Transformer framework

Abstract

The application discloses a power transformation framework, comprising a support assembly, a crossbeam assembly and a connecting piece. The support assembly comprises a first support and a second support which are arranged at intervals along a first direction. The crossbeam assembly is arranged between the first support and the second support and comprises a first end and a second end which are opposite along the first direction. The first end and the second end are arranged on the first support and the second support respectively through the connecting piece. The connecting piece comprises a bottom plate, a first clamping plate and a second clamping plate. The bottom plate has a first plate surface and a second plate surface which are arranged oppositely. The first clamping plate and the second clamping plate are arranged at intervals on the first plate surface. The first end or the second end is fixedly connected between the first clamping plate and the second clamping plate. The power transformation framework can reduce the bending moment caused by the pressure, ensure the operation reliability of the power transformation framework and reduce the cost.

Description

Technical Field

[0001] This application relates to the field of power transmission and transformation technology, and in particular to a substation architecture. Background Technology

[0002] As one of the main pieces of equipment in a substation, the substation frame is used to suspend and support conductors, switchgear, and other electrical equipment. In existing substation frames, the beams are typically fixed to the support columns via flange-to-flange connections, resulting in high material consumption and cost. Furthermore, the support columns of conventional composite material substation frames are purely metal structures, failing to make efficient use of space and leading to an increase in the span of the composite beams. Therefore, to solve these problems, a new substation frame must be designed. Summary of the Invention

[0003] The purpose of this application is to provide a substation frame that can reduce the bending moment caused by the pressure it bears, ensure the operational reliability of the substation frame, and reduce costs.

[0004] To achieve the above objectives, this application provides a substation frame, which includes: a support assembly, including a first support member and a second support member spaced apart along a first direction; a crossbeam assembly, disposed between the first support member and the second support member, and including a first end and a second end opposite to each other along the first direction; and a connector, wherein the first end and the second end are respectively disposed on the first support member and the second support member through the connector, the connector including a base plate, a first clamping plate and a second clamping plate, the base plate having a first plate surface and a second plate surface disposed opposite to each other, the first clamping plate and the second clamping plate being spaced apart on the first plate surface, and the first end or the second end being fixedly connected between the first clamping plate and the second clamping plate.

[0005] The connector also includes a side plate, which is vertically mounted on the base plate and simultaneously fixes the ends of the first clamping plate and the second clamping plate located on the same side.

[0006] The connector also includes two first connecting ears, which are located on the outer side of the first clamping plate away from the second clamping plate and on the outer side of the second clamping plate away from the first clamping plate, respectively.

[0007] The outer side plate of the side plate, away from the first clamping plate, is provided with a second connecting ear for fixing the connecting support assembly.

[0008] The second plate has a first flange for fixing and connecting the support assembly.

[0009] The first support member and the second support member each include several support segments, which gradually approach and are fixedly connected to the connector in a bottom-to-top direction.

[0010] The beam assembly includes a first sub-beam fixedly connected to a first support member and a second sub-beam fixedly connected to a second support member. The end of the first sub-beam closest to the first support member is the first end of the beam assembly, and the end of the second sub-beam closest to the second support member is the second end of the beam assembly.

[0011] The first and second ends are each provided with a fourth flange, which includes: a fourth flange cylinder, which is hollow along the axial direction; a fourth flange plate, which covers the side of the fourth flange cylinder away from the crossbeam assembly; and two second insert plates, which are located on the side of the fourth flange plate away from the crossbeam assembly, for fixing and connecting the first clamping plate and the second clamping plate respectively.

[0012] The first and second clamping plates are provided with a number of first through holes, and the two second insert plates are provided with a number of second through holes. The two second insert plates are respectively attached to the inner plate surface of the first clamping plate near the second clamping plate and the inner plate surface of the second clamping plate near the first clamping plate. After the first through holes and the second through holes are matched, fasteners are inserted to fix the two second insert plates and the first and second clamping plates.

[0013] A wire-hanging plate is provided between the first and second sub-beams for hanging wires.

