JP3666815B2 - Existing pipe cutting tool and existing pipe drawing tool - Google Patents

Description

The present invention relates to a cutting tool for an existing pipe, and a drawing tool for an existing pipe, which are preferably used when an existing pipe for drawing a water pipe buried in the ground is replaced with a new pipe.

  Conventionally, when renewing existing pipes that are buried underground, such as for water supply and drawing in, the road where the main pipes and lead-in pipes are buried is dug all over, and along the laying route The most common method of construction is to expose the main pipe and the lead-in pipe (existing pipe) in the ground, then remove the existing pipe and lay a new pipe. However, digging all the existing pipes along the laying route is a result of the necessity of blocking traffic, road re-paving work, back-filling work, etc. However, there are many disadvantages such as an increase in cost required for construction and a lot of time. In addition, when existing pipes are buried in a paved road, pavement waste (industrial waste) is generated by the excavation work, and there is a risk of environmental destruction due to the disposal.

Therefore, for the purpose of minimizing the excavation work, a pipe laying method and a pipe splitter described in Japanese Patent Laid-Open No. 11-2362 have been proposed. The pipe splitter described in the publication includes a cutter that cuts existing pipes such as vinyl chloride pipes and polyethylene pipes in the longitudinal direction, and an expander that expands the cut existing pipes in the radial direction. When using this pipe splitter, open both ends of the existing pipe, insert the pipe splitter into the existing pipe, and propel it with the wire. ) And lay the new pipe inside the existing pipe while expanding the cut existing pipe with an expander.
Japanese Patent Laid-Open No. 11-2362

  However, the pipe splitter described in the aforementioned Japanese Patent Application Laid-Open No. 11-2362 is provided with a plurality of cutters made of roller blades, and the existing pipe is propelled along the installation path while cutting the existing pipe in the longitudinal direction. Perform construction. At that time, the cutter is in a state where the tip portion protrudes from the surface of the existing pipe, to other buried objects buried in the vicinity of the existing pipe, for example, a gas pipe, a kerosene lead-in pipe, and load heating. There was a risk of damaging the wiring and the like with the cutter. In addition, in the pipe laying method using this pipe splitter, there is a problem that the existing pipe that has become unnecessary remains in the ground because the existing pipe is replaced with a new pipe without being removed.

  The present invention has been proposed to cope with such various situations. When an existing pipe is replaced with a new pipe, the excavation work on a road or the like is minimized, and the surrounding area of the existing pipe is reduced. An object of the present invention is to provide an existing pipe cutting tool and an existing pipe pulling tool capable of removing existing pipes without damaging other buried objects embedded in the pipe.

  In order to achieve the above object, the invention according to claim 1 includes a cutter that cuts an existing pipe in the axial direction of the pipe by moving along with the wire while passing the wire through the existing pipe buried in the ground. In the cutting tool, an outer tube that is formed in a cylindrical shape and has a tapered tip is disposed through the wire, and the outer tube has an inner diameter that allows an existing tube to be inserted therein to be inserted therein. And the existing pipe is cut by the cutter inside the outer tube.

  The invention according to claim 2 is characterized in that, in the above (1), the cutter is joined to the inner wall surface of the outer tube.

  According to a third aspect of the present invention, in the first or second aspect, the outer tube is composed of a tapered tip portion and a cylindrical portion detachably provided at the tip portion. Features.

  According to a fourth aspect of the present invention, in the first to third aspects, a guide member in which both ends in the propulsion direction of the wire and the opposite direction are tapered is attached to the rear portion of the cutter. To do.

  According to a fifth aspect of the present invention, in the first to fourth aspects, a tubular flexible sleeve for accommodating the existing pipe cut by the cutter is attached to the rear part of the outer tube, and the existing pipe is cut. Later, the cut existing pipe is removed together with the sleeve from the ground.

  The invention according to claim 6 is a case where existing pipes are connected to each other through a joint, and an engagement member that engages with the joint is provided on a wire that is inserted into the existing pipe that is embedded. It is characterized by becoming.

