Construction method of floating platform foundation of floating type overwater photovoltaic concrete box transformer substation

Abstract

The invention discloses a construction method of a floating platform foundation of a floating type overwater photovoltaic concrete box transformer substation. The method comprises the following steps: firstly, arranging a sunken prefabricated site near a water body of a coal mining subsidence area, then intensively manufacturing an integral box transformer floating platform foundation by utilizing a prefabricated construction platform of the sunken prefabricated site, and then excavating a hauling floating platform channel for communicating the sunken prefabricated site with the water body of the coal mining subsidence area; then water is injected into the sunken prefabricated site to enable the integral box transformer floating platform foundations to float, then the integral box transformer floating platform foundations are dragged into a coal mining subsidence area water body one by one along the dragging floating platform channel, and after all the integral box transformer floating platform foundations in the same batch are dragged out of the sunken prefabricated site, the dragging floating platform channel is subjected to backfilling and tamping treatment; and finally, all the steps are repeated to manufacture and transfer the next batch of integral box transformer floating platform foundations, and so on, until construction of all the floating platform foundations is completed. The integrity, safety, stability, reliability, economical efficiency and construction efficiency can be effectively improved.

Description

Technical Field

[0001] The invention relates to a floating water photovoltaic concrete box-to-floating platform foundation, in particular to a construction method for a floating water photovoltaic concrete box-to-floating platform foundation, and belongs to the technical field of photovoltaic power generation. Background Art

[0002] As is known, floating photovoltaic power stations mainly use water platforms formed by ponds, small and medium-sized lakes, reservoirs, water storage tanks, and coal mining subsidence areas to float photovoltaic modules on the water surface to generate electricity. It is a photovoltaic system built on water, which can not only efficiently utilize solar energy, but also avoid occupying land resources.

[0003] Among them, the application of floating photovoltaic power stations in the water bodies of coal mining subsidence areas can make full use of the idle water surface in the coal mining subsidence area, control the use of the water surface within a reasonable range, reduce evaporation by covering the water surface, inhibit the growth of microorganisms in the water, and thus purify the water quality, and achieve long-term protection of the surrounding water environment. While optimizing the ecological environment, the "fish-light complementarity" model is adopted to turn "burden" into "wealth", and the abandoned subsidence area becomes a money bag for local income increase, a new base for new energy development, and the main force of carbon neutrality.

[0004] In the design of floating photovoltaic power stations on water, the floating platform of the box-type transformer usually adopts a steel pontoon structure or a pile-driven precast concrete platform. The pile-driven precast concrete platform is not suitable for areas with a large water depth in the final stage. The steel pontoon is expensive and has poor stability, and especially puts forward high requirements for corrosion protection. The replacement of the box-type transformer platform and the pollution of the water body caused by corrosion bring great losses to the environment and the project.

[0005] In order to overcome the above shortcomings, a prefabricated reinforced concrete floating platform with low cost, good stability and no need for special anti-corrosion operation is used. It is not only simple in structure and convenient in construction, but also safe, reliable, economical and environmentally friendly.

[0006] At present, the known prefabricated reinforced concrete floating platform of the floating photovoltaic power station in the coal mining subsidence area mainly has the following construction methods:

[0007] First, separate the formwork to prefabricate the split-type box-type floating platform foundation in an independent site, and then use mechanical lifting to launch it into the designated water surface.

[0008] The known prefabricated reinforced concrete floating platform is limited by the structural conditions of the platform itself. If it is made as a whole, the size and weight are too large to be hoisted on site. If its structure is strengthened to be hoisted as a whole, the cost and difficulty of hoisting and transportation are unacceptable, resulting in it having to be made separately and then assembled in water.

[0009] Due to the natural conditions of the lake shore and social conditions such as the high cost of requisitioning arable land, it is difficult to find a prefabrication site that is concentrated in an area and convenient for lifting machinery to enter and exit, resulting in limited existing site area.

[0010] The above construction method has the following problems:

[0011] First, the existing site can only prefabricate a small number of floating platforms at one time. For example, it can only accommodate the prefabrication of 3 sets of split-type box-type floating platform foundations at most. After launching, the split-type box-type floating platform foundation needs to be welded and assembled on water, which affects the overall appearance quality, and the water draft depth (four corners) has a large error.

[0012] Second, before welding and assembling on water, secondary lifting is required, that is, it needs to be lifted from the site to a transport flatbed truck for transfer, then transferred to the lifting point and then lifted into the water. The effect after launching into the water is unstable, which further aggravates the above-mentioned disadvantages caused by welding and assembling on water.

