Steel-concrete combined arch support of continuous beam-arch combined bridge

Abstract

This utility model proposes a steel-concrete composite arch seat for a continuous beam-arch bridge, belonging to the field of bridge engineering technology. It solves the problems of large single-construction height, difficult construction control, and unreliable concrete pouring quality in existing steel-concrete composite arch seats. The steel-concrete composite arch seat includes a lower half of reinforced concrete fixed to block 0 of the continuous beam and an upper half of reinforced concrete fixed to the lower half. The lower half of the reinforced concrete is surrounded by a lower half of external steel structure, and the upper half of the reinforced concrete is surrounded by an upper half of external steel structure. The upper and lower half of the external steel structure are rigidly connected. By adjusting the traditional reinforced concrete arch seat to a steel-concrete composite arch seat with an external steel structure and adopting layered pouring, the single concrete pouring height and volume can be effectively reduced, avoiding the problem of displacement of the first section of the main arch steel structure during concrete pouring.

Description

Technical Field

[0001] This utility model belongs to the field of bridge engineering technology and relates to a steel-concrete composite arch seat for a continuous beam-arch composite bridge. Background Technology

[0002] The structure of a continuous beam-arch composite bridge is as follows: Figure 1 As shown, the main beam adopts a prestressed concrete structure, and the main arch adopts a steel-concrete composite structure. By organically combining the two structural systems of long-span continuous beam and arch, it has advantages such as strong span capacity, good economy, high structural stiffness, and strong wind and earthquake resistance, and is being promoted and applied in more and more bridges. Continuous beam-arch composite bridges mostly cross rivers or valleys, and often adopt the construction method of beam first and arch later. The main beam is constructed by cantilever casting, and the main arch is constructed using methods such as in-situ support assembly, vertical rotation, and off-site assembly + longitudinal movement.

[0003] like Figure 2 As shown, continuous beam-arch composite bridges connect the continuous beam and arch as a whole by setting a reinforced concrete arch abutment at the top of the continuous beam. The first section of the main arch steel structure extends into the arch abutment and is welded to the rest of the main arch steel structure. To ensure a reliable connection between the continuous beam and the main arch, the arch abutment and the first section of the main arch steel structure must be poured simultaneously with the No. 0 block (first section of concrete) of the continuous beam. Continuous beam-arch composite bridges generally have a span greater than 160m, and the height of the No. 0 block of the continuous beam exceeds 11m. Considering the height of the arch abutment, the height of a single concrete pour exceeds 16m, and a large number of temporary members are required to ensure a reliable connection between the first section of the main arch steel structure and the arch abutment and the No. 0 block of the continuous beam during construction. This presents problems such as high single concrete pouring height, large pouring volume, easy displacement of the first section of the steel structure during concrete pouring, difficulty in construction control, and difficulty in ensuring concrete pouring quality. After the construction of many similar bridges, due to complex stress and poor construction results, cracks easily appear in the arch abutment concrete after the bridge is opened to traffic, resulting in difficult and costly repairs with poor repair results.

[0004] Since the center of the main arch is aligned with the transverse center of the arch seat, for bridges using the off-site assembly + longitudinal movement construction method for the main arch, the height of the arch transport trolley should not be less than the height of the arch seat in order to ensure that the main arch moves smoothly through the arch seat. Therefore, this type of continuous beam-arch composite bridge still has the problem of the arch transport trolley being too high. Utility Model Content

[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a steel-concrete composite arch seat for a continuous beam-arch composite bridge with good durability.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] The steel-concrete composite arch abutment of the continuous beam-arch composite bridge includes a lower half of reinforced concrete fixed on block 0 of the continuous beam and an upper half of reinforced concrete fixed on the lower half of reinforced concrete. The lower half of reinforced concrete is surrounded by a lower half of outer steel structure, and the upper half of reinforced concrete is surrounded by an upper half of outer steel structure. The upper half of outer steel structure is fixedly connected to the lower half of outer steel structure.

