Sheet molding compound (SMC) composite trapezoid bridge

Abstract

The embodiment of the utility model relates to the technical field of split mounting type wire slots, and provides an SMC composite trapezoid bridge which comprises a plurality of cross beams which are arranged in sequence, and the two ends of each cross beam are provided with insertion parts. The number of the side plates is two, each side plate is provided with an inserting groove, the two ends of each inserting groove are provided with a groove bottom and an inserting opening respectively, and the two inserting parts at the two ends of the cross beam are inserted into the inserting grooves of the two side plates respectively; wherein the insertion part is in a plate shape and is provided with a first arc-shaped top pressing part and a second arc-shaped top pressing part, and the first arc-shaped top pressing part and the second arc-shaped top pressing part enable one side of the insertion part to form a bulge and the other side of the insertion part to form a groove; the first arc-shaped jacking part and the second arc-shaped jacking part are located beside the groove bottom and the insertion opening respectively. According to the technical scheme, the technical problem that in the prior art, the strength of an SMC trapezoid bridge needs to be improved through bolt connection is solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of assembled cable tray technology, and more specifically, to an SMC composite material ladder-shaped cable tray. Background Technology

[0002] SMC composite material, or Sheet Molding Compound, is mainly composed of unsaturated polyester resin, glass fiber roving, fillers, and various additives. This material possesses excellent mechanical properties, such as high strength and high rigidity, capable of withstanding certain pressure and impact forces. It also exhibits excellent electrical insulation, corrosion resistance, and aging resistance, making it adaptable to various working environments. The assembled trapezoidal cable tray has a trapezoidal shape, consisting of side plates and crossbars. The side plates are typically vertical or slightly inclined planes, while the crossbars connect the two side plates laterally, forming a ladder-like structure. This structure provides the cable tray with ample open space, facilitating cable laying, organization, and maintenance. In existing technologies, assembled trapezoidal cable trays generally employ a combination of bolted and slotted connections. Bolted connections are more robust and suitable for applications requiring high tensile strength or vibration, while slotted connections ensure precise alignment between modules. In the existing technology, the assembled trapezoidal cable tray with bolt connection and slot requires a lot of bolting operations in production. In order to ensure connection stability, bolt connection is still needed to increase strength. Therefore, it is necessary to design a boltless SMC composite material trapezoidal cable tray, which can not only save bolt connection and facilitate production, but also have better connection strength. Utility Model Content

[0003] To overcome the above-mentioned defects, the embodiments of this disclosure provide an SMC composite material ladder-shaped cable tray, which solves the technical problem that SMC composite material ladder-shaped cable trays in the prior art require bolt connections to improve strength.

[0004] According to one aspect, at least one embodiment of this disclosure provides an SMC composite material ladder-type cable tray, comprising:

[0005] The crossbeam consists of several crossbeams arranged sequentially, each with an insertion portion at both ends;

[0006] The side plates are two in number and each has a slot. Each slot has a bottom and an insertion opening at both ends. The two insertion parts at both ends of the crossbeam are respectively inserted into the slots of the two side plates.

[0007] The insertion part is plate-shaped and has a first arc-shaped pressing part and a second arc-shaped pressing part. The first arc-shaped pressing part and the second arc-shaped pressing part cause a protrusion to be formed on one side of the insertion part and a groove to be formed on the other side. The first arc-shaped pressing part and the second arc-shaped pressing part are respectively located next to the bottom of the groove and next to the insertion port.

[0008] For example, at least one embodiment of this disclosure provides an SMC composite material trapezoidal cable tray, wherein the insertion port has a plurality of connecting strips that divide the insertion port into a plurality of segments; and the insertion part has a plurality of strip-shaped openings that divide the insertion part into a plurality of segments.

[0009] For example, at least one embodiment of this disclosure provides an SMC composite material trapezoidal cable tray, wherein the end of the strip opening near the bottom of the groove has a locking portion, the bottom of the groove has a locking groove, and the orientation of the locking groove is perpendicular to the orientation of the slot.

[0010] For example, at least one embodiment of this disclosure provides an SMC composite material ladder-shaped cable tray, wherein there are two card slots and two card grooves.

[0011] For example, at least one embodiment of this disclosure provides an SMC composite material trapezoidal cable tray, wherein both the card portion and the card slot are triangular.

[0012] For example, at least one embodiment of this disclosure provides an SMC composite material trapezoidal cable tray, wherein the inner wall of the slot also has a guide bar, which is slidably disposed in the slot.

[0013] For example, at least one embodiment of this disclosure provides an SMC composite material trapezoidal cable tray, wherein the guide strip also has a guide groove, which is used to guide the card portion.

