JP2019011775A - Connection pipe, and method for laying the same - Google Patents

Abstract

To provide a connection pipe capable of being smoothly inserted into a pipe inside by small drawing force, and a method for laying connection pipe.SOLUTION: A connection pipe is composed of a bendable flexible pipe, is connected by fastening end pipe parts of pipe materials, and has an expanded body 17 provided in the outer periphery of the connection place. The outer periphery of the expanded body 17 is positioned on the outside than a pipe material peripheral surface so as to be abutted on an inner wall of a central pipe line during insertion work into an existing pipe line in laying work of a new pipe. When inserting the connection pipe into the existing pipe and moving while drawing, the expanded body 17 is abutted without exposing the outer peripheral surface to damages due to contact with an existing pipe inner wall, and a place on which the whole connection pipe is abutted becomes intermittent so as to be smoothly inserted into the pipe inside with small drawing force without receiving damages in the pipe material outer peripheral part, and with this, laying piping excellent in durability can be performed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a connecting pipe connecting pipe materials and a method for laying the connecting pipe.

  As a method for laying a buried pipe, a shield method or a pipe-in-pipe method is often used. For example, as disclosed in Patent Document 1, the shield construction method is a laying construction method in which a pipe is carried into a shield provided in the ground and the pipes are sequentially connected, and the pipe-in-pipe construction method is new to the existing pipe. This is a laying method in which a pipe is inserted from a starting vertical shaft provided on one end side of an existing pipe toward a reaching vertical shaft provided on the other end side. The new tube is inserted while the wire attached to the tip of the new tube is wound by the winding device. These construction methods have the advantage that the pipes are laid in the ground without excavating the ground surface, so that noise and the like hardly affect the living environment without obstructing general traffic.

  Comparing the two methods, in the shield method, rails must be laid in the shield, new pipes must be sequentially carried by the transport carriage, and pipe connection work must be performed in the shield. Therefore, there is a problem that the diameter of the laying pipe becomes small.

  On the other hand, in the case of the pipe-in-pipe method, new pipes are inserted sequentially from the starting shaft, so there is no need to provide a space for pipe connection in the existing pipe, and efficient and economical piping work should be performed. Can do.

JP 2003-83470 A

  However, when introducing a new pipe with a large outer diameter into the existing pipe in the laying work by the pipe-in-pipe method, when the new pipe is drawn from the starting shaft to the destination shaft and moved, the outer circumference of the new pipe is almost entirely within the existing pipe. There was a problem that the outer peripheral part was damaged by contacting the wall. Moreover, since the frictional resistance at the time of pulling out increases due to the increased amount of contact with the inner wall, a large load is applied to the pulling wire, and the power consumption of the drive power supply in the wire winding device increases and the cost increases. Inviting problems also occurred.

  In view of the above problems, an object of the present invention is to provide a connecting pipe that can be smoothly inserted into a pipe with a small pulling force and a method for laying the connecting pipe.

The first form according to the present invention is:
A connecting pipe that connects a plurality of pipes, can be arranged in an inserted state through the inside of the pipe line by inserting one end from the pipe line inlet of the pipe line and pulling it out from the pipe line outlet,
The tube material is composed of a flexible tube that can be bent,
A connecting means for directly or indirectly fixing the end pipe portions of each pipe material to connect the pipe materials;
1 or 2 or more diameter-expanded bodies provided on the outer periphery of the connection location and / or its periphery by the connection means,
The connecting pipe is characterized in that an outer periphery of the diameter-expanded body is positioned outside a peripheral surface of the pipe material so as to come into contact with an inner wall of the pipe line in the inserted state.

  According to a second aspect of the present invention, the diameter-enlarged body is a connecting pipe having a length shape extending over a part or the entire outer periphery of the connecting portion and having a circular cross-sectional shape.

  According to a third aspect of the present invention, the diameter-enlarged body is a connecting pipe having a length extending around the outer periphery of the connecting portion and having a torus-like shape.

  The 4th form which concerns on this invention has a relay member fitted to the end pipe part of each pipe material to connect, The said connection means connects between pipe materials via the said relay member, The said enlarged diameter body Is a connecting pipe formed by a deformed portion obtained by deforming a part of the relay member into an enlarged diameter.

  According to a fifth aspect of the present invention, the diameter-enlarged body is composed of a plurality of sets of shaft members having an arcuate outer periphery, and each of the plurality of sets of shaft members has a ridge line of the shaft member outside the outer periphery of the tube material. It is a connecting pipe which is fixedly arranged in parallel in the axial direction of the pipe material so as to cross the connecting portion.

  According to a sixth aspect of the present invention, the flexible tube is constituted by a bellows tube, and the bellows tube for preventing expansion and deformation of the bellows that covers the outer periphery of each of the connected bellows tubes and the expanded body. A connecting pipe having a material.

  The 7th form which concerns on this invention is a connection pipe | tube which provided the anticorrosion layer of the thickness which does not exceed a pipe material outer periphery in the clearance gap formed between the said end pipe part and the said enlarged diameter body.

