High-performance low-cost triangular truss bailey steel bridge

Abstract

This invention proposes a high-performance, low-cost triangular truss Bailey bridge, comprising an adjustable movable base, crossbeams, bridge deck, truss beams, and crash barriers. The truss beams include a first truss, a second truss, end upper chords, intermediate upper chords, and connecting blocks. Each crossbeam is internally equipped with wind-resistant tie rods and wind hooks. This Bailey bridge features a redesigned triangular truss frame; due to the difference in materials used, the strength of this triangular truss is significantly higher than that of the 200-type truss. This triangular truss Bailey bridge design can utilize standard modular components such as crossbeams, bridge decks, gap plates, wind-resistant tie rods, and wind hooks from the 200-type under-deck bridge, increasing the truss's adaptability and reducing material usage to save costs.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a high-performance, low-cost triangular truss Bailey bridge. Background Technology

[0002] Bailey bridge panels, also known as Bailey trusses, Bailey beams, or trusses, were first invented during World War II by a British engineer to address the need for rapid bridge erection during the war, and were named after him. They can be used in highway bridges, as assembly gantry cranes, guide beams, bridge erecting machines, and suspended platforms. Bailey truss combination gantry cranes utilize prefabricated highway steel bridge components to assemble the gantry frame, and their span and column height are adjustable to adapt to different work sites. They are widely used in highway, railway, municipal, building, and water conservancy construction projects, as well as in bridge construction prefabrication yards for lifting and moving prefabricated components and transporting large beams beside bridge piers.

[0003] The most widely circulated standard trusses in the market are the 321-type standard truss and the 200-row standard truss. In traditional construction methods, when using pier-beam type scaffolding for temporary supports in cast-in-place structure construction, steel sections, Bailey bridges, and military-grade beams are mostly used as the main load-bearing beams, with Bailey bridges being the most widely used. Due to the limitations of Bailey bridge structural dimensions and materials, the economical span of the main load-bearing beam as a temporary construction support is generally 12-15 m. At this span, the support structure has reasonable stress distribution, and the material usage and safety margin are moderate. Under special working conditions, when the support span exceeds 18 m, controlling the deflection of the support at this span becomes difficult, leading to the cast-in-place structure's alignment failing to meet design requirements. With the continuous improvement of transportation infrastructure, more and more bridges are being built in special environments. Taking a 30-meter span with a load of 80 tons as an example: if no pier is set in the middle of the span and a single-span temporary support is used, the Bailey beam needs to be arranged with a 200-type three-row reinforced structure to meet the construction requirements, and the number of high-shear Bailey panels at the beginning and end of the Bailey truss needs to be replaced by high-shear Bailey panels, which is generally 1 / 3 of the total number of sections. Even so, the temporary support has problems such as large material consumption and large deflection. Utility Model Content

[0004] The purpose of this invention is to provide a high-performance, low-cost triangular truss Bailey bridge. Its structure is simple and rational, and the redesigned triangular truss Bailey frame, due to the difference in materials used, results in a significantly higher strength than the 200-type truss. This triangular truss Bailey bridge design is compatible with standard modular components such as crossbeams, bridge decks, gap plates, wind-resistant tie rods, and wind hooks from the 200-type under-deck bridge, increasing the truss's adaptability and reducing material usage to save costs.

[0005] The purpose of this utility model is achieved as follows:

[0006] A high-performance, low-cost triangular truss Bailey bridge is provided. The Bailey bridge is horizontally installed on both sides of the piers. The Bailey bridge includes adjustable movable bases, crossbeams, bridge decks, truss beams, and crash barriers. There are two sets of adjustable movable bases, which are respectively installed on the pier surfaces of the two side piers. The adjustable movable bases support the entire Bailey bridge. The truss beams are detachably mounted on each adjustable movable base. The crossbeams are located at the lower end of the truss beams. The bridge decks are located directly above the crossbeams. The crash barriers are located on the left and right sides of the bridge decks and above the crossbeams. The lower ends of the crash barriers are close to the truss beams.

[0007] The truss beam includes a first truss, a second truss, an end upper chord, a middle upper chord, and a connecting block. The first truss has a right-angled triangular structure on its front, and the second truss has an isosceles triangular structure on its front. The second truss is composed of two inwardly facing vertical sections of the first truss. The second trusses are arranged horizontally at equal intervals from left to right. The first trusses are arranged on both sides of the second truss, and the inward side is fixedly connected to the second truss. The lower ends of the first and second trusses are fixed by bolts and nuts. The end upper chord is arranged between the first and second trusses. The middle upper chord is arranged between two adjacent second trusses. The connecting block is arranged at the upper end of the first and second trusses. The connecting block has threaded holes for connection. The end upper chord and the middle upper chord are connected to the first and second trusses by bolts and nuts through the connecting block and the threaded rod.

