Anti-corrosion structure for gas pipeline under non-motorized vehicle lane

Abstract

The utility model discloses a gas pipeline anti-corrosion structure under a non-motorized vehicle lane, and belongs to the technical field of municipal gas pipeline construction. The structure comprises a non-motorized vehicle lane, a test pile, an anti-corrosion mechanism, a reference electrode and a gas pipe, the test pile is embedded in the non-motorized vehicle lane, the top surface of the test pile is not higher than the top surface of the non-motorized vehicle lane, and the anti-corrosion mechanism, the reference electrode and the gas pipe are all embedded below the test pile and are respectively connected with the test pile through cables. As the top surface of the test pile is not higher than the top surface of the non-motorized vehicle lane, the test pile does not influence the normal passage of the non-motorized vehicles on the non-motorized vehicle lane. The testing pile and the anti-corrosion mechanism are matched to improve the anti-corrosion performance of the gas pipe and prolong the service life of the gas pipe.

Description

Technical Field

[0001] The utility model relates to an anti-corrosion structure of a gas pipeline under a non-motor vehicle lane, belonging to the technical field of municipal gas pipeline construction. Background Technique

[0002] Steel gas pipelines are usually laid in a directly buried manner. Since the pipelines are buried underground for too long, serious aging and corrosion will occur. The corrosion problem of steel gas pipelines affects the service life of the pipelines. For the anti-corrosion protection of steel gas pipelines, the method of externally connecting a more active metal object (i.e., sacrificial anode) is often used for protection, so that the corrosion of the environment to the gas pipeline is manifested as the corrosion of the sacrificial anode.

[0003] For example, the Chinese patent document with the publication number CN219752438U discloses a field test and implementation system for targeted protection of corrosion hot spots in a community gas pipeline network, including: a test pile, and the test pile is arranged above the gas pipeline to be protected; the test pile is connected with a sacrificial anode and a corrosion inspection piece; an insulation device, and the insulation device is arranged between the medium-pressure pipeline and the low-pressure pipeline; between the low-pressure buried pipeline and the household pipeline; a sacrificial anode, and sacrificial anodes are installed on the community buried gas pipeline network, and 1 group of magnesium alloy sacrificial anodes is buried every 100 m, and each group of sacrificial anodes consists of 1 to 2 sacrificial anodes; a corrosion inspection piece, and the corrosion inspection piece is arranged on the buried gas pipeline in the hot spot area. It can effectively inhibit the corrosion of the corrosion hot spots of the buried gas pipeline.

[0004] However, a part of the test pile in this system protrudes above the ground. When this system is applied to the gas pipeline under the non-motor vehicle lane, the test pile protruding above the ground will affect the normal passage of non-motor vehicles. Content of the Utility Model

[0005] In order to solve the above technical problems, the utility model provides an anti-corrosion structure of a gas pipeline under a non-motor vehicle lane.

[0006] The utility model is realized through the following technical solutions:

[0007] An anti-corrosion structure of a gas pipeline under a non-motor vehicle lane includes a non-motor vehicle lane, a test pile, an anti-corrosion mechanism, a reference electrode and a gas pipeline. The test pile is buried on the non-motor vehicle lane, and the top surface of the test pile is not higher than the top surface of the non-motor vehicle lane. The anti-corrosion mechanism, the reference electrode and the gas pipeline are all buried below the test pile and are respectively connected to the test pile through cables.

[0008] The test pile includes a foundation pit, a cast iron protective cover, and a junction box. A dry river sand layer A is laid at the bottom of the foundation pit. The cast iron protective cover is placed on the dry river sand layer A, and a manhole cover is installed at the upper end of the cast iron protective cover. Concrete blocks are poured between the outer wall of the cast iron protective cover and the side wall of the foundation pit. And a dry river sand layer B is laid on the dry river sand layer A inside the cast iron protective cover. The junction box is arranged on the dry river sand layer B inside the cast iron protective cover.

[0009] The buried depths of the anti-corrosion mechanism, the reference electrode, and the gas pipeline are the same.

[0010] The anti-corrosion mechanism includes two anti-corrosion components, and the two anti-corrosion components are symmetrically arranged on both sides of the gas pipeline.

[0011] The distance from the anti-corrosion component to the outer wall of the gas pipeline is 0.5 m to 5 m.

