Filling slope structure of transformer substation

Abstract

The invention discloses a transformer substation fill side slope structure which comprises a foundation and a side slope, and the foundation is arranged at the bottom of the side slope and is a pile-net composite foundation; the pile net composite foundation comprises a pile foundation, a pile cap and a reinforced cushion layer. The slope surface of the side slope is protected by skeleton plants, and the slope corner of the side slope is provided with a corner protector; a hardened area extending to the slope top by a certain distance is arranged at the transition position of the slope surface and the slope top of the side slope. The enclosing wall is arranged on the top of the side slope and is tightly attached to the side, close to the slope top, of the hardened area. After construction of the pile-net composite foundation is finished, backfilling can be carried out in the whole station, and backfilling does not need to be carried out after maintenance of the retaining wall is finished. Compared with a retaining wall, the concrete mass of the pile caps is smaller, construction of all the pile caps does not affect one another, multiple working faces can be carried out at the same time, the construction speed is higher, the construction difficulty is smaller, and the engineering construction period is shortened. According to the side slope and the enclosing wall, the pile-net composite foundation serves as a bearing layer, control by horizontal thrust is avoided, deviation is not prone to occurring, and safety and stability are higher. In addition, the pile-net composite foundation in the station can extend to the bottom of the side slope, and construction of the pile-net composite foundation is more convenient. Especially when the field is uneven, the method can avoid complex interface treatment with the pile-net composite foundation in the station area. By using the same pile-net composite foundation, the connector with the pile-net composite foundation of the station area is simpler.

Description

Technical Field

[0001] This application relates to substation slope structures, and more particularly to a substation embankment slope structure. Background Technology

[0002] When the natural terrain of a substation area is low, it is necessary to raise the area to prevent equipment and buildings from being affected by floods. However, when there is a thick layer of soft soil, filling the area will cause significant settlement, affecting the safe and stable operation of the equipment. Current technology generally uses a pile-net composite foundation to address site settlement. Since the substation site is higher than the surrounding natural terrain, retaining structures are necessary. Retaining walls are typically used as retaining structures. However, when using a pile-net composite foundation to address site settlement, retaining walls have the following disadvantages: (1) The construction period of the retaining wall is long, and the station area can only be backfilled after the retaining wall has been cured to a certain strength, which leads to the slow progress of the project.

[0003] (2) When the free face is high, the horizontal thrust of the backfill on the retaining wall is large and needs to be borne by the pile foundation of the retaining wall. During foundation excavation and station area backfilling, the pile foundation is prone to displacement and tilting due to the poor restraint effect of soft soil on the pile foundation. This results in large horizontal displacement of the retaining wall and the upper wall, affecting the safety of the retaining wall and the upper wall. At the same time, cracking affects the normal use performance of the structure.

[0004] (3) When the site is uneven, the retaining wall needs to be set in sections. Each section has a different burial depth, which increases the difficulty of the construction of the retaining wall. In addition, the interface treatment of the retaining wall and the pile network composite foundation of the station area is complicated.

[0005] Therefore, there is an urgent need for a slope structure in the existing technology to overcome the shortcomings of retaining wall schemes. Summary of the Invention

[0006] The purpose of this application is to provide a slope structure to overcome the shortcomings of retaining wall schemes.

[0007] Specifically, this application discloses a substation fill slope structure, which includes: a foundation, a slope, and a retaining wall, wherein: The foundation is located at the bottom of the slope and is a pile-mesh composite foundation; the pile-mesh composite foundation includes: pile foundation, pile cap and reinforced cushion layer; The slope surface is protected by a framework of vegetation, and the slope angles are equipped with corner guards; a hardened area extending a certain distance to the top of the slope is provided at the transition between the slope surface and the top of the slope. The wall is positioned at the top of the slope, close to the hardened area on the side near the top of the slope.

[0008] In a preferred embodiment, the pile foundation includes: cast-in-place piles, PHC piles, and precast square piles.

[0009] In a preferred embodiment, the reinforced cushion layer further comprises: graded crushed stone and geogrid.

