes an inlet side device 28 inserted from the inlet 4 and an outlet side device 29 inserted from the outlet 5.

As shown in FIGS. 5B and 5C, the inlet side device 28 includes a flexible shaft 30 and a second cutting portion 26 provided at the tip of the flexible shaft 30. As a device for driving the second cutting portion 26, an electric tool 14 (see FIG. 3) is provided. As shown in FIGS. 5A and 7, the exit side device 29 includes a cord 31 (a wire is used) and a joint 33. The outer diameter of the cord 31 is formed sufficiently smaller than the inner diameter φ1 of the hot water supply passage 10. A traction unit 32 is arranged as a device for traction of the cord 31, and a winch is used as the traction unit 32 as shown in FIG. 5 (c). The traction portion 32 holds the cord 31 around freely.

As shown in FIG. 6, in the inlet side device 28, the outer shape of the second cutting portion 26 has the same configuration as that of the first cutting portion 12 (see FIG. 4) in the inlet processing device 13. The second cutting portion 26 is composed of a second blade surface 35 and a plurality of second cutting blades 36. Each second cutting blade 36 is integrally configured as a key sheet cutter-shaped blade portion on the outer periphery of the second blade surface 35.

The tip end side of the second cutting blade 36 is a second tapered surface 37. The tip of the second cutting blade 36 of the second tapered surface 37 has the same diameter as the second blade surface 35 and has a smaller cross section than the inner diameter φ1 of the hot water supply path 10, and the rear end is larger than the inner diameter φ1 of the hot water supply path 10. The second tapered surface 37. The outer diameter of the rear part of the second tapered surface 37 in each second cutting blade 36 is a second large diameter surface 38 larger than the inner diameter φ1 of the hot water supply path 10, and the outer diameter of the second large diameter surface 38 is the hot water supply path 10. The outer diameter is set smaller than φ3. The tip blade surface of each second large diameter surface 38 is parallel to the pipe axis direction L.

A one-sided spring seat 22b is connected to the second cutting portion 26. The one-side spring seat 22b has a cylindrical side surface 22c, a bottom surface 22d having a circular cross section, and a screw 36a. One side of the second connecting portion 43 (corresponding to the transmission shaft portion) is fitted inside the side surface 22c of the one-side spring seat 22b, and the side surface 22c is crimped to be integrated with the second connecting portion 43. The screw 36a is formed at the tip of the bottom surface 22d at the center in the radial direction. A screw hole 36b for screwing the screw 36a is formed at the radial center on the other side of the second cutting portion 26. Further, a screw hole 40a for attaching the joint 33 is formed at the radial center on one side of the second cutting portion 26.

As shown in FIGS. 5 (b) and 5 (c), the flexible shaft 30 of the inlet-side device 28 has a second handle 41 that can be attached to and detached from the tip of the above-mentioned electric tool 14 (see FIG. 3), and as shown in FIG. One side is supported by a bearing device (drive body) 42 provided concentrically with the second handle 41 and one side spring seat 22b, and one side is supported by the other side spring seat 23b fitted inside the bearing device 42. It is composed of a second connecting portion 43 and a rod-shaped member 44 that covers a part of the second connecting portion 43 from the outside. The second connecting portion 43 is composed of a torsion coil spring and has flexibility.

The second handle 41 is formed in a shape relative to the tip shape of the power tool 14, and is fixed to the tip of the power tool 14. The bearing device 42 rotatably supports the second handle 41 with respect to the support device 45 (corresponding to the outer shell of the bearing device 42) arranged outside the bearing device 42. The support device 45 is supported by the operator's fingers. In this support device 45, a large diameter portion 45a and a small diameter portion 45b that are communicated with each other are arranged in the front-rear direction by a screw (reference numeral omitted), and the small diameter portion 45b is arranged in the front. The second handle 41 is inserted into the support device 45 from the radial center of the large diameter portion 45a.

The other side spring seat 23b that supports the other end of the second connecting portion 43 is provided in the intermediate region of the support device 45 in the pipe axial direction L. The other-side spring seat 23b is a portion in which the other-side portion of the second connecting portion 43 is internally fitted and integrated by caulking, and is composed of a cylindrical side surface 23c and a bottom surface 23d having a circular cross section. The second handle 41 and the other side spring seat 23b are parallel to the pipe axis direction L. The internal region of the support device 45 in the second handle 41 and the bottom surface 23d of the other side spring seat 23b are firmly joined in the pipe axis direction L.

The structure of the internal region of the support device 45 in the second handle 41 is configured to rotate around the tube axial direction L via a slide bearing (reference numeral omitted) inside the support device 45. That is, the internal regions of the support device 45 and the support device 45 in the second handle 41 rotate relative to each other. Therefore, since the internal region of the support device 45 in the second handle 41 and the bottom surface 23d of the other side spring seat 23b are firmly joined in the pipe axis direction L, the rotation of the second handle 41 causes the second handle 41 to rotate. The other side spring seat 23b also rotates.

The rod-shaped member 44 extends forward from the other side spring seat 23b, and includes a rod body 47 that covers the pipe axial direction L of the second connecting portion 43 in the middle portion and a lid body 48 that closes the opening of the rod body 47. , A support member 49 arranged on the front side of the lid 48 is provided. The rod body 47, the lid 48, and the support member 49 have a circular cross section.

The outer diameter of the rod body 47 is formed to be smaller than the inner diameter φ1 of the hot water supply passage 10, and the outer diameter of the lid 48 is set to be smaller than the outer diameter of the second large diameter surface 38 of the second cutting portion 26. .. The material of the rod body 47 is made of a flexible material. The base end portion of the rod body 47 is internally fitted to the small diameter portion 45b of the support device 45, and is firmly joined to the small diameter portion 45b in the radial direction. The pipe axis direction L of the second connecting portion 43 is loosely fitted to the rod body 47.

As shown in FIGS. 6 and 8, the lid 48 is integrally formed with the side portion 48a joined so as to be fitted to the tip of the rod body 47 in the radial direction of the second connecting portion 43 at the end portion of the side portion 48a. It has a bottom portion 48b formed in. The bottom portion 48b is formed with a hole (reference numeral omitted) through which the second connecting portion 43 is loosely fitted. The second connecting portion 43 is internally fitted into the support member 49, and the support member 49 is crimped so that the second connecting portion 43 is inserted in the middle of the second connecting portion 43. It is integrated with the support member 49. The support member 49 is provided on the bottom portion 48b of the lid 48 so as to be able to take off and sit. The length of the rod body 47 in the pipe axis direction L is substantially the length of the pipe axis direction L of the hot water supply pipe 1 to be constructed.

With such a configuration, the rotation of the second handle 41 causes the other side spring seat 23b, the second connecting portion 43, the support member 49, and the one side spring seat 22b to rotate. Even if the second handle 41 rotates, the support device 45 and the rod body 47 rotate relative to each other (do not rotate).

