JP2008256016A - Construction method for connecting newly-laying pipe member, and cutting tool for closed pipe end portion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a connecting construction method and a cutting tool for a closed pipe end capable of connecting a newly-laying pipe member by excavating a hole larger than the pipe outside diameter of a pipe member connected around the pipe member along the pipe member. <P>SOLUTION: A connecting member 2 is driven and laid into the earth and sand in a state that the connecting member with a shutoff member 15 inserted into a hole 2b is connected to a main branch pipe 3. Then, when the newly-laying pipe member 1 is connected to the connecting member 2, the tool body A1 of the cutting tool A provided with a cutting blade A2 is fitted from an axial direction to the side of the closed pipe end 2a of the connecting member 2, and axially moved while being rotated to cut off the closed pipe end 2a. Next, after the connecting member 22 is connected to the cut opening of the connecting member 2, the shutoff member 15 is moved to the side of the connecting member 22, and a part of the connecting member 22 positioned further upstream of a portion where the shutoff member 15 is positioned is crushed and blocked to shut off axial communication. Next, the shutoff member 15 is extracted from the connecting member 22, and the newly-laying pipe member 1 is connected to the connecting member 22. Lastly, the blocked portion 23 of the connecting member 22 is opened. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a connection method for a new piping member and a cutting tool for a closed pipe end, for example, from an existing piping member (main branch) laid in the ground such as a public road, to an adjacent private side, etc. The present invention relates to a connection method of a new piping member for drawing into the pipe, and a cutting tool used to cut off and open an end of a closed pipe when connecting the new piping member in this connection method.

  Pipes such as gas pipes and water pipes that are drawn in from the main pipes such as gas and water pipes laid under the public roads to the private land adjacent to the public roads are made of polyethylene ( PE) or other synthetic resin material.

By the way, in the piping laid in the ground, the asset classification is often divided into piping according to the land ownership classification. Taking a gas pipe as an example, the main branch of gas laid under a public road is an asset of the gas company. And the gas piping laid in the private land adjacent to the public road is the property of the landowner.
For this reason, when the gas pipe is drawn into the private land by branching from the main branch under the public road, the pipe assets will change at the boundary between the public road and the private land. When construction is conducted into a private area, the construction contractor and construction period differ depending on the asset category. For this reason, the end of the pipe is once separated and cut off in the vicinity of the ground, and a preparatory work for connecting a new pipe separately from the cut off end is performed.

  In addition, if it is expected that the piping will be extended regardless of the situation of such asset classification, the piping will be laid halfway or a branch joint with the pipe connection port cut off will be installed. There is a case in which piping work is performed in advance so that new piping is connected at an appropriate time such as a later date.

When plumbing to draw a gas pipe from the main branch under the public road to the neighboring private land, etc., the range from the public road at the branch branch of the main branch to the private boundary It is necessary to excavate a vertical hole (vertical shaft) for work in Japan, but generally there is a gutter on the public road side along the boundary, and blocks and fences etc. on the private side along the boundary There is often a boundary wall consisting of
For this reason, when excavating a vertical hole for work in the side groove, the support of the side groove becomes unstable, and the side groove may be depressed or a crack may occur. The efficiency was poor and the burden on the workers was large.

Further, in the piping work, a cutting operation for cutting the gas pipe is required, but conventionally, it has been performed using a rotary cutter or the like known in Patent Document 1 or the like.
The rotary cutter includes an arcuate rotary blade support portion that protrudes and supports the rotary blade on the concave side, and includes a pair of frame members provided with connecting piece portions on both ends of the rotary blade support member. The pair of frame members include a through-hole for connecting the coupling screw rod to one of the connection piece portions and penetrating the coupling screw rod to the other connection piece portion.
Then, the rotary cutter has a pair of frame members arranged so that the concave portions of the rotary blade support portions are opposed to each other, and the coupling screw rod of the one side frame member is passed through the through hole of the other side frame member and is tightened. The nut is tightened by a nut, and the cutting blade handle of the pair of frame members is provided with a cutting operation handle that supports the rotating blade.
Japanese Patent Laid-Open No. 9-253926 (see paragraph numbers 0012 to 0016 and FIGS. 2 and 3)

