JP6944181B2 - Connecting pipe and laying method of connecting pipe - Google Patents

Description

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

The shield method or the pipe-in-pipe method is often used as the laying method for buried pipes. For example, as disclosed in Patent Document 1, the shield method is a laying method in which pipes are carried into a shield provided underground and the pipes are sequentially connected, and the pipe-in pipe method is a new method in an existing pipe. This is a laying method in which a pipe is inserted from a starting shaft provided on one end side of an existing pipe toward a reaching shaft provided on the other end side. The work of inserting the new pipe is performed while winding the wire attached to the tip of the new pipe with a winding device. Since these construction methods lay pipes in the ground without excavating the ground surface, they have the advantage that they do not interfere with general traffic and are less likely to affect the living environment due to noise or the like.

Comparing the two methods, in the case of the shield method, it is necessary to lay rails in the shield, carry in new pipes in sequence with a transport trolley, and connect the pipes in the shield, so there is a work space inside the shield. It is necessary to secure it, so 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 space for pipe connection work in the existing pipes, and efficient and economical piping work should be performed. Can be done.

Japanese Unexamined Patent Publication No. 2003-83470

However, in the laying work by the pipe-in-pipe method, when a new pipe with a large outer diameter is introduced into the existing pipe, when the new pipe is pulled out from the starting shaft to the reaching shaft and moved, the outer circumference of the new pipe is almost entirely inside the existing pipe. There was a problem that the outer peripheral part was damaged due to contact with the wall. Moreover, since the frictional resistance at the time of drawing out increases due to the increase in the amount of contact with the inner wall, a large load is applied to the wire for drawing out, and the power consumption of the drive power supply in the wire winding device increases, resulting in an increase in cost. There was also a problem that caused it.

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 of laying the connecting pipe.

The first aspect according to the present invention is
A connecting pipe that can be arranged in an inserted state by connecting a plurality of pipe materials, inserting one end from the pipe entrance of the pipe, and pulling out from the pipe outlet.
The pipe material is composed of a flexible pipe that can be flexed.
A connecting means for directly or indirectly fixing the end pipe portions of each pipe material to connect the pipe materials,
It has one or two or more diameter-expanding bodies provided on the outer periphery of the connecting portion and / or the periphery thereof by the connecting means.
The connecting pipe is characterized in that the outer periphery of the enlarged diameter body is positioned outside the peripheral surface of the pipe material so that it can come into contact with the inner wall of the pipe passage in the inserted state.

A second embodiment according to the present invention is a connecting pipe in which the enlarged diameter body has a length shape covering a part or the entire circumference of the outer periphery of the connecting portion, and the shape of the vertical cross section has an arc shape.

A third aspect according to the present invention is a connecting pipe in which the enlarged diameter body has a length extending over the outer circumference of the connecting portion and has an annulus (torus) -like shape.

A fourth aspect according to the present invention has a relay member that fits into the end pipe portion of each pipe material to be connected, and the connecting means connects the pipe materials via the relay member and the diameter-expanded body. Is a connecting pipe formed by a deformed portion obtained by deforming a part of the relay member in a diameter-expanded shape.

In the fifth aspect of the present invention, the diameter-expanding body is composed of a plurality of sets of shaft members having an arcuate outer circumference, and in each of the plurality of sets of shaft members, the ridgeline of the shaft member is outside the outer circumference of the pipe member. It is a connecting pipe that is vertically arranged and fixed in the axial direction of the pipe material across the connecting portion so as to be located at.

In the sixth aspect according to the present invention, the flexible tube is composed of a bellows tube, and each bellows tube of a plurality of connected pipe materials and a blade for preventing bellows extension / deformation that covers the outer periphery of the enlarged diameter body. It is a connecting pipe having a material.

A seventh aspect according to the present invention is a connecting pipe provided with an anticorrosion layer having a thickness not exceeding the outer circumference of the pipe material in a gap formed between the end pipe portion and the diameter-expanding body.

The eighth aspect according to the present invention is the laying method for laying the connecting pipe according to the first aspect, in which the buried portion of the existing pipeline is excavated and the end portion of the existing pipe exposed by the excavation is excavated. An existing pipeline is cut by cutting, attaching a pull-out 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 through the pull-out member. It is a method of laying a connecting pipe, characterized in that the connecting pipe is arranged in an inserted state through which the inside is inserted.

