Collecting and flow guiding system for fuel gas leakage

Abstract

The invention discloses a collecting and guiding system for fuel gas leakage. The collecting and guiding system comprises a fuel gas pipeline 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 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 invention relates to the technical field of gas pipeline monitoring, and in particular to a gas leakage collection and diversion system. Background Art

[0002] Gas pipelines are spread throughout the city. Over time, some gas pipelines will age or their anti-corrosion layers will be damaged, and the problematic gas pipelines need to be updated and renovated. For municipal gas pipeline renovation, according to the scale of the renovation, it is mainly divided into two categories: partial pipeline renovation and overall pipeline renovation. On this basis, according to the specific method of renovation, partial pipeline renovation can be subdivided into three methods: partial excavation and replacement of pipes, anti-corrosion layer repair and installation of cathodic protection. Overall pipeline renovation is divided into two methods: non-excavation repair and overall pipeline replacement.

[0003] Overall pipeline replacement is to replace the gas pipeline in a certain section of road as a whole. With the rapid development of urbanization, various municipal pipelines have been laid under non-motorized vehicle lanes and sidewalks, and non-motorized vehicle lanes and sidewalks are already covered with various pipelines and facilities. Since various municipal pipelines have been laid in non-motorized vehicle lanes and sidewalks, the current overall pipeline replacement method can only be to lay new pipelines under motor vehicle lanes. In order to ensure the normal transportation of gas in gas pipelines, it is necessary to inspect and maintain the gas pipelines and monitor whether there are leaks in the gas pipelines. The existing inspection method is to inspect along the line. However, the following problems will arise if the gas pipeline is located under the motor vehicle lane:

[0004] Since the gas pipeline is located under the motor vehicle lane, it is not easy to conduct inspection and maintenance. If the previous inspection method along the line is still adopted, it will pose a certain threat to the personal safety of the inspectors, making inspection difficult. Summary of the invention

[0005] The purpose of the present invention is to overcome the above-mentioned problems and provide a gas leakage collection and diversion system, which can guide the leaked gas to a safe area, where the gas pipeline under the motor vehicle lane can be monitored for leakage, making inspection convenient and posing no threat to the personal safety of inspectors.

[0006] The purpose of the present invention is achieved through the following technical solutions:

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

[0008] The branch gas collecting hood is located above the gas pipeline and is used to collect leaked gas; multiple branch gas collecting hoods are arranged along the axial direction of the gas pipeline; the terminal gas collecting hood is located in a safe area; one end of the gas collecting branch pipe is connected to the branch gas collecting hood, and the other end is connected to the gas collecting main pipe; one end of the diversion main pipe is connected to the gas collecting main pipe, and the other end is connected to the terminal gas collecting hood.

[0009] The working principle of the above-mentioned gas leakage collection and diversion system is:

[0010] The gas pipeline is arranged below the motor vehicle lane; when the gas in the gas pipeline leaks, the leaked gas is collected by the branch gas collecting hood, enters the gas collecting branch pipe, and then is gathered through the gas collecting main pipe, and then enters the diversion main pipe, comes out from the terminal gas collecting hood, and is guided to a safe area; the leaked gas is collected and guided by the collecting mechanism and the diversion mechanism, and is guided to a safe area, and whether there is gas in the safe area can be monitored in real time. The inspection personnel inspect in the safe area to monitor whether there is leakage in the gas pipeline below the motor vehicle lane, and the inspection is convenient without posing a threat to the personal safety of the inspection personnel.

[0011] In a preferred embodiment of the present invention, the gas pipeline is provided with a plurality of straight pipe section welds, and the branch gas collecting hoods are arranged in one-to-one correspondence with the straight pipe section welds. By setting the above structure, since the straight pipe section welds are prone to gas leakage, the branch gas collecting hoods are arranged in one-to-one correspondence with the straight pipe section welds, so that the leaked gas can be well collected.

[0012] Preferably, the gas pipeline is provided with a straight pipe section weld and a three-way pipe fitting; a plurality of branch gas collecting hoods are respectively arranged in one-to-one correspondence with the straight pipe section weld and the three-way pipe fitting. In the above structure, since the straight pipe section weld and the three-way weld on the three-way pipe fitting are prone to gas leakage, the plurality of branch gas collecting hoods are respectively arranged in one-to-one correspondence with the straight pipe section weld and the three-way pipe fitting, so that the leaked gas can be well collected; the three-way welds on the three-way pipe fitting are relatively close to each other, and one branch gas collecting hood is arranged corresponding to one three-way pipe fitting, which can make the structure more compact and save costs.