[0014] For example, at least one embodiment of this disclosure provides an SMC composite material ladder-shaped cable tray, wherein the four corners of the insertion part are all chamfered.

[0015] For example, at least one embodiment of this disclosure provides an SMC composite material trapezoidal cable tray, wherein the inner wall of the side plate has several reinforcing ridges.

[0016] For example, at least one embodiment of this disclosure provides an SMC composite material ladder-shaped cable tray, wherein both the upper and lower ends of the side plate have transverse edges.

[0017] The beneficial effects of the embodiments disclosed herein are as follows:

[0018] This disclosure significantly reduces the complexity of production and installation while ensuring the performance of the cable tray. The inserts at both ends of the crossbeam are inserted into the slots through the insertion ports on the side plate, and a stable connection is achieved using the first and second arc-shaped pressing parts. Through this innovative boltless connection structure, the dual goals of convenient production and reliable use are achieved. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0020] Figure 1 This is a three-dimensional structural diagram of an assembled trapezoidal cable tray in one embodiment of the present disclosure;

[0021] Figure 2 for Figure 1 A top view of the assembled trapezoidal cable tray in the embodiment;

[0022] Figure 3 for Figure 2 Schematic diagram of the sectional structure of the middle AA section;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of the partial structure of B in the middle section;

[0024] Figure 5 for Figure 1 A side view of the assembled trapezoidal cable tray in the embodiment;

[0025] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure of the middle CC section;

[0026] Figure 7 for Figure 6 A magnified schematic diagram of the middle D section;

[0027] In the diagram: crossbeam-1, insert-100, first arc-shaped pressing part-101, second arc-shaped pressing part-102, protrusion-103, groove-104, strip-shaped opening-105, locking part-106, side plate-2, slot-200, slot bottom-201, insertion port-202, connecting bar-203, locking groove-204, guide bar-205, guide groove-206, reinforcing ridge-207, cross edge-208. Detailed Implementation

[0028] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0029] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0031] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0033] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] like Figures 1-7As shown, an SMC composite material ladder-shaped cable tray according to an embodiment of the present disclosure includes a crossbeam 1, which consists of several crossbeams arranged sequentially, each having an insertion portion 100 at both ends; two side plates 2, each having a slot 200, with a groove bottom 201 and an insertion port 202 at each end of the slot 200; the two insertion portions 100 at both ends of the crossbeam 1 are respectively inserted into the slots 200 of the two side plates 2; wherein, the insertion portion 100 is plate-shaped and has a first arc-shaped pressing portion 101 and a second arc-shaped pressing portion 102, the first arc-shaped pressing portion 101 and the second arc-shaped pressing portion 102 forming a protrusion 103 on one side and a groove 104 on the other side of the insertion portion 100; the first arc-shaped pressing portion 101 and the second arc-shaped pressing portion 102 are located next to the groove bottom 201 and the insertion port 202, respectively.

[0035] In this SMC composite ladder-type cable tray: Crossbeams 1 serve as transverse support components for the cable trays, and several are arranged sequentially. The inserts 100 at both ends of each beam are used to connect to slots 200 in the side plates 2. There are two side plates 2, arranged opposite each other. The two ends of the slots 200 are the slot bottom 201 and the insertion port 202, respectively. The inserts 100 at both ends of the crossbeams 1 are inserted into the slots 200 through the insertion ports 202. The inserts 100 have a plate-like structure, with a unique design for the first arc-shaped pressing part 101 and the second arc-shaped pressing part 102. During actual assembly, when the inserts 100 are inserted into the slots 200, the first arc-shaped pressing part 101, close to the slot bottom 201, exerts pressure on the side plates 2, increasing the stability of the connection; the second arc-shaped pressing part 102, close to the insertion port 202, plays a guiding and initial positioning role during insertion.

[0036] The advantages of this design are: firstly, it eliminates the cumbersome operation of bolt connections, simplifying the production process and improving production efficiency; secondly, through the unique arc-shaped top pressure design, it can still ensure the strength and stability of the cable tray connection without using bolts.

[0037] For example, in actual cable laying work, there is no need to spend time tightening bolts to quickly assemble the cable tray, and it can withstand the weight of the cable and possible external forces without easily deforming or loosening.

[0038] In terms of technical effectiveness, it significantly reduces the complexity of production and installation while ensuring the performance of the cable tray. Overall working principle: The inserts 100 at both ends of the crossbeam 1 are inserted into the slots 200 through the insertion ports 202 of the side plate 2, and a stable connection is achieved using the first arc-shaped pressing part 101 and the second arc-shaped pressing part 102. Overall technical effect: Through an innovative boltless connection structure, the dual goals of convenient production and reliable use are achieved.

