Prefabricated and assembled steel arch bridge and construction method thereof

Abstract

The application provides a prefabricated assembled steel arch bridge and a construction method thereof, and relates to the technical field of arch bridges.The prefabricated assembled steel arch bridge comprises a bridge deck component and at least one main arch component, and further comprises a positioning support arch component, wherein the positioning support arch component comprises an arch-shaped positioning support frame and a base arranged at the bottom of both ends of the positioning support frame, the main arch component is embedded in a main arch component embedding cavity of the positioning support frame, both ends of the main arch component are respectively inserted into an insertion slot of the base at both ends of the positioning support frame, and the main arch component is fixed on the positioning support arch component, the bridge deck component is fixed above a bridge deck support frame of the main arch component by cooperation of a positioning sleeve and a positioning column, and the bridge deck component is supported by the bridge deck support frame.The application improves the construction efficiency of the assembled arch bridge and reduces the construction cost.

Description

Technical Field

[0001] This invention relates to the field of arch bridge technology, specifically a prefabricated assembled steel arch bridge and its construction method. Background Technology

[0002] An arch bridge is a bridge in which the arch serves as the main load-bearing structural member in a vertical plane. Among various bridge structural systems, arch bridges have unique stress characteristics. With the arch as the main load-bearing member of the superstructure in a vertical plane, the bridge body itself experiences relatively small bending moments. Furthermore, the arch ring (arch frame) can be fixed to the rocks in the valley, making it a relatively economical and reasonable bridge structural form in deep valley areas.

[0003] Among the existing references, patent publication number CN104499413A discloses a modular steel-formed concrete composite arch bridge and its suspension construction method in the field of bridge construction technology. The invention includes: a composite arch ring with cast-in-place concrete and vertical columns, bridge deck beams, and bridge panel components mounted thereon. The modular composite arch ring is composed of one or more assembled steel arches, each of which includes several modular steel formwork units fixedly connected in the arc length direction. These steel formwork units can be modularly produced in a factory, resulting in low manufacturing costs and convenient transportation. This invention exhibits good overall performance; the steel formwork units eliminate the need for extensive use of formwork during traditional concrete pouring and do not require dismantling after completion. It can meet the requirements of composite arches with large spans and high construction rigidity, and can cope with different span, rigidity, and construction stability requirements. This type of arch bridge structure is particularly suitable for the construction of arch bridges with large arch heights, i.e., large inner diameters of the arch rings. However, for some arch bridges with small arch heights and many arch rings, if the above structure is used, the installation position of each section needs to be measured during the assembly of the arch bridge to achieve the fixed installation of each section. The installation workload of the arch bridge is extremely large, and the construction efficiency is low. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a prefabricated assembled steel arch bridge and its construction method, so as to solve the problems of large amount of arch bridge assembly work and low construction efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problem is: a prefabricated assembled steel arch bridge, including a bridge deck component and at least one main arch frame component. The main arch frame component is provided with a bridge deck support frame for supporting the bridge deck component, and also includes a positioning support arch frame component. The positioning support arch frame component includes an arched positioning support frame and a base set at the bottom of both ends of the positioning support frame. The middle part of the positioning support frame is provided with a cavity to form an embedding cavity for the main arch frame component. Vertical positioning columns are provided on both sides of the positioning support frame. The base is provided with an insertion groove for fixing the main arch frame component. Positioning sleeves that slide with the positioning columns are provided on both sides of the bridge deck component.

[0006] The main arch frame component is embedded in the main arch frame component of the positioning support frame, and its two ends are respectively inserted into the insertion slots of the bases at both ends of the positioning support frame, thereby fixing it on the positioning support arch frame component. The bridge deck component is fixed above the bridge deck support frame of the main arch frame component by cooperating with the positioning sleeve and the positioning column, and is supported by the bridge deck support frame.

[0007] Furthermore, the bridge deck support frame is welded to the bridge deck components.

