Wet joint structure of a steel-concrete composite structure bridge and its construction method

Abstract

The present invention provides a wet joint structure of a steel-concrete composite structure bridge and a construction method thereof, comprising a steel beam and a precast bridge deck, the precast bridge deck being divided into a left precast bridge deck and a right precast bridge deck, a wet joint being formed between the left precast bridge deck and the right precast bridge deck, concrete being poured in the wet joint, bolts being welded on the upper flange plate of the steel beam, the left precast bridge deck and the right precast bridge deck being both provided with an upper and lower layer of embedded steel bars extending into the wet joint, the end portion of the lower layer of embedded steel bars of the left precast bridge deck being bent downward and then passed through the upper flange plate on the right side of the steel beam web for fixation, the end portion of the lower layer of embedded steel bars of the right precast bridge deck being bent downward and then passed through the upper flange plate on the left side of the steel beam web for fixation, the upper layer of embedded steel bars of the left precast bridge deck and the right precast bridge deck being welded and connected, the present invention has a fast construction speed, also has the functions of an anti-pullout connector and an anti-shear connector, has a high degree of industrialization, significantly reduces the workload of on-site steel bar welding at the wet joint, and improves the overall construction efficiency of the bridge.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction engineering, and particularly relates to a wet joint structure of a steel-concrete composite structure bridge and a construction method thereof. Background Art

[0002] Steel-concrete composite bridges have been rapidly adopted in bridge construction in my country in recent years due to their advantages, including fast construction, minimal environmental impact, and labor savings. In steel-concrete composite bridges, wet joints, which connect the upper flange of the steel beam to the precast bridge deck, are a critical component of prefabricated steel-concrete composite bridge structures. The construction and construction methods of wet joints have become key technologies for achieving rapid and high-quality integration of steel beams and concrete decks.

[0003] To ensure the mechanical performance of the bridge deck, existing wet-joint structures in steel-concrete composite bridges typically weld the precast rebar of the precast decks on both sides together, then install the rebar along the wet joint, and finally pour the wet-joint concrete. The precast rebar of the precast decks on both sides of the wet joint is divided into two layers. Welding the upper layer of embedded rebar is relatively easy, but welding the lower layer of embedded rebar is very difficult due to the limited operating space, making it difficult to ensure welding quality and slow to connect, affecting the overall construction efficiency of the bridge. Summary of the Invention

[0004] To solve the above problems, the present invention discloses a wet joint structure and construction method for a steel-concrete composite structure bridge, which solves the problems of welding difficulties and difficulty in ensuring connection quality due to small space during conventional operations. It also has the functions of pull-out resistant connectors and shear resistant connectors, has a fast construction speed and a high degree of industrialization, significantly reduces the workload of on-site steel bar welding at wet joints, and improves the overall construction efficiency of the bridge.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A wet joint structure of a steel-concrete composite bridge comprises a steel beam, a precast bridge deck and a wet joint, wherein the precast bridge deck is divided into a left precast bridge deck and a right precast bridge deck, concrete is poured in the wet joint, vertical studs are welded on the upper flange plate of the steel beam, the steel beam is arranged below between the left precast bridge deck and the right precast bridge deck, rubber pads are placed between the left and right precast bridge decks and the upper flange plates of the steel beam, the left and right precast bridge decks are both provided with upper and lower layers of embedded steel bars extending into the wet joint, the left and right precast bridge decks are provided with upper and lower layers of embedded steel bars extending into the wet joint, and the left and right precast bridge decks are provided with lower and upper layers of embedded steel bars extending into the wet joint. The embedded steel bars corresponding to the bridge deck are staggered and arranged adjacent to each other in the direction of the wet joint. The end of the lower layer of embedded steel bars of the left prefabricated bridge deck is bent downward and passes through the upper flange plate on the right side of the steel beam web and is fixedly connected to the upper flange plate of the steel beam through upper and lower nuts A. The end of the lower layer of embedded steel bars of the right prefabricated bridge deck is bent downward and passes through the upper flange plate on the left side of the steel beam web and is fixedly connected to the upper flange plate of the steel beam through upper and lower nuts B. The upper embedded steel bars of the left prefabricated bridge deck and the right prefabricated bridge deck are welded together.

[0007] Furthermore, the downwardly bent section of the end portion of the embedded steel bars in the lower layer of the prefabricated bridge deck is threaded.

