Telescopic bridge sidewalk handrail suitable for bridge expansion joint

Abstract

The utility model relates to a telescopic bridge sidewalk handrail applicable to a bridge expansion joint, which is arranged between a main bridge and an approach bridge and positioned on two sides of a bridge pavement, handrail columns are arranged on two sides of the main bridge and the approach bridge, and the telescopic bridge sidewalk handrail is positioned in the expansion joint between the main bridge and the approach bridge. Comprising a plurality of vertical rods and telescopic assemblies, the adjacent vertical rods are connected through the telescopic assemblies, and the stand columns are connected with the adjacent vertical rods through the telescopic assemblies; the telescopic assembly comprises a rhombic adjusting piece, the two adjacent edges of the rhombic adjusting piece are rotationally connected, one end of the rhombic adjusting piece is rotationally fixed to the vertical rod, and the opposite end of the rhombic adjusting piece is rotationally fixed to the adjacent vertical rod or the railing stand column. Compared with the prior art, the device has the advantages of simple structure, stability, reliability, convenience in implementation and the like.

Description

Technical Field

[0001] The utility model relates to the field of bridge engineering, in particular to a retractable bridge sidewalk handrail based on an applicable bridge expansion joint. Background Art

[0002] Long-span suspension bridges (main spans exceeding 150 meters), cable-stayed bridges, and arch bridges are increasingly being used across the vast expanses of major rivers. Influenced by factors such as temperature, live loads, braking forces, earthquakes, and concrete shrinkage and creep, large-span bridges often use large-displacement expansion joints, with longitudinal expansion ranging from over 240mm to as much as 2000mm.

[0003] In the past, long-span bridges were mostly used in highway bridge projects, and sidewalks were not required on the bridges; only maintenance roads were required. In recent years, with the development of urbanization, many long-span bridges are located in densely populated areas in urban areas or near urban areas, and sidewalks are required on the bridges. According to Section 9.5 of the "Code for Design of Urban Bridges" (CJJ 11-2011), "the height of the railings on the side of the sidewalk or safety belt facing the air should not be less than 1.10m. The maximum clear spacing between the vertical members of the railings shall not exceed 110mm, and structures with tread surfaces should not be used." The need for sidewalk railings to span large displacement expansion joints has become a problem.

[0004] In the past, bridge sidewalk railings across expansion joints typically employed two methods: 1. Multiple horizontal crossbars with telescopic sleeves; 2. Multiple horizontal chains. These two methods presented problems: 1. When the expansion joint width was wide, the horizontal crossbars with telescopic sleeves could not withstand the required loads and could not accommodate the bridge's transverse and vertical deformation, easily causing damage; 2. Both the horizontal crossbars and the horizontal chains acted as treads, posing a risk of climbing.

[0005] Therefore, it is necessary to design a sidewalk railing form that can simultaneously meet the large displacement and expansion of the longitudinal bridge and mainly uses vertical bars. Utility Model Content

[0006] The purpose of this utility model is to overcome the above-mentioned defects that most of the sidewalk railings in the prior art adopt a retractable horizontal cross bar structure, but the cross bar constitutes a tread that people can climb, and there is a problem that the vertical setting cannot be unified to adapt to the changes in the spacing of the expansion joints. The utility model provides a retractable bridge sidewalk railing that can simultaneously meet the large longitudinal bridge displacement and expansion and contraction and is mainly composed of vertical bars.

[0007] The purpose of the utility model can be achieved through the following technical solutions:

[0008] A retractable bridge sidewalk railing suitable for bridge expansion joints is arranged between the main bridge and the approach bridge and is located on both sides of the bridge road surface. Both sides of the main bridge and the approach bridge are provided with railing columns. The retractable bridge sidewalk railing is located in the expansion joint between the main bridge and the approach bridge, and includes multiple vertical rods and a retractable assembly. Adjacent vertical rods are connected by the retractable assembly, and the columns are connected to adjacent vertical rods by the retractable assembly; the retractable assembly includes a diamond-shaped adjusting piece, and two adjacent sides of the diamond-shaped adjusting piece are rotatably connected. One end of the diamond-shaped adjusting piece can be rotatably fixed on the vertical rod, and the opposite end can be rotatably fixed on the adjacent vertical rod or railing column.