[0012] The distance from the anti-corrosion component to the ground is not less than 1 m.

[0013] The anti-corrosion component includes a porous cotton cloth bag and a sacrificial anode. The sacrificial anode is located inside the porous cotton cloth bag, and backfill material is filled between the sacrificial anode and the inner wall of the porous cotton cloth bag.

[0014] The thickness of the backfill material around the sacrificial anode is 50 mm to 400 mm.

[0015] The reference electrode is located between the gas pipeline and one of the anti-corrosion components.

[0016] The beneficial effects of the present utility model are as follows: Since the top surface of the test pile is not higher than the top surface of the non-motor vehicle lane, the test pile will not affect the normal passage of non-motor vehicles on the non-motor vehicle lane. The cooperation between the test pile and the anti-corrosion mechanism improves the anti-corrosion performance of the gas pipeline and prolongs the service life of the gas pipeline. Description of the Drawings

[0017] Figure 1 It is a structural schematic diagram of the present utility model.

[0018] In the figure: 1 - test pile, 10 - foundation pit, 11 - concrete block, 12 - manhole cover, 13 - junction box, 14 - cast iron protective cover, 15 - dry river sand layer A, 16 - dry river sand layer B, 2 - cable, 3 - anti-corrosion component, 30 - porous cotton cloth bag, 31 - sacrificial anode, 32 - backfill material, 4 - reference electrode, 5 - gas pipeline, 6 - non-motor vehicle lane. Detailed Embodiments

[0019] The technical solutions of the present utility model will be further described below, but the scope of protection claimed is not limited thereto.

[0020] As Figure 1As shown in the figure, a corrosion prevention structure for a gas pipeline under a non-motor vehicle lane of the present utility model includes a non-motor vehicle lane 6, a test pile 1, a corrosion prevention mechanism, a reference electrode 4, and a gas pipeline 5. The test pile 1 is buried on the non-motor vehicle lane 6, and the top surface of the test pile 1 is not higher than the top surface of the non-motor vehicle lane 6. The corrosion prevention mechanism, the reference electrode 4, and the gas pipeline 5 are all buried below the test pile 1 and are respectively connected to the test pile 1 through cables 2. During use, since the top surface of the test pile 1 is not higher than the top surface of the non-motor vehicle lane 6, the test pile 1 will not affect the normal passage of non-motor vehicles on the non-motor vehicle lane 6. The test pile 1 and the corrosion prevention mechanism cooperate to improve the corrosion prevention performance of the gas pipeline 5 and extend the service life of the gas pipeline 5.

[0021] The test pile 1 includes a foundation pit 10, a cast iron protective cover 14, and a junction box 13. A dry river sand layer A15 is laid at the bottom of the foundation pit 10. The cast iron protective cover 14 is placed on the dry river sand layer A15, and a manhole cover 12 is installed at the upper end of the cast iron protective cover 14. Concrete blocks 11 are poured between the outer wall of the cast iron protective cover 14 and the side wall of the foundation pit 10. A dry river sand layer B16 is laid on the dry river sand layer A15 inside the cast iron protective cover 14, and the junction box 13 is arranged on the dry river sand layer B16 inside the cast iron protective cover 14. During use, the test pile 1 is electrically connected to the sacrificial anode 31, the gas pipeline 5, and the reference electrode 4 through cables 2 respectively. The manhole cover 12 is marked with "gas". The cast iron protective cover 14 is fixed in the foundation pit 10 through the concrete blocks 11.

[0022] The corrosion prevention mechanism, the reference electrode 4, and the gas pipeline 5 have the same burial depth.

[0023] The corrosion prevention mechanism includes two corrosion prevention components 3, and the two corrosion prevention components 3 are symmetrically arranged on both sides of the gas pipeline 5.

[0024] The distance from the corrosion prevention component 3 to the outer wall of the gas pipeline 5 is 0.5 m to 5 m.

[0025] The distance from the corrosion prevention component 3 to the ground is not less than 1 m.