[0010] In a preferred embodiment, the slope ratio of the slope is 1:1.75-1:1.50.

[0011] In a preferred embodiment, the size, height, and reinforcement of the pile cap are configured according to the thickness of the upper backfill and the load it bears.

[0012] In a preferred embodiment, the hardened area is not reinforced with steel bars and is a plain concrete structure.

[0013] In a preferred embodiment, the skeleton plant slope protection structure is formed by a regular hexagonal concrete frame.

[0014] In a preferred embodiment, when there are ditches on the slope terrain, the pile caps of the pile network composite foundation on the ditch side adopt a single-row pile cap structure.

[0015] In a preferred embodiment, the slope structure further includes a retaining plate, which is disposed on the upper part of the single-row pile cap structure as a corner protection for the slope, and a drainage outlet is provided at the retaining plate.

[0016] In a preferred embodiment, the single-row pile cap is connected to the surrounding pile caps by a foundation beam to enhance stability.

[0017] In a preferred embodiment, the drain outlet is equipped with a mesh, a filter bag, and a drain pipe.

[0018] In a preferred embodiment, the drainage pipe has a slope of 10%, a spacing of no more than 2m, and ensures that there is at least one pipe within the ditch area.

[0019] The main advantages of this invention are: (1) After the construction of the pile-net composite foundation of the present invention is completed, backfilling can be carried out on the entire site without waiting for the retaining wall to be cured. Compared with the retaining wall, the concrete volume of the pile cap is smaller, and the construction of each pile cap does not affect each other. Multiple working faces can be carried out at the same time, the construction speed is faster, the construction difficulty is lower, and the construction period is saved.

[0020] (2) The slope and the wall of the present invention are all based on the pile network composite foundation as the bearing layer, which is not controlled by horizontal thrust and is not easy to deviate, thus having higher safety and stability.

[0021] (3) This invention allows the pile-net composite foundation within the station to be extended to the bottom of the slope, making the construction of the pile-net composite foundation more convenient. Especially when the site is uneven, using this invention can avoid the complex interface treatment with the pile-net composite foundation in the station area. This invention simplifies the interface with the pile-net composite foundation in the station area by using the same pile-net composite foundation.

[0022] The specification of this application contains numerous technical features distributed across various technical solutions. Listing all possible combinations of these technical features (i.e., technical solutions) would make the specification excessively lengthy. To avoid this problem, the various technical features disclosed in the above-described invention, the various technical features disclosed in the following embodiments and examples, and the various technical features disclosed in the accompanying drawings can be freely combined to form various new technical solutions (all of which should be considered as described in this specification), unless such a combination of technical features is technically infeasible. For example, one example discloses feature A+B+C, and another example discloses feature A+B+D+E. Features C and D are equivalent technical means that serve the same function, and technically only one needs to be used; they cannot be used simultaneously. Feature E can technically be combined with feature C. Therefore, the solution A+B+C+D should not be considered as described because it is technically infeasible, while the solution A+B+C+E should be considered as described. Attached Figure Description

[0023] Figure 1 This is a layout diagram of a slope pile-net composite foundation according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the overall slope structure according to an embodiment of the present invention; Figure 3 This is a top view of a pile cap according to an embodiment of the present invention; Figure 4 This is a side view of a pile cap according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the slope surface structure of an embankment slope according to an embodiment of the present invention; Figure 6 This is a schematic diagram of a precast concrete frame for slope according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the stirrup structure in a concrete frame according to an embodiment of the present invention. Figure 8 This is a top view of a slope structure with a ditch according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the overall structure of a slope structure with a ditch according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the reinforcement of the foundation cap according to an embodiment of the present invention; Figure 11 This is a schematic diagram of a drainage structure according to an embodiment of the present invention; Figure 12 This is a front view of a single-row pile cap according to an embodiment of the present invention.

