Railway bridge foot plank formed by compression molding of fiber reinforced composite material and mounting structure thereof

Abstract

The utility model provides a railroad bridge foot plank formed by compression molding of a fiber reinforced composite material, the railroad bridge foot plank is integrally formed and comprises a plurality of longitudinal rib type beams and a panel, the panel comprises a first edge and a second edge which are respectively arranged as transverse edges, and a third edge and a fourth edge which are respectively arranged as longitudinal edges, the longitudinal rib type beams are arranged on the back face of the panel, protrude out of the back face of the panel, extend in the longitudinal direction and comprise continuous glass reinforcing materials which are directionally arranged in the longitudinal direction, continuous glass fiber reinforcing materials which are transversely arranged are arranged in the panel, a plurality of flow guide seams are formed in the panel, and the flow guide seams penetrate through the thickness of the panel. And the panel comprises two accommodating grooves, the openings of the accommodating grooves are formed in the front surface of the panel, and the accommodating grooves extend along the longitudinal direction and are respectively close to the third edge and the fourth edge. The utility model provides a foot plank facilitating on-site pavement and an installation structure.

Description

Technical Field

[0001] This disclosure relates to the field of railway bridge ancillary facilities technology, and in particular to a fiber reinforced polymer (FRP) walkway prepared by integral molding process, and a rapid installation structure thereon with bridge supports. Background Technology

[0002] Existing railway bridge pedestrian walkways mostly use concrete or metal modular splicing structures, which have the following drawbacks: 1. Segmented splicing leads to easy water seepage at the joints and poor durability, and requires customized modules for different bridge widths; 2. Traditional materials have high self-weight, increasing the bridge load; 3. Wind displacement resistance stability relies on bolt fixing, resulting in low installation efficiency.

[0003] Existing technologies already include many solutions that utilize SMC composite material sidewalk systems, as exemplified below.

[0004] Patent Document 1: Chinese Patent Publication, Application No. CN201721767463.6, Patent Title: "An SMC Composite Material Sidewalk System", Applicant: Hebei Hengrui Composite Materials Co., Ltd., discloses an SMC composite material sidewalk system, which includes a sidewalk beam, cable trough, cover plate, sidewalk handrail, and sidewalk railing, all integrally molded from SMC composite material. The sidewalk beam is installed on the outside of a retaining wall via a connecting plate. The sidewalk railing posts are installed on the sidewalk beam. The cable trough is installed above the sidewalk beam, and the cover plate is installed on the cable trough. This technical solution uses SMC composite material, which has high compressive and tensile strength and can replace steel plates and angle steel. It can effectively improve the surface gloss of molded products made of this material and has good aging resistance and corrosion resistance.

[0005] Patent Document 2, Chinese Patent Publication No. CN104818673A, entitled "Railway Bridge Pedestrian Board, Installation Structure and Installation Method," applicants: Railway Construction Research Institute of China Academy of Railway Sciences; China Railway Science and Technology Development Corporation; this document discloses a railway bridge pedestrian board, installation structure and installation method. The railway bridge pedestrian board is a composite material pedestrian board with a hollow multi-cavity structure. The length of the railway bridge pedestrian board can be arbitrarily set. The railway bridge pedestrian board can be installed in a longitudinal span of two or more spans. The longitudinal pedestrian boards are clamped together with T-shaped steel, and the T-shaped steel is welded to the installation bracket as a whole. The bottom surface of the pedestrian board has Z-shaped grooves that cooperate with the installation bracket. The sides of the pedestrian board have concave and convex grooves to increase the interlocking between the transverse pedestrian boards. The surface of the board has an anti-slip layer of a resin and quartz sand mixture. Compared with ordinary concrete pedestrian boards, this overcomes the defect of mismatch between the length of the pedestrian board and the spacing of the installation bracket.

[0006] Patent Document 3, Chinese Patent Publication No. CN207646608U, entitled "Composite Material Pedestrian Board for Railway Bridges," applicant: Shaoxing Qingfeng Composite Materials Co., Ltd.; this document discloses a composite material pedestrian board for railway bridges. The pedestrian board includes a board body and a composite material layer covering the outer surface of the board body. The bottom surface of the board body is provided with multiple horizontal ribs and multiple vertical ribs, which are arranged perpendicularly to each other, dividing the bottom surface of the board body into several board body sub-units. Compared with the prior art, this utility model has good toughness, wear resistance, corrosion resistance, insulation and flame retardancy, and is not easily deformed.

[0007] Patent Document 4, Chinese Patent Publication No. CN118148015A, entitled "A Composite Material Railway Bridge Pedestrian Board," applicant: Beijing Yongbang Shengda Chemical Products Co., Ltd., discloses a composite material railway bridge pedestrian board, relating to the field of pedestrian board technology. This composite material railway bridge pedestrian board includes an installation steel beam and a pedestrian board body. The pedestrian board body is composed of multiple parallel pedestrian board units, C-shaped inserts, and D-shaped inserts. The ends of two pedestrian board bodies overlap above an installation steel beam. The pedestrian board body is connected to the installation steel beam below the board body via an adhesive part. A connector is provided between the ends of two pedestrian board bodies. Multiple staggered anti-disengagement buckles are bolted to the lower end face of the pedestrian board body. This patent uses polyurethane, epoxy, and phenolic-based composite materials, which have the advantages of high strength, lightweight, and high corrosion resistance, resulting in a longer service life and easier installation and transportation. The pedestrian board is bonded to the installation steel beam via an adhesive part, ensuring quick installation, stable connection, and high reliability.

