Prefabricated concrete roof structure and photovoltaic support based on photovoltaic building integration

Abstract

The utility model discloses a prefabricated concrete roof structure and a photovoltaic bracket based on photovoltaic building integration; the prefabricated structure includes a prefabricated photovoltaic bracket foundation and embedded anchor bars; the lower end of the embedded anchor bars is embedded in the concrete roof panel, and the upper end is exposed; the prefabricated photovoltaic bracket foundation is a reinforced concrete structure, with embedded parts on the top, and reserved sockets that penetrate the concrete and embedded parts are provided inside, and the upper end of the embedded anchor bars is connected to the embedded parts after being inserted into the reserved sockets; the photovoltaic bracket is assembled by main purlins and secondary purlins through a number of buckling components according to a specific module, and the photovoltaic bracket is fixed on the prefabricated photovoltaic bracket foundation arranged in a matrix. The utility model establishes a standard module for photovoltaic brackets, which is suitable for most mainstream crystalline silicon photovoltaic products, facilitates the integrated molding of building roofs and photovoltaic panels, can solve the problem of mismatch between photovoltaic and civil construction construction periods, and greatly improves work efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic panel construction and application, and in particular to a photovoltaic support bracket with a prefabricated concrete roof structure based on photovoltaic building integration. Background Art

[0002] The combination of photovoltaic matrix and building roof is a common form of photovoltaic building integration (BIPV). Photovoltaic brackets are widely used for laying solar photovoltaic panels on concrete roofs. The photovoltaic bracket structure must be strong and reliable, able to withstand wind loads, snow loads and other external effects, while ensuring the waterproof effect of the concrete roof. According to different construction methods, the photovoltaic bracket structure construction schemes in the existing technology are divided into two categories.

[0003] The first existing technical solution is mainly to use embedded parts and photovoltaic brackets in the concrete roof in the early stage. The problems of this type of solution are as follows:

[0004] (1) As the sizes of photovoltaic products on the market vary, the pre-embedded points need to be determined in advance. However, in general, the brand determination and construction of photovoltaic panels lag behind civil construction. Therefore, during the civil construction stage, the positioning of the embedded parts of the photovoltaic bracket cannot be well matched with the size of the photovoltaic panel components determined later, resulting in repeated construction and waste of materials and labor.

[0005] (2) The embedded parts connecting the photovoltaic panels to the roof are fixed with limit bolts and concrete grouting (such as patent CN219740244U). The structural strength is limited. In order to solve the wind pressure (back load) and snow load (front load), a thicker concrete foundation is required to meet the structural safety requirements. This method has a complex internal structure, and the construction process, especially the grouting process, is troublesome. The waterproofing measures are constructed later, so the construction is complicated and the efficiency is low.

[0006] (3) The embedded parts connecting the photovoltaic panels and the roof require hot melt adhesive and energized wires to form (such as patent CN220475651U). The embedded parts have a complex structure and implementation method, which is not conducive to rapid construction and cost reduction.

[0007] The second existing technical solution is mainly to build a photovoltaic bracket on the completed concrete roof at a later stage. This type of solution has the following problems:

[0008] (1) The photovoltaic bracket is fixed with expansion bolts (such as patents CN219740256U and CN220440603U), which solves the problem of fixing the bracket of the photovoltaic power generation system on the concrete roof, but it still damages the finished surface of the roof and the waterproof layer, resulting in construction waste. Among them, patent CN220440603U uses the side blocking method of the photovoltaic array to form a closed space under the photovoltaic panel to solve the wind pressure problem, but because this solution forms a nearly closed cavity under the photovoltaic panel, it seriously affects the heat dissipation of the photovoltaic, thereby reducing the efficiency of photovoltaic power generation.

[0009] (2) The photovoltaic bracket adopts a combination of photovoltaic counterweight and anchor (such as patent CN219420651U), which reduces the volume of the counterweight and manufacturing cost, and also reduces the roof load and the requirements for roof strength. However, this solution does not ensure effective heat dissipation space between the photovoltaic panel and the roof (the photovoltaic panel should ensure a certain height from the ground), which leads to a decrease in photovoltaic power generation efficiency; and because this solution requires drilling holes in the roof and planting steel bars to fix the foundation after civil construction, there is damage to the roof waterproof layer and repeated construction, resulting in construction waste.