[0013] Preferably, the gas collecting main pipe and the gas pipeline are parallel to each other, so as to facilitate the layout of the gas collecting branch pipes and the branch gas collecting hoods, and make the structure very compact.

[0014] Preferably, the main flow guide pipe includes an inclined section and a vertical section; the inclined section is arranged upwardly and inclined in a direction away from the main gas collecting pipe; one end of the inclined section is connected to the main gas collecting pipe, and the other end is connected to the lower end of the vertical section; the upper end of the vertical section is connected to the terminal gas collecting hood. By arranging it upwardly, it is convenient to guide the leaked gas, to transport the leaked gas, and to divert the leaked gas to a safe area.

[0015] Preferably, the terminal gas collection hood is arranged in the valve well, and the valve well is located in a safe area; the bottom of the valve well is provided with backfilled medium sand, and the terminal gas collection hood is arranged in the space above the backfilled medium sand; the inclined section of the diversion main pipe enters the backfilled medium sand from the lower end of the valve well and is connected to the vertical section, and the vertical section passes upward from the backfilled medium sand and is connected to the terminal gas collection hood. The terminal gas collection hood is arranged in the valve well, so that the leaked gas can be guided to the valve well for monitoring, thereby improving the safety of inspection; the backfilled medium sand plays a certain role in fixing the diversion main pipe.

[0016] Furthermore, the valve well is an old valve well, that is, the valve well is the valve well of the original old PE gas pipeline, and a relief valve is provided in the space above the backfilled medium sand; the relief valve is connected to the original old PE gas pipeline. In the above structure, the terminal gas collection hood is set on the old valve well, and there is no need to dig a new valve well. The original old valve well is directly used, and existing resources are utilized to realize gas monitoring, saving costs.

[0017] Preferably, the terminal gas hood is arranged in a leak detection well, and the leak detection well is located in a safe area; the bottom of the leak detection well is provided with backfilled medium sand, and the terminal gas hood is arranged in the space above the backfilled medium sand; the inclined section of the diversion main pipe enters the backfilled medium sand from the lower end of the valve well and is connected to the vertical section, and the vertical section passes upward from the backfilled medium sand and is connected to the terminal gas hood. The terminal gas hood is arranged in the leak detection well, so that the leaked gas can be guided to the leak detection well for monitoring, thereby improving the safety of the inspection; the backfilled medium sand plays a certain role in fixing the diversion main pipe.

[0018] Furthermore, the leak detection well is an independent leak detection well, which serves as a leak detection point to facilitate inspections by inspection personnel.

[0019] Preferably, the gas pipeline is arranged below the roadbed, and a medium sand layer backfilled with medium sand is arranged below the roadbed; the gas pipeline passes 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 a gas leak occurs, the branch gas collecting hood of the collecting mechanism can collect the leaked gas.

[0020] Preferably, a protective cover is provided at the upper end of the medium sand layer; a soil layer is provided between the roadbed and the protective cover. During construction, after the gas pipeline is installed, the medium sand layer is backfilled with medium sand first, so that the collection mechanism is buried with the medium sand; the gas pipeline corresponding to the collection mechanism is also buried with the medium sand, the protective cover is prevented at the upper end of the medium sand layer, and the soil is compacted and filled between the roadbed and the protective cover to form a soil layer; the soil is also compacted and filled around the medium sand layer.

[0021] Preferably, gas collecting main pipe blind plates are provided at both ends of the gas collecting main pipe, the purpose of which is to seal the two ends of the gas collecting main pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The collection and diversion system in the present invention collects and guides the leaked gas through the collection mechanism and the diversion mechanism, and guides the leaked gas to a safe area, that is, guides the leaked gas to a location that is convenient for safe maintenance; in the safe area, it is possible to monitor in real time whether there is gas, and the inspection personnel inspect in the safe area to monitor whether there is leakage in the gas pipeline under the motor vehicle lane, which is convenient for inspection and will not pose a threat to the personal safety of the inspection personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a plan view schematically showing a first specific implementation of a gas leakage collection and diversion system in the present invention.

[0025] Figure 2 for Figure 1 Cross-section along the AA direction.

