Steel buried pipeline laying structure

Abstract

The utility model discloses a laying structure of a steel buried pipeline. Comprising a plurality of pipeline bodies which are arranged in parallel, at least one pipeline body is connected with a cathode protection structure, a voltage-sharing cable is connected between every two adjacent pipeline bodies, and the two ends of each voltage-sharing cable are electrically connected with the pipeline bodies on the corresponding sides respectively. The cathode protection structure comprises a plurality of sacrificial anode units which are sequentially arranged at intervals in the axial direction of the pipeline body, and the sacrificial anode units are electrically connected with the pipeline body. The device is simple in structure and convenient to install on site, the problem of steel pipeline protection can be effectively solved, the adjacent pipeline bodies are connected through the voltage-sharing cables, so that the voltage between the pipelines is equal and lower than that of the sacrificial anode units, the voltage-sharing cables can ensure that the parallel pipelines are protected by the sacrificial anode units, and the service life of the pipelines is prolonged. And on the premise that the pipeline body is protected, the cost is saved, and the construction difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline anti-corrosion, in particular to a laying structure of a steel buried pipeline. Background Technique

[0002] For steel pipelines buried underground, anti-corrosion treatment is usually required. If the metal surface is exposed to contact with groundwater, a micro battery will be formed with the metal surface, which will cause corrosion to the pipeline surface.

[0003] The existing steel pipelines usually adopt the sacrificial anode cathodic protection method to protect the steel pipelines. The usual practice is to directly weld the sacrificial anode blocks on the steel pipelines. When there are multiple steel pipelines, sacrificial anode blocks need to be set on each steel pipeline, with a large workload and high cost. In addition, when setting the sacrificial anode blocks, a relatively large protective coating on the pipeline surface needs to be damaged, causing certain damage to the pipeline itself. Content of the Utility Model

[0004] In order to solve the above problems, the utility model provides a laying structure of a steel buried pipeline, which includes a plurality of pipeline bodies arranged in parallel. At least one of the pipeline bodies is connected with a cathodic protection structure. A voltage equalizing cable is connected between every two adjacent pipeline bodies, and both ends of the voltage equalizing cable are electrically connected to the corresponding pipeline bodies on both sides. The cathodic protection structure includes a plurality of sacrificial anode units arranged at intervals along the axial direction of the pipeline body, and the sacrificial anode units are electrically connected to the pipeline body.

[0005] Further, the connection point of the voltage equalizing cable and the pipeline body provided with the sacrificial anode unit is close to the connection position of the sacrificial anode unit and the pipeline body.

[0006] Further, the voltage equalizing cable is welded to the pipeline body by thermite welding, and the sacrificial anode unit is welded to the pipeline body by thermite welding.

[0007] Further, insulating layers are provided at the connection between the voltage equalizing cable and the pipeline body and at the connection between the sacrificial anode unit and the pipeline body.

[0008] Further, the sacrificial anode unit includes at least one sacrificial anode assembly. The sacrificial anode assembly includes an anode package, an anode block, and an anode cable. The anode block is arranged in the anode package, and the anode block is electrically connected to the pipeline body through the anode cable.

[0009] Further, the distance between the anode block and the pipeline body is not less than 1m.

[0010] Further, the sacrificial anode unit includes a plurality of sacrificial anode components, and the connection points of each anode cable to the pipeline body are arranged at intervals along the axial direction of the pipeline body, and the distance between adjacent connection points is 30-50 mm.

[0011] Further, the anode block is a magnesium anode block or a zinc anode block.

[0012] Further, the pipeline body is a casing structure, including an inner steel pipe and an outer steel pipe. The outer steel pipe is sleeved outside the inner steel pipe through a steel pipe bracket, and the equalizing cable and the sacrificial anode unit are connected to the outer steel pipe.