[0024] Attached diagram labels: 1-Pile-mesh composite foundation; 2-Pile foundation; 3-Reinforced cushion layer; 4-Slope surface; 5-Wall; 6-Hardened area; 7-Concrete frame; 8-Ditch; 9-Dry land; 10-Retaining board; 11-Drainage outlet; 12-Corner guard; 14-Stirrup; 15-Drainage pipe; 16-Filter pack; 17-Mesh sheet; CT1-Single row pile cap; ZM1-Pile cap; JL1-Foundation beam and slab. Detailed Implementation

[0025] Through meticulous and in-depth research, the inventors have developed a novel substation embankment slope structure for the first time. Compared to existing technologies, the pile-mesh composite foundation of this invention allows for backfilling of the entire substation after construction, eliminating the need to wait for retaining walls to cure. Compared to retaining walls, the concrete volume of the pile caps is smaller, and the construction of each pile cap is independent, allowing for simultaneous work on multiple work surfaces, resulting in faster construction speed, less construction difficulty, and shorter construction time. The slopes and retaining walls of this invention use the pile-mesh composite foundation as the bearing layer, are not controlled by horizontal thrust, are less prone to displacement, and offer higher safety and stability. Furthermore, this invention allows the pile-mesh composite foundation within the substation to extend to the bottom of the slope, making pile-mesh composite foundation construction more convenient. Especially when the site is uneven, this invention avoids the complex interface treatment with the pile-mesh composite foundation in the substation area. The use of the same pile-mesh composite foundation simplifies the interface with the pile-mesh composite foundation in the substation area.

[0026] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the invention, but do not limit the invention in any way. It should be understood that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These modifications and improvements all fall within the scope of protection of the present invention.

[0027] Example 1 Specifically, the first embodiment of the present invention is, for example... Figure 1-7 As shown, this embodiment is mainly applicable to slope structures in dry land, wherein, Figure 1 This is a schematic diagram of the layout of the pile-net composite foundation used in the slope structure of this embodiment. Figure 2The specific slope structure of this embodiment is shown, which includes a pile-net composite foundation 1, a slope surface 4, and a retaining wall 5. The pile-net composite foundation includes pile foundations 2, a reinforced cushion layer 3, and pile caps ZM1, which are arranged at the bottom of the entire slope structure as shown in the figure. From top to bottom, the reinforced cushion layer 3, pile caps ZM1, and pile foundations 2 are arranged in that order. The slope surface 4 uses a framework of vegetation for slope protection, and the slope angle is equipped with corner guards 12. A hardened area 6 extending a certain distance to the top of the slope surface is provided at the transition between the slope surface and the top of the slope for easy walking. The retaining wall 5 is located at the top of the slope, closely attached to the hardened area, and a groove is provided at the top of the slope surface to prevent the retaining wall 5 from being obstructed.

[0028] The structural parameters of the pile cap ZM1 of the pile-net composite foundation 1 used in this embodiment are as follows: Figure 3 and Figure 4 As shown, Figure 4 The diagram also shows a pile foundation 2 connected to a pile cap ZM1 in a pile-net composite foundation 1. In this embodiment, a 2mm thick polyurethane waterproof coating is provided on the top surface of the pile cap ZM1 within a 1.2*1.2mm range.

[0029] In this embodiment, a regular hexagonal concrete frame 7 is used to form the skeleton, and its specific slope structure is as follows: Figure 5 As shown, this is a top view of the slope, illustrating the arrangement of the concrete frame 7 in this embodiment. The specific structure and parameters of the concrete frame 7 are as follows: Figure 6 As shown, it has stirrups on each side of the hexagon, and the structure and parameters of the stirrups are as follows. Figure 7 As shown.

[0030] Example 2 Another embodiment of the invention, for example Figure 8-12 As shown, this embodiment is mainly applicable to slope structures with ditches. The basic slope structure of this embodiment is as follows: Figure 8 and Figure 9 As shown, it includes Figure 8 The dry land 9 and ditch 7 on the left side of the middle section and the slope structure of this embodiment on the right side are shown. In this embodiment, the pile cap ZM1 on the ditch side adopts a single-row pile cap CT1, which plays the role of retaining soil. Since most of the loads of the slope filling, the upper wall, etc. are transferred to the pile cap ZM1 by the reinforced cushion layer 3, and are finally borne by the pile foundation 2, the load borne by the site between the pile caps ZM1 is very small. Therefore, the horizontal thrust generated by the soil pressure borne by the single-row pile cap CT1 is very small, and the single-row pile can meet the requirements. Figure 10 A schematic diagram of the reinforcement of the single-row pile cap CT1 is shown.

