A zero-disturbance large-span photovoltaic support structure based on prestressed cable truss

Abstract

The present invention discloses a zero-disturbance large-span photovoltaic support structure based on a prestressed cable truss, comprising columns and a cable system, wherein the columns are arranged in a matrix, the cable system comprises transverse cables and longitudinal cables, the transverse cables and longitudinal cables are connected to the columns, the transverse cables and longitudinal cables each have two layers, arranged up and down, and the transverse cables of the upper layer and the longitudinal cables of the upper layer are prestressed. The present invention can control the deformation magnitude of the photovoltaic support structure when the deadweight load condition is sheared into the wind and snow load condition, improve the rigidity of the photovoltaic support structure, and remove obstacles for the normal and safe use of photovoltaic components.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic power generation, and in particular to a zero-disturbance large-span photovoltaic support structure based on a prestressed cable truss. Background Art

[0002] With the vigorous development of the photovoltaic industry, in order to adapt to various complex installation environments such as mountains, water surfaces, and roofs, flexible brackets have gained more and more attention and applications due to their large span, high efficiency in utilizing the mechanical properties of materials, and low cost.

[0003] Photovoltaic modules bear gravity load, wind load and snow load, and transmit them to the cable structure. Most of the existing flexible support solutions are a combination of a single-layer cable structure system and a rigid frame / truss. Although they can bear the vertical gravity load and snow load of the module well, they are limited by the large vertical (deflection) structural form, and the ability to withstand negative wind pressure (wind acts on the bottom of the module to form an upward lifting force) is almost zero. The large vertical also affects the overall appearance of the project and brings certain interference to operation and maintenance (such as the application of photovoltaic robots); there are cost challenges and technical risks when the rigid frame / truss achieves a larger span, which affects the wider application of the system. At the same time, under the single-layer cable structure system, due to the force characteristics of the cable requiring a certain verticality, prestress cannot be applied; horizontal wind loads and pulsating wind pressures can often cause significant vibrations in the cable structure system, including flutter and galloping; in severe cases, it may even cause damage.

[0004] like Figure 1 As shown, the typical structure of the existing flexible support includes a column 3, a north-south rigid frame (truss / steel beam) and an east-west single-layer cable structure system. Similar to a general simple suspension bridge, the component 9 is suspended between two parallel cables 8.

[0005] The prior art has the following disadvantages:

[0006] 1. The structure cannot resist negative wind (wind pressure in the opposite direction of weight);

[0007] 2. The structure is prone to wind-induced vibrations, including flutter, galloping and torsional vibrations;

[0008] 3. Prestressing cannot be applied, and the initial stress is generated only by deadweight. Under the action of wind and snow loads, the structure deforms greatly, which can easily cause damage such as component shedding, cracking, and hidden cracks;

[0009] 4. The economic span in the north-south direction is limited;

[0010] 5. The mid-span deflection is large, which results in a poor overall appearance of the project compared to the traditional rigid support solution. Summary of the invention

[0011] The present invention aims to provide a zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses, which can control the deformation magnitude of the photovoltaic support structure when the self-weight load condition is sheared into the wind and snow load condition, improve the stiffness of the photovoltaic support structure, and remove obstacles for the normal and safe use of photovoltaic modules.

[0012] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0013] The invention discloses a zero-disturbance large-span photovoltaic support structure based on a prestressed cable truss, comprising columns and a cable system, wherein the columns are arranged in a matrix, and the cable system comprises transverse cables and longitudinal cables, wherein the transverse cables and the longitudinal cables are connected to the columns, and the transverse cables and the longitudinal cables each have two layers, which are arranged up and down, and prestress is applied to the transverse cables of the upper layer and the longitudinal cables of the upper layer.

[0014] Preferably, transverse cables are connected between the columns adjacent to each other in the transverse direction, and longitudinal cables are connected between the columns adjacent to each other in the longitudinal direction. The transverse cables and longitudinal cables are connected to the columns via anchors and adjustable struts or non-adjustable struts.

[0015] Furthermore, a support rod is arranged between the two layers of transverse cables.

[0016] Preferably, the distance between adjacent transverse columns is 30m to 80m, the distance between adjacent longitudinal columns is 10m to 80m, and there are no less than two transverse cables in the lower layer.

