Combined supporting and retaining structure for high fill slope of transformer substation

Abstract

The utility model discloses a transformer substation high fill side slope combined retaining structure, including the slope body and the benching structure, the counterpressure platform structure and the stake board type retaining wall structure that form in the slope surface place from top to bottom at the slope body, the benching structure is arranged on the upper portion of slope surface and is formed through compacted fill, the counterpressure platform structure is arranged in the lower portion of slope surface and is formed through the reinforced earth, the stake board type retaining wall structure is arranged in the lower portion of slope surface and is arranged and is formed through the punching pile. Adopting the combined retaining structure of "bench + reinforced earth counterpressure platform + stake board type retaining wall", utilize the wide reinforced earth counterpressure platform of lower portion to reduce the gravity center of side slope, resist deep sliding together by stake board type retaining wall and reinforced earth, upper benching structure, further reduce the soil body slide force, can effectively reduce the gravity center of fill slope body, improve the performance of resisting deep sliding, reduce the soil body slide force, be favorable to maintaining side slope stability, control slope body deformation and settlement, guarantee the safe operation of transformer substation.

Description

Technical Field

[0001] This utility model relates to the field of power grid engineering construction technology, specifically to a combined retaining structure for high embankment slopes of substations. Background Technology

[0002] Power grid construction often takes place in remote mountainous areas, and the construction projects often involve deep excavation and high filling. A large proportion of these projects involve high fill slopes, which are prone to collapse and landslides during construction and operation. This seriously affects the construction and service level of the power grid and causes incalculable economic losses to the region.

[0003] Currently, in the planning, site selection, construction, and operation of substations in power grid projects, high embankment slope support engineering has become a key factor restricting project site selection, construction progress, investment, and safe operation. Scientific research on combined support technology for high embankment slope engineering can ensure slope deformation stability and has considerable economic and significant social benefits.

[0004] Currently, in many high-fill slope retaining projects for building construction and power grid development, a single slope retaining structure is commonly used. However, single retaining structures have poor flexibility and adaptability, and their application in high-fill slope projects can easily lead to drawbacks such as excessive land use, high project costs, and significant construction difficulties. Therefore, further improvements are warranted. Utility Model Content

[0005] In order to overcome the shortcomings of the existing technology, this utility model provides a combined retaining structure for high embankment slopes of substations to solve the problems in the existing technology.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A combined retaining structure for a high embankment slope of a substation includes a slope body and, from top to bottom, a slope protection structure, a counterweight platform structure, and a pile-slab retaining wall structure formed on the slope surface. The slope protection structure is located on the upper part of the slope surface and is formed by compacted backfill. The counterweight platform structure is located on the middle and lower part of the slope surface and is formed by reinforced soil. The pile-slab retaining wall structure is located on the lower part of the slope surface and is formed by arranged bored piles.

[0008] By adopting the above technical solution, a combined retaining structure of "slope protection + reinforced soil counterpressure platform + pile-slab retaining wall" is used. The large reinforced soil counterpressure platform in the middle and lower part lowers the center of gravity of the slope. The pile-slab retaining wall and reinforced soil jointly resist deep sliding. The slope protection structure in the upper part further reduces the soil sliding force. This effectively lowers the center of gravity of the fill slope, improves the performance of resisting deep sliding, and reduces the soil sliding force. It is conducive to maintaining slope stability, controlling slope deformation and settlement, and ensuring the safe operation of the substation.

[0009] Optionally, the slope of the slope structure is 1:1.8-1:2.2.

[0010] By adopting the above technical solution, the slope of the slope structure is set to 1:1.8-1:2.2, which is relatively gentle and can effectively reduce the sliding force of the soil.

[0011] Optionally, the slope of the slope structure is a multi-stage structure. At the bottom of each stage, a platform drainage ditch is provided. At the bottom of each stage, a gravel drainage layer is formed. The gravel drainage layer is laid horizontally from the inside to the outside of the slope and is located above the platform drainage ditch.