When the screw 36a is screwed into the screw hole 36b at the radial center on the other side of the second cutting portion 26, the one-side spring seat 22b and the second cutting portion 26 are integrated, and the second connecting portion 43 rotates. , The second cutting portion 26 rotates. Further, the second connecting portion 43 is supported by the support member 49 from the other side spring seat 23b, and is supported by the one side spring seat 22b from the support member 49, and the support member 49 is supported in the middle portion of the second connecting portion 43. The portion leading to the one-side spring seat 22b is exposed. In the exposed second connecting portion 43, the support member 49 is provided on the bottom portion 48b of the lid 48 so as to be detachable and seatable, so that the second connecting portion 43 prevents the rod body 47 from retreating. It is in a state of being.

As shown in FIGS. 5 (a), (b) and (c) and FIG. 7, the outlet side device 29 inserted from the outlet 5 is provided. The outlet side device 29 includes a cord 31 and a joint 33. The joint 33 includes a joint body 50 that supports the cord 31 and a bearing 53 (rolling bearing). As shown in FIG. 7, the joint body 50 includes a support portion 51 for mounting the tip mounting portion 34 of the cord 31, and a rotating body mounting portion 52 having a large diameter with respect to the support portion 51. Both the support portion 51 and the rotating body mounting portion 52 are formed in a cylindrical shape. The outer diameter of the rotating body mounting portion 52 is formed to be smaller than the inner diameter φ1 of the hot water supply passage 10.

The tip mounting portion 34 is internally fitted into the support portion 51 and is crimped and integrated. A bearing 53 is arranged at the tip of the rotating body mounting portion 52 with the tip portion as an outer ring, and a rotating body 54 is arranged at the bearing 53 as an inner ring. Further, the screw member 53a on which the rotating body 54 is located is screwed from the inside of the rotating body 54 (inside the rotating body mounting portion 52). The rotating body 54 rotates about the axis of the bearing 53 (the axis of the tip mounting portion 34). The rotating body 54 includes a columnar rotor 54a formed at the tip thereof, and is screwed into a screw hole 40a formed on one side of the radial center of the second cutting portion 26.

The construction method of this cutting process will be described. First, as shown in FIG. 7, the operator prepares an outlet-side device 29, which is a joint 33 to which the tip mounting portion 34 of the cord 31 is attached, and shows this as shown in FIG. 5 (a). It is inserted from the outlet 5 toward the inlet 4 side of the hot water supply pipe 1. In this regard, since the outer diameter of the rotating body mounting portion 52 is formed to be smaller than the inner diameter φ1 of the hot water supply passage 10, the joint 33 can be inserted from the outlet 4 of the hot water supply pipe 1 to the inlet 4.

Further, the operator screwes the rotor 54a of the rotating body 54 into the screw hole 40a in the second cutting portion 26 of the inlet side device 28. Subsequently, in the flexible shaft 30 of the inlet side device 28, the screw 36a on the one side spring seat 22b side is screwed into the screw hole 36b of the second cutting portion 26. As a result, the inlet side device 28 and the exit side device 29 are integrated. Subsequently, the operator pulls the cord 31 from the outlet 5, and pulls a part of the second cutting portion 26, the second connecting portion 43, the support member 49, and the rod-shaped member 44 (rod body 47) of the inlet side device 28. It is inserted into the hot water supply channel 10 from the entrance 4 of the hot water supply channel 10.

At this time, since the inner diameter φ1 of the inlet processing region of the hot water supply passage 10 is cut to have an inner diameter φ2 by the inlet processing step, the second cutting portion 26 smoothly enters the hot water supply passage 10. Further, since the outer diameters of the one-side spring seat 22b and the second connecting portion 43 are smaller than the inner diameter φ1 of the hot water supply passage 10, they smoothly enter the hot water supply passage 10. Further, in the rod-shaped member 44, since the outer diameters of the lid 48 and the rod body 47 are set to be smaller than the inner diameter φ2, the hot water supply passage 10 can be smoothly entered.

When the second cutting portion 26 is inserted into the hot water supply passage 10, the second cutting portion 26 inserts up to the stepped surface 25 at the tip of the inlet processing region of the hot water supply passage 10 formed when the inlet processing step is completed. .. On such a stepped surface 25, the shape of the first cutting portion 12 is the same as the shape of the second cutting portion 26, so that the second cutting portion 26 can be easily positioned (see FIG. 5B).

After positioning the second cutting portion 26 with respect to the hot water supply passage 10 in this way, the traction portion 32 is prepared on the outlet 5 side, and the base end of the cord 31 towed by the traction portion 32 is wound around. Further, the tip of the power tool 14 is attached to the second handle 41. In this way, the traction portion 32 and the power tool 14 are driven, and the second cutting portion 26 starts cutting the inner diameter φ1 of the hot water supply path 10 after the stepped surface 25. The operator can easily grip the power tool 14 by gripping the support device 45 of the bearing device 42.

The second cutting portion 26, which is connected to the main body 17 of the power tool 14 via the second connecting portion 43, rotates about the pipe axis direction L as the rotation center and is pulled by the traction portion 32 via the cord 31. .. Further, the second handle 41 is supported by the electric tool 14, and the second connecting portion 43 is supported by the one-side spring seat 22b and the other-side spring seat 23b by caulking, in the other-side spring seat 23b and the second handle 41. Since it is joined to the internal region of the support device 45, the second cutting portion 26 rotates about the pipe axis direction L as the rotation center by the drive of the main body 17. Further, the rod-shaped member 44 serves as a guide, and the recoil when the second connecting portion 43 rotates can be suppressed.

When the second cutting portion 26 rotates, the second cutting blade 36 is guided by the second tapered surface 37, and the second large diameter is set to be larger than the second tapered surface 37 and smaller than the outer diameter φ3 of the hot water supply passage 10. The surface 38 cuts the hot water supply path 10 leaving an outer wall thickness (0.5 to 1.0 mm). At this time, the second large-diameter surface 38 is a blade portion in the shape of a key sheet cutter, and therefore the inner diameter of the hot water supply passage 10 is smoothly cut.

At the time of the main cutting step, the second cutting portion 26 may be pressed toward the outlet 5. However, since the second cutting portion 26 is inserted so as to be pulled from the outlet 5 instead of being pushed toward the outlet 5, the second cutting portion 26 can be easily moved. Then, the traction portion 32 pulls the second cutting portion 26 via the cord 31 extending forward (from the inlet 4 side to the exit 5 side) toward the outlet 5 side. That is, since the second cutting portion 26 is rotated around the pipe axis direction L and pulled from the outlet 5 for cutting, the second cutting portion 26 is pushed rather than pushed toward the outlet 5. It is easy to move to the outlet side, and the inner diameter φ1 of the hot water supply passage 10 can be surely scraped off.

In particular, since the cord 31 pulls the tip of the second cutting portion 26, the second cutting portion 26 is guided while changing the direction in which the cord 31 advances. Therefore, the second cutting portion 26 can be moved in the pipe axis direction L while reliably cutting the inner diameter.