[0008] Furthermore, a reinforcing component is provided on the inner side of the main arch frame component.

[0009] Furthermore, the reinforcing component includes a first arc-shaped plate, a second arc-shaped plate, and an A-shaped reinforcing member. The first arc-shaped plate is arranged with the same arc-shaped orientation as the main arch frame component. The two ends of the first arc-shaped plate are respectively connected to the two ends of the main arch frame component. The second arc-shaped plate is disposed opposite to the top surface of the first arc-shaped plate, and its two ends are respectively connected to the main arch frame component. The reinforcing member is disposed on the inner side of the first arc-shaped plate, and its two legs are respectively connected to the two ends of the first arc-shaped plate. The top of the reinforcing member is connected to the top of the main arch frame component.

[0010] Furthermore, there are multiple main arch frame components, which are arranged sequentially along the length of the bridge deck component. A positioning support frame connecting component is provided between the positioning support frames of two adjacent main arch frame components to connect the two adjacent positioning support frames into a whole.

[0011] Furthermore, the positioning support frame connecting component includes a first connecting rod, and a second connecting rod and a third connecting rod that are inclined above the first connecting rod relative to the vertical direction; the lower ends of the second connecting rod and the third connecting rod are respectively connected to the two ends of the first connecting rod, and the second connecting rod and the third connecting rod are inclined towards each other in the direction of their upper ends;

[0012] The two ends of the first connecting rod are respectively connected to the adjacent positioning support frame, and the upper ends of the second and third connecting rods are respectively connected to the bridge deck component to support the bridge deck component.

[0013] Furthermore, the first connecting rod has a U-shaped structure, and the second and third connecting rods are both located inside the first connecting rod. The outer sides of both ends of the first connecting rod are provided with arc-shaped surfaces that fit against the outer surfaces of the corresponding positioning support frames. The two ends of the first connecting rod are respectively connected to the adjacent positioning support frames through the corresponding arc-shaped surfaces.

[0014] Furthermore, the upper end of the positioning post is provided with a post tip.

[0015] The above-mentioned construction method for a prefabricated steel arch bridge includes the following steps:

[0016] Prefabricate the bridge deck components, main arch frame components, and positioning support arch frame components according to the design dimensions;

[0017] Install the positioning support arch component to the installation position of the main arch component, and fix the base of the positioning support arch component;

[0018] The main arch frame component is embedded in the main arch frame component embedding cavity, and its two ends are respectively inserted into the corresponding insertion slots;

[0019] The bridge deck component is hoisted above the positioning support arch component, and then the bridge deck component is lowered so that the positioning column is inserted into the positioning sleeve of the bridge deck component until the lower end face of the bridge deck component contacts the bridge deck support frame and is supported by the bridge deck support frame.

[0020] Furthermore, it also includes the step of welding the bridge deck support frame to the bridge deck components and the main arch frame components to the positioning support frame.

[0021] The beneficial effects of this invention are as follows: The prefabricated assembled steel arch bridge of this invention divides the arch bridge into several parts, including a bridge deck component, a main arch frame component, and a positioning support frame. The main arch frame component is embedded in the main arch frame component's embedding cavity of the positioning support frame, and its two ends are respectively inserted into the insertion slots of the bases at both ends of the positioning support frame, thereby fixing it to the positioning support arch frame component. The bridge deck component is fixed above the bridge deck support frame of the main arch frame component through a positioning sleeve and a positioning column, and is supported by the bridge deck support frame, thereby assembling to form the prefabricated assembled steel arch bridge of this invention. The main arch frame component is fixed and limited by the positioning support frame and the base, resulting in good stability of the main arch frame component, convenient positioning and installation of the bridge deck, fewer assembled parts, simple assembly structure, and convenient installation, reducing the amount of construction work, improving the construction efficiency of the assembled arch bridge, and reducing construction costs. Attached Figure Description

[0022] Figure 1 This is a perspective view of the prefabricated assembled steel arch bridge of the present invention;