According to the first aspect of the present invention, a plurality of pipe materials can be connected, and one end thereof can be inserted from the pipe inlet of the pipe and pulled out from the pipe outlet to be arranged in an inserted state through which the pipe is inserted. The pipe material is a flexible pipe that can be flexibly formed, and the end pipe portions of the pipe materials are directly or indirectly fixed to each other to connect the pipe materials, and the connecting means is used to connect the pipe materials. It has one or two or more diameter-expanded bodies provided on the outer periphery of the location and / or its periphery, and the outer peripheral portion of the diameter-expanded body is positioned outside the peripheral surface of the pipe material, and the pipe is piped in the inserted state. Since it is possible to contact the inner wall of the road, for example, when performing piping work to arrange the connecting pipe according to this embodiment as a new pipe having a large outer diameter in the existing pipe by the pipe-in-pipe method, the connecting pipe is already installed. When the pipe material is inserted into the 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 existing pipe inner wall. It becomes possible to smoothly insert the pipe material, the outer peripheral portion of the pipe material is not damaged, and the laying pipe having excellent durability can be performed. Moreover, the amount of contact with the inner wall is reduced, the frictional resistance at the time of pulling out is greatly reduced, and the pulling work can be performed with a small pulling force. The work cost can be reduced by reducing the power consumption of the drive power supply.

According to the second aspect of the present invention, the diameter-expanded body has a length shape over a part or the entire circumference of the outer circumference of the connecting portion, and the shape of the vertical cross section has an arc shape. In the construction, the contact mode between the inner wall of the existing pipe and the enlarged diameter body does not become planar, but linear or close to linear, promoting smooth insertion movement and preventing damage to the outer peripheral part of the pipe material. , It is possible to realize a connecting pipe that can perform laying piping with excellent durability.

According to the third aspect of the present invention, the diameter-expanded body has a length extending over the outer circumference of the connecting portion and has a ring-like shape. The contact mode with the diameter body does not become planar, but linear or close to linear, promotes smooth insertion and movement, does not damage the outer peripheral part of the pipe material, and has excellent durability. It is possible to realize a connecting pipe that can perform the above. For the annulus-like body according to this embodiment, a torus shape made of a hollow tube material or a solid shaft material can be used.

According to the fourth aspect of the present invention, there is a relay member that fits into the end pipe portion of each pipe material to be connected, the connecting means connects the pipe materials via the relay member, and the diameter-expanding body is Since a part of the relay member was formed by the deformed portion deformed in a diameter-expanded shape, the deformed portion deformed in a diameter-expanded shape was formed by using the relay member without using a separate diameter-expanded body. For example, in the above piping work, by bringing the deformed portion into contact with the inner wall of the existing pipe, the contacting portion of the connecting pipe as a whole becomes intermittent and can be smoothly inserted into the inside of the pipe, resulting in damage to the outer peripheral portion of the pipe material. It is possible to realize a connecting pipe that does not need to be received and can perform laying piping with excellent durability.

According to the fifth aspect of the present invention, the diameter-expanding body is composed of a plurality of sets of shaft members having an arcuate outer circumference, and in each of the plurality of sets of shaft members, the ridgeline of the shaft member is outside the outer circumference of the pipe material. Since the pipe material was juxtaposed and fixed in parallel in the axial direction across the connecting portion so as to be located at, for example, in the above piping work, the contact mode between the existing pipe inner wall and the diameter-expanding body does not become planar. , The linear shape promotes smooth insertion and movement so that the outer peripheral part of the pipe material is not damaged, and the pipe material connection strength is improved by the juxtaposed shaft material, and the laying pipe has excellent durability. It is possible to realize a connecting pipe that can perform the above.

According to the sixth aspect of the present invention, the flexible pipe is composed of bellows pipes, and the bellows pipes of a plurality of connected pipe materials and the blades for preventing bellows extension / deformation that cover the outer periphery of the diameter-expanding body are formed. Since it has a material, for example, in the above piping work, when the connecting pipe according to this embodiment is arranged as a new pipe in an existing water pipe, for example, when water is passed through the bellows pipe, the bellows due to the bellows structure of the bellows pipe itself. The impact applied to the pipe can be mitigated, and the blade material covering the bellows pipe absorbs and relaxes the water pressure (external pressure) received by the bellows pipe to prevent the bellows pipe from stretching (bellows stretching) and deformation due to the external pressure load. It is possible to realize a connecting pipe capable of laying pipes having excellent durability with excellent impact resistance.