  According to an eighth aspect of the present invention, there is provided a laying method for laying a connecting pipe according to the first aspect, wherein an end portion of an existing pipe exposed by excavation is excavated at a location where an existing pipe line is buried. An existing pipe line by cutting and attaching a drawer member to one end of the connecting pipe, inserting one end of the connecting pipe from one cutting port of the existing pipe, and pulling out from the other cutting port via the drawer member A connecting pipe laying method characterized in that the connecting pipe is disposed in an inserted state through the inside.

  According to the first embodiment of the present invention, a plurality of pipes can be connected, and one end can be inserted from the pipe inlet of the pipe and pulled out from the pipe outlet so that the pipe can be arranged in an inserted state. A connecting member for connecting the pipe members by directly or indirectly fixing the end pipe portions of each tube member, and a connection by the connecting member. One or two or more diameter-expanded bodies provided on the outer periphery of the location and / or the periphery thereof, and the pipe in the inserted state with the outer peripheral portion of the diameter-expanded body positioned outside the peripheral surface of the pipe material Since the pipe can be brought into contact with the inner wall of the road, for example, when performing pipe construction in which the connection pipe according to this embodiment is arranged as a new pipe having a large outer diameter in the existing pipe by the pipe-in-pipe method, the connection pipe is installed. When moving while inserting into the tube and pulling it out, Without the surface being exposed to damage due to contact with the existing inner wall of the pipe, the expanded body comes into contact, and the place where the entire connecting pipe comes into contact is intermittent and can be smoothly inserted into the pipe. It is possible to carry out laying piping excellent in durability without being damaged. Moreover, the amount of contact with the inner wall is reduced, the frictional resistance at the time of drawing is greatly reduced, and the drawing work can be performed with a small drawing force, so the load on the drawing wire is reduced, and the wire winding device The work cost can be reduced by reducing the power consumption of the drive power supply.

According to the 2nd form which concerns on this invention, since a diameter-expansion body has a length shape over a part of outer periphery of a connection location, or the perimeter, and the shape of a longitudinal cross-section has circular arc shape, for example, said piping In the construction, the contact form between the existing pipe inner wall and the expanded body is not planar, but it is linear or nearly linear, which facilitates smooth insertion and avoids damage to the pipe outer periphery. In addition, it is possible to realize a connecting pipe that can perform laying piping having excellent durability.

  According to the third embodiment of the present invention, the diameter-enlarged body has a length extending over the outer periphery of the connecting portion and has a ring-like shape. Laying pipes with excellent durability that do not have a planar contact form with the diameter body, become linear or nearly linear, promote smooth insertion movement and prevent damage to the outer periphery of the pipe material Can be realized. The torus shape by a hollow tube material or a solid shaft material can be used for the torus-like form which concerns on this form.

  According to the 4th form which concerns on this invention, it has a relay member fitted to the end pipe part of each pipe material to connect, a connection means connects between pipe materials via a relay member, and a diameter-expansion body is Since a part of the relay member is formed by the deformed part deformed to expand in diameter, the deformed part deformed to expand in diameter by using the relay member without using a separate diameter expanded body, For example, in the above piping work, the deformed portion is brought into contact with the existing pipe inner wall, so that the place where the entire connecting pipe comes into contact is intermittent and can be smoothly inserted into the pipe, and the outer peripheral portion of the pipe material is damaged. It is possible to realize a connecting pipe that can be installed and can be installed with excellent durability.

  According to the fifth embodiment of the present invention, the diameter-enlarged body is composed of a plurality of sets of shaft members having an arcuate outer periphery, and each of the plurality of sets of shaft members has a ridge line of the shaft member outside the tube member outer periphery. As shown in FIG. 2, the contact state between the inner wall of the existing pipe and the expanded body is not planar, for example, in the above-described piping work because the pipes are arranged side by side in the axial direction and fixed. Laying piping that has a linear form, facilitates smooth insertion movement and does not damage the outer peripheral portion of the pipe material, and improves the connection strength of the pipe material by fixing the shafts in parallel, and has excellent durability Can be realized.

  According to the sixth aspect of the present invention, the flexible tube is constituted by a bellows tube, and the bellows tube for preventing expansion and deformation of the bellows that covers the outer periphery of each bellows tube and the expanded body of a plurality of connected pipe members. For example, when the connecting pipe according to this embodiment is arranged as a new pipe in an existing water pipe in the above-described piping work, for example, the bellows pipe itself has a bellows structure when water is passed through the bellows pipe. The impact applied to the tube can be mitigated, and the blade material covering the bellows tube absorbs and relaxes the water pressure (external pressure) applied to the bellows tube, preventing the bellows tube from being stretched (bellows stretched) and deformed by an external pressure load. It is possible to realize a connecting pipe capable of laying piping having durability with excellent impact resistance.

  According to the 7th form which concerns on this invention, by providing the anticorrosion layer of the thickness which does not exceed a pipe material outer periphery in the clearance gap formed between an end pipe part and a diameter expansion body, the connection pipe which concerns on this form Is installed in the existing pipeline, unnecessary pipes (such as oxides and other corrosive substances and hydrated substances) are not deposited in the gaps, and the laying pipes with excellent corrosion resistance and superior durability are installed. It is possible to realize a connecting pipe that can be used.