[0010] Summarizing the above content, it can be seen that the existing concrete roof photovoltaic bracket and its construction mainly have the following problems:

[0011] If the photovoltaic bracket foundation adopts the embedded parts method, it is formed in one piece during the civil construction stage. When the photovoltaic panels are installed, the bracket does not need to damage the roof. However, during the civil roof construction stage, the embedded parts cannot be accurately located due to the uncertainty of the photovoltaic panel brand and size. In addition, the existing embedded parts method often has complicated construction procedures and high labor costs.

[0012] If expansion bolts are used as the foundation of the photovoltaic bracket after the roof construction is completed, this method will damage the roof waterproofing and lead to repeated construction of the roof waterproofing;

[0013] If concrete counterweights are used as the foundation of the photovoltaic support after the roof construction is completed, this method will greatly increase the load-bearing capacity of the roof and lead to waste of construction materials. Utility Model Content

[0014] In order to solve the problems existing in the prior art, the utility model provides a prefabricated concrete roof structure and photovoltaic bracket based on photovoltaic building integration, which is adapted to the mainstream crystalline silicon photovoltaic products on the market, and is used to solve the problems existing in the prior art that photovoltaic construction lags behind civil construction, resulting in inaccurate positioning of photovoltaic brackets, affecting the waterproofing of building roofs, construction waste, low efficiency, etc.

[0015] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0016] In the first aspect, the utility model provides a prefabricated concrete roof structure based on photovoltaic building integration, including a prefabricated photovoltaic bracket foundation and embedded anchor bars; the lower end of the embedded anchor bars is buried in the concrete roof, and the upper end is exposed; the prefabricated photovoltaic bracket foundation adopts a reinforced concrete structure, and an embedded part is provided on the top, and a reserved hole penetrating the concrete and the embedded part is provided in the prefabricated photovoltaic bracket foundation, and the upper end of the embedded anchor bars is connected with the concrete and the embedded part after being inserted into the reserved hole; the embedded part is preferably an embedded steel plate.

[0017] Furthermore, the embedded anchor bar is arranged in an L shape, and the bending part of the embedded anchor bar overlaps with the main reinforcement in the concrete roof. The vertical part of the embedded anchor bar is used to fix the prefabricated photovoltaic bracket foundation, and the bent part is used to increase the firmness and strength of the foundation.

[0018] Furthermore, the embedded anchor bar and the embedded part are connected by perforation plug welding, and concrete mortar is filled between the embedded anchor bar and the concrete in the prefabricated photovoltaic support foundation.

[0019] Furthermore, the height difference between the prefabricated photovoltaic support foundation and the concrete roof is not less than 200 mm, preferably 500 mm; a polymer cement mortar protective layer is laid on the outermost layer of the prefabricated photovoltaic support foundation and the concrete roof to enhance waterproofing.

[0020] In the second aspect, the utility model provides a concrete roof photovoltaic bracket based on photovoltaic building integration, including two main purlins, two first purlins, two second purlins, and several buckling components. The two main purlins are arranged parallel to the length direction of the photovoltaic panel, and their ends are fixed on the prefabricated photovoltaic bracket foundation. Multiple prefabricated photovoltaic bracket foundations are arranged in a matrix. The two first purlins are perpendicular to the main purlins and are respectively connected to the two ends of the main purlins through buckling components. The two second purlins are arranged parallel to the first purlins and are connected to the middle of the main purlins through buckling components. The spacing between the two main purlins and the spacing between the first purlins and the second purlins are adjustable; the photovoltaic bracket forms a universal photovoltaic installation matrix, which is suitable for most existing crystalline silicon photovoltaic panel products on the market.

[0021] Furthermore, the cross-section of the main purlin, the first purlin or the second purlin is in a concave shape, and a notch is provided at the top along the length direction.

