Collecting and flow guiding system for fuel gas leakage

Abstract

The utility model discloses a collection and flow guide system for gas leakage. The collection and flow guide system comprises a gas pipeline and a collection and flow guide device, the collecting and guiding device comprises a collecting mechanism and a guiding mechanism; the collecting mechanism comprises a gas collecting header pipe, a plurality of branch gas collecting hoods and gas collecting branch pipes arranged between the branch gas collecting hoods and the gas collecting header pipe; the flow guide mechanism comprises a flow guide header pipe and a tail end gas collecting hood; the branch gas collecting hoods are located above the gas pipeline, and the multiple branch gas collecting hoods are arranged in the axis direction of the gas pipeline; the tail end gas collecting hood is located in a safe area; one end of the gas collection branch pipe is communicated with the branch gas collection hood, and the other end is communicated with the gas collection main pipe; one end of the diversion header pipe is communicated with the gas collection header pipe, and the other end is communicated with the tail end gas collection hood. According to the system, leaked gas can be guided to a safety area, whether the gas pipeline located below the motor vehicle lane leaks or not can be monitored in the safety area, inspection is convenient, and the personal safety of inspection personnel cannot be threatened.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas pipeline monitoring technical field, concretely relates to a collection and flow guide system of gas leakage. BACKGROUND

[0002] Gas pipe networks are distributed throughout the city, and with the passage of time, some gas pipe networks will show signs of aging or damage to the self-corrosion layer of the gas pipe network, and the gas pipe network that has problems needs to be updated and modified. For municipal gas pipeline reconstruction, according to the different scale of reconstruction, it is mainly divided into two categories of pipeline local reconstruction and pipeline overall reconstruction. On this basis, according to the specific way of reconstruction, the pipeline local reconstruction can be further divided into three ways of local excavation pipe replacement, corrosion layer repair and installation of cathodic protection, and the pipeline overall reconstruction is divided into two ways of non-excavation repair and overall pipe replacement.

[0003] Overall pipe replacement is the replacement of the overall gas pipeline of a road section. With the rapid development of urbanization construction, various types of municipal pipelines have been laid under the non-motor vehicle lane and the sidewalk, and the non-motor vehicle lane and the sidewalk are full of various pipelines and facilities. Since various types of municipal pipelines have been laid under the non-motor vehicle lane and the sidewalk, the current overall pipe replacement method can only lay new pipelines under the motor vehicle lane. In order to ensure the normal transportation of gas in the gas pipeline, it is necessary to patrol and maintain the gas pipeline and monitor whether the gas pipeline leaks. The existing patrol method is to patrol along the line. However, the gas pipeline is located under the motor vehicle lane, which will cause the following problems:

[0004] Since the gas pipeline is located under the motor vehicle lane, it is not easy to patrol and maintain, and if the previous line patrol method is still adopted, it will pose a threat to the personal safety of the patrol personnel, making it difficult to patrol. CONTENT OF THE UTILITY MODEL

[0005] The utility model aims at overcoming the above-mentioned problems and providing a collection and flow guide system of gas leakage, which can guide the leaked gas to a safe area, monitor whether the gas pipeline under the motor vehicle lane leaks in the safe area, facilitate the patrol, and not pose a threat to the personal safety of the patrol personnel.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] A collection and flow guide system of gas leakage, comprising a gas pipeline and a collection and flow guide device; the collection and flow guide device comprises a collection mechanism and a flow guide mechanism; the collection mechanism comprises a gas collection header, a plurality of branch gas collection hoods, and a gas collection branch pipe arranged between each branch gas collection hood and the gas collection header; the flow guide mechanism comprises a flow guide header and a terminal gas collection hood; wherein,

[0008] The branch gas collecting cover is located above the gas pipeline and is used for collecting leaked gas; a plurality of branch gas collecting covers are arranged along the axial direction of the gas pipeline; the terminal gas collecting cover is located in a safety area; one end of the gas collecting branch pipe is communicated with the branch gas collecting cover, and the other end is communicated with the gas collecting main pipe; one end of the flow guide main pipe is communicated with the gas collecting main pipe, and the other end is communicated with the terminal gas collecting cover.