[0013] Due to the adoption of the above technical solutions, the present utility model has the following beneficial effects compared with the prior art:

[0014] The steel buried pipeline laying structure provided by the present utility model has a simple structure and is convenient for on-site installation. It can effectively solve the problem of steel pipeline protection. By using an equalizing cable to connect adjacent pipeline bodies, the voltage between each pipeline is equal and lower than the voltage of the sacrificial anode unit. The equalizing cable can ensure that parallel pipelines are protected by the sacrificial anode unit, saving the usage amount of the sacrificial anode unit, saving costs and reducing the construction difficulty on the premise of protecting the pipeline body. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a schematic structural diagram of the steel buried pipeline laying structure provided by the present utility model;

[0017] Figure 2 In the steel buried pipeline laying structure provided by the present utility model Figure 1 is a cross-sectional view.

[0018] 1 - First pipeline body; 11 - Inner steel pipe; 12 - Outer steel pipe; 13 - Steel pipe bracket; 2 - Second pipeline body; 3 - Equalizing cable; 4 - Sacrificial anode unit; 41 - Anode package; 42 - Anode block; 43 - Anode cable; 5 - Ground; 6 - Insulation layer. Detailed Embodiments

[0019] The technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model. In the accompanying drawings, for the sake of clarity, the dimensions and relative dimensions of some parts may be enlarged.

[0020] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected" and "coupled" shall be interpreted in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium. It may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0021] In the description of the present utility model, the orientation or positional relationships such as "upper", "lower", "left", "right", "front", "rear", "center", "horizontal", "vertical", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model.

[0022] In addition, in the description of the present utility model, the terms "first" and "second" are only used for distinction in description, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In addition, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0023] The present utility model provides a steel buried pipeline laying structure, which includes a plurality of pipeline bodies arranged in parallel. The pipeline bodies are steel pipelines. At least one of the pipeline bodies is connected with a cathodic protection structure. A plurality of equalizing cables 3 are connected between every two adjacent pipeline bodies. The two ends of the equalizing cable 3 are electrically connected to the pipeline bodies on the corresponding sides respectively. The cathodic protection structure includes a plurality of sacrificial anode units 4 arranged at intervals along the axial direction of the pipeline body. The sacrificial anode unit 4 is electrically connected to the pipeline body. The steel pipeline laying structure in this embodiment is applicable to protecting steel buried pipelines in soil, water, swamp or wetland environments with relatively low resistivity.

[0024] In some embodiments, if the corrosion degree of the pipeline body in the buried section is relatively large, the number of sacrificial anode units 4 can be increased, and the distance between adjacent sacrificial anode units 4 is reduced to increase the layout density of the sacrificial anode units 4, thereby improving the corrosion resistance of the steel pipeline. Alternatively, a cathodic protection structure can be provided on each pipeline body to improve the corrosion resistance of the steel pipeline. Preferably, a cathodic protection structure is provided on each pipeline body, and adjacent pipeline bodies are connected by a voltage equalizing cable 3. After the sacrificial anode unit on one pipeline body is consumed, the sacrificial anode units 4 on other pipeline bodies can be consumed to prevent the pipeline body from being corroded, effectively extending the service life of the pipeline body.

[0025] In some embodiments, if the number of pipeline bodies is large, a cathodic protection structure is provided on the spaced pipeline bodies, and adjacent pipeline bodies are connected by a voltage equalizing cable 3 to ensure the anti-corrosion effect of each pipeline body. For example, if the number of pipeline bodies is three, a cathodic protection structure can be provided on the middle pipeline body, and the pipeline bodies on both sides are respectively connected to the middle pipeline body through the voltage equalizing cable 3. If the number of pipeline bodies is four, a cathodic protection structure can be provided on two spaced pipeline bodies, and adjacent pipeline bodies are connected by a voltage equalizing cable 3. Of course, whether the cathodic protection structure is provided on each pipeline body can be adjusted according to the buried environment.

[0026] Preferably, in order to improve the anti-corrosion performance of the pipeline body, an anti-corrosion layer is coated on the outer side of the pipeline body.

