JP2018076960A - Construction method of branch pipe end part and device, connection method to building piping and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method of a branch pipe end part that reduces the probability of broken branch pipe during building construction work or outdoor facility construction work, when connecting building piping to a gas branch pipe which is drawn to a building site and buried, by making the length of the gas branch pipe as short as possible without boring public roads, making the squeeze work unnecessary.SOLUTION: A construction method of a branch pipe end part in which a socket part 10A into which a pipe end part of a branch pipe 50 is inserted at one side and a connection pipe part 10B to which a service tee joint for connecting to the building piping is connected to the other side, the method comprises: connecting a closing joint 10 having a closing wall 16 for blocking the gas flow provided in the connection pipe part 10B to a pipe end part of the branch pipe 50.SELECTED DRAWING: Figure 4

Description

  The present invention may be a fluid pipe such as a gas pipe, a water pipe, a sewer pipe or the like buried in the road side (public road) (in the present invention, these may be referred to as a gas pipe, as well as a gas such as city gas, A construction method for closing a pipe end portion of a branch pipe that is branched from a main pipe of a main pipe and buried in a residential land, and is also used in the method. The present invention relates to a method and an apparatus for connecting a closed pipe end and a gas pipe (hereinafter sometimes referred to as building piping) piped to a building, which are performed at the time of piping work for construction work.

  When building a new residential land, the land is first sorted and the public road that serves as the attachment road is developed before moving to building construction. Buildings require various living infrastructure such as water, city gas, and sewerage, but fluid pipes such as water and city gas conduits and sewer pipes are usually buried in public roads prior to building construction. A branch pipe is branched from the main and drawn into the residential land and buried in advance.

  FIG. 14A is a schematic diagram showing a city gas branch pipe 100 that is buried from a road side (public road) to a predetermined portion in a residential land. At the stage of residential land development, the floor area and shape of the building to be constructed may not be determined, and as shown in FIG. 14A, the gas branch pipe 100 extends from the public road to a predetermined part in the residential land (for example, It is pulled in (1,000mm from the site boundary) and buried in advance.

  A polyethylene pipe is usually used for the gas branch pipe 100 drawn in advance into the residential land. When the gas pipe is closed, a cap 102 is fitted to the pipe end of the branch pipe 100 to block the gas flow. Keep it. After that, the specifications of the building are determined, and piping work such as gas pipes is performed with the progress of the building work. The connection with the branch pipe 100 drawn in advance in the residential land at that time is shown in FIG. As shown in FIG. 2, in a state where the branch pipe 100 is squeezed and closed, an appropriate place from the squeeze part to the pipe end is cut, and thereafter, connection work with a gas pipe piped to the building is performed.

  When connecting the branch pipe 100 drawn into the residential land and the building piping, as shown in FIG. 14A, if the gas branch pipe 100 is drawn into the residential land by about 1,000 mm (1 m), the squeeze Since it is possible to secure a space for performing construction, it is possible to perform connection work with building piping in the residential land, and there is no need to excavate public roads. Excavation of public roads requires adjustments with relevant places and re-paving after excavation, which contributes to the extension of the construction period, so it is desirable to avoid it as much as possible.

  When there is an existing building, the old building is often demolished with the gas branch pipe connected to the building piping remaining in the residential land. At that time, the gas branch pipe is closed with a cap on the cut end as in the case of the residential land creation described above, but there is some allowance for reconnecting with the building piping after that. It is a precondition for eliminating the need for excavation of public roads to leave the dimensions in the residential land.

  That is, as shown in FIG. 14 (c), when the length of the branch pipe 110 drawn into the residential land is not enough, for example, about 0.4 m, it is necessary to secure a squeeze space and excavate the public road. Forced to increase costs and delay construction schedules.

  Conventionally, a tube obturator described in Japanese Patent Application Laid-Open No. 2008-281070 is known in order to cope with such a problem. The tube obturator described in the publication includes a seal portion formed in a substantially cylindrical shape, a support rod provided with a flange portion that comes into contact with one end of the seal portion, a biasing means for compressing the other end side of the seal portion, and the like. Configured.