[0008] Furthermore, the upper flange of the steel beam is provided with bolt holes that match the embedded steel bars in the lower layer of the prefabricated slab bridge deck.

[0009] Furthermore, a gasket is provided between the upper and lower nuts of the embedded steel bars in the lower layer of the prefabricated bridge deck and the upper flange plate of the steel beam.

[0010] Furthermore, steel bars are provided in the wet joint along the direction of the wet joint.

[0011] The construction method of the wet joint of the prefabricated assembled steel-concrete composite structure bridge of the present invention comprises the following specific steps:

[0012] a. Precast concrete bridge deck;

[0013] b. The steel beams are processed and manufactured in the factory. Studs are welded to the upper flange plates of the steel beams and bolt holes are opened to match the embedded steel bars in the lower layer of the precast slab bridge deck;

[0014] c. Erect steel beams on site and install rubber pads on the upper flange plates of the steel beams;

[0015] d. Install nuts on the downward-bent end of the embedded steel bars in the lower layer of the precast concrete bridge deck and tighten them to the top;

[0016] e. Hoist the precast concrete bridge deck into place on site, so that the downwardly bent end of the embedded steel bars in the lower layer passes through the corresponding bolt holes on the upper flange plate of the steel beam;

[0017] f. Tighten the upper nuts of the lower pre-embedded steel bars to the upper flange plate of the steel beam, install the lower nuts of the lower pre-embedded steel bars, and tighten them to the upper flange plate of the steel beam;

[0018] g. Welding the upper embedded steel bars of the prefabricated bridge decks on the left and right sides;

[0019] h. Install steel bars along the wet joint direction and pour wet joint concrete.

[0020] The beneficial effects of the present invention are:

[0021] 1. This invention anchors and transmits force by bolting the lower layer of embedded steel bars in the precast concrete bridge deck to the upper flange plate of the steel beam. This solves the problem of difficult welding connection construction and poor connection quality between the lower layer embedded steel bars in conventional wet joints of precast bridge decks due to limited operating space.

[0022] 2. The connection structure between the lower layer of embedded steel bars in the precast concrete bridge deck and the upper flange plate of the steel beam in the present invention not only anchors and transmits force to the lower layer of embedded steel bars, but also serves as an anti-pullout connector, effectively enhancing the ability of the wet joint concrete to resist vertical separation and uplift caused by overall longitudinal bending of the beam, localized transverse bending, and transverse eccentric loading.

[0023] 3. In the ultimate load-bearing state of the composite beam, when the bridge deck and the upper flange of the steel beam slip relative to each other, the connection structure between the lower embedded steel bars of the precast concrete bridge deck and the upper flange of the steel beam in the present invention can also serve as a shear connector, thereby increasing the ultimate load-bearing capacity and safety reserve of the composite beam;

[0024] 4. In the present invention, the lower embedded steel bars of the precast concrete bridge deck are connected to the upper flange plate of the steel beam by bolts, which has a fast construction speed and a high degree of industrialization, significantly reduces the workload of on-site steel bar welding at wet joints, improves the overall construction efficiency of the bridge, and is in line with the development direction of bridge construction technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the cross-sectional structure of the wet joint of the present invention;

[0026] Figure 2 This is a schematic plan view of the wet joint structure when the prefabricated bridge deck of the present invention is installed on the upper flange plate of the steel beam;

[0027] Figure 3 for Figure 2 Schematic cross-section of the embedded reinforcement of the precast bridge deck on the left side of the center;

[0028] Figure 4 for Figure 2 A cross-sectional diagram of the embedded reinforcement of the precast bridge deck on the middle right;

[0029] Figure 5 for Figure 1 Schematic diagram of the plane structure at the top surface of the upper flange plate of the steel beam.