  The invention according to claim 7 is the above (6), wherein the engaging member is provided with a claw portion that engages with the joint, and the engaging member connects the wire in the drawing direction of the existing pipe. The taper portion of the expanding member that is fixedly attached to the wire is configured to push and expand the claw portion in the radial direction of the existing pipe by being fitted inside the engaging member when pulled. Features.

  As described above, according to the first aspect of the present invention, since the existing pipe is cut by the cutter disposed in the outer tube, other buried objects around the existing pipe to be updated For example, it is possible to prevent the gas pipe, the kerosene lead-in pipe, the load heating wiring and the like from being damaged by the cutter.

  As described above, according to the invention of claim 2, by welding the cutter to the inner wall surface of the mantle tube, when the existing tube is cut, it is possible to prevent erratic movement such as shaking of the cutter, It is possible to prevent the cutter from being chipped when the existing pipe is cut.

  As described above, according to the third aspect of the present invention, the outer tube is divided into the tip portion and the cylindrical portion to ensure a certain length, so that when the existing tube is cut, It is possible to prevent mud and soil from entering.

  As described above, according to the invention described in claim 4, since the guide member is attached to the rear portion of the cutter, the wire is pulled in the cutting direction of the existing pipe, for example, when the existing pipes are connected by the joint. When the wire needs to be pulled back in the opposite direction, such as when it becomes impossible, the taper-shaped guide member can reduce the propulsion resistance in the soil when the wire is pulled back.

  As described above, according to the fifth aspect of the present invention, the sleeve that accommodates the cut existing pipe is attached to the rear portion of the outer tube, so that the existing pipe is accommodated in the sleeve after the cutting operation. It becomes a state. And when removing the existing pipe from the ground, it can be reduced by pulling it with the sleeve, especially when the existing pipe is made of flexible and low tensile strength material such as lead water pipe It is particularly effective in the field where the laying path is bent.

  As described above, according to the invention described in claim 6 or 7, when the existing pipes are connected by the joint, the cutting of the existing pipe by the cutting tool is obstructed by the joint and cannot be performed. Therefore, the existing pipe can be pulled out by engaging the engaging member with the joint connecting the existing pipes and pulling the joint with the wire. In addition, since the expanding member that pushes and expands the claw portion of the engaging member in the radial direction as it is pulled is attached to the wire, the engaging member can be reliably engaged with the joint, and the existing pipe is pulled out. Can be performed more reliably. When removing an existing pipe with the drawing tool according to claim 6 or 7, the existing pipe should be cut in advance with respect to the joint from both directions of the existing pipe with the cutting tool according to any one of claims 1 to 5. Since the pull-out resistance at the time of removal can be reduced, the pull-out operation can be performed more effectively.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an existing pipe cutting tool and an existing pipe drawing tool according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing a work situation when an existing pipe drawn for water supply is updated to a new pipe using the cutting tool according to the present invention, and FIG. 2 is a cutting tool according to the first embodiment. FIG. 3 to FIG. 6 are diagrams showing constituent members of the cutting tool of this embodiment.

  As shown in FIG. 1, when the existing water supply pipe 12 that is drawn into a house or the like across the road from the water supply main 10 is replaced with a new pipe, first, the water supply main pipe 10 and the existing pipe 12 A stand is excavated in the branch side and the water meter side to expose both ends of the existing pipe 12. Next, the existing pipe 12 and the water supply main pipe 10 are separated and the meter is removed. A winch 14 for winding the wire is installed on the branch side, the wire 16 is inserted into the existing pipe 12 from the meter side, and the tip of the wire 16 is fixed to the winch 14. Next, after the cutting tool 20 is fixed to the meter-side wire 16 by passing the wire through the wire, the wire 16 is wound up by the winch 14 so that the cutting tool 20 is propelled along the laying path of the existing pipe 12 and the existing pipe 12 is cut in the tube axis direction. Note that the installation position of the winch 14 may be on either the meter side or the branch side, and may be appropriately selected according to the situation at the site. Here, the configuration of the cutting tool 20 is as follows.

