A foundation platform of a box-type transformer of a photovoltaic power station on a steep mountain

Abstract

This utility model discloses a foundation platform for a box-type transformer for a photovoltaic power station on steep mountainous terrain, solving the problem of how to overcome the on-site environment for constructing the box-type transformer foundation platform; six pile foundation pits (2) are set at intervals on the slope of collapsible loess and gravel layer (1), and a PVC corrugated pipe (3) is set in each pile foundation pit. The top of the PVC corrugated pipe is 1000 mm above the ground. A corrugated pipe steel cage (4) and cast-in-place concrete (5) are set inside the PVC corrugated pipe. Platform connecting bolts (7) are pre-embedded on the top end of the PVC corrugated pipe; through holes (9) are set on the lower flange plate of the I-shaped steel beam (8), and an I-shaped steel beam is set between the top ends of adjacent PVC corrugated pipes. The platform connecting bolts are movably sleeved in the through holes (9); a steel plate platform (11) is welded to the top surface of the upper flange plate of the I-shaped steel beam; so that the platform can better adapt to the soft mountainous environment.

Description

Technical Field

[0001] This utility model relates to a mountain photovoltaic power generation device, and more particularly to a base platform for a box-type transformer of a photovoltaic power station deployed on steep mountain terrain. Background Technology

[0002] In photovoltaic (PV) power plants, box-type transformers play a crucial role. The direct current (DC) generated by the PV modules is first inverted into alternating current (AC) by an inverter, then stepped up to 35 kV AC by the box-type transformer. Finally, the AC is collected by collector lines and sent to a substation, where it is stepped up to 220 kV before being connected to the national grid. For large-scale PV systems deployed on hillsides, box-type transformers are installed on-site near the PV modules. These transformers need to be mounted on a foundation platform to withstand the harsh mountain climate. Existing foundation platforms for box-type transformers require pile foundations, and constructing these pile foundations necessitates the use of large construction equipment. However, due to the steep terrain and narrow mountain roads at the construction site, large construction equipment cannot access the site for construction. Secondly, due to the steep terrain, the impact of flash floods during heavy rain is significant, making the safety and stability of the foundation platform a primary concern during construction. Furthermore, the transformer substation requires an oil storage tank for fault diagnosis and repair. Current technology involves pouring a concrete structure oil storage tank near the substation foundation platform, but in areas with soft soil, cracking and water seepage frequently occur. Therefore, developing a suitable transformer substation foundation platform for steep mountain photovoltaic power stations has become an urgent problem to be solved on-site. Summary of the Invention

[0003] This utility model provides a foundation platform for a box-type transformer in a photovoltaic power station on steep mountainous terrain, solving the technical problem of how to overcome the on-site environment to construct the box-type transformer foundation platform.

[0004] This utility model solves the above technical problems through the following technical solution:

[0005] A foundation platform for a box-type transformer in a photovoltaic power station on steep mountainous terrain includes a slope of collapsible loess and gravel, an I-beam, and a steel plate platform. Six pile pits are spaced apart on the slope of collapsible loess and gravel. In each pile pit, a PVC corrugated pipe is installed vertically, with the top of the PVC corrugated pipe extending 1000 mm above ground level. A corrugated pipe reinforcement cage and cast-in-place concrete are installed inside the PVC corrugated pipe. Platform connecting bolts are pre-embedded at the top ends of the PVC corrugated pipes. Through holes are provided on the lower flange of the I-beam. I-beams are installed between the tops of adjacent PVC corrugated pipes. The platform connecting bolts are movably fitted into the through holes, and anti-loosening nuts are screwed onto the tops of the connecting bolts. A steel plate platform is welded to the top surface of the upper flange of the I-beam.

[0006] Micro-hole cast-in-place piles are installed at the bottom of the pile foundation pit. The micro-hole cast-in-place pile reinforcement cage is welded to the corrugated pipe reinforcement cage. Cast-in-place concrete is installed in the pile foundation pit outside the PVC corrugated pipe.