[0022] Furthermore, the clamping assembly includes a pressure block, a fixing bolt, and a positioning nut. The pressure block is clamped on the photovoltaic panel, and the positioning nut is clamped in the groove of the first purlin or the second purlin. The fixing bolt passes through the pressure block and is threadedly connected to the positioning nut. The fixing bolt is tightened to anchor the photovoltaic panel.

[0023] Furthermore, the main purlin is provided with a plurality of connecting plates, and the plurality of connecting plates are connected to the first purlin or the second purlin, and the connecting plates play a role of auxiliary welding connection.

[0024] Furthermore, the lateral spacing between the two main purlins is 4576-4656mm, preferably 4600mm, wherein the width of the photovoltaic panel is 1134mm, and the spacing between the photovoltaic panels is 10-30mm, preferably 16mm; the longitudinal spacing between the two first purlins is 3800-4000mm; the longitudinal spacing between the first purlin and the second purlin is 1600-1700mm; for the same project, the photovoltaic bracket adopts a fixed modulus size, and the modulus size is not related to snow load and wind load, and will not be adjusted due to different loads. The spacing between the main purlins, the first purlins, and the second purlins in the photovoltaic bracket will not change, but the material thickness and size of the main purlins, the first purlins, and the second purlins can be adjusted to adjust the strength to adapt to different loads. Different modulus sizes can be selected for different projects.

[0025] Furthermore, different photovoltaic brackets are arranged continuously in the transverse direction, with a longitudinal spacing of 500-1200 mm, preferably 800 mm.

[0026] Compared with the prior art, the utility model has the following beneficial technical effects:

[0027] 1. The utility model investigates photovoltaic panel products that meet the current industry standard width of the national photovoltaic industry (there is no national standard yet), utilizes standard modulus, main purlins, secondary purlins (referring to the first purlin and the second purlin) modularization method, and combines the embedded parts positioning method in the concrete roof photovoltaic support structure. It can be integrated with the building roof in advance before the photovoltaic panel products are determined, and can adapt to the vast majority of mainstream roof crystalline silicon module photovoltaic products, solve the problem of mismatch between photovoltaic construction and civil construction period, and greatly improve work efficiency.

[0028] 2. The modular matrix photovoltaic bracket described in the utility model can calculate the structural load in advance, and comprehensively calculate the size of the photovoltaic bracket matrix, the weight of the photovoltaic panels, and the snow load and wind pressure in the area to obtain the optimal material solution for the photovoltaic bracket, thereby greatly reducing the cost of the photovoltaic bracket.

[0029] 3. The prefabricated photovoltaic bracket foundation of the utility model is integrated into the building, can be manufactured in advance, and is simple and fast to construct; the force support of the prefabricated photovoltaic bracket foundation is based on the connection between the L-shaped anchor bars and the steel bars in the building roof panel, which uses less material, has light load, high stability, and will not damage the roof waterproof layer, thus avoiding the waste caused by repeated roof waterproof construction, and has excellent comprehensive benefits.

[0030] 4. The modular matrix photovoltaic bracket described in the utility model only needs to reserve a metal plate on the basis of the prefabricated photovoltaic bracket during civil construction. When installing the photovoltaic bracket, only welding is required to complete the bracket installation. The construction is convenient and can greatly save labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a plan view of a photovoltaic bracket.

[0032] Figure 2 This is a schematic diagram of the structure of the prefabricated photovoltaic support foundation; Figure 2 (a) is a cross-sectional schematic diagram, Figure 2 (b) is an enlarged oblique cross-sectional view of the upper part.

[0033] Figure 3 This is an oblique view of the embedded parts on the foundation of the prefabricated photovoltaic support.

[0034] Figure 4 An oblique view of the prefabricated photovoltaic support foundation.

[0035] Figure 5 This is a schematic diagram of the connection between the prefabricated photovoltaic support foundation and the photovoltaic support.

[0036] Figure 6 Schematic diagram of the installation of edge photovoltaic panels and secondary purlins.

[0037] Figure 7 Schematic diagram of the installation of the central photovoltaic panel and secondary purlin.