(1) First Example of Cutting Tool As shown in FIG. 2, the cutting tool 20 is mainly composed of an outer tube 22 and a cutter 24. As shown in FIGS. The outer tube 22 has a distal end portion 22A and a cylindrical portion 22B. The front end portion 22 </ b> A has a tapered front portion, and has a function of reducing resistance in the ground when the cutting tool 20 is pulled by the wire 16. A threaded portion 21 is formed at the rear end of the distal end portion 22A, and is screwed with the threaded portion 23 at the distal end of the cylindrical portion 22B, so that both are integrated. A wire 16 is inserted inside the outer tube 22, and a cutter 24 is fixed to the wire 16 in a fixed state. The inner diameter D of the distal end portion 22A is formed wider by about 3 mm than the outer diameter D1 (see FIG. 7) of the existing tube 12, so that the existing tube 12 can be easily inserted into the outer tube 22. It has become.

  As shown in FIGS. 5 and 6, the cutter 24 has a fixture 26, and the fixture 26 is provided with a mounting hole 26 </ b> A in the axial direction in order to be fixed in a state where the wire 16 is passed. Yes. The cutter 24 attaches and fixes the cutter 24 to the wire 16 by passing the wire 16 through the attachment hole 26A and then pressing the fixture 26 against the wire 16 with a set screw (not shown) from a direction perpendicular to the axial direction. As shown in FIG. 6, the cutter 24 is attached to the outer peripheral portion of the fixture 26 at intervals of 120 ° when viewed from the front direction by welding or the like, and a total of three cutter blades 24A are provided in the outer tube. 22 is interpolated. The cutter 24 is provided with a blade portion 24B for cutting the existing tube 12 in the tube axis direction.

  As shown in FIGS. 2 and 3, a step portion 25 that abuts the tip of the blade portion 24 </ b> B is formed on the inner peripheral portion of the tip portion 22 </ b> A of the mantle tube 22, and the cutter 24 is covered with the mantle when the wire 16 is wound up. It is designed to prevent the tube 22 from coming out. On the other hand, the cylindrical portion 22B is attached in a state of entering the inside of the distal end portion 22A when screwed and fixed to the distal end portion 22A. Therefore, even when the wire 16 is wound in the reverse direction, the cylindrical portion 22B is attached. Since the front end 27 of 22B functions as a stopper, the cutter 24 always stays in the outer tube 22.

Next, an effect | action at the time of cutting the existing pipe | tube 12 using the cutting tool 20 is demonstrated.
First, as shown in FIG. 1, both ends of the existing pipe 12 on the branch side and the meter side are exposed, and the existing pipe 12 and the water supply main pipe 10 are separated. Then, the winch 14 is installed on the branch side, the wire 16 is inserted into the existing pipe 12 from the meter side, and the tip of the wire 16 is fixed to the winch 14. Next, the cutting tool 20 is passed through the meter-side wire 16, and the existing tube 12 is inserted into the outer tube 22 while gradually winding the wire 16 with the winch 14, and the cutting tool 20 is moved along the laying path. Is pushed in the direction of arrow A.

  In this case, as shown in FIG. 7, when the wire 16 is wound up and the cutting tool 20 is propelled in the direction of arrow A, the existing pipe 12 that has entered the outer tube 22 is moved in the direction of the pipe axis by the cutter blade 24A. It is cut into three parts. At this time, the cutting operation of the existing tube 12 is performed inside the outer tube 22, and the cutter 24 is not exposed to the outside of the outer tube 22, so that, for example, a gas embedded near the laying path of the existing tube 12 is used. It is possible to prevent a situation where the cutter 24 damages the pipe, kerosene oil supply pipe, load heating wiring, hot water supply pipe, and the like. After the cut existing pipe 12 is pulled out from the ground, it is updated with a new pipe.

(2) Second Example of Cutting Tool Next, a second example of the cutting tool according to the present invention will be described. The same members as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
8-10 is the figure which showed the cutting tool of 2nd Example. The cutting tool 30 of this embodiment is different from the cutting tool 20 of the first embodiment described above in that the cutter 32 is joined to the inner wall surface 34A of the outer tube 34. That is, as shown in FIGS. 8 and 9, in the cutting tool 30, the side end portion 32 </ b> A along the tube axis direction of the cutter 32 is welded to the inner wall surface 34 </ b> A of the outer tube 34, and three cutters are attached to the outer tube 34. Each of the 32 is completely fixed. An attachment hole 32B through which the wire 16 passes is provided at the center of the cutter 32. After passing the wire 16 through the attachment hole 32B, the holding metal fitting 36 is attached to the front end portion 32C and the rear end portion 32D of the cutter 32. By attaching to the wire 16, the back and forth movement of the cutting tool 30 is prevented.