[0008] All publicly available literature referenced in this article is incorporated into this article in its entirety. Utility Model Content

[0009] Technical problems to be solved

[0010] The purpose of this disclosure is to provide integrally molded railway bridge pedestrian slabs. Specifically, this disclosure provides larger-sized pedestrian slabs to reduce or eliminate the need for on-site lateral splicing and longitudinal splicing, thereby improving on-site installation efficiency.

[0011] [Technical Solution]

[0012] To achieve the above objectives, a first aspect of this disclosure provides a fiber-reinforced composite compression-molded railway bridge pedestrian slab. The railway bridge pedestrian slab is integrally molded and includes a plurality of longitudinally ribbed beams and a panel. The panel includes a first edge and a second edge, respectively configured as transverse edges, and a third edge and a fourth edge, respectively configured as longitudinal edges. The plurality of longitudinally ribbed beams are disposed on the back of the panel, protruding from the back of the panel and extending longitudinally, including a continuous glass fiber reinforcement material arranged longitudinally. The panel includes transversely arranged continuous glass fiber reinforcement material and is provided with a plurality of guide slots that penetrate the thickness of the panel and are arranged between the longitudinally ribbed beams, extending transversely. The panel includes two receiving grooves, opening on the front of the panel and extending longitudinally, respectively near the third edge and the fourth edge.

[0013] Preferably, the first edge includes an upper extending connecting edge, and the second edge includes a lower extending connecting edge. When two railway bridge walkway panels are connected longitudinally, the upper extending connecting edge of one panel overlaps the lower extending connecting edge of the adjacent panel to fix them to each other by a fixing device.

[0014] Preferably, the upper surface of the upper protruding connecting edge is approximately flush with the upper surface of the panel and is provided with a plurality of upper bolt holes at lateral intervals, and the lower protruding connecting edge is provided with a plurality of lower bolt holes at lateral intervals.

[0015] Preferably, the upper bolt hole and the lower bolt hole are configured as elongated holes extending longitudinally.

[0016] Preferably, the upper bolt holes are arranged in a stepped manner.

[0017] Preferably, the stepped configuration is a three-tiered structure, consisting of a large-diameter elongated oval hole, a medium-diameter elongated oval hole, and a small-diameter elongated oval hole from top to bottom.

[0018] Preferably, the bottom surface of the large-diameter elongated hole is opened in the middle, and the upper edge of the middle opening or the flange around the edge forms an upward protruding flange.

[0019] Preferably, the lowest oblong hole is formed on a thinner base plate.

[0020] Preferably, the first edge and the second edge are provided with interlocking structures. When two railway bridge walkway slabs are laid longitudinally adjacent to each other, the interlocking structures of the adjacent first edge and the second edge can be engaged by pushing to restrict movement at the joint.

[0021] Preferably, the first edge includes an upper protruding half plate and a lower protruding half plate from left to right, and the second edge includes a lower protruding half plate and an upper protruding half plate from left to right, thereby forming a complementary joint when the first edge insertion structure and the second edge insertion structure are inserted into each other.

[0022] Preferably, when the first edge insertion structure and the second edge insertion structure are engaged with each other, a mounting gap is maintained in the longitudinal direction by means of a limiting structure.

[0023] Preferably, the insertion structure has a wedge-shaped guide structure.

[0024] Preferably, there are 3 to 12 longitudinal ribbed beams, and the longitudinal ribbed beams near the third and fourth edges are 20 to 200 mm away from the two side edges, respectively.

[0025] Preferably, multiple groove wall reinforcing ribs are arranged at intervals along the longitudinal direction, and each groove wall reinforcing rib is adjacent to the side wall of the groove and adjacent to the back of the panel to form a triangular rib.

[0026] Preferably, along the longitudinal direction, at the third and / or fourth edges, a plurality of longitudinal edge reinforcing ribs are provided at intervals. Each longitudinal edge reinforcing rib extends from the longitudinal ribbed beam sidewall and the lower surface of the panel of the closest longitudinal edge to the adjacent edge, forming a triangular rib plate perpendicular to the longitudinal direction.

[0027] Preferably, the length of the pedestrian walkway on the railway bridge is 3500mm to 4100mm and the width is less than 1800mm.

[0028] Another aspect of this disclosure provides a railway bridge pedestrian board installation structure, which uses mounting clips to fix any of the railway bridge pedestrian boards in the foregoing aspects to the mounting bracket. The mounting clips are U-shaped clips, with both ends passing through the panel and entering the receiving groove. The two ends are fixed to each other by threaded ends and nuts, or the two ends are fixed by a riveting mechanism.

[0029] Preferably, the mounting buckle is a V-shaped elastic buckle.

