Construction method for reducing earth pressure on top of deep buried pipeline in mountainous terrain

Abstract

This invention relates to a construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain, comprising the following steps: S100: forming a partial backfill area by layering sand and gravel at the bottom of a valley in the mountainous terrain; S200: forming a trench in the middle of the partial backfill area, and laying a precast culvert in the trench; S300: after the culvert is laid, filling the trench with backfill soil up to the top of the partial backfill area; S400: continuing to fill with backfill soil above the partial backfill area up to the designed ground level. Compared with the prior art, this invention provides a construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain. Through certain construction procedures and by controlling the trench size and varying the soil density on both sides and the top of the culvert, differential soil settlement is utilized to allow the soil on both sides of the culvert to support the soil in the middle of the top, thereby reducing the vertical pressure of the top soil on the culvert.

Description

Technical Field

[0001] This invention belongs to the field of drainage pipe and culvert technology, specifically relating to a construction method for reducing the soil pressure on the top of deeply buried pipes in mountainous terrain. Background Technology

[0002] In mountainous terrain, deep excavation and high filling are common practices, especially where natural drainage channels exist in the original terrain. After backfilling, maintaining unobstructed drainage requires burying culverts along these natural drainage channels. These locations are typically in valleys, with a significant elevation difference between the original ground level and the design ground level. The backfill thickness is approximately 10-15 meters. Directly laying culverts before backfilling would subject the top of the culverts to additional earth pressure from the actual backfill thickness and relative settlement. While excavating trenches from the original ground level to bury the culverts allows the original soil to provide support, it increases the backfill thickness above the culverts and alters the natural drainage elevation, significantly increasing construction difficulty. Both methods result in culverts subjected to greater stress, thicker walls, and a larger amount of reinforcing steel.

[0003] In view of this, the present invention is hereby proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method that reduces the soil pressure on the top of deeply buried pipelines in mountainous terrain, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain includes the following steps:

[0007] S100: In mountainous terrain, sand and gravel are used to backfill the valley floor in layers to form a partial backfill area;

[0008] S200: A trench is formed in the middle of a partial backfill area, and a precast culvert is laid in the trench;

[0009] S300: After the culvert is laid, backfill soil is filled into the trench until the top of the backfill area is partially filled.

[0010] S400: Continue backfilling above the partially backfilled area until the designed ground level is reached.

[0011] In step S100:

[0012] The height of some backfill areas is 2 to 3 times the diameter of the culvert.

[0013] In step S200:

[0014] The width of the slot is the diameter of the culvert D + (500mm~700mm).

[0015] In step S300:

[0016] The compaction coefficient of the backfill soil inside the trench is less than that of the backfill soil on both sides of the trench.

[0017] In step S400:

[0018] The compaction coefficient of the backfill soil above the backfill area is less than that of the backfill soil inside the trench.

[0019] The compaction coefficient of the backfill soil in the partial backfill area shall not be less than 0.98;

[0020] The compaction coefficient of the backfill soil in the trench is 0.95~0.96;

[0021] The compaction coefficient of the backfill soil above the partial backfill area is 0.94~0.95.

[0022] Compared with the prior art, the present invention provides a construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain. Through certain construction procedures and by controlling the size of the foundation trench and varying the compaction of the soil on both sides and the top of the culvert, the differential settlement of the soil is utilized to make the soil on both sides of the culvert support the soil in the middle of the top, thereby reducing the vertical pressure of the top soil on the culvert.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the bottom backfilling in a construction method for reducing the soil pressure on the top of a deeply buried pipeline in mountainous terrain, as provided in an embodiment of the present invention.

[0026] Figure 2 This is a schematic diagram of culvert laying in a construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain, as provided in an embodiment of the present invention.

[0027] Figure 3 This is a schematic diagram of trench backfilling in a construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain, as provided in an embodiment of the present invention.

[0028] Figure 4This is a schematic diagram of backfilling above a trench in a construction method for reducing the soil pressure on the top of a deeply buried pipeline in mountainous terrain, as provided in an embodiment of the present invention.

[0029] Figure 5 This is a flowchart illustrating the prior art of laying culverts directly on the original ground surface and backfilling.

[0030] Figure 6 This is a flowchart illustrating the excavation of trenches on the original ground surface in the prior art of this invention.

[0031] The diagram is shown below:

[0032] 1. Original ground level line; 2. Designed ground level line; 3. Original topographic line of the mountainous area; 4. Partial backfill area; 5. Trench; 6. Culvert; 7. Overhead backfill area.

[0033] H1 is the height from the designed ground line to the original ground line.

[0034] H represents the height of the partial backfill area.