[0023] Figure 2 This is a structural schematic diagram of the prefabricated assembled steel arch bridge of the present invention;

[0024] Figure 3 yes Figure 1 Enlarged view of point A;

[0025] Figure 4 This is a structural diagram of the reinforced component;

[0026] Figure 5 This is a structural diagram of the connecting components;

[0027] The figure shows: bridge deck component 1, main arch frame component 2, reinforcing component 4, positioning support arch frame component 3, bridge deck support frame 21, positioning support frame 31, base 32, positioning column 33, main arch frame component embedding cavity 34, insertion groove 321, positioning sleeve 11, first arc plate 41, second arc plate 42, reinforcing component 43, first connecting rod 51, second connecting rod 52, third connecting rod 53, reinforcing rod 54, and arc surface 511. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] like Figures 1 to 3 As shown, a prefabricated assembled steel arch bridge of the present invention includes a bridge deck component 1 and at least one main arch frame component 2. A bridge deck support frame 21 for supporting the bridge deck component 1 is welded onto the main arch frame component 2. The bridge deck component 2 also includes a positioning support arch frame component 3. The positioning support arch frame component 3 includes an arched positioning support frame 31 and bases 32 disposed at the bottom of both ends of the positioning support frame 31. A cavity is provided in the middle of the positioning support frame 31 to form a main arch frame component embedding cavity 34. Vertical positioning posts 33 are respectively provided on both sides of the positioning support frame 31. An insertion groove 321 for fixing the main arch frame component 2 is provided on the base 32. Positioning sleeves 11 that slide in cooperation with the positioning posts 33 are respectively provided on both sides of the bridge deck component 1. The main arch frame component 2 is embedded in the main arch frame component embedding cavity 34 of the positioning support frame 31, and its two ends are respectively inserted into the insertion slots 321 of the bases 32 at both ends of the positioning support frame 31, thereby fixing it on the positioning support arch frame component 3. The bridge deck component 1 is fixed above the bridge deck support frame 21 of the main arch frame component 2 through the positioning sleeve 11 and the positioning column 33, and is supported by the bridge deck support frame 21, thereby assembling to form the prefabricated assembled steel arch bridge of the present invention.

[0030] To facilitate the assembly of the positioning sleeve 11 and the positioning post 33, the upper end of the positioning post 33 is provided with a post tip.

[0031] It is understandable that the bridge deck component 1 can be selected as an integral structure or a spliced ​​structure composed of multiple segments, depending on the length of the arch bridge; the specific number of positioning columns 33 on both sides of the positioning support frame 31 can be one or more, set as needed, to ensure the positioning of the bridge deck component.

[0032] The construction method of the prefabricated assembled steel arch bridge of the present invention is as follows:

[0033] Step 1: Prefabricate the bridge deck component 1, main arch frame component 2, and positioning support arch frame component 3 according to the design dimensions;

[0034] Step 2: Install the positioning support arch frame component 3 to the installation position of the main arch frame component 2, and fix the base 32 of the positioning support arch frame component 3;

[0035] Step 3: Install the main arch frame component 2 into the main arch frame component mounting cavity 34, and insert its two ends into the corresponding insertion slots 321 respectively;

[0036] Step 4: Hoist the bridge deck component 1 above the positioning support arch component 3, and then lower the bridge deck component 1 so that the positioning column 33 is inserted into the positioning sleeve 11 of the bridge deck component 1 until the lower end face of the bridge deck component 1 contacts the bridge deck support frame 21 and is supported by the bridge deck support frame 21.

[0037] The base 32 of the fixed positioning support arch component 3 can be fixed in the foundation concrete by pouring concrete on the foundation.

[0038] After assembly, optionally, the bridge deck support frame 21 can be welded together with the bridge deck component 1 and the main arch frame component 2 with the positioning support frame 31 to further ensure the stability of the arch bridge.