  However, the rotary cutter of Patent Document 1 is used for coupling after the rotary blade support portions of the pair of frame members supporting the rotary blade are set along the outer periphery of the gas pipe when cutting the gas pipe. All the rotary blades are brought into contact with the outer periphery of the gas pipe with a desired pressure by tightening a tightening nut screwed to the screw rod using a rotation operation handle. In this state, the pair of frame members are rotated along the outer periphery of the gas pipe by the cutting operation handle, so that the rotary blade is rotated and moved along the gas pipe so as to bite into the outer periphery of the gas pipe. When the contact force of the rotary blade against the gas pipe is weakened by biting into the outer periphery, the gas pipe is cut while repeating the tightening of the tightening nut several times using the rotary operation handle again. .

  The cutting of the gas pipe using the rotary cutter configured as described above is performed by the tightening nut for the engagement screw rod that repeatedly connects the pair of frame members in order to maintain the contact force of the rotary blade with respect to the outer periphery of the gas pipe. Since tightening is required, it is cumbersome and workability is poor.

In addition, an operation for rotating the pair of frame members on the outer circumference of the gas pipe and an operation for tightening the tightening nut using the rotation operation handle are required. Requires a work space to perform these operations. That is, the above-described vertical hole (vertical shaft) is not limited to the piping space (width) in order to draw the gas pipe, and must be excavated so as to ensure a wide working space.
For this reason, as described above, not only is the workability poor, but there is also a problem in the safety of construction due to the unstable support of side grooves and moats.

  Therefore, the present invention has been developed to solve the above-described problems, and is larger than the pipe outer diameter of the pipe member to be connected when performing piping work for connecting the new pipe member to the existing pipe member. It is an object of the present invention to provide a connection method that enables connection of a new piping member and a cutting tool at the end of a closed tube by excavating the hole of the pipe along the piping member.

In order to solve the above-mentioned problem, the present invention has a hole portion that opens at one end and extends toward the closed tube end side at the other end in preparation for connecting a new piping member to an existing piping member. A connecting member that is slidably inserted into a blocking member for blocking the axial flow is laid in advance from the connection site with the existing piping member toward the laying direction of the new piping member. A connection method,
A step of cutting off and opening the closing pipe end of the connecting member; and connecting one end of a connecting member made of synthetic resin to the cutting opening of the connecting member cut off and opening the blocking member. And the flow of the connecting member in the axial direction is blocked by crushing and sealing a part of the connecting member located upstream of the position where the blocking member is located. A step, a step of extracting and removing the blocking member from the sealed connection member, a step of connecting the new piping member to the other end side of the connection member, and opening the sealing portion of the connection member, A step for circulating the existing piping member and the newly installed piping member via the connecting member and the connecting member,
The step of cutting off and opening the closing pipe end of the connecting member is performed by a cutting tool that is fitted to the connecting member from the axial direction of the connecting member and is moved in the axial direction while rotating. The connection method for piping members.

In addition, in the present invention, in preparation for connecting a new piping member to an existing piping member, it is laid and connected in advance to the existing piping member, and the other end from the opening side of one end connected to the existing piping member. The operation of moving the closing pipe end of the synthetic resin connecting member having a hole extending on the closed end side in the axial direction while being fitted on the connecting member and rotating from the axial direction of the connecting member A cutting tool for opening by cutting,
A tool main body having an inner diameter to be fitted to the connection member, and a cutting blade provided so that a blade edge protrudes from the direction orthogonal to the axial direction of the tool main body toward the inner surface of the tool main body, The cutting edge of the cutting blade protrudes from the inner surface of the tool body so as to be orthogonal to the axial direction at least by an amount corresponding to the tube thickness extending from the outer surface to the inner surface of the connection member. It is in the cutting tool of the closed pipe end in the connection method.

According to the connection method of the newly installed piping member according to the present invention, the connecting member for connecting the newly installed piping member toward the vicinity of the private land side adjacent to the existing piping member such as under a public road is provided. When performing piping work for laying in advance and piping work for drawing new piping members from connecting members toward the consumer on the private side, there are side grooves along the public road. However, it is possible to carry out the piping work without digging a large vertical hole or the like where the support of the side groove becomes unstable.
As a result, the work load is reduced, the labor for workers can be reduced, the safety of construction can be improved, and the construction period can be greatly shortened. Furthermore, plumbing work can be performed within the land ownership division.

