Grid structure system for photovoltaic panel support

Abstract

The invention belongs to the field of photovoltaic technology, and particularly relates to a grid structure system for photovoltaic panel supporting, which comprises a supporting upright post, a diagonal draw bar, a supporting seat and a grid structure, the lower ends of the supporting stand columns are supported on the ground, and the diagonal draw bars are connected between the adjacent supporting stand columns. The grid structure is formed by connecting an upper chord member, a lower chord member, a web member and a bolt; a plurality of connecting nodes are arranged on the upper chord members, the web members and the lower chord members; the rod pieces are fixedly connected at the corresponding connecting nodes; the supporting seat comprises a U-shaped head and a vertical plate, and the U-shaped head is fixedly connected to the upper end of the vertical plate; a through hole and a threaded hole are respectively formed in two ends of the U-shaped head; the grid structure and the upper end of the supporting stand column are fixed through a supporting base. Through innovation of the structural system in the scheme, the unit steel consumption and the foundation number are reduced, and then the cost is reduced. Meanwhile, the supporting seat can greatly increase the bearing capacity of the joint, the universality is high, the types of rod pieces are reduced, and the production and installation difficulty is lowered.

Description

Technical Field

[0001] The invention belongs to the technical field of photovoltaics, and in particular relates to a grid structure system for supporting photovoltaic panels. Background Art

[0002] In existing photovoltaic power stations, photovoltaic panels need to be at a certain distance from the ground and maintain a certain angle with the ground to meet the use requirements. The traditional photovoltaic power station fixed rigid support is generally composed of columns, inclined beams, purlins, struts, tie rods and bolts, but this structure has the following main problems:

[0003] 1. In order to control costs, the optimal cross-section of components needs to be designed individually according to different load conditions, which is not very universal. In areas with large wind loads, the cost increases significantly.

[0004] 2. The economic span is 3 to 5 meters, which is not suitable for larger spans.

[0005] 3. The overall rigidity is insufficient. The components must be installed on-site by workers. It is difficult to improve quality and efficiency through pre-installation. The overall rigidity is insufficient, and the resistance to strong gusts of wind at the earthquake level is low. The bracket is easily twisted, which in turn damages the photovoltaic panels.

[0006] 4. There are many types of components and the installation logic is complex; the quality of structural installation is greatly affected by the skill level of personnel and high requirements are placed on technical personnel.

[0007] 5. The purlins are mainly made of C-shaped open profiles, with both the inner and outer sides exposed to the environment. Dust and water are easily accumulated on the inner side of the C-shaped purlins, and the material is easily corroded. Summary of the invention

[0008] In order to solve the above problems existing in the prior art, the present invention provides a grid structure system for supporting photovoltaic panels.

[0009] The technical solution adopted by the present invention is:

[0010] A grid structure system for supporting photovoltaic panels, comprising supporting columns, inclined rods, supporting seats and grid structures;

[0011] The lower end of the supporting column is supported on the ground, and the supporting column includes a long column and a short column, and the upper end of the long column is higher than the short column;

[0012] The diagonal tie rod is connected between adjacent supporting columns;

[0013] The grid structure is formed by connecting an upper chord, a lower chord, a web and bolts; the upper chord and the lower chord are provided with a plurality of connection nodes; the web is V-shaped, and the middle and ends of the web are provided with connection nodes; the upper chords that cross each other, the lower chords that cross each other, the web and the lower chord, and the web and the upper chord are fixedly connected at the corresponding connection nodes; the connection nodes are flat structures with holes in the middle;

[0014] The support seat includes a U-shaped head and a vertical plate, the U-shaped head is fixedly connected to the upper end of the vertical plate, and the U-shaped mouth of the U-shaped head faces the side of the support seat; through holes and threaded holes are respectively provided at both ends of the U-shaped head; the connection node of the grid structure is placed in the U-shaped mouth, and the support seat is fixedly connected to the grid structure by screws passing through the through holes, threaded holes and connection nodes; the vertical plate and the upper ends of the supporting columns are fixed by installing bolts.

[0015] As an alternative or supplement to the above-mentioned grid structure system: the connection node set on the upper chord is the upper chord node, and the upper chord is divided into an upper cross bar and an upper longitudinal bar; the upper cross bar and the upper longitudinal bar are cross-connected at the upper chord node; the connection node set at the end of the web member is the web member end node, and the bolts passing through the web member end node and the upper chord node fix the web member and the upper chord.

