Steel-UHPC prefabricated assembled arc-shaped arch rib and arch bridge

Abstract

The utility model discloses a steel-UHPC prefabricated assembly type arc-shaped arch rib and an arch bridge, and relates to the technical field of suspender arch bridges, the steel-UHPC prefabricated assembly type arc-shaped arch rib comprises a plurality of prefabricated rib sections, and each prefabricated rib section comprises a built-in hollow thin-wall steel box body section and a UHPC outer box body section wrapping the periphery of a hollow thin-wall steel box body. The two ends of the hollow thin-wall steel box body sections extend out of the UHPC outer box body sections, shear nails used for being embedded in the UHPC outer box body sections are arranged on the hollow thin-wall steel box body sections, and the multiple prefabricated rib sections are sequentially spliced in the arc direction and connected through UHPC wet joints to form the arc-shaped arch rib. According to the steel-UHPC prefabricated assembly type arc-shaped arch rib, the self-weight is light, the applicable arch bridge span is larger, the structure is lighter, the local rigidity of the steel structure can be effectively enhanced by adopting the externally-wrapped UHPC layer, the hollow thin-wall steel box body sections can serve as templates for externally-wrapped concrete pouring, an inner mold is not needed, and the steel-UHPC prefabricated assembly type arc-shaped arch rib is simple in structure and convenient to use. And the prefabricated rib sections are convenient to construct and obtain.

Description

Technical Field

[0001] The utility model relates to the technical field of hanger arch bridges, and in particular to a steel-UHPC prefabricated assembled arc-shaped arch rib and an arch bridge. Background Art

[0002] Arch ribs commonly used in arch bridges include reinforced concrete arch ribs, steel tube concrete arch ribs and steel box arch ribs. Reinforced concrete arch ribs are difficult to apply to large-span structures due to their heavy weight; when the span of steel tube concrete arch ribs is greater than 150m, it is advisable to use a truss main arch, which is not conducive to the connection with the main beam in a simply supported tie arch bridge. In addition, steel tube concrete arch ribs are exposed to many defects during use, such as hollowing of concrete in the tube and local deformation of the steel tube, which have a great impact on the bearing capacity of steel tube concrete arch bridges; steel box arch ribs are the most commonly used arch ring form for large-span arch bridges, but the cost of steel box arch ribs is high, and the deformation resistance of thin-walled steel box structures is weak. In addition, steel box arch ribs require more longitudinal and transverse stiffening ribs, and the workload of arch rib processing, production and welding is large, and the cost of later anti-corrosion and maintenance of steel structure arch ribs is high.

[0003] In view of this, it is necessary to propose a steel-UHPC prefabricated assembled curved arch rib and arch bridge to solve or at least alleviate the above defects. Utility Model Content

[0004] The main purpose of the utility model is to provide a steel-UHPC prefabricated assembled arc-shaped arch rib and an arch bridge, aiming to solve the technical problem that the existing arch bridges use reinforced concrete arch ribs, which result in excessive deadweight and are difficult to be applied to large-span structures.

[0005] To achieve the above-mentioned purpose, the utility model provides a steel-UHPC prefabricated assembled arc-shaped arch rib, comprising a plurality of prefabricated rib segments, wherein the prefabricated rib segments comprise a built-in hollow thin-walled steel box segment and a UHPC outer box segment wrapped around the outer periphery of the hollow thin-walled steel box, both ends of the hollow thin-walled steel box segment extend out of the UHPC outer box segment, and the hollow thin-walled steel box segment is provided with shear nails for being buried in the UHPC outer box segment, and the plurality of prefabricated rib segments are sequentially spliced ​​along the arc direction and connected through UHPC wet joints to form an arc-shaped arch rib.

[0006] Furthermore, a transverse partition plate arranged along the normal direction of the arc-shaped arch rib is provided in the hollow thin-walled steel box segment.

[0007] Furthermore, the transverse partition is a manhole partition having a manhole.

[0008] Furthermore, the wall thickness of the hollow thin-walled steel box segment of the prefabricated rib segment at the bottom is greater than the wall thickness of the hollow thin-walled steel box segment of the prefabricated rib segment adjacent to it.

