Fabricated steel-UHPC (Ultra High Performance Concrete) composite beam structure

Abstract

The utility model relates to an assembly type steel-UHPC composite beam structure which comprises a plurality of groove-shaped composite beams, each groove-shaped composite beam comprises a UHPC bridge deck slab and a steel groove-shaped main beam, the UHPC bridge deck slab is provided with a plurality of shear force grooves, the steel groove-shaped main beam is connected with the UHPC bridge deck slab through the shear force grooves, transverse wet joints are arranged between the UHPC bridge deck slabs, and the transverse wet joints are connected with the steel groove-shaped main beam through the shear force grooves. A longitudinal wet joint is arranged between every two adjacent groove-shaped composite beams. The steel-UHPC composite beam structure is high in prefabricating and manufacturing precision, controllable in quality, capable of saving molds and capable of being produced in batches, the bearing capacity of a bridge is guaranteed, meanwhile, the thickness of a bridge deck can be reduced, the dead weight of the bridge can be reduced, the width of a wet joint can be shortened, on-site workloads can be reduced, prefabricating and cast-in-place are combined, and on-site construction time is effectively shortened.

Description

Technical Field

[0001] The utility model relates to the field of bridges, and more specifically, to an assembled steel-UHPC composite beam structure. Background Art

[0002] Ultra-high-performance concrete (UHPC) is a new type of concrete material with excellent mechanical and material properties. Incorporating steel fibers, it boasts high compressive and tensile strength, high impermeability, and excellent durability. Conventional concrete composite beam bridge decks are prone to cracking and water seepage, leading to corrosion of internal reinforcement and requiring frequent maintenance. Furthermore, conventional concrete lacks strength, resulting in heavy decks and making them unsuitable for large spans. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an assembled steel-UHPC composite beam structure, which has a reasonable structure, a short construction period, high durability, and strong economy, and can be widely used in large-span bridges.

[0004] The technical solution adopted by the present invention to solve the technical problem is: constructing an assembled steel-UHPC composite beam structure, including a plurality of trough-type composite beams, the trough-type composite beams including UHPC bridge decks and steel trough-type main beams, the UHPC bridge decks are provided with a plurality of shear grooves, the steel trough-type main beams and the UHPC bridge decks are connected by shear grooves, transverse wet joints are provided between the UHPC bridge decks, and longitudinal wet joints are provided between adjacent trough-type composite beams.

[0005] In the above solution, UHPC is cast in the shear grooves, transverse wet joints and longitudinal wet joints.

[0006] In the above solution, the UHPC bridge deck is a rectangular prefabricated panel with upper and lower surfaces being horizontal planes.

[0007] In the above solution, the shear trough is fixed with a plurality of shear nails at positions corresponding to the steel trough-type main beam.

[0008] In the above solution, a rubber strip is provided in the shear groove.

[0009] In the above solution, the steel channel-shaped main beam is arranged along the width direction of the UHPC bridge deck.

[0010] In the above solution, the steel bars at the interface between the UHPC bridge deck and the adjacent UHPC bridge deck extend to a certain length, the steel bars of the adjacent UHPC bridge decks are formed by binding and overlapping, and the steel bars are double-layer straight bars.

[0011] The implementation of the assembled steel-UHPC composite beam structure of the utility model has the following beneficial effects:

[0012] 1. Ultra-high-performance concrete (UHPC) possesses excellent mechanical and material properties, with high compressive strength and excellent durability. Its use as a new material in the construction of steel-UHPC composite beam structures can eliminate the risk of cracking and leakage in bridge decks, eliminate the need for subsequent maintenance, and reduce overall project costs.

[0013] 2. The steel-UHPC composite beam structure of this utility model adopts an assembly process. Except for the wet joints and shear grooves that need to be cast later, the steel channel-type main beam and UHPC bridge deck are prefabricated in the factory. The prefabrication is highly precise and the quality is controllable. This steel-UHPC composite beam structure can reduce the thickness of the bridge deck, reduce the deadweight of the bridge, shorten the wet joint width, and reduce the on-site workload while ensuring the bearing capacity of the bridge. The combination of prefabrication and cast-in-place effectively shortens the on-site construction time and saves the project schedule. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0015] Figure 1 This is a schematic cross-sectional view of the assembled steel-UHPC composite beam structure of the present invention;

[0016] Figure 2 This is a schematic plan view of the assembled steel-UHPC composite beam structure of the present utility model;

[0017] Figure 3 This is a schematic diagram of the shear groove of the UHPC bridge deck of the assembled steel-UHPC composite beam structure of the utility model;

[0018] Figure 4 This is a schematic cross-sectional diagram of a wet joint of a UHPC bridge deck of the assembled steel-UHPC composite beam structure of the present invention;

[0019] Figure 5 This is a schematic plan view of the wet joint of the UHPC bridge deck of the assembled steel-UHPC composite beam structure of the utility model;

[0020] Description of the accompanying drawings: 1-UHPC bridge deck; 2-steel channel-type main beam; 3-wet joint; 4-shear groove; 5-rubber strip; 6-shear stud; 7-steel bar; 8-channel composite beam. DETAILED DESCRIPTION

[0021] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the specific implementation methods of the present invention are now described in detail with reference to the accompanying drawings.