[0017] Preferably, there are two transverse cables in the lower layer and one transverse cable in the upper layer, and the transverse cables in the lower layer and the transverse cables in the upper layer form a triangular strut structure with the connecting struts of the same column.

[0018] Preferably, the longitudinal cables of the upper layer are arranged horizontally, the longitudinal cables of the upper layer are connected to the transverse cables of the upper layer in a U-shaped connection manner, and the longitudinal cables of the lower layer are connected to the triangular brace structure.

[0019] Preferably, the deflection of the lower layer's transverse cables and the lower layer's longitudinal cables is 1 / 15 to 1 / 25.

[0020] Furthermore, the present invention also includes a U-bolt for installing a photovoltaic module.

[0021] Preferably, the columns located at the edge are of "A"-shaped structure, which are cast-in-place reinforced concrete structure, PHC pipe pile / annular prestressed pole and steel structure combination structure or steel structure; other columns are PHC pipe pile, annular prestressed pole or cast-in-place reinforced concrete columns.

[0022] Preferably, the lower transverse cables are anchored to the columns.

[0023] The present invention utilizes a prestressed double-layer cable system to better solve some typical problems of the flexible support in application.

[0024] In particular, by applying prestress, the deformation magnitude of the existing structure when the self-weight load condition is sheared into the wind and snow load condition is controlled, and the rigidity of the structure is improved, thereby removing obstacles for the normal and safe use of the components; by unloading / loading the component installation cables (stabilizing cables of the east-west cable trusses), the installation plane of the components is guaranteed; the stabilizing cables also have a good inhibitory effect on deformation and vibration under negative wind. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A typical structural diagram of a flexible bracket in the prior art;

[0026] Figure 2 This is the general plan view of the present invention;

[0027] Figure 3 It is a schematic diagram of the cable net of the present invention;

[0028] Figure 4 This is a structural diagram of a single-span north-south main load-bearing cable truss;

[0029] Figure 5 for Figure 4 Schematic diagram of 1A-1A and 1B-1B directions;

[0030] Figure 6 This is a schematic diagram of the end structure of the north-south main load-bearing cable truss;

[0031] Figure 7 This is a schematic diagram of the east-west cable truss structure;

[0032] Figure 8 for Figure 7 Schematic diagram of the 2A-2A direction;

[0033] Fig. 9 It is a structural diagram of the "A"-shaped column at the end;

[0034] Fig.10 This is a schematic diagram of photovoltaic panel installation; DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0036] The invention provides a zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses, such as Figure 2 As shown, it is composed of a column 3, a double-layer cable system arranged in longitude and latitude on the plane, an adjustable strut or a non-adjustable strut connecting the double-layer cable system, and an anchor; the double-layer cable system includes a north-south cable 1 and an east-west cable 2, which can and is recommended to be deployed continuously in north-south and east-west multiple spans, and the north-south direction is defined as the horizontal direction and the east-west direction as the longitudinal direction.

[0037] The columns 3 are divided into two types: end columns and middle columns. The middle columns bear the loads of the two adjacent span cables at the same time, and the combined loads mainly form vertical loads. The end columns are located at the outer edge of the array and mainly bear the vertical loads and horizontal loads transmitted by the single-side cables. The middle columns can be PHC piles, annular prestressed poles, cast-in-place reinforced concrete columns, etc. Fig. 9 As shown, the end column adopts an "A"-shaped structure, which can be realized by cast-in-place reinforced concrete or PHC pipe piles / annular prestressed poles and steel structure combination or steel structure system, and is fixed to the bottom plate 5 by anchor plates 31. The column spacing (cable span) can be 10m to 80m in the east-west direction and 30m to 80m in the north-south direction.

[0038] like Figure 3 As shown, the cable net is composed of north-south main load-bearing cable trusses and east-west secondary load-bearing cable trusses.

[0039] like Figure 4 As shown, the main north-south load-bearing cable trusses are arranged parallel to the north-south direction between adjacent columns. One span is arranged between every two columns, and each span is composed of two layers of at least two cable bodies arranged up and down, and a brace structure between the cable bodies to form a cable truss. Among them, the north-south upward layer cable 11 is a stabilizing cable, and the north-south downward layer cable 12 is a load-bearing cable. The north-south upward layer cable 11 is arranged horizontally, and transmits its own weight and upper load to the lower layer load-bearing cable through the support rod 4; the north-south upward layer cable 11 should be prestressed to increase the structural stiffness and reduce the natural vibration period to cope with wind-induced vibration. The deflection of the north-south downward layer cable 12 can be controlled at 1 / 15 to 1 / 25.