[0016] As an alternative or supplement to the above-mentioned grid structure system: at the connection between the web member and the upper chord member, a plurality of web member end nodes and a plurality of upper chord member nodes are vertically overlapped and vertically penetrated by bolts to achieve a fixed connection.

[0017] As an alternative or supplement to the above-mentioned grid structure system: the connection nodes on the lower chord are several lower chord nodes, and the lower chord is divided into a lower cross bar and a lower longitudinal bar; the lower cross bar is located below the gap between two adjacent upper cross bars; the lower longitudinal bar is located below the gap between two adjacent upper longitudinal bars; the lower cross bar and the lower longitudinal bar are cross-connected at the lower chord node; the connection node set in the middle of the web member is the middle node of the web member, and the bolts passing through the middle node of the web member and the node of the lower chord fix the web member and the lower chord and pass through.

[0018] As an alternative or supplement to the above-mentioned grid structure system: at the connection between the web member and the lower chord member, the middle node of the web member and multiple lower chord member nodes are vertically overlapped and vertically penetrated by bolts to achieve a fixed connection.

[0019] As an alternative or supplement to the above-mentioned grid structure system: two mutually intersecting web members are connected at the nodes of the lower chords, and the middle nodes of the web members of the two web members are vertically overlapped and connected; the projection of the grid structure on the horizontal plane is in the shape of a cross-shaped grid; the projection of the structure after several upper chords are connected on the horizontal plane is in the shape of a field grid; the projection of the structure after several lower chords are connected on the horizontal plane is in the shape of a field grid.

[0020] As an alternative or supplement to the above-mentioned grid structure system: the web member includes a first oblique rod segment and a second oblique rod segment, and the first oblique rod segment and the second oblique rod segment are divided into an eight-shaped section; the middle node of the web member is arranged between the first oblique rod segment and the second oblique rod segment, and the ends of the first oblique rod segment and the second oblique rod segment are both provided with web member end nodes.

[0021] As an alternative or supplement to the above-mentioned grid structure system: the upper chord, lower chord and web are processed from solid or hollow rods; different parts of the upper chord are flattened and punched by mechanical equipment to form upper chord nodes; different parts of the lower chord are flattened and punched by mechanical equipment to form lower chord nodes; the middle part of the web is flattened, punched and bent by mechanical equipment to form a middle node of the web; the ends of the web are flattened, punched and bent by mechanical equipment to form end nodes of the web.

[0022] As an alternative or supplement to the above-mentioned grid structure system: the two side arms of the U-shaped head are an upper arm and a lower arm, and the upper arm is located above the lower arm; the free ends of the upper arm and the lower arm are both provided with end seats, the through hole is provided on the end seat of the upper arm, and the threaded hole is provided on the end seat of the lower arm, and the center line of the through hole coincides with the threaded hole; the upper edge of the vertical plate is fixedly connected to the lower arm; an avoidance opening is provided on the upper edge of the vertical plate, and the avoidance opening is opposite to the threaded hole to accommodate the screw passing through the threaded hole; a mounting hole is provided at the lower part of the vertical plate.

[0023] As an alternative or supplement to the above-mentioned grid structure system: the U-shaped head is welded to the vertical plate or cast as one piece; the diameter of the through hole is 0.5 to 3 mm larger than the threaded hole; the depth of the avoidance opening is 0.5 to 20 mm; a flat head is provided at the upper end of the supporting column, and the flat head is connected to the vertical plate by mounting bolts.

[0024] The beneficial effects of the present invention are:

[0025] 1. This scheme uses circular rods to assemble a grid structure. Generally, it is not necessary to design the optimal cross-section of the components according to different load conditions. It has strong versatility. In areas with large wind loads, it can also achieve significant cost control.

[0026] Water is not easy to accumulate on the surface of each rod, which reduces the corrosion rate of the material.

[0027] 2. The grid structure of this solution is a three-dimensional frame with high structural strength, and can be designed with a larger span between the support pillars when installed;

[0028] 3. This solution has a small number of components and does not require complex processes such as welding. Only bolts and screws are needed to achieve quick connection between the components. Some components can be pre-installed and then installed at the designated location, which effectively improves the installation quality and efficiency. At the same time, it has lower skill requirements for technicians and is easy to meet the conditions for simultaneous assembly by multiple people. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below.

