Construction method for 0 # block in tower beam consolidation area of high tower cable-stayed bridge

Abstract

The invention relates to a high tower cable-stayed bridge tower beam consolidation area 0 # block construction method, which comprises the following steps of: after construction of a bridge tower bottom section is completed, erecting a short bracket on a bridge tower bearing platform around the tower bottom, and prefabricating a tower beam consolidation area 0 # block on the short bracket; the construction of the bridge tower is continued while the 0 # block is prefabricated, after the bridge tower is constructed to the previous section of a tower beam consolidation area, a lifting system is arranged on the tower top, the 0 # block is lifted to the designed height of a main beam through the lifting system, the 0 # block is connected with a wet joint steel bar connector of the bridge tower, then a wet joint bottom formwork is lifted through the lifting system, and wet joint concrete between the bridge tower and the 0 # block is poured. And 0 # block installation construction is completed. A high support does not need to be erected, the construction safety is high, and the cost is low; the 0 # block can be synchronously constructed with the bridge tower, and the construction efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of bridge construction, relates to a cable-stayed bridge construction, and specifically relates to a construction method for a 0# block in a tower-beam consolidation zone of a high-tower cable-stayed bridge. Background Art

[0002] The cable-stayed bridge consists of a bridge tower and a main beam. The bridge tower and the main beam are connected by multiple cable stays. In the consolidation area between the main beam and the bridge tower, the main beam 0# block and the bridge tower are cast as one. Figure 1 As shown, the main beam 0# block 1, on the one hand, realizes the consolidation of the main beam and the bridge tower 2, and transfers the main beam load to the bridge tower. On the other hand, it is convenient to cast the main beam cantilever from both ends of the 0# block toward the side span direction to achieve the connection with the side span. Therefore, the construction of the main beam 0# block is a key link in the construction of the cable-stayed bridge.

[0003] Conventional 0# block construction methods include: when the bridge tower is constructed to the main beam design elevation, first cast the 0# block, and then continue to cast the bridge tower upwards; the other method is to cast the 0# block after all the bridge towers are constructed. In either case, a support needs to be set up under the 0# block. When the bridge is high or crosses a deep canyon, the bridge tower is high, and the height of the support required is also high. Setting up high supports not only takes a long time, requires a large amount of materials, and has low construction efficiency, but also requires high bearing capacity of the foundation and high risks of high-altitude operations. Summary of the invention

[0004] The purpose of the present invention is to solve the above problems and provide a construction method for the 0# block in the tower-beam consolidation zone of a high-tower cable-stayed bridge with high construction efficiency, good safety and low cost.

[0005] The technical solution of the present invention is as follows:

[0006] A construction method for a 0# block in a tower-beam consolidation zone of a high-tower cable-stayed bridge, characterized in that it comprises the following steps:

[0007] (1) After the construction of the bottom segment of the bridge tower is completed, a low support is set up on the bridge tower cap around the bottom of the tower, and the 0# block of the tower beam consolidation area is prefabricated on the low support; a reserved hole larger than the cross section of the bridge tower is set in the middle of the 0# block, and wet joint steel bar joints are set around the inner wall of the reserved hole;

[0008] (2) While prefabricating the 0# block, continue the construction of the bridge tower, and reserve wet joint steel bar joints around the tower-beam consolidation area of ​​the tower body; after the bridge tower is constructed to the upper section of the tower-beam consolidation area, set up a lifting system at the top of the tower;

[0009] (3) After the prefabricated 0# block reaches the design strength, the lifting system lowers the hoisting device and lifts the 0# block to the design height of the main beam; the 0# block is connected to the wet joint steel bar joint of the bridge tower; the lifting system maintains the lifting state of the 0# block;

[0010] (4) Remove the low support at the bottom of the tower, set up a wet joint bottom formwork hanger at the bottom of the tower, and lift the wet joint bottom formwork to the bottom of the 0# block through the lifting system;

[0011] (5) Pour wet joint concrete between the bridge tower and the 0# block to complete the installation of the 0# block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) High safety. No need to set up high scaffolding, which can reduce the amount of high-altitude work and the risk of high-altitude work.

[0014] (2) Good economic benefits. The 0# block is prefabricated on the low support at the bottom of the tower, which significantly reduces the input of temporary structural materials and can greatly reduce construction costs.

