JP3400687B2 - Piping material and piping method using this piping material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piping material including a gas conduit and a piping method performed using this piping material.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 1, a method of piping a gas conduit in the soil is as follows. After backfilling with sand 03, sprinkle gravel layer 04 on top of this, and then, if a gas leak occurs on it, odor tube 05 for detecting gas
After installing multiple cable protection tubes 06 for inserting communication cables or optical fibers, etc., lay a protective iron plate 07 to prevent damage due to another construction, and finally backfill the upper part with sand or sand. I was going. However, this method has drawbacks that it requires a great deal of time, labor, and expense for excavating and backfilling the buried trench, and that traffic control and safety measures must be taken for construction on the road. It was As an attempt to improve such a work problem, Japanese Patent Laid-Open No. 5-280664 proposes a piping material and a piping method having a double pipe structure of an inner pipe and an outer pipe.

[0003]

However, in the pipe material of the double pipe structure proposed by this known method, the filler layer is formed in advance between the inner pipe and the outer pipe (protective pipe). Since the inner tube is constrained inside the outer tube, it is difficult to move the inner tube freely. Therefore, it had the following problems. That is, in the pipe material in which the filler layer is formed in the pipe, (1) the groove cannot be aligned during or after backfilling, and (2) when backfilling is performed during welding, the There is a concern that vibration may adversely affect the welding quality. (3) When welding was performed after backfilling, there were problems such as tensile residual stress in the inner pipe. Therefore, an object of the present invention is to propose a piping material and a piping method for solving the above problems that the conventional technology has,
In particular, it is an object of the present invention to provide a piping member that enables the inner pipe to be easily moved when welding the inner pipe serving as a gas conduit or the like, and a piping method using the piping member.

[0004]

The essential structure of the present invention is as follows. (1) An inner tube and an outer tube for protecting the inner tube having a double tube structure, wherein the inner tube does not directly contact the outer tube, and a smaller diameter than the outer tube inner diameter for holding the movable state, double around
Two or more ring-shaped support members provided with several protrusions are attached, the length of the inner pipe is made larger than the length of the outer pipe, and the inner pipe is arranged to project at both ends in the length direction of the outer pipe. A pipe material with a double pipe structure characterized by the above.

(2) A double-pipe structure having an inner pipe and an outer pipe for protecting the inner pipe, wherein the inner pipe is
Without this inner tube is in direct contact with the outer tube, and met a smaller diameter than the outer tube inner diameter for holding the movable state
The ring-shaped support member with a plurality of protrusions around it.
Install one or more pipes, one of which is a cable protection pipe, an odor pipe, or a filling pipe, in the gap between the inner pipe and the outer pipe. A pipe material having a double pipe structure, characterized in that the inner pipe is arranged so as to be larger than the inner pipe so as to project at both ends in the length direction of the outer pipe.

[0006]

(3) A pipe groove is excavated from the ground, and the pipe material of the double pipe structure described in (1) or (2) above is dropped into the pipe groove, and then the inner pipe welding site is removed. Backfill the pipe groove,
During or after backfilling, the inner pipes are welded to each other and, if necessary, one or more pipes of a cable protection pipe, an odor pipe and a filling pipe are connected, and then an outer pipe is connected by a connecting member, and then , A piping method characterized by backfilling a pipe groove in a welding hall of an inner pipe.

(4) The piping method according to (3), wherein two half-split tubular bodies are used as connecting members, and the outer tubes are connected to each other.

(5) The piping method according to the above (3), wherein a tubular body is used as the connecting member, and the outer tubes are connected to each other.

(6) The piping method according to (3) , wherein a band-shaped body is used as the connecting member, and the outer tube is connected to each other by winding the band-shaped body around the outer tube.

(7) After connecting the outer pipe and backfilling the pipe groove, the filling material is injected and filled through the filling pipe into the space formed between the inner pipe and the outer pipe. Above
The piping method according to any one of (3) to (6) .

[0012]

The present invention will be described in detail with reference to the drawings. 2 and 3 respectively illustrate a longitudinal section and a transverse section of the piping material according to the present invention. Reference numeral 1 is an inner tube used as a gas tube, 2 is an outer tube for protecting the inner tube, and 3 is a ring-shaped support member for supporting the inner tube so as not to directly contact the outer tube. Further, if necessary, one or more kinds of pipes such as a cable protection pipe and an odor pipe shown by reference numeral 4 and a filling pipe shown by reference numeral 5 can be appropriately arranged in this piping material. Then, as shown in FIG.
The length of the inner pipe is made larger than the length of the outer pipe, and the inner pipe is arranged so as to project at both ends in the length direction of the outer pipe.

