Construction structure of prefabricated substation in cold regions

Abstract

This utility model relates to the construction structure of a prefabricated substation in high-altitude and cold regions. It includes a prefabricated substation with a foundation pit beneath it, and a supporting foundation within the pit. The foundation pit is frustum-shaped, with the upper end larger than the lower end. The supporting foundation includes a steel frame with vertical bottom supports at its lower end, the lower ends of which are inserted into the bottom soil layer of the pit. Inclined supports are provided on the sides of the steel frame, the lower ends of which are inserted into the sidewalls of the pit. This utility model uses a steel frame to support the prefabricated substation. Compared to a concrete foundation, the steel frame has better toughness and seismic resistance. Furthermore, by providing inclined supports on the sides of the steel frame and bottom supports at its bottom, the stability of the entire steel frame can be improved, thereby ensuring the stability and seismic performance of the prefabricated substation. In addition, the steel frame can be prefabricated in batches and then transported to the construction site, shortening the construction period.

Description

Technical Field

[0001] This utility model belongs to the field of substation construction technology, and in particular to a construction structure for a box-type substation in cold regions. Background Technology

[0002] In a high-altitude, frigid region above 4000m, with an average annual temperature below -5℃, concrete pouring cannot be carried out from October to March of the following year due to the high altitude and climate constraints. This results in an effective construction period of less than seven months per year. While prefabricated substations typically use concrete foundations, the low temperatures in these regions prolong the concrete's setting time, reduce its strength and toughness, and lengthen the construction cycle, all of which negatively impact construction quality and efficiency. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a construction structure for prefabricated substations in cold regions, which can ensure the construction quality and efficiency of prefabricated substations.

[0004] To solve the above problems, the technical solution adopted by this utility model is: a construction structure for a prefabricated substation in cold regions, including a prefabricated substation, with a foundation pit set below the prefabricated substation and a supporting foundation set inside the foundation pit;

[0005] The foundation pit is truncated pyramidal in shape, with the upper end of the pit being larger than the lower end. The supporting foundation includes a steel frame, with a vertical bottom support column at the lower end of the steel frame, the lower end of which is inserted into the bottom soil layer of the foundation pit. Inclined supports are provided on the sides of the steel frame, with the lower ends of which are inserted into the sidewall of the foundation pit.

[0006] Furthermore, the upper surface edge of the steel frame is provided with multiple vertical connecting plates, the box-type substation is supported by the steel frame, and the bottom of the side wall of the box-type substation is fixedly connected to the connecting plates.

[0007] Furthermore, a backfill layer is provided inside the foundation pit.

[0008] Furthermore, the backfill layer is a granular layer, and multiple inclined drainage pipes are provided at the bottom edge of the foundation pit.

[0009] Furthermore, the inclined support includes a lower positioning rod and an upper sliding sleeve. The lower end of the lower positioning rod is set as a pointed tip, the upper sliding sleeve is sleeved on the outside of the lower positioning rod and is in clearance fit with the lower positioning rod, and the upper end of the upper sliding sleeve is connected to the steel frame.

[0010] Furthermore, the steel frame includes a horizontal top frame, a horizontal bottom frame, and multiple vertical frames disposed on the lower surface of the top frame.

[0011] Furthermore, the top frame is connected to the vertical frame by screws.

[0012] The beneficial effects of this utility model are: 1. This utility model uses a steel frame to support the box-type substation. Compared with the concrete foundation, the steel frame has better toughness and seismic performance. In addition, by setting inclined columns on the side of the steel frame and bottom columns at the bottom of the steel frame, the stability of the entire steel frame can be improved, thereby ensuring the stability and seismic performance of the box-type substation.

[0013] 2. The steel frame is lightweight and easy to transport. It can be prefabricated in batches and then transported to the construction site, which shortens the construction cycle and improves construction efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall front view and cross-section of this utility model;

[0015] Figure 2 This is a cross-sectional schematic diagram of the inclined support column of this utility model;

[0016] Figure 3 This is a front view schematic diagram of the vertical frame of this utility model;

[0017] Figure 4 This is a top view of the top structure of this utility model;

[0018] Attached reference numerals: 1—Prefabricated substation; 2—Steel frame; 21—Top frame; 22—Vertical frame; 23—Bottom frame; 3—Bottom support; 4—Inclined support; 41—Lower positioning rod; 42—Upper sliding sleeve; 43—Point; 5—Connecting plate; 6—Backfill layer; 7—Drainage pipe. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] This utility model relates to a prefabricated substation construction structure for high-altitude and cold regions, such as... Figure 1 As shown, the substation includes a prefabricated substation 1, which can be any existing substation. A foundation pit is provided below the prefabricated substation 1, and a supporting foundation is provided in the foundation pit to support and fix the prefabricated substation 1.

