Pipeline for natural gas transmission

Abstract

The utility model discloses a natural gas transmission pipeline which comprises a pair of telescopic pipelines, a wrapping pipeline shell and a bearing platform, a pair of coupling pipeline through holes are formed in the wrapping pipeline shell respectively, and the pair of telescopic pipelines are movably inserted into the wrapping pipeline shell through the pair of coupling pipeline through holes respectively. The wrapping pipeline shell is installed on the bearing platform, a rapid combination extension pipe body structure is installed on the bearing platform, and an auxiliary monitoring pressure alarm structure is installed on the wrapping pipeline shell; the utility model relates to the technical field of natural gas transmission, and the pipeline is ingenious in design, and adopts a rapid combination extension pipe body structure, so that a pair of telescopic pipelines can be rapidly fixed and closed after the length is adjusted, and the flexible adjustment of the whole length of the pipeline is easily realized.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas transmission, in particular to a pipeline for natural gas transmission. Background Art

[0002] Natural gas refers to all gases that exist naturally in nature, mainly including gases formed by various natural processes in the atmosphere, hydrosphere and lithosphere. From a narrow perspective, what people usually call natural gas refers to a mixture of hydrocarbons and non-hydrocarbon gases naturally stored in the strata, mainly existing in oilfield gas, gas field gas, coalbed methane, mud volcano gas and biogenic gas. These gases are mainly composed of hydrocarbons, such as methane, ethane, etc., and also contain a small amount of non-hydrocarbon gases. The natural gas transmission pipeline refers to the pipeline that transports natural gas (including associated gas produced by oil fields) from the mining site or processing plant to the urban gas distribution center or industrial enterprise users. It is also called a gas pipeline. This pipeline is the main way to transport natural gas in large quantities on land. The natural gas transmission pipeline is a continuous and closed transmission system. From transportation, storage to user use, natural gas is under pressure. In addition, due to the small specific gravity of the transported natural gas, the static pressure head is much smaller than that of liquid, and the line is almost not restricted by the longitudinal terrain. However, once an accident occurs in the pipeline, it is very harmful. The impact is wide, so the safety and reliability of the pipeline are of vital importance. In urban gas supply, power plants and industrial uses, natural gas transmission pipelines play a vital role. For example, it can meet the gas needs of residents, commercial buildings and factories, provide fuel for the generator sets of power plants, and provide a large amount of gas supply for industrial processes such as metallurgy, chemical industry, glass manufacturing, textiles, and pharmaceuticals. In order to ensure that the design, construction and operation of natural gas transmission pipelines are standardized and normalized, a series of standards and specifications have been formulated internationally. The optimization directions of these pipelines include material selection, structural design, connection methods, intelligent monitoring and control systems, and energy-saving and emission reduction technologies, in order to improve the safety, reliability and economy of the pipelines. The existing natural gas transmission pipelines are often designed with a fixed length of pipe body, and this design has certain limitations in practical applications.Since it is impossible to flexibly adjust according to specific usage requirements, the pipeline is stretched when dealing with different scenarios and changes, and its adaptability is relatively weak. In order to improve the practicality and flexibility of the natural gas transmission pipeline, it is urgent to optimize and improve it to adapt to various complex and changeable application environments and better meet user needs. For example, "Utility Model CN211502352U A natural gas transmission pipeline can be connected by multiple sets of pipeline body ends, and the disassembly pipe is inserted into the lower inner side of the pipeline body above it. At this time, the bottom end of the lower positioning ring on the upper pipeline body is in close contact with the top end of the upper positioning ring on the lower pipeline body. Any end connection can be laid down and placed in the closed chamber formed by the placement groove. At this time, the upper and lower detection blocks and the upper detection block are closed, and the rubber sealing layer is tightly attached to the pipeline body, so that the pipeline body blocks the four sets of delivery grooves while the connection is located inside the closed chamber. After the seal is completed, if there is an air leak at the connection, the resulting inflation will gradually increase the pressure inside the closed chamber, and the gas can contact the extrusion plate through the exhaust pipe. When the pressure in the closed chamber reaches a high value, the pressure of the gas in the closed chamber on the extrusion plate can cause the extrusion plate to compress the extrusion spring and move upward, and the gas is discharged through the exhaust pipe. After the discharge, the extrusion plate will retract to the lower limit circle to make the closed chamber airtight again. The two sets of sliding plates facilitate the extrusion plate to move only longitudinally, and the extrusion spring is not easy to twist and deform, which is convenient for detecting the air tightness of the connection. The whistle is convenient for exhausting and blowing when there is a leak, which is more convenient to be discovered. The length of the tube itself can be conveniently adjusted according to the needs of use, thereby enhancing its adaptability, and the bottom plate is convenient for improving the supporting effect. In view of the above problems, there may be technical means to solve them in the prior art, but this case intends to provide an alternative or replacement technical solution. Utility Model Content

