Dike backwater side pressure pipeline laying structure

Abstract

The utility model relates to an embankment backwater side pressure pipeline laying structure which comprises a pressure pipeline buried at the bottom of a groove, a gravel foundation is laid below the pressure pipeline, backfill soil is laid above the pressure pipeline, a seepage pipe is buried at the bottom of the gravel foundation, and the seepage pipe is connected with the backfill soil. Geotechnical cloth is laid on the contact portion of the pressure pipeline and the backfill soil and the contact portion of the backfill soil and the gravel foundation. Seepage damage near the dike downstream side pipe base can be effectively prevented, scouring caused by pressure pipeline breakage and water leakage is reduced, and the possible influence of pipeline engineering on dike safety is reduced.

Description

Technical Field

[0001] This application relates to the fields of water conservancy and municipal engineering, specifically to a pressure pipeline laying structure on the back side of a dike. Background Technology

[0002] Traditional pipeline laying methods follow common municipal engineering practices: excavating trenches and backfilling them with gravel, medium-coarse sand, or crushed stone as the pipeline foundation. After laying the pipeline, high-quality soil is backfilled on both sides and top of the pipeline to ensure foundation stability and the safety of the pipeline structure itself. However, laying pipelines on the backwater side of a dike, especially pressure pipelines with many joints, presents two safety hazards. First, the pipeline foundation uses materials with a high permeability coefficient, increasing the risk of seepage failure at the interface when the water level on the water-facing side of the dike is high. Second, if pressure ruptures and leaks, it can erode the soil around the pipeline, jeopardizing dike safety. Utility Model Content

[0003] The purpose of this application is to provide a pressure pipeline laying structure on the back side of a dike, which effectively prevents seepage damage near the pipe foundation on the back side of the dike, reduces scouring caused by pressure pipeline rupture and leakage, and reduces the potential impact of pipeline engineering on dike safety.

[0004] To achieve the above objectives, this application provides the following technical solution:

[0005] This application provides a pressure pipeline laying structure on the backwater side of a dike, including a pressure pipeline buried at the bottom of a trench, a gravel foundation laid below the pressure pipeline, backfill soil laid above the pressure pipeline, a seepage pipe buried at the bottom of the gravel foundation, and geotextile laid at the contact points between the pressure pipeline and the backfill soil and the contact points between the backfill soil and the gravel foundation.

[0006] Geotextile fabric is also laid on the bottom and sides of the trench.

[0007] The gravel base is laid in two layers. The lower gravel base is in contact with the lowest point of the pressure pipe at its upper edge, and the upper gravel base is laid with pipe armholes on both sides of the center of the pressure pipe.

[0008] The effective support angle α of the pressure pipeline formed by the sand and gravel foundation meets the design requirements.

[0009] The geotextile laid on the side of the trench extends 0.3 meters above the surface of the sand and gravel foundation. The geotextile extending above the surface of the sand and gravel foundation overlaps inward and connects with the geotextile laid at the contact point between the backfill soil and the sand and gravel foundation.

[0010] Compared with the prior art, the beneficial effects of this application are: the construction of this utility model is simple. Compared with traditional trench backfilling, the addition of geotextile filter effectively reduces the amount of mud and sand carried away by water flow. At the same time, the seepage pipe buried in the foundation can promptly drain the water accumulated in the geotextile when the pipeline leaks, maintain the water pressure difference inside and outside the geotextile to be basically the same, keep the trench structure stable after backfilling, and reduce the adverse effects that pipeline construction and operation may have on the dike. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a cross-sectional structural diagram of an embodiment of this application. Detailed Implementation