[0012] By adopting the above technical solution, during rainfall, the multi-tiered structure of the slope allows water on the slope to be diverted in stages to the corresponding drainage ditches on the platforms. Simultaneously, water that infiltrates into the slope structure is diverted outward through the corresponding gravel drainage layer to the drainage ditches on the platforms at each level for further drainage, thereby improving the drainage performance of the slope structure and ensuring the stability of the entire structure.

[0013] Optionally, the slope of the counterpressure platform structure is 1:0.8-1:1.2.

[0014] By adopting the above technical solution, the slope of the counterpressure platform structure is set to 1:0.8-1:1.2, which can significantly widen the counterpressure platform to lower the center of gravity of the slope, thereby ensuring resistance to deep slope sliding and improving the performance of resisting deep sliding.

[0015] Optionally, a crushed stone drainage layer laid from top to bottom is formed at the junction of the counter-pressure platform structure and the slope structure, and a crushed stone drainage layer laid horizontally from the inside to the outside is formed at the bottom of the counter-pressure platform structure, and the two crushed stone drainage layers are connected.

[0016] By adopting the above technical solution, during rainfall, the water that has seeped into the counterpressure platform structure is diverted outward by utilizing the two gravel drainage layers on the back side and bottom of the counterpressure platform structure, thereby improving the drainage performance of the counterpressure platform structure and ensuring the stability of the entire structure.

[0017] Optionally, the slope of the counterpressure platform structure is a multi-step structure, and a platform drainage ditch is provided at the bottom of each step.

[0018] By adopting the above technical solution, during rainfall, the multi-stage structure of the slope of the counterpressure platform allows water on the slope of the counterpressure platform to be graded and diverted to the corresponding drainage ditches of the platform for drainage, thereby further improving its drainage performance.

[0019] Optionally, a slope top intercepting ditch is provided at the top of the slope, and a slope bottom drainage ditch is provided at the bottom of the slope.

[0020] By adopting the above technical solution, the water at the top of the slope and the water at the bottom of the slope are diverted and drained using the intercepting ditch at the top of the slope and the drainage ditch at the bottom of the slope, respectively.

[0021] Compared with existing technologies, the beneficial effects of this utility model are as follows:

[0022] 1. The combined retaining structure of "slope protection + reinforced soil counterpressure platform + pile-slab retaining wall" is adopted. The large reinforced soil counterpressure platform in the middle and lower part lowers the center of gravity of the slope. The pile-slab retaining wall and reinforced soil jointly resist deep sliding. The slope protection structure in the upper part further reduces the soil sliding force. This can effectively lower the center of gravity of the fill slope, improve the performance of resisting deep sliding, reduce the soil sliding force, help maintain slope stability, control slope deformation and settlement, and ensure the safe operation of the substation.

[0023] 2. During rainfall, the multi-tiered structure of the slope allows water to be diverted and discharged in stages to the corresponding drainage ditches on the platforms. Simultaneously, water that infiltrates into the slope is channeled outwards through the corresponding gravel drainage layer to the drainage ditches on the platforms at each level for further treatment. This improves the drainage performance of the slope structure and ensures the stability of the entire structure.

[0024] 3. On the one hand, during rainfall, the two gravel drainage layers on the back side and bottom of the counterpressure platform structure divert water that has seeped into the structure outwards, thereby improving the drainage performance of the counterpressure platform structure and ensuring the stability of the entire structure. On the other hand, during rainfall, the multi-tiered structure of the counterpressure platform structure's slope allows water at the slope to be graded and diverted to the corresponding drainage ditches on the platform, further improving its drainage performance. Attached Figure Description

[0025] Figure 1 This is a cross-sectional structural schematic diagram of a combined retaining structure for a high embankment slope in a substation, as described in this application.