  According to the eighth aspect of the present invention, there is provided a laying method for laying the connecting pipe according to the first aspect on an existing pipe line, where a portion where the existing pipe line is buried is excavated and exposed by excavation. Cut the end of the existing pipe, attach a drawer member to one end of the connecting pipe, insert one end of the connecting pipe from one cutting port of the existing pipe, and pull it out from the other cutting port via the pulling member Since the connecting pipe is disposed in a state of being inserted through the pipe, the advantage of the first embodiment, that is, the portion where the expanded body abuts and the abutting as a whole of the connecting pipe is intermittent and the inside of the pipe is smooth. It is possible to perform laying piping excellent in durability by using a connecting pipe having such a characteristic that it can be inserted into the pipe and the outer periphery of the pipe material is not damaged.

FIG. 1 is a side view showing a connecting pipe 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing an example of the connection structure of the enlarged diameter bodies 2a to 2e and the connection location S in the connection pipe 1 and the enlarged diameter bodies 23 and 24 of another embodiment. FIG. 3 is a longitudinal sectional view showing a welded structure on the pipe 1a side of the connecting pipe 1. FIG. 4 is a sectional view showing a diameter-expanded body 34 of still another embodiment. FIG. 5 is a cross-sectional view showing a connecting pipe provided with an enlarged body integrally formed with the relay member. FIG. 6 is a perspective view showing a welding configuration between the relay members 3. FIG. 7 is a schematic underground sectional view showing a part of the construction procedure by the pipe-in-pipe method using the connecting pipe 1. FIG. 8 is a schematic underground sectional view showing a part of the construction procedure by the pipe-in-pipe method using the connecting pipe 1. FIG. 9 is a schematic underground sectional view showing a part of the construction procedure by the pipe-in-pipe method using the connecting pipe 1. FIG. 10 is a diagram showing the expanded diameter bodies K1 and K2 that can be implemented in a connection structure different from that in FIGS. 1 to 5 and a connection pipe when the expanded diameter body is not provided. FIG. 11 is a side view of the enlarged diameter body 14 which is still another embodiment.

  Hereinafter, embodiments of a connecting pipe according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a connecting pipe 1 according to an embodiment of the present invention.

  The connecting pipe 1 is a connecting body of a plurality of pipe materials suitable for piping work by a pipe-in-pipe method. In the case of FIG. 1, six pipe materials 1a to 1f are connected in a row. Each tube is composed of a flexible tube that can be bent. As each pipe, one having a length of 1 m to several m can be used. The end pipe portions of the flexible pipe are welded together by welding as a connecting means, and the pipe materials are fixed and connected. Diameter expansion bodies 2a to 2e having an outer diameter larger than the outer diameter of the pipe material are attached to the connection portion S by the connecting means for welding the pipe materials. At the open ends of the pipe materials 1a and 1f at both ends, there are provided joint portions 1h and 1g to which joint members for connecting to other pipe materials can be attached. One joint 1g can be coupled to a clamp member 4 used in the pipe-in-pipe method. The clamp member 4 is a metal fitting having a substantially U-shape, and one end of a wire 5 for applying a tensile stress during pipe construction work by the pipe-in-pipe method is fixed to the base portion. A protective material 12 that covers the outer circumferences of the pipe materials 1a to 1f and the expanded diameter bodies 2a to 2e is attached over the entire length of the connecting pipe 1. In addition, in FIG. 1, since the detailed structure of the diameter expansion bodies 2a-2e and the connection location S is mentioned later, it has shown typically and only each positional relationship is shown. A blade member 9 shown in FIG. 3 described later is attached to the outer periphery of each flexible tube, but is omitted in FIG.

  The flexible tube is formed of a flexible tube material by a bellows-shaped metal tube (bellows tube). As the flexible tube, for example, a flexible tube processed into a substantially U-shaped bellows shape while compressing a stainless steel (SUS) raw material tube in the tube axis direction can be used. The bellows shape is not limited to a substantially U shape, and for example, a substantially U shape, a substantially triangular shape, etc., and a continuous wave shape or a discontinuous wave shape can be used.

The blade member 9 is a bellows extension / deformation prevention cover made of a metal wire such as SUS into a net tube shape. As the blade material, for example, a ribbon blade obtained by weaving a strip-shaped metal thin plate in a mesh shape or a wire blade obtained by weaving a metal wire in a mesh shape can be used. When fluid (for example, water for water and sewage) flows in the flexible tube, the impact applied to the flexible tube can be reduced by the bellows structure of the flexible tube itself, and further, by the blade material 9 covering the flexible tube, The water pressure (external pressure) applied to the flexible tube can be absorbed and relaxed to ensure impact resistance that can prevent the flexible tube from being stretched or deformed by an external pressure load. Although omitted in FIG. 1, a protective material 12 for anticorrosion is wound around the outer periphery of the blade material 9. For the protective material 12, for example, an insulating resin or cloth tape material can be used.

  FIG. 2 shows an example of a connection structure of the enlarged diameter bodies 2a to 2e and the connection portion S. The figure (2A) shows the longitudinal cross section of the connection location S periphery, and the figure (2B) shows the AA arrow cross section of (2A). FIG. 2 shows a connection structure between the pipe materials 1a and 1b, and the other pipe materials have the same connection structure.