[0009] The working principle of the gas leakage collecting and guiding system is as follows:

[0010] The gas pipeline is arranged below a motor vehicle lane; when gas in the gas pipeline leaks, the leaked gas is collected by the branch gas collecting cover, enters the gas collecting branch pipe, is then gathered by the gas collecting main pipe, and then enters the flow guide main pipe, and is guided to the safety area through the terminal gas collecting cover; through the collecting mechanism and the flow guiding mechanism, the leaked gas is collected and guided to the safety area, and whether the gas exists in the safety area can be monitored in real time, and the inspection personnel can inspect in the safety area, so that whether the gas pipeline below the motor vehicle lane leaks can be monitored, and the inspection is convenient and does not threaten the personal safety of the inspection personnel.

[0011] In an optimal scheme of the utility model, a plurality of straight pipe section welds are arranged on the gas pipeline, and the branch gas collecting cover is arranged in one-to-one correspondence with the straight pipe section weld. Through the above structure, since the straight pipe section weld is prone to gas leakage, the branch gas collecting cover is arranged in one-to-one correspondence with the straight pipe section weld, so that the leaked gas can be well collected.

[0012] Preferably, the gas pipeline is provided with a straight pipe section weld and a tee pipe; a plurality of branch gas collecting covers are arranged in one-to-one correspondence with the straight pipe section weld and the tee pipe. In the above structure, since the straight pipe section weld and the tee weld of the tee pipe are prone to gas leakage, the plurality of branch gas collecting covers are arranged in one-to-one correspondence with the straight pipe section weld and the tee pipe, so that the leaked gas can be well collected; the tee welds of the tee pipe are close to each other, one branch gas collecting cover is arranged corresponding to one tee pipe, so that the structure becomes more compact and the cost is saved.

[0013] Preferably, the gas collecting main pipe and the gas pipeline are parallel to each other. The purpose is to facilitate the arrangement of the gas collecting branch pipe and the branch gas collecting cover, so that the structure becomes very compact.

[0014] Preferably, the flow guide main pipe comprises an inclined section and a vertical section; the inclined section is arranged upwardly and inclined towards the direction away from the gas collecting main pipe; one end of the inclined section is communicated with the gas collecting main pipe, and the other end is communicated with the lower end of the vertical section; the upper end of the vertical section is communicated with the terminal gas collecting cover. By being arranged upwardly and inclined, the leaked gas is guided and transported conveniently, and the leaked gas is guided to the safe area.

[0015] Preferably, the terminal gas collecting cover is arranged in a valve well, and the valve well is located in the safe area; the bottom of the valve well is provided with backfilling medium sand, and the terminal gas collecting cover is arranged in the space above the backfilling medium sand; the inclined section of the flow guide main pipe is connected with the vertical section after entering the backfilling medium sand from the lower end of the valve well, and the vertical section is connected with the terminal gas collecting cover after penetrating out of the backfilling medium sand upwardly. Arranging the terminal gas collecting cover in the valve well can guide the leaked gas into the valve well for monitoring, thereby improving the safety of inspection; the backfilling medium sand has a certain fixing effect on the flow guide main pipe.

[0016] Further, the valve well is an old valve well, i.e., the valve well is the valve well of the original old PE gas pipeline, and the space above the backfilling medium sand is provided with a diffusion valve; the diffusion valve is connected with the original old PE gas pipeline. In the above structure, the terminal gas collecting cover is arranged on the old valve well, and it is not necessary to newly excavate a valve well, but directly use the original old valve well, thereby realizing gas monitoring by using the existing resources and saving the cost.