[0026] Figure 3 for Figure 1 Cross-section along direction BB.

[0027] Figure 4 It is a plan view of a second specific implementation of the collecting and guiding system in the present invention.

[0028] Figure 5 It is a cross-sectional view of a third specific implementation manner of the collecting and diverting system in the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described below in conjunction with embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0030] Example 1

[0031] See also Figure 1-Figure 3The present embodiment discloses a gas leakage collection and diversion system, comprising a gas pipeline 1 and a collection and diversion device; the collection and diversion device comprises a collection mechanism and a diversion mechanism; the collection mechanism comprises a gas collecting main pipe 7, a plurality of branch gas collecting hoods 4 and a gas collecting branch pipe 5 arranged between each branch gas collecting hood 4 and the gas collecting main pipe 7; the diversion mechanism comprises a diversion main pipe 8 and a terminal gas collecting hood 9; wherein the branch gas collecting hood 4 is located above the gas pipeline 1 and is used to collect leaked gas; a plurality of branch gas collecting hoods 4 are arranged along the axial direction of the gas pipeline 1; the terminal gas collecting hood 9 is located in a safe area; one end of the gas collecting branch pipe 5 is connected to the branch gas collecting hood 4, and the other end is connected to the gas collecting main pipe 7; one end of the diversion main pipe 8 is connected to the gas collecting main pipe 7, and the other end is connected to the terminal gas collecting hood 9.

[0032] See also Figure 1-Figure 3 One end of the flow guide main pipe 8 is connected to the middle part of the gas collecting main pipe 7. Its purpose is to be located in the middle position, which makes it easier to guide the gas from the gas collecting main pipe 7 to the flow guide main pipe 8, and to gather in the middle to facilitate gas transportation.

[0033] See also Figure 1-Figure 3 The gas pipeline 1 is arranged below the roadbed. The gas pipeline 1 is a newly built gas pipeline. It adopts a unified thick-walled PE gas pipeline to reduce the number of welds as much as possible and improve the safety of the gas pipeline 1 itself. The collection and diversion system of this embodiment is arranged for each weld and the connection of the three-way pipe fitting 24; the safety area is a location convenient for safety inspection, and the leaked gas is led to a location convenient for safety inspection through the collection mechanism and the diversion mechanism.

[0034] See also Figure 1-Figure 3 In order to ensure the quality of construction and installation, the gas pipeline 1 and the collecting and diversion device of this embodiment are designed, constructed and put into operation at the same time. Since the newly built gas pipeline is located under the roadbed, the minimum soil cover thickness of the buried gas pipeline 1 (from the roadbed to the top of the gas pipeline 1) shall not be less than 0.9m.

[0035] See also Figure 1-Figure 3, the branch gas collecting hood 4 is located about 0.3m above the gas pipeline 1, and the gas pipeline 1 is provided with a straight pipe section weld 2 and a three-way pipe fitting 24; the gas pipeline 1 is divided into a plurality of straight pipe sections, and the straight pipe sections are connected by the straight pipe section weld 2, and some of the straight pipe sections are connected by the three-way pipe fitting 24, and the three-way pipe fitting 24 and the straight pipe section are welded to form a three-way weld 3; a plurality of branch gas collecting hoods 4 are respectively arranged in a one-to-one correspondence with the straight pipe section weld 2 and the three-way pipe fitting 24. In the above structure, since the straight pipe section weld 2 and the three-way weld 3 on the three-way pipe fitting 24 are prone to gas leakage, the plurality of branch gas collecting hoods 4 are respectively arranged in a one-to-one correspondence with the straight pipe section weld 2 and the three-way pipe fitting 24, which can collect the leaked gas well; the three-way welds 3 on the three-way pipe fitting 24 are closely spaced, and one branch gas collecting hood 4 is corresponding to one three-way pipe fitting 24, which can make the structure more compact and save costs.

[0036] See also Figure 1-Figure 3 The number of the collecting and guiding devices can be multiple, and one collecting and guiding device corresponds to one leak detection point. After the leak detection point is determined according to the actual situation on site, the guiding main pipe 8 is led to the leak detection point at the end, and a terminal gas collecting hood 9 is set at the leak detection point at the end, the purpose of which is to facilitate inspections and accurately check the leaking part of the gas pipeline 1. The number of branch gas collecting hoods 4 in this embodiment is 3, of which two branch gas collecting hoods 4 are set one by one with two straight pipe section welds 2, and the remaining branch gas collecting hood 4 corresponds to a three-way pipe fitting 24.

