Fabricated UHPC narrow steel box girder composite beam

Abstract

The utility model discloses an assembly type UHPC narrow steel box girder composite beam which is structurally characterized in that a plurality of prefabricated UHPC bridge deck slabs are connected side by side through transverse joints, the bottoms of the prefabricated UHPC bridge deck slabs connected side by side are connected to a plurality of narrow steel box girders through box type shear connectors, and the narrow steel box girders are connected through a plurality of transverse connectors. The prefabricated UHPC bridge deck slab has the advantages that the prefabricated assembly degree is high, the number of wet joints is small, the supports extend out of the joints of the prefabricated UHPC bridge deck slab, no formwork is needed during construction, the construction period is shortened, and the construction efficiency is improved; the box-type shear connector is pre-buried in the UHPC bridge deck slab in the prefabrication stage of the UHPC bridge deck slab, so that the integrity of the shear connector and the bridge deck slab is improved, the problem of conflict between bridge deck slab reinforcing steel bars and shear keys on a construction site is solved, meanwhile, the steel-concrete composite beam construction steps are reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, and particularly relates to an assembled UHPC narrow steel box girder composite beam. Background Art

[0002] A steel-concrete composite beam bridge is a beam bridge in which a steel beam and a concrete slab are connected into a whole by connectors. This structure gives full play to the respective advantages of concrete and steel, that is, concrete bears large compressive stress and steel bears large tensile stress. At the same time, the steel-concrete composite beam bridge has the characteristics of high bearing capacity, light self-weight, high stiffness and good ductility, and is the most widely used beam bridge structure at the present stage.

[0003] However, ordinary steel-concrete composite beams also have many deficiencies. For example, there are many wet joints in the concrete bridge deck, which requires a long construction time on site. The steel bars in the bridge deck and the stud bolts are prone to conflict and need to be avoided on site. The stud bolts have poor tensile and pull-out effects, the overall performance of the steel-concrete composite beam is poor, and the joint between the stud bolts and the concrete is prone to cracking, etc., which is not conducive to the durability of the structure. Therefore, a steel-concrete composite beam bridge with a more optimized and reasonable structural configuration, good shear resistance and faster construction is needed. Summary of the Invention

[0004] In order to solve the problems introduced in the background art, the utility model provides an assembled UHPC (Ultra High Performance Concrete) narrow steel box girder composite beam. The narrow steel box girder composite beam has a high degree of prefabrication and assembly, few wet joints, and the joints of the precast UHPC bridge deck extend out the brackets. During construction, no formwork is required, which is beneficial to shortening the construction period and improving the construction efficiency.

[0005] The technical solution adopted by the utility model is as follows: an assembled UHPC narrow steel box girder composite beam, including a precast UHPC bridge deck, a narrow steel box girder, a transverse connector, a transverse joint and a box-type shear connector, characterized in that: a plurality of precast UHPC bridge decks are connected side by side through transverse joints, and the bottoms of the plurality of precast UHPC bridge decks connected side by side are connected to a plurality of narrow steel box girders through box-type shear connectors, and the plurality of narrow steel box girders are connected through a plurality of transverse connectors.

[0006] Furthermore, the narrow steel box girder includes a narrow steel box girder upper flange plate, a narrow steel box girder lower flange plate, a narrow steel box girder web and a narrow steel box girder diaphragm; two narrow steel box girder webs are located on both sides of the narrow steel box girder, the upper ends of the narrow steel box girder webs are welded to the narrow steel box girder upper flange plate, the lower ends of the narrow steel box girder webs are welded to the narrow steel box girder lower flange plate, and a plurality of narrow steel box girder diaphragms are arranged perpendicular to the narrow steel box girder webs, and the peripheries of the plurality of narrow steel box girder diaphragms are welded to the narrow steel box girder upper flange plate and the narrow steel box girder lower flange plate.

[0007] Furthermore, a number of box - type shear connectors are provided on the upper flange plate of the narrow - width steel box girder. The precast UHPC bridge deck is connected to the upper flange plate of the narrow - width steel box girder on the narrow - width steel box girder through a number of box - type shear connectors. At least one box - type shear connector is provided at the connection between each precast UHPC bridge deck and each narrow - width steel box girder.

[0008] Furthermore, the shape of the transverse joint is semi - circular, and a 5 - cm - thick bearing extends from the bottom to provide a formwork for the cast - in - place concrete of the joint.

[0009] Furthermore, the box - type shear connector includes a box - type shear key shell, a box - type shear key cover plate, transverse bridge deck steel bars, and longitudinal bridge deck steel bars; the box - type shear key shell is perforated at positions corresponding to the steel bar positions of the precast UHPC bridge deck around its perimeter. The transverse bridge deck steel bars and the longitudinal bridge deck steel bars pass through the openings around the perimeter of the box - type shear key shell. The upper end of the box - type shear key shell is connected to the box - type shear key cover plate, and the lower end is connected to the upper flange plate of the narrow - width steel box girder.