[0030] Preferably, the V-shaped elastic buckle is made of spring steel or fiber-reinforced plastic, with an opening angle of 70°-100°.

[0031] Preferably, when the mounting bracket has a limiting plate, a composite material support strip is used to cover the limiting plate to provide stable mounting support.

[0032] [Beneficial technical effects]

[0033] The fiber-reinforced composite material compression molded railway bridge pedestrian slab provided in this disclosure is a lightweight, high-strength integral compression molded pedestrian slab with the following advantages.

[0034] The pedestrian walkway disclosed herein is large in size and can accommodate different paving widths, providing an integral pedestrian walkway of a width adapted to the paving location. In most cases, there is no need for on-site horizontal assembly of the pedestrian walkway, thereby saving labor time and increasing paving stability.

[0035] One-piece molded rib-panel structure: facilitates mold adjustment for pedestrian walkway products.

[0036] Directional fiber reinforcement design: The continuous fiber orientation of longitudinal ribs and transverse panels provides lateral load-bearing capacity. After molding, they are integrated into a single structure, ensuring the strength of the pedestrian slab.

[0037] V-shaped snap-on installation system: enables rapid wind-resistant fixation.

[0038] The longitudinal end joint mechanism of the walking board ensures convenient longitudinal connection and can absorb longitudinal thermal expansion and contraction deformation. Attached Figure Description

[0039] The accompanying drawings illustrate exemplary embodiments of the present disclosure and, together with the description thereof, serve to explain the principles of the present disclosure. These drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification.

[0040] Figure 1 A top view of a railway bridge pedestrian walkway according to one embodiment of the present disclosure is shown, viewed from the front of the walkway;

[0041] Figure 2 A bottom view of a railway bridge pedestrian walkway according to one embodiment of the present disclosure is shown, viewed from the front of the walkway;

[0042] Figure 3 schematically shown Figure 1 and Figure 2 A longitudinal sectional view of the pedestrian walkway of a railway bridge;

[0043] Figure 4 A schematic diagram showing the longitudinal connection status of two railway bridge pedestrian slabs is provided.

[0044] Figure 5 Show Figure 4 A cross-sectional view of the connection between the two railway bridge pedestrian decks, schematically showing the connection structure;

[0045] Figure 6 The installation of two railway bridge pedestrian walkways on the mounting brackets is schematically shown from two different angles in a three-dimensional format.

[0046] Figure 7 The diagram schematically shows two railway bridge walkways installed on mounting brackets in a three-dimensional manner, providing a sectional view of the walkways and enlarged partial views.

[0047] Figure 8 The auxiliary reinforcement structure on the back of the pedestrian walkway of the railway bridge is shown; and

[0048] Figure 9 The diagram schematically illustrates the longitudinal interlocking structure of two railway bridge pedestrian walkways.

[0049] Figure label:

[0050] 10. Flow guide seam

[0051] 12 Anti-slip construction

[0052] 14 Receiving groove

[0053] 15. Narrow groove at the bottom

[0054] 16 First edge (lateral edge, front)

[0055] 18 Second edge (lateral edge, back)

[0056] 22 Third edge (vertical edge, right)

[0057] 24 Fourth edge (vertical edge, left)

[0058] 26 Front Panel

[0059] 30 Panel Back

[0060] 32 panels

[0061] 34. Longitudinal Ribbed Beam

[0062] 40 Panel mounting holes

[0063] 43 Connecting bolts

[0064] 47. Extends from the connecting edge

[0065] 48. Extends from the connecting edge.

[0066] 49. Bolt through hole

[0067] 50 Lower bolt through hole

[0068] 52 Panel connecting nut

[0069] 54 Connector receiving hole

[0070] 60 trough wall reinforcing ribs

[0071] 62. Longitudinal edge reinforcing ribs (longitudinal edge small triangular ribs)

[0072] 70. Half of the board extends upwards.

[0073] 72. Extend half of the board downwards.

[0074] 74. Docking gap

[0075] 100 Railway Bridge Pedestrian Boards

[0076] 200 Mounting bracket

[0077] 210 Installation clips

[0078] 220 Horizontal support frame. Detailed Implementation

[0079] 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 for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0080] It should be noted that, where there is no conflict, the embodiments and features described in this disclosure can be combined with each other. The technical solutions of this disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0081] Unless otherwise stated, the exemplary implementations / embodiments shown are to be understood as providing exemplary features of various details that provide ways in which the technical concepts of this disclosure can be implemented in practice. Therefore, unless otherwise stated, the features of various implementations / embodiments may be additionally combined, separated, interchanged and / or rearranged without departing from the technical concepts of this disclosure.

[0082] The use of crosshairs and / or shading in the accompanying drawings is generally used to clarify the boundaries between adjacent components. Thus, unless otherwise stated, the presence or absence of crosshairs or shading does not convey or indicate any preference or requirement for the specific material, material properties, dimensions, proportions, commonalities between the illustrated components, or any other characteristics, properties, etc., of the components. Furthermore, in the accompanying drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0083] When a component is referred to as being "on" or "above" another component, "connected to," or "joined to" another component, the component may be directly on, directly connected to, or directly joined to the other component, or there may be intermediate components. However, when a component is referred to as being "directly on" another component, "directly connected to," or "directly joined to" another component, there are no intermediate components. Therefore, the term "connection" can refer to a physical connection, an electrical connection, etc., and may or may not have intermediate components.