[0035] D is the diameter of the culvert. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0037] In mountainous terrain, there is a widespread practice of deep excavation and high filling, especially where there are natural drainage channels in the original terrain. After backfilling, it is necessary to maintain unobstructed drainage, which requires the installation of culverts at the original natural drainage channels. These locations are generally in valleys.

[0038] like Figure 5 As shown, after directly laying the culvert and backfilling, due to the significant elevation difference between the original ground level 1 and the design ground level 2, the top of the culvert will bear additional soil pressure caused by the actual backfill thickness and relative settlement. According to calculations, the backfill pressure of the culvert is approximately (1.1~1.3)×18×(H1-D).

[0039] like Figure 6As shown, culverts can be installed by excavating trenches from the original ground level. Although this allows the original soil to provide support, it increases the thickness of the soil cover above the culvert and changes the natural drainage elevation, making construction much more difficult. According to calculations, the soil pressure on the culvert is approximately (0.9~1.0)×18×(H1+H2-D).

[0040] Therefore, as Figure 1-4 As shown, the present invention provides a construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain, comprising the following steps:

[0041] S100: In the valley bottom of the mountainous terrain, sand and gravel are used for layered backfilling to form a partial backfill area 4; the height of the partial backfill area is 2 to 3 times the diameter of the culvert.

[0042] S200: A trench 5 is formed in the middle of a partially backfilled area, and a precast culvert 6 is laid in the trench; the width of the trench is the diameter of the culvert D + (500mm~700mm). The trench width of D + (500mm~700mm) is chosen because if the trench is too large, it will be difficult for the surrounding soil to provide effective support.

[0043] S300: After the culvert is laid, backfill soil is filled into the trench up to the top of the partial backfill area. The compaction coefficient of the backfill soil in the trench is less than that of the backfill soil on both sides of the trench.

[0044] S400: Continue backfilling above the partially backfilled area until the designed ground level is reached. The compaction coefficient of the backfill above the partially backfilled area is less than that of the backfill within the trench.

[0045] In the aforementioned backfill soil, the compaction coefficient of the backfill soil in the partial backfill area is not less than 0.98; the compaction coefficient of the backfill soil in the trench is 0.95~0.96; and the compaction coefficient of the backfill soil above the partial backfill area is 0.94~0.95.

[0046] In this invention, the compaction coefficient of the backfill soil within the trench is different from and less than that of the soil on both sides, allowing the supporting effect of the soil on both sides to be fully utilized. On the other hand, the compaction coefficient of the backfill soil within the trench is greater than that of the upper backfill soil, preventing excessive uneven settlement of the upper backfill soil. Furthermore, the compaction coefficient of the upper backfill area 7 does not need to be too large, which facilitates shorter construction time, reduced costs, and easier construction. Thus, according to the calculation, the overburden pressure of the culvert is approximately (0.9~1.0) × 18 × (H1-D). This is in contrast to... Figure 5 and Figure 6 Both methods achieve the technical effect of reducing the soil pressure on the top of the culvert, thereby reducing the amount of concrete and steel reinforcement used in the pipe gallery.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0048] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0049] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the scope of protection of the invention. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

Claims

1. A construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain, characterized in that, Includes the following steps: S100: In mountainous terrain, sand and gravel are used to backfill the valley floor in layers to form a partial backfill area; S200: A trench is formed in the middle of a partial backfill area, and a precast culvert is laid in the trench; S300: After the culvert is laid, backfill soil is filled into the trench until the top of the backfill area is partially filled. S400: Continue backfilling above the partially backfilled area until the designed ground level is reached.

2. The construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain according to claim 1, characterized in that, In step S100: The height of some backfill areas is 2 to 3 times the diameter of the culvert.

3. The construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain according to claim 2, characterized in that, In step S200: The width of the slot is the diameter of the culvert D + (500mm~700mm).

4. The construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain according to claim 3, characterized in that, In step S300: The compaction coefficient of the backfill soil inside the trench is less than that of the backfill soil on both sides of the trench.

5. A construction method for reducing the soil pressure on the top of deeply buried pipelines in mountainous terrain, as described in claim 4, is characterized in that... In step S400: The compaction coefficient of the backfill soil above the backfill area is less than that of the backfill soil inside the trench.

6. A construction method for reducing the soil pressure on the top of a deeply buried pipeline in mountainous terrain, as described in claim 5, is characterized in that: The compaction coefficient of the backfill soil in the partial backfill area shall not be less than 0.98; The compaction coefficient of the backfill soil in the trench is 0.95~0.96; The compaction coefficient of the backfill soil above the partial backfill area is 0.94~0.95.

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