CN108365800B - Inhaul cable pre-pressing photovoltaic bracket - Google Patents

Abstract

The invention discloses a guy cable pre-pressing photovoltaic bracket, which comprises a longitudinal beam and/or a transverse beam used for paving a photovoltaic module, and further comprises a guy cable pre-pressing device which is arranged above the longitudinal beam and/or the transverse beam and used for fixing the photovoltaic module, wherein the guy cable pre-pressing device comprises a transverse cable, a longitudinal cable and a supporting rod, the transverse cable and the longitudinal cable are in a cross net shape and cover above the photovoltaic module, and two ends of the transverse cable and the longitudinal cable are provided with tightening adjusting devices; the bottom of the stay bar is hinged on the cross beam or the longitudinal beam, and the top of the stay bar is connected with the transverse cable or the longitudinal cable. The invention has the advantages that: the photovoltaic module is stable under the action of wind load on the premise of not damaging the roof and the waterproof layer of the original building and not influencing normal production work, and has the characteristics of light dead weight of the rod piece, large adaptation span, high structural efficiency, simple and convenient construction, repeated assembly and disassembly use and the like; the method can be applied to the installation of photovoltaic modules on various building roofs, and is not limited by roof plate materials and forms.

Description

Cable pre-compression photovoltaic bracket

Technical Field

The invention relates to a photovoltaic bracket, in particular to a cable pre-stressed photovoltaic bracket.

Background technique

Distributed photovoltaic power generation is a kind of green energy that is connected to the grid on the user side and used for self-use, and the surplus power is connected to the grid. It has been more and more widely used in recent years. One of the problems faced by large-scale installation of photovoltaic modules is how to ensure the overall stability of photovoltaic modules under the action of negative wind pressure. The existing photovoltaic bracket system usually uses special clips to connect the support to the roof, and then installs the photovoltaic modules on the longitudinal beam. This puts forward more stringent requirements on the appearance of the roof panel, which should generally be a snap-on or upright bite connection. In many cases, the roof does not have the conditions for connection with a clamp, such as a trapezoidal cross-section screw connection roof, glazed tile or cement tile roof, etc. In this case, only drilling, welding or gluing can be used. Obviously, this approach causes great damage to the original roof, and there are prominent problems such as poor waterproofing or durability, complex construction process, and high cost. This has restricted the development and application of distributed photovoltaic on the roof to a certain extent; in addition, traditional ground rigid brackets are counterweighted with concrete blocks to fix the bracket to the ground. The present invention provides a new idea to use prestressed cables to achieve the purpose of overall stability of photovoltaic modules.

Summary of the invention

Purpose of the invention: The purpose of the present invention is to provide a cable-prestressed photovoltaic bracket that does not damage the original building roof and ensures reliable connection between the photovoltaic component bracket and the roof.

Technical solution: A cable-prestressed photovoltaic bracket, comprising longitudinal beams and/or transverse beams for laying photovoltaic modules, the cable-prestressed photovoltaic bracket also includes a cable-prestressed device installed above the longitudinal beams and/or transverse beams for fixing the photovoltaic modules, the cable-prestressed device includes transverse cables, longitudinal cables and struts, wherein the transverse cables and longitudinal cables are in a cross-net-like cover above the photovoltaic modules, and tightening adjustment devices are provided at both ends of the transverse cables and longitudinal cables; the bottom of the strut is movably connected to the transverse beam or the longitudinal beam, and the top of the strut is connected to the transverse cable or the longitudinal cable.

The transverse cables and/or longitudinal cables are parabolic in shape.

In order to ensure that the cable prestressing device is more stable, the intersection of the transverse cable and the longitudinal cable is fixed to the node plate through a cable buckle, and the node plate is connected to the strut; preferably, the node plate is provided with a through hole for fixing the cable buckle, wherein the node plate is a steel plate of a certain thickness, with holes opened thereon for fixing the cable buckle, the bottom of the node plate is hinged to the top of the strut, or the bottom of the node plate is fixedly connected to the top of the strut.

The transverse cables and longitudinal cables may be one or more of corrosion-resistant galvanized steel wire ropes, stainless steel wire ropes, steel strands, steel wire bundles, and steel tie rods.