[0003] To achieve the above objectives, the utility model is implemented through the following technical solutions: a natural gas transmission pipeline, comprising: a pair of telescopic pipes, a sheathed pipe shell and a bearing platform, the sheathed pipe shell is respectively provided with a pair of coupling pipe through holes, the pair of telescopic pipes are respectively movably inserted into the sheathed pipe shell through the pair of coupling pipe through holes, the sheathed pipe shell is installed on the bearing platform, a quick assembly extension pipe body structure is installed on the bearing platform, and an auxiliary monitoring pressure alarm structure is installed on the sheathed pipe shell;

[0004] The quick assembly extension tube structure comprises: a pair of tube bottom positioning push blocks, a shell connection key, a plurality of block upper pressure-increasing springs, a pair of covering sealing adhesive layers, a plurality of connection support blocks and a plurality of retention auxiliary components;

[0005] A pair of push block alignment grooves are respectively provided on the bearing platform, a pair of the tube bottom positioning push blocks are respectively connected to the bearing platform through a pair of the push block alignment grooves, the shell connection key is installed on the outer side wall of the sheathed pipe shell, and the shell connection key is connected to the bearing platform, a number of the block upper pressure boosting springs are respectively installed on a pair of the tube bottom positioning push blocks, and a number of the block upper pressure boosting springs are respectively connected to a pair of the sheathed sealing adhesive layers, a pair of the sheathed sealing adhesive layers are respectively connected to a pair of the outer side walls of the telescopic pipes, a number of the connection support blocks are respectively installed on the bearing platform, and a number of the retention auxiliary components are respectively installed on a number of the connection support blocks;

[0006] The retaining auxiliary component includes: a bearing bag frame, a push gas rod, a moving push block, a pair of upper slide grooves of the moving block, a pair of connecting slide columns, a forked connecting push rod, a pair of push rod retaining shafts and a connecting plug block;

[0007] The carrying package frame is installed on the carrying platform, the pushing gas rod is installed on the connecting support block, the moving pushing block is installed on the pushing gas rod, the moving pushing block is respectively provided with a pair of sliding grooves on the moving block, a pair of connecting sliding columns are respectively inserted into a pair of sliding grooves on the moving block, the forked connecting push rods are respectively connected to the pair of connecting sliding columns through a rotating shaft, a pair of push rod retaining rotating shafts are respectively installed on the carrying package frame, and a pair of push rod retaining rotating shafts are respectively connected to the forked connecting push rods, the connecting plug block is installed on the forked connecting push rod through a rotating shaft, a plurality of plug-in through holes are provided on the tube bottom clamping push block, the connecting plug block is inserted into the tube bottom clamping push block through the plug-in through holes, and a plurality of plug-in block grooves are provided on the shell connecting key, and the connecting plug block is connected to the shell connecting key through the plug-in block groove;

[0008] It should be noted that in the above, the supporting platform is fixed to the required installation position by a number of fixing nails arranged thereon, a pair of telescopic pipes are inserted into the coated pipe shell, and a pair of pipe bottom positioning push blocks are installed and connected to the supporting platform. At this time, the booster springs on the several blocks will push the coated sealed adhesive layer to tightly press the side wall below the telescopic pipe. At the same time, the coated sealed adhesive layer can tightly cover the gap between the telescopic pipe and the coated pipe shell, and a pair of coupling pipe through holes opened on the coated pipe shell are also provided with sealing rubber rings, which can make the sealing of the entire pipeline better. After the telescopic pipes are respectively connected to the inlet and outlet pipes, natural gas can be transported into the coated pipe shell for transporting natural gas, and an air pump is arranged on the supporting platform, which assists in synchronously pumping or blowing air to the four push gas rods through the pipeline, so that the four push gas rods on the four connecting support blocks are contracted or extended, so that the corresponding four moving push blocks are pushed or pulled, and then the corresponding pair of connecting sliding columns slide in the corresponding pair of moving blocks. The forked connecting rod is a component similar to a Y-rod, and the forked part is fixed to the bearing frame by a pair of push rod fixing shafts. Therefore, when the pair of connecting sliding columns slide and change position, the unforked position of the forked connecting rod is lifted or lowered, thereby driving the connecting plug block to be lifted or lowered. In summary, when the push rod is inflated or deflated for extension and retraction, the corresponding connecting plug block can be driven to be lifted or lowered, thereby inserting and locking the bottom positioning push block on the shell connection key, thereby completing the fixation of a pair of bottom positioning push blocks. Therefore, after adjusting the extension length of a pair of telescopic pipes, a pair of bottom positioning push blocks are installed and locked in the above manner, thereby ensuring the overall sealing of a pair of telescopic pipes and the sheathed pipe shell. The pipe connection joint arranged on the telescopic pipe can enable the telescopic pipe to be quickly connected with other standard natural gas pipelines, and the natural gas concentration detection sensor arranged in the sheathed pipe shell can assist in detecting the natural gas state in the pipeline.

