An underground natural gas pipeline

Abstract

This utility model discloses an underground natural gas pipeline, including a pipeline body, a connecting assembly at one end of the pipeline body, a flange installed at the end of the pipeline body, a support assembly at the bottom of the pipeline body, a limiting seat installed at the bottom of the pipeline body, a ground spike installed under the limiting seat, and a protective assembly on the outside of the flange, including a protective cover installed on the outside of the flange. In this underground natural gas pipeline, the limiting seat is driven deep into the underground soil via ground spikes to prevent the support from loosening and causing pipeline displacement. The protective cover, installed on the outside of the flange, not only reduces the stress at the pipeline connection point, lowering safety hazards, but also directly isolates the external environment from contact with the flange and the first bolt structure, preventing oxidation and rust at the pipeline body connection point and extending the service life of the pipeline body.

Description

Technical Field

[0001] This utility model relates to the technical field of natural gas pipelines, specifically to an underground natural gas pipeline. Background Technology

[0002] Natural gas pipelines are pipelines that transport natural gas from extraction sites or processing plants to urban gas distribution centers or industrial users. However, existing underground natural gas pipelines still have certain defects in use. During use, ordinary natural gas pipelines often have problems such as difficulty in positioning and installation and difficulty in splicing, which makes the operation of pipeline installation cumbersome and the work efficiency low.

[0003] To overcome the above-mentioned defects, the prior art (Chinese patent with announcement number CN213929703U, announcement date August 10, 2021) provides a corrosion-resistant natural gas pipeline, including a first assembly plate, positioning supports, a pipe body, and reserved blocks. One end of the pipe body is provided with the first assembly plate, and the other end of the pipe body is provided with a second assembly plate that matches the first assembly plate. Reserved blocks are uniformly welded to the end of the second assembly plate away from the pipe body, and reserved grooves matching the reserved blocks are uniformly welded to the end of the first assembly plate away from the pipe body. By installing the pipe body, the first corrosion-resistant protective layer, and the second corrosion-resistant protective layer, when the natural gas pipeline is in use, the second corrosion-resistant protective layer is provided on the inner wall of the pipe body, and the first corrosion-resistant protective layer is provided on the outer wall of the pipe body. The first and second corrosion-resistant protective layers provide comprehensive corrosion protection for both the inner and outer walls of the pipe, thereby improving the corrosion resistance of the natural gas pipeline and extending its service life.

[0004] Existing technologies improve installation efficiency through assembly panels, but pipe connections are easily affected by external environmental factors, which may cause pipe materials to expand or contract. Deformation of pipe materials will aggravate the stress at the joint, leading to stress concentration at the joint. Long-term use may cause cracks or air leaks, which not only reduces the service life but also easily creates safety hazards.

[0005] To address the aforementioned issues, there is an urgent need for innovative designs based on existing underground natural gas pipelines. Therefore, we proposed that underground natural gas pipelines can effectively solve these problems. Utility Model Content

[0006] The purpose of this utility model is to provide an underground natural gas pipeline to solve the problems mentioned in the background art. Currently, the market has improved installation efficiency through assembly panels, but the pipeline connection is easily affected by external environmental factors, which may cause the pipeline material to expand or contract. Deformation of the pipeline material will aggravate the stress at the joint, leading to stress concentration at the joint. Long-term use may cause cracks or gas leaks, which not only reduces the service life, but also easily causes safety hazards.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an underground natural gas pipeline, comprising a pipeline body, a connecting assembly at the end of the pipeline body, the connecting assembly including a flange installed at the end of the pipeline body, a support assembly installed at the bottom of the pipeline body, the support assembly including a limiting seat installed at the bottom of the pipeline body, a ground nail installed under the limiting seat, and a protective assembly provided on the outside of the flange, the protective assembly including a protective cover installed on the outside of the flange.

[0008] Preferably, the pipe body includes a layered assembly, the layered assembly including an inner pipe inside the pipe body, the inner pipe having an inner anti-corrosion layer made of epoxy resin.

[0009] Preferably, an antifreeze layer is provided on the outside of the inner tube, the antifreeze layer is made of thermal insulation material, and an external anti-corrosion layer is installed on the outside of the antifreeze layer.