[0010] Furthermore, the length direction of the narrow - width steel box girder is consistent with the longitudinal direction of the bridge, and multiple narrow - width steel box girders are arranged in parallel in the transverse direction of the bridge.

[0011] Furthermore, the spacing between the transverse joints is 4.0 m - 6.0 m; the spacing between the narrow - width steel box girders in the transverse direction of the bridge is 6.0 m - 8.0 m.

[0012] Furthermore, during on - site construction, the box - type shear connector with the box - type shear key cover plate removed is precast together with the precast UHPC bridge deck. The precast UHPC bridge deck is hoisted to the designed position on the top surface of the narrow - width steel box girder. The box - type shear connector is welded or bolted to the upper flange plate of the narrow - width steel box girder, thus fixing the precast UHPC bridge deck. Then, the box - type shear key cover plate is welded to the box - type shear key shell.

[0013] The utility model has the following beneficial effects: The utility model has a high degree of prefabrication and assembly, fewer wet joints. The precast UHPC bridge deck has a bearing extending at the joint, and no formwork is required during construction, which is beneficial to shortening the construction period and improving the construction efficiency.

[0014] The utility model adopts a new type of box - type shear connector. By embedding the box - type shear connector in the UHPC bridge deck during the precast stage of the UHPC bridge deck, the integrity of the shear connector and the bridge deck is improved, the problem of conflict between the bridge deck steel bars and the shear key at the construction site is solved, and at the same time, the construction steps of the steel - concrete composite beam are reduced, and the construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the overall schematic diagram of the utility model.

[0016] Figure 2This is a partial schematic diagram of the joint of the bridge deck slab of the present utility model.

[0017] Figure 3 This is a structural decomposition schematic diagram of the narrow-width steel box girder of the present utility model.

[0018] Figure 4 This is a structural decomposition schematic diagram of the box-type shear connector of the present utility model.

[0019] The reference numerals used in the drawings are as follows: 1, precast UHPC bridge deck slab; 2, narrow-width steel box girder; 21, upper flange plate of narrow-width steel box girder; 22, lower flange plate of narrow-width steel box girder; 23, web plate of narrow-width steel box girder; 24, transverse diaphragm of narrow-width steel box girder; 3, transverse connection member; 4, transverse joint; 5, box-type shear connector; 51, box-type shear key housing; 52, box-type shear key cover plate; 53, transverse reinforcement of bridge deck slab; 54, longitudinal reinforcement of bridge deck slab. Detailed implementation manners

[0020] As Figures 1-4 shown, an assembled UHPC narrow-width steel box girder composite beam includes a precast UHPC bridge deck slab 1, a narrow-width steel box girder 2, a transverse connection member 3, a transverse joint 4, and a box-type shear connector 5, and is characterized in that: a plurality of precast UHPC bridge deck slabs 1 are connected side by side through a transverse joint 4, the bottoms of the plurality of precast UHPC bridge deck slabs 1 connected side by side are connected to a plurality of narrow-width steel box girders 2 through box-type shear connectors 5, and the plurality of narrow-width steel box girders 2 are connected through a plurality of transverse connection members 3.

[0021] The narrow-width steel box girder 2 includes an upper flange plate 21 of narrow-width steel box girder, a lower flange plate 22 of narrow-width steel box girder, a web plate 23 of narrow-width steel box girder, and a transverse diaphragm 24 of narrow-width steel box girder; two web plates 23 of narrow-width steel box girder are located on both sides of the narrow-width steel box girder 2, the upper ends of the web plates 23 of narrow-width steel box girder are welded to the upper flange plate 21 of narrow-width steel box girder, the lower ends of the web plates 23 of narrow-width steel box girder are welded to the lower flange plate 22 of narrow-width steel box girder, a plurality of transverse diaphragms 24 of narrow-width steel box girder are arranged perpendicular to the web plates 23 of narrow-width steel box girder, and the peripheries of the plurality of transverse diaphragms 24 of narrow-width steel box girder are welded to the upper flange plate 21 of narrow-width steel box girder and the lower flange plate 22 of narrow-width steel box girder.

[0022] The box-type shear connector 5 includes a box-type shear key housing 51, a box-type shear key cover plate 52, a transverse reinforcement 53 of bridge deck slab, and a longitudinal reinforcement 54 of bridge deck slab; the box-type shear key housing 51 is provided with openings at positions corresponding to the reinforcement of the precast UHPC bridge deck slab 1 around, the transverse reinforcement 53 of bridge deck slab and the longitudinal reinforcement 54 of bridge deck slab pass through the openings around the box-type shear key housing 51, the upper end of the box-type shear key housing 51 is connected to the box-type shear key cover plate 52, and the lower end is connected to the upper flange plate 21 of narrow-width steel box girder.

