JP4274908B2 - End structure of pipe member and end connection method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to an end structure of a piping member and an end connection method, and in particular, an end of a piping member for connecting a new piping end to a terminal end of an existing upstream pipe or a connecting end of a branch joint. The present invention relates to a part structure and an end connection method.

  When installing a new pipe on the downstream side of an existing distribution pipe such as a gas pipe, shut off the upstream side of the existing pipe, and then connect a branch joint (referred to as a service team in the gas pipe) to the downstream side. In general, a method of connecting a new pipe to the connection end of the branch joint is used.

  On the other hand, pipes buried underground often have different asset categories for pipes depending on the land ownership. For gas pipes, for example, pipes buried under public roads are assets of a gas company. However, the pipes buried in the private land adjacent to the public road become the property of the individual landowner. Therefore, when branching from a pipe under a public road and piping in a private area, the asset classification of the pipe will change on the boundary between the public road and the private area. When extending to the downstream side, there will be a situation where the construction contractor and the construction period differ for each asset category, and the pipes laid from the upstream side are once separated near the ground and the end is shut off separately. The succession construction which connects a new piping to the edge part will be performed.

  In addition, if it is expected that the pipe will be extended from the upstream side to the downstream side regardless of the situation of such asset classification, the pipe will be provided halfway or a branch joint will be connected in advance. In some cases, these end portions are shut off once, and new pipes are connected to the end portions after appropriate.

  FIG. 1 is an explanatory view illustrating a conventional method for connecting a new pipe to a terminal end of a pipe or a connecting end of a branch joint, using a gas pipe as an example. According to this, first, with respect to a pipe 1A whose end is sealed with a sealing cap 2 such as a fusion cap or a removable cap, a blocking bag 3A is formed from a perforation 1a formed slightly upstream from the connecting portion. , 3B is inserted to shut off the gas (FIG. 5A), the sealing cap 2 is removed, and the end of the new pipe 1B is connected to the end via the joint 4 (FIG. 5B). After that, the blocking bags 3A and 3B are removed, and the perforation 1a is stopped with the stopper 5 ((c) in the figure). In this way, gas is supplied to the downstream side by connecting a new pipe to the upstream pipe end (see Patent Document 1 below).

JP2003-278987

  According to such a conventional construction method, it is necessary to insert a shut-off bag in the vicinity of the end portion of the upstream pipe at the time of connection. Therefore, a working space having a length L necessary for that purpose must be secured. Then, in order to perform connection work in the vicinity of the land boundary in the above-mentioned land ownership classification, the pipe end portion for the length L is in the downstream land (the private land on the public road and private land). From the standpoint of the upstream pipe owner, extra pipe construction is forced. Moreover, since the work is carried out in the land owned by another person, there arises a disadvantage that a work plan cannot be made freely.

  Furthermore, if a pipe end with a considerable length L (about 1 m for general gas supply piping) is embedded in the land section on the downstream side and buried, the pipe end will be used during various construction works on the land. There is a possibility of being damaged, which is not preferable in terms of security.

  Also, considering the process at the site of connecting a new downstream pipe to the upstream pipe end without considering the problem of land ownership classification or pipe asset classification, the upstream side After sealing the end of the pipe with a shutoff bag, it is necessary to connect the pipe, and then remove the shutoff bag to open the pipe, so it takes time to insert and remove the shutoff bag. There is a problem that the process becomes complicated.

  The present invention has been proposed to deal with such a situation, and is an end structure or end portion of a pipe member for connecting a new pipe end portion to an end portion of an existing existing pipe member on the upstream side. The connection method eliminates the need for a blocking bag for blocking the upstream piping member, saves work space at the upstream piping member end, reduces entry of the end from the ground to the downstream side, and downstream The purpose is to simplify the work at the site when connecting a new pipe.

  In order to achieve such an object, the present invention has the following features.

  For one, in the end structure of the piping member for connecting a new piping end to the end of the existing existing piping member on the upstream side, an airtight membrane for blocking the end is formed in the end of the piping member. The hermetic membrane is provided and can be removed by being broken linearly through a removal hole formed in the connecting portion after the connection.

  Moreover, in the end structure of the piping member described above, the airtight film is composed of a spiral non-breaking portion and a thin breakage portion formed between the non-breaking portions, and a central portion of the airtight film. A tip of a removal operation string drawn out of the pipe through the removal hole is fixed to the non-breaking portion in FIG.

  In addition, in the end structure of the piping member described above, the thickness of the fracture portion is thinner as it is closer to the central portion, and is thicker as it is closer to the inner surface of the piping member.