[0026] In the diagram: 1. Slope; 2. Slope structure; 3. Counterpressure platform structure; 4. Pile-slab retaining wall structure; 5. Platform drainage ditch; 6. Crushed stone drainage layer; 7. Slope top intercepting ditch; 8. Slope toe drainage ditch. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0028] like Figure 1 As shown, this utility model provides a combined retaining structure for a high embankment slope of a substation, including a slope body 1 and a slope protection structure 2, a counterweight platform structure 3, and a pile-slab retaining wall structure 4 formed from top to bottom on the slope surface of the slope body 1. The slope protection structure 2 is arranged on the upper part of the slope surface and is formed by compacted soil filling. The counterweight platform structure 3 is arranged in the middle and lower part of the slope surface and is formed by reinforced soil. The pile-slab retaining wall structure 4 is arranged in the lower part of the slope surface and is formed by bored piles.

[0029] In this embodiment, the interior of the reinforced soil counterpressure platform structure 3 uses high-density polyethylene (HDPE) uniaxial geogrid as the reinforcing material, laid vertically at intervals of 0.6m, with a laying length of 15~30m. The pile-slab retaining wall structure 4 is formed by perforation, with pile diameter of 1.8m, center-to-center distance of 3m, average pile length of 20m, and a total of 68 piles.

[0030] In this embodiment, the slope of the slope structure 2 is 1:1.8-1:2.2. Preferably, the slope of the slope structure 2 is 1:2.0, which is relatively gentle and can better reduce the soil sliding force.

[0031] In this embodiment, the slope of the slope structure 2 is a multi-stage structure. At the bottom of each stage, a platform drainage ditch 5 is provided. At the bottom of each stage, a gravel drainage layer 6 is formed. The gravel drainage layer 6 is laid horizontally from the inside to the outside of the slope and is located above the platform drainage ditch 5.

[0032] Specifically, in this embodiment, the total slope height of the slope structure 2 is 20m, and correspondingly, the slope surface of the slope structure 2 is divided into two levels, each level being 10m apart. The thickness of the crushed stone drainage layer 6 is 400mm, and the laying length is 20m.

[0033] During rainfall, the multi-tiered structure of the slope surface of the slope structure 2 allows water to be diverted and discharged in stages to the corresponding platform drainage ditches 5. Simultaneously, water that infiltrates into the slope structure 2 is diverted outward through the corresponding gravel drainage layer 6 to the platform drainage ditches 5 for further drainage, thereby improving the drainage performance of the slope structure 2 and ensuring the stability of the entire structure.

[0034] In this embodiment, a masonry arch frame is laid on the slope surface of the slope structure 2, and grass is sprayed inside the masonry arch frame to form a "natural reinforcing net" on the slope surface using vegetation. This net can firmly hold the soil, prevent soil loss due to rainwater erosion, reduce the probability of soil sliding on the slope surface, and delay or prevent slope collapse and landslide.

[0035] In this embodiment, the slope of the counterweight platform structure 3 is 1:0.8-1:1.2, preferably 1:1.0. This allows for a significant widening of the counterweight platform to lower the slope's center of gravity, thereby ensuring resistance to deep sliding of the slope 1 and improving its resistance to deep sliding.

[0036] In this embodiment, a gravel drainage layer 6 is formed at the junction of the counter-pressure platform structure 3 and the slope structure 2, laid from top to bottom. A gravel drainage layer 6 is also formed at the bottom of the counter-pressure platform structure 3, laid horizontally from the inside to the outside, and the two gravel drainage layers 6 are connected. The slope of the counter-pressure platform structure 3 is a multi-step structure, and a platform drainage ditch 5 is provided at the bottom of each step of the counter-pressure platform structure 3.

[0037] In this embodiment, the crushed stone drainage layer 6 in the counterpressure platform structure 3 is a grid-type crushed stone drainage layer 6 with a thickness of 400mm and is wrapped with geotextile.