[0023] Combined with Figure 1 WithFigure 3 As shown, except for the box shear key cover plate 52, the box shear connector 5 is precast together with the precast UHPC bridge deck 1. During on-site construction, the precast UHPC bridge deck 1 is hoisted to the designed position of the upper flange plate 21 of the narrow steel box girder. The box shear connector 5 is welded or bolted to the upper flange 21 of the narrow steel box girder to fix the precast UHPC bridge deck 1. Then, the box shear key cover plate 52 is welded to the box shear key housing 51. After all the precast UHPC bridge decks 1 are hoisted and fixed, the precast UHPC bridge deck 1 is cast in situ at the transverse joint 4 to make each precast UHPC bridge deck 1 form an integral body.

[0024] Preferably, the spacing between the transverse connectors 3 is 5.0 m.

[0025] Preferably, the spacing between the narrow steel box girders in the transverse direction of the bridge is 7.0 m.

[0026] However, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as it is within the scope of the spirit of the present invention, changes and modifications to the above embodiments will fall within the scope of the claims of the present invention.

Claims

1. A prefabricated UHPC narrow - width steel box girder composite beam, comprising a precast UHPC bridge deck, a narrow - width steel box girder, transverse connectors, transverse joints and box - type shear connectors, characterized in that: Several precast UHPC bridge decks are connected side by side through transverse joints. The bottoms of several precast UHPC bridge decks connected side by side are connected to several narrow steel box girders through box shear connectors, and several narrow steel box girders are connected through several transverse connectors.

2. The prefabricated UHPC narrow steel box girder composite beam according to claim 1, characterized in that: The narrow steel box girder includes an upper flange plate of the narrow steel box girder, a lower flange plate of the narrow steel box girder, a web plate of the narrow steel box girder, and a diaphragm of the narrow steel box girder; two web plates of the narrow steel box girder are located on both sides of the narrow steel box girder. The upper end of the web plate of the narrow steel box girder is welded to the upper flange plate of the narrow steel box girder, and the lower end of the web plate of the narrow steel box girder is welded to the lower flange plate of the narrow steel box girder. Several diaphragms of the narrow steel box girder are arranged perpendicular to the web plate of the narrow steel box girder, and the peripheries of several diaphragms of the narrow steel box girder are welded to the upper flange plate and the lower flange plate of the narrow steel box girder.

3. The prefabricated UHPC narrow steel box girder composite beam according to claim 2, wherein: Several box shear connectors are provided on the upper flange plate of the narrow steel box girder. The precast UHPC bridge deck is connected to the upper flange plate of the narrow steel box girder on the narrow steel box girder through several box shear connectors. At least one box shear connector is provided at the connection between each precast UHPC bridge deck and each narrow steel box girder.

4. The prefabricated UHPC narrow steel box girder composite beam according to claim 3, characterized in that: The shape of the transverse joint is semi-circular, and a 5 cm thick bearing extends at the bottom.

5. The prefabricated UHPC narrow steel box girder composite beam according to claim 4, characterized in that: The box shear connector includes a box shear key housing, a box shear key cover plate, transverse bridge deck reinforcement, and longitudinal bridge deck reinforcement; holes are opened around the box shear key housing corresponding to the positions of the reinforcement of the precast UHPC bridge deck. The transverse bridge deck reinforcement and the longitudinal bridge deck reinforcement pass through the holes around the box shear key housing. The upper end of the box shear key housing is connected to the box shear key cover plate, and the lower end is connected to the upper flange plate of the narrow steel box girder.

6. The prefabricated UHPC narrow steel box girder composite beam according to claim 5, characterized in that: The length direction of the narrow steel box girder is consistent with the longitudinal direction of the bridge, and multiple narrow steel box girders are arranged in parallel in the transverse direction of the bridge.

7. The prefabricated UHPC narrow steel box girder composite beam according to claim 6, wherein: The spacing between transverse joints is 4.0 m - 6.0 m; the spacing between narrow steel box girders in the transverse direction of the bridge is 6.0 m - 8.0 m.

8. The prefabricated UHPC narrow steel box girder composite beam according to claim 7, wherein: During on-site construction, the box shear connector with the box shear key cover plate removed is precast together with the precast UHPC bridge deck. The precast UHPC bridge deck is hoisted to the designed position on the top surface of the narrow steel box girder. The box shear connector is welded or bolted to the upper flange plate of the narrow steel box girder, thus fixing the precast UHPC bridge deck. Then, the box shear key cover plate is welded to the box shear key housing.

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