Further, according to the cutting tool for the closed pipe end according to the present invention, it is connected to the existing piping member and is laid in advance in the ground with the closed pipe end facing near the boundary between the public road and the private land. In the case of performing a cutting operation by cutting off the opening of the closed pipe of the connecting member, the tool main body is fitted on the connecting member from the axial direction of the connecting member, and then the tool main body is rotated using a rotary drive machine. By moving in the axial direction, the end of the closed tube of the connecting member can be cut off by the cutting blade.
As a result, even if there is a side groove along the public road, the new pipe member is connected to the existing pipe member under the public road via the connection member without digging a large hole such as unstable support of the side groove. It is possible to carry out plumbing work to do. Therefore, as described above, it is possible to reduce the labor for the worker, improve the safety of the construction, and greatly shorten the construction period.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
The connection method according to the present embodiment is a new pipe that is a lead-in pipe that is branched from the main pipe 3 that is an existing pipe member laid in the ground such as a public road and drawn into a consumer in a private area adjacent to the public road. Connection in which one end opening side is connected to the main branch pipe 3 and the other end is a closed pipe end portion 2a in the earth and sand located near the boundary line T between the public road and the private land when the piping member 1 is laid The member 2 is to be laid in advance (see (c) to (e) of FIG. 7 described later).

  And the cutting tool A which concerns on this embodiment is new piping toward the consumer in a private area via the connection member 2 currently laid near T on the boundary line of a public road and a private area It is used to cut off and open the closed pipe end 2a of the connecting member 2 that is buried near the ground line T during piping work when the member 1 is drawn and laid (described later). 4 and FIG. 9).

≪Configuration of cutting tool≫
FIG. 1 and FIG. 2 are longitudinal side views showing a cutting tool used for opening a closed pipe end portion of a connection member in the process of performing the connection method of the newly installed pipe member according to the present embodiment. 3 is a perspective view showing the cutting tool.
As shown in FIG. 1, the cutting tool A includes a tool body A1 having a cylindrical shape and a cutting blade A2 attached to the tool body A1.

≪Tool body configuration≫
The tool body A1 is formed in a cylindrical shape having an appropriate length with one end opened and the other end closed with an appropriate metal material or synthetic resin material.
As shown in FIGS. 1 and 2, the tool main body A1 has an inner diameter L3 in a range L1 reaching the one end opening side at a portion where the cutting blade A2 is attached, so that the outer diameter of the connection member 2 is substantially the same. The large-diameter hole portion 1a is formed, and the inner diameter L4 of the range L2 reaching the closed end portion side of the other end is the small-diameter hole portion 1b formed to be substantially the same diameter as the inner diameter of the connection member 2.
Thereby, a step portion 1c is formed between the large-diameter hole portion 1a and the small-diameter hole portion 1b as shown in FIG. The large-diameter hole portion 1a has a guide function when the tool body A1 is fitted on the closing tube end portion 2a side of the connecting member 2 and moved while rotating in the axial direction, and the small-diameter hole portion 1b is closed. It has a discharge function for discharging chips a generated when the tube end 1a is cut open to the outside through a window hole 9 described later (see (b) to (d) of FIG. 4 described later). ).

Moreover, tool main body A1 is provided with the engaging part 4 in the axial center of a closed end part.
As shown in FIGS. 1 and 3, the engaging portion 4 is formed in a hexagonal hole shape. Thereby, it connects with the hexagonal connection part 4a attached to the output shaft B of portable rotation drive machines (illustration omitted), such as an electric tool, so that engagement / disengagement is possible.