[0008] In the steel-concrete composite arch abutment of the aforementioned continuous beam-arch composite bridge, the upper part of the lower half of the reinforced concrete has several upwardly protruding tooth-like portions, and the lower part of the upper half of the reinforced concrete has matching recesses adapted to the tooth-like portions. The tooth-like portions enhance the transverse shear resistance of the contact surface between the lower and upper half of the reinforced concrete.

[0009] In the steel-concrete composite arch abutment of the aforementioned continuous beam-arch composite bridge, shear studs are provided on the inner surfaces of both the lower half of the outer steel structure and the upper half of the outer steel structure. The shear studs located on the inner surface of the upper half of the outer steel structure extend into the upper half of the reinforced concrete, and the shear studs located on the inner surface of the lower half of the outer steel structure extend into the lower half of the reinforced concrete.

[0010] Shear studs connect the lower half of the outer steel structure to the lower half of the reinforced concrete structure as a whole, and at the same time connect the upper half of the outer steel structure to the upper half of the reinforced concrete structure as a whole.

[0011] In the steel-concrete composite arch abutment of the aforementioned continuous beam-arch composite bridge, stiffening ribs are provided on the inner surfaces of both the lower half of the outer steel structure and the upper half of the outer steel structure.

[0012] In the steel-concrete composite arch abutment of the aforementioned continuous beam-arch composite bridge, tie rods are provided between opposite sides of the lower half of the outer steel structure, and tie rods are also provided between opposite sides of the upper half of the outer steel structure. The stiffening ribs and tie rods ensure the stability of the upper and lower half of the outer steel structure during construction.

[0013] In the steel-concrete composite arch abutment of the aforementioned continuous beam-arch composite bridge, the upper part of the lower half of the outer steel structure is higher than the upper part of the lower half of the reinforced concrete.

[0014] In the steel-concrete composite arch seat of the aforementioned continuous beam-arch composite bridge, the lower half of the outer steel structure is fixedly connected to block 0 of the continuous beam.

[0015] The construction method for steel-concrete composite arch abutments includes the following steps:

[0016] Step S1: Tie the reinforcing bars of the continuous beam No. 0 block to the lower half of the reinforced concrete from bottom to top;

[0017] Step S2: Install the lower half of the outer steel structure and install tie rods;

[0018] Step S3: Install the formwork for the lower half of the reinforced concrete groove;

[0019] Step S4: Pour concrete for the 0th block and the lower half of the reinforced concrete of the continuous beam;

[0020] Step S5: Position and install the first section of the main arch steel structure;

[0021] Step S6: Position and install the upper half of the outer steel structure, and install the tie rods;

[0022] Step S7: Pour the concrete for the upper section of reinforced concrete;

[0023] Step S8: Apply a coating to the outer surface of the steel-concrete composite arch seat.

[0024] In the above-mentioned construction method of steel-concrete composite arch, steel bar joints are pre-embedded on the surface of the concrete poured in step S4.

[0025] In the above-mentioned construction method of steel-concrete composite arch, the upper half of the outer steel structure and the lower half of the outer steel structure are fused and welded together in step S6.

[0026] In the above-mentioned construction method of steel-concrete composite arch, the shear studs and stiffening ribs are constructed in the factory together with the lower half of the external steel structure / the upper half of the external steel structure.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] By replacing the traditional reinforced concrete arch abutment with a steel-concrete composite arch abutment with an external steel structure and adopting layered pouring, the height and volume of each concrete pour can be effectively reduced. This avoids the problem of displacement of the first section of the main arch steel structure during concrete pouring, reduces the height of the arch transport trolley in the "displaced assembly + longitudinal movement" construction method of the main arch, greatly reduces the difficulty of construction control, improves construction quality, and at the same time avoids cracks in the concrete arch abutment under complex stress conditions, thus improving the durability of the structure. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of a continuous beam-arch composite bridge in the background art.