[0084] For descriptive purposes, this disclosure may use spatial relative terms such as “below,” “under,” “below,” “down,” “above,” “above,” “higher,” and “side (e.g., in a “sidewall”)” to describe the relationship between one component and another component as shown in the accompanying drawings. In addition to the orientations depicted in the drawings, the spatial relative terms are also intended to encompass different orientations of the device during use, operation, and / or manufacture. For example, if the device in the drawings is flipped, a component described as “below” or “under” another component or feature would subsequently be positioned “above” said other component or feature. Thus, the exemplary term “below” can encompass both “above” and “below” orientations. Furthermore, the device may be otherwise positioned (e.g., rotated 90 degrees or in other orientations), thus interpreting the spatial relative descriptive terms used herein accordingly.

[0085] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0086] In the description of this specification, the terms "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment / mode or example, which are included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0087] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0088] The advantages of this disclosure will become clearer in the following description with reference to the accompanying drawings.

[0089] In this embodiment, SMC composite material components are used to provide a railway bridge pedestrian slab 100 that is convenient to be laid on site through a molding process for customized size.

[0090] [Product Description of Walking Board]

[0091] Figure 1 , Figure 2 and Figure 3 The illustration shows a railway bridge pedestrian slab 100 according to an embodiment of the present disclosure. It is made of fiber reinforced composite material through compression molding. Considering the better cost and practicality, the railway bridge pedestrian slab 100 of this embodiment is made of SMC composite material through compression molding.

[0092] Figure 1 Showing the front panel 26, Figure 2 The back of panel 30 is shown for viewing the railway bridge pedestrian walkway 100. Figure 3 schematically shown Figure 1 and Figure 2 A longitudinal sectional view of the railway bridge pedestrian walkway 100.

[0093] The railway bridge pedestrian slab 100 includes multiple integrally formed longitudinally ribbed beams 34 and a panel 32 (panel body). The panel 32 includes a first edge 16 and a second edge 18, which are respectively set as transverse edges, and a third edge 22 and a fourth edge 24, which are respectively set as longitudinal edges. In this document, the longitudinal direction is the direction of railway extension, and the transverse direction is the direction intersecting with the longitudinal direction.

[0094] Longitudinal ribbed beams 34 are disposed on the back of panel 32, protruding from the back of panel 32 and extending longitudinally. The fiber reinforcement material of these multiple longitudinal ribbed beams 34 is mainly arranged longitudinally and mainly uses long fiber bundles, that is, continuous glass fiber reinforcement material.

[0095] The panel 32 contains a large proportion of roughly horizontally arranged fiber reinforcement material, which is roughly evenly distributed within the main body of the panel 32. It mainly uses long fiber bundles, i.e. continuous glass fiber reinforcement material, which intersect in the longitudinal direction.

[0096] Multiple guide slots 10 are distributed within the panel 32, penetrating the thickness of the panel 32 and designed as transversely extending strips. The direction of these guide slots 10 is preferably aligned with the transverse direction, that is, with the direction of the transverse reinforcing fibers within the panel 32, to avoid disrupting the continuity of the long fiber bundle reinforcing material in the extending direction, thereby helping to maintain the overall strength of the panel 32. The guide slots 10 are arranged between the longitudinally ribbed beams 34.

[0097] The drainage seam 10 can quickly drain water from the surface of panel 32, and during the use of railway bridge pedestrian slab 100, it can effectively provide airflow to prevent the formation of vacuum suction on the surface of panel 32 when vehicles pass by, which would cause the railway bridge pedestrian slab 100 to fall off the installation position.

[0098] like Figure 1 As shown, furthermore, a plurality of anti-slip structures 12 are provided on the front side of the panel 32, covering the entire surface. See [reference needed] Figure 1 In this embodiment, the anti-slip structure 12 is an anti-slip ridge structure, with two sets of oriented anti-slip ridges intersecting in alternating directions on the front of the entire panel 32.

[0099] [The receiving groove and mounting structure on the panel]

[0100] like Figure 1 As shown, the panel 32 is also provided with two receiving grooves 14. The receiving grooves 14 open on the front side of the panel 32 and extend longitudinally, respectively near the third edge 22 and the fourth edge 24. The receiving grooves 14 are used to provide panel mounting holes 40 and to accommodate mounting nuts, etc., to prevent the connecting mounting parts from protruding from the front side 26 of the panel and interfering with pedestrian walking when in use.

[0101] Preferably, see Figure 8 The receiving groove 14 is further provided with a bottom narrow groove 15, which is suitable for positioning and drilling on the construction site. The width of the bottom narrow groove 15 matches the thickness of the mounting clip 210. See [reference needed]. Figure 7 .