According to the seventh aspect of the present invention, the connecting pipe according to the present embodiment is provided with an anticorrosive layer having a thickness not exceeding the outer circumference of the pipe material in the gap formed between the end pipe portion and the enlarged diameter body. When laying in an existing pipeline, unnecessary substances (for example, corrosive substances such as oxides, water-containing substances, etc.) do not accumulate in the gaps, and the laying pipe is rich in corrosion resistance and has better durability. It is possible to realize a connecting pipe that can be used.

According to the eighth aspect of the present invention, it is a laying method of laying the connecting pipe according to the first aspect in the existing pipeline, and the buried portion of the existing pipeline is excavated and exposed by excavation. Existing by cutting the end of the existing pipe, attaching a pull-out 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 through the pull-out member. Since the connecting pipe is arranged in the inserted state where it is inserted through the pipeline, the advantage of the first embodiment, that is, the portion where the diameter-expanding body comes into contact and the connecting pipe as a whole comes into contact with each other becomes intermittent and smooth inside the pipe. It is possible to perform laying pipes with excellent durability by using a connecting pipe that can be inserted into the pipe and has the characteristic that the outer peripheral portion 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 a connecting structure of the enlarged diameter bodies 2a to 2e and the connecting portion S in the connecting pipe 1 and the enlarged diameter bodies 23 and 24 of another embodiment. FIG. 3 is a vertical cross-sectional view showing a welded structure of the connecting pipe 1 on the pipe material 1a side. FIG. 4 is a cross-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 a diameter-expanding body integrally formed with a relay member. FIG. 6 is a perspective view showing a welding configuration between the relay members 3. FIG. 7 is a schematic underground cross-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 cross-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 cross-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 diameter-expanding bodies K1 and K2 that can be implemented in a connection structure different from that of FIGS. 1 to 5, and a connecting pipe when the diameter-expanding body is not provided. FIG. 11 is a side view of the diameter-expanding body 14 which is still another embodiment.

Hereinafter, the drawings will be described in detail with reference to the drawings to which the embodiment of the connecting pipe according to the present invention is attached.

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 pipe construction by the pipe-in-pipe method. In the case of FIG. 1, six pipe materials 1a to 1f are connected in a row. Each pipe material is composed of a flexible pipe that can be flexed. As each pipe material, a material 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 to each other. Expanded bodies 2a to 2e having an outer diameter larger than the outer diameter of the pipe material are attached to the connecting 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, joint portions 1h and 1g to which a joint member for connecting with other pipe materials can be attached are provided. The clamp material 4 used in the pipe-in-pipe method can be bonded to one joint portion 1 g. The clamp material 4 is a metal fitting having a substantially U-shape, and one end of a wire 5 for applying tensile stress during piping construction work by the pipe-in-pipe method is fixed to the root portion thereof. A protective material 12 that covers the outer circumferences of the pipe members 1a to 1f and the diameter-expanding bodies 2a to 2e is adhered to the entire length of the connecting pipe 1. In FIG. 1, since the detailed structures of the enlarged diameter bodies 2a to 2e and the connecting portion S will be described later, they are schematically shown and only the positional relationship is shown. The blade material 9 shown in FIG. 3, which will be described later, is adhered to the outer periphery of each flexible tube, but it is omitted in FIG.

The flexible tube is composed of a tube material that is made flexible by a metal tube (bellows tube) formed by bellows. As the flexible pipe, for example, a flexible pipe processed into a substantially U-shaped bellows shape while compressing a raw pipe made of stainless steel (SUS) in the pipe axial 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, or the like, and a continuous wave shape or a discontinuous wave shape can be used.

The blade material 9 is a bellows extension / deformation prevention cover formed into a net cylinder by a metal wire such as SUS. As the blade material, for example, a ribbon blade in which a strip-shaped metal thin plate is woven in a mesh shape or a wire blade in which a metal wire is woven in a mesh shape can be used. When a fluid (for example, water and sewage water) flows through the flexible pipe, the bellows structure of the flexible pipe itself can alleviate the impact applied to the flexible pipe, and the blade material 9 covering the flexible pipe further provides. By absorbing and relaxing the water pressure (external pressure) received by the flexible pipe, it is possible to secure impact resistance that can prevent the flexible pipe from stretching or deforming due to an external pressure load. Although omitted in FIG. 1, a protective material 12 for corrosion protection is wrapped 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 the connecting structure of the enlarged diameter bodies 2a to 2e and the connecting portion S. FIG. (2A) shows a vertical cross section around the connecting portion S, and FIG. (2B) shows a cross section taken along the line AA of (2A). FIG. 2 shows a connecting structure between the pipe materials 1a and 1b, and the other pipe materials have the same connecting structure.