[0038] Figure 8 This is a plan view of the installation of photovoltaic panels on a photovoltaic bracket.

[0039] Fig. 9 This is a schematic diagram of the cross section of the main purlin and secondary purlin.

[0040] In the figure: 1. Photovoltaic bracket; 101. Main purlin; 111. Connecting plate; 102. First purlin; 103. Second purlin; 104. Clamping assembly; 141. Side pressure block; 142. Middle pressure block; 143. Hexagonal bolt; 144. Positioning nut; 2. Prefabricated photovoltaic bracket foundation; 201. Embedded parts; 202. Reserved sockets; 3. Concrete roof; 301. Main structural layer of floor slab; 302. Main reinforcement of floor slab; 4. L-shaped embedded anchor reinforcement; 5. Polymer cement mortar protective layer; 6. Photovoltaic panel. DETAILED DESCRIPTION

[0041] The technical solutions in the embodiments of the present invention will be fully illustrated and described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0042] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "two ends", "middle" 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 position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0043] Example 1, please refer to Figure 2-Figure 4 .

[0044] The present embodiment provides a prefabricated concrete roof structure based on photovoltaic building integration, which is one of the preferred embodiments of the present utility model, including a prefabricated photovoltaic bracket foundation 2 and embedded anchor bars; the lower end of the embedded anchor bars is buried in the concrete roof 3, and the upper end is exposed; the prefabricated photovoltaic bracket foundation 2 adopts a reinforced concrete structure, and an embedded part 201 is provided on the top, and the embedded part 201 is a pre-embedded steel plate. A reserved hole 202 that penetrates the concrete and the embedded part 201 is provided in the prefabricated photovoltaic bracket foundation 2, and the upper end of the embedded anchor bar is inserted into the reserved hole 202 and connected with the concrete and the embedded part 201.

[0045] The embedded anchor bar is set in an L shape, preferably a threaded steel bar. The bending part of the L-shaped embedded anchor bar 4 overlaps the main reinforcement 302 of the floor slab in the concrete roof 3. The vertical part of the L-shaped embedded anchor bar 4 is used to fix the prefabricated photovoltaic bracket foundation 2, and the bending part is used to increase the connection interface and the foundation strength after pouring. The embedded part 201 is connected to the embedded anchor bar by perforation plug welding. The height difference between the prefabricated photovoltaic bracket foundation 2 and the concrete roof 3 is not less than 200mm, preferably 500mm; the outermost layer of the prefabricated photovoltaic bracket foundation 2 and the concrete roof 3 is paved with a polymer cement mortar protective layer 5 to enhance waterproofing.

[0046] The L-shaped embedded anchor bars 4 are tied together with the main reinforcement bars 302 of the floor slab, and then poured into the integral roof slab. After the embedded construction is completed, the prefabricated photovoltaic support foundation 2 is assembled. The prefabricated photovoltaic support foundation 2 is a prefabricated reinforced concrete component with a reserved socket 202 in the middle. After the L-shaped embedded anchor bar 4 is inserted, concrete mortar is poured to fill the gap between the L-shaped embedded anchor bar 4 and the reserved socket 202, so that the L-shaped embedded anchor bar 4 is connected to the concrete in the prefabricated photovoltaic support foundation 2; an embedded part 201 for connecting the main purlin 101 is embedded on the top of the prefabricated photovoltaic support foundation 2 (the embedded part 201 also needs to be fixed with anchor bars, which is common knowledge in the field), the center point of the embedded part 201 is aligned with the center point of the embedded anchor bar, and a reserved socket 202 is also provided in the center of the embedded part 201. When the embedded anchor bar passes through the concrete to the embedded part 201, the embedded anchor bar is welded to the embedded part 201 by perforation plug welding, and the reserved socket 202 of the embedded part 201 is filled with solder, and the excess length of the embedded anchor bar is cut off so that the embedded anchor bar is flush with the upper surface of the embedded part 201. After the prefabricated photovoltaic support foundation 2 is firmly connected to the embedded anchor bar, a polymer cement mortar protective layer 5 is laid on the top surface of the prefabricated photovoltaic support foundation 2 and the concrete roof 3. For example, the polymer cement mortar produced by Beijing Rongdaxin New Technology Co., Ltd. can be used, and its components are quartz sand, cement, water reducing agent, preservative, binder, and glue powder. The upper finished surface of the prefabricated photovoltaic support foundation 2 should be no less than 300mm away from the finished surface of the concrete roof 3 to ensure the heat dissipation requirements of the photovoltaic system.