[0014] The crossbeam assembly also includes at least one intermediate sub-crossbeam connecting the first sub-crossbeam and the second sub-crossbeam. A wire hanging plate is provided between the intermediate sub-crossbeam and the first sub-crossbeam, and between the intermediate sub-crossbeam and the second sub-crossbeam, for hanging wires.

[0015] The beneficial effects of this application are as follows: Unlike existing technologies, this application uses a plug-in connection between the crossbeam assembly and the connector. Under the same stress conditions, this reduces the bending moment of the crossbeam assembly. Compared to the flange-to-flange design, it also further reduces material usage, thereby lowering costs. Simultaneously, it effectively reduces the torque from the substation frame's mounting points to the supporting components. Furthermore, because the substation frame provided by this application has increased structural rigidity and reduced offset, it effectively ensures the stress reliability of each connection point, thus guaranteeing the overall operational reliability of the substation frame. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 This is a three-dimensional structural diagram of the substation frame 100 of this application;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a three-dimensional structural diagram of the connector 130 of this application;

[0020] Figure 4 This is a three-dimensional structural diagram of the third flange 1152 of this application;

[0021] Figure 5 This is a structural schematic diagram of the first sub-beam 1210 of this application;

[0022] Figure 6 This is a three-dimensional structural diagram of the fourth flange 1211 of this application;

[0023] Figure 7 for Figure 1 Enlarged view of point B in the middle. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0025] Please see Figures 1 to 3 This application provides a substation frame 100, including a support assembly 110, a crossbeam assembly 120, and a connector 130. The support assembly 110 includes a first support member 111 and a second support member 112 spaced apart along a first direction. The crossbeam assembly 120 is disposed between the first support member 111 and the second support member 112, and includes a first end 121 and a second end 122 opposite to each other along the first direction. The first end 121 and the second end 122 are respectively disposed on the first support member 111 and the second support member 112 through the connector 130.

[0026] The connector 130 includes a base plate 131, a first clamping plate 132, and a second clamping plate 133. The base plate 131 has a first plate surface and a second plate surface that are opposite to each other. The first clamping plate 132 and the second clamping plate 133 are spaced apart from each other and perpendicularly disposed on the first plate surface of the base plate 131, and the plate surfaces of the first clamping plate 132 and the second clamping plate 133 are parallel to each other, thereby forming an installation space between the first clamping plate 132 and the second clamping plate 133. The connector 130 also includes a side plate 134, which is perpendicularly disposed on the base plate 131 and simultaneously fixes the ends of the first clamping plate 132 and the second clamping plate 133 located on the same side. That is, the side plate 134 covers the ends of the first clamping plate 132 and the second clamping plate 133 located on the same side, making the structure of the first clamping plate 132 and the second clamping plate 133 stable. The side plate 134 can be disposed on the first plate surface or on the side plate surface of the base plate 131, as long as it covers the first clamping plate 132 and the second clamping plate 133.

[0027] The connector 130 also includes a reinforcing plate 135, which is vertically disposed on the first surface of the base plate 131 and simultaneously fixedly connected to the first clamping plate 132 and the second clamping plate 133. Specifically, the reinforcing plate 135 is located between the first clamping plate 132 and the second clamping plate 133 and is arranged parallel to the side plate 134, that is, the reinforcing plate 135 is located within the space formed by the first clamping plate 132, the second clamping plate 133 and the side plate 134, further enhancing the structural stability of the first clamping plate 132 and the second clamping plate 133. Furthermore, a certain distance is maintained between the reinforcing plate 135 and the side of the first clamping plate 132 and the second clamping plate 133 away from the side plate 134, ensuring that there remains a space for installation between the first clamping plate 132 and the second clamping plate 133. At this time, the first clamping plate 132, the second clamping plate 133 and the reinforcing plate 135 form an installation space. The first clamping plate 132 and the second clamping plate 133 are provided with a plurality of first through holes 1321 on the side away from the side plate 134. The first end 121 or the second end 122 of the crossbeam assembly 120 is fixedly connected between the first clamping plate 132 and the second clamping plate 133 through the first through holes 1321, thereby fixing the crossbeam assembly 120 to the connector 130.