[0039] In some examples, the insertion port 202 has several connecting strips 203 that divide the insertion port 202 into several parts; the insertion part 100 has several strip-shaped openings 105 that divide the insertion part 100 into several parts.

[0040] In this SMC composite material ladder-shaped cable tray: several connecting strips 203 are provided at the insertion port 202, which divide the insertion port 202 into several parts. The insertion part 100 has several strip-shaped openings 105, which also divide the insertion part 100 into several parts.

[0041] In practical applications, such as when assembling cable trays, the connecting bar 203 at the insertion port 202 can play a guiding role, allowing the insertion part 100 to be inserted into the slot 200 more accurately. At the same time, the connecting bar 203 can also increase the structural strength of the insertion port 202, preventing deformation or damage during frequent insertion and removal.

[0042] The strip-shaped opening 105 on the insertion part 100 reduces the weight of the insertion part 100 on the one hand, and increases the elasticity and deformation capacity of the insertion part 100 on the other hand, so that it can better adapt to the shape and size of the slot 200 when inserted into the slot 200, thereby improving the tightness and stability of the connection.

[0043] The advantages of this design are: firstly, it improves the convenience and accuracy of assembly, reducing assembly difficulty; secondly, it enhances the structural performance of the insertion port 202 and the insertion part 100, extending the service life of the cable tray.

[0044] For example, in large-scale duct assembly operations, the design of the connecting bar 203 and the slot 105 can significantly improve work efficiency and reduce assembly errors.

[0045] In terms of technical effects, the assembly performance of the cable tray has been optimized, and the reliability of the structure has been enhanced. Overall working principle: Through the guiding and reinforcing effect of the connecting bar 203 and the adaptability provided by the slot 105, more efficient and stable cable tray assembly is achieved. Overall technical effect: Through detailed design, the assembly quality and reliability of the cable tray have been improved.

[0046] In some examples, the end of the slot 105 near the bottom of the slot 201 has a locking portion 106, and the bottom of the slot 201 has a locking groove 204, the orientation of which is perpendicular to the orientation of the slot 200.

[0047] In this SMC composite material ladder cable tray: A locking part 106 is provided at one end of the slot 105 near the bottom 201 of the slot, and a corresponding locking groove 204 is provided at the bottom 201 of the slot, with the groove 204 oriented perpendicular to the orientation of the slot 200. During actual assembly, when the insert 100 is inserted into the slot 200 to a certain depth, the locking part 106 on the slot 105 will engage with the locking groove 204 at the bottom 201 of the slot.

[0048] This design has significant advantages: First, it further enhances the stability of the connection between the crossbeam 1 and the side plate 2, preventing the insertion part 100 from accidentally coming out of the slot 200. Second, the vertically arranged slot 204 can withstand greater tensile and impact forces, improving the overall structural strength of the cable tray.

[0049] For example, when the cable tray is subjected to external force pulling or vibration, the cooperation between the locking part 106 and the locking slot 204 can effectively maintain the connection state of the cable tray and ensure the safe laying of the cable.

[0050] In terms of technical effects, it significantly improves the reliability of the cable tray connection and its resistance to external interference. Overall working principle: As the insert 100 is inserted, the locking part 106 finally engages with the slot 204, achieving a more secure connection. Overall technical effect: Through the cooperation between the locking part 106 and the slot 204, the connection performance of the cable tray is strengthened, ensuring its stable operation under various working conditions.

[0051] In some examples, there are two card parts 106 and two card slots 204. During actual assembly, the two card parts 106 and the two card slots 204 are matched one-to-one. When the insert 100 is fully inserted into the slot 200, the two card parts 106 simultaneously engage with their corresponding card slots 204.

[0052] This design has significant advantages: First, it enhances the stability of the connection, allowing the connection between the crossbeam 1 and the side plate 2 to withstand greater external forces and preventing it from loosening or falling off. Second, the cooperation between the two locking parts 106 and the locking slot 204 is more balanced, avoiding damage caused by excessive force on a single connection point.

[0053] For example, when laying a large number of heavy cables in the cable tray, or when the environment in which the cable tray is located experiences frequent vibrations, the design of the two clamps 106 and the clamp slot 204 can ensure the stability of the cable tray structure and guarantee the safe laying of cables.

[0054] In terms of technical effects, it greatly improves the reliability and resistance to external forces of the cable tray connection. Overall working principle: Through the precise cooperation of the double clamping parts 106 and the double clamping slots 204, a firm connection is achieved between the crossbeam 1 and the side plate 2. Overall technical effect: It optimizes the connection structure of the cable tray and improves the stability and safety of the cable tray under different working conditions.