  FIG. 3 shows a welded structure on the tube 1a side. A similar welding structure is provided on the tube 1b side.

  A terminal portion 8 which is an end tube portion of the bellows portion 6 of the pipe materials 1 a and 1 b is reduced in diameter from the bellows portion 7. A relay member 3 made of a short SUS pipe material is welded to each end portion 8 by welding. The relay member 3 has an inner diameter that can be fitted and fitted to the outer periphery of each bellows portion 6 in close contact. The pipe members 1a and 1b are fixed and connected by abutting the relay members 3 and welding the butted portions by welding. The welding line ML at the welding position between the relay members 3 is located between the pipe ends EP of the bellows portions 6.

  A ring-shaped metal disc 10 such as SUS is inserted on the end portion of the relay member 3 fitted to the end portion 8 of the bellows portion 6. The penetrating portion of the disc 10 has an inner diameter that can be inserted through the terminal portion 8 and the overlapping portion at the end of the relay member 3. The disc 10 is welded on the end of the relay member 3. 3 indicates a welded portion between the relay member 3 and the terminal portion 8, and 15 in FIG. 3 indicates a welded portion between the relay member 3 and the disk 10.

  An end portion of the blade member 9 extends on the disc 10, and a ring body 11 of a pipe member is fitted on the end portion. The end of the blade material 9 and the ring body 11 are welded to the disc 10. Reference numeral 16 in FIG. 3 denotes a welded portion between the end of the blade material 9 and the ring body 11 and the disk 10.

  A diameter-enlarged body 17 is inserted into a welding location between the relay members 3 and is welded to the welding location by welding. The enlarged diameter body 17 has a length shape that extends over the outer periphery of the connecting portion, and has an overall shape like a torus. The outer peripheral position of the enlarged diameter body 17 is set to a position that is larger than the pipe materials 1a and 1b and exceeds the thickness of the ring body 11, and the outer circumference of the enlarged diameter body is located outside the peripheral surface of the tubular material. The protective material 12 is attached so as to cover the pipe materials 1 a and 1 b, the ring body 11, and the diameter-enlarged body 17. As shown in (2A), it slightly bulges in the vicinity of the enlarged diameter member 17 in a protruding shape.

  FIG. 6 shows a welding configuration between the relay members 3. FIG. 6A shows a welded portion between the relay members 3, and FIG. 6B shows a diameter-expanded body 17 that is welded onto the welded portion.

  After forming the welding part 21 in the butt | inclination inclination part 20 of the relay member 3, it welds in the state which mounted the diameter expansion body 17 on the welding part 21, and the diameter expansion body 17 adheres along the welding line ML. Has been. Reference numeral 22 in (6B) indicates a welded portion in which the expanded body 17 is welded onto the welded portion 21.

In the gap formed on the relay member 3 between the bellows portion 6 and the diameter-enlarged body 17, an anticorrosion layer 19 having a thickness not exceeding the outer periphery of the pipe material is provided in a filling state. For the anticorrosion layer 19, for example, an anticorrosion member such as a petrolatum tape can be used. The protective material 12 is provided so as to cover the anticorrosion layer 19. When the connecting pipe 1 is laid in the existing pipe line, unnecessary material (for example, corrosive substances such as oxides or water-containing substances) is formed in the gap formed on the relay member 3 between the bellows portion 6 and the enlarged diameter body 17. Etc.) does not accumulate, the anticorrosion property is high, and the laying piping having higher durability can be performed.

  The laying method of the connecting pipe 1 will be described below based on a construction example.

  7, 8, and 9 show a construction procedure by a pipe-in-pipe method using the connecting pipe 1.

  As shown in FIG. 7, an existing pipe for a water supply pipe is buried in the ground a on which a paved road b and a sidewalk c are formed. The existing pipelines are a central pipeline e buried below the paved road b, a pipeline f buried on the side of the sidewalk c and piped above the central pipeline e, and a connecting pipeline i between the pipelines e and f. The total length of these pipe lines exceeds 10 m. For example, a ductile cast pipe is generally used for the existing pipe line. In addition, this invention is applicable also when a pipe line full length is less than 10 m.

  Two side shafts d are provided by excavating the side of the sidewalk c across the paved road b with the existing pipe line buried. The connecting pipe line i is removed by cutting both ends of the existing pipe exposed by the vertical shaft d. At this time, the joining member h provided in the central pipeline e is also removed and removed. The joint member g provided in the pipe line f is reused for joint connection with the connection pipe 1. The joining member g can be replaced with a new joining member.

  FIG. 8 shows the laying operation of the connecting pipe 1 by the pipe-in-pipe method. The connecting pipe 1 is carried into the work site in a state in which the connecting pipe 1 is wound in advance by the winding device W1. The wire 5 of the drawing member attached to the clamp member 4 attached to one end side of the connecting pipe 1 is inserted from one cutting port e1 of the central pipe line e, and is pulled out from the other cutting port e2 and taken up by the winding device W2. Combined with In FIG. 8, the winding devices W1 and W2 are schematically enlarged.