[0030] Figure 1 It is a side view of the grid structure system in this scheme;

[0031] Figure 2 It is a three-dimensional diagram of the grid structure in this scheme;

[0032] Figure 3 It is a top view of the grid structure in this scheme;

[0033] Figure 4 It is a side view of the grid structure in this scheme;

[0034] Figure 5 It is a schematic diagram of the structure of the upper chord;

[0035] Figure 6 It is a schematic diagram of the structure of the belly bar;

[0036] Figure 7 (a) and (b) are the state diagrams before and after the web member end node is connected;

[0037] Figure 8 (a) and (b) are the state diagrams before and after the middle node of the web member is connected;

[0038] Fig. 9 It is a three-dimensional structural diagram of the support base of the grid structure in this scheme;

[0039] Fig.10 It is a side view of the support base of the grid structure in this scheme;

[0040] Fig.11 This is a diagram showing the use status of the support base of the grid structure in this solution;

[0041] Fig.12 It is a structural diagram of another type of web structure.

[0042] In the figure: 1-upper chord; 1a-upper crossbar; 1b-upper longitudinal bar; 101-upper chord node; 2-lower chord; 2a-lower crossbar; 2b-lower longitudinal bar; 3-web member; 301-middle node of web member; 302-first diagonal bar section; 303-second diagonal bar section; 304-end node of web member; 4-screw; 5-nut; 6-gasket; 7-support column; 8-diagonal tie rod; 9-support seat; 901-U-shaped head; 902-end seat; 903-through hole; 904-threaded hole; 905-avoidance; 906-vertical plate; 907-mounting hole; 10-photovoltaic panel; 11-mounting bolt. DETAILED DESCRIPTION

[0043] The technical solution in this embodiment will be clearly and completely described below in conjunction with the accompanying drawings. The described embodiments are only some of the embodiments, not all of them. Based on the embodiments in this solution, all other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of this solution.

[0044] Example 1

[0045] like Figures 1 to 11 As shown, this embodiment designs a grid structure system for supporting photovoltaic panels, including supporting columns 7, inclined rods 8, supporting seats 9 and grid structures.

[0046] The lower end of the support column 7 is supported on the ground, and the support column 7 includes a long column and a short column, and the upper end of the long column is higher than the short column. When the support column 7 is connected to the grid structure, the grid structure can be tilted so that the photovoltaic panel 10 faces the sun.

[0047] The inclined brace rod 8 is connected between adjacent supporting columns 7. The inclined brace rod 8 can be adjusted in length to adjust the tightness of the inclined brace rod 8, so that the position between the supporting columns 7 is more stable, the inclined upper end of the inclined brace rod 8 can be connected to the flat head at the upper end of the supporting column 7, and the inclined lower end of the inclined brace rod 8 can be fixedly connected to the lower end of the supporting column 7 through a hoop.

[0048] The grid structure includes an upper chord 1, a lower chord 2, a web 3, bolts and other components. The grid structure is mainly used to support the photovoltaic panel 10, and the fasteners on the back of the photovoltaic panel 10 can be installed on the upper chord 1. The upper chord 1, the lower chord 2, and the web 3 are all round rods. Generally, there is no need to design the optimal cross-section of the components according to different load conditions, and the versatility is strong. When used in areas with large wind loads, it can also achieve significant cost control. The surface of each rod is not easy to accumulate water, which reduces the corrosion rate of the material. At the same time, the grid structure is a three-dimensional frame with high structural strength. During installation, the support pillars can be designed to have a larger span.

[0049] The bolt is composed of a screw 4 and a nut 5 , and the nut 5 is threadedly connected to the screw 4 .

[0050] The upper chord rod 1 is a hollow or solid rod, and a plurality of upper chord rod nodes 101 are provided on the upper chord rod 1 as connection nodes. The upper chord rod nodes 101 are flat structures with holes in the middle. The upper and lower surfaces of the flat structure are flat, and the holes on the flat structure penetrate the upper and lower surfaces of the flat structure. The upper chord rod nodes 101 can be a part welded to the upper chord rod 1, or a structure processed by the upper chord rod 1. Different parts of the upper chord rod 1 are flattened and punched by mechanical equipment to form the upper chord rod nodes 101.