[0017] Preferably, the terminal gas collecting cover is arranged in a leak detection well, and the leak detection well is located in the safe area; the bottom of the leak detection well is provided with backfilling medium sand, and the terminal gas collecting cover is arranged in the space above the backfilling medium sand; the inclined section of the flow guide main pipe is connected with the vertical section after entering the backfilling medium sand from the lower end of the valve well, and the vertical section is connected with the terminal gas collecting cover after penetrating out of the backfilling medium sand upwardly. Arranging the terminal gas collecting cover in the leak detection well can guide the leaked gas into the leak detection well for monitoring, thereby improving the safety of inspection; the backfilling medium sand has a certain fixing effect on the flow guide main pipe.

[0018] Further, the leak detection well is an independent leak detection well, which is convenient for inspection personnel to inspect as a leak detection point.

[0019] Preferably, the gas pipeline is arranged below a roadbed, and the roadbed is provided with a medium sand layer filled with medium sand; the gas pipeline penetrates through the medium sand layer; and the collecting mechanism is located in the medium sand layer. By arranging the medium sand layer, the medium sand layer has air permeability, and when gas leakage occurs, the branch gas collecting covers of the collecting mechanism can collect the leaked gas.

[0020] Preferably, the upper end of the middle sand layer is provided with a protective cover plate; the roadbed and the protective cover plate are filled with soil.

[0021] Preferably, the two ends of the gas collecting main are provided with gas collecting main blind plates, which serve to seal the two ends of the gas collecting main.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] The collecting and guiding system in the utility model, through the collecting mechanism and the guiding mechanism, realizes the collection and guidance of the leaked gas, guides the leaked gas to a safe area, that is, guides the escaped gas to a position convenient for safe maintenance; whether the gas exists in the safe area can be monitored in real time, the inspection personnel inspects in the safe area, thereby monitoring whether the gas pipeline under the motor vehicle lane leaks, and the inspection is convenient and does not threaten the personal safety of the inspection personnel. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a plane schematic view of the first specific implementation mode of the collecting and guiding system for gas leakage in the utility model.

[0025] Figure 2 It is a plane schematic view of the first specific implementation mode of the collecting and guiding system for gas leakage in the utility model. Figure 1 It is a sectional view along the direction of A-A.

[0026] Figure 3 It is a sectional view along the direction of A-A. Figure 1 It is a sectional view along the direction of B-B.

[0027] Figure 4 It is a plane schematic view of the second specific implementation mode of the collecting and guiding system in the utility model.

[0028] Figure 5 It is a sectional view of the third specific implementation mode of the collecting and guiding system in the utility model. DETAILED DESCRIPTION

[0029] In order to enable the skilled in the art to understand the technical scheme of the utility model well, the utility model is further described below in combination with the embodiments and the drawings, but the implementation mode of the utility model is not limited to this.

[0030] Embodiment 1

[0031] Referring to Figures 1-3The embodiment discloses a gas leakage collecting and guiding system, which comprises a gas pipeline 1 and a collecting and guiding device; the collecting and guiding device comprises a collecting mechanism and a guiding mechanism; the collecting mechanism comprises a gas collecting main pipe 7, a plurality of branch gas collecting covers 4 and a gas collecting branch pipe 5 arranged between each branch gas collecting cover 4 and the gas collecting main pipe 7; the guiding mechanism comprises a guiding main pipe 8 and a terminal gas collecting cover 9; wherein the branch gas collecting cover 4 is located above the gas pipeline 1 and used for collecting leaked gas; the plurality of branch gas collecting covers 4 are arranged along the axial direction of the gas pipeline 1; the terminal gas collecting cover 9 is located in a safety area; one end of the gas collecting branch pipe 5 is in communication with the branch gas collecting cover 4, and the other end is in communication with the gas collecting main pipe 7; one end of the guiding main pipe 8 is in communication with the gas collecting main pipe 7, and the other end is in communication with the terminal gas collecting cover 9.

[0032] Referring to Figures 1-3 One end of the guiding main pipe 8 is in communication with the middle part of the gas collecting main pipe 7, which is arranged at the middle position and is more convenient for guiding the gas in the gas collecting main pipe 7 into the guiding main pipe 8 and gathering the gas in the middle position.