[0026] The anti-corrosion component 3 includes a porous cotton cloth bag 30 and a sacrificial anode 31. The sacrificial anode 31 is located inside the porous cotton cloth bag 30, and a backfill material 32 is filled between the sacrificial anode 31 and the inner wall of the porous cotton cloth bag 30. During use, the burial location of the sacrificial anode 31 should avoid steep slopes or retaining walls, and should preferably be selected in flat areas. Moreover, the sacrificial anode 31 should be buried below the frost line. There should be no metal structures between the sacrificial anode 31 and the gas pipe 5. In addition, the burial location of the sacrificial anode 31 should avoid places with severe alternating current interference to prevent polarity reversal. Before installation, the surface of the sacrificial anode 31 should be treated to remove surface oil stains and oxides to make it show a metallic luster. The cable 2 and the steel core of the sacrificial anode 31 are soldered with tin. The bilateral weld length is not less than 50 mm. After welding, the weld is coated with epoxy paint and then wrapped with plastic insulating tape once, and then sealed and insulated with a heat shrinkage sleeve.

[0027] The thickness of the backfill material 32 around the sacrificial anode 31 is 50 mm to 400 mm. No stones, soil, or weeds should be mixed into the backfill material 32. The functions of the backfill material 32 are as follows: to change the adjacent relationship between the sacrificial anode 31 and the soil to the adjacent relationship between the sacrificial anode 31 and the backfill material 32, to improve the working environment of the sacrificial anode 31, to reduce the grounding resistance of the sacrificial anode 31, to increase the output current of the sacrificial anode 31, the chemical composition of the filler is conducive to the dissolution of the products of the sacrificial anode 31, without caking, to reduce unnecessary polarization of the sacrificial anode 31, and to maintain the long-term wetness of the sacrificial anode 31 ground bed.

[0028] The reference electrode 4 is located between the gas pipe 5 and one of the anti-corrosion components 3. The material of the reference electrode 4 is the same as that of the steel gas pipe 5, which is equivalent to the corrosion inspection piece in the prior art.

Claims

1. An anti-corrosion structure for gas pipelines under non-motor vehicle lanes, characterized in that: It includes a non-motor vehicle lane (6), a test pile (1), an anti-corrosion mechanism, a reference electrode (4) and a gas pipeline (5). The test pile (1) is buried on the non-motor vehicle lane (6), and the top surface of the test pile (1) is not higher than the top surface of the non-motor vehicle lane (6). The anti-corrosion mechanism, the reference electrode (4) and the gas pipeline (5) are all buried below the test pile (1) and are respectively connected to the test pile (1) through cables (2). The test pile (1) includes a foundation pit (10), a cast iron protective cover (14) and a junction box (13). A dry river sand layer A (15) is laid at the bottom of the foundation pit (10). The cast iron protective cover (14) is placed on the dry river sand layer A (15), and a manhole cover (12) is installed at the upper end of the cast iron protective cover (14). Concrete blocks (11) are poured between the outer wall of the cast iron protective cover (14) and the side wall of the foundation pit (10). A dry river sand layer B (16) is laid on the dry river sand layer A (15) inside the cast iron protective cover (14). The junction box (13) is arranged on the dry river sand layer B (16) inside the cast iron protective cover (14).

2. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 1, wherein: The anti-corrosion mechanism, the reference electrode (4) and the gas pipeline (5) have the same burial depth.

3. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 1, wherein: The anti-corrosion mechanism includes two anti-corrosion components (3), and the two anti-corrosion components (3) are symmetrically arranged on both sides of the gas pipeline (5).

4. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 3, characterized in that: The distance from the anti-corrosion component (3) to the outer wall of the gas pipeline (5) is 0.5 m to 5 m.

5. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 3, characterized in that: The distance from the anti-corrosion component (3) to the ground is not less than 1 m.

6. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 3, characterized in that: The anti-corrosion component (3) includes a porous cotton cloth bag (30) and a sacrificial anode (31). The sacrificial anode (31) is located inside the porous cotton cloth bag (30), and a backfill material (32) is filled between the sacrificial anode (31) and the inner wall of the porous cotton cloth bag (30).

7. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 6, characterized in that: The thickness of the backfill material (32) around the sacrificial anode (31) is 50 mm to 400 mm.

8. The anti-corrosion structure of the gas pipeline under the non-motor vehicle lane according to claim 3, wherein: The reference electrode (4) is located between the gas pipeline (5) and one of the anti-corrosion components (3).

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