[0009] Preferably, the diamond-shaped adjusting member includes a first type of diamond-shaped adjusting member and a second type of diamond-shaped adjusting member, the two ends of the first type of diamond-shaped adjusting member are respectively connected to two adjacent vertical rods, one end of the second type of diamond-shaped adjusting member is connected to the vertical rod, and the opposite end is connected to the railing column; the first type of diamond-shaped adjusting member and the second type of diamond-shaped adjusting member are both diamond-shaped structures, including a first telescopic piece, a second telescopic piece, a third telescopic piece and a fourth telescopic piece which are rotatably connected in sequence from head to tail.

[0010] Preferably, the telescopic assembly also includes a pin and a limit nut, both ends of the pin are provided with threads, both ends of the pin are respectively threadedly connected to the limit nuts, the adjacent telescopic pieces of the diamond structure are rotatably connected by the pin, and the telescopic pieces of the diamond structure are located between the limit nuts.

[0011] Preferably, a through hole matching with the pin is provided on the vertical rod, and one end of the pin passes through the through holes of the telescopic piece and the vertical rod and is connected to a limiting nut.

[0012] Preferably, the distance between adjacent vertical rods is greater than or equal to the diameter of the pin shaft and less than or equal to 110 mm.

[0013] Preferably, the pin shaft and the through hole of the vertical rod are in clearance fit, the expansion piece with diamond structure is provided with a connecting hole, and the pin shaft and the connecting hole are in clearance fit.

[0014] Preferably, the telescopic assembly includes a plurality of diamond-shaped adjusting members, and each diamond-shaped adjusting member is symmetrically distributed on both sides of the vertical rod.

[0015] Preferably, both ends of the vertical rod are connected to telescopic components respectively, the axis of the telescopic component at the upper end of each vertical rod is perpendicular to the vertical rod, and the axis of the telescopic component at the lower end of each vertical rod is perpendicular to the vertical rod.

[0016] Preferably, there are multiple railing posts, each of which is vertically fixed on the bridge deck, and a railing handrail is provided at the upper end of each railing post. The railing handrail is vertically connected to the railing post, and a gap is provided between the railing handrails on the main bridge and the approach bridge.

[0017] Preferably, railing cross bars and railing vertical bars are provided between adjacent railing uprights on the main bridge or approach bridge, and both ends of the railing vertical bars are respectively vertically connected to the railing cross bars, and both ends of the railing cross bars are respectively vertically connected to the railing uprights.

[0018] Compared with the prior art, the utility model has the following advantages:

[0019] (1) This scheme sets up guardrail columns on the main bridge and the approach bridge at positions close to both sides of the expansion joint, and connects the vertical bars through the diamond-shaped adjusting parts of the telescopic assembly to form a retractable bridge sidewalk guardrail. The two ends of the retractable bridge sidewalk guardrail can be rotated to connect the guardrail columns of the main bridge and the approach bridge respectively; the expansion joint between the main bridge and the approach bridge is shortened or extended, and the length of the diagonal of the diamond-shaped adjusting parts is adjusted by rotating the sides of the diamond-shaped adjusting parts, so that the spacing between the vertical bars changes, and the length of the entire retractable bridge sidewalk guardrail changes to adapt to the span change of the bridge expansion joint.

[0020] By arranging multiple vertical rods and telescopic components, and connecting the vertical rods with the diamond-shaped adjusting pieces in the telescopic components, a retractable sidewalk railing is formed to be arranged between the expansion joints of the bridge. The retractable sidewalk railing is arranged at the position of the expansion joint of the bridge, and its two ends are respectively fixed on the railing columns of the main bridge and the approach bridge; when the spacing of the expansion joint changes, force is applied to the diamond-shaped adjusting piece to change the diagonal length of the diamond-shaped adjusting piece, and then the spacing between the vertical rods on both sides is adjusted, so that the retractable sidewalk railing can adapt to the expansion joint. Moreover, each vertical rod is arranged vertically, which can form protection while avoiding the formation of treads, thereby achieving the unity of safety and adaptability.

[0021] (2) This solution uses adjustable diamond-shaped adjustment pieces to connect vertical vertical rods, and a retractable bridge sidewalk railing is obtained by connecting them in series. The sidewalk railing is set in the bridge expansion joint, and the two ends of the sidewalk railing are respectively connected to the railing columns on the main bridge and the approach bridge for fixing. The retractable bridge sidewalk railing has a simple structure and is easy to construct and install. In addition, multiple sets of telescopic components are arranged side by side between two adjacent vertical rods, so that the vertical rods can stably change their spacing. The structure of the sidewalk railing is stable and reliable, and can adapt to the spacing changes of the bridge expansion joint, and its durability is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of the sidewalk railing provided by the utility model;