[0037] See also Figure 1-Figure 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 curbstones 11; the gas pipeline 1 is arranged below the motor vehicle lane 10; the safety area is an area 16 beside the roadbed, which may be below a crosswalk.

[0038] See also Figure 1-Figure 3 The gas collecting main pipe 7 and the gas pipeline 1 are parallel to each other. The 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] See also Figure 1-Figure 3 The main flow guide pipe 8 includes an inclined section and a vertical section; the inclined section is arranged upwardly and inclined in a direction away from the main gas collecting pipe 7; one end of the inclined section is connected to the main gas collecting pipe 7, and the other end is connected to the lower end of the vertical section; the upper end of the vertical section is connected to the terminal gas collecting hood 9. By being arranged upwardly and inclined, it is convenient to guide the leaked gas, to transport the leaked gas, and to guide the leaked gas to a safe area.

[0040] See also Figure 1-Figure 3 , the slope of the inclined section is 0.2%.

[0041] See also Figure 1-Figure 3 In this embodiment, the terminal gas collection hood 9 is shared with the valve well 17, and the terminal gas collection hood 9 is arranged in the valve well 17, and the valve well 17 is located in a safe area; the bottom of the valve well 17 is provided with backfilled medium sand 21, and the terminal gas collection hood 9 is arranged in the space above the backfilled medium sand 21; the inclined section of the diversion main pipe 8 enters the backfilled medium sand 21 from the lower end of the valve well 17 and is connected to the vertical section, and the vertical section passes upward from the backfilled medium sand 21 and is connected to the terminal gas collection hood 9. By arranging the terminal gas collection hood 9 in the valve well 17, the leaked gas can be guided to the valve well 17 for monitoring, thereby improving the safety of inspection; the backfilled medium sand 21 plays a certain fixing role on the diversion main pipe 8.

[0042] See also Figure 1-Figure 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 set in the side area 16 of the roadbed; the space above the backfilled medium sand 21 is provided with a relief valve 20; the relief valve 20 is connected to the original old PE gas pipeline 19. In the above structure, the terminal gas collection hood 9 is set on the old valve well, and there is no need to dig the valve well 17 from scratch. The original old valve well is directly used, and the existing resources are used to realize gas monitoring, which saves costs.

[0043] See also Figure 1-Figure 3 , the top elevation of the terminal air collecting hood 9 should be lower than the valve port elevation of the relief valve 20.

[0044] See also Figure 1-Figure 3 A wall 18 is provided around the valve well 17. The inclined section passes through the wall 18 and enters the backfill medium sand 21. A casing 22 is provided at the wall penetration point corresponding to the inclined section and the wall 18. The casing 22 is sleeved on the outside of the inclined section to protect the diversion main pipe 8.

[0045] See also Figure 1-Figure 3 A medium sand layer 12 filled with medium sand is provided below the roadbed; the gas pipeline 1 passes through the medium sand layer 12; and the collecting mechanism is located in the medium sand layer 12. By providing the medium sand layer 12, the medium sand layer 12 has air permeability, and when gas leakage occurs, the branch gas collecting hood 4 of the collecting mechanism can collect the leaked gas.

[0046] See also Figure 1-Figure 3, a protective cover plate 13 is provided at the upper end of the medium sand layer 12; a soil layer 14 is provided between the roadbed and the protective cover plate 13. During construction, after the gas pipeline 1 is installed, the medium sand 21 is first backfilled in the medium sand layer 12, so that the collecting mechanism is buried by the medium sand; the gas pipeline 1 corresponding to the collecting mechanism is also buried by the medium sand, and the upper end of the medium sand layer 12 is protected from the protective cover plate 13, and the soil between the roadbed and the protective cover plate 13 is compacted to form a soil layer 14; the surroundings of the medium sand layer 12 are also compacted.

[0047] See also Figure 1-Figure 3 , the protective cover plate 13 is a PE protective cover plate.

[0048] See also Figure 1-Figure 3 After the gas pipeline 1 is installed, medium sand backfilling should be adopted in time. After the medium sand is backfilled to 0.05m above the top of the gas pipeline 1, it should be tapped and compacted from both ends of the trench to the center of the gas pipeline 1.

