Prefabricated combined plate steel web member arch bridge structure and construction method

Abstract

This invention provides a prefabricated composite steel truss web arch bridge structure and construction method, relating to the field of bridge technology. It includes a fixing plate, comprising a first fixing plate and a second fixing plate. The first fixing plate includes a precast slab, a first steel pipe, a second steel pipe, and longitudinal reinforcing bars. The first and second steel pipes are respectively arranged longitudinally within protrusions on both sides of the precast slab. Web members are also included, with one end connected to the first fixing plate via a node plate, and the other end connected to the second fixing plate via a node plate. This invention utilizes a precast steel-concrete composite slab structure for the fixing plate and steel truss web members. The fixing plate is prefabricated in a factory. Depending on transportation conditions, it can be pre-assembled in the factory or transported to an assembly yard for assembly. The assembled arch rib segments are then transported to the bridge site for assembly and installation. Finally, only the wet joints between the segments need to be poured, and concrete is injected into the steel pipes to form the arch ribs, thus simplifying and maximizing the bridge construction process.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and more specifically, to prefabricated composite slab steel truss arch bridges and their construction methods. Background Technology

[0002] Currently, when railway arch bridges have large spans, they are usually constructed using reinforced concrete arch bridges with stiffened frames. These bridges typically use steel pipes or trusses to first form a steel arch rib structure, which then serves as the stiffening frame. Reinforced concrete is then used to encase the arch ribs, forming a reinforced concrete arch. Because these bridges use more concrete to bear the load, they require less steel and are more economical. However, they have the disadvantage of complex construction, especially in the process of encasing the frame in concrete. This involves using the stiffened frame to erect formwork segment by segment, tying reinforcing bars, and then pouring concrete. The process is complex, and the concrete encasing work is done at heights on-site after the arch ribs are formed, posing high safety risks and difficulties in quality control. Summary of the Invention

[0003] The purpose of this invention is to provide a prefabricated composite slab steel truss web arch bridge structure and construction method to improve the above-mentioned problems. To achieve the above objective, the technical solution adopted by this invention is as follows:

[0004] In a first aspect, this application provides a prefabricated composite slab steel truss arch bridge structure, comprising:

[0005] A fixing plate, comprising a first fixing plate and a second fixing plate, wherein the first fixing plate and the second fixing plate are configured identically, the first fixing plate comprising a precast slab, a first steel pipe, a second steel pipe and longitudinal reinforcing bars, the precast slab having a dumbbell-shaped cross-section and being a hollow cavity, the first steel pipe and the second steel pipe being hollow cylinders, the longitudinal reinforcing bars being arranged along the inner wall of the precast slab, the first steel pipe and the second steel pipe being respectively arranged longitudinally within the protrusions on both sides of the precast slab, and the fixing plate being provided with a node plate;

[0006] The web member has one end connected to the first fixing plate via the node plate and the other end connected to the second fixing plate via the node plate, thereby fixing the first fixing plate and the second fixing plate together.

[0007] Furthermore, the length of the longitudinal reinforcing bar is greater than the longitudinal length of the precast slab, the length of the first steel pipe is greater than the length of the longitudinal reinforcing bar, and the second steel pipe is configured in the same way as the first steel pipe.

[0008] Furthermore, the difference between the length of the longitudinal reinforcement and the longitudinal length of the precast slab is within a first set threshold, the difference between the length of the first steel pipe and the length of the longitudinal reinforcement is within a second set threshold, and the second steel pipe is configured the same as the first steel pipe.

[0009] Furthermore, the node plate is fixedly connected to the first steel pipe and the second steel pipe, and two node plates are respectively provided on the first steel pipe and the second steel pipe, and two web members can be provided on the node plate.

[0010] Furthermore, the web member, the first fixing plate, and the second fixing plate constitute an arch rib segment, and multiple arch rib segments are fixedly connected to each other.

[0011] Furthermore, the distance between the inner wall of the precast slab and the outer surfaces of the first and second steel pipes is not less than a set threshold.

[0012] Furthermore, the node plate is a hot-rolled double-sided composite stainless steel structure.

[0013] Furthermore, the web member is an H-shaped steel structure.

[0014] Furthermore, the web member is fixed to the node plate by bolts or welding.