  According to the cutting tool 30 of the second embodiment, the structure is simplified as compared with the first embodiment described above, and an extra movement such as the cutter 32 being shaken when the existing pipe 12 is cut. Since it can prevent, there exists an advantage which the durability of the cutter 32 increases. FIG. 10 is an explanatory view showing a state in which the existing pipe 12 is cut by the cutting tool 30. As shown in FIG. 10, an existing pipe such as a polyethylene pipe or a vinyl chloride pipe is provided inside the outer tube 34. As shown in FIG. By inserting the tube 12 and winding the wire 16 with a winch, the existing tube 12 is divided into three in the tube axis direction in the outer tube 22 by the cutter 32 inserted therein. After the cut existing pipe 12 is pulled out from the ground, it is updated with a new pipe.

  In the first and second embodiments described above, three cutter blades are provided in the outer tube 22 or 34 at intervals of 120 °, but any number may be used.

  FIG. 11 shows a modified example in which a guide member 38 is attached to the rear portion of the cutting tool 30. The guide member 38 is formed such that the propulsion direction of the wire 16 and the end portion in the opposite direction are tapered. ing. For example, when the cutting tool 30 moves inside the existing pipe 12 and the existing pipe is connected by a joint (joint), the guide member 16 is cut by the cutting tool 30 because the cutter is blocked by the joint. become unable. In this case, the wire 16 needs to be pulled back in the opposite direction. At that time, since the end portion of the guide member 38 is formed in a tapered shape, the propulsion resistance in the soil when pulled back is reduced, and the cutting tool 30 can be smoothly pulled back in the reverse direction and recovered. .

(3) Third Example of Cutting Tool Next, a third example of the cutting tool according to the present invention will be described. The same members as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
The third embodiment shown in FIG. 12 is different in that a sleeve 28 is attached to the rear end portion of the tubular portion 22B of the outer tube 22 of the cutting tool 20. The sleeve 28 is formed in a cylindrical shape, is flexible, and is made of a material having low frictional resistance with soil or existing pipes. For example, an aluminum composite film is suitable. Further, the sleeve 28 is required to have a slightly longer overall length than the installed length of the existing pipe 12. The outer peripheral portion of the sleeve 28 is fixed to the cylindrical portion 22B at a plurality of locations by fixing screws or the like (not shown), and the wire 16 is disposed so as to be inside the sleeve 28. The underground generated when the existing pipe 12 is cut. The propulsion is performed while following the mantle tube 22 without detachment due to the propulsion resistance.

As the existing pipe 12 is cut, the cut existing pipe 12 is accommodated in the sleeve 28 so as to be wrapped therein. Since the existing pipe 12 is accommodated inside the sleeve 28 after the cutting operation is completed, the sleeve 28 may be pulled out from the ground together to remove the existing pipe 12 from the ground. At this time, since the sleeve 28 has flexibility, when the laying path of the existing pipe 12 is bent, or when the existing pipe 12 is flexible, such as a lead water pipe, and is made of a material having a low tensile strength. It is valid. That is, since the existing pipe 12 is cut into three pieces and expanded in diameter, the existing pipe 12 is removed by pulling out the entire sleeve while the entire pipe is wrapped by the sleeve 28. The frictional resistance at the time can be reduced, and the existing pipe 12 is not cut halfway.

(4) Example of extraction tool Next, an extraction tool for an existing pipe will be described with reference to FIGS. As described above, when existing pipes (for example, polyethylene pipes) are connected to each other via a metal joint (for example, a cold joint), the existing pipes by the cutting tools 20 and 30 are obstructed by the joint. However, in this case, the existing pipe is pulled out by using the pulling tool 40 shown in FIG.