[0009] Furthermore, the hollow thin-walled steel box segment is a polygonal structural box, and the UHPC outer box segment is arranged around the hollow thin-walled steel box.

[0010] Furthermore, the cross section of the hollow thin-walled steel box segment is a rectangular cross section with chamfered right angles on all sides.

[0011] Furthermore, an exposed steel plate connection surface is reserved on the inner side of the prefabricated rib segment.

[0012] Furthermore, shear studs are provided in all directions around the hollow thin-walled steel box segment.

[0013] Furthermore, the wall thickness of the hollow thin-walled steel box segment is 8-16 cm, and the wall thickness of the UHPC outer box segment is 8-12 cm.

[0014] The utility model also provides an arch bridge, comprising a bridge deck structure and the above-mentioned steel-UHPC prefabricated assembled arcuate arch ribs, wherein the transverse sides of the bridge deck structure are respectively provided with steel-UHPC prefabricated assembled arcuate arch ribs, and the steel-UHPC prefabricated assembled arcuate arch ribs are connected to both ends of the longitudinal sides of the bridge deck structure on the corresponding side.

[0015] Compared with the prior art, the steel-UHPC prefabricated assembled arc-shaped arch rib provided by the utility model has the following beneficial effects:

[0016] The steel-UHPC prefabricated assembled arc-shaped arch rib provided by the utility model comprises a plurality of prefabricated rib segments, wherein the prefabricated rib segments comprise a built-in hollow thin-walled steel box segment and a UHPC outer box segment wrapped around the outer periphery of the hollow thin-walled steel box, the hollow thin-walled steel box segment and the UHPC outer box segment are mutually connected by shear nails, and adjacent prefabricated rib segments are mutually welded through the mutually connected hollow thin-walled steel box segments and then UHPC wet joints are arranged at the splicing positions; the steel-UHPC prefabricated assembled arc-shaped arch rib is light in weight, applicable to arch bridges with larger spans, and lighter in structure; the use of the wrapped UHPC layer can effectively strengthen the local stiffness of the steel structure; the hollow thin-walled steel box segment can be used as a template for pouring outer concrete without the need for an inner template, and the construction and acquisition of the prefabricated rib segment is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0018] Figure 1It is a structural schematic diagram of a steel-UHPC prefabricated assembled arc-shaped arch rib in one embodiment of the utility model;

[0019] Figure 2 Schematic diagram of the cross-sectional structure of a steel-UHPC prefabricated assembled arc-shaped arch rib in one embodiment of the utility model; wherein: Figure 2 a is a schematic diagram of the cross-section structure at a general position. Figure 2 b is a schematic diagram of the cross-sectional structure at the location of the diaphragm;

[0020] Figure 3 The figure is a schematic diagram of an arch bridge structure in one embodiment of the utility model.

[0021] Legend:

[0022] 100. Arch bridge; 10. Bridge deck structure; 20. Steel-UHPC prefabricated assembled curved arch rib; 21. Prefabricated rib segment; 211. Hollow thin-walled steel box segment; 212. UHPC outer box segment; 213. Shear studs; 214. Diaphragm; 22. UHPC wet joint.

[0023] The purpose, features and advantages of the present invention will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0024] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0027] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0028] Please refer to the attached Figure 1 , Figure 2 as well as Figure 3 The utility model provides a steel-UHPC prefabricated assembled arc-shaped arch rib 20, comprising a plurality of prefabricated rib segments 21, wherein the prefabricated rib segment 21 comprises a built-in hollow thin-walled steel box segment 211 and a UHPC outer box segment 212 wrapped around the outer periphery of the hollow thin-walled steel box, both ends of the hollow thin-walled steel box segment 211 extend out of the UHPC outer box segment 212, and a shear nail 213 for being buried in the UHPC outer box segment 212 is provided on the hollow thin-walled steel box segment 211, and the plurality of prefabricated rib segments 21 are sequentially spliced ​​along the arc direction and connected through the UHPC wet joint 22 to form an arc-shaped arch rib.