The length of the inner pipe is made larger than the length of the outer pipe,
The reason why both ends of the inner pipe 1 are projected from both ends of the outer pipe 2 is mainly to secure a working space for welding. Both ends of the inner pipe are usually pre-grooved for welding.
Process 1a and 1b. The ring-shaped support member 3 is necessary to prevent the inner pipe and the outer pipe from coming into direct contact with each other and to secure a space filled with a filling material (such as bubbled mortar) described later. From this point, it is desirable that the support member has a plurality of protrusions around the ring, as shown in FIG. Further, the number of supporting members is required to be two or more for one inner pipe in order to keep the inner pipe parallel to and substantially along the outer pipe.

Next, a piping method using the above-mentioned piping material will be described. First, a pipe groove is excavated along the pipe line from the ground, and the pipe material is laid down in the pipe groove. At this point, backfilling becomes possible except for the meeting place where the inner pipe of each piping material is welded, and normally backfilling is performed in this state. After backfilling or in parallel with the backfilling work, the inner pipes are grooved and welded to each other as shown in the connection portion of FIG. Also, provided as needed,
A cable protection pipe, a filling pipe, and the like are connected by a connecting pipe 6, and then an outer pipe is connected by a connecting member 7. Here, in place of the above work procedure, after unloading the piping material, aligning the groove of the inner pipe and welding, after completing all the connections of the connection pipe and the connection by the connection member, All backfilling including may be performed.

In connecting the outer pipe 2, two connecting members 7 each having a half-divided tubular body as shown in FIGS. 5 and 6 are used, and the outer pipe is backfilled by aligning the upper and lower ends thereof. Alternatively, the method may be such that it is fixedly connected to the outer tube by an appropriate method such as bolts, welding, or an adhesive and then backfilled. In addition, as shown in FIG. 7, the connection member 7 of the tubular body is previously fitted to the outside or the inside of the outer pipe before laying, and after the inner pipe is welded, the tubular body is slid to the welding hall. By doing so, the outer tube may be connected. The latter method is advantageous in workability when the diameter of the outer tube is large and the weight of the connecting member is large. In addition, when water leakage is required at the connection part of these outer pipes, or when it is desired to prevent leakage of filling material (filling agent), between the outer pipe and the connecting member, and in the case of a half-divided tubular body. Is fixed by sandwiching a water-expandable rubber at the joint.

When connecting the piping material of the present invention to an existing piping material, as shown in FIG. 8, depending on the installation accuracy of the outer tube, the inner tube and the outer tube, and the outer tube and the outer tube may be connected. Misalignment may occur in the. In such a case, using a band-shaped member as the connecting member facilitates the construction. Especially,
When waterproofness for injecting and filling air mortar is required, it is desirable that the material of the band-shaped body has appropriate flexibility and elasticity and can enhance the sealing property. FIG. 9 shows, as a connecting member, a corrugated zinc-iron plate 7A on the first layer on the outer tube side.
Is an example in which the rubber sheet 7B is used for the second layer on the outer side. Here, the corrugated zinc-iron plate mainly acts to prevent deformation during backfilling, and the rubber sheet mainly acts to stop water. As shown in FIG. 9, these strips are wound around the outside of the outer tube, and in order to enhance the water blocking performance, two ends of the connection portion of the strips in the pipe length direction are fastened and fixed by steel bands 8. In this case, as shown in FIG. 9, it is desirable to further mount a half-tube shaped protective cover on the upper part of the connection part to prevent deformation of the connection part during backfilling and to serve as a protective iron plate. .

After connecting the outer pipes by each of the above methods, the hall may be backfilled immediately, but a simple lining plate is laid on the hall to release night traffic, and then backfilled together. By taking measures, it is possible to improve work efficiency.

As described above, in the piping material of the present invention, since the inner pipe has the double pipe structure in which the inner pipe is held in the outer pipe so as to be movable in all directions, even during backfilling or after backfilling. It is possible to move the inner tube within the outer tube, or move the cable protection tube, the odor tube, the filling tube, etc., which are inserted in the gap between the inner tube and the outer tube. Therefore, it is possible to avoid the problems in the groove alignment and welding of the inner pipes and the troubles in the connection of the cable protection pipe, the odor pipe, the filling pipe, etc.