Further, as shown in FIGS. 1 to 3, the tool main body A1 includes a blade mounting portion 5 at an outer peripheral portion to which the cutting blade A2 is attached so as to be orthogonal to the axial direction of the tool main body A1.
As shown in FIG. 2, the blade mounting portion 5 is integrally protruded with an inclination of an acute angle θ with respect to a diagonal line X passing through the axis of the tool body A1.
Thereby, as shown in FIG. 1, the cutting blade A2 is mounted with a blade so that the blade edge a2 protrudes from the inner surface of the small diameter hole portion 1b of the tool body A1 in a direction perpendicular to the axial direction of the tool body A1. It is attached to the part 5. As shown in FIGS. 1 and 2, the cutting edge A2 of the cutting blade A2 attached so as to slightly protrude from the inner surface of the small-diameter hole portion 1b has a sharp edge portion toward the rotation direction of the tool body A1. Thus, the closed tube end 2a of the connecting member 2 can be efficiently cut in a sharp state so that the opening can be cut off.

  Further, a slide groove portion 7 is provided on one side surface of the blade mounting portion 5 that faces the closed end portion side of the tool main body A1. The slide groove portion 7 is formed so that the cutting blade A2 can be slidably attached using a bolt (hexagon wrench bolt or the like) 6 with the cutting blade A2 facing the inner surface of the tool body A1, and a screw hole 8 is formed in the groove bottom. It has.

  Further, the tool main body A1 includes a window hole 9 so as to reach from the base end (base) of the blade mounting portion 5 to the end surface of the closed end portion. The window hole 9 is formed in the peripheral wall of the small-diameter hole portion 1b of the tool main body A1 with an opening width corresponding to the groove width of the slide groove portion 7 of the blade mounting portion 5, and is cut out by the cutting blade A2. The chips a are discharged to the outside.

The cutting blade A2 is generally used as a material such as a blade and is formed of a desired metal material. As shown in FIG. 3, the cutting blade A <b> 2 is formed in a substantially rectangular shape having an appropriate thickness (plate thickness) that is slidably set in the slide groove portion 7 of the tool body A <b> 1. In addition, a cutting edge a2 is provided on one side edge of the short side.
Further, the cutting blade A is provided with a long hole 10 for sliding, and by loosening the bolt 6, the amount of protrusion from the inside of the tool body A1 can be adjusted as appropriate.
In addition, as shown in FIG. 1, it is preferable to set the protrusion amount l of the blade edge a2 in the axial direction from the inner surface of the small diameter hole 1b of the tool body A1 to about 0.1 to 0.2 mm. It becomes.

[Description of cutting tool operation]
Next, the use of the cutting tool A according to the present embodiment configured as described above will be briefly described.
FIG. 4 is a longitudinal cross-sectional view showing stepwise a state in which the cutting tool is moved in the axial direction of the connecting member as the cutting progresses when the closed pipe end portion of the connecting member is cut open.
First, the tool body A1 is closed in a state in which the large-diameter hole 1a side of the tool body A1 that is opened is fitted and set on the outside of the closing tube end 2a of the connecting member 2 so as to be covered from the axial direction. The connecting portion 5 provided on the output shaft B of the portable rotary drive machine is fitted and inserted into the engaging portion 4 at the end (state in FIG. 4A). At this time, the tool body A1 may be fitted and set to the closing tube end 2a of the connecting member 2 in a state where the tool body A1 is connected to the connecting portion 5 of the output shaft B in advance.
In this state, a force is applied in a direction in which the tool main body A1 is pushed in the axial direction of the connecting member 2 while the portable rotary drive is driven to rotate the tool main body A1. Then, the cutting edge A2 of the cutting blade A2 addressed to the curved surface of the closed tube end 2a having a substantially warhead shape is formed by cutting the closed tube end 2a while cutting the closed tube end 2a in the circumferential direction. The process of shaving toward the axial direction of the connecting member 2 proceeds (state shown in FIG. 4B). At this time, the scraped chips a are discharged to the outside from the window hole 9 of the small diameter hole 1b.

  When the progress of the cutting process reaches the root of the closed pipe end 2a, the fusion part 11 with respect to the connecting member 2, the residue (remnant head) 12 that remains without being cut remains in the small-diameter hole 1b. In this state (the state shown in FIG. 4C), the cutting ends when the cutting of the connecting member 2 in the axial direction further proceeds. Thereby, the connection member 2 is opened (state of FIG.4 (d)).