[0033] Referring to Figures 1-3 The gas pipeline 1 is arranged below a roadbed, the gas pipeline 1 is a newly-built gas pipeline, a unified thick-wall PE gas pipeline is adopted, the number of welding openings is reduced as much as possible, and the safety of the gas pipeline 1 itself is improved; the collecting and guiding system of the embodiment is arranged at each welding opening and a three-way pipe fitting 24 connecting position; the safety area is a position convenient for safe maintenance, and the leaked gas is guided to the position convenient for safe maintenance through the collecting mechanism and the guiding mechanism.

[0034] Referring to Figures 1-3 In order to ensure the construction and installation quality, the gas pipeline 1 and the collecting and guiding device of the embodiment are kept in a "three simultaneous" state, namely, simultaneous design, simultaneous construction and simultaneous production and use; since the newly-built gas pipeline is arranged below the roadbed, the minimum covering thickness (the road surface of the roadbed to the top of the gas pipeline 1) of the buried gas pipeline 1 is not less than 0.9 m.

[0035] Referring to Figures 1-3The branch gas collecting cover 4 is located at a position about 0.3 m above the gas pipeline 1, and the gas pipeline 1 is provided with a straight pipe joint 2 and a tee pipe 24; the gas pipeline 1 is divided into a plurality of straight pipe sections, the straight pipe sections are connected through the straight pipe joints 2, and part of the straight pipe sections are connected through the tee pipes 24; the tee pipes 24 and the straight pipe sections are welded to form tee joints 3; and the plurality of branch gas collecting covers 4 are correspondingly arranged with the straight pipe joints 2 and the tee pipes 24. In the above structure, the straight pipe joints 2 and the tee joints 3 on the tee pipes 24 are prone to gas leakage, and the plurality of branch gas collecting covers 4 correspondingly arranged with the straight pipe joints 2 and the tee pipes 24 can well collect the leaked gas; the tee joints 3 on the tee pipes 24 are close to each other, one tee pipe 24 corresponds to one branch gas collecting cover 4, and the structure can be more compact and cost-saving.

[0036] Referring to Figures 1-3 , the number of the collecting and guiding devices can be multiple, one collecting and guiding device corresponds to one leakage detection point, the collecting and guiding main pipe 8 is led to the end leakage detection point according to the actual situation of the site, and the end gas collecting cover 9 is arranged at the end leakage detection point, which aims to facilitate inspection and accurately investigate the leaked gas pipeline 1. The number of the branch gas collecting covers 4 in the embodiment is three, two of which are correspondingly arranged with two straight pipe joints 2, and the remaining one is correspondingly arranged with one tee pipe 24.

[0037] Referring to Figures 1-3 , the roadbed includes a motor vehicle lane 10 and a non-motor vehicle lane 15; the motor vehicle lane 10 and the non-motor vehicle lane 15 are provided with road edge stones 11; the gas pipeline 1 is arranged below the motor vehicle lane 10; and the safety area is a side area 16 of the roadbed, which can be below a pedestrian crossing.

[0038] Referring to Figures 1-3 , the gas collecting main pipe 7 and the gas pipeline 1 are parallel to each other. Its purpose is to facilitate the layout of the gas collecting branch pipe 5 and the branch gas collecting cover 4, so that the structure becomes very compact.

[0039] Referring to Figures 1-3 , the collecting and guiding main pipe 8 includes an inclined section and a vertical section; the inclined section is arranged upwardly and inclined away from the gas collecting main pipe 7; one end of the inclined section is in communication with the gas collecting main pipe 7, and the other end is in communication with the lower end of the vertical section; and the upper end of the vertical section is in communication with the end gas collecting cover 9. By being arranged upwardly and inclined, the leaked gas can be guided, transported and guided to the safety area.

[0040] Referring to Figures 1-3 , the slope of the inclined section is 0.2%.