[0047] Example 2, please refer to Figure 1-9 .

[0048] The present embodiment provides a concrete roof photovoltaic support based on photovoltaic building integration, which is one of the preferred embodiments of the utility model, including two main purlins 101, two first purlins 102, two second purlins 103, and a plurality of buckling components 104. The two main purlins 101 are arranged parallel to the length direction of the photovoltaic panel 6, and their ends are respectively fixed on a plurality of prefabricated photovoltaic support foundations 2 arranged in a matrix. The two first purlins 102 are perpendicular to the main purlins 101, and are respectively connected to the two ends of the main purlins 101 through the buckling components 104. The two second purlins 103 are arranged parallel to the first purlins 102 and are connected to the middle of the main purlins 101 through the buckling components 104. The spacing between the two main purlins and the spacing between the first purlins and the second purlins are adjustable.

[0049] The lateral spacing between the two main purlins 101 is 4576-4656mm, preferably 4600mm; the longitudinal spacing between the two first purlins is 3800-4000mm; the longitudinal spacing between the first purlin 102 and the second purlin 103 is 1600-1700mm; the photovoltaic bracket 1 adopts a fixed modulus size, which is independent of snow load and wind load and will not be adjusted due to different loads. The spacing between the main purlins 101, the first purlins 102, and the second purlins 103 in the photovoltaic bracket 1 will not change, but the material thickness and size of the main purlins 101, the first purlins 102, and the second purlins 103 can be adjusted to adjust the strength to adapt to different loads.

[0050] The cross-sections of the main purlin 101, the first purlin 102 or the second purlin 103 are all concave in shape, and a notch is provided in the middle of the top along the length direction, and the notch is located inside the concave purlin; the clamping assembly 104 includes a pressing block, a fixing bolt, and a positioning nut 144, and the fixing bolt is a hexagonal bolt 143. The pressing block is clamped on the photovoltaic panel 6, and the positioning nut 144 is clamped in the notch of the first purlin 102 or the second purlin 103. The hexagonal bolt 143 passes through the pressing block and is screwed with the positioning nut 144, and the hexagonal bolt 143 is tightened to anchor the photovoltaic panel 6. A through hole is provided in the middle of the pressure block for the hexagonal bolt 143 to pass through, and the positioning nut 144 adopts a rectangular nut, that is, a circular screw hole matching the hexagonal bolt 143 is provided in the center of the rectangular plate, and the length of the rectangular nut is greater than the width of the notch of the first purlin 102 (or the second purlin 103), and the width is less than or equal to the width of the notch of the first purlin 120 (or the second purlin 103). The main purlin 101 is provided with a plurality of connecting plates 111, which are connected to the first purlin 102 or the second purlin 103, and the upper and lower sides of the connecting plates 111 are respectively connected to the main purlin 101 and the first purlin 102 (or the second purlin 103) by welding on all four sides; since the main purlin 101 also adopts a concave cross-section, the connecting plates 111 can play a role in auxiliary welding, thereby increasing the connection strength between the main purlin 101 and the secondary purlin (referring to the first purlin 102 and the second purlin 103). On the secondary purlin, the photovoltaic panel 6 is fastened to the secondary purlin by a pressing assembly 104 composed of a pressing block, a hexagonal bolt 143 and a positioning nut 144 to complete the installation of the photovoltaic panel 6. According to the different buckling positions of the buckling assembly 104, the pressing blocks are divided into two types: side pressing blocks 142 and side pressing blocks 141. For the edge positions of the secondary purlin and the photovoltaic panel 6, the photovoltaic panel 6 is fastened to the secondary purlin by using the side pressing blocks 141, hexagonal bolts 143 and positioning nuts 144; for the non-edge positions of the secondary purlin and the photovoltaic panel 6, the photovoltaic panel 6 is fastened to the secondary purlin by using the side pressing blocks 142, hexagonal bolts 143 and positioning nuts 144. Specifically, when installing the photovoltaic panel 6, first move the buckling assembly 104 to the required position, rotate the positioning nuts 144 until the length direction is the same as the length direction of the secondary purlin, then insert the positioning nuts 144 into the inside of the secondary purlin and rotate until the length direction is perpendicular to the length direction of the secondary purlin, and then tighten the hexagonal bolts 143 to fasten the photovoltaic panel 6 to the secondary purlin.