According to the cutting tool A according to the present embodiment configured as described above, as shown in FIG. 4, after the tool body A <b> 1 is fitted on the connecting member 2 from the axial direction of the connecting member 2, an electric tool or the like By moving the tool main body A1 in the axial direction using the portable rotary drive machine, the closed tube end 2a of the connecting member 2 can be cut off by the cutting blade A2.
Thereby, for example, the closed pipe end portion of the connecting member 2 connected to the main branch 3 and driven in advance into the ground with the closed pipe end portion 2a facing near the boundary T between the public road and the private land. When performing a cutting operation to cut open 2a, even if there is a side groove C along the public road, the main branch pipe 3 under the public road does not dig a large hole such as unstable support of the side groove C. Piping work for connecting the new piping member 1 through the connecting member 2 can be performed.

<< Configuration of Cutting Tool According to Other Embodiment >>
FIG. 5 is a longitudinal sectional view showing another embodiment of the cutting tool.
In such an embodiment, since the other components other than the configuration of the cutting blade A2 are basically the same as the above-described cutting tool A, the same components are denoted by the same reference numerals and redundant description is given. Is omitted.
That is, as shown in FIG. 5, the cutting blade A3 includes a cutting edge a3 along one side edge in the longitudinal direction. Further, the cutting blade A3 is provided with a polygonal line 13 extending obliquely in the lateral direction at equal intervals in the longitudinal direction. In the case of such a cutting blade A3, locking grooves 14 corresponding to the plate thickness of the cutting blade A3 are provided on both sides of the groove bottom of the slide groove portion 7 of the blade mounting portion 5, and the cutting blade 3 is a slide groove portion. 7 is detachably fixed.
Thereby, when cutting off the closing tube end 2a of the connecting member 2 and opening the blade edge a3, the cutting blade A3 is removed from the blade mounting portion 5 of the tool body A1, and the cutting edge side of the cutting edge A3 is removed. By folding from the broken line 13 (state of the two-dot chain line in FIG. 5), the cutting operation can be continued with the new cutting edge a3.

≪Configuration of connecting member≫
FIG. 6 is a longitudinal sectional view showing a connection member used in the connection method for the newly installed piping member according to the present embodiment.
The connecting member 2 is formed in a tube shape from a synthetic resin material such as polyethylene, polypropylene, or vinyl chloride resin. As shown in FIG. 6, the connecting member 2 is provided with a hole portion 2 b that opens at one end side and extends from the one end opening side to the closed tube end portion 2 a at the other end side.
The closed tube end portion 2a has a substantially bullet shape formed so as to narrow the outer surface in a curved manner toward the tip. As a result, a large force is exerted on the connecting member 2 in the earth and sand facing from the vicinity of the main branch pipe 3, which is an existing piping member laid in the ground such as under public roads, to the boundary line T with the adjacent private land. It can be driven in and swiftly laid without being required (see FIG. 7C described later).

Then, as shown in FIG. 6, a blocking member 15 for blocking the axial flow is inserted into the hole 2 b of the connecting member 2, and the movement of the blocking member 15 in the axial direction is suppressed. An annular projection 16 is provided on the inner peripheral surface of the hole 2b on the closed tube end 2 side.
The blocking member 15 is formed of a synthetic resin material or the like, similar to the connection member 2. As shown in FIG. 6, the blocking member 15 protrudes in a substantially neck shape from a cylindrical blocking portion 15 a having the same diameter as the inner diameter of the hole 2 b and one end of the blocking portion 15 a in the axial direction. And a shaft portion 15b.
The blocking member 15 includes two seal members 16 arranged in parallel to the outer periphery of the blocking portion 15a, and a flexible pullout member 17 made of a string or the like is provided on the protruding end side of the shaft portion 15b. . Thereby, the blocking member 15 can be moved in the axial direction of the hole 2b, and the blocking member 15 can be pulled out from the hole 2b by the pulling member 17 (see (b) of FIG. ) To (d)).