[0013] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0014] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the present invention proposes a construction method for a floating photovoltaic concrete box-to-floating platform foundation, which can effectively improve the integrity, safety, stability, reliability, economy and construction efficiency.

[0015] A construction method for a floating photovoltaic concrete box-to-floating platform foundation according to the present invention comprises the following steps:

[0016] Near the water body in the coal mining subsidence area, a sunken prefabrication site is constructed and arranged, and the sunken prefabrication site has a prefabricated construction platform and a water level regulation system;

[0017] In the sunken prefabrication site, a batch of integral box-type floating platform foundations are centrally manufactured based on the prefabricated construction platform;

[0018] excavating a haulage platform channel, the haulage platform channel being configured to connect the sunken prefabrication site with the water body in the coal mining subsidence area;

[0019] In the sunken prefabrication site, water is stored and a target water level is formed based on a water level regulation system, and the target water level is configured to be flush with the water level of the coal mining subsidence area;

[0020] After reaching the target water level, all the integral box-type floating platform foundations of a batch are floated on the sinking prefabrication site, and are towed one by one along the towing floating platform channel to the water body in the coal mining subsidence area;

[0021] After all the integral box-type transformer pontoon foundations of the same batch have been towed out of the sunken prefabrication site, the towing pontoon channel will be backfilled and compacted first, and then the water in the sunken prefabrication site will be drained and cleaned based on the water level regulation system;

[0022] After the concrete floor of the prefabricated construction platform is dried, repeat all the above steps to make and transfer the next batch of integral box-type transformer floating platform foundations into the water, and so on until the construction of all box-type transformer floating platform foundations is completed.

[0023] According to some embodiments of the present invention, the construction layout process of the sunken prefabricated site includes:

[0024] A water reservoir is excavated on the bank of the water body in the coal mining subsidence area;

[0025] Pour concrete floor at the bottom of the pool to form a prefabricated construction platform;

[0026] A drainage ditch is dug around the concrete ground, and sump pits are set up at both ends of the nearshore side of the drainage ditch. Each sump is equipped with a water pump. The water reservoir, drainage ditch, sump pit and water pump together constitute a water level regulation system.

[0027] According to some embodiments of the present invention, the surfaces of the drainage ditch and the sump are also provided with a cement mortar isolation layer.

[0028] According to some embodiments of the present invention, the manufacturing process of the integral box-type floating platform foundation includes:

[0029] Design the structure of the integral box-type substation floating platform foundation, and construct a single integral box-type substation floating platform foundation in steps;

[0030] Among them, it is necessary to first locate and draw lines on the prefabricated construction platform according to the geometric dimensions of the drawing, and then proceed with the above-mentioned step-by-step construction after confirmation.

[0031] According to some embodiments of the present invention, after the production of all integral box-type floating platform foundations of a batch is completed, they need to be cured for several days. When the concrete grade strength reaches more than 70% of the design strength, the floating platform channel is excavated and towed to release water into the reservoir.

[0032] According to some embodiments of the present invention, the water level of the water reservoir gradually increases until the foundation of the integral box-type transformer floating platform begins to float slowly. At this time, it is necessary to take floating platform protection measures that can prevent collisions.

[0033] According to some embodiments of the present invention, a batch of multiple integral box-type floating platform foundations are numbered during production, and during transportation, all the integral box-type floating platform foundations are towed in sequence according to the numbers.

[0034] According to the construction method of a floating water photovoltaic concrete box-type photovoltaic platform foundation of the present invention, a sunken prefabrication site and a natural floating and towing operation method can be utilized to meet the design requirements of prefabrication, installation, launching and other design requirements of the box-type photovoltaic platform foundation, thereby achieving effective improvement in the integrity, safety, stability, reliability, economy and construction efficiency of the construction process.

[0035] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0037] Figure 1 The present invention is a flow chart of some embodiments of the construction method of the floating water photovoltaic concrete box-to-floating platform foundation.

[0038] Figure 2 Schematic plan views of some embodiments of construction sites corresponding to the construction method of the present invention.