[0015] Secondly, this application also provides a construction method for a prefabricated composite slab steel truss arch bridge, including:

[0016] The arch rib segments are spliced ​​one by one starting from the arch feet on both sides, and the outward steel pipe joints of adjacent arch rib segments are aligned and welded and fixed. The arch rib segment is composed of a fixing plate and a web member.

[0017] Install the web members between adjacent arch rib segments in sequence;

[0018] The splicing arch ribs on both sides are joined together in the middle of the span;

[0019] The longitudinal reinforcement bars between adjacent arch rib segments are connected, and a wet concrete joint is poured.

[0020] Concrete is poured into the steel pipes of the arch rib segments from both sides of the arch foot position.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention utilizes a precast steel-concrete composite slab structure for the fixing plate and steel truss web members. The fixing plate is prefabricated in the factory, and depending on transportation conditions, it can be pre-assembled in the factory or transported to an assembly yard for assembly. The assembled arch rib segments are then transported to the bridge site for assembly and installation. Finally, only the wet joints between the segments need to be poured, and concrete is injected into the steel pipe to form the arch rib, thus making the bridge construction process simple and efficient.

[0023] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing embodiments of the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the cross-section of the arch rib segment described in an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the arch rib segment structure described in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the construction method for the prefabricated composite slab steel truss arch bridge described in this embodiment of the invention.

[0028] Figure 4 This is a schematic diagram of the assembly sequence of the arch rib segments as described in an embodiment of the present invention;

[0029] Figure 5 This is a schematic diagram of the parallel arrangement of the double arch ribs as described in an embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the arrangement of the double-arched ribbed basket as described in an embodiment of the present invention.

[0031] The markings in the diagram are: 1. Precast slab; 2. Second fixing plate; 3. Web member; 4. First steel pipe; 5. Node plate; 6. Longitudinal reinforcement; 7. Second steel pipe; 8. First fixing plate. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. 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 merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this invention, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Example 1:

[0035] See Figure 1 This embodiment provides a prefabricated composite slab steel truss arch bridge structure, including:

[0036] The fixing plate includes a first fixing plate 8 and a second fixing plate 2. The first fixing plate 8 and the second fixing plate 2 are configured identically. The first fixing plate 8 includes a precast plate 1, a first steel pipe 4, a second steel pipe 7, and longitudinal reinforcing bars 6. The precast plate 1 has a dumbbell-shaped cross-section and is a hollow cavity. The first steel pipe 4 and the second steel pipe 7 are both hollow cylinders. The longitudinal reinforcing bars 6 are arranged along the inner wall of the precast plate 1. The first steel pipe 4 and the second steel pipe 7 are respectively arranged longitudinally in the protrusions on both sides of the precast plate 1. The fixing plate is provided with a node plate 5.

[0037] The web member 3 has one end connected to the first fixing plate 8 via the node plate 5, and the other end connected to the second fixing plate 2 via the node plate 5. The web member 3 fixes the first fixing plate 8 and the second fixing plate 2 together.

[0038] In use, the first fixing plate 8, the second fixing plate 2, and the web member 3 are prefabricated in the factory. The first fixing plate 8 and the second fixing plate 2 are both composed of prefabricated plate 1, first steel pipe 4, second steel pipe 7, and longitudinal steel bar 6. The prefabricated plate 1 is made of concrete to ensure the strength of the fixing plate. The fixing plate and the web member 3 can be spliced ​​into arch rib segments in the factory or in the pre-assembly yard, and the arch rib segments can be transported to the construction site for direct assembly between the arch rib segments, making the bridge construction process simple and efficient.

[0039] The length of the longitudinal reinforcement 6 is greater than the longitudinal length of the precast slab 1, the length of the first steel pipe 4 is greater than the length of the longitudinal reinforcement 6, and the second steel pipe 7 is set in the same way as the first steel pipe 4; the longitudinal reinforcement 6 and the steel pipe both extend out of the precast slab 1 to facilitate the connection between adjacent arch rib segments.

[0040] The difference between the length of the longitudinal reinforcing bar 6 and the length of the precast slab 1 is within a first set threshold, and the difference between the length of the first steel pipe 4 and the length of the longitudinal reinforcing bar 6 is within a second set threshold. The second steel pipe 7 is set in the same way as the first steel pipe 4. At the front and rear ends of the first fixed plate 8, the length of the first steel pipe 4 extends beyond the edge of the precast slab 1 by about 0.3 to 0.5 m, and the length of the longitudinal reinforcing bar 6 also extends beyond the edge of the precast slab 1 by about 0.3 to 0.5 m. Both are used as joints to connect adjacent sections. Under normal circumstances, the extension length of the longitudinal reinforcing bar 6 is less than the extension length of the first steel pipe 4.