  According to this publication, the connection with the building pipe is connected to the gas pipe embedded in the residential land via the socket joint, and then the pipe obturator in the branch pipe is pulled out and moved to the connecting pipe. The connection pipe is squeezed between the socket joint and the pipe obturator, and in this state, the pipe obturator is pulled out from the connection pipe, and then the building pipe is connected to the connection pipe via the socket joint. After that, the squeeze is released, and even if there is no room in the length of the gas branch pipe in the residential land, the tube obturator is inserted and installed in the gas pipe on the residential land side from the vicinity of the boundary of the residential land. Therefore, when connecting to building piping, it is possible to work only on the residential land side, there is no need to excavate public roads, and it is said that work plans such as housing construction can be made freely .

JP 2008-281070 A

  As described above, the drawing amount of the gas branch pipe 100 in the residential land in FIG. 14A is determined in consideration of the length necessary for squeezing the polyethylene pipe and the length necessary for the construction work with the building pipe. Is done. When the amount of drawing into the residential land is large, there is a problem that there is a high possibility that the gas branch pipe 100 will be broken when a building construction or exterior construction work to be performed later is performed. For this reason, it is desirable that the pulling of the gas branch pipe 100 into the residential land should be as short and as possible as possible. On the other hand, if the amount of drawing into the residential land is small, it is difficult to work only in the residential land as described above, and the public road must be excavated, resulting in cost increase and construction delay.

  In addition, when demolishing an existing building and removing it with piping, the gas branch pipe is not removed completely from the residential area, but only the required length remains in the residential area, and public road excavation work is performed when constructing a future building. It is preferable not to perform the process, because it leads to cost reduction at the time of reconnection and shortening of the work period.

  Furthermore, in the case of the tube closure described in the above-mentioned Japanese Patent Application Laid-Open No. 2008-281070, it is necessary to squeeze the connection pipe after connecting the connection pipe to the gas branch pipe via a socket joint. In addition, there was a problem that the structure of the tube obturator itself was complicated

  The present invention has been proposed to deal with such various situations, and its first object is to shorten the length of the gas branch pipe embedded in the residential land as much as possible prior to residential construction, In addition, when removing existing building piping, it is possible to shorten the gas branch pipe that is drawn into the residential land to a reusable length as much as possible, and when connecting to the building piping, An object of the present invention is to provide a construction method for closing the branch pipe end and an apparatus used in the method, which can eliminate the need for excavation work and can quickly and safely perform connection work with building piping.

The second object is to provide a construction method for closing the branch pipe end that can be easily and inexpensively handled even if the diameter of the gas branch pipe drawn into the residential land is different, and an apparatus used in the method. And
A third object is to provide a connection method and apparatus capable of quickly and safely performing connection work between a closed gas branch pipe and a building pipe without causing gas leakage.

  The invention according to claim 1 relates to a construction method for achieving the first object, and is a branch pipe buried in a public road, branched from a main pipe through which fluid flows, and drawn into a residential land. A method for closing the end portion is characterized in that a closed joint made of a thermoplastic resin having a closing wall for blocking the flow of fluid is connected to the pipe end portion of the branch pipe.

  The invention according to claim 2 is an apparatus used in the invention according to claim 1, comprising a closure joint made of a thermoplastic resin connected to a pipe end portion of a branch pipe which is drawn into a residential land and embedded therein. The joint is integrally formed with a closing wall that blocks the flow of fluid.

  The invention according to claim 3 relates to a construction method for achieving the second object, and is a branch pipe buried in a public road, branched from a main pipe through which fluid flows, and drawn into a residential land. A method of closing an end portion, wherein a closing tube made of a thermoplastic resin having a closing wall that blocks the flow of fluid is connected to the branch pipe via a socket joint or an elbow joint.