[0027] In this embodiment, as shown in the attached Figure 1 and 2 of the specification, where Figure 2 is the A-A cross-sectional view of Figure 1 , the number of pipeline bodies is two, which are respectively denoted as the first pipeline body 1 and the second pipeline body 2. The first pipeline body 1 and the second pipeline body 2 are arranged in parallel at intervals, and the distance between the first pipeline body 1 and the second pipeline body 2 is greater than 2 m. A cathodic protection structure is provided on the first pipeline body 1, and multiple sacrificial anode units 4 are arranged at intervals along the axial direction of the first pipeline body 1. The second pipeline body 2 is connected to the first pipeline body 1 through multiple voltage equalizing cables 3, and the voltage equalizing cables 3 are arranged in one-to-one correspondence with the sacrificial anode units 4. The second pipeline body 2 is protected by the sacrificial anode units 4 connected to the first pipeline body 1. The metal in the sacrificial anode unit 4 has strong reducibility and forms a primary battery with the pipeline body metal. The metal with strong reducibility acts as the negative electrode and undergoes an oxidation reaction and is consumed, and the pipeline body metal acts as the positive electrode to avoid corrosion, effectively protecting the first pipeline body 1. When the second pipeline body 2 is connected to the first pipeline body 1 through the voltage equalizing cable 3, the voltages of the second pipeline body 2 and the first pipeline body 1 are equal and lower than the voltage of the sacrificial anode unit 4, and at the same time, sacrificial anode protection can also be carried out on the second pipeline body 2.

[0028] Optimized implementation mode. A plurality of sacrificial anode units 4 are arranged on the first pipeline body 1 at intervals along the axial direction of the pipeline. Each sacrificial anode unit 4 includes at least one sacrificial anode assembly. The sacrificial anode assembly includes an anode package 41, an anode block 42, and an anode cable 43. The anode block 42 is arranged in the anode package 41, and the anode block 42 is connected to the first pipeline body 1 through the anode cable 43. The anode block 42 is rod-shaped. The anode block 42 is arranged in the anode package 41 and is wrapped by the filler in the anode package 41, which can prevent the anode block 42 from being impacted during transportation or installation. One end of the anode cable 43 is electrically connected to the anode block 42, and the other end is electrically connected to the first pipeline body 1 by thermite welding.

[0029] In some embodiments, to avoid affecting the connection between the anode cable 43 and the first pipeline body 1 during later soil landfill, the anode cable 43 can be wound around the first pipeline body 1 for one week and then welded, or after welding, the anode cable 43 and the first pipeline body 1 can be reinforced by cable ties.

[0030] Optimized implementation mode. The distance between the anode block 42 and both the first pipeline body 1 and the second pipeline body is not less than 1m.

[0031] Optimized implementation mode. The anode block 42 is rod-shaped, and the corresponding anode package 41 is strip-shaped. The anode package 41 can be buried underground in a vertical or horizontal manner. The installation of the anode package should ensure that the burial depth of the top of the anode block from the ground is not less than 1m. The anode package is preferably installed vertically.

[0032] Optimized implementation mode. The sacrificial anode unit 4 includes four sacrificial anode assemblies. The sacrificial anode assemblies are arranged in two on both sides of the first pipeline body 1 respectively, and each sacrificial anode assembly is connected to the first pipeline body 1. Specifically, the connection points of each anode cable 43 and the first pipeline body 1 are arranged at intervals in sequence along the axial direction of the first pipeline body 1, and the distance between adjacent connection points is 30 - 50mm. Of course, the number of sacrificial anode assemblies in each sacrificial anode unit 4 can be set according to actual needs, and the use of sacrificial anode assemblies can be appropriately increased or decreased.

[0033] Preferably, for the two sacrificial anode assemblies on the same side of the first pipeline body 1, the distance between their anode packages 41 is 2 - 3m.

[0034] The installation process of the sacrificial anode unit 4 on the first pipeline body 1 is as follows: First, determine the position on the first pipeline body 1 where the sacrificial anode unit 4 is to be installed. Then, remove the pipeline anti-corrosion layer in a 50mm * 200mm area at the installation position, and polish the surface of the first pipeline body 1 to ensure the pipeline surface is clean. Use thermite welding to weld four anode cables 43 to the first pipeline body 1 along the axial direction of the pipeline at intervals of 40mm in sequence. Then, set an insulating layer 6 at the connection between the anode cable 43 and the first pipeline body 1 for insulation treatment.

[0035] Preferably, the equalizing cable 3 is connected to the first pipeline body 1 and the second pipeline body 2 respectively by thermite welding, and the connection points are both insulated with an insulating layer 6. In this embodiment, using thermite welding points can ensure the effective connection of the anode cable and the equalizing cable to the pipeline to be protected.

