Steel-concrete composite bridge joint connecting structure and bridge

Abstract

The utility model relates to steel - mix combined bridge joint connecting structure and bridge, the connecting structure prefabricated bridge deck and steel roof, the prefabricated bridge deck places on the steel roof, forms the horizontal wet joint and longitudinal wet joint between two adjacent prefabricated bridge decks, the prefabricated bridge deck is located longitudinal wet joint one side and is equipped with the convex structure, makes longitudinal wet joint both sides form the chamfer structure. The utility model discloses through the prefabricated bridge deck sets up the protruding structure at longitudinal wet joint, makes longitudinal wet joint place chamfer high, effectively reduces the production of steel mix combined beam joint disease.

Description

Technical Field

[0001] This utility model specifically relates to a joint connection structure for steel-concrete composite bridges and the bridge itself. Background Technology

[0002] Steel-concrete composite bridges are a type of high-performance bridge structure. Compared to reinforced concrete beams, they reduce structural weight, decrease seismic loads, reduce cross-sectional dimensions, increase usable space, save on formwork and installation, shorten construction time, and increase beam ductility. Compared to steel beams, they reduce steel consumption, increase stiffness, enhance stability and overall integrity, and improve fire resistance and durability. Combining the advantages of both steel and concrete structures, they represent one of the main development directions for future structural systems.

[0003] Steel-concrete composite bridges incorporate the concept of "breaking down the whole into parts and then integrating them into a whole," decomposing the bridge structure into individual prefabricated units in factories. These prefabricated units are then transported to the bridge site and assembled. The characteristics of steel-concrete composite bridges make them suitable not only for open, flat plains but also for rugged mountainous and canyonous terrain. While the quality of the factory-prefabricated units within the composite beam is well-assured, the assembly of these units is affected by uncertainties such as weather, construction conditions, and the skill level of the workers, making it difficult to guarantee construction quality. Furthermore, the assembly of these units is a crucial factor determining the bridge's construction schedule. Ensuring high-quality and rapid construction of the assembled structure of steel-concrete composite bridges is a highly significant engineering undertaking.

[0004] Wet joints are a critical structural element in connecting precast bridge decks, and they are also the areas most prone to quality problems and cracking. Based on currently operational steel-concrete composite bridges, cracking, water seepage, and aging at wet joints are very common phenomena. Utility Model Content

[0005] The primary objective of this invention is to overcome the shortcomings of existing technologies and provide a simple, stable, and reliable steel-concrete composite bridge joint connection structure.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A steel-concrete composite bridge joint connection structure includes precast bridge decks and steel beams. The precast bridge decks are placed on the steel beams, and a transverse wet joint and a longitudinal wet joint are formed between two adjacent precast bridge decks. The precast bridge decks have a protruding structure on one side of the longitudinal wet joint, so that the two sides of the longitudinal wet joint form a chamfered structure.

[0008] In a preferred embodiment, the cross-section of the protruding structure is a right-angled trapezoid.

[0009] In one preferred embodiment, the precast bridge deck is placed longitudinally on the steel beam.

[0010] As a preferred embodiment, the edge of the precast bridge deck on the longitudinal wet joint side is provided with toothed protrusions to enhance the integrity of the bridge deck.

[0011] In a preferred embodiment, the precast bridge deck is made of concrete with a compressive strength greater than 80 MPa, a creep coefficient of 0.2 to 0.3, an axial compressive strength greater than 7 MPa, and an ultimate tensile strength greater than 5 MPa.

[0012] In a preferred embodiment, the reinforcing bars at the joints of the transverse wet joint and the longitudinal wet joint are connected by steel sleeves to increase the joint strength.

[0013] In a preferred embodiment, the longitudinal wet joint is located at the top of the steel main beam.

[0014] In a preferred embodiment, the transverse wet joint is set on a pre-embedded steel plate. The main steel beam is a longitudinal I-beam, and the longitudinal wet joint is laid on the main steel beam. The wet joint can be cast using the main steel beam as a template, while the transverse wet joint is cast using a precast steel plate as the bottom template.

[0015] The second objective of this utility model is to provide a steel-concrete composite bridge, which includes the aforementioned joint connection structure.

[0016] In a preferred embodiment, a single precast bridge deck panel spans the transition pier at the mid-support of the bridge, ensuring that the mid-support of the bridge lies within the panel section of the precast bridge deck panel. This arrangement allows the transverse joints to avoid negative bending moment peaks, reducing stress at the transverse joints in the first system.

[0017] This utility model has the following beneficial effects:

[0018] (1) By setting a protruding structure at the longitudinal wet joint of the precast bridge deck, the chamfer at the longitudinal wet joint becomes higher, reducing the stress at the joint under the action of the wheels, and effectively reducing the occurrence of joint defects in steel-concrete composite beams.

[0019] (2) The precast bridge deck is made of high-performance concrete and has a toothed structure on both sides to enhance the overall integrity of the bridge deck;

[0020] (3) The steel reinforcement at the joints of the precast bridge deck is connected with steel sleeves to increase the joint strength;

[0021] (4) The continuous beam design concept is adopted, with no prestress and no drop beam. The bridge deck is under tension near the middle support, and its stress form is different from the commonly used cable-stayed system and large-span continuous box girder system. The connection structure fully utilizes the high performance of the bridge deck structure and does not have longitudinal prestress, which is conducive to reducing the thickness of the bridge deck. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the bridge deck with the joint connection structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the cross-section of the bridge deck of the joint connection structure of this utility model; the upper figure is the rectangular cross-section before optimization, and the lower figure is the cross-section after setting the protruding structure.