[0013] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0014] The terms “comprising,” “including,” or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0015] like Figure 1As shown, a pressure pipeline laying structure on the backwater side of a dike includes a pressure pipeline 1 buried at the bottom of a trench. A gravel foundation 4 is laid below the pressure pipeline 1, and backfill soil 3 is laid above the pressure pipeline 1. A seepage pipe 5 is buried at the bottom of the gravel foundation 4. Geotextile 2 is laid at the contact points between the pressure pipeline 1 and the backfill soil 3, and at the contact points between the backfill soil 3 and the gravel foundation 4. Geotextile 2 is also laid at the bottom and sides of the trench. The gravel foundation 4 is laid in two layers. The upper edge of the lower gravel foundation 4 contacts the lowest point of the pressure pipeline 1, and a pipe armhole is laid above the upper gravel foundation 4, extending to both sides of the center of the pressure pipeline 1. The effective support angle α of the pressure pipeline 1 formed by the gravel foundation 4 meets the design requirements. The geotextile 2 laid on the side of the trench extends 0.3 meters above the upper surface of the gravel foundation 4. The geotextile 2 extending above the upper surface of the gravel foundation 4 overlaps inward and connects with the geotextile 2 laid at the contact point between the backfill soil 3 and the gravel foundation 4.

[0016] The implementation process of this application is as follows:

[0017] (1) After excavating the trench for laying the pipe, lay a layer of geotextile on the base of the pipe, which is at least 0.3m higher than the top of the base.

[0018] (2) Backfill the effective support angle α of the pipeline foundation required by the design according to general practice. The material is generally crushed stone, gravel or medium-coarse sand.

[0019] (3) Backfill the pipe base material at the pipe axle angle to both sides of the pipe center, and the backfill slope should be gentler than the angle of repose of the base material.

[0020] (4) Lay another layer of geotextile close to the pipeline and the backfilled foundation, with an overlap of at least 0.3m with the geotextile laid on the foundation.

[0021] (5) Backfill the soil on both sides and top of the pipe according to the usual practice.

[0022] (6) A drainage pipe is buried at regular intervals perpendicular to the pipeline, with the starting point connected to the pipeline foundation and the ending point connected to the nearby drainage ditch for seepage guidance. The starting point of the pipeline is wrapped with a layer of geotextile.

[0023] Compared to traditional trench backfilling, the addition of geotextile filters effectively reduces the amount of sediment carried away by water flow. At the same time, the seepage pipes buried in the foundation can promptly drain water accumulated inside the geotextile when pipeline leakage occurs, maintaining a relatively consistent water pressure difference inside and outside the geotextile, ensuring the stability of the trench structure after backfilling, and reducing the potential adverse effects of pipeline construction and operation on the embankment.

[0024] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A structure for laying pressure pipelines on the backwater side of a dike, characterized in that, The system includes a pressure pipe (1) buried at the bottom of the trench, a gravel foundation (4) laid below the pressure pipe (1), backfill soil (3) laid above the pressure pipe (1), a seepage pipe (5) buried at the bottom of the gravel foundation (4), and geotextile (2) laid at the contact points between the pressure pipe (1) and the backfill soil (3) and between the backfill soil (3) and the gravel foundation (4).

2. The structure for laying a pressure pipeline on the back side of a dike according to claim 1, characterized in that, Geotextile (2) is also laid on the bottom and sides of the trench.

3. The structure for laying a pressure pipeline on the back side of a dike according to claim 1, characterized in that, The gravel foundation (4) is laid in two layers. The upper edge of the lower gravel foundation (4) contacts the lowest point of the pressure pipe (1), and the upper gravel foundation (4) is laid with pipe armpits on the top. The pipe armpits are laid to the center of the pressure pipe (1) on both sides.

4. The structure for laying a pressure pipeline on the back side of a dike according to claim 1, characterized in that, The effective support angle α of the pressure pipeline (1) formed by the laying of the sand and gravel foundation (4) meets the design requirements.

5. The structure for laying a pressure pipeline on the back side of a dike according to claim 2, characterized in that, The geotextile (2) laid on the side of the trench is 0.3 meters higher than the upper surface of the gravel foundation (4). The geotextile (2) that is higher than the upper surface of the gravel foundation (4) overlaps inward and connects with the geotextile (2) laid at the contact part of the backfill soil (3) and the gravel foundation (4).

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