[0041] Referring to Figures 1-3 , the end gas collecting hood 9 of the embodiment is shared with the valve well 17, the end gas collecting hood 9 is arranged in the valve well 17, and the valve well 17 is located in a safety area; the bottom of the valve well 17 is provided with backfilling medium sand 21, and the end gas collecting hood 9 is arranged in the space above the backfilling medium sand 21; the inclined section of the flow guide main pipe 8 is connected with the vertical section after entering the backfilling medium sand 21 from the lower end of the valve well 17, and the vertical section is connected with the end gas collecting hood 9 after penetrating out of the backfilling medium sand 21 upwards. Arranging the end gas collecting hood 9 in the valve well 17 can guide the leaked gas into the valve well 17 for monitoring, improving the safety of inspection; the backfilling medium sand 21 plays a certain fixing role on the flow guide main pipe 8.

[0042] Referring to Figures 1-3 , the valve well 17 is an old valve well, that is, the valve well 17 is the valve well 17 of the original old PE gas pipeline 19, and the valve well 17 is originally arranged in the area 16 beside the roadbed; the space above the backfilling medium sand 21 is provided with a diffusion valve 20; the diffusion valve 20 is connected with the original old PE gas pipeline 19. In the above structure, the end gas collecting hood 9 is arranged on the old valve well, without the need of newly excavating the valve well 17, directly using the original old valve well, utilizing the existing resources, realizing gas monitoring, and saving the cost.

[0043] Referring to Figures 1-3 , the top elevation of the end gas collecting hood 9 should be lower than the valve port elevation of the diffusion valve 20.

[0044] Referring to Figures 1-3 , the valve well 17 is provided with a wall 18 around, the inclined section penetrates through the wall 18 to enter the backfilling medium sand 21, a sleeve pipe 22 is arranged at the wall-penetrating position corresponding to the inclined section and the wall 18, and the sleeve pipe 22 is sleeved outside the inclined section to protect the flow guide main pipe 8.

[0045] Referring to Figures 1-3 , the roadbed is provided below with a medium sand layer 12 backfilled with medium sand; the gas pipeline 1 penetrates through the medium sand layer 12; and the collecting mechanism is located in the medium sand layer 12. By arranging the medium sand layer 12, the medium sand layer 12 has air permeability, and when gas leakage occurs, the branch gas collecting hoods 4 of the collecting mechanism can collect the leaked gas.

[0046] Referring to Figures 1-3The upper end of the middle sand layer 12 is provided with a protective cover plate 13; and the roadbed and the protective cover plate 13 are filled with soil 14. After the gas pipeline 1 is installed, the middle sand 21 is backfilled in the middle sand layer 12, so that the collecting mechanism is filled with the middle sand; the gas pipeline 1 corresponding to the collecting mechanism is also filled with the middle sand; the upper end of the middle sand layer 12 is prevented by the protective cover plate 13; the roadbed and the protective cover plate 13 are tamped and filled with soil to form the soil layer 14; and the surrounding outer part of the middle sand layer 12 is also tamped and filled with soil.

[0047] Referring to Figures 1-3 The protective cover plate 13 is a PE protective cover plate.

[0048] Referring to Figures 1-3 After the gas pipeline 1 is installed, the middle sand should be backfilled and covered in time. After the middle sand is backfilled to 0.05 m of the top of the gas pipeline 1, the gas pipeline 1 center should be lightly knocked and compacted from both ends of the trench.

[0049] Referring to Figures 1-3 The both ends of the gas collecting main pipe 7 are provided with a gas collecting main pipe blind plate 6, which plays a sealing role on the both ends of the gas collecting main pipe 7.

[0050] Referring to Figures 1-3 The branch gas collecting cover 4, the gas collecting branch pipe 5, the gas collecting main pipe 7, the flow guide main pipe 8 and the terminal gas collecting cover 9 in the embodiment are all made of PVC-U material. The PVC-U is made of polyvinyl chloride as the main raw material, and then is extruded after adding a stabilizer, and is produced through the processes of cooling and solidification. The PVC-U has the advantages of light weight, strong corrosion resistance, good pressure resistance, small fluid resistance and low price. Considering that the leakage amount (not the third party damage) of the welding opening of the gas pipeline 1 is usually small, the pipe diameter of the gas collecting branch pipe 5 is uniformly selected as φ25 mm, and the pipe diameters of the gas collecting main pipe 7 and the flow guide main pipe 8 are uniformly selected as φ50 mm. The interfaces between the branch gas collecting cover 4, the gas collecting branch pipe 5, the gas collecting main pipe 7, the flow guide main pipe 8 and the terminal gas collecting cover 9 are all bonded by glue.