[0102] Regarding the receiving groove 14, its purpose is to address the difficulty in maintaining precise positioning of the railway bridge walkway 100, particularly the transverse support frame 220, when fixing it to the mounting bracket 200. Pre-forming perforations during molding would cause alignment difficulties during on-site installation. Therefore, by utilizing the receiving groove 14, the railway bridge walkway 100 is laid onto the mounting bracket 200, as... Figure 6 As shown, during on-site installation, holes can be easily and accurately drilled within the receiving groove 14 based on the on-site positioning of the transverse support frame 220. For example... Figure 7As shown, the mounting clip 210 passes through the holes on both sides of the corresponding transverse support frame 220. The mounting clip 210 (U-shaped clip) passes through the holes and spans the transverse support frame 220 of the mounting bracket 200. The mounting clip 210 is fixed in the receiving groove 14 with bolts (not shown in the figure) or rivets. The depth of the receiving groove 14 is suitable for accommodating the above-mentioned mounting structure to avoid interfering with the use of pedestrians on the walkway.

[0103] In a further preferred embodiment, the mounting clip 210 is modified into a V-shaped clip. From Figure 6 Upon closer inspection, the V-shaped clip spans the transverse support frame 220, providing better clamping for the transverse support frame 220.

[0104] Further explanation regarding the V-shaped card:

[0105] - V-shaped elastic buckle: made of spring steel or fiber-reinforced plastic, with an opening angle preferably 70°-100°;

[0106] - The V-shaped clamp forms an interference fit with the bridge support;

[0107] - Anti-wind displacement mechanism: The V-shaped card's double-sided inclined surface generates a self-locking effect, increasing the pressure on the contact surface under wind load.

[0108] [Example of longitudinal connection mechanism for pedestrian walkway]

[0109] Preferred embodiments of this disclosure provide large-size SMC integral molded pedestrian walkway products, particularly railway bridge pedestrian walkway 100 with a long longitudinal span, preferably with a longitudinal length of about 4000 mm.

[0110] The advantages of longitudinally large-size products are: first, improved laying efficiency; second, due to the large span size, railway bridge pedestrian slabs 100 are laid on mounting brackets 200, such as... Figure 6 As shown, it can be supported by at least 3 transverse support frames 220, thereby reducing the risk of paving collapse caused by the detachment of individual transverse support frames 220.

[0111] However, the longitudinal connection mechanism for large-sized products needs to address the issue of thermal expansion and contraction during use. This disclosure provides a special longitudinal connection mechanism.

[0112] See appendix for further details. Figure 3The diagram shows a front view of a railway bridge walkway 100, which has upper and lower edge extension mechanisms on its front and rear edges, respectively. Specifically, the first edge 16 includes an upper extending connecting edge 47, and the second edge 18 includes a lower extending connecting edge 48. When the railway bridge walkway 100 is laid flat, the upper extending connecting edge 47 extends from the upper side of the plate, and the lower extending connecting edge 48 extends from the lower side of the plate. The upper surface of the upper extending connecting edge 47 is approximately flush with the upper surface of the panel 32, and a plurality of upper bolt holes 49 are provided at lateral intervals. Similarly, the lower extending connecting edge 48 is provided with a plurality of lower bolt holes 50 at lateral intervals. When multiple railway bridge walkways 100 are connected longitudinally in pairs, the first edge 16 of one railway bridge walkway 100 is aligned with the second edge 18 of another railway bridge walkway 100, that is, the upper extending connecting edge 47 and the lower extending connecting edge 48 are overlapped. The upper bolt holes 49 and the lower bolt holes 50 are elongated holes extending longitudinally.

[0113] The upper protruding connecting edge 47 is provided with multiple upper bolt through holes 49, and the lower protruding connecting edge 48 is provided with multiple lower bolt through holes 50. The two are arranged to be aligned in the installation position. During installation, the bolts are passed through the aligned two holes.

[0114] There is a pre-embedded nut at the bottom of the bolt hole 50. The bolt hole 50 is an elongated oval hole that is lengthened in the longitudinal direction.

[0115] Further optimization involves a stepped design for the upper bolt hole 49, with the structure from top to bottom consisting of a large-diameter oblong hole, a medium-diameter oblong hole, and a small-diameter oblong hole. Regarding the stepped hole of the upper bolt hole 49, as... Figure 5 As shown, the design is tiered from top to bottom. The upper hole is a large-diameter hole or a large-diameter oblong hole, providing initial guidance during bolt installation and accommodating nuts and mounting sleeves. The lower surface of this large-diameter hole or oblong hole receives the nut or washer, while its central portion is a smaller hole (medium-diameter oblong hole or small-diameter oblong hole). A raised ring is provided on this lower surface, or an upwardly protruding edge or flange is provided around the edge of the smaller hole to reduce lateral friction of the received nut or washer. The smaller hole extends downwards to form a second stepped hole.