[0051] After the construction of the prefabricated photovoltaic support foundation 2 is completed, the main purlin 101, the first purlin 102, and the second purlin 103 are placed on the embedded parts 201 of the prefabricated photovoltaic support foundation 2, and the main purlin 101 and the embedded parts 201 are connected by four-sided welding to finally form a complete concrete roof photovoltaic support structure.

[0052] When there are multiple photovoltaic brackets 1, the multiple photovoltaic brackets 1 are arranged continuously in the transverse direction, that is, the photovoltaic brackets 1 arranged adjacent to each other in the transverse direction can share the same main purlin 101, and the spacing between the photovoltaic brackets 1 arranged in the longitudinal direction is 500-1200 mm, preferably 800 mm.

[0053] For specific example 1, please refer to Figure 1 — Fig. 9 .

[0054] The position determination of the embedded parts 201 of the photovoltaic bracket of the utility model introduces the concept of modulus and modular matrix. The matrix length is based on the general width of the photovoltaic panel 6, 1134mm. In the prior art, the installation spacing of the photovoltaic panel 6 can be 5mm to 200mm, which is a large range. The utility model is preferably 10-30mm, and preferably 1144-1164mm is taken as the horizontal spacing modulus of a single photovoltaic panel 6 in the matrix length range. The determination of the horizontal spacing of the photovoltaic panel 6 is mainly affected by the thermal expansion and contraction of the photovoltaic panel 6, while also taking into account the economy. The matrix width refers to the length of the mainstream photovoltaic panel 6 of about 1700mm-2200mm. Since the length is not a fixed value, the maximum overhang of the photovoltaic panel 6 allowed by the secondary purlin structure calculation in the prior art can be 0-1000mm, which has a large range. The utility model preferably uses 300mm. The spacing between the first purlin 102 and the second purlin 103 in the prior art can be 1200-2000mm, which has a large range. The utility model preferably uses 1600-1700mm, plus the two sides preferably overhang 300mm, that is, 2200-2300mm is preferably taken as the longitudinal spacing modulus of a single photovoltaic panel 6 in the matrix width range. According to the matrix size, the weight of the photovoltaic panel 6, the structural safety and economic optimization calculation and the auxiliary building effect simulation, it is determined that each photovoltaic bracket 1 is provided with two rows (horizontally) and four columns (vertically) with a total of eight photovoltaic panels 6, and 4576-4656mm (1144mm*4=4576mm, 1164mm*4=4656mm) is taken as the matrix standard length reference value (horizontally), 4600mm is taken as the preferred reference value of the matrix standard length, and 4400-4600mm (2200mm*2=4400mm, 2300mm*2=4600mm) is taken as the matrix standard width reference value (vertically). Since the wide sides of the matrix contain 600mm of overhanging space, the installation width (i.e., longitudinal spacing) of the two first purlins 102 is 3800-4000mm. Therefore, the standard size of the photovoltaic bracket 1 is (3800-4000) mm*(4576-4656) mm. Different photovoltaic brackets 1 are arranged continuously in the horizontal direction, and the longitudinal spacing is 500-1200 mm, preferably 800 mm. The longitudinal spacing mainly considers the overhanging length of the photovoltaic panel 6 and the width of the artificial channel. The corner point position of the photovoltaic bracket 1 is the installation position of the prefabricated photovoltaic bracket foundation 2. Then, according to the local snow load and wind pressure value, the material thickness and size of the main purlin 101 and the secondary purlin, the diameter of the L-shaped anchor bar 4, the lap length and other parameters are determined.