[0008] Furthermore, there are multiple crossbeams, which are vertically installed at the ends of the vertical sections of the first truss and the second truss. The front of the crossbeam is inverted U-shaped, the left side of the crossbeam is convex, the upper surface of the crossbeam is rectangular, and the right side of the crossbeam is provided with threaded holes for easy fixed connection with the truss beam. The crossbeam is fixed to the lower end of the truss beam through the threaded holes and bolts and nuts.

[0009] Furthermore, each crossbeam is equipped with a wind-resistant tie rod and a wind hook. The wind-resistant tie rod is horizontally arranged, with one end fixedly connected to the lower part of the crossbeam and the other end fixedly connected to the vertical parts of the first and second trusses. There are two sets of wind hooks, which are inclined from top to bottom between the crossbeam and the vertical parts of the first and second trusses. One end of the wind hook is fixedly connected to the crossbeam and the other end is fixedly connected to the vertical parts of the first and second trusses. The two sets of wind hooks form an X shape.

[0010] Furthermore, the bottom of the truss beam is provided with a fixing block for convenient and adjustable movable base positioning and fixed connection. The fixing block is provided with a positioning and fixing groove, which is arc-shaped. The adjustable movable base is provided with a positioning and fixing block that cooperates with the positioning and fixing groove. The truss beam is fixedly connected to the adjustable movable base through the positioning and fixing groove and the positioning and fixing block.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This Bailey bridge features a redesigned triangular truss Bailey frame. Due to the difference in materials used in its construction, the strength of this triangular truss is significantly higher than that of the Type 200 truss. This triangular truss Bailey bridge design is compatible with standard modular components such as crossbeams, bridge decks, gap plates, wind-resistant tie rods, and wind hooks from the Type 200 under-deck bridge, increasing the truss's adaptability and reducing material usage to save costs. Attached Figure Description

[0013] Figure 1 This is a working diagram of the Bailey Bridge.

[0014] Figure 2 This is a left view of the Bailey Bridge.

[0015] Figure 3 This is a diagram of the first and second trusses.

[0016] Figure 4 This is a structural diagram of the adjustable movable base.

[0017] Among them, 1 is an adjustable movable base, 11 is a limiting and fixing block, 2 is a crossbeam, 3 is a bridge deck, 4 is a truss beam, 41 is the first truss, 42 is the second truss, 43 is the end upper chord, 44 is the middle upper chord, 45 is a connecting block, 46 is a fixing block, 461 is a limiting and fixing groove, 5 is a crash barrier, 6 is a bridge pier, 7 is a wind-resistant tie rod, and 8 is a wind hook. Detailed Implementation

[0018] like Figure 1-4 As shown, a high-performance, low-cost triangular truss Bailey bridge is horizontally installed on both sides of pier 6. The Bailey bridge includes adjustable movable bases 1, crossbeams 2, bridge deck 3, truss beams 4, and crash barriers 5. There are two sets of adjustable movable bases 1, which are respectively installed on the surface of the piers 6 on both sides. The adjustable movable bases 1 are used to support the entire Bailey bridge. The truss beams 4 are detachably mounted on each adjustable movable base 1. The crossbeams 2 are located at the lower end of the truss beams 4. The bridge deck 3 is located directly above the crossbeams 2. The crash barriers 5 are located on the left and right sides of the bridge deck 3 and above the crossbeams 2. The lower end of the crash barriers 5 is close to the truss beams 4.

[0019] The truss beam 4 includes a first truss 41, a second truss 42, an end upper chord 43, a middle upper chord 44, and a connecting block 45. The first truss 41 has a right-angled triangular structure on its front, and the second truss 42 has an isosceles triangular structure on its front. The second truss 42 is composed of the inward-facing vertical portions of two first trusses 41. The second trusses 42 are horizontally arranged at equal intervals from left to right. The first trusses 41 are located on both sides of the second truss 42, and their inward-facing sides are fixedly connected to the second trusses 42. The lower ends of the first truss 41 and the second truss 42 are fixed by bolts and nuts. The upper chord 43 at the end is located between the first truss 41 and the second truss 42. The middle upper chord 44 is located between two adjacent second trusses 42. The connecting block 45 is located at the upper end of the first truss 41 and the second truss 42. The connecting block 45 is provided with a threaded hole for connection. The upper chord 43 at the end and the middle upper chord 44 are connected to the first truss 41 and the second truss 42 by bolts and nuts through the connecting block 45 and the threaded rod.

[0020] Furthermore, there are multiple crossbeams 2, which are vertically arranged at the ends of the vertical sections of the first truss 41 and the second truss 42. The front of the crossbeam 2 is inverted U-shaped, the left side of the crossbeam 2 is convex, the upper surface of the crossbeam 2 is rectangular, and the right side of the crossbeam 2 is provided with threaded holes for easy fixed connection with the truss beam 4. The crossbeam 2 is fixedly installed at the lower end of the truss beam 4 through the threaded holes and bolts and nuts.

