Construction method of box transformer foundation

Abstract

The present application relates to the technical field of photovoltaic substation, and specifically discloses a construction method of box-type transformer substation foundation, comprising the following steps: S1, digging a foundation pit for installing the box-type transformer substation foundation; S2, installing multiple support columns on a frame platform; S3, installing an auxiliary support around the frame platform, which can adjust the height of each support column; S4, waiting for the concrete in the foundation pit to complete solidification; and S5, installing the foundation pedestal of the box-type transformer substation platform on the flat surface formed by the multiple support columns. The multiple support columns are installed on the frame platform, and the frame platform is used to uniformly fix the multiple support columns, so that the multiple support columns can be uniformly adjusted in level before the concrete is poured and solidified. The level adjustment uses a level to detect the levelness of the frame platform, and after the adjustment of the auxiliary support is completed, the top of the multiple support columns can be ensured to be at the same height, thereby meeting the installation requirements of the subsequent box-type transformer substation foundation.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic substation technology, specifically to a construction method for a prefabricated substation foundation. Background Technology

[0002] A box-type transformer is an essential piece of equipment in photovoltaic power generation projects. The advantages of establishing photovoltaic power generation projects on plateaus are: 1. Plateau regions have excellent sunlight conditions and abundant sunshine; 2. Plateau regions have a relatively fragile natural environment and low vegetation coverage, resulting in low land utilization rates, which facilitates photovoltaic power generation projects.

[0003] Setting up photovoltaic power generation projects on plateaus also faces the following challenges: When erecting the prefabricated transformers required for photovoltaic substations, it is necessary to first excavate a foundation pit to install the support columns for the transformers, and then install the transformer platform on multiple support columns. However, due to the uneven terrain in plateau areas, it is necessary to ensure that the transformer platform is level before installing the transformer. The structure formed after the installation of multiple support columns and the transformer platform is completed is called the transformer foundation.

[0004] In the current construction process, the multiple support columns of the transformer substation foundation require separate excavation of foundation pits. Therefore, the support columns need to be readjusted for levelness during the pouring process of each foundation pit, resulting in low installation efficiency of the transformer substation foundation. Summary of the Invention

[0005] The purpose of this invention is to provide a construction method for a prefabricated substation foundation to solve the problems in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A construction method for a prefabricated substation foundation includes the following steps: Step S1: Excavate the foundation pit for installing the transformer substation foundation; Step S2: Install multiple support columns on the frame platform, hoist the frame platform, and place the multiple support columns installed on the frame platform into the foundation pit respectively; Step S3: Install auxiliary supports around the frame platform that can adjust the height of each support column. The auxiliary supports are erected on the ground around the foundation pit to fix each support column. Use a level to check the levelness of the frame platform, adjust the height of the auxiliary supports, and after the levelness of the frame platform is adjusted, pour concrete into the foundation pit. Step S4: Wait for the concrete in the foundation pit to solidify, retain the support columns in the foundation pit, remove the frame platform from the support columns, and obtain multiple support columns on the same plane to form a flat surface; Step S5: Install the base of the transformer substation platform onto the flat surface formed by multiple support columns.

[0007] Furthermore, in step S1, the preset installation position of the support column is first measured, a hole is drilled at the preset installation position to excavate the foundation pit, and the foundation pit is cleaned.

[0008] Furthermore, in step S1, a tracked spiral pile driver or a backhoe excavator with a pile head is used to drill holes, and the excavated foundation pit is protected in time to prevent soil collapse.

[0009] Furthermore, in step S3, before pouring concrete into the foundation pit, the waste residue in the foundation pit is removed, and the foundation pit is poured using a funnel, with the part below the ground level of the foundation pit being formed in one go; after the pouring of the part below the ground level of the foundation pit is completed, the part above the ground level is poured using a formwork.

[0010] Furthermore, in step S3, after the concrete pouring is completed, the concrete is cured by sprinkling water.