  As shown in FIG. 13, the extraction tool 40 includes a tubular engaging member 42 and an expanding member 44, and each of these members is inserted into the wire 46 so that it can move together with the wire 46. It has become. As shown in FIG. 14, the engaging member 42 has a notch portion 42B formed along the tube axis direction of the tube 42A and a total of four acute-angled claw portions 42C attached to the tube 42A by welding. It has been. A stopper 43 is attached to the wire 46 on the front side of the engaging member 42, and when the wire 46 is pulled in the drawing direction of the existing pipe (direction B in FIG. 13), the engaging member 42 is unlimited on the wire 46. It has come to be restricted to move to.

  Further, the spreading member 44 is attached to the rear side with respect to the engaging member 42, and is fixed to the wire 46 by a fixing screw 45 without being displaced. As shown in FIG. 15, the expanding member 44 has a tapered portion 44 </ b> A formed at a tip portion thereof, and when the tapered portion 44 </ b> A is fitted inside the engaging member 42, the claw portion 42 </ b> C is moved in the radial direction. It is designed to expand.

16 and 17 show the operation when the extraction tool 40 is used.
As shown in FIG. 16, when it is assumed that the existing pipe 48 is connected to an existing pipe (not shown) located in the right direction in the drawing via the joint 50 and the core 50A, depending on the cutting tool 20 or 30 described above, Therefore, the existing pipe 48 cannot be cut in the pipe axis direction. In this case, after the cutting tool 20 or 30 is collected, the removal of the existing pipe 48 is attempted using the extraction tool 40 of the present embodiment. At that time, as shown in FIG. 16, the extraction tool 40 is inserted into the existing pipe 48 together with the wire 46 in the direction of arrow C with respect to the existing pipe 48. Then, the claw portion 42 </ b> C of the engagement member 42 hits the edge of the core 50 </ b> A of the joint 50, and the engagement member 42 cannot move relative to the existing pipe 48. As shown in FIG. 17 (in FIG. 17, for convenience of description, the core 50A and the claw portion 42C are not in contact), as the wire 46 is pushed in the C direction, the expanding member 44 The taper portion 44 </ b> A is fitted into the engagement member 42. As a result, the tapered portion 44A pushes and expands the four claw portions 42C in the radial direction of the existing pipe, and completely engages the claw portion 42C with the core 50A of the joint 50. If the wire 46 is further wound up in this state, the engaging member 42 is completely engaged with the core 50A and cannot be removed, so that the existing pipe 48 can be pulled out from the ground by the pulling force of the wire 46. it can.

  In the extraction tool 40, four claw portions 42C of the engaging member 42 are provided. However, the number may be any number as long as it can be reliably engaged with the joint 50 connecting the existing pipes 48 to each other. .

FIG. 18 shows a modification of the engaging member. Whereas the claw portion 42C of the engaging member 42 is joined to the pipe 42A by welding, the engaging member 52 is sharpened and fan-shaped when viewed from the front by cutting out one tubular member. Four claw portions 52C are formed on the tube 52A. In addition, four continuous cutouts 52B are formed from the claw 52C to the middle of the pipe 52A, and these cutouts 52B are formed on the claw 52C by the taper 44A of the expanding member 44 in the radial direction. The operation that spreads out is possible. The claw portion 52C of the engaging member 52 has a larger contact area when engaged with the core 50A than the claw portion 42C of the engaging member 42 described above, and therefore requires a strong pulling force in the pulling operation of the existing pipe 12. It is effective in the case of work. Which of the engaging members 42 and 52 is to be used may be selected according to the laying status of the existing pipe and the laying distance.

As described above, since the existing pipe cutting tools 20 and 30 perform the cutting operation of the existing pipe within the outer tube, the cutting work can be performed without damaging other embedded objects around the existing pipe. Can do.
Further, in the existing pipe pulling tool 40, when the existing pipes are joined to each other via a joint, the existing pipe is pulled out using the joint, so that the existing pipe is quickly removed. It is possible to carry out renewal construction to new pipes without cutting.

  As described above, in the present invention, according to the cutting tool for the existing pipe, since the cutting operation for the existing pipe is performed inside the outer tube, without damaging the other buried objects around the existing pipe, Cutting work can be performed.

  In addition, according to the existing pipe pulling tool, when existing pipes are connected via a joint, the existing pipe can be pulled out using the joint. As a result, it is possible to reduce the cost required for the construction and shorten the construction time.