By the way, the rotation of the second cutting portion 26 is prevented from being transmitted to the traction portion 32 by the joint 33. That is, the tip mounting portion 34 is crimped to the support portion 51 and integrated, but a bearing 53 is arranged at the tip of the rotating body mounting portion 52 with the tip portion as an outer ring, and the bearing 53 has an inner ring. The rotor 54 is provided with a rotor 54a at the tip so as to rotate about the axis of the bearing 53 (the axis of the tip mounting portion 34), and the rotor 54a is a second cutting portion. It is screwed into the screw hole 40a formed on one side of the radial center of 26. Therefore, the driving force of the electric tool 14 drives the second connecting portion 43 and the second cutting portion 26, but the bearing 53 rolls to rotate the cable 31 as the driving force of the electric tool 14. It is not affected by the rotation of the cord 31.

As shown in FIG. 5 (c), the traction portion 32 guides the second cutting portion 26 toward the outlet 5 via the cord 31, and when the second cutting portion 26 exits the outlet 5, the hot water supply path The inner diameter φ1 of 10 becomes the inner diameter φ2, and the diameter is expanded. Further, when the second cutting portion 26 exits from the outlet 5, the drive of the power tool 14 is stopped and the drive of the traction portion 32 is stopped. Then, the rotor 54a is removed from the screw hole 40a of the second cutting portion 26, the screw 36a formed on the one-side spring seat 22a side is removed, the screw hole 36b of the second cutting portion 26 is removed, and the inlet side device 28 is used. Pull to the entrance 4 side to finish the main cutting process.

Since the length of the rod body 47 in the pipe axis direction L is substantially the length of the pipe axis direction L of the hot water supply pipe 1 to be constructed, the support device 45 is inserted into the hot water supply passage 10 to be constructed. There is no need to insert from 4.

By the way, as shown in FIG. 8, it is common that a curved portion 55 is present in the middle of one hot water supply passage 10 (hot water supply pipe 1), and the entrance is also used during the main cutting process. The side device 28 is used.

FIG. 8 shows the situation of the pipe cutting device 27 (inlet side device 28, outlet side device 29) at the curved portion 55. When the hot water supply passage 10 has a curved portion 55 and the joint 33 is pulled by the cord 31, the outer diameter of the rotating body mounting portion 52 of the joint 33 is formed to be smaller than the inner diameter φ1 of the hot water supply passage 10. It is easy to insert the 33 into the curved portion 55. Further, the second connecting portion 43 has flexibility, and even if the support member 49 to the one-side spring seat 22b is exposed, the second connecting portion 43 is supported by the one-side spring seat 22b from the support member 49 and is supported. Since the member 49 is provided on the bottom portion 48b of the lid 48 so as to be removable and seatable, the second cutting portion 26 can be bent according to the traction of the joint 33 according to the curvature of the curved portion 55. Therefore, the drive of the second cutting portion 26 centered on the pipe axis direction L can be stably performed by the main body 17 of the power tool 14.

Further, since the tip of the second cutting portion 26 is pulled and guided by the cord body 31, the second cutting portion 26 advances while changing its direction so as to be pulled by the cord body 31 according to the curvature of the curved portion 55. Therefore, even if the second cutting portion 26 is on the curved portion 55, the inner diameter φ1 can be smoothly cut.

In the diameter expansion step, the first cutting portion 12 and the second cutting portion 26 cut so that the inner diameter φ1 of the hot water supply passage 10 becomes the inner diameter φ2 according to the outer diameter φ3 of the new pipe 11. Therefore, even if the curved portion 55 exists in the hot water supply passage 10 as well as the straight portion of the hot water supply passage 10, the thickness corresponding to the outer diameter φ3 of the new pipe 11 is cut off from the hot water supply passage 10.

[Cutting process]
Next, the cutting step of cutting the wall thickness in the pipe axis direction L in the hot water supply pipe 1 shown in (2) will be described. This cutting step is a step of cutting the wall thickness in the pipe axis direction L with respect to the hot water supply passage 10 whose inner diameter φ1 is set to the inner diameter φ2 by the diameter expansion step of the above (1). Here, with reference to FIGS. 9 to 12, the configuration of the pipe cutting device 56 for cutting the hot water supply passage 10 will be described.

As shown in FIGS. 9A and 9B, the pipe cutting device 56 includes a cord 31 and a traction portion 32, and a cutting portion 57 as shown in FIGS. 10A and 10B. Explaining the configuration of the cord 31 and the traction portion 32, the cord 31 and the traction portion 32 are the same as those used in the diameter expansion step. That is, a support 58a is provided in which the tip mounting portion 34 of the cord 31 is internally fitted and crimped. A screw 58b is provided at the tip of the support 58a toward the front.

As shown in FIG. 10A, the cutting portion 57 includes a guide portion 58, a support portion 59 arranged on the rear side of the guide portion 58, and a cutting blade 62 arranged outward from the support portion 59. Be prepared. As shown in the figure, the front end of the guide portion 58 has a truncated cone-shaped tapered surface 60 having a diameter smaller than the inner diameter φ2 of the hot water supply passage 10 and a rear end having a diameter smaller than the inner diameter φ2.

Further, a support portion 59 is integrally formed on the rear side of the guide portion 58, and the guide portion 58 and the tapered surface 60 are continuous. The maximum diameter of the tapered surface 60 is set to be slightly smaller than the inner diameter φ2 of the hot water supply passage 10. That is, the support surface 61 of the support portion 59 is also set to be slightly smaller than the inner diameter φ2 of the hot water supply passage 10. A screw hole 40b is formed at the tip of the guide portion 58 as a portion for attaching the screw 58b of the support 58a. Further, the outer diameter of the support 58a is equivalent to the minimum diameter of the tapered surface 60.

The cutting blade 62 has a height (blade height) in the radial direction larger than the wall thickness of the hot water supply passage 10, is arranged outward from the support portion 59, and the cutting blade 62 is pointed in the forward direction. The cutting blade 62 is embedded in the support portion 59 at the base of the cutting blade 62 for convenience of processing. The cutting blade 62 projects from the support surface 61 at only one place.

The construction method of the cutting process will be described. The operator prepares the traction portion 32 on the exit 5 side, unwinds the cord 31 in the traction portion 32, and inserts the cord 31 from the exit 5 toward the inlet 4. Further, the operator prepares the cutting portion 57 on the inlet 4 side, screwes the screw 58b of the support 58a crimped on the cord 31 into the screw hole 40b, and integrates the cutting portion 57 into the cord 31. (See FIGS. 9 (a) and 10 (a)).