[0039] Meaning of reference numerals in the figure:

[0040] 100-sunken prefabricated site;

[0041] 110-prefabricated construction platform; 1101-water reservoir; 1102-concrete floor;

[0042] 120-water level regulating system; 1201-drainage ditch; 1202-sump;

[0043] 200-integral box-type floating platform foundation;

[0044] 300-Water bodies in coal mining subsidence areas. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0046] The construction method of the prefabricated reinforced concrete floating platform in the relevant technology of floating photovoltaic power stations on the water in coal mining subsidence areas is to first prefabricate the split box-type floating platform foundation with separate templates in independent sites, and then use mechanical lifting to launch it into the water to the designated water surface. However, due to the limited prefabrication site, the floating platform foundation needs to be hoisted twice, and the stability is poor after launching. In addition, the prefabrication site can only prefabricate a small number (for example, three sets) of split box-type floating platform foundations, which will result in the need for the split box-type floating platform foundation to be welded and assembled on the water after launching, resulting in poor overall appearance quality and large errors in the draft depth (four corners) on the water.

[0047] In view of this, the embodiment of the present invention application aims to provide a construction method for a floating water photovoltaic concrete box-type floating platform foundation. By setting up a sunken prefabrication site 100, the preparation and natural floating of the integral box-type floating platform foundation 200 are realized. On the one hand, compared with the existing split box-type floating platform foundation, the integral box-type floating platform foundation 200 can produce more (seven sets) at one time, which simplifies the process, improves construction efficiency, and reduces costs. Moreover, by towing instead of lifting, combined with the effect of buoyancy, the integrity, stability, and safety after launching are greatly improved, so that the four angular errors of the draft depth are fully in line with and higher than the design requirements, thereby solving the above-mentioned problems.

[0048] Figure 1 1 is a flow chart of a construction method for converting a floating photovoltaic concrete box into a floating platform foundation according to an embodiment of the present invention. Figure 1 As shown, a construction method for a floating photovoltaic concrete box-to-floating platform foundation provided by an embodiment of the present invention includes the following steps:

[0049] S100, constructing and arranging a sunken prefabrication site 100 near a water body 300 in a coal mining subsidence area, wherein the sunken prefabrication site 100 has a prefabricated construction platform 110 and a water level regulating system 120;

[0050] S200, in the sunken prefabrication site 100, a batch of integral box-type floating platform foundations 200 are centrally manufactured based on the prefabricated construction platform 110;

[0051] S300, excavating a towing floating platform channel, the towing floating platform channel is configured to connect the sunken prefabrication site 100 and the water body 300 in the coal mining subsidence area;

[0052] S400, in the sunken prefabrication site 100, water is stored and a target water level is formed based on the water level regulating system 120, and the target water level is configured to be flush with the horizontal plane of the water body 300 in the coal mining subsidence area;

[0053] S500, after reaching the target water level, all the integral box-type floating platform foundations 200 of a batch are floated on the sinking prefabrication site 100, and are towed one by one along the towing floating platform channel to the water body 300 of the coal mining subsidence area;

[0054] S600, after all the integral box-type transformer pontoon foundations 200 of the same batch are towed out of the sunken prefabrication site 100, the towing pontoon channel is backfilled and compacted, and then the water in the sunken prefabrication site 100 is drained and cleaned based on the water level regulating system 120;

[0055] S700, after the concrete floor 1102 of the prefabricated construction platform 110 is dried, repeat all the above steps to manufacture and transfer the next batch of integral box-type transformer floating platform foundations 200 into the water, and so on, until the construction of all box-type transformer floating platform foundations is completed.

[0056] Figure 2 is a plan view of a construction site corresponding to the construction method of an embodiment of the present invention, mainly showing the layout of the sunken prefabricated site 100, and continuing to refer to Figure 2 In some implementations of the embodiments of the present invention, the construction layout process of the sunken prefabrication site 100 includes:

[0057] A reservoir 1101 is excavated on the bank of the water body 300 in the coal mining subsidence area;

[0058] Concrete floor 1102 is poured at the bottom of the pool to form a prefabricated construction platform 110;

[0059] A drainage ditch 1201 is excavated around the concrete floor 1102, and sump pits 1202 are set at both ends of the nearshore side of the drainage ditch 1201. Each sump pit 1202 is equipped with a water pump. The water reservoir 1101, the drainage ditch 1201, the sump pit 1202 and the water pump together constitute the water level regulation system 120.

[0060] In actual implementation, a 900m2 trench can be excavated 10m offshore. 2 , a water reservoir 1101 with a depth ≥1.5m, a concrete floor 1102 cast at the bottom of the reservoir with a drainage ditch 1201 of 500mm width and 300mm depth set around it, collection pits 1202 of 1.5m*1.5m*1.0m are set at the two corners near the shore, the drainage ditch 1201 and the collection pit 1202 are made of cement mortar isolation layer, and a waterway of 10m width and 1.5m depth (basically level with the water reservoir 1101) is excavated near the shore as a channel for towing the floating platform.