Preferably, the adjustment device may be a turnbuckle bolt or an adjustment sleeve.

Beneficial effects: Compared with the prior art, the advantages of the present invention are: it ensures the stability of photovoltaic modules under wind loads without destroying the waterproof layer of the original building and without affecting normal production work; it has the characteristics of light weight of the rod, large adaptability span, high structural efficiency, etc., can effectively save steel, improve construction speed, and has a high degree of on-site assembly, no need for large-scale mechanical auxiliary construction, and can realize the recycling of components, which belongs to green buildings; it can be applied to the connection between various roof panels and photovoltaic modules, and is not limited by the material and form of the roof panels.

BRIEF DESCRIPTION OF THE DRAWINGS

Fig. 1 is a schematic diagram of the structure of the present invention;

Fig. 2 is a cross-sectional view of the present invention;

FIG3 is a schematic diagram of a framework of the present invention;

FIG4 is a schematic diagram of the connection between the cable preloading device and the roof panel;

FIG. 5 is a schematic diagram showing the crossing position of the transverse cables and the longitudinal cables.

Detailed ways

The technical solution of the present invention is further described below in conjunction with the accompanying drawings.

As shown in Figures 1-4, a cable prestressed photovoltaic bracket includes a grid-shaped roof bracket device located at the bottom and a cable prestressed device located at the top. The grid-shaped roof bracket device includes a support 8, a longitudinal beam 6 and a cross beam 3 that match the roof form. The support 8 is connected to the longitudinal beam 6 by bolts. The longitudinal beam 6 and the cross beam 3 are orthogonally arranged in the longitudinal and transverse directions. The cross beam 3 is laid on the longitudinal beam 6. A clamp is provided on the longitudinal beam 6. The clamp is connected to the longitudinal beam 6 by bolts. One end of the clamp clamps the cross beam 3 and the other end clamps the photovoltaic module 5. The support 8 can be made into a support form that fits the roof panel 7 to adapt to different roof panel materials and shapes. The contact surface between the support 8 and the roof panel 7 can be processed to increase friction.

The cable prestressing device comprises a transverse cable 1, a strut 2 and a longitudinal cable 4. The transverse cable 1 is a corrosion-resistant galvanized steel wire rope, a stainless steel wire rope, a steel strand or a steel rod, and the longitudinal cable 4 is one or more of a corrosion-resistant galvanized steel wire rope, a stainless steel wire rope, a steel strand, a steel wire bundle and a steel rod; the transverse cable 1 and the longitudinal cable 4 are arranged crosswise, the bottom of the strut 2 is movably connected to the crossbeam 3, and the top of the strut 2 is connected to the transverse cable 1. The connection method here can be a fixed connection or a movable connection. As long as the top of the strut 2 can provide a counter pressure after being connected to the transverse cable, the purpose of the present invention can be achieved. Among them, the fixed connection can be welding, bolt connection and the like, and the movable connection can be hinged and the like. In order to better stabilize the cable prestressing device, the cross position of the transverse cable and the longitudinal cable is fixed to the node plate by a cable buckle 9 in this embodiment. On the top, the node plate is connected to the top of the support rod 2, and the cable buckle 9 can be a wire rope buckle, as shown in Figure 5, the intersection of the transverse cable 1 and the longitudinal cable 4 is arranged on the node plate, and the transverse cable 1 and the longitudinal cable 4 are fixed by the wire rope buckle. In this embodiment, two pairs of wire rope buckles are used to fix the transverse cable 1 and the longitudinal cable 4 respectively, and a variety of fixing methods can also be used; the bottom of the node plate is connected to the top of the support rod 2, and a movable connection or a fixed connection can be used here, wherein the fixed connection can be welded, bolted, etc., and the movable connection can be hinged; the end of the transverse cable 1 is connected to the crossbeam at the edge of the photovoltaic bracket through an adjusting device for adjusting the pre-tension of the cable, and the end of the longitudinal cable 4 is connected to the longitudinal beam at the edge of the photovoltaic bracket through an adjusting device for adjusting the pre-tension of the cable, wherein the adjusting device is a basket bolt or an adjusting sleeve.

