Anti-corrosion structure for embedding steel gas pipeline in wet soil forming area

Abstract

The anti-corrosion structure for burying the steel gas pipeline in the wet soil forming area comprises a plurality of drainage units, and each drainage unit is located below the gas pipeline pre-buried in soil and arranged in the length direction of the gas pipeline. The drainage unit comprises a gutter which is excavated below the gas pipeline; the lower surface of the gutter is an inclined plane, and a drain pipe is mounted at the lowest position point of the lower surface of the gutter and can drain water in the gutter out of the gutter; the multi-layer filter screen plate is fixed on the side wall of the gutter, and the projection area of the multi-layer filter screen plate is equal to the projection area of the gutter when the multi-layer filter screen plate is observed from a top view; the aperture of the multi-layer filter screen plate is smaller than or equal to the diameter of fine-grained soil.

Description

Technical Field

[0001] The utility model belongs to the field of pipeline anti - corrosion, and particularly relates to an anti - corrosion structure for a steel gas pipeline buried in a wet soil area. Background Art

[0002] The degree of corrosion on the outer wall of a steel pipeline is directly related to the soil environment in which the pipeline is buried deep underground. One of the corrosion factors of a steel pipeline is the water content in the soil. As an electrolyte solution, water will cause electrochemical corrosion after contacting the pipeline.

[0003] For the soil in a wet soil area, due to its large water content, the degree of corrosion on the outer wall of the steel pipeline is more obvious compared with other areas. The outer wall coating of the steel pipeline can slow down the corrosion to a certain extent, but no design has been made on the soil water content, and the soil environment where the steel pipeline is located has not been improved. Further changing the soil water content to further improve the anti - corrosion ability of the gas pipeline, this effect still needs to be improved. Summary of the Utility Model

[0004] An anti - corrosion structure for a steel gas pipeline buried in a wet soil area of the utility model can reduce the water content in the soil where the gas pipeline is located and improve the anti - corrosion ability of the gas pipeline.

[0005] An anti - corrosion structure for a steel gas pipeline buried in a wet soil area of the utility model includes a plurality of drainage units. Each drainage unit is located below the gas pipeline buried in the soil, and each drainage unit is arranged along the length direction of the gas pipeline; the drainage unit includes: a water diversion groove dug below the gas pipeline; the lower surface of the water diversion groove is an inclined surface, and a drain pipe is installed at the lowest position point of the lower surface of the water diversion groove, and the drain pipe can drain the water in the water diversion groove out of the water diversion groove; a multi - layer filter screen plate fixed on the side wall of the water diversion groove. When observed from a top view, the projected area of the multi - layer filter screen plate is equal to the projected area of the water diversion groove; the aperture of the multi - layer filter screen plate is less than or equal to the diameter of fine - grained soil.

[0006] Further, the multi - layer filter screen plate includes a first filter screen plate, a second filter screen plate and a third filter screen plate stacked in sequence from top to bottom. The apertures of the first filter screen plate, the second filter screen plate and the third filter screen plate are arranged in decreasing order from large to small; the apertures of the first filter screen plate, the second filter screen plate and the third filter screen plate are all less than the diameter of fine - grained soil. When observed from a top view, the projection of the first filter screen plate is smaller than the projection of the water diversion groove.

[0007] A water diversion block is fixed on the side wall of the water diversion trough. When observed from a top view, assuming the length direction of the gas pipeline is the X direction, and when observed in the X direction, the water diversion block is fixed on the right side surface of the water diversion trough, then the first filter plate is fixed on the left side surface of the water diversion trough; the upper surface of the water diversion block is an inclined surface, the right end of the upper surface of the water diversion block is higher than the first filter plate, and the left end of the upper surface of the water diversion block is flush with the upper surface of the first filter plate.

[0008] The mesh hole diameters of the first filter plate, the second filter plate, and the third filter plate are set in decreasing order from large to small to ensure that fine-grained soil does not enter the water diversion trough. The water diversion block guides the water in the soil above the filter plate to above the first filter plate, ensuring that the water and fine-grained soil must pass through the first filter plate for filtration, ensuring the completeness of the filtration of fine-grained soil and there is no situation where it leaks through a certain filter plate.

[0009] Further, when observed from a top view, assuming the direction perpendicular to the X direction is the Y direction; the slope of the lower surface of the water diversion trough in the X direction is 10%-15%, and the slope in the Y direction is 5%.

[0010] Because the length of the water diversion trough in the X direction is long and the length in the Y direction is short, when designing, the slope of the water diversion trough in the X direction is made greater than that in the Y direction. The advantage of this design is that the flow rate of the water in the water diversion trough in the X direction is faster than that in the Y direction, and the length in the X direction is longer than that in the Y direction. Therefore, overall, the flow direction of the water is more reasonable, ensuring that the water quickly reaches the drain hole.

[0011] Further, when observed from a top view, each drainage unit is arranged at equal intervals along the length direction of the gas pipeline; the interval between the water diversion troughs of two adjacent drainage units is greater than 50 meters and less than 100 meters.