[0061] In this embodiment, the waterway should be excavated from the inside to the outside (i.e., from the side of the reservoir 1101 to the shore), and the excavation depth should be level with the bottom of the reservoir 1101. Finally, leave a width of about 1m to slowly excavate and release water into the pool. Do not dig a large hole to release water instantly, so as to avoid the floating platforms from colliding with each other and being damaged after floating up under the impact of heavy water.

[0062] Furthermore, a high-power water pump can be used to fill and drain the reservoir; a PC200 excavator and a ship can be used to complete the excavation and hauling operations respectively.

[0063] In order to make cleaning easier, in some implementations of the embodiments of the present invention, the surfaces of the drainage ditch 1201 and the sump 1202 are also provided with a cement mortar isolation layer.

[0064] In some implementations of the present invention, the manufacturing process of the integral box-type floating platform foundation 200 includes:

[0065] Design the structure of the integral box-type transformer floating platform foundation 200, and construct a single integral box-type transformer floating platform foundation 200 in steps;

[0066] Among them, it is necessary to first locate and draw lines on the prefabricated construction platform 110 according to the geometric dimensions of the drawing, and then carry out the above-mentioned step-by-step construction after confirmation.

[0067] In specific implementation, the structure of the integral box-type transformer floating platform foundation 200 can be designed to include a reinforced concrete floating platform top plate, reinforced concrete ribs and polystyrene foam. For more specific structure, please refer to the applicant's previous utility model patent, a water-surface floating reinforced concrete floating platform (CN219428337 U). Based on this structure, the construction process of a single integral box-type transformer floating platform foundation 200 can be as follows:

[0068] First, fix the polystyrene foams that meet the size and are free of any pollution on the flat ground at the required intervals. Preferably, a film can be laid on the ground to prevent moisture loss in the concrete and isolate it from the ground.

[0069] Then, steel mesh is tied around the polystyrene foam and between the foams to form a whole, and an exemplary steel strength grade may be HRB400;

[0070] Next, after supporting the formwork around the whole structure, pour concrete, such as fine stone concrete with a strength grade of not less than C45, and fully vibrate it. The top slab of the reinforced concrete floating platform can be dodged and embedded according to the design requirements.

[0071] It should be noted that the specifications of the integral box-type transformer floating platform foundation 200 prepared in the embodiment of the present invention are at least twice those of the split box-type transformer floating platform foundation in the prior art. For example, the size of an integral box-type transformer floating platform foundation is 10m*6m, and the sizes of two split box-type transformer floating platform foundations are 10m*6m respectively, so there is no need for water splicing.

[0072] In some implementations of the embodiments of the present invention, after all the integral box-type floating platform foundations 200 of a batch are produced, they need to be cured for several days. When the concrete grade strength reaches more than 70% of the design strength, the floating platform channel is excavated and towed to release water into the reservoir 1101.

[0073] For example, the integral box-type floating platform foundation 200 can be produced and cured for about 7 days, so that the concrete grade strength can reach more than 70% of the design strength.

[0074] In some implementations of the embodiments of the present invention, the water level of the water reservoir 1101 gradually increases until the integral box-type transformer floating platform foundation 200 begins to slowly float up. At this time, it is necessary to take protective measures for the floating platform to prevent collision.

[0075] The above-mentioned floating platform protection measures specifically include:

[0076] 1. Anchor the floating platform horizontally with ropes in advance to prevent collision when floating;

[0077] 2. Buffer tires or rubber pads and other floating bodies are hung on the edge of the floating platform, or when towing, people standing diagonally on the floating platform to adjust the direction can hold a long pole to adjust the direction at any time, all of which are used to prevent collision damage during towing.

[0078] In specific implementation, generally when the water depth reaches about 0.8m, the floating platform will slowly float up. It should be noted that the water should be released gradually to minimize the height difference of the water surface of the reservoir 1101.

[0079] In some implementations of the embodiments of the present invention, a batch of multiple integral container-type floating platform foundations 200 are numbered during production, and during transportation, all the integral container-type floating platform foundations 200 are towed in sequence according to the numbers.

[0080] In the specific operation, after the water level of the reservoir 1101 is level with the water level of the coal mining subsidence area 300, press Figure 2 The intermediate floating platforms are towed out of the production area one by one in order of their numbers from small to large, and fixed to the shore nearby.

[0081] The principle of the above sequence is that the floating platforms near the exit and the edge area are towed out first. The advantage is that it can make the towing channel larger and larger, and the edge first can reduce the collision of floating platforms and try to avoid collision and appearance damage during towing.