[0055] In some examples, both the card portion 106 and the card slot 204 are triangular. In practical applications, when the insert 100 is inserted into the slot 200, the triangular card portion 106 can smoothly slide into the corresponding triangular card slot 204.

[0056] This triangular design has several advantages: First, the triangular shape provides excellent guidance, helping the locking part 106 to engage more accurately and quickly into the locking slot 204, thus improving assembly efficiency. Second, the triangular structure offers high stability; once engaged, it can withstand significant tensile and shear forces, enhancing the stability of the connection.

[0057] For example, in daily use, the cable tray may be subjected to forces from different directions. The triangular locking part 106 and the locking slot 204 can effectively resist these forces and ensure the structural integrity of the cable tray.

[0058] In terms of technical effectiveness, the triangular design of the locking part 106 and the slot 204 significantly improves the accuracy and reliability of the wire trough connection. Overall working principle: Utilizing the guiding property of the triangle, the locking part 106 smoothly engages with the slot 204, forming a stable connection. Overall technical effect: Through the unique triangular structure, the connection performance of the wire trough is optimized, ensuring its stable operation under various conditions.

[0059] In some examples, the inner wall of the slot 200 is provided with a guide bar 205, and the guide bar 205 is slidably disposed in the slot 105. During actual assembly, when the insert 100 is inserted into the slot 200, the guide bar 205 will slide accurately into the slot 105.

[0060] The advantages of this design are as follows: First, the cooperation between the guide bar 205 and the slot 105 further ensures the accuracy and stability of the insertion of the insert 100, preventing the insert 100 from shifting or misaligning during insertion. Second, the guide bar 205 can share some of the lateral force, enhancing the connection strength between the slot 200 and the insert 100.

[0061] For example, during the rapid assembly of the cable tray, the guide bar 205 can quickly guide the insertion part 100 into place, improving assembly efficiency. Simultaneously, during the use of the cable tray, if it is subjected to lateral compression or impact, the guide bar 205 can effectively resist and prevent structural deformation.

[0062] In terms of technical effects, it significantly improves the assembly precision and connection reliability of the cable tray. Overall working principle: Precise guidance and enhanced connection are achieved through the sliding of the guide bar 205 within the slot 105. Overall technical effect: It optimizes the assembly performance and structural strength of the cable tray, ensuring its stable and reliable use.

[0063] In some examples, a guide groove (206) is provided next to the guide bar (205) to guide the card part (106). In the actual assembly process, when the insert (100) is inserted into the slot (200), the card part (106) will move accurately along the guide groove (206).

[0064] The advantages of this design are: First, it ensures that the card part (106) can be accurately inserted into the card slot (204), avoiding deviation or jamming of the card part (106) during insertion, thus improving the efficiency and accuracy of assembly. Second, the guide groove (206) can play a certain limiting role for the card part (106), enhancing the stability of the cooperation between the card part (106) and the card slot (204).

[0065] For example, during the mass production and installation of cable trays, the guide groove (206) can effectively ensure that each locking part (106) can be engaged smoothly and accurately, reducing errors and adjustment time during the assembly process.

[0066] In terms of technical effects, the accuracy and reliability of wire trough assembly are significantly improved. Overall working principle: The guide groove (206) guides the locking part (106), achieving precise and stable engagement between the locking part (106) and the locking groove (204). Overall technical effect: The optimized guide structure improves the assembly quality and performance stability of the wire trough.

[0067] In some examples, all four corners of the insert 100 are chamfered. In practical applications, such as when assembling the insert with the slot, the chamfers play an important role.

[0068] The advantages of this design are twofold: First, the chamfer effectively prevents the sharp corners of the insert from scratching the inner wall of the slot during insertion, protecting the structural integrity of the slot and extending the service life of the wire duct. Second, the chamfer makes the insert easier to insert into the slot, reducing resistance during insertion and improving assembly efficiency.

[0069] For example, on large-scale cable tray production and assembly lines, the presence of chamfers can speed up assembly, reduce component damage caused by scratches, and lower production costs.

[0070] In terms of technical effects, it significantly improves the ease of cable tray assembly and the durability of components. Overall working principle: By setting chamfers at the four corners of the insertion part, smooth insertion is achieved and the inner wall of the slot is protected. Overall technical effect: The simple chamfer design optimizes the assembly process and performance of the cable tray.

[0071] In some examples, the inner wall of the side plate 2 has several reinforcing ribs 207. In practical applications, such as when a large number of cables are laid in the cable tray, or when the cable tray is subjected to external pressure, the reinforcing ribs 207 can significantly enhance the structural strength and rigidity of the side plate 2.