[0051] The upper chord 1 is divided into an upper cross bar 1a and an upper longitudinal bar 1b; the upper cross bar 1a and the upper longitudinal bar 1b are cross-connected at the upper chord node 101; the projection of the structure after a plurality of upper chords 1 are connected on the horizontal plane is in a grid shape.

[0052] The lower chord 2 can adopt the same structure as the upper chord 1, and can be a hollow or solid rod. The lower chord 2 is provided with a plurality of lower chord nodes as connection nodes, and the lower chord node is a flat structure with a hole in the middle; the upper and lower surfaces of the flat structure are flat, and the hole on the flat structure passes through the upper and lower surfaces of the flat structure. The lower chord node can be a part welded to the lower chord 2, or a structure processed by the lower chord 2, and different parts of the lower chord 2 are flattened and punched by mechanical equipment to form the lower chord node.

[0053] The lower chord 2 is divided into a lower cross bar 2a and a lower longitudinal bar 2b. The lower cross bar 2a is located below the gap between two adjacent upper cross bars 1a; the lower longitudinal bar 2b is located below the gap between two adjacent upper longitudinal bars 1b; the lower cross bar 2a and the lower longitudinal bar 2b are cross-connected at the node of the lower chord; the projection of the structure after several lower chords 2 are connected on the horizontal plane is in the shape of a grid.

[0054] The web member 3 is processed from a hollow or solid rod, and the web member 3 is V-shaped. A web member middle node 301 is provided in the middle of the web member 3 as a connection node, and a web member end node 304 is provided at the end of the web member 3 as a connection node; the middle of the web member 3 is flattened, punched and bent by mechanical equipment to form the web member middle node 301; the end of the web member 3 is flattened, punched and bent by mechanical equipment to form the web member end node 304.

[0055] The web member 3 includes a first oblique rod segment 302 and a second oblique rod segment 303, and the first oblique rod segment 302 and the second oblique rod segment 303 are divided into an eight-shaped portion; the web member middle node 301 is arranged between the first oblique rod segment 302 and the second oblique rod segment 303, and the ends of the first oblique rod segment 302 and the second oblique rod segment 303 are both provided with web member end nodes 304.

[0056] like Figure 6 As shown, the first oblique rod section 302 and the second oblique rod section 303 may be a structure formed by bending the same rod at the middle node 301 of the web. Fig.12 As shown, the first oblique rod segment 302 and the second oblique rod segment 303 may also be two separate rods, and the oblique lower ends of the first oblique rod segment 302 and the second oblique rod segment 303 overlap and are connected to each other to form a web member middle node 301.

[0057] The upper chord node 101, the lower chord node, the middle web node 301 and the end web node 304 are all flat structures with holes in the middle; the upper and lower surfaces of the flat structure are flat, and the holes on the flat structure penetrate the upper and lower surfaces of the flat structure. In addition, the length of the flat structures such as the upper chord node 101, the lower chord node, the middle web node 301 and the end web node 304 is not less than its width.

[0058] When assembling the upper chord 1, the lower chord 2, the web member 3 and other components: multiple web member middle nodes 301 and multiple lower chord nodes overlap vertically, and bolts passing vertically through the web member middle nodes 301 and the lower chord nodes fix the web member 3 and the lower chord 2 together; gaskets 6 are provided at the connection between the bolts and the web member middle nodes 301 and the lower chord nodes. Multiple web member end nodes 304 and multiple upper chord nodes 101 overlap vertically, and bolts passing vertically through the web member end nodes 304 and the upper chord nodes 101 fix the web member 3 and the upper chord 1 together; gaskets 6 are provided at the connection between the bolts and the web member end nodes 304 and the upper chord nodes 101.

[0059] Two intersecting web members 3 are connected at each lower chord node, and the middle web member nodes 301 of the two web members 3 are vertically overlapped and connected, so that the projection of the grid structure on the horizontal plane is in a cross-shaped grid.

[0060] The support seat 9 includes two parts: a U-shaped head 901 and a vertical plate 906 .