≪Explanation of connection method for new piping members≫
Next, a method of connecting the newly installed piping member 1 to the main branch pipe 3 using the cutting tool A according to the present embodiment configured as described above will be described.
FIG. 7 and FIG. 9 are schematic views showing the construction procedure of the connection method for the newly installed piping member according to the present embodiment.
First, the piping work of the connecting member 2 laid from the main branch pipe 3 laid under the public road toward the boundary T with the private land will be described with reference to FIG.
As shown in FIG. 7 (a), after excavating a vertical hole (vertical shaft) 18 on the public road so that the main branch 3 is exposed, it is branched to the exposed main branch 3 as shown in FIG. 7 (b). A joint 19 is attached.
Next, as shown in FIG. 7 (c), the connecting member 2 is driven into the earth and sand from the excavation wall surface of the vertical hole 18 near the branch joint 19 toward the boundary line T with the adjacent private land. At this time, the operation of driving the connecting member 2 into the earth and sand with the blocking member 15 not inserted into the hole 2b or with the blocking member 15 inserted into the hole 2b is optional.
In addition, it is preferable that the closed pipe end 2a of the connecting member 2 does not protrude from the ground line T to the private side. Thereby, when construction other than piping work is performed on the private side, when the vertical hole is excavated, the connecting member does not hinder excavation.

  After the work for driving and laying the connecting member 2 into the earth and sand is completed in this way, one end of the connecting member 2 that is open is connected to the branch joint 19 as shown in FIG. As a result, the piping work on the public road provided for connecting the new piping member 1 to the main branch 3 later is completed, and finally, as shown in FIG. .

After the connection member 2 in which the blocking member 15 is inserted into the hole 2b is driven in advance to the vicinity of T on the boundary line between the public road and the private land in accordance with the construction procedure as described above, Connection of the piping member 1 will be described.
FIG. 8 and FIG. 9 are schematic views showing a construction procedure in the connection method according to the present embodiment when piping work for a new piping member is performed on the private side. Here, description will be made with reference to FIG. 4 as appropriate.
As shown in FIG. 8, a vertical hole 20 having a depth where the connecting member 2 is driven and laid is excavated, and the excavation wall of the vertical hole 20 leads to the closed pipe end 2a of the connecting member 2, and a cutting tool. The horizontal hole 21 is excavated so that a hole diameter (space) that can be rotated in a state where A is fitted and set to the connection member 2 is secured around the connection member 2.
After the excavation work of the horizontal hole 21 is finished, as shown in FIG. 4A, the large-diameter hole 1a side of the tool main body A1 of the cutting tool A is connected to the closed pipe end 2a of the connecting member 2. It is fitted and set on the outside so as to cover from the axial direction. Thereafter, the closing pipe end 2a is cut off by the cutting operation detailed in FIGS. 4B to 4D, and the other end of the connecting member 2 is opened (state shown in FIG. 9A).
When the connecting member 2 is opened by such a cutting operation, when the blocking member 15 is pushed by the gas pressure and tries to come out from the hole 2b, the movement of the blocking member 15 is regulated by the regulating projection 16. Thereby, the blocking member 15 is not detached from the hole 2b due to the gas pressure together with the opening of the connecting member 2. Thereby, a situation such as gas leakage is prevented.

After opening the other end of the connecting member 2 in this way, as shown in FIG. 9B, the connecting member 2 is connected to one end side of the connecting member 22 made of synthetic resin, and the connecting member 2 is connected. The blocking member 15 inserted in the hole 2 b is pulled out and moved to the other end side of the connecting member 22 using the pulling member 17.
Although illustration is omitted, by providing the restricting projection 16 on the inner peripheral surface on the other end side of the connecting member 22 as in the case of the connecting member 2, safety against gas leakage and the like can be improved. Is.

When the blocking member 15 is moved to the other end side of the connecting member 22, a part of the connecting member 22 on the upstream side of the blocking member 15 is crushed as shown in FIG. Blocking process is performed to block the axial flow.
Then, as shown in FIG. 9 (d), after pulling out and removing the blocking member 15 from the connecting member 22, the new piping member 1 is connected to the other end of the connecting member 22 and the sealed portion 23 is opened (released). ) To return the distribution of the connecting member 22, the piping work on the private side is completed. Finally, the horizontal holes 21 and the vertical holes 20 are backfilled.