[0023] Figure 2 This is a structural diagram of the telescopic structure of the handrail provided by the utility model in a tightened state;

[0024] Figure 3 This is a structural diagram of the railing structure provided by the utility model in the maximum open state;

[0025] Figure 4 for Figure 1 Middle AA section view;

[0026] Figure 5 for Figure 1 Middle BB cross-section;

[0027] Figure 6 for Figure 1 Middle CC section view;

[0028] Figure 7 This is a front view of the telescopic assembly provided by the utility model;

[0029] Figure 8 A cross-sectional view of the telescopic assembly provided by the utility model;

[0030] In the figure: 1. vertical rod, 2. telescopic assembly, 3. railing handrail, 4. railing column, 5. railing cross bar, 6. railing vertical rod, 7. main bridge, 8. approach bridge, 20. diamond-shaped adjustment member, 21. first telescopic piece, 22. pin shaft, 23. limit nut, 24. second telescopic piece, 25. third telescopic piece, 26. fourth telescopic piece. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0035] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0036] Furthermore, terms such as "horizontal" and "vertical" do not necessarily mean that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0037] Example 1

[0038] like Figures 1 to 3 As shown, this embodiment provides a retractable bridge sidewalk railing suitable for bridge expansion joints, which is arranged between the main bridge 7 and the approach bridge 8 and is located on both sides of the bridge pavement. Railing columns 4 are provided on both sides of the main bridge 7 and the approach bridge 8. The retractable bridge sidewalk railing is located in the expansion joint between the main bridge 7 and the approach bridge 8, and includes a plurality of vertical rods 1 and a telescopic assembly 2. Adjacent vertical rods 1 are connected by the telescopic assembly 2, and the columns 4 are connected to adjacent vertical rods 1 by the telescopic assembly 2; the telescopic assembly 2 includes a diamond-shaped adjusting member 20, and the two adjacent sides of the diamond-shaped adjusting member 20 are rotatably connected. One end of the diamond-shaped adjusting member 20 can be rotatably fixed on the vertical rod 1, and the opposite end can be rotatably fixed on the adjacent vertical rod 1 or the railing column 4.

[0039] Working principle: Railing columns 4 are set on the main bridge 7 and the approach bridge 8 and near the positions on both sides of the expansion joint, and the vertical rods 1 are connected through the diamond-shaped adjustment parts 20 of the telescopic assembly 2 to form a retractable bridge sidewalk railing. The two ends of the retractable bridge sidewalk railing can be rotatably connected to the railing columns 4 of the main bridge 7 and the approach bridge 8 respectively; the expansion joint between the main bridge 7 and the approach bridge 8 is shortened or extended, and the length of the diagonal of the diamond-shaped adjustment part 20 is adjusted by rotating the sides of the diamond-shaped adjustment part 20, so that the spacing between the vertical rods 1 changes, and the length of the entire retractable bridge sidewalk railing changes to adapt to the span change of the bridge expansion joint.

[0040] By arranging multiple vertical rods 1 and telescopic components 2, and using the diamond-shaped adjusting members 20 in the telescopic components 2 to connect the vertical rods 1, a retractable sidewalk railing arranged between the expansion joints of the bridge is formed. The retractable sidewalk railing is arranged at the position of the expansion joint of the bridge, and its two ends are respectively fixed on the railing columns 4 of the main bridge 7 and the approach bridge 8; when the spacing of the expansion joint changes, force will be applied to the diamond-shaped adjusting member 20 to change the diagonal length of the diamond-shaped adjusting member 20, and then the spacing between the vertical rods 1 on both sides is adjusted, so that the retractable sidewalk railing can adapt to the expansion joint. Moreover, each vertical rod is arranged vertically, which can form protection while avoiding the formation of treads, thereby achieving the unity of safety and adaptability.

[0041] Specifically, if Figures 4 to 8 As shown, the diamond adjusting member 20 includes a first type of diamond adjusting member and a second type of diamond adjusting member. The two ends of the first type of diamond adjusting member are respectively connected to two adjacent vertical rods 1, and one end of the second type of diamond adjusting member is connected to the vertical rod 1, and the opposite end is connected to the railing column 4; the first type of diamond adjusting member and the second type of diamond adjusting member are both diamond structures, including a first expansion piece 21, a second expansion piece 24, a third expansion piece 25 and a fourth expansion piece 26 that are rotatably connected in sequence at the head and tail.

