JPH0510890U - Gas tube for buried piping - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a gas tube for buried piping, which has excellent flexibility, pressure resistance and durability, and in particular, has improved workability of piping for buried portions having steps and airtightness / durability of piping joints. . [Structure] A gas tube for a buried pipe having a basic structure in which a resin flexible tube 13 is arranged outside a rubber tube 12 having a reinforcing layer 11, and a joint 14 for joining is provided at a terminal portion of the gas tube. 10, the rubber pipe 12 and the resin flexible pipe 1 from the contact portion between the joint 17 and the rubber pipe 12 at the end portion.
3, the mounting pipe 15 is fixed, the outside of the resin flexible pipe 13 at the end portion is covered with a resin case 16, and a filling material 17 is filled between the resin case 16 and the mounting pipe 15. It is characterized by Not only does the gas tube have high flexibility and excellent piping workability, but it also has a good airtight seal at the joint.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  This device is used for buried pipes used for pipes such as city gas and propane gas. Regarding the improvement of the tub, more specifically, it has excellent flexibility, pressure resistance and durability, Improved piping workability and air tightness / durability of pipe joints for buried parts with steps The present invention relates to a gas tube for buried piping.

[0002]

[Prior art]

  Generally, the combustion gas is supplied to household gas combustion equipment such as a gas stove. As the feeding means, the mode as shown in FIG. 3 is adopted.

[0003]   That is, in FIG. 3, reference numeral 1 denotes a liquefied propane gas cylinder or the like arranged outdoors. Gas supply equipment, 2 is a distributor, 3a and 3b are microcomputer gas meters, 4a and 4b Is a gas stove, and each of these devices is equipped with gas pipes 5a to 5h for piping. They are connected to each other, and in the drawing, one gas supply facility 1 to multiple (two) houses Combustion gas is supplied to the homes A and B.

[0004]   However, in the combustion gas supply means as shown in FIG. Most of the tubes 5a-5h, for example, the gas tubes 5b, 5c, 5d for piping, It is buried in the ground and is routed to each of the houses A and B. If there is a step in house B, a step should also be placed between the buried gas tubes for piping 5b and 5d. In order to make a difference, a large number of bent portions 6a are provided on the gas tubes 5b, 5c, 5d for piping. It was necessary to provide 6b, 6c, 6d and 6e.

[0005]   Therefore, the demand for gas tubes for piping used for such underground burial The performance is excellent in flexibility and does not cause problems such as breaking in the middle of piping. Easy to handle, excellent in pressure resistance, excellent in durability, when buried Excellent in piping workability and excellent in airtightness and durability of piping connection And so on.

[0006]   However, conventional gas pipes for buried piping are The mainstream of these is coated polyethylene tubes, which have insufficient flexibility. Therefore, not all the above required performances are satisfied, and as shown in FIG. When performing piping work on an embedded part with steps, it is necessary to provide many bent parts. Therefore, not only is it inferior in piping workability, but it is also necessary to use underground pipes to prevent earthquakes and landslides. When stress is applied, the gas from the buried pipe and its joint will It included problems such as easy leaks and security concerns.

[0007]

[Problems to be solved by the device]

  This invention solves the above-mentioned problems of the conventional gas tube for buried piping. It was achieved as a result of examination for

[0008]   Therefore, the purpose of this invention is to have excellent flexibility, pressure resistance and durability. Piping workability and air tightness / durability of pipe joints for buried parts with steps are improved. It is to provide a good gas tube for buried piping.

[0009]

[Means for Solving the Problems]

  In order to achieve the above-mentioned object, the gas pipe for buried piping of the present invention has a reinforcing layer. Basically a gas tube made by arranging a flexible resin tube on the outside of a rubber tube that has A gas for buried piping that has a structure and a joint for joining at the end of this gas tube. From a contact portion between the joint and the rubber pipe in the tube, which is a tube It is common to fix the mounting pipe between the rubber pipe and the resin flexible pipe. In, covering the outside of the resin flexible tube in the terminal portion with a resin case, A filling material is filled between the resin case and the mounting pipe.

[0010]

[Action]

  The gas tube for buried piping of the present invention is a rubber tube having a reinforcing layer and good pressure resistance. Since it is configured by coating and arranging a resin flexible pipe on the outside, flexibility is increased. It is extremely good and can be easily bent, especially for buried parts with steps. Not only the workability for piping is excellent, but the rubber pipe is replaced with the resin flexible pipe. By covering more, durability can be improved.

[0011]   In addition, connect the connecting part of the joint of the gas pipe for buried piping with the joint to the mounting pad. Since the airtight seal is made through the pipe, filler and resin case, It has good durability and pressure resistance and may cause gas leakage due to external stress. It has excellent security reliability.

[0012]

【Example】

  Hereinafter, referring to the drawings, an embodiment of a gas tube for buried piping of the present invention will be described. Will be described in detail.

[0013]   FIG. 1 is an explanatory sectional view showing an embodiment of a gas tube for buried piping of the present invention, and FIG. 2 is It is an expanded sectional view of the rubber tube in FIG.

[0014]   In the embodiment shown in FIG. 1, the buried pipe gas tube 10 of the present invention is a A rubber tube 12 having a strong layer 11 and a resin tube provided on the outside of the rubber tube 12 so as to cover it. The basic structure is a gas tube composed of the flexible tube 13.