[0010] Preferably, a waterproof layer is provided on the outside of the outer anti-corrosion layer, and the waterproof layer is made of asphalt.

[0011] Preferably, the flange has a limiting groove, which is arranged in a ring, and the limiting groove is threaded with a first bolt structure inside.

[0012] Preferably, the limiting seat has an arc groove that is adapted to the pipe body, and a support pad is provided inside the arc groove.

[0013] Preferably, a limiting block is installed on the side end of the protective cover, and a second bolt structure is connected through the inside of the limiting block.

[0014] Preferably, a valve is installed on the protective cover, and a cathode protection block is installed on the outside of the limiting block.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows: In this underground natural gas pipeline, the limiting seat is driven deep into the underground soil through ground nails to prevent the pipeline from shifting due to loose support. The protective cover is installed on the outside of the flange, which not only reduces the stress affecting the pipeline connection and lowers safety hazards, but also directly isolates the external environment from contact with the flange and the first bolt structure, preventing oxidation and rust at the pipeline connection and extending the service life of the pipeline. The specific details are as follows: (1) The protective cover is installed on the outside of the flange, and the limiting block at its side end is connected by the second bolt structure, so that the protective cover forms a closed space. This not only reduces the problem of stress at the pipe connection and reduces safety hazards, but also directly isolates the external environment from the contact between the flange and the first bolt structure, thus extending the service life of the pipe body.

[0016] (2) The limiting seat is driven into the underground soil through ground nails to prevent the support from loosening and causing the pipeline to shift. The arc groove at the top of the limiting seat is adapted to the shape of the pipeline. The elastic support pad in the arc groove can buffer the vibration generated by natural gas transportation and reduce structural loss.

[0017] (3) The pipe ends are precisely connected by flanges. The planar structure ensures the alignment of the axis and avoids leakage caused by connection deviation. The ring-shaped limiting grooves are used to position the first bolt structure to prevent bolt offset. The bolt preload makes the flange face fit tightly. The sealing ring inside the flange further enhances the anti-leakage effect and reduces the risk of leakage and corrosion. (4) The gas inside the protective cover is adsorbed by the valve on the protective cover, which creates a negative pressure inside the protective cover, thereby making the protective cover stably connected to the outside of the pipeline body and improving the overall stability. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal layered assembly structure of the pipe body of this utility model; Figure 3 This is a schematic diagram of the pipe body connection structure of this utility model; Figure 4 This is a schematic diagram showing the disassembled structure of the flange and the first bolt of this utility model; Figure 5 This is a schematic diagram of the limiting seat structure of this utility model; Figure 6 This is a schematic diagram of the internal structure of the protective cover of this utility model; Figure 7 This is a schematic diagram of the protective cover structure of this utility model.