  Invention of Claim 4 is an apparatus used by invention of Claim 3, Comprising: The socket joint or elbow joint made from a thermoplastic resin to which the pipe end part of the said branch pipe is inserted and connected to one side, It is formed by a thermoplastic resin closing tube provided with a closing wall that is inserted and connected to the other side of the socket joint or elbow joint and blocks the flow of fluid.

  The invention according to claim 5 relates to a connection method with a building pipe for achieving the third object, wherein the obstruction joint of the invention of claim 1 or the obstruction pipe of the invention of claim 3 is attached to a building. A method of connecting pipes, the step of connecting a branch joint to the block joint or block pipe, the step of connecting a building pipe to the branch joint, and the block joint or block pipe through the branch joint through a cutting tool. The step of cutting the closing wall and the passage through which the cutting tool of the branch joint is passed in the state where the cutting tool that cut the closing wall is retracted and fluid can flow from the branch pipe to the building piping through the branch joint. And a step of preventing outflow.

  Invention of Claim 6 is an apparatus used by invention of Claim 5, Comprising: While being connected to the said obstruction | occlusion joint or an obstruction pipe, the branch joint connected to building piping, and the channel | path provided in this branch joint And a cutting tool for cutting the closing wall of the closing joint or closing tube, and closing means for closing the passage.

  According to the present invention, when the construction work is performed in the residential land, the squeeze work of the branch pipe becomes unnecessary. As a result, the pull-in length of the branch pipe into the residential land can be shortened and the amount of work required for the construction work of the building pipe is reduced. It becomes possible to do. In addition, the shortening of the pull-in length of the branch pipes can greatly reduce the probability of breaking the branch pipes during other constructions such as building construction and exterior construction, shortening the construction period, building There is an effect that the degree of freedom of design increases.

  When connecting a closed joint to a branch pipe, if the diameter of the branch pipe is different, it is necessary to use a joint having a socket portion of a size suitable for the diameter of the branch pipe. Of the socket parts on both the left and right sides, if a closed joint with a different diameter is used for only one socket part into which the branch pipe is inserted, the branch joint connected to the closed joint is the same even if the diameter of the branch pipe changes. A joint can be used, but for a closed joint, a plurality of types of joints with a special structure having a closed wall must be facilitated according to the size of the branch pipe. In this regard, as in the inventions of claims 3 and 4, if a joint with a different diameter is used for the socket joint or the elbow joint and the closing pipe is connected to the socket joint or elbow joint with a different shape, the socket joint or elbow Existing joints with different diameter sockets or elbow joints can be used for the joints, and the closed pipes need only be closed walls, for example, blind pipes that are closed with a lid, and are easy to manufacture. It is possible to deal with it more easily and cheaply than manufacturing a joint with a special structure provided with

  In addition, by using a branch joint and moving the cutting tool passed through the branch joint forward and backward, it is possible to cut the closing wall of the closing joint or closing pipe, and the passage through which the cutting tool advances and closes can be blocked by the cutting tool and sealed. Thus, fluid leakage from the passage can be prevented, and building piping can be connected quickly and safely.

The front view of the closure joint concerning one embodiment of the present invention. Sectional drawing in the II-II line of FIG. The left and right view of the obstruction joint shown in FIG. Sectional drawing of the obstruction | occlusion joint connected to the branch pipe. Sectional drawing of the obstruction | occlusion joint of another aspect connected to the branch pipe. The figure which shows the operation | work procedure at the time of connecting a service Q joint to a closure joint. The figure which shows the operation | work procedure after connecting a service Q joint to a closure joint. Schematic which shows the state which connected building piping to the obstruction joint via the service chi joint. Schematic of a branch pipe that is buried from the road side (public road) to the residential land and has a closed joint. The figure which shows the aspect which attached the obstruction pipe to the branch pipe via the socket joint of a different diameter. The figure which shows the aspect which connected the service Q joint to the obstruction pipe. The figure which shows the aspect which attached the obstruction pipe to the branch pipe via the elbow joint of a different diameter. The figure which shows the aspect which connected the service Q joint to the obstruction pipe. Schematic which shows the conventional construction method of the branch pipe which is drawn in from the road side (public road) to the residential land and embeds.