FIG. 3 shows a welded structure on the pipe material 1a side. The same welding structure is formed on the pipe material 1b side.

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

A ring-shaped metal disk 10 such as SUS is inserted onto the end of the relay member 3 fitted to the end 8 of the bellows portion 6. The penetrating portion of the disk 10 has an inner diameter that can be inserted into the overlapping portion of the end portion 8 and the end portion of the relay member 3. The disk 10 is welded on the end of the relay member 3. Reference numeral 13 in FIG. 3 indicates a welded portion between the relay member 3 and the terminal portion 8, and reference numeral 15 in FIG. 3 indicates a welded portion between the relay member 3 and the disk 10.

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

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

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-expanding body 17 welded onto the welded portion.

After the welded portion 21 is formed on the butt inclined portion 20 of the relay member 3, the enlarged diameter body 17 is welded while being placed on the welded portion 21, and the enlarged diameter body 17 is fixed along the welding line ML. Has been done. Reference numeral 22 (6B) indicates a welded portion in which the enlarged diameter body 17 is welded onto the welded portion 21.

An anticorrosion layer 19 having a thickness not exceeding the outer circumference of the pipe material is provided in a filling shape in the gap formed on the relay member 3 between the bellows portion 6 and the diameter-expanding body 17. For the anticorrosion layer 19, for example, an anticorrosion member such as 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 pipeline, unnecessary substances (for example, corrosive substances such as oxides and water-containing substances) are formed in the gap formed on the relay member 3 between the bellows portion 6 and the diameter-expanding body 17. Etc.) do not accumulate, and it is possible to carry out laying piping with excellent corrosion resistance and better durability.

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

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

As shown in FIG. 7, the existing pipeline of the water pipeline is buried in the ground a on the ground where the paved road b and the sidewalk c are formed. The existing pipelines are the central pipeline e buried under the paved road b, the pipeline f buried above the central pipeline e and the connecting pipelines i of the pipelines e and f, which are buried on the side of the sidewalk c. The total length of these pipelines exceeds 10 m. For the existing pipeline, for example, a ductile cast pipe is generally used. The present invention can also be applied when the total length of the pipeline is less than 10 m.

The buried part of the existing pipeline is excavated on the sidewalk c side with the paved road b in between, and two shafts d are provided. The connecting pipeline i is removed by cutting both ends of the existing pipe exposed by the shaft d. At this time, the joining member h provided in the central conduit e is also removed and removed. The joining member g provided in the pipeline f is reused for joining and connecting with the connecting pipe 1. The joining member g can also be replaced with a new joining member.

FIG. 8 shows the laying work of the connecting pipe 1 by the pipe-in-pipe method. The connecting pipe 1 is brought into the work site in a state of being previously wound by the winding device W1. The wire 5 of the pull-out member attached to the clamp material 4 attached to one end side of the connecting pipe 1 is inserted from one cutting port e1 of the central pipeline e and pulled out from the other cutting port e2 to take up the winding device W2. Combined with. In FIG. 8, the take-up devices W1 and W2 are shown schematically enlarged.

By rotationally driving the winding device W2, the wire 5 is wound, and the connecting pipe 1 enters the central pipeline 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 in the inserted state through the existing pipe is completed. ..

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

A joining member 1i of a joining flange for joining with the joining member g of the pipeline f is attached to the front end side of the connecting pipe 1 drawn out from the cutting port e2. The front end of the connecting pipe 1 is fixed and connected to the pipe line f by fastening the joining member 1i and the joining member g with bolts and nuts. The end side of the connecting pipe 1 is measured to the total length that can be connected to the opposite side pipe f by connecting the front end and the pipe line f. The end is fixed and connected to the pipeline f by fastening the joining member g of the side pipeline f with bolts and nuts. The laying of the connecting pipe 1 is completed so that water can flow by connecting the joining members at both ends. The means for connecting to the pipeline is not limited to flange joining with bolts and nuts, and welding means for butt-welding the ends of the pipeline can be used. The laying work is completed by backfilling the shaft d when the laying of the connecting pipe 1 is completed. Since a slight gap is formed between the central conduit e and the connecting pipe 1 so that the connecting pipe 1 can be inserted, it is preferable to seal the vicinity e3 of the cutting ports e1 and e2 with the mortar material M. By sealing only the e3 near the cutting port, there is an advantage that the opening operation when replacing a new pipe again becomes simple.