[0041] The node plate 5 is fixedly connected to the first steel pipe 4 and the second steel pipe 7. Two node plates 5 are respectively installed on the first steel pipe 4 and the second steel pipe 7. Two web members 3 can be installed on the node plate 5. The actual installation position and number of node plates 5 can be determined according to the actual installation situation, and no special restrictions are imposed here.

[0042] The web member 3, the first fixing plate 8, and the second fixing plate 2 constitute an arch rib segment, and multiple arch rib segments are fixedly connected to each other. The main arch rib of the bridge is assembled from multiple arch rib segments. Each arch rib segment is prefabricated and assembled in the factory or pre-assembly yard. During assembly, the second fixing plate 2 is usually lifted and assembled first, then the web member 3 is lifted and assembled, and finally the first fixing plate 8 is lifted and assembled to complete the assembly of the arch rib segment. The arch rib segment is then transported to the bridge site and assembled symmetrically segment by segment from the arch foot until the arch is closed at the mid-span.

[0043] The distance between the inner wall of the precast slab 1 and the outer surface of the first steel pipe 4 and the second steel pipe 7 is not less than a set threshold; the distance between the inner wall of the precast slab 1 and the steel pipe is not less than 0.2m, thereby ensuring the binding of the longitudinal steel bars 6 in the precast slab 1 and the subsequent concrete pouring are dense, ensuring the service life and safety of the building.

[0044] The node plate 5 is a hot-rolled double-sided composite stainless steel structure. The node plate 5 can be made of ordinary steel structure or hot-rolled double-sided composite stainless steel plate. Using hot-rolled double-sided composite stainless steel plate can better resist water accumulation and corrosion when precast concrete slab 1 is used, thus improving durability.

[0045] Web member 3 is an H-shaped steel structure; web member 3 can be made of weathering steel, which eliminates the need for painting and maintenance, thereby reducing the maintenance costs of the steel structure in the later stages.

[0046] The web member 3 is fixed to the node plate 5 by bolts or welding.

[0047] Example 2:

[0048] like Figure 3 As shown in the figure, this embodiment provides a construction method for a prefabricated composite slab steel truss arch bridge. The figure illustrates steps S1, S2, S3, S4, and S5 of this method:

[0049] Step S1. Start splicing the arch rib segments one by one from the arch feet on both sides, and align and weld the outward steel pipe joints of adjacent arch rib segments. The arch rib segment consists of a fixing plate and a web member.

[0050] Step S2. Install the web members between adjacent arch rib segments in sequence;

[0051] Step S3. Close the spliced ​​arch ribs on both sides in the middle of the span;

[0052] Step S4. Connect the longitudinal reinforcement bars between adjacent arch rib segments and pour the outer concrete wet joint.

[0053] Step S5. Pour concrete into the steel pipes of the arch rib segments from the arch feet on both sides.

[0054] Specifically, the arch rib segments are transported to the site one by one, and assembled segment by segment starting from the arch feet on both sides. First, the outward steel pipe joints of the arch rib segments are aligned with the outward steel pipe joints of the already installed segments, and the upper and lower joint steel pipes are welded together. The four steel pipe joints in the fixing plate are all welded together. The remaining web members between the span segments are installed to complete the connection of the two arch rib segments until the arch rib is closed at the mid-span, the arch rib is basically formed, and the steel pipes of each segment are connected as one. After the arch rib is closed, the reserved longitudinal steel bars between the arch rib segments are connected, the stirrups and other steel bars are tied, and then the outer concrete wet joint is poured. All fixing plates are connected to form the arch rib. Finally, concrete is poured into the steel pipes from the arch feet on both sides, first pouring the lower chord steel pipes, then the upper chord steel pipes. The four steel pipes in the fixing plate are completely filled with self-compacting shrinkage-compensating concrete, completing the construction of the entire arch rib. Figure 4 The diagram shown illustrates the assembly sequence of the arch rib segments.