  Moreover, in the end structure of the piping member described above, the airtight film is provided with a spiral non-breaking wire, and at the tip of the non-breaking wire at the center of the airtight film, The tip of the removal operation string drawn out of the pipe through the removal hole is fixed.

  In addition, in the above-described end structure of the piping member, the piping member is a resin material, and the airtight film is integrally formed with the piping member.

  In addition, in the end structure of the pipe member described above, the pipe member is a short pipe connected to an upstream pipe or a branch joint.

  Moreover, in the end structure of the piping member described above, the piping member is a branch joint.

  Moreover, in the end structure of the piping member described above, the airtight film has a pressure resistance against an airtight test after the piping member is laid.

  Moreover, in the end structure of the piping member described above, a conical protective cap is provided at the tip of the piping member in order to drive the end into the wall surface of the construction section when buried. And

  Further, in the pipe member end connecting method for connecting a new pipe end to the end of the existing existing pipe member on the upstream side, the end is sealed by a hermetic membrane that can be broken and removed linearly. A step of connecting a pipe end on the downstream side to the end of the pipe member via a connection part having a removal hole, and pulling out a removal operation string whose tip is fixed to the airtight membrane from the removal hole; and the removal operation And pulling a string to remove the airtight membrane that has been broken linearly from the removal hole, thereby opening the pipe member on the upstream side and the pipe end on the downstream side. To do.

  Further, in the pipe member end connecting method described above, when the pipe member is embedded prior to each step, a conical protective cap is attached to the tip of the embedded member, and the tip is attached to the wall of the construction section. It is characterized by driving.

  According to the present invention having such characteristics, the following effects can be obtained.

  For example, an airtight film is provided at the end of the upstream pipe member, and the end is blocked in advance, and after the downstream end of the pipe is connected to the end of the pipe member, By removing the membrane from the removal hole formed in the connection portion in a linear shape, it is possible to open the downstream pipe, so there is no need to insert and remove the blocking bag in the connection work on site, The work is simplified, and the end space of the piping member for inserting the blocking bag becomes unnecessary. Therefore, in the connection work near the boundary in the land ownership classification of the buried piping, the length of the end of the upstream piping member entering the downstream land can be made as short as possible.

  As a result, even when laying underground pipes for each land ownership category, the length of the end that enters the other person's land on the downstream side is shortened. In addition to avoiding damage, it is possible to end the work by shutting off the pipe end in the own land ownership section, so that the work plan can be made freely.

  The hermetic membrane provided at the end of the piping member is composed of a spiral non-breaking portion and a thin breakage portion formed between the non-breaking portions, and through the removal hole to the non-breaking portion in the central portion of the airtight membrane. Since the tip of the removal operation string drawn out of the pipe is fixed, by pulling the removal operation string from the outside of the pipe, it can be broken linearly from the center and removed from the removal hole to the outside of the pipe.

  In addition, the thickness of the fractured portion in the airtight membrane is made thinner as it is closer to the center and thicker as it is closer to the inner surface of the piping member, so that it becomes easier to break linearly from the center and the airtightness that is performed after the piping member is laid. The stress acting on the hermetic membrane during the test can be effectively received in the thick part of the peripheral part.

  As another form of the hermetic membrane, a spiral non-breaking wire is provided in the hermetic membrane, and the tip of the removal operation string drawn out of the pipe through the removal hole is provided at the tip of the non-breaking wire at the center of the hermetic membrane. In the case of the fixed one, the hermetic membrane can be similarly broken from the center in a linear fashion and removed from the removal hole.

  Moreover, a piping member which has an airtight film | membrane can be formed cheaply and easily by forming a piping member with a resin material and shape | molding an airtight film | membrane integrally with this piping member.

  The piping member may be the upstream piping itself or a short piping connected to the upstream piping or the branch joint. Or it is a branch joint, Comprising: The airtight film | membrane as mentioned above may be provided in the edge part. In accordance with various forms, it is possible to form a successor to which a downstream pipe end is connected at a necessary location.

  In addition, since the airtight film of the piping member described above has a pressure resistance against the airtight test after the piping member is laid, after the upstream end is formed by the piping member, the upstream side is once upstream It is possible to confirm the safety by performing an airtight test. As a result, it is possible to ensure the safety of the upstream piping even during the period until the subsequent construction is performed.

  In addition, when the upstream piping member described above is buried up to the end of the construction section prior to the preparatory work, a conical protective cap is attached to the end of the piping member, and this wall is attached to the wall of the construction section. Drive the tip. By attaching the protective cap, the hermetic membrane can be protected from external pressure such as earth pressure, and can be easily driven into the wall surface. Further, in the subsequent succession work, the tip of the upstream piping member is exposed only by excavating adjacent work sections, so that the excavation area during the previous work can be minimized.