[0031] In this embodiment, as Figure 9As shown, a retaining plate 10 is configured on the upper part of the single-row pile cap CT1 as a corner protection in this embodiment, and a drainage outlet 11 is configured at the retaining plate 10 to promptly drain water accumulated in the slope and ensure the stability of the slope. The drainage outlet 11 contains, as shown in the diagram... Figure 11 The configuration shown includes a drain pipe 15, a filter bag 16, and a mesh 17. The mesh is made of stainless steel with a mesh size no larger than 15 mm. The filter bag has three layers: 20 mm coarse gravel or crushed stone, 1-4 mm sand or stone chips, and 300-400 g / m³ high-density polyethylene (HDPE) particles. 2 The geotextile is used, and the drainage pipe is a 100 PVC drainage pipe. Its overall front view is as follows. Figure 12 As shown.

[0032] Optionally, in one embodiment, the drainage pipe has a slope of 10%, a spacing of no more than 2m, and it is necessary to ensure that there is no less than one pipe within the ditch area.

[0033] Optionally, in one embodiment, when the height difference between the two sides of the single-row pile cap CT1 is large, the horizontal thrust generated by the earth pressure on the single-row pile cap CT1 increases. In this case, the single-row pile cap CT1 can be connected to the surrounding pile caps ZM1 using a foundation beam JL1, allowing multiple rows of piles to jointly bear the horizontal force generated by the earth pressure, thus increasing the stability of the slope foundation. The specific connection method is as follows: Figure 9 As shown.

[0034] Furthermore, it should be noted that in this patent application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover 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 limitations, 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. In this patent application, if it refers to performing an action according to a certain element, it means performing the action at least according to that element, including two cases: performing the action only according to that element, and performing the action according to that element and other elements. Expressions such as "multiple," "repeatedly," and "various" include two, two times, two kinds, and more than two, more than two times, and more than two kinds.

Claims

1. A substation fill slope structure, characterized by, The slope structure comprises a foundation and a slope, wherein: The foundation is arranged at the bottom of the slope and is a pile-net composite foundation, the pile-net composite foundation comprises a pile foundation, a pile cap and a reinforced cushion; The slope surface comprises a skeleton plant protection slope and a vegetation protection slope, the slope angle is provided with a corner protection, and the transition between the slope surface and the top of the slope is provided with a hardened area extending to a certain distance from the top of the slope.

2. The slope structure according to claim 1, characterized in that, The pile foundation comprises a cast-in-place pile, a PHC pile and a prefabricated square pile.

3. The slope structure according to claim 1, wherein The reinforced cushion further comprises graded gravel, sand, geotextile and geogrid.

4. The slope structure according to claim 1, wherein The slope ratio is 1:1.75~1:1.

50.

5. The slope structure according to claim 1, wherein The size, height and reinforcement of the pile cap are configured according to the upper fill thickness and the load to be borne.

6. The slope structure according to claim 1, wherein The hardened area structure comprises a concrete structure with internal reinforcement and a plain concrete structure without internal reinforcement.

7. The slope structure according to claim 1, wherein The skeleton plant protection slope structure can adopt a concrete frame with a regular hexagon, square or diamond shape to form a skeleton.

8. The slope structure according to claim 1, wherein When there is a ditch in the slope terrain, the pile cap of the pile-net composite foundation at the ditch is provided with a single-row pile cap structure.

9. The slope structure according to claim 8, wherein The slope structure further comprises a retaining plate, the retaining plate is arranged on the upper part of the single-row pile cap structure as a corner protection of the slope, and the retaining plate is provided with a water outlet.

10. The slope structure according to claim 8, wherein The single-row pile cap and the surrounding pile caps are connected by a foundation beam to enhance stability.

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