[0055] Specifically, for single-track railways with relatively small arch bridge spans (less than 200m), the arch rib can be a monolithic single-piece arch rib structure; otherwise, the arch rib should be a separate double-piece arch rib structure. Figure 5 The diagram shown is a schematic of the parallel arrangement of two arch ribs. Figure 6 The diagram shows a double-arched ribbed basket-style arrangement.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0057] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A fabricated composite slab steel web member arch bridge structure, characterized by, include: The fixing plate includes a first fixing plate (8) and a second fixing plate (2). The first fixing plate (8) and the second fixing plate (2) are identically configured. The first fixing plate (8) includes a precast slab (1), a first steel pipe (4), a second steel pipe (7), and longitudinal reinforcing bars (6). The precast slab (1) has a dumbbell-shaped cross-section and is a hollow cavity. The first steel pipe (4) and the second steel pipe (7) are both hollow cylinders. The precast slab (1) extends longitudinally to form an overhang joint. The overhang joints of the first steel pipe (4) and the second steel pipe (7) of the adjacent arch rib segment are welded together. After the arch rib is closed, concrete is poured into the welded and connected first steel pipe (4) and second steel pipe (7). The longitudinal steel bar (6) is set along the inner wall of the precast slab (1). The first steel pipe (4) and the second steel pipe (7) are respectively set longitudinally in the protrusions on both sides of the precast slab (1). The fixed plate is provided with a node plate (5). The web member (3) has one end connected to the first fixing plate (8) through the node plate (5) and the other end connected to the second fixing plate (2) through the node plate (5). The web member (3) fixes the first fixing plate (8) and the second fixing plate (2) together.

2. The prefabricated composite steel truss arch bridge structure according to claim 1, characterized in that... The length of the longitudinal reinforcing bar (6) is greater than the longitudinal length of the precast slab (1), the length of the first steel pipe (4) is greater than the length of the longitudinal reinforcing bar (6), and the second steel pipe (7) is configured the same as the first steel pipe (4).

3. The prefabricated composite slab steel truss arch bridge structure according to claim 2, characterized in that... The difference between the length of the longitudinal reinforcing bar (6) and the longitudinal length of the precast slab (1) is within a first set threshold, the difference between the length of the first steel pipe (4) and the length of the longitudinal reinforcing bar (6) is within a second set threshold, and the second steel pipe (7) is configured the same as the first steel pipe (4).

4. The prefabricated composite slab steel truss arch bridge structure according to claim 1, characterized in that... The node plate (5) is fixedly connected to the first steel pipe (4) and the second steel pipe (7). Two node plates (5) are respectively provided on the first steel pipe (4) and the second steel pipe (7). Two web members (3) can be provided on the node plate (5).

5. The prefabricated composite steel truss arch bridge structure according to claim 1, characterized in that... The web member (3), the first fixing plate (8) and the second fixing plate (2) constitute an arch rib segment, and multiple arch rib segments are fixedly connected to each other.

6. The prefabricated composite steel truss arch bridge structure according to claim 1, characterized in that... The distance between the inner wall of the precast slab (1) and the outer surfaces of the first steel pipe (4) and the second steel pipe (7) is not less than a set threshold.

7. The prefabricated composite steel truss arch bridge structure according to claim 1, characterized in that... The node plate (5) is a hot-rolled double-sided composite stainless steel structure.

8. The prefabricated composite steel truss arch bridge structure according to claim 1, characterized in that... The web member (3) is an H-shaped steel structure.

9. The prefabricated composite slab steel truss arch bridge structure according to claim 1, characterized in that... The web member (3) is fixed to the node plate (5) by bolts or welding.

10. A construction method for a prefabricated composite slab steel truss arch bridge structure, applied to the prefabricated composite slab steel truss arch bridge structure as described in claim 1, the method comprising: The arch rib segments are spliced ​​one by one starting from the arch feet on both sides, and the outward steel pipe joints of adjacent arch rib segments are aligned and welded and fixed. The arch rib segment is composed of a fixing plate and a web member. Install the web members between adjacent arch rib segments in sequence; The splicing arch ribs on both sides are joined together in the middle of the span; The longitudinal reinforcement bars between adjacent arch rib segments are connected, and a wet concrete joint is poured. Concrete is poured into the steel pipes of the arch rib segments from both sides of the arch foot position.

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