  And according to the end part connection method using such a piping member, when connecting a new pipe end part, the work in the field is simplified and construction time can be shortened.

  According to such a feature, as described above, in the end structure or the end connection method of the pipe member for connecting a new pipe end to the end of the existing existing pipe member on the upstream side, the upstream pipe member Eliminates work space at the end of the upstream piping member, eliminates entry of the end from the ground to the downstream side, and connects the new piping on the downstream side. It is possible to simplify the work in

  Embodiments of the present invention will be described below with reference to the drawings. Here, a gas supply pipe as an existing pipe will be described as an example, particularly an embedded gas supply pipe branched from an upstream gas conduit and piped to each consumer on the downstream side. Is not particularly limited to this, and can be applied to water and sewage piping, fluid distribution piping in a plant, and the like.

  Drawing 2 is an explanatory view explaining the end part structure of the piping member concerning the embodiment of the present invention. The pipe member 10 is provided with an airtight film 11 in an end portion thereof, and the gas flow on the upstream side can be blocked by the airtight film 11. Here, the piping member 10 may be a terminal portion of the gas supply pipe itself branched from the upstream gas conduit, or may be a terminal member connected to the end of the gas supply pipe. The distal end of the removal operation string 12 is fixed to the airtight film 11, and by pulling this, the airtight film 11 is broken into a linear shape and can be removed from the inside of the piping member 10. When this piping member 10 is laid, the airtight membrane 11 is protected by covering the tip thereof with a conical protective cap 20.

  FIG. 3 is a front view of the piping member 10 and shows a structural example of the airtight film 11. In this example, the airtight film 11 includes a spiral non-breaking portion 11A and a thin breakage portion 11B formed between the non-breaking portions 11A, and the removal operation is performed on the non-breaking portion 11A at the center of the airtight film 11. The tip of the string 12 is fixed.

  4 and 5 show cross-sectional views of such a piping member 10. As shown in FIG. 4, the non-breaking portion 11A of the airtight film 11 is formed by a slightly thick portion, and has a strength such that the non-breaking portion 11A is not divided in the middle. Further, the breaking portion 11B is formed to be thin, and is broken by a shearing force generated by pulling the removal operation string 12. The non-breaking portion 11A becomes a linear shape and is sequentially broken from the center of the airtight film 11. . The break portion 11B is formed in a V-groove shape to facilitate breakage due to a shearing force. A fixing portion 12A for fixing the tip of the removal operation string 12 is formed in the non-breaking portion 11A in the central portion of the airtight film 11.

  Such a piping member 10 can be formed of a resin material such as polyethylene, and in this case, the piping member 10 and the airtight film 11 can be integrally formed at a low cost. Here, of course, the airtight film 11 can withstand the gas flow pressure from the upstream side, but the pressure at the time of the airtight test performed after the piping member 10 is arranged at the upstream end of the existing pipe (normal gas) Withstand pressure strength sufficient to withstand about 1.1 to 10 times the flow pressure).

FIG. 5 shows an example of the structure of the hermetic membrane 11 (the same parts as those described above are denoted by the same reference numerals and a duplicate description is partially omitted). In this example, the film thickness of the fracture portion 11B is reduced as it is closer to the center, and is increased as it is closer to the inner surface of the piping member 10 (t ₁ <t ₂ <t ₃ <t ₄ <t ₅ ). According to this, the rupture portion 11B is easily broken in order from the center portion by pulling the removal operation string 12. In addition, when a high pressure during the airtight test is applied to the airtight film 11, the stress generated in the airtight film 11 increases in the vicinity of the periphery, so that it is effective as a structure that can withstand this.

  FIG. 6 is an explanatory view (sectional view) showing an end structure of a piping member according to another embodiment of the present invention. According to this embodiment, although the piping member 10 and the airtight film | membrane 11 are integrally molded by the resin material, it is the same as that of embodiment mentioned above, However, The structure of the airtight film | membrane 11 differs. In the airtight film 11 in this embodiment, a spiral non-breaking wire 11C is provided in the film. That is, a spiral non-breaking wire 11 </ b> C is insert-molded in the airtight film 11. A fixing portion 12A to which the tip of the removal operation string 12 is fixed is formed at the tip of the central portion of the airtight film 11 of the non-breaking wire 11C.

  According to this, the rupture portion 11B is substantially formed between the non-breaking wire 11C, and the rupture portion 11B is broken by pulling the removing operation string 12, and the airtight film is formed along the non-breaking wire 11C. 11 will be broken linearly. A cut groove may be provided in the break portion 11B formed between the non-break wires 11C so as to be easily broken by a shearing force.