[0039] The prefabricated assembled steel arch bridge of the present invention comprises several parts: a bridge deck component 1, a main arch frame component 2, and a positioning support frame 31. The main arch frame component 2 is fixed to the positioning support arch frame component 31 by being embedded in the main arch frame component embedding cavity 34 of the positioning support frame 31, with both ends respectively inserted into the insertion slots 321 of the bases 32 at both ends of the positioning support frame 31. The bridge deck component 1 is fixed above the bridge deck support frame 21 of the main arch frame component 2 by the cooperation of the positioning sleeve 11 and the positioning column 33, and is supported by the bridge deck support frame 21, thereby assembling to form the prefabricated assembled steel arch bridge of the present invention. The main arch frame component 2 is fixed and limited by the positioning support frame 31 and the bases 32. The main arch frame component 2 has good stability, fewer assembled parts, simple assembly structure, and convenient installation, reducing the amount of construction work, improving the construction efficiency of the assembled arch bridge, and reducing construction costs. This type of arch bridge structure is particularly suitable for the construction of arch bridges with relatively low arch height, i.e., relatively small inner diameter of the main arch frame component 2.

[0040] To facilitate the insertion of the main arch frame component 2 into the insertion slot 321, the inner wall of the insertion slot 321 can be polished. To facilitate the installation of the main arch frame component 2 into the main arch frame component mounting cavity 34, the side of the positioning support frame 31 opposite to the main arch frame component 2 can be rounded and polished.

[0041] In this invention, the main arch frame component 2 and the positioning support arch frame component can be made of various profiles.

[0042] In this embodiment of the invention, the main arch frame component 2 is provided with plug-in seats 22 at both ends, and the main arch frame component 2 is plugged into the plug-in slot 321 through the plug-in seats 22.

[0043] In the above-described assembly structure, since the main arch frame component is fixed primarily through the insertion slot 321, and the two ends of the main arch frame component move mainly in directions away from each other after being subjected to force, the lateral force on the insertion slot 321 is relatively large, which is relatively detrimental to ensuring the stability of the arch frame component. Therefore, a reinforcing component 4 is further provided on the inner side of the main arch frame component 2 to improve its rigidity and stability. The reinforcing component 4 can be of various structures, such as a connecting rod disposed between the two ends of the main arch frame component 2.

[0044] like Figure 2 , Figure 4 As shown, in the present invention, the reinforcing component preferably includes a first arc-shaped plate 41, a second arc-shaped plate 42, and an A-shaped reinforcing member 43. The first arc-shaped plate 41 is arranged with the same arc orientation as the main arch frame component 2. The two ends of the first arc-shaped plate 41 are respectively connected to the two ends of the main arch frame component 2, that is, they are arranged between the two ends of the main arch frame component 2. The second arc-shaped plate 42 is arranged opposite to the top surface of the first arc-shaped plate 41, and its two ends are respectively connected to the main arch frame component 2. The reinforcing member 43 is arranged inside the first arc-shaped plate 41, and its two legs are respectively connected to the two ends of the first arc-shaped plate 41. The top of the reinforcing member 43 is connected to the top of the main arch frame component 2. The reinforcing components of this structure form a top-to-bottom (from top to both ends) reinforcing structure for the main arch frame component 2 through the first arc plate 41, the second arc plate 42, and the A-shaped reinforcing member 43. The main arch frame component 2 is subjected to more uniform force. The first arc plate 41, the second arc plate 42, and the A-shaped reinforcing member 43 cooperate with each other to significantly improve the rigidity of the main arch frame component 2, making it less prone to deformation when under pressure. The force exerted by the main arch frame component 2 on the insertion groove 321 is mainly downward. Since the base 32 is fixed on the foundation, the base 32 is not prone to displacement or deformation, which is beneficial to the fixation of the main arch frame component 2 and also facilitates the use of the arch bridge assembly structure of the present invention.