[0029] The steel-UHPC prefabricated assembled arc-shaped arch rib 20 provided by the utility model comprises a plurality of prefabricated rib segments 21, wherein the prefabricated rib segments 21 comprise a built-in hollow thin-walled steel box segment 211 and a UHPC outer box segment 212 wrapped around the outer periphery of the hollow thin-walled steel box, wherein the hollow thin-walled steel box segment 211 and the UHPC outer box segment 212 are connected to each other through shear nails 213, and adjacent prefabricated rib segments 21 are connected to each other through hollow The hollow thin-walled steel box segments 211 are welded to each other and then UHPC wet joints 22 are set at the joint positions; the steel-UHPC prefabricated assembled arc arch ribs 20 are light in weight, and are applicable to arch bridges 100 with larger spans and lighter structures. The use of an outsourced UHPC layer can effectively enhance the local stiffness of the steel structure, and the hollow thin-walled steel box segments 211 can be used as a template for outsourced concrete pouring without the need for an inner mold, making it convenient to obtain the prefabricated rib segments 21 during construction.

[0030] It can be understood that the shear studs 213213 are φ16x60mm welded studs; the steel-UHPC prefabricated assembled arc-shaped arch rib 20 of the utility model has an arch rib span of 180m to 300m and a rise-span ratio of 1 / 4.5 to 1 / 5.5.

[0031] Furthermore, a transverse partition 214 arranged along the normal direction of the arcuate arch rib is provided in the hollow thin-walled steel box segment 211. It can be understood that the transverse partition 214 is a cross-section dense partition or a manhole partition with a manhole, and a plurality of transverse partitions 214 are arranged at intervals along the bending direction of the steel-UHPC prefabricated assembled arcuate arch rib 20 (prefabricated rib segment 21). There is no need to set complex longitudinal and transverse stiffening ribs in the arcuate arch rib, the arch rib processing and welding workload is small, the construction is simpler, and the dead weight of the arcuate arch rib is reduced.

[0032] Furthermore, in order to improve the performance of the bridge, longitudinal and transverse stiffening ribs are provided in the hollow thin-walled steel box segment 211 of the prefabricated rib segment 21 connected to the tie rod unit. The longitudinal and transverse stiffening ribs are formed by intersecting and splicing 2-5 longitudinal partitions and 1-3 transverse partitions 214.

[0033] Furthermore, in order to ensure the stress-bearing performance of the structure, the wall thickness of the hollow thin-walled steel box segment 211 of the prefabricated rib segment 21 at the bottom is greater than the wall thickness of the hollow thin-walled steel box segment 211 of the adjacent prefabricated rib segment 21. In the present utility model, the prefabricated rib segment 21 above the prefabricated rib segment 21 at the bottom segment is a standard segment rib, and the thickness of the hollow thin-walled steel box segment 211 of the standard segment rib is 10mm, and the bottom segment is thickened to 16mm; specifically, a transverse partition 214 perpendicular to the arch axis is arranged every 2m inside the hollow thin-walled steel box segment 211, and the thickness of the transverse partition 214214 is 12-14mm.

[0034] Furthermore, the hollow thin-walled steel box segment 211 is a polygonal structural box, and the UHPC outer box segment 212 is arranged around the hollow thin-walled steel box segment 211. Specifically, the cross-section of the hollow thin-walled steel box segment 211 is a rectangular cross-section with chamfered right angles on all sides. In a specific embodiment of the utility model, the material of the hollow thin-walled steel box segment 211 is Q355D, and the material of the UHPC outer box segment 212 is U140; the outer UHPC layer adopts a rectangular cross-section with chamfered corners on all sides, with a width of 2.0m and a height of 3.0m, and the chamfers are 35.86cmx35.86cm on all sides. The UHPC layer is 10cm thick, and a layer of HRB400 steel mesh with a diameter of 10mm arranged at a spacing of 10cmx10cm is arranged inside. The hollow thin-walled steel box 2111 adopts a rectangular cross-section with chamfered corners on all sides, with a width of 1.8m and a height of 2.8m, and the chamfers are 30cmx30cm on all sides.

[0035] Furthermore, in order to facilitate the arrangement of wind bracing, an exposed steel plate connection surface is reserved on the inner side of the prefabricated rib segment 21 .