[0019] In the diagram: 1. Pipe body; 2. Inner pipe; 3. Inner anti-corrosion layer; 4. Antifreeze layer; 5. Outer anti-corrosion layer; 6. Waterproof layer; 7. Flange; 8. Limiting groove; 9. First bolt structure; 10. Limiting seat; 11. Ground nail; 12. Arc groove; 13. Support pad; 14. Protective cover; 15. Limiting block; 16. Second bolt structure; 17. Valve; 18. Cathodic protection block. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Example 1: In this example, the antifreeze layer 4 reduces the heat exchange between the natural gas inside the pipeline body 1 and the external environment, preventing condensation or freezing of the natural gas inside the pipeline body 1 due to excessively low temperatures, thus ensuring the continuity of natural gas transportation. Figure 1 and Figure 2 The technical solution shown includes a pipeline body 1, which includes a hierarchical assembly. The hierarchical assembly includes an inner pipe 2 inside the pipeline body 1. The inner pipe 2 has an inner anti-corrosion layer 3 made of epoxy resin. An antifreeze layer 4 made of thermal insulation material is installed on the outside of the inner pipe 2. An outer anti-corrosion layer 5 is installed on the outside of the antifreeze layer 4. A waterproof layer 6 made of asphalt is installed on the outside of the outer anti-corrosion layer 5. The inner anti-corrosion layer 3, made of epoxy resin, can prevent trace corrosive components in natural gas from directly contacting the metal material of the inner pipe 2, avoiding perforation and rust on the inner wall of the inner pipe 2 due to media corrosion. This ensures the stability of the internal structure of the pipeline body 1 during natural gas transportation and prevents impurities from entering the natural gas and affecting its quality. The antifreeze layer 4 on the outside of the inner pipe 2 is made of thermal insulation material, and aerogel insulation felt (TES) can be used as the thermal insulation material. Aerogel felt is a composite material composed of aerogel and glass fiber. The material has an extremely fine pore structure and a highly open network, exhibiting low thermal conductivity. It maintains stable insulation performance even in extremely low temperatures without adding extra weight to the pipeline body 1. It also prevents material cracking due to repeated temperature changes. In underground low-temperature environments, the antifreeze layer 4 reduces heat exchange between the natural gas inside the pipeline body 1 and the external environment, preventing condensation or freezing blockage of the natural gas inside the pipeline body 1 due to excessively low temperatures, thus ensuring the continuity of natural gas transportation. The outer anti-corrosion layer 5, covering the outside of the antifreeze layer 4, is made of a soil corrosion-resistant material, blocking corrosive substances in the underground soil and preventing structural damage to the outer wall of the pipeline body 1 due to soil corrosion, thereby extending the overall service life of the pipeline body 1. The waterproof layer 6 outside the outer anti-corrosion layer 5 is made of asphalt. Asphalt can effectively prevent groundwater from seeping into the interior of the pipeline body 1, preventing moisture from damaging the insulation performance of the antifreeze layer 4 and further enhancing the overall protective effect. At the same time, asphalt is relatively inexpensive, reducing the overall protection cost of the pipeline body 1. Example 2: In this example, the support pad 13 inside the arc groove 12 is made of elastic material, which can buffer the vibration generated by natural gas transportation during the operation of the pipeline body 1, and avoid wear caused by direct rigid contact between the pipeline body 1 and the limiting seat 10. Specifically, as shown below... Figure 1 and Figures 3-5As shown, a connecting assembly is provided at the end of the pipeline body 1. The connecting assembly includes a flange 7 installed at the end of the pipeline body 1. A limiting groove 8 is formed on the flange 7. The limiting groove 8 is formed in a ring. A first bolt structure 9 is threadedly connected inside the limiting groove 8. A support assembly is installed at the bottom of the pipeline body 1. The support assembly includes a limiting seat 10 installed at the bottom of the pipeline body 1. A ground nail 11 is installed under the limiting seat 10. An arc groove 12 is formed on the limiting seat 10. The arc groove 12 is adapted to the pipeline body 1. A support pad 13 is provided inside the arc groove 12. The connecting assembly at the end of the pipeline body 1 is responsible for splicing multiple sections of the pipeline body 1. Two sections of the pipeline body 1 are precisely connected through the flange 7 at the end. The planar structure of the flange 7 can ensure that the axis of the pipeline body 1 is aligned, avoiding natural gas leakage due to connection deviation. The ring-shaped limiting groove 8 on the flange 7 provides installation positioning for the first bolt structure 9. When the first bolt structure 9 is tightened, the limiting groove 8 can prevent the first bolt structure 9 from shifting, ensuring that the flange 7 face is tightly fitted. The pre-tightening force of the bolt structure 9 creates a sealing pressure between the flanges 7. The internal sealing ring of the flange 7 greatly increases the overall anti-leakage effect, blocking natural gas from leaking from the joint gap and reducing the corrosion risk of the flange 7 contact surface. The annular distribution design of the limiting groove 8 ensures that the first bolt structure 9 is evenly stressed, avoiding excessive local pressure on the flange 7 that could lead to deformation. The limiting seat 10 is driven into the ground through the bottom ground nail 11 to form a stable support foundation, preventing displacement of the pipeline body 1 due to loose support. The arc groove 12 at the top of the limiting seat 10 is adapted to the shape of the pipeline body 1, allowing the pipeline body 1 to be precisely engaged in the arc groove 12. The support pad 13 inside the arc groove 12 is made of elastic material. On the one hand, it can buffer the vibration of the pipeline body 1 caused by natural gas transportation during operation, avoiding direct rigid contact between the pipeline body 1 and the limiting seat 10 that could lead to wear. On the other hand, it can fill the small gaps between the pipeline body 1 and the arc groove 12, preventing damage to the outer wall of the pipeline body 1 due to friction and extending the service life of the overall structure.