[0051] Referring to Figures 1-3 The buried depth of the gas pipeline 1 should be determined according to the factors such as the freezing depth, external load and other pipeline crossing. In the embodiment, the buried depth can be 0.20 m below the freezing line, and should meet the following conditions: when φ≤50 mm, the minimum buried depth of the top of the gas pipeline 1 is 0.50 m.

[0052] The gas pipeline 1 is laid on the undisturbed original soil foundation. When the foundation is rock or gravel, a fine soil or sand cushion layer should be laid on the foundation, and the thickness should be 0.15-0.20 m. In order to prevent uneven settlement of the collecting and flow guiding device, the backfilling soil is compacted in layers.

[0053] Referring to Figures 1-3The working principle of the above-mentioned gas leak collection and diversion system is as follows:

[0054] The gas pipeline 1 is located below the motor vehicle lane 10. When gas leaks in the gas pipeline 1, the leaked gas is collected by the branch gas collection hood 4, enters the gas collection branch pipe 5, and then converges through the gas collection main pipe 7. It then enters the guide main pipe 8 and exits from the end gas collection hood 9, guiding it to a safe area. Through the collection mechanism and the guide mechanism, the leaked gas is collected and guided to a safe area. In the safe area, the presence of gas can be monitored in real time. Inspection personnel can inspect the safe area to monitor whether the gas pipeline 1 located below the motor vehicle lane 10 has leaked. The inspection is convenient and will not threaten the personal safety of the inspection personnel.

[0055] Example 2

[0056] See Figures 1-3 The other structures in this embodiment are the same as in embodiment 1, except that the gas pipeline 1 is provided with multiple straight pipe section welds 2, and the branch gas collecting hood 4 is set one-to-one with the straight pipe section welds 2. By setting the above structure, since gas leakage is prone to occur at the straight pipe section welds 2, setting the branch gas collecting hood 4 one-to-one with the straight pipe section welds 2 can effectively collect the leaked gas.

[0057] See Figures 1-3 The number of straight pipe section welds 2 corresponding to one of the aforementioned collection and diversion devices is 3. The number of branch gas collection hoods 4 is also 3, with each of the 3 straight pipe section welds 2 and 3 branch gas collection hoods 4 arranged in a one-to-one correspondence.

[0058] Example 3

[0059] See Figures 1-3 and Figures 1-3 The other structures in this embodiment are the same as in Embodiment 1, except that the end gas collecting hood 9 is installed in the leak detection well 23, which is located in a safe area; the bottom of the leak detection well 23 is provided with backfill medium sand 21, and the end gas collecting hood 9 is installed in the space above the backfill medium sand 21; the inclined section of the diversion main pipe 8 enters the backfill medium sand 21 from the lower end of the valve well 17 and connects to the vertical section, and the vertical section extends upward from the backfill medium sand 21 and connects to the end gas collecting hood 9. Installing the end gas collecting hood 9 in the leak detection well 23 can guide the leaked gas to the leak detection well 23 for monitoring, improving the safety of inspection; the backfill medium sand 21 plays a certain role in fixing the diversion main pipe 8.

[0060] See Figures 1-3 and Figure 4 The leak detection well 23 is an independent leak detection well, serving as a leak detection point for convenient inspection by patrol personnel. The top of the end gas collection hood 9 should be 0.2m away from the independent leak detection well 23.