[0036] Preferably, the insulating layer 6 can be epoxy resin fiberglass cloth, and the connection point is insulated by wrapping with epoxy resin fiberglass cloth; the insulating layer 6 can also be the original pipeline anti-corrosion layer. After welding, a corrosion protection layer is coated and wrapped at the connection point for insulation.

[0037] In an optimized implementation manner, the equalizing cable 3 is provided corresponding to the sacrificial anode unit 4 one by one, and the distance between the connection point of the equalizing cable 3 and the first pipeline body 1 and the connection point of the anode cable 43 and the first pipeline body 1 is 40mm.

[0038] In an optimized implementation manner, the anode block 42 is a magnesium anode block or a zinc anode block.

[0039] In an optimized implementation manner, the pipeline body is a casing structure. Taking the first pipeline body 1 as an example, as shown in the attached drawings of the specification Figure 2 The first pipeline body 1 includes an inner steel pipe 11 and an outer steel pipe 12. The outer steel pipe 12 is sleeved outside the inner steel pipe 11 through a steel pipe bracket 13. The equalizing cable 3 and the sacrificial anode unit 4 are connected to the outer steel pipe 12. The inner steel pipe 11 and the outer steel pipe 12 are connected by a steel pipe bracket 13, and the inner steel pipe 11 can also be protected by the sacrificial anode unit 4.

[0040] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0041] Those skilled in the art of this technology should understand that the present invention can be implemented in many other specific forms without departing from the spirit and scope of the present invention. Although embodiments of the present invention have been described, it should be understood that the present invention should not be limited to these embodiments. Those skilled in the art of this technology can make changes and modifications within the spirit and scope of the present invention defined by the appended claims.

Claims

1. A steel buried pipeline laying structure, comprising a plurality of pipeline bodies arranged in parallel, characterized in that, At least one of the pipeline bodies is connected with a cathodic protection structure, an equalizing cable is connected between every two adjacent pipeline bodies, two ends of the equalizing cable are electrically connected with the pipeline bodies on the corresponding sides respectively, the cathodic protection structure includes a plurality of sacrificial anode units arranged at intervals in sequence along the axial direction of the pipeline body, and the sacrificial anode units are electrically connected with the pipeline body.

2. The steel buried pipeline laying structure according to claim 1, characterized in that, The connection point of the equalizing cable and the pipeline body provided with the sacrificial anode unit is close to the connection position of the sacrificial anode unit and the pipeline body.

3. The steel buried pipeline laying structure according to claim 1, characterized in that, The equalizing cable is welded to the pipeline body by thermite welding, and the sacrificial anode unit is welded to the pipeline body by thermite welding.

4. The steel buried pipeline laying structure according to claim 1, characterized in that, Insulation layers are provided at the connection between the equalizing cable and the pipeline body and at the connection between the sacrificial anode unit and the pipeline body.

5. The steel buried pipeline laying structure according to claim 1, characterized in that, The sacrificial anode unit includes at least one sacrificial anode assembly, the sacrificial anode assembly includes an anode package, an anode block and an anode cable, the anode block is arranged in the anode package, and the anode block is electrically connected with the pipeline body through the anode cable.

6. The steel buried pipeline laying structure according to claim 5, characterized in that, The distance between the anode block and the pipeline body is not less than 1 m.

7. The steel buried pipeline laying structure according to claim 5, characterized in that, The sacrificial anode unit includes a plurality of sacrificial anode assemblies, connection points of the anode cables and the pipeline body are arranged at intervals in sequence along the axial direction of the pipeline body, and the distance between adjacent connection points is 30-50 mm.

8. The steel buried pipeline laying structure according to claim 5, characterized in that, The anode block is a magnesium anode block or a zinc anode block.

9. The steel buried pipeline laying structure according to claim 1, characterized in that, The pipeline body is of a casing structure and includes an inner steel pipe and an outer steel pipe, the outer steel pipe is sleeved outside the inner steel pipe through a steel pipe support, and the equalizing cable and the sacrificial anode unit are connected to the outer steel pipe.

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