The connection method of the newly established piping member 1 according to the present embodiment is configured as described above, toward the vicinity of T on the boundary line with the adjacent private land side from the main branch pipe 3 under the public road, Piping work on the public road side for laying the connecting member 2 for connecting the new piping member 1 in advance, and closing of the connecting member 2 for drawing the new piping member 1 from the main branch 3 toward the consumer A large hole such as the support of the side groove C becomes unstable even if the side groove C exists along the public road in the case of piping work on the private side for cutting off and opening the pipe end 2a. Piping can be carried out without digging.
As a result, the work load is reduced, the labor for workers can be reduced, the safety of construction can be improved, and the construction period can be greatly shortened. Furthermore, plumbing work can be performed within the land ownership division.

Further, the shape of the connecting member 2 on the closed tube end 2a side has a substantially bullet shape formed so as to narrow the outer surface in a curved manner toward the tip. Thereby, when driving the connecting member 2 into the earth and sand toward the boundary line T with the adjacent private land from the vicinity of the main branch pipe 3 which is an existing piping member laid in the ground such as under a public road, It can be driven and laid quickly without requiring a large force.
In addition, the closed pipe end 2a of the connecting member 2 into which the blocking member 15 is inserted is positioned on the public road side with respect to the boundary line T between the public road and the private land, so that other than piping work on the private land side When the other hole is excavated and the vertical hole is excavated, the connecting member 2 does not hinder excavation.

Note that the specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there are design changes and the like within a scope not departing from the gist of the present invention described in claims 1 to 4. Are also included in the present invention.
For example, when a private customer is dismantled and the supply of gas is stopped, one end of the connecting member 2 that cuts the drawing piping member (existing piping) on the boundary line T and inserts the blocking member 15 By connecting the opening to the cut piping member, the connecting member 2 can be laid. In this case, it is desirable that the closing pipe end 2a of the connecting member 2 is positioned on the public road side with respect to the boundary T.
As a result, as described above, the connecting member 2 does not hinder excavation of a vertical hole or the like when work other than piping work is performed. Further, the gas supply can be restored by performing the piping work on the private side shown in FIGS.

  A plurality of cutting blades A2 can be attached to the tool body A1 of the cutting tool A in the circumferential direction. Moreover, as a form of the engaging part 4 in the closed end part of the tool main body A1, a knurl for preventing rotation is applied to the inner peripheral surface of the hole, or a projecting shape such as a hexagon is formed instead of the hole. be able to. That is, it is not limited as long as it has a structure and shape that are integrated with the output shaft B of the portable rotary drive machine in the rotational direction and can be freely engaged and disengaged in the axial direction.

  Furthermore, the mouth of the large-diameter hole 1a of the tool body A1 is expanded to a trumpet shape, and the axial or circumferential protrusion is provided at an appropriate interval in the inner peripheral surface direction of the large-diameter hole 1a. Articles can be provided. As a result, the contact with the outer peripheral surface of the connection member 2 is not a surface but a line contact by a protrusion, so that the cutting tool A moves or rotates in the axial direction when the closed tube end 2a is cut off. You can expect effects such as faster direction movement.

It is a longitudinal section showing a cutting tool concerning this embodiment. It is a longitudinal cross-sectional view when it sees from the arrow direction of the II-II line of FIG. It is a perspective view of the cutting tool which shows the state where the cutting tool was separated from the tool body. It is a longitudinal cross-sectional view which shows the state which moves a cutting tool to the axial direction of a connection member in connection with progress of cutting, when cutting off and opening the closing pipe end part of a connection member, (a) is a connection member (B) shows a state in which the tool body is fitted and set on the connection member so that the cutting edge of the cutting blade is placed on the outer surface of the closed tube end, and the outer surface of the closed tube end is cut halfway in the axial direction. (C) shows the state in which the cutting process has been advanced, (c) shows the state in which the cutting process has been advanced to the stage of cutting off the end of the closed tube from the connecting member, and (d) shows the process of cutting the connecting member in the axial direction. The state in which the cutting process has progressed to the time point is shown. It is a longitudinal cross-sectional view when the cutting tool which concerns on other embodiment is shown, and it sees from the arrow direction of the IV-IV line of FIG. It is a longitudinal cross-sectional view which shows the connection member which concerns on this embodiment, and abbreviate | omits and shows length. It is a schematic diagram for explaining the flow of piping work on the public road side in the connection method according to the present embodiment, (a) shows a state in which a working vertical hole has been excavated in the public road where this branch pipe is laid, (B) shows a state where a branch joint is attached to this branch pipe, (c) shows a state where the connecting member is driven and laid in the earth and sand, and (d) shows a state where the connecting member is connected to the branch joint. (E) shows a state where the vertical hole of the public road is backfilled. It is the schematic for explaining the piping construction in the private side in the connection construction method, in order to cut and open the closed pipe end of the connection member, the work vertical hole and the horizontal hole from this vertical hole toward the circumference of the connection member Shows the state of drilling. It is the schematic for demonstrating the flow of the piping construction in the private land side, (a) shows the state which cut off the closing pipe end part from the connection member, (b) is connected with the cutting opening of a connection member The members are connected and the blocking member is moved from the connecting member to the connecting member. (C) shows the state where the upstream side of the connecting member is crushed and sealed, (d) shows the state from the connecting member. (E) which shows the state which pulled out the interruption | blocking member outside, (e) shows the state which released the sealing part of a connection member, after connecting a new piping member to a connection member.