[0007] An oil storage tank is buried in the collapsible loess and gravel slope between the two pile foundation pits directly below the steel plate platform; a long concrete slab is set on the slope on one side of the steel plate platform, and a stair connecting steel plate is pre-embedded in the long concrete slab. The lower end of the steel integral staircase is welded to the stair connecting steel plate, and the upper end of the steel integral staircase is connected with angle steel. The upper end of the steel integral staircase is movably connected to the steel plate platform through the angle steel; a guardrail is set around the steel plate platform, and a box-type transformer is installed on the steel plate platform.

[0008] This invention allows for the construction of a cast-in-place concrete column on collapsible loess and gravel slopes. The process involves manually excavating a pit approximately 1 meter deep and 500 mm in diameter, setting up a micro-hole grouting column at the bottom of the pit, placing a large-diameter PVC corrugated pipe inside, installing a reinforcing cage within the PVC corrugated pipe, and then pouring concrete. This creates a cast-in-place concrete column higher than the ground level, forming a unified pile foundation with the micro-hole pile. This reduces on-site construction difficulty, eliminates the need for large pile foundation construction equipment, and can be completed manually. The six pile columns are movably connected to the steel platform, preventing rigid tearing of the platform due to settlement in the soft soil and providing convenient support for the platform in case of pile foundation settlement. The movable connection between the ladder and the platform also avoids the risk of platform tearing due to ground settlement at the ladder location. The overall construction cost of the platform is low, making it better suited to soft soil mountain environments. Attached Figure Description

[0009] Figure 1 is a structural schematic diagram of this utility model in the front view direction;

[0010] Figure 2 is a schematic diagram of the structure of this utility model in the side view direction;

[0011] Figure 3 is a structural schematic diagram of the steel integral staircase 16 of this utility model. Detailed Implementation

[0012] The present invention will now be described in detail with reference to the accompanying drawings:

[0013] A foundation platform for a photovoltaic power station box-type transformer on steep mountain terrain includes a slope 1 of collapsible loess and gravel, an I-beam steel beam 8, and a steel plate platform 11. The mountain strata surface consists of collapsible loess and gravel, with an unstable geological structure prone to collapse and landslides. Six pile foundation pits 2 are spaced apart on the slope 1 of collapsible loess and gravel, arranged in a matrix. Due to the relatively soft strata, the pile foundation pits 2 can be excavated manually or with a small excavator. In each pile foundation pit 2, a PVC corrugated pipe 3 is installed vertically, with the top of the PVC corrugated pipe 3 extending 1000 mm above the ground. A corrugated pipe reinforcement cage 4 and cast-in-place concrete 5 are installed inside the PVC corrugated pipe 3. Platform connecting bolts 7 are pre-embedded at the top end of the PVC corrugated pipe 3. The PVC corrugated pipe 3 replaces the concrete column casting formwork, forming six concrete columns on the mountain slope. The I-beam steel beam 8... A through hole 9 is provided on the lower flange plate. An I-beam steel beam 8 is provided between the top ends of adjacent PVC corrugated pipes 3. The platform connecting bolt 7 is movably sleeved in the through hole 9. An anti-loosening nut 10 is screwed to the top of the connecting bolt 7. One I-beam steel beam 8 can be set on the three concrete columns on the front side, and another I-beam steel beam can be set on the three concrete columns on the rear side. A steel plate platform 11 is welded to the top surface of the upper flange plate of the two I-beam steel beams 8. This makes the entire steel platform and the six columns in a movable overlapping state. When one of the columns settles, it will not exert rigid pull on the steel platform, protecting the stability of the steel platform and creating conditions for timely on-site handling. The entire steel platform is pressed against the six columns by its own weight and is in a stable operating state. The anti-loosening nut 10 also ensures that the columns and the steel platform will not be separated in the event of settlement. The diameter of the through hole 9 is larger than the outer diameter of the platform connecting bolt 7, but smaller than the diameter of the anti-loosening nut 10.