[0011] Preferably, the auxiliary support includes a first support and a second support respectively installed on the front and rear sides of the frame platform; the first support includes a first horizontal bar and two vertical bars, the first horizontal bar is located at the bottom of the wing plate of the support column and is used to support the support column on the front side of the frame platform, and the two vertical bars are respectively installed at both ends of the first horizontal bar by clamps; the structure of the second support is the same as that of the first support; an adjusting ring is installed at the lower end of the vertical bar, the upper end of the adjusting ring is rotatably connected to the bottom of the vertical bar, and a fixing rod is threadedly connected to the bottom of the adjusting ring, the bottom of the fixing rod abuts the ground, and the overall height of the vertical bar and the fixing rod is adjusted by rotating the adjusting ring.

[0012] Furthermore, it also includes at least one second horizontal bar, the two ends of which are fixed to the first bracket and the second bracket respectively by clamps.

[0013] Furthermore, the wing plate at the top of the support column protrudes on both the front and rear sides. There are two first brackets, and the first horizontal bars of the two first brackets are respectively located at the bottom of the front and rear wing plates of the front support column. It also includes a short pipe, the two ends of which are connected to the two first brackets by clamps. There are two second brackets, and the first horizontal bars of the two second brackets are respectively located at the bottom of the front and rear wing plates of the rear support column. The two second brackets are connected by another short pipe through clamps.

[0014] Furthermore, a support plate is snapped onto the bottom of the fixing rod; there are multiple support plates, including horizontal support plates and support plates with different inclination angles, and one support plate is selected to snap onto the bottom of the fixing rod to abut against the ground.

[0015] Furthermore, a bolt is installed on the bottom side of the adjusting ring, with one end of the bolt facing the fixing rod. The fixing rod can be tightened or loosened by rotating the bolt.

[0016] Compared with the prior art, the present invention has the following advantages and beneficial effects: This invention mounts multiple support columns on a frame platform, using the platform for unified fixation. This allows for simultaneous leveling of the columns before the concrete pouring and solidifying. Leveling is achieved by using a level to check the platform's level and adjusting auxiliary supports to ensure the tops of all support columns are at the same height, thus meeting the installation requirements of the subsequent transformer substation foundation. This invention eliminates the need for individual adjustment and comparison of each support column, improving installation efficiency and consequently, the overall efficiency of the transformer substation foundation installation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structural state in step S2 of the present invention.

[0018] Figure 2 This is a schematic diagram of the structural state in step S3 of the present invention.

[0019] Figure 3 This is a schematic diagram of the structural state in step S4 of the present invention.

[0020] Figure 4 This is a front view of the first support.

[0021] Figure 5 This is a cross-sectional view of the adjusting ring.

[0022] The meanings of the labels in the diagram are as follows: 1-Frame platform, 2-Support column, 3-Wing plate, 4-First horizontal bar, 5-Vertical bar, 6-Clamp, 7-Adjusting ring, 71-Bolt, 8-Fixing rod, 9-Support plate, 10-Second horizontal bar, 11-Short pipe. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, so as to provide a better understanding of the concept of the present invention, the technical problem solved, the technical features constituting the technical solution, and the technical effects brought about.

[0024] like Figure 1 , Figure 2 , Figure 3 As shown, a construction method for a transformer substation foundation includes the following steps: Step S1: Excavate the foundation pit for installing the transformer substation foundation; the standard dimensions of the foundation pit are a diameter of 0.25 to 0.3 m and a depth of 2 to 3 m.

[0025] Step S2: Install multiple support columns 2 on the frame platform 1, hoist the frame platform 1, and place the multiple support columns 2 installed on the frame platform 1 into the foundation pit respectively; the support columns 2 and the frame platform 1 use customized templates to ensure that the frame platform 1 is tightly and firmly assembled.

[0026] Step S3: Install auxiliary supports around the frame platform 1 to adjust the height of each support column 2. The auxiliary supports are erected on the ground around the foundation pit to fix each support column 2. Use a level to check the levelness of the frame platform 1, adjust the height of the auxiliary supports, and after the levelness of the frame platform is adjusted, pour concrete into the foundation pit. Step S4: Wait for the concrete in the foundation pit to solidify, retain the support column 2 in the foundation pit, remove the frame platform 1 from the support column 2, and obtain multiple support columns 2 on the same plane to form a flat surface; Step S5: Install the foundation pedestal of the transformer substation platform onto the flat surface formed by multiple support columns 2. The foundation pedestal of the transformer substation platform is a flat support platform (usually a metal structure, which facilitates the connection between the support columns 2 and the support platform by bolts) set at the bottom of the transformer substation platform.