[0012] The interval of the water diversion troughs is designed to be between 50 and 100 meters. When observed from a top view, it can ensure that there is an overlapping same area in the soil areas where the water of two adjacent water diversion troughs is filtered. In this way, it is possible to avoid the existence of areas in the wet soil that have not been drained. Because there is too much water remaining in the areas that have not been drained, it is still easy to corrode the outer wall of the gas pipeline.

[0013] Further, when observed from a top view, the length of the water diversion trough in the X direction is 5 meters, and the length in the Y direction is 3 meters.

[0014] Further, when observed in the X direction, the left end of the first filter plate is flush with the left end of the gas pipeline, and the right end of the first filter plate is flush with the right end of the gas pipeline.

[0015] Viewed from the top view, ensure that the projection of the first filter plate can cover the projection of the gas pipeline. The advantage of doing this is to ensure that there are no dead corners under the gas pipeline, and to ensure that the water in the soil surrounding the gas pipeline can surely pass through the first filter plate. If it is not level, for example, the left end of the gas pipeline is located on the right side of the left end of the first filter plate, then the water on the lower side of the left end of the gas pipeline is not easily directly pass through the first filter plate and enter the water diversion trough. Therefore, the water flow in the soil on the lower side of the left end of the gas pipeline is not smooth, resulting in the water not being able to separate from the gas pipeline faster than the foregoing, and causing a stronger corrosion effect on the gas pipeline. Description of the Drawings

[0016] Figure 1 is the overall view of this structure;

[0017] Figure 2 The cross-sectional view of this structure.

[0018] Figure 3 is the comparison chart of the water content of the original soil and the water diversion trough design at different burial depths.

[0019] 1. Drainage unit; 2. Gas pipeline; 11. Water diversion trough; 12. First filter plate; 13. Second filter plate; 14. Third filter plate; 15. Drainage hole; 16. Water diversion block; 17. Drain pipe; Detailed Implementation Manner

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] Example 1: See Figure 1 , an anti-corrosion structure for burying a steel gas pipeline in a wet soil area, including a plurality of drainage units, each drainage unit is located below the gas pipeline in the wet soil area. In this embodiment, each drainage unit is arranged at equal intervals along the length direction of the gas pipeline.

[0022] The drainage unit includes:

[0023] A water diversion trough, excavated below the gas pipeline, with a trough inner wall made of concrete; in this embodiment, viewed from the top view, let the length direction along the gas pipeline be the X direction, and the direction perpendicular to the X direction be the Y direction. In this embodiment, the length of the water diversion trough along the X direction is 5 m, and the length along the Y direction is 3 m. The distance between two adjacent water diversion troughs is greater than 50 m and less than 100 m. See Figure 2, when viewed along the X direction, the left end of the gas pipeline is flush with the left end of the water diversion trough, and the diameter of the gas pipeline is smaller than the length of the water diversion trough along the Y direction. The lower surface of the water diversion trough is an inclined plane. In a top view, the position at the upper right corner of the lower surface of the water diversion trough has the lowest height. In this embodiment, the slope of the lower surface of the water diversion trough along the X direction is 10%-15%, and the slope along the Y direction is 5%. The water on the lower surface of the water diversion trough can be designed according to this slope and flow naturally to the upper right corner position of the lower surface of the water diversion trough. A drain hole is opened downward at this position point of the water diversion trough.

[0024] The drain pipe is connected and communicated with the drain hole at one end and is connected to the outside of the water diversion trough at the other end and is connected and communicated with the municipal drain pipe. The water entering the water diversion trough can flow naturally from the drain pipe to the outside of the water diversion trough and then be drained by the municipal drain pipe.

[0025] The multi-layer filter plates are stacked on top of each other from top to bottom and are all fixedly installed on the inner wall of the water diversion trough by means of bolts. In this embodiment, there are three layers of filter plates, which are respectively denoted as the first filter plate, the second filter plate, and the third filter plate from top to bottom. In this embodiment, the first filter plate, the second filter plate, and the third filter plate are all plastic plates with holes on the surface, and the pore diameters of the first filter plate, the second filter plate, and the third filter plate are set in descending order. In a top view, the projections of the second filter plate, the third filter plate, and the water diversion trough coincide, and the projection of the first filter plate is smaller than the projection of the water diversion trough. When viewed along the X direction, the left end of the first filter plate is flush with the left end of the water diversion trough, and the length of the first filter plate along the Y direction is greater than or equal to the length of the gas pipeline along the Y direction. In this embodiment, the right end of the first filter plate is flush with the right end of the gas pipeline. In this embodiment, the mesh number of the first filter plate is 200 meshes, the mesh number of the second filter plate is 220 meshes, and the mesh number of the third filter plate is 250 meshes. Since the diameter of fine-grained soil is generally 0.075 mm, and the pore diameter of the 200-mesh first filter plate is 0.074 mm, all the filter plates cannot allow soil to flow through, only the water in the soil can pass through the multi-layer filter plates, and fine-grained soil cannot pass through the multi-layer filter plates. The water passing through the multi-layer filter plates can enter the water diversion trough.