[0022] Example 3: In this example, the gas inside the protective cover 14 is adsorbed by the valve 17 on the protective cover 14, creating a negative pressure inside the protective cover 14. This ensures a stable connection between the protective cover 14 and the outside of the pipe body 1, improving overall stability. Specifically, as follows... Figure 1 and Figure 6 and Figure 7As shown, a protective assembly is provided on the outside of flange 7. The protective assembly includes a protective cover 14 installed on the outside of flange 7. A limit block 15 is installed on the side end of the protective cover 14. A second bolt structure 16 is connected through the limit block 15. A valve 17 is installed on the protective cover 14. A cathodic protection block 18 is installed on the outside of the limit block 15. The protective cover 14 covers the outside of flange 7, and the limit block 15 on its side end is connected by the second bolt structure 16, so that the protective cover 14 forms a closed space. This not only reduces the problem of stress affecting the pipe joint and lowers the safety hazards, but also directly isolates the external environment from the flange 7 and the first bolt structure 9, preventing oxidation and rust at the pipe body 1 connection and extending the service life. The service life of the pipeline body 1 is extended by the valve 17 on the protective cover 14, which adsorbs the gas inside the protective cover 14, creating a negative pressure inside the protective cover 14. This ensures a stable connection between the protective cover 14 and the outside of the pipeline body 1, improving overall stability. The cathodic protection block 18 on the outside of the limiting block 15 is made of sacrificial anode material. The cathodic protection block 18 is small in size and easy to install. It can be directly attached to the limiting block 15 without affecting the overall structure of the pipeline. The cathodic protection block 18 will preferentially react with corrosive substances in the soil, protecting the metal parts of the pipeline body 1 from corrosion through electrochemical action. The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An underground natural gas pipeline, comprising a pipeline body (1), characterized in that, The pipe body (1) is provided with a connecting assembly at its end, the connecting assembly including a flange (7) installed at the end of the pipe body (1), the pipe body (1) is provided with a support assembly at its bottom, the support assembly including a limiting seat (10) installed at the bottom of the pipe body (1), a ground nail (11) installed under the limiting seat (10), and a protective assembly is provided on the outside of the flange (7), the protective assembly including a protective cover (14) installed on the outside of the flange (7). A limiting block (15) is installed on the side of the protective cover (14). A second bolt structure (16) is connected through the inside of the limiting block (15). A valve (17) is installed on the protective cover (14). A cathodic protection block (18) is installed on the outside of the limiting block (15).

2. An underground natural gas pipeline according to claim 1, characterized in that: The pipeline body (1) includes a set of hierarchical components, the hierarchical components include an inner pipe (2) inside the pipeline body (1), the inner pipe (2) is provided with an inner anti-corrosion layer (3), the inner anti-corrosion layer (3) is made of epoxy resin.

3. An underground natural gas pipeline according to claim 2, characterized in that: The inner tube (2) is provided with an antifreeze layer (4) on the outside. The antifreeze layer (4) is made of heat insulation material and an external anti-corrosion layer (5) is installed on the outside of the antifreeze layer (4).

4. An underground natural gas pipeline according to claim 3, characterized in that: The outer anti-corrosion layer (5) is provided with a waterproof layer (6) on the outside, and the waterproof layer (6) is made of asphalt.

5. An underground natural gas pipeline according to claim 1, characterized in that: The flange (7) has a limiting groove (8) which is arranged in a ring. The limiting groove (8) is threaded with a first bolt structure (9).

6. An underground natural gas pipeline according to claim 1, characterized in that: The limiting seat (10) is provided with an arc groove (12), which is adapted to the pipe body (1), and a support pad (13) is provided inside the arc groove (12).

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