[0116] The lowest small-diameter elongated oval hole is formed in a relatively thin bottom layer, for example, with a thickness of about 1 mm. A minimum hole, which is a longitudinally elongated oval hole, is set in the center of the bottom of this smaller hole. The short diameter of this hole matches the bolt size, providing positioning and fixing for the bolt. This 1 mm thick bottom wall and elongated oval hole design are designed to allow for bolt displacement when the railway bridge walkway 100 undergoes thermal expansion and contraction due to changes in ambient temperature during installation. If the elongated oval hole cannot meet the displacement requirements, the bolt can further cut through this 1 mm thick bottom wall to continue displacement.

[0117] [Example of variations in the longitudinal connection mechanism of the pedestrian walkway]

[0118] like Figure 9 For example, the first edge 16 and the second edge 18 of the railway bridge pedestrian slab 100 are provided with interlocking structures, and two protruding half-plates are staggered vertically on the first edge 16, such as... Figure 9 The railway bridge pedestrian slab 100 on the left shows its first edge 16, which includes an upper protruding half-slab 70 and a lower protruding half-slab 72. Figure 9 Also shown is another railway bridge pedestrian deck 100 connected to it, showing the upper protruding half 70 of its second edge 18, whose upper and lower intersecting lower protruding half 72 are covered.

[0119] When two railway bridge walkway slabs 100 are laid adjacent to each other in the longitudinal direction, the adjacent first edge 16 and second edge 18 can be made to cooperate with each other by pushing them in the roughly horizontal direction in the longitudinal direction, thereby restricting the movement of the joint.

[0120] Furthermore, preferably, the protruding ends of the upper protruding half-plate 70 and the lower protruding half-plate 72 can be chamfered or wedge-shaped to guide the insertion operation and facilitate the joining operation. Additionally, it is preferable to provide mounting limiting protrusions (not shown in the figure) on the upper protruding half-plate 70 and / or the lower protruding half-plate 72 to maintain a mating gap 74 after insertion, absorbing thermal expansion and contraction changes of the material laid over long distances. The limiting protrusion ensures the mating gap during installation, but allows further displacement of the upper protruding half-plate 70 and / or the lower protruding half-plate 72 under longitudinal pressure.

[0121] Since the above-mentioned gap 74 is an overlap in two opposite ways, one near the inner edge and the other near the outer edge, the two pairs of overlapping plates restrain each other. In use, when pedestrians walk from both directions to approach the joint or the junction of the two railway bridge walkway 100, the ends of the joint are not prone to warping.

[0122] This preferred embodiment has a relatively simple configuration and the mold is easy to handle. Its design configuration can also be changed, as long as the joining mechanism has a similar effect, it can be incorporated into the technical variations of this disclosure.

[0123] [Enhanced Construction]

[0124] like Figure 2 As shown, the reinforcement structure of the railway bridge pedestrian slab 100 is provided on the back side 30 of the panel.

[0125] The main reinforcing structure consists of a plurality of longitudinally ribbed beams 34, for example, 3 to 12, spaced apart between the third edge 22 and the fourth edge 24, with one beam close to each of the two longitudinal edges (22, 24) at a distance of 20 to 200 mm from the two edges.

[0126] like Figure 8The diagram shows a partial sectional perspective view of a railway bridge pedestrian walkway 100, illustrating its cross-section. A receiving groove 14 is provided with a narrow bottom slot 15, suitable for drilling and positioning, the width of which corresponds to the roughness of the mounting clip 210. The receiving groove 14 may reduce product strength; therefore, reinforcement mechanisms are provided on both sides. One side of the receiving groove 14 is adjacent to a longitudinally ribbed beam 34, thereby achieving a reinforcement effect. On the other side of the receiving groove 14, a plurality of groove wall reinforcing ribs 60 are longitudinally spaced, each groove wall reinforcing rib 60 adjacent to the outer side wall of the receiving groove 14 and adjacent to the back surface 30 of the panel, extending perpendicularly to the longitudinal direction, forming small triangular ribs.

[0127] The longitudinally ribbed beam 34 of the closest longitudinal edge (third edge 22, fourth edge 24) extends from its sidewall and the lower surface of the panel 32 to the adjacent longitudinal edge (third edge 22, fourth edge 24), forming a triangular rib perpendicular to the longitudinal direction, thereby providing reinforcement to the edge.

[0128] The aforementioned reinforcement mechanism not only strengthens the panel 32 of the railway bridge walkway 100, but also reduces the thickness of the panel 32, lightens the weight of the product, and lowers material costs.

[0129] [Preferred Laying Size]

[0130] In a preferred embodiment, this disclosure provides a large-size, one-piece molded railway bridge walkway 100. In particular, this disclosure provides a solution for products of predetermined sizes, thereby improving the laying efficiency at the construction site.

[0131] The width of the railway bridge pedestrian slab 100, or the width of the panel 32, can be set to match the width of the passage to be laid. This setting is achieved by using customized or selected products with width requirements provided by the customer. The manufacturer adjusts the mold settings to achieve the optimal product and combination, thereby effectively reducing on-site construction time during installation. For example, a single railway bridge pedestrian slab 100, made of SMC composite material, is integrally molded in one piece, preferably 3500mm to 4100mm in length, for example, with a length of 4000mm. When the width of the pedestrian walkway is less than 1050mm, a railway bridge pedestrian slab 100 product of the corresponding width can be provided, and a single slab can be laid in the width direction. When the pedestrian walkway requires a width greater than 1050mm, railway bridge pedestrian slab 100 products for combined use in the width direction must be provided.