[0028] The connector 130 further includes two first flanges 136, which are spaced apart on the second plate surface of the base plate 131. Figure 1 and Figure 3In this configuration, the aforementioned first clamping plate 132 and other structures are located on the top surface of the base plate 131, used for fixing and connecting the crossbeam assembly 120; two first flanges 136 are located on the bottom surface of the base plate 131, used for fixing and connecting the support assembly 110. Each first flange 136 includes a first flange cylinder and a first flange plate. The first flange cylinder is axially hollow, with one end fixedly connected to the second plate surface of the base plate 131, and the other end covered by the first flange plate. The first flange plate has several mounting holes. The connecting member 130 is fixedly connected to the support assembly 110 via the first flanges 136. Specifically, on the same connecting member 130, the flange plates of the two first flanges 136 are designed at a certain angle to match the installation angle of the support assembly 110.

[0029] Furthermore, a number of first reinforcing ribs are provided along the circumferential direction on the outer circumferential surface of the first flange cylinder. The first reinforcing ribs are plate parts, and two adjacent sides of the first reinforcing ribs are connected to the first flange cylinder and the first flange plate at the same time, which further enhances the overall stability of the first flange 136 and improves its mechanical strength.

[0030] The connector 130 also includes a first connecting ear 137 and a second connecting ear 138. Two first connecting ears 137 are provided, located on the outer surface of the first clamping plate 132 away from the second clamping plate 133, and on the outer surface of the second clamping plate 133 away from the first clamping plate 132, respectively, for fixing and connecting the incoming and outgoing line tension insulators (not shown), thereby allowing the conductors to be attached via the tension insulators. The second connecting ear 138 is located on the outer surface of the side plate 134 away from the first clamping plate 132, for fixing and connecting the support assembly 110.

[0031] The connector 130 is made of metal materials, such as aluminum alloy and stainless steel. Each component can be formed separately and then welded together, or it can be formed as a whole by casting.

[0032] Both the first support member 111 and the second support member 112 include several support segments, which gradually approach and are fixedly connected to the connector 130 from bottom to top. In this embodiment, the first support member 111 includes three support segments, namely the first support segment 113, the second support segment 114, and the third support segment 115, which gradually approach and are fixedly connected to the connector 130 from bottom to top. Specifically, the first support segment 113 and the second support segment 114 are fixedly connected to the two first flanges 136, and the third support segment 115 is fixedly connected to the second connecting lug 138, so that the first support member 111 is arranged in a triangular shape, that is, the space between the first support segment 113, the second support segment 114, and the third support segment 115 forms a triangular pyramid with the connector 130 as the vertex, which enhances the structural stability of the first support member 111.

[0033] The first support section 113 includes a composite section 1131 and a metal section 1132. The composite section 1131 is a composite post insulator, comprising an insulator and a skirt covering the periphery of the insulator. Specifically, the insulator can be a solid insulating core or a hollow insulating tube. When the insulator is a solid insulating core, it can be a solid mandrel formed by winding, pultruding, or pultruding and winding glass fiber or aramid fiber impregnated with epoxy resin. When the insulator is a hollow insulating tube, it can be a hollow pultruded tube formed by pultruding and winding glass fiber or aramid fiber impregnated with epoxy resin, a fiberglass tube formed by winding and curing glass fiber impregnated with epoxy resin, or an aramid fiber tube formed by winding and curing aramid fiber impregnated with epoxy resin. No limitation is made here.

[0034] The insulator of the composite section 1131 is fitted with second flanges 1133 at both ends. Each second flange 1133 includes a second flange cylinder and a second flange plate. The second flange cylinder is axially hollow and fitted onto the end of the insulator. The second flange plate covers the side of the second flange cylinder away from the composite section 1131. The second flange plate has several mounting holes. One end of the composite section 1131 is fixedly connected to the metal section 1132 through the mounting holes, and the other end is installed and fixed after correspondingly matching the mounting holes on the first flange 136 through the mounting holes, thus fixing the first support section 113 to the connector 130. Simultaneously, several second reinforcing ribs are provided circumferentially on the outer circumferential surface of the second flange cylinder. The structure is similar to the first reinforcing ribs and will not be described further, further enhancing the mechanical strength of the second flange 1133.