[0036] Furthermore, shear studs 213 are provided on all sides of the hollow thin-walled steel box segment 211 .

[0037] Furthermore, the wall thickness of the hollow thin-walled steel box segment 211 is 8-16 cm, and the wall thickness of the UHPC outer box segment 212 is 8-12 cm.

[0038] Please refer to the attached Figure 3 The utility model also provides an arch bridge 100, including a bridge deck structure 10 and the above-mentioned steel-UHPC prefabricated assembled arcuate arch ribs 20, wherein the transverse sides of the bridge deck structure 10 are respectively provided with steel-UHPC prefabricated assembled arcuate arch ribs 20, and the steel-UHPC prefabricated assembled arcuate arch ribs 20 are interconnected with the longitudinal ends of the bridge deck structure 10 on the corresponding side; more preferably, the bridge deck structure 10 adopts a steel-concrete composite beam; the arch bridge 100 adopts a design scheme of steel-UHPC arch ribs and steel-concrete composite beams, and the steel-UHPC prefabricated assembled arcuate arch ribs 20 are simple to construct and have good economic benefits while ensuring mechanical properties.

[0039] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A steel-UHPC prefabricated assembled arc-shaped arch rib, characterized in that: The invention comprises a plurality of prefabricated rib segments, wherein the prefabricated rib segments comprise a built-in hollow thin-walled steel box segment and a UHPC outer box segment wrapped around the outer periphery of the hollow thin-walled steel box segment, both ends of the hollow thin-walled steel box segment extend out of the UHPC outer box segment, and the hollow thin-walled steel box segment is provided with shear nails for embedding in the UHPC outer box segment. A plurality of the prefabricated rib segments are sequentially spliced ​​along the arc direction and connected through UHPC wet joints to form an arc-shaped arch rib.

2. The steel-UHPC prefabricated assembled arc-shaped arch rib according to claim 1, characterized in that: A transverse partition plate arranged along the normal direction of the arc-shaped arch rib is provided in the hollow thin-walled steel box segment.

3. The steel-UHPC prefabricated assembled arc-shaped arch rib according to claim 2, characterized in that: The transverse partition is a manhole partition with a manhole.

4. The steel-UHPC prefabricated assembled arc-shaped arch rib according to claim 1, characterized in that: The wall thickness of the hollow thin-walled steel box segment of the prefabricated rib segment at the bottom is greater than the wall thickness of the hollow thin-walled steel box segment of the prefabricated rib segment adjacent to it.

5. The steel-UHPC prefabricated assembled arc-shaped arch rib according to claim 1, characterized in that: The hollow thin-walled steel box segment is a polygonal structural box, and the UHPC outer box segment is arranged around the hollow thin-walled steel box segment.

6. The steel-UHPC prefabricated assembled arc-shaped arch rib according to claim 5, characterized in that: The cross section of the hollow thin-walled steel box segment is a rectangular cross section with chamfered right angles on all sides.

7. The steel-UHPC prefabricated assembled arc-shaped arch rib according to any one of claims 1 to 6, characterized in that: An exposed steel plate connection surface is reserved on the inner side of the prefabricated rib segment.

8. The steel-UHPC prefabricated assembled arc-shaped arch rib according to any one of claims 1 to 6, characterized in that: The shear nails are arranged in all directions around the hollow thin-walled steel box segment.

9. The steel-UHPC prefabricated assembled arc-shaped arch rib according to any one of claims 1 to 6, characterized in that: The wall thickness of the hollow thin-walled steel box segment is 8-16 cm, and the wall thickness of the UHPC outer box segment is 8-12 cm.

10. An arch bridge, characterized in that: It comprises a bridge deck structure and a steel-UHPC prefabricated assembled arc-shaped arch rib as claimed in any one of claims 1 to 9, The steel-UHPC prefabricated assembled arcuate arch ribs are respectively provided on both sides of the transverse direction of the bridge deck structure, and the steel-UHPC prefabricated assembled arcuate arch ribs are connected to both ends of the longitudinal direction of the bridge deck structure on the corresponding side.

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