[0021] Furthermore, each crossbeam 2 is equipped with a wind-resistant tie rod 7 and a wind hook 8 inside. The wind-resistant tie rod 7 is horizontally arranged, with one end fixedly connected to the lower part of the crossbeam 2 and the other end fixedly connected to the vertical part of the first truss 41 and the second truss 42. There are two sets of wind hooks 8, which are inclined from top to bottom between the crossbeam 2 and the vertical part of the first truss 41 and the second truss 42. One end of the wind hook 8 is fixedly connected to the crossbeam 2, and the other end is fixedly connected to the vertical part of the first truss 41 and the second truss 42. The two sets of wind hooks 8 form an X shape.

[0022] Furthermore, the bottom of the truss beam 4 is provided with a fixing block 46 for convenient and fixed connection with the adjustable movable base 1. The fixing block 46 is provided with a limiting fixing groove 461, which is arc-shaped. The adjustable movable base 1 is provided with a limiting fixing block 11 that cooperates with the limiting fixing groove 461. The truss beam 4 is fixedly connected to the adjustable movable base 1 through the limiting fixing groove 461 and the limiting fixing block 11.

[0023] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A high performance low cost triangular truss Bailey steel bridge characterized in that: The Bailey bridge is horizontally installed on both sides of the pier (6). The Bailey bridge includes adjustable movable bases (1), crossbeams (2), bridge deck (3), truss beams (4) and crash barriers (5). There are two sets of adjustable movable bases (1), which are installed on the pier (6) surfaces of the two piers (6) respectively. The adjustable movable bases (1) are used to support the entire Bailey bridge. The truss beams (4) are detachably installed on each adjustable movable base (1). The crossbeams (2) are installed at the lower end of the truss beams (4). The bridge deck (3) is installed directly above the crossbeams (2). The crash barriers (5) are installed on the left and right sides of the bridge deck (3) and above the crossbeams (2). The lower end of the crash barriers (5) is close to the truss beams (4). The truss beam (4) includes a first truss (41), a second truss (42), an end upper chord (43), a middle upper chord (44), and a connecting block (45). The first truss (41) has a right-angled triangular structure on the front, and the second truss (42) has an isosceles triangular structure on the front. The second truss (42) is composed of the vertical parts of two first trusses (41) facing inward. The second trusses (42) are arranged horizontally at equal intervals from left to right. The first trusses (41) are arranged on both sides of the second truss (42), and the inward side is fixedly connected to the second truss (42). 1) The lower end of the second truss (42) is fixed by bolts and nuts. The upper chord (43) at the end is located between the first truss (41) and the second truss (42). The middle upper chord (44) is located between two adjacent second trusses (42). The connecting block (45) is located at the upper end of the first truss (41) and the second truss (42). The connecting block (45) is provided with a threaded hole for connection. The upper chord (43) at the end and the middle upper chord (44) are connected to the first truss (41) and the second truss (42) by bolts and nuts through the connecting block (45) and the threaded rod.

2. A high performance low cost triangulated truss Bailey steel bridge as claimed in claim 1, wherein: There are multiple crossbeams (2), and the multiple crossbeams (2) are vertically set at the ends of the vertical parts of the first truss (41) and the second truss (42). The front of the crossbeam (2) is inverted U-shaped, the left side of the crossbeam (2) is convex, the upper surface of the crossbeam (2) is rectangular, and the right side of the crossbeam (2) is provided with threaded holes for easy fixed connection with the truss beam (4). The crossbeam (2) is fixed at the lower end of the truss beam (4) through the threaded holes and bolts and nuts.

3. A high performance low cost triangulated truss Bailey steel bridge as claimed in claim 1, wherein: Each crossbeam (2) is equipped with a wind-resistant tie rod (7) and a wind hook (8). The wind-resistant tie rod (7) is horizontally arranged. One end of the wind-resistant tie rod (7) is fixedly connected to the lower part of the crossbeam (2), and the other end is fixedly connected to the vertical part of the first truss (41) and the second truss (42). There are two sets of wind hooks (8). The two sets of wind hooks (8) are inclined from top to bottom between the crossbeam (2) and the vertical part of the first truss (41) and the second truss (42). One end of the wind hook (8) is fixedly connected to the crossbeam (2), and the other end is fixedly connected to the vertical part of the first truss (41) and the second truss (42). The two sets of wind hooks (8) form an X shape.

4. A high performance low cost triangulated truss Bailey steel bridge as claimed in claim 1, wherein: The bottom of the truss beam (4) is provided with a fixing block (46) for convenient and adjustable movable base (1) for limiting and fixing connection. The fixing block (46) is provided with a limiting fixing groove (461) which is arc-shaped. The adjustable movable base (1) is provided with a limiting fixing block (11) that cooperates with the limiting fixing groove (461). The truss beam (4) is fixedly connected to the adjustable movable base (1) through the limiting fixing groove (461) and the limiting fixing block (11).

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