[0030] Figure 2 This is a schematic diagram of the structure of a concrete arch seat in the background art.

[0031] Figure 3 This is a schematic diagram of the layered concrete construction of the steel-concrete composite arch seat.

[0032] Figure 4 This is a schematic diagram of the outer steel structure of the steel-concrete composite arch.

[0033] Figure 5This is a schematic diagram of the inner surface of the outer steel structure of the steel-concrete composite arch seat.

[0034] In the diagram, 1. Continuous beam block 0; 2. Lower half reinforced concrete; 3. Upper half reinforced concrete; 4. Lower half external steel structure; 5. Upper half external steel structure; 6. Shear studs; 7. Stiffening ribs; 8. Tie rods; 9. Main arch first section steel structure. Detailed Implementation

[0035] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0036] like Figure 3 The steel-concrete composite arch abutment of the continuous beam-arch bridge shown includes a lower half of reinforced concrete 2 fixed to block 1 of the continuous beam and an upper half of reinforced concrete 3 fixed to the lower half of reinforced concrete 2. The upper part of the lower half of reinforced concrete 2 has several upwardly protruding tooth-like parts, and the lower part of the upper half of reinforced concrete 3 has a matching cavity adapted to the tooth-like parts, which enhances the transverse shear resistance of the contact surface between the lower half of reinforced concrete 2 and the upper half of reinforced concrete 3. The height of the lower half of reinforced concrete 2 is approximately 80 cm.

[0037] like Figure 4 As shown, the lower half of the reinforced concrete 2 is surrounded by a lower half of the outer steel structure 4. In this embodiment, the lower half of the outer steel structure 4 is fixedly connected to the continuous beam block 0 1, and the lower half of the outer steel structure 4 is 20cm higher than the upper part of the lower half of the reinforced concrete 2.

[0038] like Figure 5 As shown, shear studs 6 are provided on the inner surface of the lower half of the outer steel structure 4. The shear studs 6 extend into the lower half of the reinforced concrete 2. Stiffening ribs 7 are also provided on the inner surface of the lower half of the outer steel structure 4. The stiffening ribs 7 extend vertically, and tie rods 8 are provided between opposite sides of the lower half of the outer steel structure 4.

[0039] The shear studs 6 and stiffening ribs 7 on the inner surface of the lower half of the outer steel structure 4 are installed together with the lower half of the outer steel structure 4 in the factory. The stiffening ribs 7 and tie rods 8 ensure the stability of the lower half of the outer steel structure 4 during construction. The shear studs 6 connect the lower half of the outer steel structure 4 to the lower half of the reinforced concrete 2 as a whole.

[0040] like Figure 4 As shown, the upper half of the reinforced concrete 3 is surrounded by an upper half of outer steel structure 5. In this embodiment, the upper half of the outer steel structure 5 is welded to the lower half of the outer steel structure.

[0041] like Figure 5As shown, the inner surface of the upper half of the outer steel structure 5 is provided with shear studs 6. The shear studs 6 extend into the upper half of the reinforced concrete 3, and the shear studs 6 connect the upper half of the outer steel structure 5 and the upper half of the reinforced concrete 3 into a whole. Figure 5 As shown, the inner surface of the upper half of the outer steel structure 5 is also provided with stiffening ribs 7, which are integrated with the stiffening ribs 7 of the lower half of the outer steel structure 4. Figure 5 As shown, tie rods 8 are provided between opposite sides of the upper half of the outer steel structure 5.

[0042] The shear studs 6 and stiffening ribs 7 on the inner surface of the upper steel cladding 5 are installed together with the upper steel cladding 5 in the factory. The stiffening ribs 7 and tie rods 8 ensure the stability of the upper steel cladding 5 during construction. The shear studs 6 connect the upper steel cladding 5 to the upper reinforced concrete 3 as a whole.