DESCRIPTION OF EMBODIMENTS Embodiments relating to a construction method for closing a gas branch pipe end portion that is drawn into a residential land and embedded therein and a closure joint constituting an apparatus used in the method will be described below with reference to the accompanying drawings.
1 is a plan view of a closure joint according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1, FIG. 3 is a left and right side view of the closure joint, and FIG. It is sectional drawing which shows the state which connected the branch pipe of a certain gas pipe to the obstruction | occlusion joint of this embodiment.

  The closure joint 10 is formed into a pipe shape from a thermoplastic resin, preferably polyethylene, and has a socket 10A on one side and a connecting pipe 10B communicating with the socket 10A on the other side. As shown in FIG. 2, a closing wall 16 is integrally formed in the connecting pipe portion 10B.

As shown in FIGS. 2 and 4, a heating wire 12 is built in the inner peripheral surface of the socket portion 10A, and a heating wire is applied by applying a voltage from a pair of terminals 11A and 11B provided in the socket portion 10A. 12, the inner peripheral surface of the socket portion 10A is heated, and a polyolefin, preferably polyethylene, branch pipe 50 inserted into the socket portion 10A is fusion bonded to the socket portion 10A (so-called electrofusion EF bonding). ).
Further, a concave portion 10C having a diameter slightly larger than the inner diameter L1 is formed along the inner peripheral wall on the inner side of the socket portion 10A, and a sealing O-ring 14 for maintaining airtightness is formed in the concave portion 10C. It is arranged.

  As shown in FIG. 4, when the branch pipe 50 is inserted into the socket portion 10A, the entire circumference of the end portion 50A of the branch pipe 50 is in close contact with the inner side of the O-ring 14, and thereby the socket portion 10A. The space between the inner wall and the inner wall is sealed to maintain airtightness. For this reason, even if city gas circulates through the branch pipe 50 at the time of fusion bonding, the inner peripheral wall surface of the socket portion 10A to which heat is applied is not exposed to the gas atmosphere, and the branch pipe 50 can be safely connected to the joint. 10 can be connected. At the time of fusion bonding here, the fusion part is sufficiently cleaned, cut, and inspected after work so that no gas leaks from the joint.

  As shown in FIG. 1 to FIG. 4, the inner diameter L2 of the connecting pipe portion 10B is formed smaller than the inner diameter L1 of the socket portion 10A, and blocks the gas flow to the opposite side of the socket portion 10A. A closing wall 16 is provided. In the illustrated example, the closing wall 16 is formed at the end of the connecting pipe portion 10B, but the center of the connecting pipe portion 10B and the opposite end, and further up to a limit that does not cause melting by the heating wire 12. It can also be provided close to the heating wire 12. For example, a later-described branch joint such as a service tee joint or a T-shaped cheese joint, or a joint such as a socket joint or an elbow joint is connected to the connection pipe portion 10B.

  In the state shown in FIG. 4, the branch pipe 50 is buried in the soil in a state where the branch pipe 50 is connected to the socket part 10 </ b> A of the closing joint 10 by the above-described fusion bonding. It is desirable to cover the connecting pipe portion 10B so as not to get dirty.

  With this configuration, when the closure joint 10 according to the present embodiment is used, a squeeze operation for closing the branch pipe 50 that has been required in the past is not required in connection work with building piping. As a result, the pipe length in the residential land necessary for connecting the building piping can be shortened, so that the pull-in amount of the branch pipe 50 embedded in the residential land can be significantly reduced. For this reason, when performing exterior construction or building construction, the probability of breaking the branch pipe 50 can be greatly reduced.