[0038] On the one hand, during rainfall, the two gravel drainage layers 6 on the back side and bottom of the counterpressure platform structure 3 are used to divert water that has seeped into the counterpressure platform structure 3 outward, thereby improving the drainage performance of the counterpressure platform structure 3 and ensuring the stability of the entire structure. On the other hand, during rainfall, the multi-stage structure of the slope of the counterpressure platform structure 3 is used to divert water at the slope of the counterpressure platform structure 3 in stages to the corresponding drainage ditches 5 for drainage, thereby further improving its drainage performance.

[0039] In this embodiment, the slope surface of the counterpressure platform structure 3 is covered with grid-wrapped vegetation to form a "natural reinforcing net" on the slope surface. This vegetation can firmly hold the soil, prevent soil loss due to rainwater erosion, reduce the probability of soil sliding on the slope, and delay or prevent slope collapse and landslide.

[0040] In this embodiment, the top surface of the counterpressure platform structure 3 is a slightly sloping surface with a slope of 1%, and a platform drainage ditch 5 is provided on the top surface of the counterpressure platform structure 3 near the sloping side.

[0041] In this embodiment, a slope top intercepting ditch 7 is provided at the top of the slope 1, and a slope foot drainage ditch 8 is provided at the bottom of the slope 1, so as to use the slope top intercepting ditch 7 and the slope foot drainage ditch 8 to divert and drain the water at the top of the slope and the water at the bottom of the slope, respectively.

[0042] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the present invention to the precise forms disclosed, and it is obvious that many changes and variations can be made based on the above teachings. Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. The purpose of selecting and describing exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art, after reading this specification, can make modifications, substitutions, variations, and various choices and changes to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, variations, and choices and changes are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A combined retaining structure for high embankment slopes of substations, characterized in that: It includes a slope (1) and a slope protection structure (2), a counterweight platform structure (3), and a pile-slab retaining wall structure (4) formed from top to bottom on the slope surface of the slope (1); the slope protection structure (2) is arranged on the upper part of the slope surface and is formed by compacted backfill; the counterweight platform structure (3) is arranged on the middle and lower part of the slope surface and is formed by reinforced soil; The pile-slab retaining wall structure (4) is arranged at the lower part of the slope, and the pile-slab retaining wall structure (4) is formed by arranging bored piles.

2. The combined retaining structure for high embankment slopes of a substation according to claim 1, characterized in that: The slope of the slope structure (2) is 1:1.8-1:2.

2.

3. A combined retaining structure for high embankment slopes in substations according to claim 2, characterized in that: The slope of the slope structure (2) is a multi-stage structure. At the bottom of each stage, the slope structure (2) has a platform drainage ditch (5). At the bottom of each stage, the slope structure (2) has a crushed stone drainage layer (6). The crushed stone drainage layer (6) is laid horizontally from the inside to the outside of the slope and is located above the platform drainage ditch (5).

4. The combined retaining structure for high embankment slopes of a substation according to claim 1, characterized in that: The slope of the counterpressure platform structure (3) is 1:0.8-1:1.

2.

5. A combined retaining structure for high embankment slopes of a substation according to claim 4, characterized in that: At the junction of the counter-pressure platform structure (3) and the slope structure (2), a crushed stone drainage layer (6) is formed from top to bottom. At the bottom of the counter-pressure platform structure (3), a crushed stone drainage layer (6) is formed from the inside to the outside, and the two crushed stone drainage layers (6) are connected.

6. A combined retaining structure for high embankment slopes of a substation according to claim 4, characterized in that: The slope of the counterpressure platform structure (3) is a multi-step structure, and a platform drainage ditch (5) is provided at the bottom of each step of the counterpressure platform structure (3).

7. A combined retaining structure for high embankment slopes in substations according to claim 1, characterized in that: A slope top intercepting ditch (7) is provided at the top of the slope (1), and a slope bottom drainage ditch (8) is provided at the bottom of the slope (1).

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