Working principle: After the cable pre-stressed photovoltaic bracket is installed, the tightening adjustment device is operated to apply pre-tension to the transverse cable 1, and then the support 8 is forced to be close to the roof panel 7 through the support rod 2, wherein the transverse cable is the main force-bearing cable. When the pre-tension is applied, the support rod becomes an elastic support with axial pressure, which produces a pre-pressure perpendicular to the roof on the transverse beam and/or longitudinal beam; then the tightening adjustment devices at both ends of the longitudinal cable are operated to make the transverse cable and the longitudinal cable form a cross-net to more firmly cover the photovoltaic module, and will not separate from the roof panel under the action of wind load, thereby ensuring the overall stability of the photovoltaic module. Among them, the longitudinal cables are arranged at intervals and connected to the transverse cables and support rods at the nodes. They mainly play a stabilizing role to prevent the transverse cables and support rods from losing stability out of the plane.

The installation method of the cable pre-stressed photovoltaic bracket of the present invention comprises the following steps:

(1) Determine the support installation position on the roof by laying out, assemble the support and the longitudinal beam through accessories, and lay the cross beam at the corresponding position of the transverse cable to stabilize the structure and ensure that there is no relative slip between the longitudinal beam and the roof panel;

(2) Install the brace on the crossbeam or longitudinal beam through accessories;

(3) Place the transverse and longitudinal cables by means of a winch, connect the transverse cables to the struts at pre-marked positions, and pre-tighten them;

(4) Place the longitudinal cables. When using cable buckles, connect the longitudinal cables to the struts and pre-tighten them;

(5) After the transverse cable is pulled by the winch and reliably connected to the original main load-bearing structure, pre-tension is applied through the adjustment device. If the cable force is not large, pre-tension can be applied directly by tightening the end basket bolts. If the cable force is large, a hand winch or a small jack can be used for tensioning.

Claims (8)

1. A cable prestressing photovoltaic support, comprising longitudinal beams and/or transverse beams for laying photovoltaic modules, characterized in that it also comprises a support (8) matching the roof form, a cable prestressing device installed above the longitudinal beams and/or transverse beams and used to fix the photovoltaic modules, the cable prestressing device comprising a transverse cable (1), a longitudinal cable (4) and a strut (2), wherein the transverse cable (1) and the longitudinal cable (4) are in a cross-net-like manner and cover the photovoltaic modules, the bottom of the strut (2) is movably connected to the transverse beam or the longitudinal beam, and the top of the strut (2) is connected to the transverse cable (1) or the longitudinal cable (4); tightening adjustment devices are provided at both ends of the transverse cable (1) and the longitudinal cable (4), the tightening adjustment device applies pretension to the transverse cable (1) or the longitudinal cable (4), and provides counter pressure to the transverse beam or the longitudinal beam arranged on the roof panel (7) through the strut (2), forcing the support (8) to be in close contact with the roof panel (7). 2. The cable prestressed photovoltaic bracket according to claim 1, characterized in that the transverse cable (1) and/or the longitudinal cable (4) are parabolic. 3. The cable prestressed photovoltaic bracket according to claim 1, characterized in that the intersection of the transverse cable (1) and the longitudinal cable (4) is fixed to the node plate through a cable buckle, and the node plate is connected to the support rod (2). 4. The cable pre-stressed photovoltaic bracket according to claim 3 is characterized in that the node plate is provided with a hole for fixing the cable buckle. 5. The cable pre-stressed photovoltaic support according to claim 3, characterized in that the bottom of the node plate is hinged to the top of the support rod (2). 6. The cable pre-stressed photovoltaic bracket according to claim 3, characterized in that the bottom of the node plate is fixedly connected to the top of the support rod (2). 7. The cable preloaded photovoltaic bracket according to claim 1 is characterized in that the transverse cables (1) and the longitudinal cables (4) are one or more of corrosion-resistant galvanized steel wire ropes, stainless steel wire ropes, steel strands, steel wire bundles, and steel tie rods. 8. The cable pre-stressed photovoltaic bracket according to claim 1, characterized in that the adjustment device is a basket bolt or an adjustment sleeve.