The connecting pipe 1 is composed of a flexible pipe that can be flexed, and has a diameter-expanding body 17 provided on the outer periphery of the connecting portion by fixing and connecting the end pipe portions of the pipe materials to each other. The outer circumference is made larger than the outer circumference of the pipe material so that it can come into contact with the inner wall of the central conduit e during the insertion work described with reference to FIG. 8 in the new pipe laying work. FIG. 10 (10C) shows a state in which the diameter-expanding body 17 is not provided. In the state where the enlarged diameter body 17 is not provided, the outer circumference of each pipe material is exposed to damage due to contact with the inner wall of the existing pipe and is damaged when it is inserted into the existing pipe by the pipe-in-pipe method and moved while being pulled out. It ends up.

In the present embodiment, when the piping work for arranging the connecting pipe 1 as a new pipe having a large outer diameter in the existing pipe is performed by the pipe-in-pipe method, when the connecting pipe 1 is inserted into the existing pipe and moved while being pulled out, Since the diameter-expanding body 17 comes into contact with the outer peripheral surface without being exposed to damage due to contact with the existing pipe inner wall, the amount of contact with the inner wall of the central pipeline e is smaller than that in the state without the diameter-expanding body 17. Less. Therefore, when the connecting pipe 1 is laid, the frictional resistance when the connecting pipe 1 is inserted into the existing pipe and pulled out is significantly reduced, so that the pulling work can be performed with a small pulling force, and the contact points of the connecting pipe as a whole are intermittent. It becomes possible to insert the pipe smoothly into the pipe, and the outer peripheral portion of the pipe material is not damaged, and the laying pipe having excellent durability can be performed. According to the connecting pipe 1, since the pulling work can be performed with a small pulling force, the load applied to the pulling wire is reduced, and the work cost is reduced by reducing the power consumption of the drive power source in the wire 5 winding device W2. be able to. Further, the connecting pipe according to the present invention can be adjusted by the number of connected pipes even if the length of the existing pipe is long, and even if the number of pipes is large, the outer peripheral portion is not damaged. It is possible to carry out laying piping with excellent durability.

In the laying method of laying the connecting pipe 1 in the existing pipeline, as shown in FIGS. 7 to 9, the buried portion of the existing pipeline is excavated, and both ends of the existing pipe exposed by the excavation are cut. A wire 5 of a pull-out member is attached to one end of the connecting pipe 1, one end of the connecting pipe 1 is inserted from one cutting port e1 of the existing pipe, and the wire 5 is pulled out from the other cutting port e2 via the wire 5. The connecting pipe 1 can be arranged in the inserted state through which the inside is inserted. Therefore, according to the laying method according to the present embodiment, the portion where the diameter-expanding body 17 comes into contact with the wire 5 and comes into contact with the connecting pipe as a whole is intermittent, and the wire 5 is smoothly inserted into the pipe with a small pulling force. It is possible to carry out laying piping having excellent durability by using the connecting pipe 1 having 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 connected pipe materials can be set according to the length of the pipe line to be replaced as a new pipe. The connecting pipe 1 can be used not only for laying an existing pipe but also as a new pipe. When laying a new pipeline, for example, the connecting pipe 1 can be inserted into a tunnel formed in the ground to be laid.