  When the winding device W2 is driven to rotate, the wire 5 is wound up, and the connecting tube 1 enters the central conduit e and is pulled out from the cutting port e2. When the front end side of the connecting pipe 1 reaches a position where it can be connected to the pipe f on the winding device W2 side, the arrangement of the new pipe by the connecting pipe 1 is completed in the inserted state where the existing pipe is inserted. .

  FIG. 9 shows a state where a new pipe is laid by the connecting pipe 1.

  The joining member 1i of the joining flange for joining with the joining member g of the pipe line f is attached to the front end side of the connecting pipe 1 drawn out from the cutting port e2. By fastening the joining member 1i and the joining member g with bolts and nuts, the front end of the connecting pipe 1 is fixedly connected to the pipe line f. The connecting pipe 1 is dimensioned to the total length that can be connected to the opposite pipe f by connecting the front end and the pipe f, and the connecting flange 1 is also attached to the end of the connecting pipe 1 on the opposite side. By fastening the joint member g of the pipe f on the side with bolts and nuts, the end is fixed and connected to the pipe f. Installation of the connecting pipe 1 is completed so that water can be passed by connecting the joining members at both ends. The connection means with the pipe line is not limited to the one by flange joining with bolts and nuts, and a welding means or the like that butt welds the pipe ends can be used. The laying operation is completed by refilling the vertical shaft d upon completion of the laying of the connecting pipe 1. Since a slight gap is formed between the central pipe line e and the connecting pipe 1 so that it can be inserted, it is preferable to seal the vicinity e3 of the cutting openings e1 and e2 with a mortar material M. By sealing only the vicinity of the cutting opening e3, there is an advantage that the opening operation when the new pipe is replaced again becomes simple.

The connecting pipe 1 is composed of a flexible tube that can be bent, and has end diameter parts 17 fixed to each other and connected to each other, and has an enlarged body 17 provided on the outer periphery of the connected portion. The outer periphery is made larger than the outer periphery of the pipe material so that it can come into contact with the inner wall of the central pipe line e during the insertion operation described in FIG. (10C) of FIG. 10 shows a state in which the expanded body 17 is not provided. When the expanded body 17 is not provided, the outer periphery of each pipe member is exposed to damage due to contact with the inner wall of the existing pipe when it is moved while being inserted into and pulled out from the existing pipe by the pipe-in-pipe method. End up.

  In the present embodiment, when pipe work for arranging the connecting pipe 1 as a new pipe having a large outer diameter in the existing pipe is performed by a pipe-in-pipe method, when the connecting pipe 1 is moved while being inserted and pulled out, Since the diameter-enlarged body 17 abuts on the outer peripheral surface without being damaged by contact with the inner wall of the existing pipe, the amount of contact with the inner wall of the central pipe line e is smaller than that in the state where the diameter-enlarged body 17 is not provided. Less. Therefore, when the connecting pipe 1 is laid, the frictional resistance when it is inserted into and pulled out from the existing pipe is greatly reduced, so that the drawing work can be performed with a small pulling force, and the place where the entire connecting pipe comes into contact is intermittent. Therefore, the pipe can be smoothly inserted into the inside of the pipe, and the outer peripheral portion of the pipe can be prevented from being damaged. According to the connecting pipe 1, the drawing work can be performed with a small pulling force, so the load applied to the drawing wire is reduced, and the work cost is reduced by reducing the power consumption of the drive power supply in the winding device W <b> 2 of the wire 5. be able to. Furthermore, the connecting pipe according to the present invention can be adjusted by the number of pipes connected even if the length of the existing pipe is long, and the outer peripheral part is not damaged even if the number of multiple pipes increases. Laying piping excellent in durability can be implemented.

  In the laying method of laying the connecting pipe 1 in the existing pipe line, as shown in FIGS. 7 to 9, the buried pipes in the existing pipe line are excavated, and both ends of the existing pipe exposed by the excavation are cut. An existing pipe line is obtained by attaching a wire 5 as a drawer member to one end of the connecting pipe 1 and inserting one end of the connecting pipe 1 from one cutting port e1 of the existing pipe and pulling it out from the other cutting port e2 through the wire 5. The connecting pipe 1 can be arranged in an inserted state inserted through the inside. Therefore, according to the laying method according to the present embodiment, when the wire 5 is pulled out, the diameter-enlarged body 17 abuts and the place where the entire connecting pipe abuts is intermittently inserted smoothly into the pipe with a small pulling force. It is possible to carry out laying pipes having excellent durability by using the connecting pipe 1 having such a characteristic that the outer peripheral portion of the pipe material is not damaged. The connecting pipe 1 is a case where six pipe materials 1a to 1f are connected, but in the present invention, the number of connecting pipe materials can be set in accordance with the length of a pipeline to be replaced as a new pipe. The connecting pipe 1 can be used not only as an existing pipe line but also as a new pipe line. When laying a new pipeline, for example, the connecting pipe 1 can be inserted through a tunnel formed in the ground to be laid.