  FIG. 7 shows another form of the piping member 10. As described above, the piping member 10 described here may be a terminal portion of the gas supply pipe itself branched from the upstream gas conduit, or a terminal connected to the end of the gas supply pipe. Although a member may be sufficient, as shown to Fig.7 (a), short piping connected to the connection part 30A of the branch joint 30 may be sufficient. Further, as shown in FIG. 5B, the connecting portion 30A itself of the branch joint 30 may be a piping member 10.

  FIG. 8 is an explanatory view showing an end connection method using such a piping member. First, as shown in FIG. 2A, the piping member 10 is provided at the terminal portion of the upstream piping. An example of a gas supply pipe branched from an upstream gas conduit and piped to a demand destination will be described as an example. A piping member 10 is provided at the end of a gas supply pipe branched from a gas conduit below a public road, and the public road and private The end of the piping member 10 is allowed to face the ground boundary.

  At this time, the piping member 10 provided at the end of the gas supply pipe is buried by excavating the public road side from the ground, and the protective cap 20 is installed in a state where the protective cap 20 is attached to the tip of the piping member 10. Driving into the side wall of the private land, once the public road side pipe laying work is finished. In this work, since the work is not performed beyond the land ownership division, the work can be smoothly performed, and the piping member 10 does not enter the private land side greatly. It is also possible to avoid damage to the piping member 10 due to other construction or the like.

  On the other hand, when performing piping work on the private side, after excavating the private side piping space, as shown in FIG. 5B, the tip of the piping member 10 is exposed to remove the protective cap 20, A new pipe end 40 to be piped on the downstream private side is made to face the end of the pipe member 10, and both are connected via a connection part 41 such as an electric fusion joint. At this time, a removal hole 41A is formed in the connection portion 41, and the removal operation string 12 is pulled out from the removal hole 41A. In the work at this stage, the upstream piping member 10 in the live pipe state is gas-blocked by the airtight film 11, so that the connection work can proceed safely.

  When the connection by the connecting portion 41 is made, the removal operation string 12 is pulled to break the hermetic membrane 11 into a linear shape as described above, and this is sequentially removed from the removal hole 41A to the outside. As a result, the upstream pipe member 10 and the downstream pipe end 40 are opened. After the airtight film 11 is completely removed, as shown in FIG. The removal work 41A is closed by 41B to complete the connection work.

  According to such a connection method, in the succession construction for connecting the new pipe end 40 to the end of the existing pipe member 10 on the upstream side, it is troublesome to insert the shut-off bag into the upstream pipe and remove it after the connection. The process can be eliminated, and the work process in the field can be simplified. Moreover, since it is not necessary to provide a blocking bag, it is not necessary to secure a working space for that purpose, and the entry of the piping member 10 into the private area can be eliminated.

  9 and 10 show application examples in which the present invention is applied to piping of steel pipes or cast iron pipes. According to this embodiment, when shutting off the pipe end on the upstream side, by installing an end cut-off unit 50 as shown in FIG. Can be simplified.

  The end blocking unit 50 will be described. An airtight film 52 is provided in the end of a piping member 51 made of a steel pipe or a cast iron pipe as in the above-described embodiment. Here, the airtight film 52 itself is resin-molded, and its peripheral portion 52C is fitted into a recess 51A formed on the inner surface of the piping member 51 via a seal member 52D (see the enlarged view of the portion A). The basic structure of the airtight film 52 is the same as that of the above-described embodiment. The non-breaking portion 52A is formed in a spiral shape, and a thin breakage portion 52B is formed between them. The distal end of the removal operation string 53 is fixed to the fixing portion 53A formed on 52A.

  In the end blocking unit 50 in this embodiment, a blocking cover 60 is attached so as to cover the end of the piping member 51, and the sealing members 61 </ b> A, 62 </ b> B, 62 </ b> C are provided between the blocking cover 60 and the outer periphery of the piping member 51. The flange portion 60 </ b> A of the blocking cover 60 and the press ring 61 are fastened with a bolt nut 63 so that the airtightness is ensured by pushing it with the press ring 61.

  When a new pipe is succeeded to the end blocking unit 50 attached to the end of the upstream pipe, a new pipe end is connected via a known mechanical joint 80 as shown in FIG. 70 is connected to the piping member 51.