[0055] refer to Figure 8In a preferred embodiment, the current standard width of the photovoltaic industry is 1134mm. It is preferred that the longitudinal spacing between the first purlin 102 and the second purlin 103 is 1700mm, and the two sides are cantilevered by 300mm. Then the total length of the single module is 1700+300+300=2300mm. Two modules form a matrix, and the total length of the matrix is ​​4600mm. This size can adapt to the current mainstream photovoltaic panels 6 with a length of 1700mm-2300mm, and can also adapt to photovoltaic panels 6 with a length of 2300-2400mm, which can take into account the project economy and photovoltaic power generation to the greatest extent. For a single module with a total length of 2300mm, taking 2100mm and 2400mm as examples, for a 2100mm photovoltaic panel 6, it is placed in the middle of the midline position between the first purlin 102 and the second purlin 103 of the two longitudinal modules, and then the two sides are cantilevered by 200mm. For 2400mm photovoltaic panels 6, two photovoltaic panels 6 are placed adjacent to each other and centered on the midline between the two longitudinal modules. The matrix has 400mm overhangs on both sides in the longitudinal direction, and another 100mm overhangs outside the outermost overhanging range at the upper and lower ends of the first purlin 102 in the longitudinal direction. When the longitudinal spacing of the photovoltaic bracket is 700-1200mm, the requirements can basically be met.

[0056] During the construction of the building roof, according to the position of the prefabricated photovoltaic support foundation 2 determined by the preliminary calculation, the L-shaped pre-buried anchor bar 4 is placed in advance when laying the roof slab reinforcement. The L-shaped pre-buried anchor bar 4 is divided into an upper vertical part for future fixing of the support foundation, and a lower bend for increasing the firmness of the foundation. In this embodiment, the lower bend of the L-shaped pre-buried anchor bar 4 only needs to be hooked on the main reinforcement 302 of the floor slab. Figure 2 As shown, after the L-shaped embedded anchor bar 4 is completed, the main structure layer 301 of the floor slab is cast, and the slope layer, leveling layer, insulation layer, leveling layer, waterproof layer, isolation layer and decorative surface layer are laid on the main structure layer 301 of the floor slab in sequence to form a concrete roof 3. The L-shaped embedded anchor bar and the concrete roof 3 are integrally formed in construction, and have good strength, waterproofness and thermal insulation performance. The cross section of the prefabricated photovoltaic support foundation 2 is square, with a side length of 100-400mm, preferably 200mm, and a height of 400-600mm, preferably 500mm.

[0057] Compared with the existing "preliminary scheme of using embedded parts on the concrete roof and one-time forming of photovoltaic brackets", the utility model has the following advantages:

[0058] 1. The embedded parts positioning method of the concrete roof photovoltaic bracket described in the utility model can be integrated with the building roof without determining the photovoltaic panel product, and can be adapted to most mainstream roof crystalline silicon module photovoltaic products, solving the problem of mismatch between photovoltaic construction and civil construction periods, and greatly improving work efficiency.

[0059] 2. The modular matrix photovoltaic bracket described in the utility model can calculate the structural load in advance, and comprehensively calculate the size of the photovoltaic bracket matrix, the weight of the photovoltaic panels, and the snow load and wind pressure in the area to obtain the optimal material solution for the photovoltaic bracket, thereby greatly reducing the cost of the photovoltaic bracket.

[0060] 3. The load-bearing support of the photovoltaic bracket foundation described in the utility model is based on the pre-buried anchor bars directly connected to the steel bars of the building roof, which requires less materials, has light load, high stability, and will not damage the roof waterproofing layer, with excellent comprehensive benefits.

[0061] 4. The modular matrix photovoltaic bracket described in the utility model only needs to reserve steel plates for civil construction, and the bracket installation can be completed by welding when the photovoltaic panels are installed. The construction is convenient and can greatly save labor costs.