[0009] Preferably, the auxiliary monitoring pressure alarm structure comprises: an early warning chamber, a placement top block, a core preset spring, a plurality of convex contact points, a plurality of concave coupling contacts, a pneumatic push plate, a pneumatic sliding key and a sliding groove in the chamber;

[0010] The early warning bin is mounted on the sheathed pipe shell, the placement top block is mounted in the early warning bin, the core preset spring is mounted on the placement top block, a plurality of the convex contact contacts are respectively mounted on the placement top block, a plurality of the concave coupling contacts are respectively mounted on the air pressure push plate, and a plurality of the concave coupling contacts are respectively directly opposite to the lower part of a plurality of the convex contact contacts, an inner slide groove is provided in the early warning bin, the air pressure slide key is mounted on the side wall of the air pressure push plate, and the air pressure slide key is mounted in the inner slide groove, the air pressure push plate is mounted in the early warning bin, and the early warning bin is connected to the sheathed pipe shell;

[0011] It should be noted that, in the above, when the natural gas pressure in the sheathing pipe shell is less than or equal to the preset core preset spring force, the pneumatic push plate will not be pushed; if it exceeds the preset elastic force, the pneumatic push plate will be pushed, and the pneumatic push plate slides in the slide groove in the bin by means of the pneumatic sliding key, and the pneumatic push plate is lifted upward and makes a number of recessed coupling contacts contact with a number of convex contact contacts on the placement top block; when the convex contact contacts contact with the recessed coupling contacts, the conduction of electrical signals is triggered, and then an alarm signal is sent to the control room, thereby helping workers to better warn of the pressure conditions in the pipeline; the vents arranged on the warning bin can prevent the pneumatic push plate from compressing the air upward when it rises, thereby affecting the accuracy of pressure detection by the warning bin.

[0012] Preferably, the telescopic pipe is provided with a pipe connection joint;

[0013] Preferably, a natural gas concentration detection sensor is provided in the sheathed pipeline shell;

[0014] Preferably, the bearing platform is provided with fixing nails;

[0015] Preferably, a vent hole is provided on the early warning chamber.

[0016] Beneficial Effects

[0017] The utility model provides a pipeline for natural gas transmission. It has the following beneficial effects. Compared with the prior art, the pipeline for natural gas transmission is cleverly designed and adopts a quick combination extension pipe body structure, so that a pair of telescopic pipes can be quickly fixed and closed after adjusting the length, so as to easily realize the flexible adjustment of the overall length of the pipeline; this innovative design not only enhances the adaptability of the pipeline, but also improves work efficiency. In addition, the detector is innovatively integrated on the pipeline, which not only enhances the safety of the pipeline node, but also gives the pipeline a higher level of intelligence. Through this optimization, our natural gas transmission pipeline not only ensures safety, but also demonstrates excellent intelligent management capabilities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the main cross-sectional structure of a natural gas transmission pipeline described in the utility model.

[0019] Figure 2 The utility model is a schematic diagram of the top view of the natural gas transmission pipeline.

[0020] Figure 3 for Figure 1 A partial enlarged schematic diagram of "A" in the figure.

[0021] Figure 4 for Figure 1 A partial enlarged schematic diagram of "B" in the figure.