  The diameter-expanded body according to the present invention is not limited to one and can be used two or more. (2C) and (2D) of FIG. 2 show another embodiment in which two diameter-expanding bodies 23 and 24 are arranged at each pipe end. In (2C) and (2D) of FIG. 2, the same members as those in the embodiments of (2A) and (2B) are denoted by the same reference numerals.

  The enlarged-diameter bodies 23 and 24 have an annular shape like the enlarged-diameter body 17 and are welded to the base portion of the bellows part 6 around the connection place with the welded place between the relay members 3 interposed therebetween. It is fixed. An anticorrosion layer 19 similar to (2A) is provided in the gap between the enlarged diameter bodies 23 and 24 on the relay member 3 so as to take anticorrosion measures. As in the embodiments of (2A) and (2B), the arrangement of the enlarged diameter bodies 23 and 24 allows the outer circumference of each enlarged diameter body to be positioned outside the peripheral surface of the pipe material, and is inserted in the laying operation of the new pipe. At the time of work, it can come into contact with the inner wall of the pipeline. Therefore, according to the connecting pipe provided with the enlarged diameter members 23 and 24, when the connecting pipe is inserted into the existing pipe and moved while being pulled out, the outer peripheral surface is brought into contact with the inner wall of the existing pipe as in the above embodiment. Without being exposed to damage, the expanded diameter members 23 and 24 come into contact with each other, and the contact portion as a whole of the connecting tube is intermittently inserted smoothly into the tube, so that the outer peripheral portion of the tube material is not damaged. It is possible to carry out laying pipes excellent in durability.

  FIG. 4 shows another embodiment of the enlarged diameter body 34.

  In the case of FIG. 4, it is comprised by the multiple sets of the enlarged diameter body 34 by the twelve short shaft members. Each shaft member is made of a tube material having an arcuate outer periphery that is shorter than the length of the pair of relay members 3 welded to each other. The twelve diameter-increased bodies 34 are evenly arranged on the upper surface of the relay member 3 along the central axis direction of the connecting pipe at the connecting portions of the bellows portions 6 and welded by welding. Reference numeral 35 in FIG. 4 indicates a welded portion of the enlarged diameter body 34. Each shaft member of the enlarged diameter body 34 is welded and fixed across the connecting portion so that the ridge line of the shaft member is located outside the outer periphery of the pipe member.

  In the embodiment of FIG. 4, the diameter-expanded body 34 is configured by a plurality of sets of shaft members having an arcuate outer periphery, and each of the plurality of sets of shaft members has a ridge line in the axial direction of the shaft member outside the outer periphery of the tube material In the piping work shown in FIGS. 7 to 9, in the piping work shown in FIGS. 7 to 9, the contact state between the existing pipe inner wall and the expanded body However, it does not become planar, it becomes a linear form, it is possible to promote smooth insertion movement with a small pulling force so that the outer peripheral portion of the pipe is not damaged, and the pipe connection strength is increased by fixing the shafts in parallel. It is possible to improve and improve the durability of the installed piping. Also in the case of FIG. 4, anticorrosion measures can be taken by embedding an anticorrosion material similar to the anticorrosion image 19 of the above-described embodiment in the gap between the enlarged diameter bodies 34.

  The diameter-enlarged body according to the present invention can be configured integrally with the relay member without using a member separate from the relay member 3.

  (5A) and (5C) of FIG. 5 each show two examples of a connecting pipe provided with a diameter-enlarged body integrally formed with a relay member. The figure (5B) shows the CC arrow cross section of (5A). The figure (5D) shows the DD arrow cross section of (5C).

  In the case of (5A) in FIG. 5, the relay member 25 is configured by a tube material that can be fitted to the end pipe portion in the same manner as the relay member 3 in FIG. 2, and between the tube materials 1 a and 1 b via the relay member 25. It is connected. The diameter-enlarged body 26 is formed by a deformed portion obtained by rounding the intermediate portion of the relay member 25 into a bellows-like shape with a rounded shape. The circumferential ridge line of the deformed portion is formed so as to be located outside the outer periphery of the pipe material. The pair of relay members 25 are abutted and welded so that the respective enlarged diameter bodies 26 face each other. As in the case of FIG. 2, the anticorrosion layer 27 having a thickness not exceeding the outer periphery of the pipe material is filled in three gaps formed on the relay member 25 between the bellows portion 6 and the enlarged diameter body 26. Is provided with anti-corrosion measures.

  In the case of the enlarged body 26 of (5A), it is not necessary to use a separate enlarged body, and the relay member 25 is used to form a deformed portion that is deformed into an enlarged diameter. In the above-described piping work shown in FIG. 9, by contacting the deformed portion with the existing pipe inner wall, the place where the entire connecting pipe comes into contact is intermittent and can be smoothly inserted into the pipe with a small pulling force. Thus, it is not necessary to damage the outer peripheral portion of the pipe material, and it is possible to perform laying piping having excellent durability.