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

The diameter-expanding bodies 23 and 24 have an overall ring-like shape similar to the diameter-expanding body 17, and are welded to the root portion of the bellows portion 6 around the connecting portion with the welding portion between the relay members 3 interposed therebetween. It is stuck. The same anticorrosion layer 19 as in (2A) is provided in a filling shape in the gap between the enlarged diameter bodies 23 and 24 on the relay member 3, and anticorrosion measures are taken. By arranging the diameter-expanding bodies 23 and 24, the outer periphery of each diameter-expanding body is positioned outside the peripheral surface of the pipe material, as in the examples of (2A) and (2B), and the new pipe is inserted in the laying work. During work, it can come into contact with the inner wall of the piping path. Therefore, according to the connecting pipe provided with the enlarged diameter bodies 23 and 24, the outer peripheral surface is in contact with the inner wall of the existing pipe when the connecting pipe is inserted into the existing pipe and moved while being pulled out, as in the above embodiment. The enlarged diameter bodies 23 and 24 come into contact with each other without being exposed to damage, and the points where the connecting pipes as a whole come into contact with each other become intermittent so that they can be smoothly inserted into the inside of the pipe, and the outer peripheral portion of the pipe material is not damaged. , It is possible to carry out laying piping with excellent durability.

FIG. 4 shows an embodiment of yet another diameter-expanding body 34.

In the case of FIG. 4, it is composed of a plurality of sets of diameter-expanding bodies 34 by twelve short shaft members. Each shaft member is made of a pipe material having an arcuate outer circumference shorter than the length of the pair of relay members 3 welded to each other. The twelve diameter-expanding 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 points between the bellows portions 6, and are welded together. 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 circumference of the pipe member.

In the embodiment of FIG. 4, the diameter-expanding body 34 is composed of a plurality of sets of shaft members having an arcuate outer circumference, and in each of the plurality of sets of shaft members, the ridge line in the axial direction of the shaft member is outside the outer circumference of the pipe material. Since they are juxtaposed and fixed in parallel in the axial direction across the connecting portion so as to be located at, in the piping work shown in FIGS. Is not planar, but linear, and a small pulling force promotes smooth insertion and movement so that the outer peripheral portion of the pipe is not damaged. It is possible to improve and perform laying piping with excellent durability. Also in the case of FIG. 4, anticorrosion measures can be taken by embedding the same anticorrosion ingredients as in the anticorrosion image 19 of the embodiment in the gaps between the enlarged diameter bodies 34.

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

5A and 5C of FIG. 5 show two examples of connecting pipes having a diameter-expanding body integrally formed with a relay member, respectively. FIG. (5B) shows a cross section taken along the line CC of (5A). FIG. (5D) shows a cross section taken along the line DD of (5C).

In the case of (5A) of FIG. 5, the relay member 25 is composed of a pipe material that can be fitted to the end pipe portion in the same manner as the relay member 3 in the case of FIG. It is connected. The diameter-expanding body 26 is formed by a deformed portion in which the intermediate portion of the relay member 25 is rounded and deformed in a bellows shape. The circumferential ridge of the deformed portion is formed so as to be located outside the outer circumference of the pipe material. The pair of relay members 25 are butted and welded so that the enlarged diameter bodies 26 face each other. Similar to the case of FIG. 2, the three gaps formed on the relay member 25 between the bellows portion 6 and the diameter-expanding body 26 are filled with the anticorrosion layer 27 having a thickness not exceeding the outer circumference of the pipe material. It is provided in the area and has anti-corrosion measures.

In the case of the diameter-expanding body 26 of (5A), it is not necessary to use a separate diameter-expanding body, and the relay member 25 is used to form a deformed portion deformed in a diameter-expanded shape. In the above piping work shown in FIG. 9, by bringing the deformed portion into contact with the inner wall of the existing pipe, the contacting portion of the connecting pipe as a whole becomes intermittent and can be smoothly inserted into the pipe with a small pulling force. As a result, the outer peripheral portion of the pipe material is not damaged, and the laying pipe having excellent durability can be performed.

In the case of the connecting pipe (5C), the relay members 28 and 29 fixed to each end pipe portion include the diameter-expanding bodies 30 and 31 whose diameters are expanded in the welded portions. The relay members 28 and 29 are made of a pipe material that can be fitted to the end pipe portion like the relay member 3 in the case of FIG. 2, and the pipe materials 1a and 1b are connected via the relay member 25. The diameter-expanded bodies 30 and 31 are expanded so as to be located outside the outer circumference of the pipe material. The pair of relay members 28, 29 are butted and welded together. Similar to the case of FIG. 2, in the gaps formed on the relay members 28 and 29 between the bellows portion 6 and the diameter-expanding body 26, the anticorrosion layer 32 having a thickness not exceeding the outer circumference of the pipe material 33 is provided in a filled form, and anticorrosion measures are taken.