[0022] In the figure: 1. telescopic pipe; 2. pipe shell; 3. load-bearing platform; 4. push block at the bottom of the pipe; 5. shell connection key; 6. booster spring on the block; 7. sealed adhesive layer; 8. connection support block; 9. load-bearing package frame; 10. push rod; 11. moving push block; 12. sliding groove on the moving block; 13. connection slide column; 14. forked connection push rod; 15. push rod fixing shaft; 16. connection plug block; 17. early warning bin; 18. placement of top block; 19. core preset spring; 20. convex contact point; 21. concave coupling contact; 22. pneumatic push plate; 23. pneumatic slide key; 24. sliding groove in the bin. DETAILED DESCRIPTION

[0023] Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present utility model.

[0024] Through the personnel in this field, all the electrical components in this case are connected to their corresponding power supplies through wires, and appropriate controllers and encoders should be selected according to actual conditions to meet the control requirements. The specific connection and control sequence should refer to the following working principle, and the electrical connection between the electrical components is completed in the order of working in sequence. The detailed connection means are well-known technologies in this field. The following mainly introduces the working principles and processes, and no longer explains the electrical control.

[0025] Example

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings. Figure 1-4As shown, a pipeline for natural gas transmission comprises: a pair of telescopic pipes 1, a sheathed pipe shell 2 and a bearing platform 3, wherein the sheathed pipe shell 2 is respectively provided with a pair of coupling pipe through holes, and the pair of telescopic pipes 1 are respectively movably inserted into the sheathed pipe shell 2 through the pair of coupling pipe through holes, the sheathed pipe shell 2 is installed on the bearing platform 3, a quick-assembly extension pipe body structure is installed on the bearing platform 3, and an auxiliary monitoring pressure alarm structure is installed on the sheathed pipe shell 2; the quick-assembly extension pipe body structure comprises: a pair of pipe bottom positioning push blocks 4, a shell connection key 5, a plurality of block-up pressure-boosting springs 6, a pair of sheathed sealing adhesive layers 7, a plurality of connection support blocks 8 and a plurality of retention auxiliary components; A pair of push block alignment grooves are respectively provided on the bearing platform 3, a pair of the tube bottom positioning push blocks 4 are respectively connected to the bearing platform 3 through a pair of the push block alignment grooves, the shell connection key 5 is installed on the outer side wall of the sheathed pipe shell 2, and the shell connection key 5 is connected to the bearing platform 3, a number of the block-upper pressure springs 6 are respectively installed on a pair of the tube bottom positioning push blocks 4, and a number of the block-upper pressure springs 6 are respectively connected to a pair of the sheathed sealing rubber layers 7, a pair of the sheathed sealing rubber layers 7 are respectively connected to a pair of the outer side walls of the telescopic pipe 1, a number of the connection support blocks 8 are respectively installed on the bearing platform 3, and a number of the retention auxiliary components are respectively installed on a number of the connection support blocks 8 On; the retention auxiliary component includes: a bearing package frame 9, a pushing gas rod 10, a mobile push block 11, a pair of upper slide grooves 12 on the moving block, a pair of connecting slide columns 13, a forked connecting push rod 14, a pair of push rod fixing shafts 15 and a connecting plug block 16; the bearing package frame 9 is installed on the bearing platform 3, the pushing gas rod 10 is installed on the connecting support block 8, the mobile push block 11 is installed on the pushing gas rod 10, and a pair of upper slide grooves 12 on the moving block are respectively opened on the mobile push block 11, a pair of connecting slide columns 13 are respectively inserted in a pair of upper slide grooves 12 on the moving block, the forked connecting push rod 14 is respectively connected to a pair of connecting slide columns 13 through a rotating shaft, and a pair of push rod fixing shafts 15 are respectively installed on the bearing The package carrier frame 9 is provided with a pair of push rod fixing shafts 15 respectively connected with the forked connecting push rods 14, the connecting plug block 16 is installed on the forked connecting push rod 14 through the shaft, the tube bottom clamping push block 4 is provided with a plurality of insertion through holes, the connecting plug block 16 is inserted into the tube bottom clamping push block 4 through the insertion through holes, the shell connecting key 5 is provided with a plurality of plug block grooves, the connecting plug block 16 is connected with the shell connecting key 5 through the plug block grooves; the auxiliary monitoring pressure alarm structure includes: an early warning bin 17, a placement top block 18, a core preset spring 19, a plurality of convex contact contacts 20, a plurality of concave coupling contacts 21, a pneumatic push plate 22, a pneumatic slide key 23 and a bin inner slide groove 24;The early warning bin 17 is mounted on the sheathed pipe housing 2, the placement top block 18 is mounted in the early warning bin 17, the core preset spring 19 is mounted on the placement top block 18, a plurality of convex contact contacts 20 are respectively mounted on the placement top block 18, a plurality of concave coupling contacts 21 are respectively mounted on the gas pressure push plate 22, and a plurality of concave coupling contacts 21 are respectively directly below a plurality of convex contact contacts 20, the early warning bin 17 is provided with the inner bin slide 24, the gas pressure slide key 23 is mounted on the side wall of the gas pressure push plate 22, and the gas pressure slide key 23 is mounted in the inner bin slide 24, the gas pressure push plate 22 is mounted in the early warning bin 17, and the early warning bin 17 is connected to the sheathed pipe housing 2. ;