  In the case of the connecting pipe of (5C), the relay members 28 and 29 fixed to the end pipe portions are provided with enlarged diameter bodies 30 and 31 in which the welded portions are enlarged in diameter. The relay members 28 and 29 are made of a tube material that can be fitted to the end pipe portion, similarly to the relay member 3 in the case of FIG. 2, and connect the tube materials 1 a and 1 b via the relay member 25. The diameter-expanded bodies 30 and 31 are expanded in diameter so as to be located outside the outer periphery of the pipe material. The pair of relay members 28 and 29 are abutted and welded. As in the case of FIG. 2, the anticorrosion layer 32 having a thickness not exceeding the outer periphery of the pipe material is formed in two gaps formed on the relay members 28 and 29 between the bellows portion 6 and the enlarged diameter body 26. 33 is provided in a filling form and anticorrosion measures are taken.

  In the case of the expanded diameter bodies 30 and 31 of (5C), it is not necessary to use a separate expanded diameter body like the expanded diameter body 26 of (5A), and the diameter is increased by using the relay members 28 and 29. Since the deformed deformed portion is formed, in the above-described piping work shown in FIGS. 7 to 9, the deformed portion is brought into contact with the existing inner wall of the pipe, so that the contact portion as a whole of the connecting pipe is It becomes intermittent and can be smoothly inserted into the pipe with a small pulling force, so that the outer peripheral portion of the pipe material is not damaged, and laying piping excellent in durability can be performed. In addition, said diameter expansion body 17 grade | etc., Is not limited to when comprised with a single shaft material, For example, it can divide | segment into half and can be comprised by integrating with multiple materials.

  1 to 5 has a connection structure in which pipe members are indirectly connected via a relay member, the present invention has a direct connection structure in which pipe materials are directly connected without using a relay member (so-called immo). It can also be applied to a connecting pipe having a joint structure.

  (10A) and (10B) of FIG. 10 respectively show the expanded bodies K1 and K2 used for the connecting pipe having a direct connection structure.

  A bellows pipe having an end portion with a reduced diameter as shown by the terminal end portion 8 is used as a connecting tube having a connecting structure connected via a relay member. On the other hand, the connecting pipe having the direct connection structure has a connecting structure for welding and connecting the bellows pipes B1 and B2 or B5 and B6 that do not have the reduced diameter end portions such as the end portion 8. In the case of (10A), the end portions B3 and B4 of the bellows tubes B1 and B2 are partially removed, and the diameter-enlarged body K1 is inserted in a gap that faces the removed portions. The diameter-enlarged body K1 is composed of an annular body in which a shaft member is formed in a ring shape. It welds by welding in the state which inserted the enlarged body K1 in this clearance gap. Reference numerals m1 and m2 in (10A) indicate welded portions between the enlarged body K1 and the end portions B3 and B4 of the bellows tubes B1 and B2. The ridge line on the outer periphery of the expanded body K1 is expanded from the outer periphery of the bellows tubes B1 and B2. A protective material 6a is attached to the outer circumferences of the expanded body K1 and the bellows tubes B1 and B2.

  In the case of (10B), the end portions of the bellows pipes B1 and B2 are abutted and welded at the bellows bottom portions B7 and B8. Reference numeral m3 in (10B) indicates a welded portion between the end portions of the bellows bottom portions B7 and B8. A ring-shaped expanded body K2 is inserted into a recess formed by welding the end portions of the bellows tubes B1 and B2. The outer diameter of the expanded body K2 is larger than the outer diameter of the bellows tubes B5 and B6. A protective material 6a is attached to the outer periphery of the expanded body K2 bellows pipes B5 and B6.

  In each of the expanded diameter bodies K1 and K2 of (10A) and (10B), the outer diameter of the expanded diameter body is made larger than the outer diameter of the pipe material in the same manner as the expanded diameter body in the connecting pipe of FIGS. In the insertion state described in FIG. 8, since it can come into contact with the inner wall of the piping path, when performing piping work to arrange the connecting pipe as a new pipe having a large outer diameter in the existing pipe by the pipe-in-pipe method, When the connecting pipe is inserted into the existing pipe and moved while being pulled out, the outer peripheral surface of the pipe material is not exposed to damage due to contact with the inner wall of the existing pipe, and the expanded body comes into contact with each other, and the place where the whole connecting pipe comes into contact is intermittent Thus, the pipe can be smoothly inserted into the pipe with a small pulling force, and the outer peripheral portion of the pipe material can be prevented from being damaged, and laying piping having excellent durability can be performed. The expanded diameter bodies K1 and K2 are not limited to solid metal materials, and hollow metal materials can be used.

  In the case of the above-described embodiment, for example, in the enlarged body 17 shown in FIG. 2, the entire outer periphery is located outside the peripheral surface of the pipe material, but may be partially located outside.

  FIG. 11 is a side view of the diameter-enlarged body 14 in which a part of the outer periphery is located outside the pipe peripheral surface.