[0040] like Figure 5 , Figure 6 As shown, considering the torsional vibration and instability risk of the north-south main load-bearing cable trusses, there should be no less than 2 load-bearing cables, which should be anchored to the columns in a straight line with the main load-bearing cables; forming a typical equilateral triangle bracing system 6 of single-span main load-bearing cables.

[0041] like Figure 7 , Figure 8As shown, the east-west secondary load-bearing cable trusses are arranged parallel to each other in the east-west direction between the adjacent north-south cable trusses, thereby forming a spatial cable net structure. Each span of the east-west secondary load-bearing cable trusses is composed of at least two cable bodies arranged in two layers, and the brace structure between the cable bodies. Among them, the east-west upward layer cable 21 is a stabilizing cable (negative wind cable), and the east-west downward layer cable 22 is a load-bearing cable. The east-west upward layer cable 21 is arranged horizontally and connected to the north-south cable system stabilizing cable by a U-shaped connection (JGJ257-2012), and transmits its own weight and upper load to the east-west downward layer load-bearing cable through the brace system; the east-west upward layer cable 21 applies prestress to improve the structural stiffness and reduce the natural vibration period to cope with wind-induced vibration. The deflection of the east-west downward layer cable 22 can be controlled to be arranged at 1 / 15 to 1 / 25, and the span end transmits the load to the bearing cable system of the north-south cable system through the triangular brace structure of the north-south cable system, forming a typical inverted triangle brace system 7 of three-span secondary load-bearing cables.

[0042] like Fig.10 As shown, U-bolts are used to install and fix the photovoltaic module 9 in the plane 10 of the east-west cable truss stabilizing cable. The cable (tie rod) integrates a length adjustment mechanism in the form of a screw jack and has a self-locking function. During operation, if the cable is loose, the prestress can be further applied by adjusting the cable (tie rod).

[0043] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, technicians familiar with the field may make various corresponding changes and deformations based on the present invention, but these corresponding changes and deformations should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. A zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses, characterized by: It includes columns and cable systems, wherein the columns are arranged in a matrix, and the cable system includes transverse cables and longitudinal cables, wherein the transverse cables and longitudinal cables are connected to the columns, and the transverse cables and longitudinal cables each have two layers, which are arranged up and down, and the transverse cables of the upper layer and the longitudinal cables of the upper layer are prestressed; Transverse cables are connected between the columns adjacent to each other in the transverse direction, and longitudinal cables are connected between the columns adjacent to each other in the longitudinal direction. The transverse cables and longitudinal cables are connected to the columns through anchors and adjustable struts or through anchors and non-adjustable struts. A support rod is arranged between the two layers of transverse cables. The lower layer has no less than two transverse cables, which are anchored to the columns in a straight line with the main load-bearing cables. The upper layer has one transverse cable, and the lower and upper transverse cables and the support rod of the same column form an equilateral triangle support rod system. The longitudinal cables of the upper layer are arranged horizontally, the longitudinal cables of the upper layer are connected to the transverse cables of the upper layer in a U-shaped connection, and the longitudinal cables of the lower layer are connected to the triangular bracing structure; The longitudinal cable span ends transfer the load to the load-bearing cable system of the transverse cable system through the triangular strut structure of the transverse cable system, forming the three-span secondary load-bearing cables of the inverted triangular strut system.

2. According to claim 1, the zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses is characterized by: The distance between adjacent transverse columns is 30m to 80m, and the distance between adjacent longitudinal columns is 10m to 80m.

3. According to claim 1, the zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses is characterized by: The deflection of the lower transverse cables and the lower longitudinal cables is 1 / 15 to 1 / 25.

4. The zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses according to claim 1 is characterized in that: Also included are U-bolts for mounting PV panels.

5. According to claim 1, the zero-disturbance large-span photovoltaic support structure based on prestressed cable trusses is characterized by: The columns at the edge are "A"-shaped structures, which are cast-in-place reinforced concrete structures, PHC pipe piles / annular prestressed poles and steel structure combinations, or steel structures; the other columns are PHC pipe piles, annular prestressed poles or cast-in-place reinforced concrete columns.

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