[0026] The water diversion block is made of concrete and is located above the multi-layer filter plates. When viewed along the X direction, the right end of the water diversion block is fixed on the right inner wall of the water diversion trough; the left end of the water diversion block abuts against the right end of the first filter plate; the upper surface of the water diversion block is an inclined plane, that is, the right end of the upper surface of the water diversion block is high and the left end is low, and the upper surface of the left end of the water diversion block is flush with the upper surface of the water diversion block.

[0027] The usage process of this device is as follows:

[0028] Since the gas pipeline is located in a wet soil area, the soil that wraps the gas pipeline is mostly wet soil with a high water content. After the water diversion trough is excavated, a water pressure difference will be generated between the water head in the soil above the water diversion trough and the water diversion trough. At the same time, the water in the soil also has gravitational potential energy. Under the combined effect of the two, the water in the soil will flow to the water diversion trough. The water enters the water diversion trough through the multi-layer filter plate and is discharged from the water diversion trough to the municipal pipeline.

[0029] The water diversion block can allow water to flow to the water diversion trough after passing through the multi-layer filter plates, so that fine-grained soil will not flow to the water diversion trough, thus avoiding the loss of fine-grained soil.

[0030] Example 2: See Figure 3 In order to prove that the design of digging a water diversion trough under the gas pipeline in Example 1 can reduce the water content in the soil, soil moisture sensors are pre-buried at different depths at 3m near the gas pipeline to represent the water content at different depths of the soil after the water diversion trough structure in Example 1 is adopted. And soil moisture sensors are pre-buried at different depths at a distance of 30m from the gas pipeline at the same depth as above to indirectly represent the original water content in the soil.

[0031] The data collected by the soil moisture sensor in the two cases were fitted using software. The relationship between the fitted burial depth and soil moisture content is shown in Figure 3 .

[0032] Figure 3 In the figure, the red line indicates the soil moisture content at different burial depths with the water diversion channel design; the black line indicates the soil moisture content at different burial depths of the original soil. Figure 3 It can be seen from the figure that the water content of the soil at different burial depths has decreased by adopting the water diversion trough design, especially under the gas pipeline, where the soil water content has dropped sharply, which has a significant effect on soil drainage and can indirectly prevent corrosion of the gas pipeline.

[0033] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An anti-corrosion structure for steel gas pipelines buried in wet soil areas, characterized in that It includes a plurality of drainage units, each drainage unit is located below the gas pipeline embedded in the soil, and each drainage unit is arranged along the length direction of the gas pipeline; The drainage unit includes: A water diversion trough, excavated below the gas pipeline; the lower surface of the water diversion trough is an inclined plane, and a drain pipe is installed at the lowest position point of the lower surface of the water diversion trough, and the drain pipe can drain the water in the water diversion trough outside the water diversion trough; A plurality of filter plates, fixed on the side wall of the water diversion trough. When observed in a top view, the projected area of the plurality of filter plates is equal to the projected area of the water diversion trough; the aperture of the plurality of filter plates is less than or equal to the diameter of fine-grained soil.

2. The anti-corrosion structure for a steel gas pipeline buried in a wet soil area according to claim 1, characterized in that, The plurality of filter plates include a first filter plate, a second filter plate and a third filter plate stacked in sequence from top to bottom, and the apertures of the first filter plate, the second filter plate and the third filter plate are arranged in descending order; the apertures of the first filter plate, the second filter plate and the third filter plate are all less than the diameter of fine-grained soil. When observed in a top view, the projection of the first filter plate is smaller than the projection of the water diversion trough; A water diversion block is fixed on the side wall of the water diversion trough. When observed in a top view, assuming the length direction of the gas pipeline is the X direction, and when observed in the X direction, assuming the water diversion block is fixed on the right surface of the water diversion trough, then the first filter plate is fixed on the left surface of the water diversion trough; the upper surface of the water diversion block is an inclined plane, the right end of the upper surface of the water diversion block is higher than the first filter plate, and the left end of the upper surface of the water diversion block is flush with the upper surface of the first filter plate.

3. The anti-corrosion structure for burying a steel gas pipeline in a wet soil area according to claim 2, wherein When observed in a top view, assuming the direction perpendicular to the X direction is the Y direction; the slope of the lower surface of the water diversion trough along the X direction is 10%-15%, and the slope along the Y direction is 5%.

4. The anti-corrosion structure for a steel gas pipeline buried in a wet soil area according to claim 3, characterized in that, When observed in a top view, each drainage unit is arranged at equal intervals along the length direction of the gas pipeline; the interval between the water diversion troughs of two adjacent drainage units is greater than 50 meters and less than 100 meters.

5. The anti-corrosion structure for a steel gas pipeline buried in a wet soil area according to claim 4, characterized in that, When observed in a top view, the length of the water diversion trough along the X direction is 5 meters, and the length along the Y direction is 3 meters.

6. The anti-corrosion structure for a steel gas pipeline buried in a wet soil area according to claim 2, characterized in that, When observed in the X direction, the left end of the first filter plate is flush with the left end of the gas pipeline, and the right end of the first filter plate is flush with the right end of the gas pipeline.

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