[0049] See also Figure 1-Figure 3 Gas collecting main pipe blind plates 6 are provided at both ends of the gas collecting main pipe 7, and the purpose is to seal the two ends of the gas collecting main pipe 7.

[0050] See also Figure 1-Figure 3 In this embodiment, the branch gas collecting hood 4, gas collecting branch pipe 5, gas collecting main pipe 7, diversion main pipe 8, and terminal gas collecting hood 9 are all made of PVC-U material. PVC-U uses polyvinyl chloride as the main raw material, adds a stabilizer and then is extruded and molded, and is produced through cooling, solidification and other processes. PVC-U has significant advantages such as light weight, strong corrosion resistance, good pressure resistance, small fluid resistance and low price. Considering that the leakage at the weld of the gas pipeline 1 (not caused by third-party damage) is usually small, the pipe diameter of the gas collecting branch pipe 5 is uniformly selected as φ25mm, and the gas collecting main pipe 7 and the diversion main pipe 8 are uniformly selected as φ50mm. The interfaces between the branch gas collecting hood 4, the gas collecting branch pipe 5, the gas collecting main pipe 7, the diversion main pipe 8, and the terminal gas collecting hood 9 are all bonded with glue.

[0051] See also Figure 1-Figure 3 The buried depth of the gas pipeline 1 should be determined comprehensively based on factors such as the freezing depth, external load, and intersections with other pipelines. In this embodiment, the buried depth can be 0.20m below the freezing line and should meet the following conditions: When φ≤50mm, the minimum buried depth of the top of the gas pipeline 1 is 0.50m.

[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 must be laid on the foundation with a thickness of 0.15 to 0.20 m. In order to prevent uneven settlement of the collection and diversion device, the backfill soil is compacted in layers.

[0053] See also Figure 1-Figure 3The working principle of the above-mentioned gas leakage collection and diversion system is:

[0054] The gas pipeline 1 is arranged below the motor vehicle lane 10; when the gas in the gas pipeline 1 leaks, the leaked gas is collected by the branch gas collecting hood 4, enters the gas collecting branch pipe 5, and then converges through the gas collecting main pipe 7, and then enters the diversion main pipe 8, comes out from the terminal gas collecting hood 9, and is guided to a safe area; the leaked gas is collected and guided by the collecting mechanism and the diversion mechanism, and is guided to a safe area. In the safe area, it can be monitored in real time whether there is gas. The patrol personnel patrol in the safe area to monitor whether the gas pipeline 1 located below the motor vehicle lane 10 is leaking. The patrol inspection is convenient and will not pose a threat to the personal safety of the patrol personnel.

[0055] Example 2

[0056] See also Figure 4 The other structures of this embodiment are the same as those of the embodiment 1, except that a plurality of straight pipe section welds 2 are provided on the gas pipeline 1, and the branch gas collecting hoods 4 are arranged in one-to-one correspondence with the straight pipe section welds 2. By setting the above structure, since the straight pipe section welds 2 are prone to gas leakage, the branch gas collecting hoods 4 are arranged in one-to-one correspondence with the straight pipe section welds 2, so that the leaked gas can be well collected.

[0057] See also Figure 4 The number of the straight pipe section welds 2 corresponding to one of the collecting and guiding devices is 3. The number of the branch gas collecting hoods 4 is also 3, and the three straight pipe section welds 2 are arranged in one-to-one correspondence with the three branch gas collecting hoods 4.

[0058] Example 3

[0059] See also Figure 1-Figure 2 and Figure 5 The other structures of this embodiment are the same as those of the embodiment 1, except that the terminal gas collecting hood 9 is arranged in the leak detection well 23, and the leak detection well 23 is located in a safe area; the bottom of the leak detection well 23 is provided with backfilled medium sand 21, and the terminal gas collecting hood 9 is arranged in the space above the backfilled medium sand 21; the inclined section of the diversion main pipe 8 enters the backfilled medium sand 21 from the lower end of the valve well 17 and is connected to the vertical section, and the vertical section passes upward from the backfilled medium sand 21 and is connected to the terminal gas collecting hood 9. The terminal gas collecting hood 9 is arranged in the leak detection well 23, so that the leaked gas can be guided to the leak detection well 23 for monitoring, thereby improving the safety of the inspection; the backfilled medium sand 21 plays a certain role in fixing the diversion main pipe 8.