[0027] Furthermore, in step S1, the preset installation position of the support column 2 is first measured, a hole is drilled at the preset installation position to excavate the foundation pit, and the foundation pit is cleaned.

[0028] Furthermore, in step S1, a tracked spiral pile driver or a backhoe excavator with a pile head is used to drill holes, and the excavated foundation pit is protected in time to prevent soil collapse.

[0029] Furthermore, in step S3, before pouring concrete into the foundation pit, the waste residue in the foundation pit is removed, and the foundation pit is poured using a funnel, with the part below the ground level being formed in one go; after the pouring of the part below the ground level is completed, and the pouring of the part below the ground level reaches a certain age, the unqualified concrete is chiseled off and washed, and after confirming that it is qualified, the part above the ground level is poured using a formwork.

[0030] Furthermore, in step S3, after the concrete pouring is completed, the concrete is sprayed with water for curing to keep the concrete surface moist.

[0031] This invention utilizes a frame platform 1 to uniformly fix multiple support columns 2, allowing for unified height adjustment of the support columns 2 before concrete pouring. Height adjustment is achieved by using a level to check the levelness of the frame platform 1. Once the levelness is adjusted, it ensures that the tops of the multiple support columns 2 are at the same height, thus meeting the subsequent installation requirements of the transformer substation foundation. This invention eliminates the need for individual adjustment and comparison of the multiple support columns 2, improving the installation efficiency of the support columns 2.

[0032] like Figure 1 and Figure 4 As shown, the frame platform 1 has multiple support columns 2 at its bottom, and the upper end of the support column 2 is provided with a wing plate 3. The auxiliary support includes a first support and a second support installed on the front and rear sides of the frame platform 1, respectively. The first support includes a first horizontal bar 4 and two vertical bars 5. The first horizontal bar 4 is located at the bottom of the wing plate 3 of the support column 2 and is used to support the support column 2 on the front side of the frame platform 1. The two vertical bars 5 are respectively installed at both ends of the first horizontal bar 4 by clamps 6. The structure of the second support is the same as that of the first support. An adjusting ring 7 is installed at the lower end of the vertical bar 5. The upper end of the adjusting ring 7 is rotatably connected to the bottom of the vertical bar 5. The bottom of the adjusting ring 7 is threadedly connected to a fixing rod 8. The bottom of the fixing rod 8 abuts against the ground. The overall height of the vertical bar 5 and the fixing rod 8 can be adjusted by rotating the adjusting ring 7.

[0033] Auxiliary supports are used in the pouring stage of the transformer substation foundation. The transformer substation foundation itself includes a platform frame 1 and support columns 2 at the four corners of the bottom of the platform frame 1. Usually, support columns 2 at the four corners are sufficient. In practical applications, transformer substation foundations with six support columns 2 are often selected. Figure 1 The bottom of support column 2 in the transformer substation foundation is omitted. In actual installation, the length of support column 2 is longer than the height of the first bracket. The bottom of support column 2 needs to be inserted into the hole in the ground. Since the depth of the hole excavation cannot be precisely determined, after excavating the hole to an approximate depth, the six support columns 2 are inserted into the corresponding holes. Then, the first bracket and the second bracket are set on the front and rear sides of the transformer substation foundation, respectively, to support the foundation. At this time, a level is used to check the levelness of the transformer substation foundation to ensure that the levelness of the foundation meets the standard in the initial state of the first and second brackets supporting the foundation. After the first and second brackets are erected, concrete is poured into the hole, and the installation of the transformer substation foundation is completed after the concrete sets.