In the case of the diameter-expanding bodies 30 and 31 of (5C), it is not necessary to use a separate diameter-expanding body as in the case of the diameter-expanding body 26 of (5A), and the diameter is expanded by using the relay members 28 and 29. Since it is configured by forming a deformed deformed portion, in the above-mentioned piping work shown in FIGS. 7 to 9, by contacting the deformed portion with the inner wall of the existing pipe, the portion where the connecting pipe as a whole abuts is It becomes intermittent and can be smoothly inserted into the pipe with a small pulling force, the outer peripheral portion of the pipe material is not damaged, and the laying pipe having excellent durability can be performed. The diameter-expanding body 17 and the like are not limited to the case where they are composed of a single shaft member, and can be divided into halves and integrated with a plurality of members, for example.

The connecting pipes of FIGS. 1 to 5 have a connecting structure in which the pipe materials are indirectly connected via a relay member, but the present invention has a direct connecting structure (so-called potato) in which the pipe materials are directly connected without using the relay member. It can also be applied to connecting pipes (joint structures).

(10A) and (10B) of FIG. 10 show diameter-expanding bodies K1 and K2 used for a connecting pipe having a directly connected structure, respectively.

As the connecting pipe of the connecting structure connected via the relay member, a bellows pipe having a reduced diameter end portion as shown in the terminal portion 8 is used. On the other hand, the connecting pipe having a direct connection structure has a connecting structure in which bellows pipes B1, B2, or B5 and B6, which do not have a reduced diameter end portion such as the terminal portion 8, are welded and connected to each other. In the case of (10A), a part of the ends B3 and B4 of the bellows tubes B1 and B2 is removed, and the enlarged diameter body K1 is inserted in the gap facing the removed portions. The enlarged diameter body K1 is composed of a ring-shaped shaft member. The enlarged diameter body K1 is welded in a state of being inserted into the gap. Reference numerals m1 and m2 in (10A) indicate welded portions between the enlarged diameter body K1 and the ends B3 and B4 of the bellows tubes B1 and B2. The ridgeline on the outer circumference of the diameter-expanding body K1 is larger than the outer circumference of the bellows pipes B1 and B2. A protective material 6a is adhered to the outer circumferences of the enlarged diameter body K1 and the bellows tubes B1 and B2.

In the case of (10B), the ends of the bellows tubes B1 and B2 are abutted and welded at the bottoms of the bellows B7 and B8. Reference numeral m3 of (10B) indicates a welded portion between the ends of the bellows bottoms B7 and B8. A ring-shaped enlarged diameter body K2 is inserted into a recess formed by welding the ends of the bellows tubes B1 and B2. The outer circumference of the diameter-expanding body K2 is larger than the outer circumference of the bellows tubes B5 and B6. A protective material 6a is adhered to the outer circumferences of the enlarged diameter K2 bellows tubes B5 and B6.

In each of the enlarged diameter bodies K1 and K2 of (10A) and (10B), the outer circumference of the enlarged diameter body is made larger than the outer circumference of the pipe material as in the case of the enlarged diameter body in the connecting pipe of FIGS. In the insertion state described in 8, the pipe can be brought into contact with the inner wall of the pipe path. 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. Therefore, it can be smoothly inserted into the pipe with a small pulling force, the outer peripheral portion of the pipe material is not damaged, and the laying pipe having excellent durability can be performed. For the enlarged diameter bodies K1 and K2, not only a solid metal material but also a hollow metal material can be used.

In the case of the above embodiment, for example, in the diameter-expanded body 17 shown in FIG. 2, the entire outer peripheral portion is located outside the peripheral surface of the pipe material, but it can be partially located outside.

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

Like the diameter-expanding body 17, the diameter-expanding body 14 has a length shape extending over the outer circumference of the connecting portion between the pipe members, an inner diameter portion 14b that fits into the connecting portion, and an overall ring-like shape. Further, the outer peripheral ridge line 14
Eight recesses 18 that are radially recessed along a are provided. The recess 18 can be formed by partially tapping or cutting the outer circumference of the shaft material or the pipe material. Similar to the diameter-expanding body 17, when the diameter-expanding body 14 is attached to the connecting portion between the pipe materials, the outer peripheral ridge line 14a is located outside the outer circumference of the pipe material. According to the enlarged diameter body 14, the outer peripheral ridge line 14a is divided by the concave portion 18 and the outer peripheral portion becomes discontinuous, so that the contactable area with the existing pipe inner wall is reduced as compared with the enlarged diameter body 17, and the insertion work is smoother. It can be performed. The means for reducing the contactable area of the enlarged diameter body is not limited to the recess 18, and for example, a wavy portion formed along the outer peripheral ridge line 14a, a large number of holes recessed in the outer peripheral surface, and the like can be used. ..