[0021] Since the prefabricated substation 1 is typically rectangular, and traditional foundation pits are also usually rectangular, in this invention, to improve the stability of the supporting foundation, the foundation pit is designed as a frustum shape, with the upper end of the pit being larger than the lower end. The supporting foundation includes a steel frame 2, which is a frame structure assembled from steel profiles. The steel profiles can be conventional materials such as angle steel, channel steel, rectangular steel, I-beams, and steel plates, which are welded together to form the steel frame 2. To improve corrosion resistance, anti-corrosion paint can be sprayed onto the surface of the steel profiles. A vertical bottom support column 3 is provided at the lower end of the steel frame 2, with the lower end of the bottom support column 3 inserted into the bottom soil layer of the foundation pit. Diagonal supports 4 are provided on the sides of the steel frame 2, with the lower end of the diagonal supports 4 inserted into the side wall of the foundation pit. There are multiple diagonal supports 4, with multiple diagonal supports 4 provided on each side of the steel frame 2. The bottom support column 3 and the diagonal supports 4 serve to reinforce the steel frame 2, ensuring its stability.

[0022] During construction, a frustum-shaped foundation pit is first excavated, and the bottom of the pit is leveled and compacted. Then, each inclined support 4 is driven into the sidewall of the pit, perpendicular to the sidewall. Each bottom support 3 is then driven into the soil at the bottom of the pit, with its upper end flush with the bottom surface. Next, the steel frame 2 is placed into the pit and connected to the bottom supports 3 by welding or bolting. At this point, the bottom of the pit and the bottom supports 3 jointly support the steel frame 2. Then, the upper ends of the inclined supports 4 are connected to the steel frame 2. Finally, the prefabricated substation 1 is moved onto the steel frame 2, and its outer shell is connected to the steel frame 2 by welding or bolting.

[0023] This utility model uses a steel frame 2 to support the box-type substation 1. Compared with the traditional concrete foundation, the steel frame 2 has better toughness and seismic performance. In addition, since there is no need to pour concrete, and the steel frame 2 is lighter and easier to transport, the steel frame 2 can be prefabricated in batches and then transported to the construction site, which helps to shorten the construction cycle and improve construction efficiency.

[0024] To improve the stability of the positioning of the prefabricated substation 1, multiple vertical connecting plates 5 are provided on the upper edge of the steel frame 2. The prefabricated substation 1 is supported by the steel frame 2, and the bottom of the side wall of the prefabricated substation 1 is fixedly connected to the connecting plates 5. After the prefabricated substation 1 is moved onto the steel frame 2, the inner side wall of the connecting plate 5 fits against the outer side wall of the prefabricated substation 1, thereby better positioning the prefabricated substation 1. The prefabricated substation 1 is simultaneously connected to both the steel frame 2 and the connecting plates 5, improving the connection strength.

[0025] In this invention, a backfill layer 6 is provided inside the foundation pit. The backfill layer 6 can be the soil excavated during the foundation pit excavation. As a preferred embodiment, the backfill layer 6 is a granular layer, which can be materials such as fine sand and gravel. The granular layer has pores between its particles, resulting in good drainage. When rainwater or other external water enters the foundation pit, it can quickly flow into the soil layer below, preventing water accumulation in the foundation pit. To further improve the drainage effect, multiple inclined drainage pipes 7 are provided at the bottom edge of the foundation pit. Water flowing to the bottom of the foundation pit can be discharged into the surrounding soil layer through the drainage pipes 7, preventing the soil layer below the foundation pit from softening due to increased water content.