Explanation of symbols

A: Cutting tool, A1: Tool body, A2, A3: Cutting blade, a2, a3: Cutting edge, 1: New piping member, 2: Connection member, 2a: Closed pipe end, 2b: Hole, 3: Main branch pipe (Existing piping member), 4: engaging part, 5: blade mounting part, 6: bolt, 7: slide groove part, 8: screw hole, 9: window hole, 15: blocking member, 22: connecting member, 23: sealing Part B: Output shaft (rotary drive)

Claims (4)

In order to connect a newly installed piping member to an existing piping member, it has a hole that opens at one end and extends toward the other end of the closed tube, and a blocking member for blocking axial flow in this hole A connecting member that has been laid in advance in the direction of laying the new piping member from the connection site with the existing piping member, the connecting member that is inserted so as to be slidable and slidable,
Cutting off and opening the closing tube end side of the connecting member;
The step of moving the blocking member to the other end side of the connecting member after connecting one end side of the connecting member made of synthetic resin to the cut opening of the connecting member cut-off,
Shutting off the fluid flow in the axial direction of the connecting member by crushing and sealing a part of the connecting member located upstream of the position where the blocking member is located; and
Extracting and removing the blocking member from the sealed connecting member;
Connecting the new piping member to the other end of the connecting member;
Opening the sealed portion of the connecting member, and circulating the existing piping member and the newly installed piping member via the connecting member and the connecting member,
The step of cutting off and opening the closing pipe end of the connecting member is performed by a cutting tool that is fitted to the connecting member from the axial direction of the connecting member and is moved in the axial direction while rotating. Piping member connection method. In preparation for connecting a new pipe member to an existing pipe member, the pipe member is previously laid and connected to the existing pipe member, and extends from the opening side of one end connected to the existing pipe member to the closed end side of the other end. For opening and closing the closing pipe end of the connecting member made of synthetic resin having a hole by moving it in the axial direction while being fitted to the connecting member and rotating from the axial direction of the connecting member A cutting tool,
A tool body having an inner diameter to be fitted to the connection member;
A cutting blade provided so that the cutting edge protrudes from the direction orthogonal to the axial direction of the tool body toward the inner surface of the tool body,
The cutting edge of the cutting blade protrudes from the inner surface of the tool body so as to be orthogonal to the axial direction at least by a protruding amount corresponding to the tube thickness from the outer surface to the inner surface of the connection member. A cutting tool for the end of a closed pipe in a connecting method for members. The tool main body is formed in a cylindrical shape having one end opened and the other end closed, and an inner diameter reaching the one end opening side of the part to which the cutting blade is attached is an outer side of the connection member. The inner diameter that reaches the closed end side is formed to be substantially the same diameter as the inner diameter of the connection member,
3. The closed pipe in the connection method for a newly installed pipe member according to claim 2, wherein an engaging portion for releasably connecting to a rotary drive is provided on an axis of the closed end portion. End cutting tool.   The said tool main body is equipped with the window hole for discharging a chip in a surrounding wall, The cutting tool of the closed pipe end part in the connection method of the newly installed piping member of Claim 2 or Claim 3 characterized by the above-mentioned.

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