[0061] The U-shaped head 901 is in a U-shape, and the U-shaped mouth of the U-shaped head 901 faces the side of the support seat 9; when the U-shaped head 901 is installed vertically, its U-shaped mouth faces the horizontal direction, and the two side arms of the U-shaped head 901 are the upper side arm and the lower side arm, and the upper side arm is located directly above or obliquely above the lower side arm. An end seat 902 is provided at the free end of the upper side arm and the lower side arm, and the end seat 902 of the upper side arm is located directly above the end seat 902 of the lower side arm. A through hole 903 is provided on the end seat 902 of the upper side arm, and a threaded hole 904 is provided on the end seat 902 of the lower side arm, and the center line of the through hole 903 coincides with that of the threaded hole 904. The diameter of the through hole 903 is 0.5 to 3 mm larger than that of the threaded hole 904.

[0062] The vertical plate 906 is located below the U-shaped head 901, and the upper edge of the vertical plate 906 is fixedly connected to the lower side arm by welding or integral casting. A relief opening 905 is provided on the upper edge of the vertical plate 906, and the relief opening 905 is directly opposite to the threaded hole 904, so that the relief opening 905, the threaded hole 904, and the through hole 903 are located on the same straight line to accommodate the screw 4 passing through the threaded hole 904, and the depth of the relief opening 905 is 0.5 to 20 mm.

[0063] A mounting hole 907 is provided at the lower part of the vertical plate 906. A flat head is provided at the upper end of the support column 7, and the flat head is connected to the mounting hole 907 of the vertical plate 906 by a mounting bolt 11.

[0064] When the support seat 9 is in use, the vertical plate 906 is fixedly connected to the support column 7 of the grid structure, and the U-shaped head 901 is fixedly connected to the grid structure.

[0065] The number of components in this solution in this embodiment is small, and there is no need for complex processes such as welding. Quick connection between the components can be achieved only with bolts and screws. Some components can be pre-installed and then installed in designated positions, which effectively improves the installation quality and efficiency. At the same time, the skill requirements for technicians are lower, and it is easy to meet the conditions for simultaneous assembly by multiple people.

[0066] The above embodiments are merely examples for the purpose of clarifying the description, and are not intended to limit the implementation methods; it is not necessary and impossible to list all implementation methods exhaustively. However, obvious changes or modifications derived therefrom are still within the scope of protection of the present technology.

Claims

1. A grid structure system for supporting photovoltaic panels, characterized in that: It comprises a supporting column (7), a diagonal tie rod (8), a supporting seat (9) and a grid structure; The lower end of the support column (7) is supported on the ground, and the support column (7) comprises a long column and a short column, and the upper end of the long column is higher than the short column; The inclined rod (8) is connected between adjacent supporting columns (7); The grid structure is formed by connecting an upper chord (1), a lower chord (2), a web (3) and bolts; a plurality of connection nodes are arranged on the upper chord (1) and the lower chord (2); the web (3) is V-shaped, and connection nodes are arranged at the middle and end of the web (3); the upper chords (1) that cross each other, the lower chords (2) that cross each other, the web (3) and the lower chord (2), and the web (3) and the upper chord (1) are fixedly connected at corresponding connection nodes; the connection nodes are flat structures with holes in the middle; The support seat (9) comprises a U-shaped head (901) and a vertical plate (906); the U-shaped head (901) is fixedly connected to the upper end of the vertical plate (906), and the U-shaped opening of the U-shaped head (901) faces the side of the support seat (9); through holes (903) and threaded holes (904) are respectively provided at both ends of the U-shaped head (901); the connection nodes of the grid structure are placed in the U-shaped openings, and the support seat (9) is fixedly connected to the grid structure by screws (4) passing through the through holes (903), the threaded holes (904) and the connection nodes; the vertical plate (906) and the upper ends of the support columns (7) are fixed by mounting bolts (11).

2. The grid structure system for supporting photovoltaic panels according to claim 1 is characterized in that: The connection node arranged on the upper chord (1) is an upper chord node (101), and the upper chord (1) is divided into an upper cross bar (1a) and an upper longitudinal bar (1b); the upper cross bar (1a) and the upper longitudinal bar (1b) are cross-connected at the upper chord node (101); the connection node arranged at the end of the web member (3) is a web member end node (304), and bolts passing through the web member end node (304) and the upper chord node (101) are used to fix the web member (3) and the upper chord (1).