[0024] Figure 3 This is a schematic diagram of the longitudinal wet joint connection of the bridge deck of the joint connection structure of this utility model.

[0025] Figure 4 yes Figure 3 Schematic diagram of the AA section.

[0026] Figure 5 This is a schematic diagram of the transverse wet joint connection of a bridge deck panel in a utility model joint connection structure.

[0027] Figure 6 yes Figure 5 Schematic diagram of the AA section.

[0028] Figure 7 This is a schematic diagram of a wet joint connection at the end slot of a bridge deck beam in a utility model joint connection structure.

[0029] Figure 8 yes Figure 7 Schematic diagram of the AA section.

[0030] In the diagram, 1 is the expansion joint, 2 is the pier centerline, 3 is the precast bridge deck, 4 is the transverse wet joint, 5 is the longitudinal wet joint; 6 is the embedded steel bar; 7 is the embedded sleeve; 8 is the steel sleeve; 9 is the steel main beam; 10 is the transverse steel bar of the precast slab (steel bar lap splice); 11 is the embedded steel plate; 12 is the expansion joint interface; 13 is the toothed protrusion; 14 is the protruding structure; and 15 is the end crossbeam. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1

[0033] This embodiment specifically illustrates the steel-concrete composite bridge joint connection structure of this utility model, such as... Figure 1 As shown, it includes a precast bridge deck 3 and a steel beam. The precast bridge deck 3 is placed longitudinally on the steel beam. A transverse wet joint 4 and a longitudinal wet joint 5 are formed between two adjacent precast bridge decks 3. The edge of the longitudinal wet joint side of the precast bridge deck 3 is provided with a toothed protrusion 13.

[0034] like Figure 2 As shown, the precast bridge deck 3 has a raised structure 14 on one side of the longitudinal wet joint 5, which forms a chamfered structure on both sides of the longitudinal wet joint 5, as shown. Figure 4 As shown, the cross-section of the protruding structure 14 is a right trapezoid.

[0035] The wet joint structure in this embodiment includes two types of sleeve structures: one is a pre-embedded sleeve 7 embedded in the precast bridge deck 3, and the other is a steel sleeve 8 installed in the wet joint, such as... Figure 3 , 4 As shown in Figures 5 and 6, the reinforcing bars at the joints of the transverse wet joint 4 and the longitudinal wet joint 5 are connected using steel sleeves 8. There are slots at both ends of the bridge for installing expansion joints 1, and these slots form the transverse wet joints 4.

[0036] Longitudinal wet joint 5 is arranged on the top of steel main beam 9, transverse wet joint 4 is set on embedded steel plate 11, and end crossbeam 14 is below the wet joint at the groove. Steel main beam 9 is the main load-bearing structure in steel beam, and end crossbeam 14 is a steel beam set at the end.

[0037] In this embodiment, the precast bridge deck uses high-performance concrete with steel fiber incorporated (volume content 2.0%~3.5%), compressive strength greater than 80MPa, creep coefficient 0.2~0.3, axial compressive strength greater than 7MPa, and ultimate tensile strength greater than 5MPa.

[0038] Example 2

[0039] This embodiment provides a steel-concrete composite bridge using the connection structure shown in Embodiment 1. At the mid-support point of the bridge, a precast bridge panel 3 is installed as a whole span at the transition pier, so that the mid-support point of the bridge is located within the panel section of the precast bridge panel 3.

[0040] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.

Claims

1. A steel-concrete composite bridge joint connection structure, comprising precast bridge decks (3) and steel beams, wherein the precast bridge decks (3) are placed on the steel beams, and a transverse wet joint (4) and a longitudinal wet joint (5) are formed between adjacent precast bridge decks (3), characterized in that, The precast bridge deck (3) has a raised structure (14) on one side of the longitudinal wet joint (5), so that the two sides of the longitudinal wet joint (5) form a chamfered structure.

2. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The cross-section of the protruding structure (14) is a right trapezoid.

3. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The precast bridge deck (3) is placed longitudinally on the steel beam.

4. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The edge of the precast bridge deck (3) on the longitudinal wet joint side is provided with toothed protrusions (13).

5. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The precast bridge deck (3) is made of concrete with a compressive strength greater than 80MPa, a creep coefficient of 0.2~0.3, an axial compressive strength greater than 7MPa, and an ultimate tensile strength greater than 5MPa.

6. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The reinforcing bars at the joints of the transverse wet joint (4) and the longitudinal wet joint (5) are connected by steel sleeves (8).

7. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The longitudinal wet joint (5) is located at the top of the steel main beam (9).

8. The steel-concrete composite bridge joint connection structure according to claim 1, characterized in that, The transverse wet joint (4) is set on the embedded steel plate (11).

9. A steel-concrete composite bridge, characterized in that, The steel-concrete composite bridge includes the joint connection structure as described in any one of claims 1 to 8.

10. The steel-concrete composite bridge according to claim 9, characterized in that, A precast bridge panel (3) is installed across the transition pier at the mid-support point of the bridge, so that the mid-support point of the bridge is located within the panel section of the precast bridge panel (3).

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