[0082] In the specific implementation, the equipment can be towed to the lakeside and anchored with ropes on the fixed piles on the shore, which will facilitate the personnel to get on and off the floating platform and the lifting of the box transformer. After the box transformer and its ancillary equipment on the floating platform are installed, they will be towed to the designated installation location by towing vessels. The towing order should be convenient for the passage of the waterway.

[0083] The floating water photovoltaic concrete box-type substation buoy foundation of the embodiment of the present invention can successfully enter the water body 300 in the coal mining subsidence area based on its construction method, and can then be further hard-connected with the power generation array in the horizontal direction through fixed steel pipes to achieve permanent anchoring on the water, thereby achieving synchronous movement with the power generation array and reducing the impact of wind and waves on the box-type substation platform.

[0084] In the description of the present invention, it should be understood that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0085] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0086] The above are only preferred embodiments of the present invention and are not intended to limit the present invention in any form. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the present invention.

Claims

1. A construction method for a floating photovoltaic concrete box-to-floating platform foundation, characterized in that: The following steps are involved: Near the water body in the coal mining subsidence area, a sunken prefabrication site is constructed and arranged, and the sunken prefabrication site has a prefabricated construction platform and a water level adjustment system; In the sunken prefabrication site, a batch of integral box-type floating platform foundations are centrally manufactured based on the prefabricated construction platform; excavating a towing floating platform channel, wherein the towing floating platform channel is configured to connect the sunken prefabrication site and the water body of the coal mining subsidence area; In the sunken prefabrication site, water is stored and a target water level is formed based on the water level regulating system, and the target water level is configured to be flush with the horizontal plane of the water body in the coal mining subsidence area; After reaching the target water level, all the integral box-type floating platform foundations of a batch are floated on the sinking prefabrication site, and are towed one by one along the towing floating platform channel to the water body of the coal mining subsidence area; After all the integral box-type transformer buoy foundations of the same batch are towed out of the sunken prefabrication site, the towing buoy channel is backfilled and compacted, and then the water in the sunken prefabrication site is drained and cleaned based on the water level adjustment system; After the concrete floor of the prefabricated construction platform is dried, repeat all the above steps to manufacture and transfer the next batch of integral box-type transformer floating platform foundations into the water, and so on until the construction of all box-type transformer floating platform foundations is completed.

2. The construction method of a floating photovoltaic concrete box-to-floating platform foundation according to claim 1 is characterized in that: The construction layout process of the sunken prefabricated site includes: A water reservoir is excavated on the bank of the water body in the coal mining subsidence area; pouring concrete floor at the bottom of the pool to form the prefabricated construction platform; A drainage ditch is excavated around the concrete ground, and sump pits are set at both ends of the nearshore side of the drainage ditch. Each sump pit is equipped with a water pump. The water reservoir, the drainage ditch, the sump pit and the water pump together constitute the water level regulation system.

3. The construction method of a floating photovoltaic concrete box-to-floating platform foundation according to claim 2 is characterized in that: The surfaces of the drainage ditch and the sump are also provided with a cement mortar isolation layer.

4. The construction method of a floating photovoltaic concrete box-to-floating platform foundation according to claim 2 is characterized in that: The manufacturing process of the integral box-type floating platform foundation includes: Designing the structure of the integral box-type transformer floating platform foundation, and constructing individual integral box-type transformer floating platform foundations in steps; Among them, it is necessary to first locate and draw lines on the prefabricated construction platform according to the geometric dimensions of the drawing, and then proceed with the above-mentioned step-by-step construction after confirmation.

5. The construction method of a floating photovoltaic concrete box-to-floating platform foundation according to claim 4 is characterized in that: After the production of all the integral box-type floating platform foundations of a batch is completed, they need to be cured for several days. When the concrete grade strength reaches more than 70% of the design strength, the floating platform channel can be excavated to release water into the reservoir.

6. The construction method of a floating photovoltaic concrete box-to-floating platform foundation according to claim 5 is characterized in that: When the water level of the reservoir gradually increases until the foundation of the integral box-type transformer floating platform begins to float slowly, it is necessary to take floating platform protection measures that can prevent collision.

7. A construction method for a floating photovoltaic concrete box-to-floating platform foundation according to any one of claims 1 to 6, characterized in that: The batch of multiple integral box-type transformer floating platform foundations are numbered during production, and during transportation, all the integral box-type transformer floating platform foundations are towed in sequence according to the numbers.

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