[0035] Metal segment 1132 comprises several interconnected metal cylinders, which are fixedly connected by flanges or by welding. One end of metal segment 1132 is fixedly connected to composite segment 1131, and the other end is used to support the crossbeam assembly 120 on the ground. Of course, metal segment 1132 can also be a single, continuous metal cylinder, and this is not a limitation.

[0036] The structure and material of the second support section 114 are the same as those of the first support section 113, and will not be described again. The third support section 115 differs from the first support section 113 in that the insulator ends of the composite section 1151 of the third support section 115 are respectively fitted with a second flange 1133 and a third flange 1152, combined with... Figure 2 and Figure 4As shown, the third flange 1152 includes a third flange cylinder 11521, a third flange plate 11522, and two first insert plates 11523. The third flange cylinder 11521 is axially hollow. The third flange plate 11522 covers the side of the third flange cylinder 11521 away from the composite section 1151. The two first insert plates 11523 are spaced apart on the side of the third flange plate 11522 away from the composite section 1151, and are used to insert into both sides of the second connecting lug 138. The third support section 115 is fixedly connected to the connector 130 by fasteners. At the same time, the outer surface of the first insert plate 11523 is also provided with a third reinforcing rib 11524. The third reinforcing rib 11524 connects the first insert plate 11523 and the third flange plate 11522, further enhancing the structural stability of the third flange 1152.

[0037] Continue reading Figure 1 A first auxiliary component 1110 is provided between the first support section 113, the second support section 114, and the third support section 115. The first auxiliary component 1110 is also a metal component and is fixed to the three metal sections simultaneously by welding, further connecting the first support section 113, the second support section 114, and the third support section 115 together. The provision of the first auxiliary component 1110 makes the triangular pyramidal spatial structure between the first support section 113, the second support section 114, and the third support section 115 more stable, and can better support the crossbeam assembly 120. Furthermore, one, two, or other quantities of the first auxiliary component 1110 can be provided, depending on the actual application, as long as the support requirements are met.

[0038] Unlike the first support member 111, the second support member 112 consists of only two support sections. From bottom to top, the two support sections gradually approach each other and are fixedly connected to the two first flanges of the connector, forming a V-shape to support the beam assembly 120. The structure and material of the two support sections are the same as those of the first support section 113, and will not be described again. Furthermore, a second auxiliary member 1120 is provided between the two support sections. The second auxiliary member 1120 is simultaneously fixed to both support sections by welding, connecting the two support sections together and providing better support for the beam assembly 120.

[0039] See Figure 1 , Figure 2 , Figure 5 and Figure 6The crossbeam assembly 120 includes a first sub-crossbeam 1210 fixedly connected to the first support member 111 and a second sub-crossbeam 1220 fixedly connected to the second support member 112. The end of the first sub-crossbeam 1210 near the first support member 111 is the first end 121 of the crossbeam assembly 120, and the end of the second sub-crossbeam 1220 near the second support member 112 is the second end 122 of the crossbeam assembly 120. The other end of the first sub-crossbeam 1210 away from the first support member 111 is connected to the other end of the second sub-crossbeam 1220 away from the second support member 112.

[0040] In this embodiment, the first sub-beam 1210 is also a composite post insulator, with a specific structure and material similar to the composite section 1131, and will not be described again. A fourth flange 1211 and a fifth flange 1212 are respectively fitted onto both ends of the insulator of the first sub-beam 1210 to facilitate its installation. Specifically, the fourth flange 1211 connected to one end of the first sub-beam 1210 is used to fix the first sub-beam 1210 to the connector 130, and the fifth flange 1212 connected to the other end of the first sub-beam 1210 is used to fix the first sub-beam 1210 to the second sub-beam 1220. The first end 121 is the first end 121 of the first sub-beam 1210 which is fitted with the fourth flange 1211. The fourth flange 1211 includes a fourth flange cylinder 12111, a fourth flange plate 12112 and two second insert plates 12113. The fourth flange cylinder 12111 is hollow along the axial direction. The fourth flange plate 12112 covers the side of the fourth flange cylinder 12111 away from the beam assembly 120. The two second insert plates 12113 are located on the side of the fourth flange plate 12112 away from the beam assembly 120 and are used to fix them to the connector 130. Specifically, the two second insert plates 12113 are respectively close to the inner plate surface of the first clamping plate 132 near the inner plate surface of the second clamping plate 133, and the second clamping plate 133 near the inner plate surface of the first clamping plate 132. The two second insert plates 12113 are provided with a plurality of second through holes 12114 corresponding to the first through holes 1321 on the first clamping plate 132 and the second clamping plate 133. After the plurality of first through holes 1321 and the plurality of second through holes 12114 are matched, fasteners are inserted to fix the two second insert plates 12113 and the first clamping plate 132 and the second clamping plate 133, so that the fourth flange 1211 is connected to the connector 130 by plug-in fixing, that is, the first sub-beam 1210 is connected to the connector 130 by plug-in fixing. Compared with the traditional flange-to-flange connection method, the plug-in fixing method can reduce the bending moment of the beam assembly 120 under the same stress conditions, as well as reduce materials and lower costs.