  The mechanical joint 80 has an end of the pipe member 51 inserted into one end side of the joint pipe 81 and a pipe end 70 inserted into the other end side, and the joint pipe 81, the pipe member 51, and the outer periphery of the pipe end 70 Seal members 84A, 84B, and 84C are inserted between them, and the flange portion 81A of the joint pipe 81 and the press ring 82 are fastened by a bolt and nut 83 so that the seal member 84A, 84B, and 84C are pushed in by the press ring 82 to ensure airtightness. In this embodiment, the removal hole 81B is provided in the joint pipe 81, and the removal operation string 53 is pulled out of the pipe through the removal hole 81B.

  When the attachment of the mechanical joint 80 is completed, the removal operation string 53 is pulled to break the airtight film 52 into a linear shape as described above, and these are sequentially removed from the removal hole 81A to the outside. As a result, the upstream pipe member 51 and the downstream pipe end 70 are opened, but after the airtight film 52 is completely removed, it is removed by the plug member as in the above-described embodiment. The hole 81A is closed to complete the connection work.

  Even in such an embodiment, in the pre-success construction for connecting the new pipe end 70 to the end of the upstream existing pipe member 51 made of a steel pipe or cast iron pipe, a shut-off bag is inserted into the upstream pipe. The troublesome process of removing after connection can be eliminated, and the work process can be simplified.

It is explanatory drawing of a prior art. It is explanatory drawing explaining the edge part structure of the piping member which concerns on embodiment of this invention. It is a front view of the piping member in the embodiment of the present invention. It is sectional drawing of the piping member in embodiment of this invention. It is sectional drawing of the piping member in embodiment of this invention. It is sectional drawing of the piping member in other embodiment of this invention. It is explanatory drawing explaining the piping member in other embodiment of this invention. It is explanatory drawing which shows the piping end part connection method which concerns on embodiment of this invention. It is explanatory drawing which shows the application example of this invention. It is explanatory drawing which shows the application example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,51 Piping member 11,52 Airtight film | membrane 11A, 51A Non-breaking part 11B, 51B Breaking part 11C Non-breaking wire 12,53 Removal operation string 12A Adhering part 20 Protection cap 30 Branch joint 30A Connection part 40 Piping end part 41 Connection part 41A, 81B Removal hole 41B Plug member 50 End block unit 60 Block cover 60A, 81A Flange 61, 82 Push ring 62A-62C, 84A-84C Seal member 63, 83 Bolt nut 81 Joint pipe

Claims (11)

In the end structure of the piping member for connecting a new piping end to the end of the existing piping member on the upstream side,
An airtight membrane for blocking the end portion is provided in the end portion of the piping member, and the airtight membrane can be removed by being broken linearly through a removal hole formed in the connection portion after the connection. The end part structure of the piping member characterized by this.   The airtight film is composed of a spiral non-breaking portion and a thin breakage portion formed between the non-breaking portions, and the outside of the pipe is connected to the non-breaking portion at the center of the airtight film through the removal hole. The end structure of the piping member according to claim 1, wherein a leading end of the removing operation string to be pulled out is fixed.   3. The end structure of a pipe member according to claim 2, wherein a thickness of the fracture portion is thinner as it is closer to the center portion and is thicker as it is closer to the inner surface of the pipe member.   The airtight membrane is provided with a spiral non-breaking wire, and the tip of the non-breaking wire at the center of the airtight membrane has a tip of a removal operation string drawn out of the pipe through the removal hole. The end structure of a piping member according to claim 1, wherein the end structure is fixed.   The pipe member end structure according to any one of claims 1 to 4, wherein the pipe member is a resin material, and the airtight film is integrally formed with the pipe member.   The pipe member end structure according to any one of claims 1 to 5, wherein the pipe member is a short pipe connected to an upstream pipe or a branch joint.   The end structure of a piping member according to claim 1, wherein the piping member is a branch joint.   The end structure of a pipe member according to any one of claims 1 to 7, wherein the airtight film has a pressure resistance against an airtight test after the pipe member is laid.   The piping member according to any one of claims 1 to 8, wherein a conical protective cap is provided at a front end of the piping member in order to drive the end portion into a wall surface of a construction section when buried. End structure. In the pipe member end connection method of connecting a new pipe end to the end of the existing pipe member on the upstream side,
A pipe end on the downstream side is connected to the end of the pipe member whose end is sealed by an airtight film that can be broken and removed in a linear manner via a connecting part having a removal hole, and the airtight film A step of pulling out the removal operation string having the tip fixed thereto from the removal hole;
Pulling the removal operating string to remove the airtight film that has been broken linearly from the removal hole, thereby opening the upstream pipe member and the downstream pipe end. The end part connection method of the piping member characterized by these.   11. The pipe member is embedded prior to the respective steps, and a conical protective cap is attached to the tip of the embedded member, and the tip is driven into the wall surface of the construction section. End connection method for pipe members.

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