[0060] See also Figure 1-Figure 2 and Figure 5 The leak detection well 23 is an independent leak detection well, which is used as a leak detection point to facilitate inspection by inspection personnel. The top of the terminal gas collecting hood 9 is preferably 0.2m away from the independent leak detection well 23.

[0061] See also Figure 1-Figure 2 and Figure 5 A wall 18 is provided around the leak detection well 23. The inclined section passes through the wall 18 and enters the backfill medium sand 21. A casing 22 is provided at the wall penetration point corresponding to the inclined section and the wall 18. The casing 22 is sleeved on the outside of the inclined section to protect the diversion main pipe 8.

[0062] The above is a preferred embodiment of the present invention, but the embodiment of the present invention is not limited to the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A gas leakage collection and diversion system, characterized in that: It includes a gas pipeline and a collecting and guiding device; the collecting and guiding device includes a collecting mechanism and a guiding mechanism; the collecting mechanism includes a gas collecting main pipe, a plurality of branch gas collecting hoods, and a gas collecting branch pipe arranged between each branch gas collecting hood and the gas collecting main pipe; the guiding mechanism includes a guiding main pipe and a terminal gas collecting hood; wherein, The branch gas collecting hood is located above the gas pipeline and is used to collect leaked gas; multiple branch gas collecting hoods are arranged along the axial direction of the gas pipeline; the terminal gas collecting hood is located in a safe area; one end of the gas collecting branch pipe is connected to the branch gas collecting hood, and the other end is connected to the gas collecting main pipe; one end of the diversion main pipe is connected to the gas collecting main pipe, and the other end is connected to the terminal gas collecting hood.

2. A gas leakage collection and diversion system according to claim 1, characterized in that: The gas pipeline is provided with a plurality of straight pipe section welds, and the branch gas collecting hoods are arranged in one-to-one correspondence with the straight pipe section welds.

3. A gas leakage collection and diversion system according to claim 1, characterized in that: The gas pipeline is provided with a straight pipe section weld and a three-way pipe fitting; a plurality of branch gas collecting hoods are respectively arranged corresponding to the straight pipe section weld and the three-way pipe fitting.

4. A gas leakage collection and diversion system according to any one of claims 1 to 3, characterized in that: The gas collecting main pipe and the gas pipeline are parallel to each other.

5. A gas leakage collection and diversion system according to claim 1, characterized in that: The main flow guide pipe includes an inclined section and a vertical section; the inclined section is arranged to be inclined upward in a direction away from the gas collecting main pipe; one end of the inclined section is connected to the gas collecting main pipe, and the other end is connected to the lower end of the vertical section; the upper end of the vertical section is connected to the terminal gas collecting hood.

6. A gas leakage collection and diversion system according to claim 5, characterized in that: The terminal air collecting hood is arranged in the valve well, and the valve well is located in a safe area; the bottom of the valve well is provided with backfill medium sand, and the terminal air collecting hood is arranged in the space above the backfill medium sand; the inclined section of the diversion main pipe enters the backfill medium sand from the lower end of the valve well and is connected to the vertical section, and the vertical section passes upward from the backfill medium sand and is connected to the terminal air collecting hood.

7. A gas leakage collection and diversion system according to claim 5, characterized in that: The terminal air collecting hood is arranged in the leak detection well, and the leak detection well is located in a safe area; the bottom of the leak detection well is provided with backfill medium sand, and the terminal air collecting hood is arranged in the space above the backfill medium sand; the inclined section of the diversion main pipe enters the backfill medium sand from the lower end of the valve well and is connected to the vertical section, and the vertical section passes upward from the backfill medium sand and is connected to the terminal air collecting hood.

8. A gas leakage collection and diversion system according to claim 1, characterized in that: The gas pipeline is arranged below the roadbed, and a medium sand layer backfilled with medium sand is arranged below the roadbed; the gas pipeline passes through the medium sand layer; and the collecting mechanism is located in the medium sand layer.

9. A gas leakage collection and diversion system according to claim 8, characterized in that: A protective cover plate is arranged on the upper end of the middle sand layer; and a soil layer is arranged between the roadbed and the protective cover plate.

10. A gas leakage collection and diversion system according to claim 1, characterized in that: Gas collecting main pipe blind plates are arranged at both ends of the gas collecting main pipe.

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