Then, as shown in FIG. 10A, the cutting portion 57 is inserted into the inside of the hot water supply passage 10 via the cord 31 by driving the traction portion 32. At this time, since the front end of the guide portion 58 has a diameter smaller than the inner diameter φ2 of the hot water supply passage 10, the guide portion 58 smoothly enters the hot water supply passage 10. Further, the support surface 61 has a slightly smaller diameter than the inner diameter φ2 of the hot water supply path 10, and the support surface 61 enters the hot water supply path 10 by driving the traction portion 32. Since the cutting blade 62 has a larger radial direction than the wall thickness of the hot water supply passage 10 and is arranged outward from the support portion 59, the cutting blade 62 abuts on the inlet 4 of the hot water supply passage 10. The position of the cutting blade 62 at the end of the inlet 4 does not matter in which direction the hot water supply path 10 is located.

Further, when the traction portion 32 is driven and the cord 31 is towed, the cutting portion 57 enters the hot water supply passage 10 together with the support portion 59. As a result, the wall thickness of the hot water supply passage 10 is reduced by inserting the cutting blade 62, so that the hot water supply passage 10 is cut at both end faces 63 in the pipe axial direction L as shown in FIGS. ..

During the construction method of the cutting step, the inner diameter φ2 of the hot water supply passage 10 is guided by the tapered surface 60 in the guide portion 58 and supported by the support surface 61 of the support portion 59. The outer diameter of the support surface 61 is formed to be slightly smaller than the inner diameter φ2 of the hot water supply passage 10. Therefore, stability is maintained when the inner diameter φ2 of the hot water supply passage 10 is supported, and the cutting blade 62 can smoothly cut the wall thickness of the hot water supply passage 10. Even when the outer diameter of the support surface 61 is equal to or slightly larger than the inner diameter φ2, the inner diameter φ2 is slightly enlarged and supported by the cutting blade 62.

Moreover, the cord 31 is attached to the support 58a, and the guide portion 58 is inserted so as to be pulled from the outlet 5 via the cord 31 instead of being pushed toward the outlet 5. In this way, instead of pushing the tapered surface 60, the tip of the tapered surface 60 is pulled and guided by the cord 31, so that the tapered surface 60 of the guide portion 58 and the rear side of the guide portion 58 are provided. The work of moving the support surface 61 is easy.

The cutting blade 62 is set to have a larger radial direction than the wall thickness of the hot water supply passage 10, but the outer diameter of the hot water supply passage 10 is covered with a heat insulating material 9 (protective material). Further, even if the cutting blade 62 is set to be larger in the radial direction than the wall thickness of the hot water supply passage 10, the heat insulating material 9 is vulnerable to shearing in the pipe axial direction L. However, the heat insulating material 9 is prevented from being cut by the cutting blade 62 as much as possible. This is because if the heat insulating material 9 is cut by the cutting blade 62, the heat insulating material 9 itself needs to be reconstructed.

By the way, as shown in FIG. 11, there is a curved curved portion 55 in the middle of one hot water supply channel 10. However, even if the curved portion 55 is present, the guide portion 58 is inserted by pulling from the outlet 5 via the cord 31 instead of pushing toward the outlet 5, so that the guide portion 58 is guided by the support surface 61. With the inner diameter φ2 of the hot water supply passage 10 supported, the support surface 61 is easily moved along the pipe axis direction L by the cord 31. Therefore, it is easy to cut the wall thickness of the hot water supply passage 10 in the pipe axial direction L by the cutting blade 62 projecting outward from the outer surface of the support surface 61.

Further, since the tip of the cutting portion 57 is pulled by the cord 31, the cutting blade 57 is guided toward the outlet 5 so as to change its direction from the tip. Therefore, the cutting blade 57 can be easily moved.

[Insert process]
As shown in FIG. 13, in the insertion step, the inner diameter is changed from φ1 to φ2 by the diameter expansion step, and the new pipe 11 is pulled from the outlet 5 in a state where the wall thickness of the hot water supply passage 10 is cut by the cutting step. It is a construction to insert. A pipe inserter 64 is used in this insertion step. The pipe insertion tool 64 inserts the new pipe 11 into the hot water supply passage 10 so that the inner diameter φ2 of the hot water supply passage 10 from the inlet 4 to the outlet 5 of the hot water supply passage 10 is inserted into the hot water supply passage 10 according to the outer diameter φ3 of the flexible new pipe 11. Used. As described above, the new pipe 11 is formed of a cross-linked polyethylene pipe, a polybutene pipe, a flexible metal pipe, or the like, and is a flexible pipe. Further, in the new pipe 11, the outer diameter φ3 is set to 13 mm and the inner diameter φ1 is set to 10 mm.

The pipe inserter 64 will be described in detail with reference to FIGS. 13 to 17. As shown in FIG. 13, the pipe insertion tool 64 includes an insertion portion 65 and a cord 31. A traction unit 32 is provided as a device for traction of the cord 31. Explaining the configuration of the cord 31 and the traction portion 32, the cord 31 and the traction portion 32 are the same as those used in the diameter expansion step.

The insertion portion 65 of the pipe insertion tool 64 is connected to the tip end 11a of the new pipe 11, and is connected to a joint having the same or larger diameter as the outer diameter φ3 of the new pipe 11, that is, the relay member 66 and the rear end portion of the relay member 66. The new pipe 11 is provided with a holding portion 11a into which the tip end 11a is inserted to prevent the new pipe 11 from bulging in the out-of-diameter direction, that is, a holding portion 67.

As shown in FIG. 15, the relay member 66 includes a front cylinder body 68 on the distal end side and a rear cylinder body 69 arranged on the rear side of the front cylinder body 68. Further, the relay member 66 includes a presser ring 74. The front cylindrical body 68 is provided with an enlarged piece 70 along the tube axis direction L on the surface, and the enlarged piece 70 is formed at predetermined intervals in the circumferential direction of the cylindrical surface 71. The middle of the enlarged pieces 70 is a cylindrical surface 71 having a diameter smaller than that of the enlarged pieces 70. Further, the front and back of each enlarged piece 70 are formed on an arc surface. The outer diameter of the enlarged piece 70 is the same as the inner diameter φ2 of the cut hot water supply passage 10. A screw hole 40c for screwing the screw 65b of the support 65a, which will be described later, is passed through the radial center of the front cylindrical body 68.

The rear cylinder 69 is formed to have a smaller diameter than the front cylinder 68. The rear cylinder 69 is formed in a tubular shape. The inner space portion of the rear cylinder 69 is communicated with the screw hole 40c. The rear cylindrical body 69 is arranged by arranging a plurality of cylindrical pieces 72 in the circumferential direction and at predetermined intervals in the circumferential direction. At the rear end of each cylindrical piece 72, a blocking piece 73 projecting outward in the radial direction is formed along the circumferential direction of the cylindrical piece 72. A plurality of the blocking pieces 73 are arranged along the pipe axis direction L.