[0041] The fifth flange 1212 includes a fifth flange cylinder and a fifth flange plate. The fifth flange cylinder is configured as a hollow structure along the axial direction, and the fifth flange plate covers the side of the fifth flange cylinder away from the first sub-beam 1210.

[0042] In this embodiment, the second sub-beam 1220 is also a composite post insulator, with the same structure and material as the first sub-beam 1210, and will not be described again. The second end 122 of the second sub-beam 1220 is fitted with the fourth flange 1211. The fourth flange 1211 is used to fix the second sub-beam 1220 to the connector 130 via a plug-in connection. The fifth flange 1212 connected to the other end of the second sub-beam 1220 is used to cooperate with the fifth flange 1212 connected to the other end of the first sub-beam 1210, thereby fixing the second sub-beam 1220 to the first sub-beam 1210.

[0043] Combination Figure 1 and Figure 7 As shown, a wire hanging plate 1201 is also provided between the first sub-beam 1210 and the second sub-beam 1220. The wire hanging plate 1201 is provided with mounting holes for fixing the wire hanging plate 1201 to the fifth flange of the fifth flange 1212 and wire hanging holes for hanging wires.

[0044] In this embodiment, since the portion of the support assembly 110 near the crossbeam assembly 120 and the crossbeam assembly 120 are both composite post insulators, the connector 130 can also serve as a conductor hanging point. Therefore, two hanging points are formed on the two connectors 130 at both ends of the crossbeam assembly 120. Thus, only one hanging point is needed on the crossbeam assembly 120 to hang three-phase conductors. Compared to traditional support assemblies that are all-metal structures and require three hanging points on the crossbeam assembly, the span of the crossbeam assembly 120 in this application can be made smaller, reducing costs.

[0045] In other embodiments, the beam assembly also includes an intermediate sub-beam (not shown) connecting the first sub-beam and the second sub-beam. The intermediate sub-beam is also a composite post insulator. Both ends of the insulator of the intermediate sub-beam are fitted with fifth flanges, so that the intermediate sub-beam is fixedly connected to the first sub-beam and the second sub-beam respectively. Hanging plates are provided between the intermediate sub-beam and the first sub-beam, and between the intermediate sub-beam and the second sub-beam, for hanging wires to accommodate the hanging of multi-phase wires.

[0046] Of course, the number of intermediate sub-beams is not limited to one; there can be two or more. Several intermediate sub-beams can be interconnected, and there can also be hanging plates between several intermediate sub-beams for hanging wires. The configuration can be set according to the actual application scenario of the substation structure, and there are no restrictions here.

[0047] By adopting a composite post insulator structure for the support assembly 110 and the crossbeam assembly 120, the height and width of the substation frame 100 can be effectively reduced, as well as land acquisition costs. This also reduces the amount of steel pipe support and foundation work, consequently lowering transportation and installation costs and saving investment. Furthermore, it is more conducive to conserving and utilizing state-owned resources. Compared to steel components, composite material products have lower production energy consumption, reducing environmental pollution. Simultaneously, composite materials are easy to process and their colors are adjustable, allowing for environmental harmony and enhancing the line's environmental friendliness. This achieves the goal of maintenance-free operation throughout the entire life cycle, significantly improving the simplicity of substation frame module operation and maintenance. In addition, the support assembly 110 and crossbeam assembly 120 are composite post insulators with high bending and compressive strength. When the vertical load is too large, the crossbeam assembly 120 exhibits minimal deformation, effectively controlling the vertical offset at the wire hanging point. Simultaneously, the substation frame 100 of this application, with its excellent external insulation performance, eliminates the safety hazards of pollution flashover and rain flashover, improving the substation's safe operation level.