Furthermore, after the arrangement of the inner pipe, the cable protection pipe, the odor pipe, the filling pipe, etc. is completed by the above method, the outer pipe is connected, and the pipe groove is backfilled, the space inside the outer pipe is filled. A filling material for fixing each tube arranged in the outer tube through the filling tube is injected and filled. As the filling material (filling material), bubble-containing mortar (air mortar) is usually used. The filling tube does not need to be charged over the entire length of the piping material, and the charging length may be determined within a range that allows the filling material to reach almost the entire length of the space inside the outer tube.

As is clear from the above description, the following advantages can be obtained by using the piping material according to the present invention for piping. Since the inner pipe, the outer pipe, and, if necessary, the cable protection pipe, the odor pipe, and the filling pipe are integrated, they need only be laid in the pipe groove as they are. Therefore, unlike the conventional method, it is not necessary to lay an inner pipe, then an odor pipe or a cable protection pipe, cover a protective iron plate, and then backfill, and also scatter gravel for odor collection. Absent. Therefore, the labor, time, and cost required for piping can be significantly reduced. Since the inner pipe and its welded portion are protected by the outer pipe or the connecting member in the entire circumferential direction, there is no fear of being damaged by other construction. Since the piping material has a double pipe structure and the inner pipe is held in the outer pipe so that it can be moved in all directions, it does not move or remain in the inner pipe even during or after backfilling. It is possible to move the cable protection tube, odor tube, and filling tube inserted between the outer tube and the outer tube. Therefore, there is no problem in work in aligning the groove of the inner tubes, welding, connecting the cable protection tube, the odor tube, and the filling tube. In addition, problems such as adverse effects on the quality of the welded part due to the addition of earth and sand or vibration due to a compactor when backfilling during welding and the occurrence of tensile residual stress in the inner pipe due to welding after backfilling do not occur. Therefore, after laying the pipe material in the pipe groove, it is possible to perform backfilling immediately except for the meeting place where the inner pipes of each pipe material are welded. Then, the backfilling work and the pipe connecting work can be carried out in parallel, and the construction time can be greatly shortened. If only the parliamentary section is covered with a lining board, the entire line can be backfilled and traffic can be released safely at night. Since the pipe material can be installed in the pipe groove immediately after excavation and backfilled immediately, construction by simple mountain retaining is possible. By using a connecting member such as a tubular body, two half-divided tubular bodies, or a strip-shaped body to cover and connect a part of the outer pipe, it is possible to omit the protective iron plate for protecting the connecting portion of the outer pipe. In addition, it becomes possible to perform the filling work of air mortar and the like into the space between the outer pipe and the inner pipe at a time by using the intermediate filling pipe in a state where a plurality of pipes are connected.

[0021]

As described above, according to the present invention,
Since the pipe material has a double pipe structure in which the inner pipe is contained inside the outer pipe, and if necessary, the cable protection pipe, the odor pipe, and the filling pipe are housed, this pipe material is laid in the pipe groove as it is. As a result, partial backfilling work can be performed, and the work efficiency of the entire piping work can be greatly improved. In addition, the inner tube, or the cable protection tube, odor tube, and filling tube are held in the outer tube so that they can move freely, so that the groove of the inner tube can be maintained during or after backfilling. It enables easy connection, welding, and connection of various pipes, improving workability, and reducing the quality of welded parts and residual stress. Furthermore, by using a connecting member such as a tubular body, two half-divided tubular bodies, or a strip for connecting the outer pipe, the connecting portion of the outer pipe can be protected, and in the state where a plurality of outer pipes are connected, The filling work of air mortar etc. can be carried out all at once through the filling tube.

[Brief description of drawings]

FIG. 1 is a diagram showing a method of burying a gas conduit according to the prior art.

FIG. 2 is a vertical sectional view of a piping material according to the present invention.

FIG. 3 is a cross-sectional view of a piping material according to the present invention.

FIG. 4 is a vertical cross-sectional view showing respective states of welding the inner pipe, connecting the cable protection pipe and the filling pipe, and connecting the outer pipe.

FIG. 5 is a perspective view showing a connected state of an outer tube using a half-split tubular body.

FIG. 6 is a view showing a connecting member for an outer pipe of a half-tube type.

FIG. 7 is a view showing a connecting member for an outer tube by a sliding method of a tubular body.

FIG. 8 is a diagram for explaining misalignment when a pipe material is laid.

FIG. 9 is a view showing a connected state of the outer pipe by the band-shaped body.