The relay member 66 includes a presser ring 74. The rear cylinder 69 and the presser ring 74 form the presser portion 67 into which the tip 11a of the new pipe 11 is inserted to prevent the new pipe 11 from bulging in the out-of-diameter direction. The presser ring 74 is a cylindrical cylinder (or a half-split cylinder), and the outer diameter of the presser ring 74 is outside the enlarged piece 70 of the front cylindrical body 68 when the tip 11a of the new pipe 11 is pressed. It is the same as the diameter. The end of the new pipe 11 is held by locking the inner circumference of the presser ring 74 and the outer circumference of the blocking piece 73.

As shown in FIG. 14, the pipe inserter 64 has a support 65a. The support 65a is integrated with the support 65a and the tip mounting portion 34 by internally fitting and crimping the tip mounting portion 34 of the cord 31. On the tip end side of the support 65a, a conical base surface 65c whose outer circumference gradually increases toward the rear is formed. The maximum diameter of the conical base surface 65c is slightly smaller than that of the enlarged piece 70. Behind the conical base surface 65c, a screw 65b screwed into a screw hole 40c arranged in the radial center of the front cylindrical body 68 is formed.

The construction method of the insertion process will be described. The operator prepares the traction portion 32 on the outlet 5 side, and inserts the support 65a to which the cord 31 is attached from the outlet 5 toward the inlet 4. Further, the operator prepares a new pipe 11 having the tip 11a locked to the relay member 66 on the inlet 4 side. The tip 11a of the new pipe 11 inserts the inner diameter of the new pipe 11 into the rear cylindrical body 69, and the tip 11a of the new pipe 11 is inserted by the presser ring 74.

Then, of the support 65a to which the tip mounting portion 34 of the cord 31 is attached to the screw hole 40c of the front cylindrical body 68, the screw 65b is screwed to connect the relay member 66 and the support 65a (FIG. 13 (a)). Next, the operator drives the towing portion 32 to pull the cord 31, so that the front cylindrical body 68 is inserted from the inlet 4 of the hot water supply passage 10. At this time, the peripheral surface of the conical base surface 65c serves as a guide for smoothly inserting the front cylindrical body 68. Here, the front cylindrical body 68 has an enlarged piece 70, and its outer diameter is the same as the inner diameter φ2 of the cut hot water supply passage 10. However, the enlarged piece 70 is intermittently arranged in the circumferential direction with respect to the cylindrical surface 71, and the front and back of the enlarged piece 70 are formed on an arcuate surface. Therefore, the front cylindrical body 68 is smoothly inserted into the hot water supply passage 10.

Moreover, by the cutting step, a part of the wall thickness (inner diameter φ2) of the hot water supply passage 10 is cut by both end faces 63 in the pipe axial direction L. Therefore, since the diameter of the part between the ends of the hot water supply passage 10 may be expanded by the relay member 66, the insertion of the relay member 66 in the hot water supply passage 10 becomes smoother.

Further, since the relay member 66 is towed by the traction unit 32 instead of being pushed toward the outlet 5, the relay member 66 can be easily moved toward the outlet 5 rather than pushing the relay member 66 toward the outlet 5. Easy to make. Then, when the new pipe 11 is inserted into the hot water supply passage 10, the relay member 66 for the new pipe 11 is removed, and the screw hole 40c of the front cylindrical body 68 and the screw 65b of the support 65a are unscrewed and inserted. The construction method of the process is completed (FIG. 13 (b)).

By the way, as shown in FIG. 17, there is a curved curved portion 55 in the middle of one hot water supply channel 10. Further, in the curved portion 55, the hot water supply passage 10 is distorted and distorted. However, even in the curved portion 55, since the end face 63 cut in the pipe axial direction L of the hot water supply passage 10 is opened by inserting the new pipe 11, the hot water supply passage is inserted by inserting the new pipe 11 by pulling the cord 31. The distorted portion of 10 is corrected, and the relay member 66 is inserted so as to proceed along the hot water supply passage 10 while changing the posture along the curved portion 55. Therefore, even if the relay member 66 and the new pipe 11 following the relay member 66 are smoothly inserted into the hot water supply passage 10 and the curved portion 55 exists in the hot water supply passage 10, the relay member 66 and the new pipe 11 do not get caught in the curved portion 55. Can be inserted smoothly.

Further, since the tip of the relay member 66 is pulled by the cord 31, the relay member 66 is guided to change its direction from the tip, so that the relay member 66 can be easily moved.

In the relay member 66, the tip 11a of the inner diameter of the new pipe 11 is pressed (locked) by the blocking piece 73 of the rear cylindrical body 69, and the tip 11a is externally fitted by the pressing ring 74, so that the new pipe 11 is fitted. A holding portion 67 for preventing the tip 11a from bulging in the outer diameter direction is configured. Therefore, the holding portion 67 prevents the new pipe 11 from swelling, and the new pipe 11 is inserted along the straight portion and the curved portion 55 of the hot water supply passage 10. That is, by preventing the new pipe 11 from swelling, the new pipe 11 does not get clogged in the hot water supply passage 10, so that the new pipe 11 can be smoothly inserted into the hot water supply passage 10.

In the construction method according to the present embodiment, in the diameter expansion step, the inner diameter φ1 of the hot water supply pipe 1 from the inlet 4 to the outlet 5 in the pipe axial direction L is set to the first cutting portion 12 according to the outer diameter φ3 of the new pipe 11. In the cutting step, the wall thickness in the pipe axis direction L in the hot water supply path 10 is cut, and in the insertion step, the new pipe 11 is inserted into the hot water supply path 10 whose inner diameter is φ2 by the diameter expansion step. , Pull and insert from outlet 5.

According to this method, the hot water supply pipe 1 is firmly fixed to a slab 3a or the like arranged under the floor surface 3 at predetermined intervals in the pipe axis direction L, for example, in a hot water supply step. The inlet 4 of the pipe 1 is removed from the header member 6, the outlet 5 is removed from the faucet 7 in the bathroom, and in the insertion step, the new pipe 11 is pulled from the outlet 5 and inserted. Therefore, even if the hot water supply pipe 1 is firmly fixed, the construction can be simplified without peeling off the floor surface in the house, and the construction of the new pipe 11 can be easily performed.

In the cutting step, since the wall thickness of the hot water supply passage 10 in the pipe axis direction L is cut, the new pipe 11 can be smoothly inserted even if the inner diameter φ1 of the hot water supply passage 10 and the outer diameter of the new pipe 11 are the same. Construction can be simplified by the amount.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. In addition, the specific configuration of each part is not limited to the above embodiment.

For example, another configuration of the pipe cutting device 27 will be described. As shown in FIG. 18, the pipe cutting device 27 includes an inlet side device 28 inserted from the inlet 4 and an outlet side device 29 inserted from the outlet 5. It is shown in FIGS. 5 to 5 that the inlet side device 28 includes a flexible shaft 30 and a second cutting portion 26 provided at the tip of the flexible shaft 30, and the outlet side device 29 includes a cord 31 and a joint 33. It is the same as the embodiment shown in 8. Further, as a device for driving the second cutting portion 26, an electric tool 14 (see FIG. 3) is provided.