[0045] When there are multiple main arch frame components 2, it is understood that the main arch frame components 2 are arranged sequentially along the length direction of the bridge deck component 1. Corresponding to the main arch frame components 2, there should also be multiple positioning support frames. In order to further ensure the stability of the arch bridge, a positioning support frame connecting component 5 is provided between the positioning support frames 31 of two adjacent main arch frame components 2 to connect the two adjacent positioning support frames 31 into a whole. The positioning support frame connecting component 5 can be one or more connecting rods.

[0046] Figure 5As shown, specifically, the positioning support frame connecting component 5 includes a first connecting rod 51, and a second connecting rod 52 and a third connecting rod 53 inclined above the first connecting rod 51 relative to the vertical direction; the lower ends of the second connecting rod 52 and the third connecting rod 53 are respectively connected to the two ends of the first connecting rod 51, and the second connecting rod 52 and the third connecting rod 53 are inclined towards each other at their upper ends. During installation, as... Figure 2 As shown, the two ends of the first connecting rod 51 are respectively connected to the adjacent positioning support frame 31, and the upper ends of the second connecting rod 52 and the third connecting rod 53 are respectively connected to the bridge deck component 1 to support the bridge deck component 1. The connections described above can be made using conventional methods such as welding or bolting.

[0047] The above structure can not only connect the positioning support frames 31 into a whole, but also convert the weight of the bridge deck components borne by the second connecting rod 52 and the third connecting rod 53 into a force that resists the expansion and deformation of the positioning support frames 31 to both ends, which is more conducive to ensuring the stability of the arch bridge with the above structure.

[0048] The first connecting rod 51 can be a straight rod, and it can be connected to the corresponding positioning support frame 31 through its end face. Preferably, in this invention, the first connecting rod 51 has a U-shaped structure. The second connecting rod 52 and the third connecting rod 53 are both located inside the first connecting rod 51 (on one side of the U-shaped opening of the first connecting rod). The outer ends of both ends of the first connecting rod 51 are provided with arc-shaped surfaces 511 that fit against the outer surfaces of the corresponding positioning support frame 31. The two ends of the first connecting rod 51 are respectively connected to the adjacent positioning support frame 31 through the corresponding arc-shaped surfaces 511. This structure is more conducive to converting the weight of the bridge deck component borne by the second connecting rod 52 and the third connecting rod 53 into a force that resists the outward expansion and deformation of the positioning support frame 31, thus improving the stress distribution on the positioning support frame 31. Reinforcing rods 54 can be provided between the second connecting rod 52 and the third connecting rod 53 as needed.

[0049] After the arch bridge of the present invention is equipped with the above-mentioned positioning support frame connecting component 5 and reinforcing component 4, the various structures cooperate with each other, the arch bridge not only has fewer assembly parts and is easy to install, but also can better improve the high stability of the arch bridge during use.

Claims

1. A prefabricated assembled steel arch bridge, comprising a bridge deck component (1) and at least one main arch frame component (2), wherein the main arch frame component (2) is provided with a bridge deck support frame (21) for supporting the bridge deck component (1), characterized in that, It also includes a positioning support arch frame component (3), which includes an arched positioning support frame (31) and a base (32) set at the bottom of both ends of the positioning support frame (31). The positioning support frame (31) has a cavity in the middle to form a main arch frame component embedding cavity (34). Vertical positioning columns (33) are respectively provided on both sides of the positioning support frame (31). The base (32) is provided with a plug groove (321) for fixing the main arch frame component (2). Positioning sleeves (11) that slide with the positioning columns (33) are respectively provided on both sides of the bridge deck component (1). The main arch frame component (2) is embedded in the main arch frame component embedding cavity (34) of the positioning support frame (31), and its two ends are respectively inserted into the insertion slots (321) of the bases (32) at both ends of the positioning support frame (31), thereby fixing it on the positioning support arch frame component (3). The bridge deck component (1) is fixed above the bridge deck support frame (21) of the main arch frame component (2) by cooperating with the positioning column (33) through the positioning sleeve (11), and is supported by the bridge deck support frame (21).