[0042] The telescopic assembly 2 further includes a pin 22 and a limit nut 23. The pin 22 has threads at both ends, and both ends of the pin 22 are threadedly connected to the limit nuts 23. Adjacent diamond-shaped telescopic pieces are rotatably connected via the pin 22, with the diamond-shaped telescopic pieces located between the limit nuts 23. A through hole is provided on the vertical rod 1 to match the pin 22. One end of the pin 22 passes through the through holes in the telescopic piece and the vertical rod 1 and is then connected to the limit nut 23.

[0043] The pin shaft 22 is clearance-matched with the through hole of the vertical rod 1 , and a connecting hole is provided on the expansion piece of the diamond structure, and the pin shaft 22 is clearance-matched with the connecting hole.

[0044] Here, the force on the railing is mainly borne by the vertical rods and telescopic components. In actual application, the gap size should be combined with the calculated load of the railing in the urban bridge design specifications to verify and determine the specific structural dimensions of each component of the vertical rods and telescopic components.

[0045] The installation gap of the telescopic railing can refer to the installation method of the modular expansion joint. The initial gap during installation can be determined by combining the operating temperature range of the bridge and the temperature during railing installation. At the same time, the expansion amount of the telescopic sidewalk railing should be selected with a certain margin to avoid the railing being squeezed or broken and causing damage.

[0046] Optionally, since the telescopic assembly can adapt to vertical deformation, if a certain gap is reserved or a ball joint is set at the pin shaft, it can also adapt to certain transverse deformation of the bridge. Therefore, it can adapt to the vertical and transverse deformation of the main bridge and the approach bridge or the abutment, and the durability of the telescopic sidewalk railing is greatly improved.

[0047] In a preferred embodiment, the telescopic assembly 2 includes a plurality of diamond-shaped adjustment members 20, each symmetrically distributed on either side of the vertical rod 1. The vertical rod 1 is connected to the telescopic assembly 2 at both ends, with the axis of the telescopic assembly 2 at the upper end of each vertical rod 1 perpendicular to the vertical rod 1, and the axis of the telescopic assembly 2 at the lower end of each vertical rod 1 perpendicular to the vertical rod 1.

[0048] The vertical bars are connected in series using adjustable diamond-shaped adjustment pieces to form a retractable bridge sidewalk railing. The sidewalk railing is set in the bridge expansion joint and the two ends of the sidewalk railing are respectively connected to the railing columns on the main bridge and the approach bridge for fixing. The retractable bridge sidewalk railing has a simple structure and is easy to construct and install. Multiple sets of telescopic components are arranged side by side between two adjacent vertical bars, so that the vertical bars can stably change the spacing, and the structure of the sidewalk railing is stable and reliable.

[0049] Specifically, there are multiple railing posts 4, each of which is vertically fixed on the bridge deck. A railing handrail 3 is provided at the upper end of each railing post 4, and the railing handrail 3 is vertically connected to the railing post 4. A gap is provided between the railing handrails 3 on the main bridge 7 and the approach bridge 8.

[0050] Among them, railing cross bars 5 and railing vertical bars 6 are provided between adjacent railing columns 4 on the main bridge 7 or the approach bridge 8, and the two ends of the railing vertical bars 6 are respectively vertically connected to the railing cross bars 5, and the two ends of the railing cross bars 5 are respectively vertically connected to the railing columns 4.

[0051] During the specific implementation process, the number of sections of the telescopic railing is first determined based on the expansion and contraction requirements of the main bridge structure. The expansion and contraction should be selected with a certain margin to avoid the railing being squeezed or pulled apart, causing damage. Then, based on the railing form and force requirements of the main bridge structure, the structural dimensions and connection method of the telescopic railing vertical bars and telescopic components are calculated and determined, and specific design drawings and design instructions are given. After that, according to the design drawings and design instructions given in the previous step, the railing is manufactured in the factory. The selection of materials, construction and acceptance must meet the relevant construction specifications and design requirements, and anti-corrosion coating must be completed. Finally, after the bridge railings on both sides of the expansion joint are installed on site, the initial installation gap is determined according to the site temperature, and on-site assembly and installation are carried out.

[0052] This structure is suitable for setting retractable pedestrian railings at large-displacement expansion joints on long-span bridges. It is easy to construct, simple in structure, reliable in quality, and suitable for promotion.

[0053] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art based on the concepts of the present invention through logical analysis, reasoning, or limited experimentation based on the existing technology should be within the scope of protection defined by the claims.