[0034] The main technical problem this invention addresses is that after the first and second supports are erected, during the concrete curing process, due to poor geographical conditions at the installation site of the transformer substation foundation, such as uneven ground and insufficient soil bearing capacity, varying degrees of subsidence may occur during curing. Even slight subsidence can affect the levelness of the substation foundation after installation. Conventional supports cannot be readjusted after erection, necessitating reinstallation if the aforementioned problems occur during foundation installation. This invention addresses this issue by providing an adjusting ring 7 at the bottom of the vertical rod 5. By rotating the adjusting ring 7 forward or backward, and with the worker manually holding the fixing rod 8 to prevent rotation, the height of the adjusting ring 7 can be adjusted. This allows for the readjustment of the substation foundation to restore its levelness to the required standard should on-site ground subsidence occur during pouring. The lower end of the adjusting ring 7 is threadedly connected to the fixed rod 8. During adjustment, the adjusting ring 7 can be raised or lowered by rotating it. In the supported state, the threaded connection bears the pressure of the adjusting ring 7, and the adjusting ring 7 will not rotate due to gravity. The reason is that a thread is a helical mechanical structure that converts rotational motion into linear motion. When the threaded pair is subjected to axial load, the thread teeth squeeze against each other, forming friction, which counteracts the axial force and prevents loosening. Due to the large contact area between the threads and the fact that gravity can only compress the threads axially, there will be no relative movement even if the adjusted adjusting ring 7 is not fixed.

[0035] Furthermore, it also includes at least one second horizontal bar 10, with both ends of the second horizontal bar 10 fixed to the first bracket and the second bracket respectively by clamps 6. The second horizontal bar 10 is used to connect the first bracket located on the front side of the transformer substation foundation and the second bracket located on the rear side of the transformer substation foundation, reducing swaying and enhancing stability.

[0036] Furthermore, the wing plate 3 at the top of the support column 2 protrudes on both the front and rear sides. There are two first brackets, with the first horizontal rods 4 of the two first brackets located at the bottom of the front and rear wing plates 3 of the front support column 2, respectively. It also includes a short pipe 11, with both ends of the short pipe 11 connected to the two first brackets via clamps 6. There are also two second brackets, with the first horizontal rods 4 of the two second brackets located at the bottom of the front and rear wing plates 3 of the rear support column 2, respectively. The two second brackets are connected by another short pipe 11 via clamps 6. The paired first and second brackets are also for more stable support of the transformer foundation. The support column 2 has wing plates 3 on both the front and rear sides, and the two first brackets support the front and rear wing plates 3 respectively. The two first brackets clamp the support column 2, achieving a better fixing effect, preventing slippage even under external force.

[0037] Furthermore, a support plate 9 is snapped onto the bottom of the fixing rod 8; there are multiple support plates 9, including horizontal support plates 9 and support plates 9 at different inclination angles. One support plate 9 is selected and snapped onto the bottom of the fixing rod 8 to abut against the ground. The support plate 9 is designed to increase the contact area between the fixing rod 8 and the ground, preventing the fixing rod 8 from sliding. However, in uneven terrain, the fixing rod 8 is often erected on sloping ground. By setting multiple support plates 9 with different inclination angles, and selecting a support plate 9 with a suitable inclination angle according to the on-site installation conditions, a better anti-slip effect can be achieved.

[0038] like Figure 5 As shown, a bolt 71 is installed on the bottom side of the adjusting ring 7, with one end of the bolt 71 facing the fixing rod 8. By rotating the bolt 71, the fixing rod 8 can be tightened or loosened. The bolt 71 is locked after the adjusting ring 7 has been adjusted, preventing the adjusting ring 7 from being directly adjusted. Although the adjusting ring 7 will not rotate under gravity, it may still rotate under external force or misoperation. Therefore, the bolt 71 is provided to prevent the above situation from occurring.

[0039] The terms "connection" and "fixing" appearing in the description of this invention can refer to fixed connection, processing and forming, welding, or mechanical connection. The specific meaning of the above terms in this invention should be understood according to the specific circumstances.