[0132] The 4000mm long railway bridge walkway 100 provided for long-span laying in the longitudinal direction has the advantage that, during actual paving, it can span more of the support beams of the mounting brackets, thus being fixed to at least three support beams. Even if one support beam suddenly fails, the railway bridge walkway 100 will not break or fall, thereby improving personnel safety and reducing or avoiding safety accidents.

[0133] [Materials and Processing Examples]

[0134] Further process examples are illustrated below:

[0135] 1. Structural Design

[0136] - Ribbed beam: Multiple longitudinal reinforcing ribs are arranged parallel to the railway line, and the interior is axially reinforced with continuous glass fiber (≥60wt%);

[0137] - Panel layer: Continuous glass fiber (≥50wt%) laid perpendicular to the direction of the ribs;

[0138] - Integral molding: The fiber and resin (preferably unsaturated polyester or vinyl ester) are cured and molded in one step using the SMC / BMC molding process.

[0139] Regarding SMC composite materials

[0140] SMC is short for Sheet Molding Compounds, which are composites made by combining resin paste, chopped glass fibers and / or continuous glass fibers to form sheets, which are then molded into the desired products under high temperature and pressure in a mold.

[0141] The SMC composite material used to prepare the pedestrian walkway of this railway bridge includes at least a continuous glass fiber distributed in the longitudinal ribbed beam 34, the orientation of which is consistent with the longitudinal direction of the walkway (i.e. the railway laying direction), and an upper layer including continuous glass fibers, wherein the arrangement direction of the continuous glass fibers in the upper layer is approximately intersecting the longitudinal direction and distributed within the panel 32.

[0142] It should be noted that the continuous glass fiber described here refers to relatively long glass fibers. Continuous glass fibers are formed through a drawing process, typically involving winding the fibers in a drawing machine for several tens of minutes during production. The technical term opposite to continuous glass fiber is "chopped glass fiber," which refers to continuous glass fibers cut into short fibers, for example, a few centimeters in length. Traditional SMC sheets only provide a layer of chopped glass fiber. Chopped glass fibers are easy to flow and readily mix with the plastic components in the composite material, providing uniform reinforcement.

[0143] Furthermore, the continuous glass fibers used in this disclosure differ from "glass fiber mesh." Continuous glass fibers can be used to weave twisted or untwisted glass fiber cloth, which possesses exceptional strength and can thus provide excellent localized reinforcement for products. However, the fibers in glass fiber mesh are intertwined and constrained, resulting in poor flowability and significantly reduced or even non-dispersible dispersion. This can negatively impact molding processes, particularly in products with numerous grooves in the mold, making it difficult to provide reinforcement for the corresponding groove structures. In contrast, the continuous glass fibers in this disclosure are unwoven, meaning that the continuous length of glass fibers is generally relatively independent. Due to the lack of constraint between the continuous glass fibers, they exhibit excellent mobility compared to glass fiber mesh and are less likely to obstruct the movement of chopped fibers in adjacent chopped fiber layers. Continuous fibers can easily enter parallel grooves in the mold during molding and can also relatively easily enter smaller mold cavities in a bent manner. By utilizing the added continuous glass fiber layers, the strength of the product component is improved compared to products manufactured using conventional SMC processes.

[0144] [Materials and Performance Testing for Examples]

[0145] In one application embodiment of this disclosure, the product material contains both chopped glass fibers and continuous long glass fibers, with a total glass fiber content of 50%, of which the chopped glass fiber content is 15-20% and the continuous glass fiber content is 30%-35%. The tensile strength is >300 MPa, the flexural strength is >450 MPa, the flexural modulus of elasticity is >23 GPa, and the impact toughness is >220 KJ / m2.

[0146] Short chopped glass fibers provide isotropic mechanical strength, while continuous long glass fibers provide directional mechanical strength, thus directionally reinforcing the overall structure. The continuous long glass fibers arranged within the longitudinally ribbed beam 34 are aligned with the length direction of this reinforcement configuration. Since the support direction of the railway bridge pedestrian slab 100 is perpendicular to the length direction of the longitudinally ribbed beam 34, the continuous glass fibers within the longitudinally ribbed beam 34 provide directional reinforcement of its supporting force. The continuous glass fibers within the panel 32 intersect perpendicularly with the extension direction of the longitudinally ribbed beam 34, providing directional reinforcement to the panel 32. After the continuous glass fibers are intersected, the transverse tensile strength of the railway bridge pedestrian slab 100 increases by more than three times compared to the original.

[0147] [Installation Condition Test]

[0148]

[0149] Although embodiments have been specifically described with reference to the accompanying drawings for purposes of description and illustration, it should be understood that the disclosed processing methods and apparatus are not intended to limit this application. Various modifications to the foregoing embodiments will be readily apparent to those skilled in the art without departing from the scope of this disclosure.