[0026] The inclined support 4 can be a single integral member. However, when using an integral member, during construction, after the inclined support 4 is driven into the side wall of the foundation pit, it is difficult for the upper end of the inclined support 4 to just touch the side of the steel frame 2, making it difficult to fix the upper end of the inclined support 4 to the steel frame 2. To facilitate the fixing of the inclined support 4 to the steel frame 2, the inclined support 4 includes a lower positioning rod 41 and an upper sliding sleeve 42. The lower end of the lower positioning rod 41 is set as a pointed tip 43, and the upper sliding sleeve 42 is fitted over the lower positioning rod 41 with a clearance fit, and the upper end of the upper sliding sleeve 42 is connected to the steel frame 2. The lower positioning rod 41 can be a circular member, and the upper sliding sleeve 42 can be a circular sleeve. During construction, the lower positioning rod 41 is driven into the side wall of the foundation pit, and then the steel frame 2 is placed into the pit. Due to the clearance fit between the upper sliding sleeve 42 and the lower positioning rod 41, the upper sliding sleeve 42 can slide along the lower positioning rod 41, pulling the upper sliding sleeve 42 upward until the upper end of the upper sliding sleeve 42 contacts the steel frame 2. Then, the upper end of the upper sliding sleeve 42 is welded to the steel frame 2, and then the lower end of the upper sliding sleeve 42 is welded to the lower positioning rod 41, so that the lower positioning rod 41, the upper sliding sleeve 42, and the steel frame 2 are fixedly connected as one unit. The lower end of the lower positioning rod 41 is designed with a pointed tip 43 to reduce driving resistance.

[0027] In this invention, the steel frame 2 includes a horizontal top frame 21, a horizontal bottom frame 23, and multiple vertical frames 22 disposed on the lower surface of the top frame 21. The top frame 21, bottom frame 23, and vertical frames 22 can be prefabricated separately and then transported to the construction site. During construction, the bottom frame 23 is first placed into the foundation pit and connected to the bottom support column 3, then the vertical frames 22 are connected to the bottom frame 23, and finally the top frame 21 is connected to the vertical frames 22.

[0028] In this invention, the top frame 21 is connected to the vertical frame 22 by screws, or by welding. Similarly, the vertical frame 22 can also be connected to the top frame 22 by screws or welding.

[0029] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A construction structure for a prefabricated substation in cold regions, comprising a prefabricated substation (1), wherein a foundation pit is provided below the prefabricated substation (1), and a supporting foundation is provided within the foundation pit; characterized in that: The foundation pit is truncated pyramidal in shape, and the size of the upper end of the foundation pit is larger than that of the lower end; the supporting foundation includes a steel frame (2), and a vertical bottom support (3) is provided at the lower end of the steel frame (2), and the lower end of the bottom support (3) is inserted into the bottom soil layer of the foundation pit; an inclined support (4) is provided on the side of the steel frame (2), and the lower end of the inclined support (4) is inserted into the side wall of the foundation pit.

2. The prefabricated substation construction structure for high-altitude and cold regions as described in claim 1, characterized in that: The upper surface edge of the steel frame (2) is provided with multiple vertical connecting plates (5). The box-type substation (1) is supported by the steel frame (2), and the bottom of the side wall of the box-type substation (1) is fixedly connected to the connecting plates (5).

3. The prefabricated substation construction structure for high-altitude and cold regions as described in claim 1, characterized in that: A backfill layer (6) is provided inside the foundation pit.

4. The prefabricated substation construction structure for high-altitude and cold regions as described in claim 3, characterized in that: The backfill layer (6) is a granular layer, and multiple inclined drainage pipes (7) are provided at the bottom edge of the foundation pit.

5. The prefabricated substation construction structure for high-altitude and cold regions as described in claim 1, characterized in that: The inclined support (4) includes a lower positioning rod (41) and an upper sliding sleeve (42). The lower end of the lower positioning rod (41) is set as a pointed tip (43). The upper sliding sleeve (42) is sleeved on the outside of the lower positioning rod (41) and is in clearance fit with the lower positioning rod (41). The upper end of the upper sliding sleeve (42) is connected to the steel frame (2).

6. The prefabricated substation construction structure for high-altitude and cold regions as described in claim 1, characterized in that: The steel frame (2) includes a horizontal top frame (21), a horizontal bottom frame (23), and a plurality of vertical frames (22) disposed on the lower surface of the top frame (21).

7. The prefabricated substation construction structure for high-altitude and cold regions as described in claim 6, characterized in that: The top frame (21) is connected to the vertical frame (22) by screws.

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