[0048] Furthermore, the crossbeam assembly 120 and the connector 130 are fixedly connected by a plug-in method. Under the same stress conditions, the bending moment of the crossbeam assembly 120 can be reduced. Compared with the flange-to-flange design, it can also further reduce materials, thereby reducing costs. At the same time, it can effectively reduce the torque from the hanging point of the substation frame 100 to the support assembly 110. In addition, since the substation frame 100 provided by this application has increased structural rigidity and reduced offset, it effectively ensures the stress reliability of each connection of the substation frame 100, so as to ensure the operational reliability of the entire substation frame 100.

[0049] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or principle transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A substation structure, characterized in that, include: The support assembly includes a first support member and a second support member that are spaced apart along a first direction; A beam assembly is disposed between the first support member and the second support member, and includes a first end and a second end opposite to each other along the first direction; A connector is provided, with the first end and the second end respectively mounted on the first support and the second support via the connector. The connector includes a base plate, a first clamping plate, and a second clamping plate. The base plate has a first plate surface and a second plate surface arranged opposite to each other. The first clamping plate and the second clamping plate are spaced apart on the first plate surface. The first clamping plate and the second clamping plate are provided with a plurality of first through holes. The first end or the second end is fixedly connected between the first clamping plate and the second clamping plate through the first through holes. The connector also includes a side plate, which is vertically disposed on the base plate and simultaneously fixedly connected to the ends of the first clamping plate and the second clamping plate located on the same side. The connector also includes two first connecting ears, which are respectively located on the outer plate surface of the first clamping plate away from the second clamping plate and on the outer plate surface of the second clamping plate away from the first clamping plate.

2. The substation structure according to claim 1, characterized in that, The outer side plate of the side plate away from the first clamping plate is provided with a second connecting ear for fixing the support assembly.

3. The substation structure according to claim 1, characterized in that, The second plate surface is provided with a first flange for fixing the support assembly.

4. The substation structure according to claim 1, characterized in that, Both the first support member and the second support member include several support segments, which gradually approach and are fixedly connected to the connector in a bottom-to-top direction.

5. The substation structure according to claim 1, characterized in that, The beam assembly includes a first sub-beam fixedly connected to the first support member and a second sub-beam fixedly connected to the second support member. The end of the first sub-beam closer to the first support member is the first end of the beam assembly, and the end of the second sub-beam closer to the second support member is the second end of the beam assembly.

6. The substation structure according to claim 5, characterized in that, Both the first end and the second end are provided with a fourth flange, the fourth flange comprising: The fourth flange cylinder is configured as a hollow structure along the axial direction; The fourth flange covers the side of the fourth flange cylinder away from the beam assembly; Two second insert plates are located on the side of the fourth flange away from the crossbeam assembly, for fixing the first clamping plate and the second clamping plate respectively.

7. The substation structure according to claim 6, characterized in that, The two second insert plates are provided with a plurality of second through holes. The two second insert plates are respectively attached to the inner plate surface of the first clamping plate near the second clamping plate and the inner plate surface of the second clamping plate near the first clamping plate. After the first through holes and the second through holes are matched, fasteners are inserted to fix the two second insert plates and the first clamping plate and the second clamping plate.

8. The substation structure according to claim 5, characterized in that, A wire-hanging plate is provided between the first sub-beam and the second sub-beam for hanging wires.

9. The substation structure according to claim 5, characterized in that, The beam assembly also includes at least one intermediate sub-beam connecting the first sub-beam and the second sub-beam. A wire hanging plate is provided between the intermediate sub-beam and the first sub-beam, and between the intermediate sub-beam and the second sub-beam, for hanging wires.

Images