2. The prefabricated assembled steel arch bridge as described in claim 1, characterized in that, The bridge deck support frame (21) is welded to the bridge deck component (1).

3. A prefabricated assembled steel arch bridge as described in claim 1, characterized in that, The main arch frame component (2) is provided with a reinforcing component (4) on its inner side.

4. A prefabricated assembled steel arch bridge as described in claim 3, characterized in that, The reinforcing component (4) includes a first arc plate (41), a second arc plate (42), and an A-shaped reinforcing member (43). The first arc plate (41) is arranged with the same arc orientation as the main arch frame component (2). The two ends of the first arc plate (41) are respectively connected to the two ends of the main arch frame component (2). The second arc plate (42) is arranged on the top surface of the first arc plate (41) with its back facing away from it, and its two ends are respectively connected to the main arch frame component (2). The reinforcing member (43) is arranged on the inner side of the first arc plate (41), and its two legs are respectively connected to the two ends of the first arc plate (41). The top of the reinforcing member (43) is connected to the top of the main arch frame component (2).

5. A prefabricated assembled steel arch bridge as described in claim 1, 2, 3, or 4, characterized in that, There are multiple main arch frame components (2), which are arranged sequentially along the length direction of the bridge deck component (1). A positioning support frame connecting component (5) is provided between the positioning support frames (31) of two adjacent main arch frame components (2) to connect the two adjacent positioning support frames (31) into a whole.

6. A prefabricated assembled steel arch bridge as described in claim 5, characterized in that, The positioning support frame connecting component (5) includes a first connecting rod (51), and a second connecting rod (52) and a third connecting rod (53) that are inclined above the first connecting rod (51) relative to the vertical direction; the lower ends of the second connecting rod (52) and the third connecting rod (53) are respectively connected to the two ends of the first connecting rod (51), and the second connecting rod (52) and the third connecting rod (53) are inclined towards each other at their upper ends; The two ends of the first connecting rod (51) are respectively connected to the adjacent positioning support frame (31), and the upper ends of the second connecting rod (52) and the third connecting rod (53) are respectively connected to the bridge deck component (1) to support the bridge deck component (1).

7. A prefabricated assembled steel arch bridge as described in claim 6, characterized in that, The first connecting rod (51) has a U-shaped structure. The second connecting rod (52) and the third connecting rod (53) are both located inside the first connecting rod (51). The outer sides of both ends of the first connecting rod (51) are provided with arc-shaped surfaces (511) that fit against the outer side of the corresponding positioning support frame (31). The two ends of the first connecting rod (51) are respectively connected to the adjacent positioning support frame (31) through the corresponding arc-shaped surfaces (511).

8. A prefabricated assembled steel arch bridge as described in claim 1, characterized in that, The upper end of the positioning post (33) is provided with a post tip.

9. A construction method for a prefabricated assembled steel arch bridge as described in any one of claims 1 to 8, characterized in that, Includes the following steps: The bridge deck components (1), main arch frame components (2), and positioning support arch frame components (3) are prefabricated according to the design dimensions. Install the positioning support arch frame component (3) to the installation position of the main arch frame component (2) and fix the base (32) of the positioning support arch frame component (3); The main arch frame component (2) is installed in the main arch frame component mounting cavity (34), and its two ends are respectively inserted into the corresponding insertion slots (321); The bridge deck component (1) is hoisted above the positioning support arch component (3), and then the bridge deck component (1) is lowered so that the positioning column (33) is inserted into the positioning sleeve (11) of the bridge deck component (1) until the lower end face of the bridge deck component (1) contacts the bridge deck support frame (21) and is supported by the bridge deck support frame (21).

10. The construction method of the prefabricated assembled steel arch bridge as described in claim 9, characterized in that, It also includes the step of welding the bridge deck support frame (21) to the bridge deck component (1) and the main arch component (2) to the positioning support frame (31).

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