[0014] Micro-hole cast-in-place piles are installed at the bottom of the pile foundation pit 2. The micro-hole cast-in-place pile reinforcement cage is welded to the corrugated pipe reinforcement cage 4. The micro-hole cast-in-place piles are generally installed on the rock below the collapsible loess and gravel layer to make the entire pile foundation more stable. Cast-in-place concrete 6 is installed in the pile foundation pit 2 outside the PVC corrugated pipe 3 to make the column form a stable state with a larger bottom and a smaller top.

[0015] An oil storage tank 13 is buried in the collapsible loess and gravel slope 1 between the two pile pits 2 directly below the steel plate platform 11. The oil drain pipe of the transformer on the platform is connected to the oil storage tank 13. The oil storage tank 13 replaces the cast-in-place concrete oil storage pool, which is convenient for construction, operation and maintenance. A concrete strip 14 is set on the slope on one side of the steel plate platform 11. A stair connecting steel plate 15 is pre-embedded in the concrete strip 14. The lower end of the steel integral staircase 16 is welded to the stair connecting steel plate 15. Angle steel 17 is connected to the upper end, and the upper end of the steel integral staircase 16 is movably connected to the steel plate platform 11 through angle steel 17. This utility model movably connects the integral steel platform, concrete foundation column and climbing ladder, which is adapted to the soft mountain terrain environment and ensures that the steel platform is deformed as little as possible. At the same time, the entire steel platform is suspended in the air, which plays a role in resisting mountain floods and is also conducive to ventilation and heat dissipation during the operation of the box-type transformer. Guardrails 12 are set around the steel plate platform 11, and the box-type transformer is installed on the steel plate platform 11.

Claims

1. A foundation platform for a box-type transformer in a photovoltaic power station on steep mountain terrain, comprising a slope of collapsible loess and gravel (1), an I-beam (8), and a steel plate platform (11), characterized in that, Six pile foundation pits (2) are set at intervals on the collapsible loess and gravel slope (1). In each pile foundation pit (2), a PVC corrugated pipe (3) is set along the vertical direction. The top of the PVC corrugated pipe (3) is 1000 mm above the ground. A corrugated pipe reinforcement cage (4) and cast-in-place concrete (5) are set inside the PVC corrugated pipe (3). A platform connecting bolt (7) is pre-embedded on the top end of the PVC corrugated pipe (3). A through hole (9) is set on the lower flange plate of the I-shaped steel beam (8). An I-shaped steel beam (8) is set between the top ends of adjacent PVC corrugated pipes (3). The platform connecting bolt (7) is movably sleeved in the through hole (9). An anti-loosening nut (10) is screwed on the top of the connecting bolt (7). A steel plate platform (11) is welded to the top surface of the upper flange plate of the I-shaped steel beam (8).

2. The foundation platform for a box-type transformer in a photovoltaic power station on steep mountainous terrain according to claim 1, characterized in that, Micro-hole cast-in-place piles are installed at the bottom of the pile foundation pit (2). The micro-hole cast-in-place pile reinforcement cage is welded to the corrugated pipe reinforcement cage (4). Cast-in-place pipe concrete (6) is installed in the pile foundation pit (2) outside the PVC corrugated pipe (3).

3. The foundation platform for a box-type transformer for a photovoltaic power station on steep mountainous terrain according to claim 2, characterized in that, An oil storage tank (13) is buried in the collapsible loess and gravel slope (1) between the two pile foundation pits (2) directly below the steel plate platform (11); a concrete strip (14) is set on the slope on one side of the steel plate platform (11), and a stair connecting steel plate (15) is pre-embedded in the concrete strip (14). The lower end of the steel integral staircase (16) is welded to the stair connecting steel plate (15), and an angle steel (17) is connected to the upper end of the steel integral staircase (16). The upper end of the steel integral staircase (16) is movably connected to the steel plate platform (11) through the angle steel (17); a guardrail (12) is set around the steel plate platform (11), and a box-type transformer is installed on the steel plate platform (11).

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