[Explanation of symbols]

1 inner tube 2 outer tube 3 Support members 4 Cable protection tube 5 filling tube 6 connecting pipe 7 Connection member 7A Corrugated sheet Zinc iron plate 7B rubber sheet 8 steel band 9 Protective cover

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hidehiko Koizumi 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Within Kawasaki Steel Corporation (72) Inventor Fumio Kagaya 2-3-2 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. (72) Inventor Yahito Higuchi 2-3 2-3 Uchisaiwaicho, Chiyoda-ku, Tokyo Kawasaki Steel Co., Ltd. (72) Inventor Mitsutoshi Hayashi 1581-20 Hongo-cho, Omiya-shi, Saitama Prefecture (72) Takashi Anamizu 21 Itogaya Noto-cho, Shinjuku-ku, Tokyo 404 Hidden Ichigaya Noto-cho (72) Inventor Takeshi Kohara 2-4-17 Sarue, Koto-ku, Tokyo Fukukawa Single Dormitory (72) Takahiro Kawaguchi 1-13-Nakameguro, Meguro-ku, Tokyo 21 Urban Heights Nakameguro B-211 (72) Inventor Collection Minoru 2-10-9 Izumi, Suginami-ku, Tokyo (72) Inventor Yuji Fukushima 1188 Manashi Oshidate, Inagi-shi, Tokyo Mansho Kamiya 302 (72) Inventor Taro Sasaki 3-18-7 Nagatakita, Minami-ku, Yokohama-shi Kanagawa (72) Inventor Akira Adachi 2-9-7 Ikenohata, Taito-ku, Tokyo Kawatetsu Techno Construction Co., Ltd. (72) Inventor Kazuhiko Taniguchi 2-9-7 Ikenohata, Taito-ku, Tokyo (72) Inventor Jiro Omura 2-9-7 Ikenohata, Taito-ku, Tokyo (72) Inventor, Kawatetsu Techno Construction Co., Ltd. Nakanishi Eiaki 2-9-7 Ikenohata, Taito-ku, Tokyo Kawakawa Techno Construction Co., Ltd. (56) References JP-A-5-280664 (JP, A) JP-A-8-320088 (JP, A) JP-A 64-63906 (JP, A) Japanese Patent Publication 6-97074 (JP, B2) Japanese Patent Publication 61-17596 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 1/00

Claims (7)

(57) [Claims] 1. A double pipe structure comprising an inner pipe and an outer pipe for protecting the inner pipe, wherein the inner pipe is in direct contact with the outer pipe. And a diameter smaller than the inner diameter of the outer tube for holding the movable state ,
A state in which two or more ring-shaped support members provided with a plurality of protrusions around the periphery are attached, the length of the inner pipe is made larger than the length of the outer pipe, and the inner pipe projects at both ends in the length direction of the outer pipe. A pipe material with a double pipe structure characterized by being placed in 2. A double pipe structure comprising an inner pipe and an outer pipe for protecting the inner pipe, wherein the inner pipe is in direct contact with the outer pipe. And a diameter smaller than the inner diameter of the outer tube for holding the movable state ,
Attach two or more ring-shaped support members with multiple protrusions around them, and at least one type of cable protection tube, odor tube, and filling tube between the inner tube and the outer tube. A pipe material having a double pipe structure, which is inserted and supported, and the length of the inner pipe is made larger than the length of the outer pipe, and the inner pipe is arranged to project at both ends in the length direction of the outer pipe. . 3. A pipe groove is excavated from the ground, and the pipe groove is contracted.
After lowering the pipe material of the double pipe structure according to claim 1 or 2, the pipe groove is backfilled except for the welding site of the inner pipe, and the inner pipes are welded to each other during or after the backfilling, which is required. To connect at least one of a cable protection tube, an odor tube, and a filling tube, then connect the outer tube with a connecting member, and then backfill the pipe groove of the welding site of the inner tube. Characteristic piping method. 4. Two half-split tubular bodies are used as connecting members,
The piping method according to claim 3, wherein the outer pipes are connected to each other. 5. The piping method according to claim 3, wherein a tubular body is used as the connecting member, and the outer tubes are connected to each other. 6. The piping method according to claim 3, wherein a band-shaped body is used as the connecting member, and the outer tube is connected to each other by winding the band-shaped body around the outer tube. 7. An outer pipe is connected and the pipe groove is backfilled, and then a filling material is injected and filled through a space filling pipe into a space formed between the inner pipe and the outer pipe. Claim 3 ~
The piping method according to any one of 6 above.