[0061] Referring to Figure 4 and Figures 1-2 Figure 5 Figures 1-2 Figure 5 Figures 1-2 Figure 5 The wall 18 is provided around the leak detection well 23, the inclined section passes through the wall 18 and enters the backfill sand 21, a sleeve 22 is arranged at the wall-penetrating position corresponding to the inclined section and the wall 18, and the sleeve 22 is arranged outside the inclined section and used for protecting the flow guide main pipe 8.

[0062] The above is the preferred embodiment of the present application, but the embodiment of the present application is not limited by the above content, any change, modification, replacement, combination, simplification made without departing from the spirit and principle of the present application should be an equivalent replacement method, and all are included in the protection scope of the present application.

Claims

1. A gas leak collection and diversion system, characterized in that, The gas pipeline and the collection and flow guide device are included; the collection and flow guide device includes a collection mechanism and a flow guide mechanism; the collection mechanism includes a gas collection main pipe, a plurality of branch gas collection hoods, and a gas collection branch pipe arranged between each branch gas collection hood and the gas collection main pipe; the flow guide mechanism includes a flow guide main pipe and a terminal gas collection hood; wherein, The branch gas collection hood is arranged above the gas pipeline to collect leaked gas; a plurality of branch gas collection hoods are arranged along the axial direction of the gas pipeline; the terminal gas collection hood is arranged in a safe area; one end of the gas collection branch pipe is in communication with the branch gas collection hood, and the other end is in communication with the gas collection main pipe; one end of the flow guide main pipe is in communication with the gas collection main pipe, and the other end is in communication with the terminal gas collection hood.

2. A gas leak collection and diversion system according to claim 1, wherein, A plurality of straight pipe segment welds are arranged on the gas pipeline, and the branch gas collection hoods are arranged one-to-one with the straight pipe segment welds.

3. The gas leak collecting and guiding system according to claim 1, characterized in that, The gas pipeline is provided with a straight pipe segment weld and a tee pipe; a plurality of branch gas collection hoods are arranged one-to-one with the straight pipe segment weld and the tee pipe.

4. A gas leak collection and diversion system according to any one of claims 1 to 3, wherein, The gas collection main pipe and the gas pipeline are parallel to each other.

5. The gas leak collection and diversion system of claim 1, wherein, The flow guide main pipe includes an inclined section and a vertical section; the inclined section is arranged upwardly inclined away from the gas collection main pipe; one end of the inclined section is in communication with the gas collection main pipe, and the other end is in communication with the lower end of the vertical section; the upper end of the vertical section is in communication with the terminal gas collection hood.

6. A gas leak collection and diversion system according to claim 5, wherein, The terminal gas collection hood is arranged in a valve well, and the valve well is arranged in a safe area; the bottom of the valve well is filled with backfilling medium sand, and the terminal gas collection hood is arranged in the space above the backfilling medium sand; the inclined section of the flow guide main pipe is connected with the vertical section after entering the backfilling medium sand from the lower end of the valve well, and the vertical section is connected with the terminal gas collection hood after penetrating upwardly from the backfilling medium sand.

7. A gas leak collection and diversion system according to claim 5, wherein, The terminal gas collection hood is arranged in a leak detection well, and the leak detection well is arranged in a safe area; the bottom of the leak detection well is filled with backfilling medium sand, and the terminal gas collection hood is arranged in the space above the backfilling medium sand; the inclined section of the flow guide main pipe is connected with the vertical section after entering the backfilling medium sand from the lower end of the valve well, and the vertical section is connected with the terminal gas collection hood after penetrating upwardly from the backfilling medium sand.

8. A gas leak collection and diversion system according to claim 1, wherein, The gas pipeline is arranged below a roadbed, and the roadbed is provided with a medium sand layer filled with backfilling medium sand; the gas pipeline penetrates through the medium sand layer; and the collection mechanism is arranged in the medium sand layer.

9. A gas leak collection and diversion system according to claim 8, wherein, The upper end of the medium sand layer is provided with a protective cover plate; and the roadbed and the protective cover plate are separated by a soil layer.

10. The gas leak collection and diversion system of claim 1, wherein, Both ends of the gas collection main pipe are provided with gas collection main pipe blind plates.

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