3. The grid structure system for supporting photovoltaic panels according to claim 2 is characterized in that: At the connection between the web member (3) and the upper chord member (1), a plurality of web member end nodes (304) and a plurality of upper chord member nodes (101) overlap vertically and are vertically penetrated by bolts to achieve a fixed connection.

4. The grid structure system for supporting photovoltaic panels according to claim 1 is characterized in that: The connection nodes on the lower chord (2) are a plurality of lower chord nodes, and the lower chord (2) is divided into a lower cross bar (2a) and a lower longitudinal bar (2b); the lower cross bar (2a) is located below the gap between two adjacent upper cross bars (1a); the lower longitudinal bar (2b) is located below the gap between two adjacent upper longitudinal bars (1b); the lower cross bar (2a) and the lower longitudinal bar (2b) are cross-connected at the lower chord node; the connection node arranged in the middle of the web member (3) is a web member middle node (301), and bolts passing through the web member middle node (301) and the lower chord node are used to fix the web member (3) and the lower chord (2) together.

5. The grid structure system for supporting photovoltaic panels according to claim 4 is characterized in that: At the connection between the web member (3) and the lower chord member (2), the web member middle node (301) and a plurality of lower chord member nodes overlap vertically and are vertically penetrated by bolts to achieve fixed connection.

6. The grid structure system for supporting photovoltaic panels according to claim 5 is characterized in that: Two mutually intersecting web members (3) are connected at the nodes of the lower chord members, and the web member middle nodes (301) of the two web members (3) are vertically overlapped and connected; the projection of the grid structure on the horizontal plane is in the shape of a cross; the projection of the structure after the plurality of upper chord members (1) are connected on the horizontal plane is in the shape of a cross; the projection of the structure after the plurality of lower chord members (2) are connected on the horizontal plane is in the shape of a cross.

7. The grid structure system for supporting photovoltaic panels according to any one of claims 1 to 6, characterized in that: The web member (3) comprises a first oblique rod section (302) and a second oblique rod section (303), wherein the first oblique rod section (302) and the second oblique rod section (303) are divided into sections in an eight-shaped pattern; a web member middle node (301) is arranged between the first oblique rod section (302) and the second oblique rod section (303), and web member end nodes (304) are arranged at the ends of the first oblique rod section (302) and the second oblique rod section (303).

8. The grid structure system for supporting photovoltaic panels according to any one of claims 1 to 6, characterized in that: The upper chord (1), the lower chord (2) and the web (3) are processed from solid or hollow rods (908); different parts of the upper chord (1) are flattened and punched by mechanical equipment to form an upper chord node (101); different parts of the lower chord (2) are flattened and punched by mechanical equipment to form a lower chord node; the middle part of the web (3) is flattened, punched and bent by mechanical equipment to form a web middle node (301); the end of the web (3) is flattened, punched and bent by mechanical equipment to form a web end node (304).

9. The grid structure system for supporting photovoltaic panels according to any one of claims 1 to 6, characterized in that: The two side arms of the U-shaped head (901) are an upper side arm and a lower side arm, and the upper side arm is located above the lower side arm; the free ends of the upper side arm and the lower side arm are both provided with an end seat (902), a through hole (903) is provided on the end seat (902) of the upper side arm, and a threaded hole (904) is provided on the end seat (902) of the lower side arm, and the center lines of the through hole (903) and the threaded hole (904) coincide with each other; the upper edge of the vertical plate (906) is fixedly connected to the lower side arm; an avoidance opening (905) is provided on the upper edge of the vertical plate (906), and the avoidance opening (905) is opposite to the threaded hole (904) to accommodate the screw (4) passing through the threaded hole (904); and a mounting hole (907) is provided at the lower part of the vertical plate (906).

10. The grid structure system for supporting photovoltaic panels according to claim 9, characterized in that: The U-shaped head (901) is welded to the vertical plate (906) or integrally cast; the diameter of the through hole (903) is 0.5 to 3 mm larger than the threaded hole (904); the depth of the avoidance opening (905) is 0.5 to 20 mm; a flat head is provided at the upper end of the support column (7), and the flat head is connected to the vertical plate (906) by means of mounting bolts (11).

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