[0030] List of Figure Symbols:

[0031] 1. Steel beam; 2. Upper flange plate of steel beam; 31. Precast bridge deck on the left; 32. Precast bridge deck on the right; 41. Lower embedded steel bars of the precast bridge deck on the left; 42. Lower embedded steel bars of the precast bridge deck on the right; 51. Upper embedded steel bars of the precast bridge deck on the left; 52. Upper embedded steel bars of the precast bridge deck on the right; 61. Rubber gasket on the left; 62. Rubber gasket on the right; 7. Bolts; 81. Upper nut A of the lower embedded steel bars of the precast bridge deck on the left; 82. Upper nut B of the lower embedded steel bars of the precast bridge deck on the right; 91. Lower nut A of the lower embedded steel bars of the precast bridge deck on the left; 92. Lower nut B of the lower embedded steel bars of the precast bridge deck on the right; 10. Steel bars along the direction of the wet joint; 11. Wet joint concrete. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0033] like Figure 1 As shown, the present invention provides a wet joint structure of a steel-concrete composite structure bridge, comprising a steel beam 1, a left precast bridge deck 31, a right precast bridge deck 32 and wet joint concrete 11, wherein the steel beam upper flange plate 2 is welded with a stud 7, a left rubber pad 61 is padded between the left precast bridge deck 31 and the steel beam upper flange plate 2, and a right rubber pad 62 is padded between the right precast bridge deck 32 and the steel beam upper flange plate 2, the rubber pad having the function of supporting the precast bridge deck and preventing leakage of mortar during pouring of wet joint concrete, the left precast bridge deck 31 is provided with an upper layer pre-embedded steel bar 51 and a lower layer pre-embedded steel bar 41 which are full-length and extend into the wet joint, and the right precast bridge deck 32 is provided with an upper layer pre-embedded steel bar 5 which is full-length and extends into the wet joint. 2 and the lower embedded steel bars 42, the embedded steel bars 51 and 52 corresponding to the precast bridge panels on the left and right sides, and 41 and 42 are staggered and adjacently arranged in the direction of the wet joint, the end of the lower embedded steel bar 41 of the left precast bridge panel 31 is bent downward and passes through the upper flange plate on the right side of the steel beam web and is fixedly connected to the upper flange plate 2 of the steel beam through the upper nut A81 and the lower nut A91, the end of the lower embedded steel bar 42 of the right precast bridge panel 32 is bent downward and passes through the upper flange plate on the left side of the steel beam web and is fixedly connected to the upper flange plate 2 of the steel beam through the upper nut B82 and the lower nut B92, the upper embedded steel bar 51 of the left precast bridge panel and the upper embedded steel bar 52 of the right precast bridge panel are welded together.

[0034] Furthermore, the downwardly bent sections at the ends of the embedded steel bars 41 and 42 in the lower layer of the prefabricated bridge deck are threaded for installing upper nuts and lower nuts.

[0035] Furthermore, the upper flange plate 2 of the steel beam is provided with bolt holes that match the embedded steel bars 41 and 42 of the lower layer of the prefabricated slab bridge deck.

[0036] Furthermore, a gasket is provided between the upper nut A81 and the lower nut A91 of the embedded steel bars 41 of the lower layer of the left prefabricated bridge deck and the upper flange plate 2 of the steel beam, and a gasket is provided between the upper nut B82 and the lower nut B92 of the embedded steel bars 42 of the lower layer of the right prefabricated bridge deck and the upper flange plate 2 of the steel beam.

[0037] Furthermore, steel bars 10 are provided in the wet joint along the direction of the wet joint.

[0038] The construction method of the wet joint of the prefabricated assembled steel-concrete composite structure bridge of the present invention comprises the following specific steps:

[0039] a. Precast concrete bridge decks 31 and 32 on both sides of the wet joints, and the lower layer of the precast bridge deck embedded with steel bars 41 and 42 have threaded ends at the downwardly bent sections;

[0040] b factory processing steel beam 1, the upper flange plate 2 of the steel beam 1 welded studs 7, and open the lower layer of the precast bridge deck embedded steel bars 41 and 42 matching the bolt holes;

[0041] c. Erect the steel beam 1 on site and install rubber pads 61 and 62 on both sides of the steel beam upper flange plate 2;

[0042] d. Install nuts A81 and B82 on the downwardly bent sections of the embedded steel bars 41 and 42 at the ends of the precast concrete bridge deck and screw them to the top;

[0043] e. On-site hoisting precast concrete bridge decks 31 and 32 in place, so that the lower embedded steel bars 41 and 42 are bent downwardly through the ends of the steel beam flange plate 2 corresponding bolt holes;

[0044] f. Screw the lower pre-embedded steel bars on the nut A81 and the upper nut B82 into place between the steel beam upper flange plate 2, install the lower pre-embedded steel bars on the lower nut A91 and the lower nut B92, and tighten it between the steel beam upper flange plate 2;

[0045] g. Welding the upper embedded steel bars 51 and 52 on the left and right sides of the precast bridge deck;

[0046] h. Install steel bars 10 along the wet joint direction and pour wet joint concrete 11.