  Furthermore, since the obstruction take-off joint 10 of the present embodiment has a socket portion 10A and a connecting pipe portion 10B that communicate with each other in a straight tube shape and is substantially free of protrusions when embedded in the soil, When performing construction, it is possible to reduce the probability of damage and prevent breakage. In addition, when connecting with building piping, it is no longer necessary to squeeze and cut the branch pipe 50 as in the conventional case. This eliminates gas leakage completely and allows safe operation and installation of new piping. The amount of work required for this can be reduced.

  The above-described closing joint 10 is a straight pipe type socket joint in which the socket portion 10A and the connecting pipe portion 10B are formed in a straight line, but is not limited to this, and a socket joint having socket portions on both the left and right sides, or a socket As long as it has the socket part 10A and the connecting pipe part 10B to which the branch pipe 50 is connected, or the socket part on both sides, such as an elbow joint in which the socket part on both sides and the socket part on both sides are formed in an L shape Such a joint may be used. That is, the closure joint of the present invention includes a socket part connected to the branch pipe 50 and a connection pipe part or socket part connected to the building pipe, and the closed wall 16 that blocks the flow of fluid in the pipe line. If it is provided, the shape and structure are not limited.

  FIG. 5 is a cross-sectional view showing a joint 32 in which the above-described closure joint 10 is partially changed with respect to its configuration. As shown in the drawing, an O-ring 34 as an annular member is attached to the closure joint 32 at the root of the connection pipe part 32B between the socket part 32A and the connection pipe part 32B. When the connecting cap 32B is covered with the above-described protective cap, the inner peripheral surface of the protective cap and the O-ring 34 are in close contact with each other to be sealed and airtight. Further, the same effect can be obtained when a branch joint such as a service tee joint is connected to the connection pipe portion 32B. Here, the same reference numerals are given to the same structural portions as those of the aforementioned closed joint 10.

  Next, the process in the case of connecting building piping using the closure joint 10 of this embodiment is demonstrated. FIG. 6 is a diagram showing a procedure for connecting the service tee joint 20 as a branch joint to the connecting pipe portion 10B of the closure joint 10 of the present embodiment, and FIG. 7 is a cutting tool through the trunk portion 20C of the service tee joint 20. FIG. 8 is a schematic view when a building pipe is connected to a closing joint using a service Q joint.

  As shown in FIG. 4, the branch pipe 50 drawn into the residential land is kept closed by the closure joint 10, and when the service pipe joint is connected to the branch pipe 50 and connected to the building pipe, Construction will proceed as follows.

  The service tee joint 20 includes a connection port 20A to be inserted into the connection pipe 10B of the closing joint 10, a trunk portion 20C having a screw portion 20B having a thread on the opposite side, and a trunk portion orthogonal to the trunk portion 20C. The spigot 20D branches off from the section 20C and is connected to a building pipe, which will be described later. The connection port 20A has a heating wire (not shown) built in the inner peripheral surface thereof, like the socket section 10A of the closure joint 10, and a terminal 22A. , 22B to heat the inner peripheral surface of the connection port 20A with a heating wire, and as shown in FIGS. 6A and 6B, the connection port 20A of the service joint 20 and the The connection pipe portion 10B of the closing joint 10 inserted into the connection port 20A is fusion bonded.

  A cap 24 that can be opened and closed is screwed into the screw portion 20B on the side opposite to the connection port 20A. After the fusion bonding of the service Q joint 20 and the joint 10 as shown in FIG. The cap 24 is removed, and then the tapping tool 26 is attached to the screw portion 20B as shown in FIG. 7B.