The outer shape of the second cutting portion 26 has the same configuration as that of the first cutting portion 12 (see FIG. 4) in the inlet machining apparatus 13, and the screw 36a of the flexible shaft 30 is provided on the other side of the second cutting portion 26. A screw hole 36b to be screwed and a support space 40d for mounting the joint 33 are formed on one side, and the screw hole 36b and the support space 40d are communicated with each other in the axial direction of the second cutting portion 26. ..

In this embodiment, the configuration of the joint 33 is particularly different. The joint 33 includes a joint body 80 and mounting screws 81. The joint body 80 is formed in a columnar shape, and the tip mounting portion 34 of the cord 31 is internally fitted to one end thereof, and is mounted and integrated by caulking. Further, a screw hole 82 is formed at the other end of the joint body 80.

The mounting screw 81 includes a body portion 83 and a countersunk portion 84, and the body portion 83 of the mounting screw 81 is inserted into the support space 40d formed in the second cutting portion 26 from the other side, and the screw hole of the joint body 80 is inserted. It is attached to 82. The screw hole 82 of the joint body 80 is screwed into the body portion 83. On the other hand, the support space 40d formed in the second cutting portion 26 is loosely fitted in the body portion 83. Other configurations are the same as those of the embodiments shown in FIGS. 5 to 8.

In the main cutting step according to the above embodiment shown in FIG. 18, the joint body 80 to which the tip attachment portion 34 of the cord 31 is internally fitted and attached by caulking is inserted into the inlet 4 from the outlet 5 to the inlet 4 side. The second cutting portion 26 is attached to the joint body 80. At this time, the body portion 83 of the mounting screw 81 is screwed into the screw hole 82 of the joint body 80, and the support space 40d formed in the second cutting portion 26 is loosely fitted into the body portion 83. Further, the screw 36a of the flexible shaft 30 is screwed into the screw hole 36b.

When the power tool 14 is driven, the screw 36a and the second cutting portion 26 of the flexible shaft 30 rotate around the center in the pipe axis direction L as described above. However, the body portion 83 of the mounting screw 81 is screwed into the screw hole 82 of the joint body 80, but the support space 40d formed in the second cutting portion 26 is loosely fitted into the body portion 83. Due to such a joint 33, the rotation of the second cutting portion 26 is prevented from being transmitted to the joint body 80 and the cord 31 by the joint 33.

In the removal step of the above embodiment, the case where the inlet 4 of the hot water supply pipe 1 is connected to the water heater via the header member 6 and the outlet 5 is connected to the faucet 7 of the bathroom is illustrated. The above-mentioned construction method and device can also be used in other water supply pipes, for example, water supply pipes and hot water supply pipes in a kitchen. Further, even if the curved portion 55 of the hot water supply passage 10 has a curved portion in the vertical direction or has a curved portion in the horizontal direction, the construction can be simplified and the construction of the new pipe 11 can be easily performed. .. Further, in the above embodiment, although the heat insulating material 9 is externally fitted in the hot water supply passage 10 in the hot water supply pipe 1, a protective material may be used instead of the heat insulating material 9.

In the above embodiment, the inlet processing step may be omitted and the main cutting step may be carried out from the removal step. Further, in the inlet processing step and the main cutting step, the first connecting portion 16 and the second connecting portion 43 are composed of torsion coil springs, but they can also be long elastic members extending in the pipe axis direction L. be.

In the construction method of the above embodiment, the case where the outlet 5 is exposed from the floor surface 3 from the inlet 4 and the hot water supply pipe 1 is provided under the floor 3 is exemplified. However, the above-mentioned construction method and the equipment used for the construction method can also be applied to the ceiling piping provided on the back surface of the ceiling of a house or the like.

The form of the joint 33 used in the main cutting step is not particularly limited as long as it does not transmit the rotation of the rotating body 54 to the cord 31, and the support portion 51 and the rotating body mounting portion 52 have the same diameter. You can also do it.

The cutting blade 62 of the pipe cutting device 56 used in the cutting step may be formed at any position protruding from the support portion 59, or may be formed at two or more locations on the support portion 59. In this case, the wall thickness of the hot water supply passage 10 is cut in the pipe axis direction L at the place where the cutting blade 62 is located.

As for the outer diameter of the cutting portion 57 of the pipe cutting device 56 used in the cutting step, the maximum diameter of the tapered surface 60 (diameter of the support surface 61) is set to be smaller than the inner diameter φ2 of the hot water supply passage 10. However, the maximum diameter of the tapered surface 60 can be set larger than the inner diameter φ2. Further, the maximum diameter of the tapered surface 60 can be set to be equivalent to the inner diameter φ2. By setting the maximum diameter of the tapered surface 60 (diameter of the support surface 61) to be larger than the inner diameter φ2, or by setting the maximum diameter of the tapered surface 60 to be equal to the inner diameter φ2, the hot water supply path 10 by the cutting blade 62 can be used. The inner diameter φ2 is easily held.

Although the enlarged piece 70 is formed on the relay member 66 used in the insertion step of the present embodiment, the enlarged piece 70 may be omitted to form a cylindrical surface 71 having an outer diameter of the enlarged piece 70. A plurality of blocking pieces 73 in the holding portion 67 are provided in the pipe axial direction L, but the number is not limited to this. Further, instead of providing the blocking pieces 73, a friction surface is used, and the friction surface and the holding ring 74 are used for new piping. The tip 11a of 11 can be pressed down.

In the above embodiment, a new pipe 11 having the same outer diameter and inner diameter is inserted into the hot water supply passage 10. However, new pipes 11 having different outer diameters and inner diameters can be inserted into the hot water supply passage 10.

In this embodiment, the present construction method and the apparatus are exemplified for the hot water supply passage 10. However, this construction method and equipment can also be used for pipes to which sewage, gas, oil, etc. are supplied.

The case where the hot water supply pipe 1 is formed by inserting a hot water supply passage 10 such as a cross-linked polyethylene pipe, a polybutene pipe, or an aluminum three-layer pipe into a heat insulating material 9 is exemplified, but the hot water supply pipe 1 is formed of a hard synthetic resin. There may be.

In the embodiment, the construction including the removal step, the inlet processing step, and the cutting step has been described, but the present invention is not limited to this, and at least one of these steps may be omitted.

In the present embodiment, the case where the first cutting portion is rotated in the inlet machining process and the second cutting portion is rotated in the main cutting process to cut is described, but the present invention is not limited to this, and the case where the cutting portion is slid in the pipe axis direction to cut. Alternatively, it may be melted and scraped.

In the present embodiment, the case of cutting at the second cutting portion has been described in the main cutting step, but the present invention is not limited to this, and the cutting blade having a small cutting diameter is cut on the tip side and the cutting portion having a large cutting diameter is cut on the tip side. It may be provided on the rear end side of the portion and cut in two steps.