[0062] Compared with the existing "later scheme of making a photovoltaic bracket on the concrete roof", the utility model has the following advantages in addition to the above advantages:

[0063] The embedded anchor bar of the utility model, whose protective sleeve is arranged in the prefabricated photovoltaic bracket foundation, is a prefabricated assembled reinforced concrete part, which can be manufactured in advance, and the construction is simple and fast, with less materials, light load, high stability, and will not damage the roof waterproof layer, with excellent comprehensive benefits.

[0064] The above description is only used to illustrate the technical solution of the utility model and is not intended to limit it. Any modifications or substitutions made to the technical solution by other technicians in this professional field should be included in the scope of the claims of the utility model as long as they do not deviate from the connotation of the technical solution of the utility model.

Claims

1. The prefabricated concrete roof structure based on photovoltaic building integration is characterized by: It includes a prefabricated photovoltaic bracket foundation and embedded anchor bars; the lower end of the embedded anchor bars is buried in the concrete roof and the upper end is exposed; the prefabricated photovoltaic bracket foundation adopts a reinforced concrete structure, and embedded parts are arranged on the top; the prefabricated photovoltaic bracket foundation is provided with a reserved hole that penetrates the concrete and the embedded parts, and the upper end of the embedded anchor bars is connected to the concrete and the embedded parts after being inserted into the reserved hole.

2. The prefabricated concrete roof structure according to claim 1, characterized in that: The pre-buried anchor bar is arranged in an L shape, and the bending part of the pre-buried anchor bar overlaps with the main bar in the concrete roof.

3. The prefabricated concrete roof structure according to claim 1, characterized in that: The embedded anchor bar is connected to the embedded part by means of perforation plug welding, and concrete mortar is filled between the embedded anchor bar and the concrete in the prefabricated photovoltaic support foundation.

4. The prefabricated concrete roof structure according to claim 1, characterized in that: The height difference between the prefabricated photovoltaic support foundation and the concrete roof is not less than 200 mm; a polymer cement mortar protective layer is laid on the outermost layer of the prefabricated photovoltaic support foundation and the concrete roof.

5. A concrete roof photovoltaic support based on photovoltaic building integration, comprising two main purlins, two first purlins, two second purlins, and a plurality of clamping assemblies, wherein the two main purlins are arranged parallel to the length direction of the photovoltaic panel, and their ends are fixed on the embedded parts of the prefabricated photovoltaic support foundation as described in any one of claims 1 to 4, and a plurality of prefabricated photovoltaic support foundations are arranged in a matrix; the two first purlins are perpendicular to the main purlins and are respectively connected to the two ends of the main purlins through the clamping assemblies, the two second purlins are arranged parallel to the first purlins and are connected to the middle of the main purlins through the clamping assemblies, and the spacing between the two main purlins and the spacing between the first purlins and the second purlins are adjustable.

6. The concrete roof photovoltaic bracket according to claim 5, characterized in that: The cross sections of the main purlin, the first purlin or the second purlin are all in a concave shape, and a notch is arranged at the top along the length direction.

7. The concrete roof photovoltaic support according to claim 6, characterized in that: The pressing assembly includes a pressing block, a fixing bolt, and a positioning nut. The pressing block is pressed on the photovoltaic panel, the positioning nut is clamped in the notch of the first purlin or the second purlin, and the fixing bolt passes through the pressing block and is threadedly connected with the positioning nut.

8. The concrete roof photovoltaic support according to claim 5, characterized in that: The main purlin is provided with a plurality of connecting plates, and the plurality of connecting plates are connected to the first purlin or the second purlin.

9. The concrete roof photovoltaic bracket according to any one of claims 5 to 8, characterized in that: The transverse spacing between the two main purlins is 4576-4656 mm; the longitudinal spacing between the two first purlins is 3800-4000 mm; and the longitudinal spacing between the first purlin and the second purlin is 1600-1700 mm.

10. The concrete roof photovoltaic support according to claim 9, characterized in that: Different photovoltaic brackets are arranged continuously in the horizontal direction with a vertical spacing of 500-1200mm.

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