Claims

1. A fiber-reinforced composite material compression molded railway bridge pedestrian slab, characterized in that: The railway bridge pedestrian slab is integrally formed, comprising multiple longitudinally ribbed beams and a panel. The panel includes a first edge and a second edge, which are respectively configured as horizontal edges, and a third edge and a fourth edge, which are respectively configured as vertical edges. The plurality of longitudinally ribbed beams are disposed on the back of the panel, protruding from the back of the panel and extending longitudinally, and include continuous glass reinforcement material arranged longitudinally. The panel includes a continuous glass fiber reinforcement material arranged laterally and is provided with a plurality of flow guide slots that penetrate the thickness of the panel and are arranged between the longitudinal ribbed beams, extending laterally. The panel also includes two receiving grooves that open on the front of the panel and extend longitudinally, respectively near the third edge and the fourth edge.

2. The railway bridge pedestrian slab according to claim 1, characterized in that, The first edge includes an upper extending connecting edge, and the second edge includes a lower extending connecting edge. When two railway bridge walkway panels are connected longitudinally, the upper extending connecting edge of one panel overlaps the lower extending connecting edge of the adjacent panel to fix them to each other by a fixing device.

3. The railway bridge pedestrian slab according to claim 2, characterized in that, The upper surface of the upper protruding connecting edge is roughly flush with the upper surface of the panel, and multiple upper bolt holes are provided at horizontal intervals along the side; and multiple lower bolt holes are provided at horizontal intervals along the lower protruding connecting edge.

4. The railway bridge pedestrian slab according to claim 3, characterized in that, The upper bolt hole and the lower bolt hole are configured as elongated holes extending longitudinally.

5. The railway bridge pedestrian slab according to claim 4, characterized in that, The upper bolt holes are arranged in a stepped manner.

6. The railway bridge pedestrian slab according to claim 5, characterized in that, The stepped design is a three-tiered structure, consisting of a large-diameter oblong hole, a medium-diameter oblong hole, and a small-diameter oblong hole from top to bottom.

7. The railway bridge pedestrian slab according to claim 6, characterized in that, The large-diameter elongated hole has an opening in the middle of its lower bottom surface, and an upwardly protruding flange is formed on the upper edge of the opening or around the edge.

8. The railway bridge pedestrian slab according to claim 5, characterized in that, The oblong hole at the bottom is made on a thinner base plate.

9. The railway bridge pedestrian slab according to claim 1, characterized in that, The first edge and the second edge are provided with interlocking structures. When two railway bridge walkway slabs are laid longitudinally adjacent to each other, the interlocking structures of the first edge and the second edge can be engaged by pushing to restrict movement at the joint.

10. The railway bridge pedestrian slab according to claim 9, characterized in that, The first edge includes an upper protruding half plate and a lower protruding half plate from left to right, and the second edge includes a lower protruding half plate and an upper protruding half plate from left to right.

11. The railway bridge pedestrian slab according to claim 9, characterized in that, When the first edge insertion structure and the second edge insertion structure are engaged with each other, an installation gap is maintained in the longitudinal direction by means of a limiting structure.

12. The railway bridge pedestrian slab according to claim 9, characterized in that, The insertion structure has a wedge-shaped guide structure.

13. The railway bridge pedestrian slab according to claim 1, characterized in that, The plurality of longitudinal ribbed beams consists of 3 to 12 beams, with the longitudinal ribbed beams near the third and fourth edges being 20 to 200 mm away from the two edges, respectively.

14. The railway bridge pedestrian slab according to claim 1, characterized in that, Multiple reinforcing ribs are arranged longitudinally at intervals, and each reinforcing rib is adjacent to the side wall of the receiving groove and adjacent to the back of the panel to form a triangular rib.

15. The railway bridge pedestrian slab according to claim 1, characterized in that, Along the longitudinal direction, at the third edge and / or the fourth edge, a plurality of longitudinal edge reinforcing ribs are provided at intervals. Each longitudinal edge reinforcing rib extends from the longitudinal ribbed beam sidewall and the lower surface of the panel of the nearest longitudinal edge to the adjacent edge, forming a triangular rib plate perpendicular to the longitudinal direction.

16. The railway bridge pedestrian slab according to claim 1, characterized in that, The railway bridge pedestrian walkway is 3500mm to 4100mm long and less than 1800mm wide.

17. A construction method for installing pedestrian walkways on railway bridges, characterized in that, The railway bridge walkway board according to any one of claims 1-16 is fixed to the mounting bracket by an installation buckle. The installation buckle is a U-shaped buckle with both ends passing through the panel and entering the receiving groove. The two ends are fixed to each other by a threaded end and a nut, or the two ends are fixed by a riveting mechanism.

18. The railway bridge pedestrian slab installation structure according to claim 17, characterized in that, The mounting clip is a V-shaped elastic clip.

19. The railway bridge pedestrian slab installation structure according to claim 18, characterized in that, The V-shaped elastic buckle is made of spring steel or fiber-reinforced plastic, with an opening angle of 70°-100°.

20. The railway bridge pedestrian slab installation structure according to claim 17, characterized in that, When the mounting bracket has a limiting plate, a composite material support strip is used to cover the limiting plate to provide stable mounting support.

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