[0047] The present invention provides a wet joint structure and construction method for a steel-concrete composite structure bridge, which solves the problems of difficulty in welding connection construction and difficulty in ensuring connection quality between the pre-embedded steel bars in the lower layer of prefabricated bridge decks in conventional wet joints due to the small operating space. It also has the functions of pull-out resistant connectors and shear resistant connectors, has a fast construction speed and a high degree of industrialization, significantly reduces the workload of on-site steel bar welding at wet joints, and improves the overall construction efficiency of the bridge.

[0048] It should be noted that the above content merely illustrates the technical idea of ​​the present invention and cannot be used to limit the scope of protection of the present invention. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications all fall within the scope of protection of the claims of the present invention.

Claims

1. A wet joint structure for a steel-concrete composite bridge, comprising a steel beam and a prefabricated bridge deck, characterized in that: The precast bridge deck is divided into a left precast bridge deck and a right precast bridge deck. There is a wet joint between the left precast bridge deck and the right precast bridge deck. Concrete is poured in the wet joint. Vertical studs are welded on the upper flange plate of the steel beam. The steel beam is arranged below the left precast bridge deck and the right precast bridge deck. Rubber pads are placed between the precast bridge deck and the upper flange plate of the steel beam. The left precast bridge deck and the right precast bridge deck are both provided with upper and lower layers of embedded steel bars extending into the wet joint. The precast steel bars corresponding to the left and right precast bridge decks are placed on the left and right precast bridge decks. The embedded steel bars are staggered and arranged adjacent to each other in the direction of the wet joint. The end of the lower layer of embedded steel bars of the left prefabricated bridge deck is bent downward and passes through the upper flange plate on the right side of the steel beam web and is fixedly connected to the upper flange plate of the steel beam through upper and lower nuts A. The end of the lower layer of embedded steel bars of the right prefabricated bridge deck is bent downward and passes through the upper flange plate on the left side of the steel beam web and is fixedly connected to the upper flange plate of the steel beam through upper and lower nuts B. The upper embedded steel bars of the left prefabricated bridge deck and the right prefabricated bridge deck are welded together.

2. The wet joint structure of a steel-concrete composite bridge according to claim 1, characterized in that: The downwardly bent section of the end portion of the embedded steel bar in the lower layer of the prefabricated bridge deck is threaded.

3. The wet joint structure of a steel-concrete composite bridge according to claim 1, characterized in that: The upper flange of the steel beam is provided with bolt holes that match the embedded steel bars in the lower layer of the prefabricated slab bridge deck.

4. The wet joint structure of a steel-concrete composite bridge according to claim 1, characterized in that: Gaskets are provided between the upper and lower nuts of the embedded steel bars in the lower layer of the prefabricated bridge deck and the upper flange plate of the steel beam.

5. The wet joint structure of a steel-concrete composite bridge according to claim 1, characterized in that: The wet joint is provided with steel bars along the wet joint direction.

6. The construction method of a wet joint structure of a steel-concrete composite bridge according to claim 1, characterized in that: The specific steps are as follows: a. Precast concrete bridge deck; b. The steel beams are processed and manufactured in the factory. Vertical studs are welded on the upper flange plates of the steel beams, and bolt holes are opened to match the embedded steel bars in the lower layer of the precast slab bridge deck; c. Erect steel beams on site and install rubber pads on the upper flange plates of the steel beams; d. Install nuts on the downward-bent end of the embedded steel bars in the lower layer of the precast concrete bridge deck and tighten them to the top; e. Hoist the precast concrete bridge deck into place on site, so that the downwardly bent end of the embedded steel bars in the lower layer passes through the corresponding bolt holes on the upper flange plate of the steel beam; f. Tighten the upper nuts of the lower pre-embedded steel bars to the upper flange plate of the steel beam, install the lower nuts of the lower pre-embedded steel bars, and tighten them to the upper flange plate of the steel beam; g. Weld the upper embedded steel bars of the prefabricated bridge panels on the left and right sides.

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