[0027] According to the attached Figure 1-4It is concluded that the bearing platform 3 is fixed at the position where it needs to be installed through several fixing nails arranged thereon, a pair of telescopic pipes 1 are inserted into the coated pipe shell 2, and a pair of pipe bottom positioning push blocks 4 are installed and connected with the bearing platform 3. At this time, the booster springs 6 on the several blocks will push the coated sealed adhesive layer 7 to tightly press the side wall below the telescopic pipe 1. At the same time, the coated sealed adhesive layer 7 can tightly cover the gap between the telescopic pipe 1 and the coated pipe shell 2, and a pair of coupling pipe through holes opened on the coated pipe shell 2 are also provided with sealing rubber rings, which can make the sealing of the entire pipeline better. After the telescopic pipe 1 is connected to the inlet and outlet pipes respectively, natural gas can be transported into the coated pipe shell 2 for transporting natural gas, and the bearing platform 3 An air pump is provided, and the air pump assists in synchronously pumping or blowing air to the four push rods 10 through the pipeline, so that the four push rods 10 on the four connection support blocks 8 are contracted or extended, so that the corresponding four moving push blocks 11 are pushed or pulled, and then the corresponding pair of connection slide columns 13 slide in the corresponding pair of sliding grooves 12 on the moving blocks, so that the forked connection push rod 14 that rotates by relying on a pair of push rod retaining shafts 15 on the bearing package frame 9 rotates and changes position. The forked connection push rod 14 is a component similar to a Y-shaped rod, and the forked part is fixed to the bearing package frame 9 by a pair of push rod retaining shafts 15. Therefore, when the pair of connection slide columns 13 slide and change position, the unforked position of the forked connection push rod 14 is lifted or lowered, thereby driving the connection plug block 16 Lifting or lowering, in summary, when the push rod 10 is inflated or deflated for extension and retraction, the corresponding connecting plug block 16 can be driven to lift or lower, so that the tube bottom clamping push block 4 is inserted and locked on the shell connecting key 5, thereby completing the fixation of a pair of tube bottom clamping push blocks 4. Therefore, after adjusting the telescopic length of a pair of telescopic pipes 1, the pair of tube bottom clamping push blocks 4 are installed and locked in the above manner, thereby ensuring the overall sealing of a pair of telescopic pipes 1 and the sheathed pipe shell 2. The pipe connection joint arranged on the telescopic pipe 1 can enable the telescopic pipe 1 to be quickly connected to other standard natural gas pipelines. The natural gas concentration detection sensor arranged in the sheathed pipe shell 2 can assist in detecting the natural gas state in the pipeline; when the natural gas in the sheathed pipe shell 2 When the air pressure is less than or equal to the preset elastic force of the core preset spring 19, the air pressure push plate 22 will not be pushed. If it exceeds the preset elastic force, the air pressure push plate 22 will be pushed. The air pressure push plate 22 slides in the slide groove 24 in the bin by relying on the air pressure sliding key 23. The air pressure push plate 22 is lifted upward and makes several recessed coupling contacts 21 contact several convex contact contacts 20 on the top block 18. When the convex contact contacts 20 contact the recessed coupling contacts with each other, the conduction of electrical signals will be triggered, and then an alarm signal will be sent to the control room, thereby helping workers to better warn of the pressure conditions in the pipeline. The vents set on the warning bin 17 can prevent the air from being compressed upward when the air pressure push plate 22 rises, thereby affecting the accuracy of pressure detection by the warning bin 17.