[0022] like Figure 1-3As shown, the prefabricated steel-UHPC composite beam structure of the present invention includes a plurality of trough-type composite beams 8, each of which includes a UHPC bridge deck 1 and a steel trough-type main beam 2. The UHPC bridge deck 1 is provided with a plurality of shear grooves 4, and the steel trough-type main beam 2 and the UHPC bridge deck 1 are connected by the shear grooves 4. Transverse wet joints 3 are provided between the UHPC bridge decks 1, and longitudinal wet joints 3 are provided between the trough-type composite beams 8. The hoisting position of the UHPC bridge deck 1 corresponds to the position of the steel trough-type main beam 2 through the shear grooves 4. The shear grooves 4 and the wet joints 3 require post-casting of UHPC so that the multiple prefabricated bridge decks 1 and the steel trough-type main beam 2 form a complete composite beam structure.

[0023] The UHPC bridge deck 1 is a rectangular prefabricated panel with horizontal upper and lower surfaces. The UHPC bridge deck 1 is connected to the adjacent UHPC bridge deck 1 through a wet joint 3, and the joint surface needs to be roughened.

[0024] The steel trough main beam 2 is arranged along the width direction of the UHPC bridge deck 1. The steel trough main beam 2 is hoisted onto the bridge in advance, and after the installation is completed, the UHPC bridge deck 1 is hoisted onto the bridge later.

[0025] A number of shear nails 6 are fixed at the shear groove 4 corresponding to the steel trough main beam 2. Rubber strips 5 are set at the shear groove 4 to prevent the post-cast UHPC from flowing out. After the post-cast UHPC solidifies, the UHPC bridge deck 1 and the steel trough main beam 2 are completely combined.

[0026] The steel bars at the interface between the UHPC bridge deck 1 and the adjacent UHPC bridge deck 1 need to extend to a certain length, and the steel bars 7 of the adjacent bridge decks are formed by binding and overlapping, and the steel bars 7 are double-layer straight bars.

[0027] The UHPC bridge deck 1 and the steel channel-type main beam 2 are prefabricated in the factory and assembled on-site after being hoisted and positioned. The size and quantity of the UHPC bridge deck 1 can be controlled according to the requirements of bridge design and construction.

[0028] This new design uses UHPC instead of conventional concrete, eliminating the risk of cracking and leaking in composite beam bridge decks and eliminating subsequent repair costs. Its superior performance significantly reduces concrete usage, resulting in thinner bridge decks and lighter composite beams, further saving on substructure engineering and thus reducing the overall bridge construction cost. Furthermore, the steel-UHPC composite beam structure utilizes an assembled process, significantly reducing the shelf life of UHPC bridge decks compared to conventional concrete bridge decks. Furthermore, the on-site pouring workload is minimal, shortening the overall construction period and addressing national energy conservation and carbon reduction requirements.

[0029] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which are all within the protection of the present invention.

Claims

1. An assembled steel-UHPC composite beam structure, characterized in that: The invention comprises a plurality of trough-type composite beams, wherein the trough-type composite beams comprise UHPC bridge decks and steel trough-type main beams, the UHPC bridge decks are provided with a plurality of shear grooves, the steel trough-type main beams and the UHPC bridge decks are connected via shear grooves, transverse wet joints are provided between the UHPC bridge decks, and longitudinal wet joints are provided between adjacent trough-type composite beams.

2. The assembled steel-UHPC composite beam structure according to claim 1, characterized in that: UHPC is poured into the shear grooves, transverse wet joints and longitudinal wet joints.

3. The assembled steel-UHPC composite beam structure according to claim 1, characterized in that: The UHPC bridge deck is a rectangular prefabricated board, and the upper and lower surfaces are horizontal planes.

4. The assembled steel-UHPC composite beam structure according to claim 1, characterized in that: The shear trough is fixed with a plurality of shear nails at positions corresponding to the steel trough-shaped main beam.

5. The assembled steel-UHPC composite beam structure according to claim 1, characterized in that: A rubber strip is arranged in the shear groove.

6. The assembled steel-UHPC composite beam structure according to claim 1, characterized in that: The steel channel-shaped main beam is arranged along the width direction of the UHPC bridge deck.

7. The assembled steel-UHPC composite beam structure according to claim 1, characterized in that: The steel bars at the interface between the UHPC bridge deck and the adjacent UHPC bridge deck extend to a certain length, the steel bars of the adjacent UHPC bridge decks are formed by binding and overlapping, and the steel bars are double-layer straight bars.

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