  As shown in FIG. 7B, the tapping tool 26 is screwed onto the outer periphery of the screw portion 20B of the service tee joint 20, and a screw rod 26B that is rotated by the operation of the handle 26A is attached to the tool 26. It is screwed onto the axis line. A cutter 21 (see FIG. 7B) that constitutes a cutting tool together with a tapping tool 26 is mounted inside the tubular screw portion 20B, and the cutter 21 is disk-shaped and faces the connection port 20A. On the side surface, a blade for cutting the closing wall 16 is provided over the entire circumference at the periphery having the same diameter as the closing wall 16. The cutter 21 incorporated in the screw portion 20B can also advance and retreat in a state where the tubular passage in the screw portion 20B is in close contact with the inner peripheral surface of the screw portion 20B and the passage is closed, thereby closing the passage. As a closing means, gas leakage from the screw portion 20B is prevented.

  After the tapping tool 26 is attached to the outer periphery of the screw portion 20B as shown in FIG. 7B, the screw rod 26B is screwed by rotating the handle 26A and the tip of the screw rod is screwed to the axis of the cutter 21. Connect it together. After the connection, the handle 26A is still rotated and the screw rod 26B is continuously screwed in. The cutter 21 is pushed into the closing wall 16, and the cutting wall 16 is cut or turned or a combination of the two is used to cut the closing wall 16. Do. When the closing wall 16 is cut, the closed state of the branch pipe 50 is released, and the gas can flow from the branch pipe 50 to the service joint 20.

  Thereafter, the handle 26A is rotated in the reverse direction, the screw rod 26B is moved back together with the cutter 21, and the passage of the screw portion 20B is closed with the cutter 21 that has reached the passage of the screw portion 20B. After the screw portion 20B is closed and sealed with the cutter 21, the screw rod 26B is removed from the cutter 21 by hand operation, and then the tool 26 is removed from the screw portion 20B, and then the cap 24 is screwed into the screw portion 20B. Install.

  The cutter 21 is embedded in the screw portion 20B and is buried, but after the step described in the paragraph number (0042), a sealing bag is put on a required portion of the service Q joint 20 including the screw portion. The cap 24 and the cutter 21 may be manually inserted into the bag while preventing gas leakage, and then the cap 24 may be screwed into the screw portion 20B for attachment. In this case, the cap 24 serves as closing means for closing the passage of the screw portion. The removed cutter 21 can be reused.

  FIG. 8 shows a mode when building piping is connected to the service joint 20 connected to the closure joint 10 as shown in FIG. 7, and the pipe 30 of the building piping is connected to the spigot 20D of the service joint 20 as an elbow joint. 28 are connected.

  In the embodiment, the closing joint 10 is a straight pipe type in which the socket part 10A and the connecting pipe part 10B are linearly connected, but the socket part 10A and the connecting pipe part 10B are bent pipe type elbow joints. It may be configured.

  In the above embodiment, the service tee joint 20 is illustrated as a branch joint connected to the closure joint 10, but instead of the service tee joint 20, for example, a T-shaped cheese joint provided with socket portions or connection ports on both right and left sides is used. It can also be used. In the case of this cheese joint, a threaded portion similar to the threaded portion 20B of the service tee joint 20 is provided in the center, and a tapping tool 26 is attached to the threaded portion in the same manner as in the above embodiment. It is preferable to screw 24B and push a built-in cutter into the threaded portion so as to cut the closing wall in the same manner as in the above embodiment.

  FIG. 9 is a schematic cross-sectional view showing the relationship between the closed joint 10 of the present embodiment embedded in the residential land before construction and the city gas branch pipe 50, and FIG. 9 (a) is in the residential land from the road side. FIG. 9B shows a branch pipe 50 used in an area where the burial depth is deep.

  When the closure joint 10 of this embodiment is used, as shown in FIG. 9A, the closure joint 10 can be embedded in a portion separated by about 0.1 m from the public road side. Further, as shown in FIG. 9B, when the embedment depth is deep, the closure joint 10 of the present embodiment can be directly connected to the raised branch pipe 54 and embedded as it is.

  Although the branch pipe 50 shown in FIG. 9B is bent upward in the residential land in the illustrated example, an elbow joint can be used instead of bending, and the closure joint 10 shown in FIG. Instead, the above-mentioned elbow joint provided with a closing wall may be used to raise the branch pipe 50.