Like the expanded body 17, the expanded body 14 has a length shape over the outer periphery of the connection portion between the pipe members, an inner diameter portion 14b fitted to the connection portion, and an overall shape like an annular body, Furthermore, the outer peripheral ridge line 14
Eight concave portions 18 are provided in the radial direction along a. The recess 18 can be formed by partially hitting or cutting the outer periphery of the shaft member or the tube member. Similarly to the expanded body 17, when the expanded body 14 is mounted at a connecting portion between the pipe materials, the outer peripheral ridge line 14 a is located outside the outer periphery of the pipe material. According to the enlarged diameter body 14, since the outer peripheral ridge line 14a is divided by the recess 18 and the outer peripheral portion becomes discontinuous, the contactable area with the existing pipe inner wall is reduced compared to the enlarged diameter body 17, so that the insertion work can be performed more smoothly. It can be performed. The means for reducing the contactable area in the expanded body is not limited to the concave portion 18, and for example, a wavy portion formed along the outer peripheral ridge line 14 a, or a large number of holes recessed in the outer peripheral surface can be used. .

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications, design changes and the like within the scope not departing from the technical idea of the present invention are included in the technical scope. Nor.

  The present invention uses a connecting pipe having such characteristics that it can be smoothly inserted into the pipe with a small pulling force when laid in an existing pipe line, and the outer peripheral portion of the pipe material is not damaged. It is possible to provide a laying method capable of laying piping having excellent durability. The present invention can be applied not only to water system pipelines such as water and sewage systems but also to gas pipelines used for various gas circulations, cable buried pipelines for power / communication systems, and the like.

DESCRIPTION OF SYMBOLS 1 Connection pipe 1a Tubing material 1b Tubing material 1c Tubing material 1d Tubing material 1e Tubing material 1f Tubing material 1g Joining part 1h Joining part 1i Joining member 2a Expanding body 2b Expanding body 2c Expanding body 2d Expanding body 2e Expanding body 3 Clamping member 4 DESCRIPTION OF SYMBOLS 5 Wire 6 Bellows part 6a Protective material 7 Bellows part 8 Termination part 9 Blade material 10 Disc 11 Ring body 12 Protective material 13 Welding part 14 Expanded body 14a Outer peripheral edge 15 Welded part 16 Expanded body 18 Recessed part 19 Anticorrosion Layer 20 Inclined portion 21 Welded portion 22 Welded portion 23 Expanded body 24 Expanded body 25 Relay member 26 Expanded body 27 Corrosion-proof layer 28 Relay member 29 Relay member 30 Expanded body 31 Expanded body 32 Corrosion-proof layer 33 Corrosion-proof layer 34 Expand Diameter body a Underground b Paved road c Sidewalk d Vertical shaft e Central pipe line e1 Cut port e2 Cut port f Pipe line g Joint member h Joint member i Connection pipe line S Connection ML Welding line EP Pipe end W1 Winding device W2 Winding device K1 Expanded body K2 Expanded body B1 Bellows tube B2 Bellows tube B3 Bellows tube B4 Bellows tube B5 Bellows tube B6 Bellows tube B7 Bellows tube B8 Bellows tube m1 Welded part m2 welding part m3 welding part

Claims (8)

A connecting pipe that connects a plurality of pipes, can be arranged in an inserted state through the inside of the pipe line by inserting one end from the pipe line inlet of the pipe line and pulling it out from the pipe line outlet,
The tube material is composed of a flexible tube that can be bent,
A connecting means for directly or indirectly fixing the end pipe portions of each pipe material to connect the pipe materials;
1 or 2 or more diameter-expanded bodies provided on the outer periphery of the connection location and / or its periphery by the connection means,
A connecting pipe characterized in that an outer periphery of the diameter-expanded body is positioned outside a peripheral surface of a pipe material so as to come into contact with an inner wall of the pipe line in the inserted state.   The connecting pipe according to claim 1, wherein the diameter-enlarged body has a length shape that extends over a part or the entire periphery of the connecting portion, and a longitudinal section has an arc shape.   3. The connecting pipe according to claim 1, wherein the diameter-enlarged body has a length extending around an outer periphery of the connecting portion and has a ring-like shape. It has a relay member that fits into the end pipe part of each pipe material that connects,
The connecting means connects the pipe members via the relay member,
4. The connecting pipe according to claim 1, wherein the enlarged body is formed by a deformed portion obtained by deforming a part of the relay member into an enlarged diameter. The diameter-enlarged body is composed of a plurality of sets of shaft members having an arcuate outer periphery,
The plurality of sets of shaft members are fixed in parallel in the axial direction of the pipe material across the connecting portion so that the ridge line of the shaft material is located outside the outer periphery of the pipe material. The connecting pipe according to any one of the above. The flexible tube is constituted by a bellows tube,
The connecting pipe according to any one of claims 1 to 5, further comprising a bellows for preventing expansion and deformation of the bellows covering each of the bellows pipes of the plurality of connected pipe materials and the outer periphery of the enlarged diameter body.   The connecting pipe according to any one of claims 1 to 6, wherein an anticorrosive layer having a thickness not exceeding the outer periphery of the pipe material is provided in a gap formed between the end pipe portion and the enlarged diameter body.   A laying method for laying a connecting pipe according to claim 1, wherein a portion where an existing pipe line is buried is excavated, an end portion of an existing pipe exposed by excavation is cut, and drawn to one end of the connecting pipe. Attach a member, insert one end of the connecting pipe from one cut end of the existing pipe, and pull out from the other cut end through the pull-out member, so that the connecting pipe is inserted into the existing pipe line. A method of laying a connecting pipe, characterized in that

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