Claims

1. A retractable bridge sidewalk railing suitable for bridge expansion joints, arranged between a main bridge (7) and an approach bridge (8), and located on both sides of the bridge pavement, wherein both sides of the main bridge (7) and the approach bridge (8) are provided with railing columns (4), characterized in that: The retractable bridge sidewalk handrail is located in the expansion joint between the main bridge (7) and the approach bridge (8), and comprises a plurality of vertical rods (1) and a retractable assembly (2), wherein adjacent vertical rods (1) are connected via the retractable assembly (2), and the upright column (4) is connected to adjacent vertical rods (1) via the retractable assembly (2); the retractable assembly (2) comprises a diamond-shaped adjusting member (20), wherein two adjacent sides of the diamond-shaped adjusting member (20) are rotatably connected, and one end of the diamond-shaped adjusting member (20) is rotatably fixed to the vertical rod (1), and the opposite end is rotatably fixed to the adjacent vertical rod (1) or the handrail upright column (4).

2. The retractable bridge sidewalk railing suitable for bridge expansion joints according to claim 1 is characterized in that: The diamond-shaped adjusting member (20) comprises a first type of diamond-shaped adjusting member and a second type of diamond-shaped adjusting member, wherein the two ends of the first type of diamond-shaped adjusting member are respectively connected to two adjacent vertical rods (1), and one end of the second type of diamond-shaped adjusting member is connected to the vertical rod (1), and the opposite end is connected to the railing column (4); the first type of diamond-shaped adjusting member and the second type of diamond-shaped adjusting member both have a diamond-shaped structure, comprising a first expansion piece (21), a second expansion piece (24), a third expansion piece (25), and a fourth expansion piece (26) which are rotatably connected in sequence head to tail.

3. The retractable bridge sidewalk railing suitable for bridge expansion joints according to claim 2 is characterized in that: The telescopic assembly (2) further comprises a pin shaft (22) and a limiting nut (23), wherein both ends of the pin shaft (22) are provided with threads, and both ends of the pin shaft (22) are respectively threadedly connected to the limiting nuts (23), and adjacent telescopic pieces of the diamond structure are rotatably connected via the pin shaft (22), and the telescopic pieces of the diamond structure are located between the limiting nuts (23).

4. The retractable bridge sidewalk railing suitable for bridge expansion joints according to claim 3 is characterized in that: The vertical rod (1) is provided with a through hole matched with the pin shaft (22); one end of the pin shaft (22) passes through the through holes of the telescopic piece and the vertical rod (1) and is then connected to a limiting nut (23).

5. The retractable bridge sidewalk railing suitable for bridge expansion joints according to claim 3 is characterized in that: The distance between adjacent vertical rods (1) is greater than or equal to the diameter of the pin (22) and less than or equal to 110 mm.

6. The retractable bridge sidewalk handrail suitable for bridge expansion joints according to claim 3, characterized in that: The pin shaft (22) is clearance-matched with the through hole of the vertical rod (1); a connecting hole is provided on the expansion piece of the diamond structure; and the pin shaft (22) is clearance-matched with the connecting hole.

7. The retractable bridge sidewalk handrail suitable for bridge expansion joints according to claim 1, characterized in that: The telescopic assembly (2) comprises a plurality of diamond-shaped adjusting members (20), and each diamond-shaped adjusting member (20) is symmetrically distributed on both sides of the vertical rod (1).

8. The retractable bridge sidewalk handrail suitable for bridge expansion joints according to claim 1, characterized in that: The two ends of the vertical rod (1) are respectively connected to the telescopic components (2); the axis of the telescopic components (2) at the upper end of each vertical rod (1) is perpendicular to the vertical rod (1); and the axis of the telescopic components (2) at the lower end of each vertical rod (1) is perpendicular to the vertical rod (1).

9. The retractable bridge sidewalk handrail suitable for bridge expansion joints according to claim 1, characterized in that: There are a plurality of railing posts (4), each of which is vertically fixed on the bridge deck. A railing handrail (3) is provided at the upper end of each railing post (4), and the railing handrail (3) is vertically connected to the railing post (4). A gap is provided between the railing handrails (3) on the main bridge (7) and the approach bridge (8).

10. The retractable bridge sidewalk handrail suitable for bridge expansion joints according to claim 9, characterized in that: A railing crossbar (5) and a railing vertical bar (6) are provided between adjacent railing columns (4) on the main bridge (7) or the approach bridge (8), the two ends of the railing vertical bar (6) are respectively vertically connected to the railing crossbar (5), and the two ends of the railing crossbar (5) are respectively vertically connected to the railing columns (4).

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