In the present embodiment, the case where the main cutting step pulls the second cutting portion 26 from the outlet 5 side with the cord 31 to move the inside of the existing pipe is described, but the second cutting portion 26 is not limited to this. It may be moved by pushing from the entrance 4 side to the exit 5 side. Further, the second cutting portion 26 can be applied to the main cutting step even if it is towed from the outlet 5 side to the inlet 4 side (the form in which the inlet 4 and the outlet 5 are reversed), and the main cutting step can also be applied to the steps other than the main cutting step. Applicable.

In the present embodiment, the case where the main cutting process arranges the power tool on the inlet side and the traction portion on the outlet side has been described, but the present invention is not limited to this, and the power tool and the traction portion are arranged on the outlet side. , The second cutting portion may be moved from the outlet side while being driven by cutting.

In the present embodiment, the case where the cutting step pulls and moves the cutting tool from the outlet side has been described, but the present invention is not limited to this, and the cutting tool may be pushed from the inlet side.

In the present embodiment, the case where the cutting step and the inserting step are separate steps has been described, but the present invention is not limited to this, and the cutting step and the inserting step may be one step. In that case, a new pipe is connected to the rear side of the cutting process.

In the present embodiment, the case where the main cutting step and the cutting step are separate steps has been described, but the present invention is not limited to this, and the main cutting step and the cutting step may be one step.

In the present embodiment, the case where the cutting step is cutting with a blade has been described, but the cutting step may be the case of cutting with heat.

In the present embodiment, the insertion step has described the case of pulling from the outlet side, but the insertion step may be a case of pushing in in addition to pulling. It is also possible to insert the new pipe while rotating it.

In the pipe cutting device of the present embodiment, the case where the inlet side device is pulled toward the outlet side has been described, but the present invention is not limited to this, and the device may be a device that pulls the inlet side device toward the inlet side.

The case where the cutting portion (pipe cutting device) of the present embodiment is pulled toward the outlet side has been described, but the cutting portion is not limited to this, and a pushing member may be arranged and pushed toward the outlet side.

Further, in the main cutting step, as shown in FIG. 19C, when the hot water supply path 10 is cut, the dust (kiriko) generated by the hot water supply path 10 is directed from the inlet 4 to the outlet 5 or from the outlet 5 to the inlet 4. A removing means 85 for removing the water can be provided. The removing means 85 has a function of blowing dust generated by cutting the hot water supply path 10 from the inlet 4 to the outlet 5 or from the outlet 5 to the inlet 4.

For example, in FIG. 19 (c), the removing means 85 can be provided as a device incidental to the inlet 4. The removing means 85 includes a pipe-side joint 86, a rod-side joint 87, and an air inhaler 88.

The pipe-side joint 86 fits into the outer diameter of the hot water supply passage 10 protruding from the heat insulating material 9. As shown in FIGS. 19A and 19B, the pipe side joint 86 includes a nut member 89 that fits into the outer diameter of the hot water supply path 10, and a nut member 89 and the nut member 89 from the open side of the hot water supply path 10 in the nut member 89. A pipe insertion portion 90 screwed into the outer diameter of the hot water supply passage 10 is provided. A chuck ring 91 is arranged on the inner surface of the nut member 89 and the tip of the pipe insertion portion 90. A sealing device (O-ring) 92 for sealing the outer peripheral surface of the hot water supply passage 10 is provided on the inner peripheral surface of the tip end portion of the pipe insertion portion 90. The rod-side joint 87 is formed in a tubular shape, is slidably fitted to the lid 48 and the rod body 47, and is provided with a packing 93 on the inner peripheral surface.

As shown in FIG. 19 (c), the air inhaler 88 has a semi-divided and cylindrical fixed portion 94, 94 separated in the radial direction, and one fixed portion 94 outside the diameter from the middle of the pipe axial direction L. It is provided with a suction portion 95 that protrudes in the direction and is screwed to one of the fixing portions 94. Further, a sealing device (O-ring) 92 for sealing the inner peripheral surfaces of the fixing portions 94 and 94 is provided on the outer peripheral surface of the rear end portion of the pipe insertion portion 90 and the outer peripheral surface of the rod-side joint 87. The suction portion 95 is formed in a cylindrical shape. Further, the half-split fixing portions 94 and 94 are fixed to each other by being screwed to each other.

When the inner diameter φ1 of the hot water supply passage 10 is cut to the inner diameter φ2 in the main cutting step, dust (cut pieces) of the hot water supply passage 10 is generated as the inner diameter φ2 of the hot water supply passage 10 is cut. The removing means 85 is effective when the dust becomes an obstacle and interferes with the subsequent process.

In the removing means 85 having the above configuration, as shown in FIG. 19A, the nut member 89 and the pipe insertion portion 90 with the chuck ring 91 are assembled in advance and fitted to the outer diameter of the hot water supply passage 10. By doing so, the pipe side joint 86 is brought into close contact with the outer diameter of the hot water supply passage 10 by the chuck ring 91, and the rear end portion of the pipe insertion portion 90 protrudes from the hot water supply passage 10. When the rod-side joint 87 is arranged so as to be fitted onto the lid 48 of the inlet-side device 28, the packing 93 provided on the inner peripheral surface is in close contact with the lid 48.

In this state, as shown in FIG. 19B, the second cutting portion 26 is inserted into the hot water supply passage 10, and the fixing portions 94 and 94 are fitted to the pipe side joint 86 and the rod side joint 87. Then, the half-split fixing portions 94 and 94 are screwed to each other. The suction portion 95 is screwed into one of the fixing portions 94. As a result, the internal space of the suction unit 95 and the internal space of the fixed portions 94, 94 communicate with each other, and the internal space of the suction unit 95 and the internal space of the fixed portions 94, 94 communicate with the internal space of the hot water supply passage 10. ..

The rod-side joint 87 is initially in close contact with the lid 48, but a packing 93 is provided on the inner peripheral surface of the rod-side joint 87, and the rod-side joint 87 slides on the lid 48 and the rod body 47. Since the outer fitting is movably fitted, even if the second cutting portion 26 is inserted toward the outlet 5, the rod body 47 can move the rod side joint 87, and the packing 93 is also in close contact with the rod body 47. do.

By connecting the internal space of the suction unit 95, the internal space of the fixed portions 94, 94, and the internal space of the hot water supply passage 10, for example, by connecting a compressor (compressor or the like) to the suction unit 95, the suction unit 95 can be connected. Air can be sent into the internal space and air can be sent into the internal space of the hot water supply channel 10.

Therefore, in the main cutting process, when the inner diameter φ1 of the hot water supply passage 10 is cut to the inner diameter φ2, dust (cut pieces) of the hot water supply passage 10 is generated due to the cutting of the inner diameter φ2 of the hot water supply passage 10. Air can be sent into the internal space of 10 to remove dust, for example, from the inlet 4 to the outlet 5.