[0040] In the description of this invention, the terms "center," "upper," "lower," "horizontal," "inner," and "outer," etc., are used only to indicate the orientation or positional relationship for the convenience of describing this invention and to simplify the description, and do not indicate or imply a specific orientation that the device or element referred to must have, and therefore should not be construed as a limitation of this invention.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for a prefabricated substation foundation, characterized in that: Includes the following steps, Step S1: Excavate the foundation pit for installing the transformer substation foundation; Step S2: Install multiple support columns (2) on the frame platform (1), hoist the frame platform (1) so that the multiple support columns (2) installed on the frame platform (1) are placed in the foundation pit respectively; Step S3: Install auxiliary supports around the frame platform (1) that can adjust the height of each support column (2). The auxiliary supports are erected on the land around the foundation pit to fix each support column (2). Use a level to check the levelness of the frame platform (1), adjust the height of the auxiliary support, and after the levelness adjustment of the frame platform is completed, pour concrete into the foundation pit. Step S4: Wait for the concrete in the foundation pit to solidify, retain the support columns (2) in the foundation pit, remove the frame platform (1) from the support columns (2) to obtain multiple support columns (2) on the same plane, forming a flat surface; Step S5: Install the foundation pedestal of the transformer substation platform onto the flat surface formed by the multiple support columns (2); The auxiliary support includes a first support and a second support respectively installed on the front and rear sides of the frame platform (1); The first support includes a first horizontal bar (4) and two vertical bars (5). The first horizontal bar (4) is located at the bottom of the wing plate (3) of the support column (2) and is used to support the support column (2) on the front side of the frame platform (1). The two vertical bars (5) are respectively installed at both ends of the first horizontal bar (4) by clamps (6). The structure of the second support is the same as that of the first support. An adjusting ring (7) is installed at the lower end of the vertical rod (5). The upper end of the adjusting ring (7) is rotatably connected to the bottom of the vertical rod (5). A fixed rod (8) is threadedly connected to the bottom of the adjusting ring (7). The bottom of the fixed rod (8) abuts against the ground. The overall height of the vertical rod (5) and the fixed rod (8) is adjusted by rotating the adjusting ring (7). It also includes at least one second horizontal bar (10), the two ends of which are fixed to the first bracket and the second bracket respectively by clamps (6); The wing plate (3) at the top of the support column (2) protrudes on both the front and rear sides. There are two first brackets. The first horizontal rod (4) of the two first brackets is located at the bottom of the wing plate (3) on the front and rear sides of the front support column (2). It also includes a short pipe (11). The two ends of the short pipe (11) are connected to the two first brackets by clamps (6). There are two second supports. The first horizontal bar (4) of the two second supports is located at the bottom of the front and rear wing plates (3) of the rear support column (2). The two second supports are connected by another short pipe (11) through a clamp (6).

2. The construction method for a prefabricated substation foundation according to claim 1, characterized in that: In step S1, the preset installation position of the support column (2) is first measured, a hole is drilled at the preset installation position, a foundation pit is excavated, and the foundation pit is cleaned.

3. The construction method for a prefabricated substation foundation according to claim 2, characterized in that: In step S1, a tracked spiral pile driver or a backhoe excavator with a pile driver is used to drill holes, and the excavated foundation pit is protected in time to prevent soil collapse.

4. The construction method for a prefabricated substation foundation according to claim 1, characterized in that: In step S3, before pouring concrete into the foundation pit, the waste residue in the foundation pit is removed, and the foundation pit is poured using a funnel, so that the part below the ground of the foundation pit is formed in one go. After the concrete pouring of the portion below the ground level of the foundation pit is completed, the portion above the ground level is poured using formwork erection.

5. The construction method for a prefabricated substation foundation according to claim 1, characterized in that: In step S3, after the concrete is poured, it is watered for curing.

6. The construction method for a prefabricated substation foundation according to claim 1, characterized in that: The bottom of the fixing rod (8) is snapped with a support plate (9); The support plate (9) has multiple supports, including horizontal supports (9) and supports (9) with different tilt angles. One support plate (9) is selected and snapped into the bottom of the fixed rod (8) to abut against the ground.

7. The construction method for a prefabricated substation foundation according to claim 1, characterized in that: A bolt (71) is installed on the bottom side of the adjusting ring (7), with one end of the bolt (71) facing the fixing rod (8). The fixing rod (8) can be tightened or loosened by rotating the bolt (71).

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