It should be noted that the present invention is not limited to the above-described embodiment, and includes various modifications, design changes, etc. within the range that does not deviate from the technical idea of the present invention. Nor.

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

1 Connecting pipe 1a Pipe material 1b Pipe material 1c Pipe material 1d Pipe material 1e Pipe material 1f Pipe material 1g Joint part 1h Joint part 1i Joint member 2a Diameter expansion body 2b Diameter expansion body 2c Diameter expansion body 2d Diameter expansion body 2e Diameter expansion body 3 Relay member 5 Wire 6 Bellows part 6a Protective material 7 Bellows part 8 End part 9 Blade material 10 Disk 11 Ring body 12 Protective material 13 Welded part 14 Diameter expanded body 14a Outer ridge line 15 Welded part 16 Welded part 17 Diameter expanded body 18 Recess 19 Corrosion protection Layer 20 Inclined portion 21 Welded portion 22 Welded portion 23 Diameter-expanded body 24 Diameter-expanded body 25 Relay member 26 Diameter-expanded body 27 Corrosion-proof layer 28 Relay member 29 Relay member 30 Diameter-expanded body 31 Diameter-expanded body 32 Corrosion-proof layer 33 Corrosion-proof layer 34 Expansion Diameter a Underground b Paved road c Sidewalk d Vertical shaft e Central pipeline e1 Cutting port e2 Cutting port f Pipe line g Joining member h Joining member i Connecting pipeline S Connecting point ML Welding line EP Pipe end W1 Winding device W2 winding Taking device K1 Diameter expander K2 Diameter expander 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 Welded part m3 Welded part

Claims (7)

A connecting pipe that can be arranged in an inserted state by connecting a plurality of pipe materials, inserting one end from the pipe entrance of the pipe, and pulling out from the pipe outlet.
The pipe material is composed of a flexible pipe that can be flexed.
A connecting means for directly or indirectly fixing the end pipe portions of each pipe material to connect the pipe materials,
It has one or two or more diameter-expanding bodies provided on the outer periphery of the connecting portion and / or the periphery thereof by the connecting means.
The outer periphery of the enlarged diameter body is positioned outside the peripheral surface of the pipe material so that it can come into contact with the inner wall of the pipe passage in the inserted state .
It has a relay member that fits into the end pipe of each pipe material that is connected to each other.
The connecting means connects the pipe materials via the relay member.
The diameter-expanded body is a connecting pipe characterized in that a part of the relay member is formed by a deformed portion deformed in a diameter-expanded shape. The connecting pipe according to claim 1, wherein the enlarged diameter body has a length shape covering a part or the entire circumference of the outer periphery of the connecting portion, and the shape of the vertical cross section has an arc shape. The connecting pipe according to claim 1 or 2, wherein the enlarged diameter body has a length extending over the outer circumference of the connecting portion and has a ring-like shape. The enlarged diameter body is composed of a plurality of sets of shaft members having an arcuate outer circumference.
Claims 1 to 3 in which each of the plurality of sets of shaft members is vertically arranged and fixed 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 flexible tube is composed of a bellows tube.
The connecting pipe according to any one of claims 1 to 4 , further comprising each bellows pipe of a plurality of connected pipe materials and a blade material for preventing bellows extension / deformation that covers the outer periphery of the enlarged diameter body. The connecting pipe according to any one of claims 1 to 5 , wherein an anticorrosion layer having a thickness not exceeding the outer circumference of the pipe material is provided in a gap formed between the end pipe portion and the enlarged diameter body. The laying method for laying the connecting pipe according to claim 1, wherein the buried portion of the existing pipeline is excavated, the end of the existing pipe exposed by the excavation is cut, and the connecting pipe is pulled out to one end of the connecting pipe. The connecting pipe is inserted into the existing pipeline by attaching a member, inserting one end of the connecting pipe from one cutting port of the existing pipe, and pulling out from the other cutting port through the drawing member. A method of laying a connecting pipe, which comprises arranging.

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