  According to the closure joint 10 of the present embodiment, it is possible to greatly reduce the length of a branch pipe embedded in a residential land, and when performing construction work of a new pipe in the residential land even if the pipe length is shortened, a public road or the like Since it is not necessary to excavate the installation road, installation work for the new pipe can be easily and quickly performed.

  In addition, according to the closure joint 10 of the present embodiment, after the service joint 20 is fusion-bonded and the building pipe is connected via the joint 20, the entire piping facility can be subjected to pressure and airtight inspection. However, since the branch pipe 50, the closing joint 10, and the service tee joint 20 have high airtightness, it is possible to improve the accuracy of the airtightness test, and the subsequent cutting operation can be performed safely.

  When the diameter of the branch pipe 50 drawn into the residential land changes, the closure joint 10 of the embodiment must be replaced with a closure joint having a socket part of a size suitable for the branch pipe 50, and has a socket part that matches the diameter of the branch pipe 50. It is necessary to prepare the closing joint 10. Moreover, in the situation in residential land, it may be preferable to connect a joint (for example, elbow joint) other than the socket joint to the branch pipe 50. In this case, it is desirable to prepare the closure joint 10 having each shape. Since the closure joint 10 has a special structure including the closing wall 16, the production of the closure joint having a different diameter or shape must be replaced with a mold, resulting in high cost.

  FIG. 10 shows an embodiment for solving the problem that the diameters of the branch pipe 50 and the socket part of the closure joint 10 inserted into the branch pipe 50 are different, and the diameter of the branch pipe 50 drawn into the residential land. If the above-mentioned closure joint 10 cannot be adapted to the socket part 10A, the socket joints 41A and 41B on the left and right sides of the socket joints 41 having different diameters are different in size and fit to the diameter of the branch pipe 50. A socket joint 41 having a socket part 41A is used (the diameter of the socket part 41B is the same. Therefore, the diameter of the socket part 41A is smaller than the diameter of the socket part 41B), and the branch pipe end is inserted into the socket part 41A and melted. After the joining, the closing tube 42 is inserted into the other socket part 41B and fusion-bonded. It is also possible to insert the closing tube 42 into the socket portion 41B, and fuse and join together to insert the branch tube end portion into the socket portion 41A for fusion bonding. The closing tube 42 is a short tube made of the same material as the socket joint 41 and has a blind tube structure in which a lid 43 functioning as a closing wall is fixed and closed at one end. On the contrary, when the diameter of the branch pipe 50 is large, a socket joint 41 having a different diameter, that is, the diameter of the socket part 41A that matches the diameter of the branch pipe 50> the diameter of the socket part 41B is used. Incidentally, when the diameter of the branch pipe 50 is the same, the standard socket joint 41 or the elbow joint 45 with the same diameter of the socket parts on both sides and the non-different diameter and the closing pipe 42 can be used in combination.

  Until the building is constructed, as shown in FIG. 10, the closed pipe 42 is embedded with a cap 44 covered. When construction is started in the residential land and construction work for building piping is performed and connection work with the blocking pipe 42 is performed, the residential road on the public road side is dug up to expose the blocking pipe 42, and then the cap 44 is removed from the blocking pipe 42. After the removal, the socket portion 20A of the service tee joint 20 is inserted into the closing tube 42 and fusion-bonded. After that, as in the above embodiment, the same cutting tool as that in the above embodiment is used for the threaded portion 20B of the service tee joint 20 from which the cap 24 has been removed. Perform cutting work.

  According to the present embodiment, the existing socket joint can be used as it is for the socket joint 41 having a different diameter, and the closing pipe 42 can be easily obtained by attaching the lid 43 to one end of the pipe, for example, by bonding. .