[0015]   The joint 1 is attached to the end portion of the buried pipe gas tube 10 as the joint. No. 4 is connected, but this joint is formed from the abutting portion of the joint 14 and the rubber pipe 12 as described above. A metal mounting pipe 15 is provided between the rubber pipe 12 and the resin flexible pipe 13. Is fixed by a method such as caulking, and further outside the resin flexible pipe 13. A resin case 16 is covered on the resin case 16 and the mounting pipe 15 It has a structure in which a filling material 17 is filled in between.

[0016]   As shown in the enlarged view of FIG. 3, the rubber tube 12 includes an outer rubber layer 12a and an inner rubber layer. 12b, a metal net (cylindrical wire net) as the reinforcing layer 11, a synthetic resin net. The basic structure is a rubber tubular body that incorporates a filamentous body and a synthetic fiber mesh body. .

[0017]   The rubber compound forming the rubber tube 12 is EDP or NB. Additives such as softeners, processing aids, anti-aging agents and stabilizers to rubber such as R What was added is used as a method for manufacturing the rubber tube 12 from this rubber pound. The rubber compound together with the reinforcing layer 11 for normal insert extrusion molding. The method of doing is mentioned.

[0018]   The resin flexible tube 13 is made of a flexible synthetic resin material such as special polyethylene. And preferably formed into a bellows shape as shown, so It has excellent performance and does not cause problems such as breakage in the middle of piping. There is.

[0019]   The resin flexible pipe 13 is formed by bending the gas pipe 10 for buried piping. In order to eliminate obstacles when the rubber tube 12 It is covered.

[0020]   Gas pipe for buried piping having the rubber pipe 12 and the resin flexible pipe 13 as a basic structure In the tube 10, the flexibility of the rubber tube 12 and the resin flexible tube 13 act synergistically. Therefore, it can be bent easily because it exhibits ideal flexible performance. And the workability of the piping when buried is excellent, and the rubber pipe 12 is reinforced by the reinforcement layer 11. Therefore, the pressure resistance is good, and furthermore, the flexible resin tube 13 allows the rubber The tube 12 is protected and therefore extremely durable.

[0021]   Further, the joint 14 connected to the terminal joint portion of the gas tube 10 for buried piping is , Copper alloy, etc., and the diameter of the connection part with the gas pipe 10 for buried piping is It is formed to be slightly larger than the inner diameter of the tube 12.

[0022]   When connecting the joint 14 to the rubber tube 12, a metal such as aluminum should be used. Alternatively, it is made of metal such as stainless steel and has an inner diameter almost equal to the outer diameter of the rubber tube 12. Attach the mounting pipe 15 to the stopper portion 14a of the joint 14 and the end portion of the rubber tube 12. Inserted in advance from the contact portion between the rubber tube 12 and the resin flexible tube 13, Next, the mounting pipe 15 is fixed to the joint by a method such as caulking.

[0023]   Next, on the outer side of the resin flexible pipe 13, made of polyethylene or the like, A resin case 16 having an inner diameter substantially equal to the maximum outer diameter of the oil flexible tube 13 is covered. Then, between the resin case 16 and the mounting pipe 15, a silicone compound Filling with a filler material 17 such as a bond forms a joint with high airtightness To be done.

[0024]   The joint portion of the gas pipe 10 for buried piping having the above-described configuration is attached to the mounting pipe 15 And the filling material 17 improve the airtight seal and prevent the gas tube for buried pipe from coming off. It has been designed to stop, and buried pressure and external stress such as earthquakes and landslides. The gas tube 10 for buried piping is sufficiently protected from the problem, and problems such as gas leakage are eliminated. As a result, security reliability can be improved.

[0025]   In addition, the resin case 16 prevents invasion of dust, dust and water. At the same time, the filler 17 protects the terminal joint of the gas pipe 10 for buried piping. As a result, the airtightness, pressure resistance and durability of the joint will be further improved. .

[0026]

[Effect of device]

  As explained above, the gas pipe for buried piping of the present invention is extremely flexible. Good and easy to bend, especially for buried parts with steps Not only the workability of piping is excellent, but also the durability can be improved.

[0027]   Also, airtightness, durability and pressure resistance at the joint of the gas tube for buried piping Is good, does not cause gas leakage due to external stress, and in terms of security Has excellent reliability.

[0028]   Therefore, the gas pipe for buried piping of the present invention makes use of the above characteristics, In addition to combustion gas such as city gas and liquefied propane gas, It is useful as a tube for commercial gas piping.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view showing an embodiment of a gas tube for buried piping of the present invention.

FIG. 2 is an enlarged cross-sectional explanatory view of the rubber tube in FIG.

FIG. 3 is an explanatory view showing a means for supplying combustion gas to a domestic gas combustion apparatus.

[Explanation of symbols]

10 Gas tube for buried piping 11 Reinforcing layer 12 rubber tubes 13 resin flexible tube 14 Joint 15 Mounting pipe 16 resin case 17 Filling material

Claims (2)

[Scope of utility model registration request] 1. A gas tube for buried piping, which has a basic structure of a gas tube in which a resin flexible tube is arranged outside a rubber tube having a reinforcing layer, and which has a joint for joining at a terminal portion of the gas tube. And fixing a mounting pipe from the contact portion between the joint and the rubber pipe in the terminal portion to between the rubber pipe and the resin flexible pipe, and a resin case on the outside of the resin flexible pipe in the terminal portion. And a filling material filled between the resin case and the mounting pipe. 2. The gas pipe for buried piping according to claim 1, wherein the resin flexible pipe is a bellows pipe made of a flexible synthetic resin material.