[0043] The construction method for the above-mentioned steel-concrete composite arch abutment includes the following steps:

[0044] Step S1: Tie the reinforcing bars of continuous beam block 01 and the lower half of reinforced concrete 2 from bottom to top;

[0045] Step S2: Install the lower half of the outer steel structure 4 and install the tie rods 8;

[0046] Step S3: Install the formwork for the groove of the lower half of the reinforced concrete 2;

[0047] Step S4: Pour concrete for block 0 of the continuous beam and the lower half of the reinforced concrete 2, and pre-embed steel bar joints on the surface of the poured concrete.

[0048] Step S5: Position and install the first section of the main arch steel structure 9; after installation, the first section of the main arch steel structure 9 rests against the lower half of the reinforced concrete 2;

[0049] Step S6: Tie the reinforcing bars of the upper half of the reinforced concrete 3, position and install the upper half of the outer steel structure 5, make the upper half of the outer steel structure 5 and the lower half of the outer steel structure 4 fully welded together, and install the tie rod 8.

[0050] Step S7: Pour concrete for the upper half of reinforced concrete 3;

[0051] Step S8: Apply a coating to the outer surface of the steel-concrete composite arch seat, such as by spraying paint.

[0052] By replacing the traditional reinforced concrete arch seat with a steel-concrete composite arch seat with an external steel structure and adopting layered pouring, the height of a single concrete pour can be effectively reduced. In this embodiment, the concrete pouring height can be reduced by 5m, reducing the volume of a single concrete pour. This avoids the problem of easy displacement of the first section of the main arch steel structure 9 during the concrete pouring process, reduces the height of the arch transport trolley in the "displaced assembly + longitudinal movement" construction method of the main arch, greatly reduces the difficulty of construction control, improves construction quality, and at the same time avoids cracks in the concrete arch seat under complex stress conditions, thus improving the durability of the structure.

[0053] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A steel-concrete composite arch abutment for a continuous beam-arch composite bridge, characterized in that, It includes a lower half reinforced concrete section (2) fixed on block 0 (1) of the continuous beam and an upper half reinforced concrete section (3) fixed on the lower half reinforced concrete section (2). The lower half reinforced concrete section (2) is surrounded by a lower half outer steel structure (4), and the upper half reinforced concrete section (3) is surrounded by an upper half outer steel structure (5). The upper half outer steel structure (5) and the lower half outer steel structure (4) are fixedly connected.

2. The steel-concrete composite arch abutment of the continuous beam-arch composite bridge according to claim 1, characterized in that, The upper part of the lower half reinforced concrete (2) has several upwardly protruding tooth-like parts, and the lower part of the upper half reinforced concrete (3) has a matching cavity that is adapted to the tooth-like parts.

3. The steel-concrete composite arch abutment of the continuous beam-arch composite bridge according to claim 1, characterized in that, Shear studs (6) are provided on the inner surfaces of both the lower half of the outer steel structure (4) and the upper half of the outer steel structure (5). The shear studs (6) on the inner surface of the upper half of the outer steel structure (5) extend into the upper half of the reinforced concrete (3), and the shear studs (6) on the inner surface of the lower half of the outer steel structure (4) extend into the lower half of the reinforced concrete (2).

4. The steel-concrete composite arch abutment of the continuous beam-arch composite bridge according to claim 1, characterized in that, The inner surfaces of both the lower half of the outer steel structure (4) and the upper half of the outer steel structure (5) are provided with stiffening ribs (7).

5. The steel-concrete composite arch abutment of the continuous beam-arch composite bridge according to claim 1, characterized in that, Tie rods (8) are provided between opposite sides of the lower half of the outer steel structure (4), and tie rods (8) are also provided between opposite sides of the upper half of the outer steel structure (5).

6. The steel-concrete composite arch abutment of the continuous beam-arch composite bridge according to claim 1, characterized in that, The upper part of the lower half of the outer steel structure (4) is higher than the upper part of the lower half of the reinforced concrete (2).

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