  As described above, the socket joint 41 has different diameters of the left and right socket parts 41A and 41B, and one socket part 41A into which the branch pipe 50 is inserted has a size corresponding to the diameter of the branch pipe 50. The portion 41B has a fixed size so that it can be adapted to the closed tube 42 having the same diameter. In the case where such a joint cannot be easily obtained with existing different diameter socket joints, for example, a stepped pipe having different diameters of the left and right pipe parts is used as the closing pipe 42, or a reducer joint having a different diameter is used. Good. As a result, it is possible to always use the service tee joint 20 having the same size.

  FIG. 12 shows another embodiment. Instead of the socket joint 41 of the above-described embodiment, an elbow joint 45 having a different diameter of the socket portions on both sides is used, and the branch pipe is similar to the socket joint 41 of the above-described embodiment. The socket part 45A on one side of the elbow joint 45 is inserted into the end part and fusion-bonded. After the closure pipe 42 is connected to the socket part 45B on the other side, the closure pipe 42 is covered with the cap 44 and connected to the building piping. Keep it buried until When connecting to the building pipe, the service tee joint 20 is connected to the closing pipe 42 (FIG. 13), and the cutting operation of the closing pipe 42 to the lid 43 is performed in the same procedure as in the previous embodiment. .

  In each of the above-described embodiments, the case where it is mainly used as a joint for city gas has been described. However, the present invention is not limited to this and can be used with various fluid joints such as water and gas.

  The present invention can be used in the gas supply field, the water supply business, or the business field of building-related facilities such as housing facilities and water supply / drainage.

10 32 closure joint
10A, 32A Socket part
10B, 32B Connecting pipe part
11A, 11B terminal
12 Heating wire
14, 34 O-ring
16, 36, 43 Closed wall
20 Service Qi fittings
20A connection port
20B Screw part
20C trunk
20D spigot
22A, 22B terminal
24 cap
26 Tapping tool
30 tubes
50, 52, 54 Branch pipe
41 Socket Fitting
42 Occlusion tube
45 Elbow fitting

Claims (6)

It is a construction method that is buried in a public road, branches off from the main pipe through which the fluid circulates, and closes the pipe end of the branch pipe that is drawn into the residential land and buried,
A construction method characterized by connecting a closed joint made of a thermoplastic resin provided with a closing wall for blocking the flow of fluid to the pipe end of the branch pipe. An apparatus used in the construction method according to claim 1,
It consists of a closure joint made of thermoplastic resin connected to the pipe end of a branch pipe that is drawn into the residential land and embedded therein, and the closure joint is integrally formed with a closure wall that blocks the flow of fluid. Device to do. A method of burying in a public road, branching off from a main pipe through which fluid flows, and closing a pipe end of a branch pipe that is drawn into a residential land and buried,
A closing method, comprising: connecting a closed pipe made of thermoplastic resin having a closing wall that blocks fluid flow to the branch pipe via a socket joint or an elbow joint. An apparatus used in the construction method according to claim 3,
A thermoplastic resin socket joint or elbow joint that is inserted and connected to one side of the pipe end of the branch pipe, and is inserted and connected to the other side of the socket joint or elbow joint to block fluid flow. An apparatus comprising an obstructing tube made of a thermoplastic resin having a closing wall. A method for connecting a building pipe to the closure joint according to claim 1 or the closure pipe according to claim 3,
Connecting a branch joint to the closure joint or the closure pipe, connecting a building pipe to the branch joint, cutting a closing wall of the closure joint or the closure pipe through a cutting tool through the branch joint, and closing A step of retracting the cutting tool after cutting the wall and preventing the fluid from flowing out from a passage through which the cutting tool of the branch joint is passed in a state in which the fluid can flow from the branch pipe to the building piping through the branch joint; A connection method characterized by comprising: An apparatus used in the connection method according to claim 5,
A branch joint that is connected to the block joint or block pipe and connected to a building pipe, and is inserted into a passage provided in the branch joint so as to be able to advance and retreat, and for cutting the blocking wall of the block joint or block pipe An apparatus comprising a cutting tool and a closing means for closing the passage.