[0028] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pipeline for natural gas transmission, comprising: A pair of telescopic pipes (1), a sheathed pipe shell (2) and a bearing platform (3), characterized in that a pair of coupling pipe through holes are respectively opened on the sheathed pipe shell (2), the pair of telescopic pipes (1) are respectively movably inserted into the sheathed pipe shell (2) through the pair of coupling pipe through holes, the sheathed pipe shell (2) is installed on the bearing platform (3), a quick-assembly extension pipe body structure is installed on the bearing platform (3), and an auxiliary monitoring pressure alarm structure is installed on the sheathed pipe shell (2); The quick assembly extension tube structure comprises: a pair of tube bottom locking push blocks (4), a shell connection key (5), a plurality of block upper pressure-increasing springs (6), a pair of covering sealing adhesive layers (7), a plurality of connection support blocks (8) and a plurality of retaining auxiliary components; A pair of push block alignment grooves are respectively provided on the bearing platform (3), a pair of the tube bottom positioning push blocks (4) are respectively connected to the bearing platform (3) through a pair of the push block alignment grooves, the shell connection key (5) is installed on the outer side wall of the sheathed pipe shell (2), and the shell connection key (5) is connected to the bearing platform (3), a plurality of the block-on booster springs (6) are respectively installed on the pair of the tube bottom positioning push blocks (4), and a plurality of the block-on booster springs (6) are respectively connected to a pair of the sheathed sealing adhesive layers (7), a pair of the sheathed sealing adhesive layers (7) are respectively connected to a pair of the outer side walls of the telescopic pipes (1), a plurality of the connection support blocks (8) are respectively installed on the bearing platform (3), and a plurality of the retaining auxiliary components are respectively installed on a plurality of the connection support blocks (8); The retaining auxiliary component comprises: a bearing frame (9), a push gas rod (10), a movable push block (11), a pair of upper slide grooves of the movable block (12), a pair of connecting slide columns (13), a forked connecting push rod (14), a pair of push rod retaining shafts (15) and a connecting plug block (16); The bearing package frame (9) is installed on the bearing platform (3), the pushing gas rod (10) is installed on the connecting support block (8), the moving push block (11) is installed on the pushing gas rod (10), and the moving push block (11) is respectively provided with a pair of sliding grooves (12) on the moving block, and a pair of connecting slide columns (13) are respectively inserted in a pair of sliding grooves (12) on the moving block, and the forked connecting push rod (14) is respectively connected to the pair of connecting slide columns (13) through a rotating shaft, and a pair of push rod fixing rotating shafts (15) are respectively installed On the supporting package frame (9), a pair of push rod fixing shafts (15) are respectively connected to the forked connecting push rods (14), and the connecting plug block (16) is installed on the forked connecting push rod (14) through the shaft. The tube bottom positioning push block (4) is provided with a plurality of insertion through holes, and the connecting plug block (16) is inserted into the tube bottom positioning push block (4) through the insertion through holes. The shell connecting key (5) is provided with a plurality of plug block grooves, and the connecting plug block (16) is connected to the shell connecting key (5) through the plug block grooves.

2. A natural gas transmission pipeline according to claim 1, characterized in that: The auxiliary monitoring pressure alarm structure comprises: an early warning chamber (17), a placement top block (18), a core preset spring (19), a plurality of convex contact points (20), a plurality of concave coupling contacts (21), a pneumatic push plate (22), a pneumatic sliding key (23) and a sliding groove (24) in the chamber; The early warning bin (17) is mounted on the sheathed pipe shell (2), the placement top block (18) is mounted in the early warning bin (17), the core preset spring (19) is mounted on the placement top block (18), a plurality of convex contact points (20) are respectively mounted on the placement top blocks (18), a plurality of concave coupling contacts (21) are respectively mounted on the pneumatic push plate (22), and a plurality of concave coupling contacts (21) are respectively directly opposite to the lower part of a plurality of convex contact points (20), an in-bin slide groove (24) is provided in the early warning bin (17), the pneumatic slide key (23) is mounted on the side wall of the pneumatic push plate (22), and the pneumatic slide key (23) is mounted in the in-bin slide groove (24), the pneumatic push plate (22) is mounted in the early warning bin (17), and the early warning bin (17) is connected to the sheathed pipe shell (2).

3. A natural gas transmission pipeline according to claim 2, characterized in that: The telescopic pipe (1) is provided with a pipe connecting joint.

4. A natural gas transmission pipeline according to claim 3, characterized in that: A natural gas concentration detection sensor is arranged in the sheathed pipeline shell (2).

5. A natural gas transmission pipeline according to claim 4, characterized in that: The bearing platform (3) is provided with fixing ground nails.

6. A natural gas transmission pipeline according to claim 5, characterized in that: The early warning chamber (17) is provided with a vent hole.

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