It is explanatory drawing which showed the operation | work condition in the case of using the cutting tool which concerns on this invention, and updating the existing pipe withdrawn for water supply to a new pipe. It is sectional drawing of the cutting tool which concerns on a 1st Example. Similarly, it is sectional drawing of the front-end | tip part of the mantle tube which is a structural member of the cutting tool which concerns on a 1st Example. Similarly, it is sectional drawing of the cylindrical part of the mantle tube which is a structural member of the cutting tool which concerns on a 1st Example. Similarly, it is a sectional side view of a cutter which is a constituent member of the cutting tool according to the first embodiment. Similarly, it is a front view of a cutter which is a constituent member of the cutting tool according to the first embodiment. Similarly, it is a sectional view showing a case where an existing pipe is cut using the cutting tool according to the first embodiment. It is a side view of the cutting tool which concerns on a 2nd Example. Similarly, it shows the cutting tool according to the second embodiment, and is a view taken along the line XI-XI in FIG. Similarly, it is explanatory drawing which showed the condition at the time of cutting an existing pipe | tube using the cutting tool which concerns on a 2nd Example. Similarly, it is the sectional side view which showed the modification of the cutting tool which concerns on a 2nd Example. It is the sectional side view which showed the cutting tool which concerns on a 3rd Example. It is the schematic perspective view which showed the structure of the extraction tool which concerns on one Example. Similarly, it is the side view and front view of the engaging member which are the structural members of the extraction tool which concerns on one Example. Similarly, it is a side view of the expansion member which is a structural member of the extraction tool which concerns on one Example. Similarly, it is explanatory drawing which showed the use condition of the extraction tool which concerns on one Example. Similarly, it is explanatory drawing which showed the use condition of the drawing tool which concerns on one Example. It is the side view and front view of the modification of an engaging member.

Explanation of symbols

10 Water supply main
12 Existing pipe
14 winches
16 wires
20 Cutting tool
22 Mantle tube
22A Tip
22B cylindrical part
24 cutters
25 steps
26 Fixing tool
28 sleeve
30 Cutting tool
32 cutters
34 Mantle tube
34A inner wall
36 Presser bracket
38 Guide member
40 Extraction tool
42 52 engagement member
42C Claw
43 Stopper
44 Expanding member
45 Fixing screw
46 wires
48 Existing pipe
50 joints
50A core

Claims (7)

In a cutting tool equipped with a cutter that cuts an existing pipe in the pipe axis direction by moving with the wire while passing the wire through the existing pipe buried in the ground,
The outer tube, which is formed in a cylindrical shape and has a tapered tip portion, is arranged through the wire, and the outer tube has an inner diameter that allows an existing tube to be inserted into the tube. A cutting tool for an existing pipe, wherein the existing pipe is cut by the cutter inside the outer tube. An existing pipe cutting tool, wherein the cutter is joined to an inner wall surface of an outer tube.   The said outer tube is comprised from the front-end | tip part formed in the taper shape, and the cylindrical part provided in this front-end | tip part so that attachment or detachment was possible, The cutting | disconnection of the existing pipe | tube of Claim 1 or 2 characterized by the above-mentioned. tool. 4. A cutting tool for an existing pipe according to claim 1, wherein a guide member having both ends of the wire propulsion direction and the opposite direction tapered is attached to a rear portion of the cutter. A tubular flexible sleeve that accommodates the existing pipe cut by the cutter is attached to the rear part of the outer tube, and after cutting the existing pipe, the cut existing pipe is removed from the ground together with the sleeve. The existing pipe cutting tool according to claim 1, wherein the existing pipe cutting tool is provided. An existing pipe, in which existing pipes are connected to each other through a joint, and an engagement member that engages with the joint is provided on a wire that is inserted into the existing pipe that is buried. Extraction tool. The engaging member is provided with a claw portion that engages with the joint, and the engaging member is attached and fixed to the wire when the wire is pulled in the drawing direction of the existing pipe. The existing pipe pulling tool according to claim 6, wherein the tapered portion is configured to push the claw portion in a radial direction of the existing pipe by being fitted inside the engaging member.

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