[0072] The advantages of this design are twofold: First, the reinforcing rib 207 can effectively disperse and withstand external forces, reducing the risk of deformation and damage to the side plate 2 and improving the overall durability of the cable tray. Second, it increases the bending and torsional resistance of the side plate 2, enabling it to maintain a stable shape and performance in complex usage environments.

[0073] For example, in industrial environments, cable trays may be subjected to forces and vibrations in different directions. The reinforcing rib 207 can ensure that the side plate 2 is not easily bent or twisted, thereby better protecting the internal cables.

[0074] In terms of technical effects, the mechanical properties of side plate 2 and the reliability of the cable tray are significantly improved. Overall working principle: By setting reinforcing ribs 207 on the inner wall, the ability of side plate 2 to resist external forces and maintain its shape is enhanced. Overall technical effect: The structure of side plate 2 is optimized, ensuring stable operation and long-term use of the cable tray under various working conditions.

[0075] In some examples, the side panel 2 has transverse edges 208 at both the top and bottom. In practical applications, such as when installing and arranging cable trays, the transverse edges 208 at the top and bottom of the side panel 2 play an important role.

[0076] The advantages of this design are twofold: First, the horizontal edge 208 increases the structural strength of the side plate 2, making it more resistant to external pressure and impact, and less prone to deformation. Second, the horizontal edge 208 can serve as a fixing point during cable tray installation, facilitating connection and fixation with other components or installation structures, thus improving installation convenience and stability.

[0077] For example, when installing the cable tray on a wall or bracket, it can be quickly installed through the mounting holes or fixing points on the cross section 208, and the stability of the cable tray after installation can be ensured.

[0078] In terms of technical effects, the performance of side panel 2 and the convenience and reliability of cable tray installation are significantly enhanced. Overall working principle: The horizontal edges 208 at both ends of side panel 2 improve structural strength and facilitate installation and fixing. Overall technical effect: The simple horizontal edge design optimizes the structure and installation performance of the cable tray.

[0079] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. An SMC composite ladder-type bridge, characterized by, The utility model relates to a kind of side plate and crossbeam of being arranged in sequence, including: Crossbeam (1), the crossbeam (1) is sequentially arranged, both ends have insertion part (100); Side plate (2), the side plate (2) is two, and has insertion slot (200), the insertion slot (200) both ends respectively has groove bottom (201) and insertion port (202), two the insertion part (100) of the crossbeam (1) both ends is inserted into the insertion slot (200) of two the side plate (2) respectively; Wherein, the insertion part (100) is board type, and has first arc top pressing part (101) and second arc top pressing part (102), the first arc top pressing part (101) and the second arc top pressing part (102) make the insertion part (100) one side form protrusion (103), the other side forms recess (104);The first arc top pressing part (101) and the second arc top pressing part (102) are located groove bottom (201) side and insertion port (202) side respectively.

2. The SMC composite ladder-type bridge of claim 1, wherein, The insertion port (202) has a plurality of connecting rods (203), and the connecting rods (203) separate the insertion port (202) into a plurality of; The insertion part (100) has a plurality of strip-shaped mouths (105), and the strip-shaped mouths (105) divide the insertion part (100) into a plurality of.

3. The SMC composite ladder-type bridge of claim 2, wherein, The strip-shaped mouth (105) has a clamping portion (106) at one end close to the groove bottom (201), and the groove bottom (201) has a clamping groove (204), and the direction of the clamping groove (204) is perpendicular to the direction of the insertion slot (200).

4. The SMC composite ladder-type bridge of claim 3, wherein, The clamping portion (106) and the clamping groove (204) are both two.

5. The SMC composite ladder-type bridge of claim 3, wherein, The clamping portion (106) and the clamping groove (204) are both triangular.

6. The SMC composite ladder-type bridge of claim 3, wherein, The inner wall of the insertion slot (200) further has a guide strip (205), and the guide strip (205) is slidingly arranged in the strip-shaped mouth (105).

7. The SMC composite ladder-type bridge of claim 6, wherein, The guide strip (205) further has a guide groove (206) beside it, and the guide groove (206) is used for guiding the clamping portion (106).

8. The SMC composite ladder-type bridge of claim 6, wherein, The four corners of the insertion part (100) are provided with chamfers.

9. The SMC composite ladder-type bridge of claim 1, wherein, The inner wall of the side plate (2) has a plurality of reinforcing edges (207).

10. The SMC composite ladder-type bridge of claim 1, wherein, The upper and lower ends of the side plate (2) both have horizontal edges (208).

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