If the cord 31 and the traction portion 32 interfere with the removal of dust, the joint 33, the cord 31 and the traction portion 32 can be omitted. Therefore, the second cutting portion 26 can be moved by pushing it from the inlet 4 side to the outlet 5 side.

The piping construction method in the above embodiment has shifted from the removal process to the inlet processing process. However, in the middle of the removal step to the inlet processing step, a curved portion straightening step for correcting a state in which the curved portion 55 of the hot water supply passage 10 is distorted can be included. In this case, the curved portion straightening device is inserted from the inlet 4 or the outlet 5 of the hot water supply passage 10 in the pipe axial direction L of the hot water supply passage 10.

As shown in FIG. 20, the curved portion straightening device 96 is provided with a tapered surface portion 97 at one end so that it can be inserted into the inlet 4 or the outlet 5, and the outer diameter is substantially equal to the inner diameter φ1 of the hot water supply passage 10 at the other end. The straightening portion 98 made of the formed cylindrical body is arranged. By passing the straightening portion 98 through the inner diameter φ1 of the hot water supply passage 10, the strain of the curved portion 55 of the hot water supply passage 10 is corrected. Further, the bending portion correcting device 96 is towed to the inlet 4 or the outlet 5 side by using the cord 31 and the traction portion 32.

Specifically, the bending portion straightening device 96 is connected to the rotor 54a of the joint 33, so that the bending portion straightening device 96 is towed without rotating. This is because if the bending portion is pulled without being rotated, the bending portion correcting device 96 is stable, so that the distortion can be easily corrected.

If the tapered surface portion 97 comes to the tip of the curved portion straightening device 96, the curved portion straightening device 96 may be pushed in the pipe axial direction L from the inlet 4 or the outlet 5 by using a flexible rod-shaped member. The curved portion straightening device 96 may include only the straightening portion 98 without including the tapered surface portion 97.

The curved portion straightening device 96 was provided as a construction method during the process of removing and processing the inlet. However, for example, in the main cutting step in FIG. 8, a curved portion correction device 96 may be provided in the middle of the cord 31, and the main cutting step may be performed so as to also correct the distortion of the curved portion 55.

By the way, in the pipe construction method of the present invention, it is also possible to use the straightening portion 98 and the removing means 85 as described above. The second cutting portion 26 cuts the inner diameter φ1 of the hot water supply path 10 to the inner diameter φ2, and the second cutting portion 26 advances in the pipe axis direction L. Therefore, the second cutting portion 26 When the number of the second cutting blade 36 (the tip blade surface of the second large diameter surface 38) is as small as possible, the frictional resistance with the hot water supply path 10 can be reduced.

The second cutting portion 26 is not limited to being formed as a key sheet cutter-shaped blade portion on the outer periphery of the second blade surface 35, and is as small as possible within the range in which the inner diameter of the hot water supply path 10 can be cut. Can be. For example, in the above embodiment, the second cutting portion 26 is composed of a second blade surface 35 and a plurality of second cutting blades 36. Of these, the second cutting blade 36 may be formed in pairs in the radial direction, and the other second cutting blade 36 may be omitted. The surface area of the second cutting blade 36 can be reduced and the frictional resistance with the hot water supply path 10 can be reduced by the amount that the other second cutting blade 36 is omitted.

Then, if the distortion of the hot water supply passage 10 is corrected by the straightening portion 98, not only the hot water supply passage 10 is a straight portion but also the distortion of the curved portion 55 is corrected, and the second cutting portion 26 becomes the curved portion 55. It is inserted smoothly. Moreover, the friction between the second blade surface 35 of the second cutting blade 36 and the dust can be reduced by blowing the dust generated from the hot water supply passage 10 forward by the air of the removing means 85. In addition, the air cooling action by air can suppress the frictional heat between the second cutting blade 36 (second blade surface 35) and the hot water supply path 10 as much as possible, and prevent the dust from melting and sticking to the second cutting blade 36. Therefore, the cutting resistance of the second cutting portion 26 with respect to the hot water supply path 10 is suppressed. Therefore, the rotational torque of the second cutting portion 26 is suppressed, and when the second cutting blade 36 is rotated, the second cutting blade 36 is smoothly rotated inside the hot water supply passage 10. Further, the load on the flexible second connecting portion 43 following the second cutting blade 36 can be reduced, and the second connecting portion 43 can be stabilized.

1 ... hot water supply pipe, 4 ... inlet, 5 ... outlet, 6 ... header member, 7 ... faucet, 9 ... heat insulating material, 10 ... hot water supply passage, 11 ... new pipe, 11a ... tip, 12 ... first cutting part, 13 ... entrance processing device, 14 ... electric tool, 15 ... first handle, 16 ... first connecting part, 17 ... main body, 18 ... first cutting edge, 19 ... first cutting blade, 20 ... first tapered surface, 21 ... first Large diameter surface, 25 ... stepped surface, 26 ... second cutting part, 27 ... pipe cutting device, 28 ... inlet side device, 30 ... flexible shaft, 31 ... cable body, 32 ... traction part, 33 ... joint, 34 ... Tip mounting part, 35 ... second blade surface, 36 ... second cutting blade, 37 ... second tapered surface, 38 ... second large diameter surface, 41 ... second handle, 42 ... bearing device, 43 ... second connection Part, 44 ... rod-shaped member, 45 ... support device, 49 ... support member, 50 ... joint body, 51 ... support part, 52 ... rotating body mounting part, 53 ... bearing, 54 ... rotating body, 55 ... curved part, 56 ... Piping cutting device, 57 ... Cutting part, 58 ... Guide part, 59 ... Support part, 60 ... Tapered surface, 61 ... Support surface, 62 ... Cutting blade, 63 ... End face, 64 ... Piping inserter, 65 ... Inserting part, 66 ... Relay member, 67 ... Presser, 68 ... Front cylinder, 69 ... Rear cylinder, 70 ... Enlarged piece, 71 ... Cylindrical surface, 72 ... Cylindrical piece, 73 ... Blocking piece, 74 ... Presser ring, L ... Pipe Axial direction, φ1 ... inner diameter, φ2 ... inner diameter, φ3 ... outer diameter

Claims (2)

A pipe cutting device that cuts the supply pipe in the pipe axis direction in a pipe formed by inserting a tubular supply pipe through a protective material.
A tapered surface whose front end is smaller than the inner diameter of the supply pipe and is enlarged toward the rear side, a cylindrical surface arranged on the rear side of the tapered surface, and a cutting blade arranged only on the cylindrical surface. Equipped with
The height of the cutting blade is set higher than the wall thickness of the supply pipe.
A pipe cutting device characterized in that the outer diameter of the cylindrical surface, the maximum outer diameter of the tapered surface , and the outer diameter of the cylindrical surface are configured to be larger than the inner diameter of the supply pipe. The pipe cutting device according to claim 1, further comprising a cord for pulling the tapered surface from the outlet of the pipe.

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