[0015] (3) High construction efficiency. The 0# block is prefabricated at the bottom of the tower and can be constructed simultaneously with the main tower, which is conducive to shortening the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the tower-beam consolidation zone of a cable-stayed bridge;

[0017] Figure 2 It is a construction flow chart of the present invention;

[0018] Figure 3 This is a schematic diagram of the state of prefabricating 0# blocks on the low support at the bottom of the tower;

[0019] Figure 4 This is a schematic diagram of the plan structure of the prefabricated 0# block;

[0020] Figure 5 It is a schematic diagram of the structure of the tower top lifting system in the side view of the transverse bridge;

[0021] Figure 6 This is a schematic diagram of the structure of the tower top lifting system viewed from the side along the bridge;

[0022] Figure 7 This is a side view of the cross bridge where the 0# block is installed through the tower top lifting system;

[0023] Figure 8 This is a side view of the cross bridge where the 0# block is installed through the tower top lifting system. DETAILED DESCRIPTION

[0024] Figure 2 It is the construction flow chart of the present invention, and the specific construction method is as follows:

[0025] (1) Figure 3 , Figure 4As shown, after the construction of the bottom segment of the bridge tower 2 is completed, a low bracket 4 is set up on the bridge tower pedestal 3 around the bottom of the tower, and the tower beam consolidation area 0# block 1 is prefabricated on the low bracket 4; a reserved hole 5 larger than the cross-section of the bridge tower is set in the middle of the 0# block 1, and the bridge tower 2 is located in the reserved hole 5. A certain distance is set around the inner wall of the reserved hole 5 and the bridge tower 2, which serves as a wet joint connecting the 0# block and the bridge tower; wet joint steel bar joints are set around the inner wall of the reserved hole.

[0026] (2) Figure 5 , Figure 6 As shown, while prefabricating block 0#, the construction of bridge tower 2 continues. When the construction reaches the tower-beam consolidation area 21, wet joint steel bar joints are reserved around the tower-beam consolidation area; after the bridge tower is constructed to the upper section of the tower-beam consolidation area 21, a lifting system is set at the top of the tower.

[0027] The lifting system includes a lifting truss and a hydraulic lifting station; the lifting truss 6 is fixed on the top of the tower, and includes three longitudinal truss plates arranged along the bridge direction, and the longitudinal truss plates are fixedly connected by multiple transverse truss plates arranged in the transverse direction of the bridge; the hydraulic lifting station includes a 0# block jack 7 and a bottom mold jack 8, the 0# block jack 7 is used to lift the prefabricated 0# block, and one jack is respectively arranged at both ends of the top of each longitudinal truss plate, and the bottom mold jack 8 is used to lift the wet joint bottom mold, and multiple jacks are arranged on the truss beam according to the installation position of the wet joint bottom mold.

[0028] (3) Figure 7 , Figure 8 As shown, after the prefabricated 0# block reaches the design strength, the 0# block jack 7 of the lifting system lowers the hoisting device to lift the 0# block 1 to the design height of the main beam; the 0# block is connected to the wet joint steel bar joint of the bridge tower; the lifting system maintains the lifting state of the 0# block.

[0029] (4) Remove the low support at the bottom of the tower, set up a wet joint bottom formwork hanger at the bottom of the tower, and lift the wet joint bottom formwork 9 to the bottom of the 0# block through the bottom formwork jack of the lifting system.

[0030] (5) Pour the wet joint concrete between the bridge tower and the 0# block to complete the installation of the 0# block.

[0031] Remove the tower top lifting system and continue to construct the bridge tower upwards to the designed height.

Claims

1. A construction method for the 0# block in the tower-beam consolidation zone of a high-tower cable-stayed bridge, characterized in that: The following steps are involved: (1) After the construction of the bottom segment of the bridge tower is completed, a low support is set up on the bridge tower cap around the bottom of the tower, and the 0# block of the tower beam consolidation area is prefabricated on the low support; a reserved hole larger than the cross section of the bridge tower is set in the middle of the 0# block, and wet joint steel bar joints are set around the inner wall of the reserved hole; (2) While prefabricating the 0# block, continue the construction of the bridge tower, and reserve wet joint steel bar joints around the tower-beam consolidation area of ​​the tower body; after the bridge tower is constructed to the upper section of the tower-beam consolidation area, set up a lifting system at the top of the tower; (3) After the prefabricated 0# block reaches the design strength, the lifting system lowers the hoisting device and lifts the 0# block to the design height of the main beam; the 0# block is connected to the wet joint steel bar joint of the bridge tower; the lifting system maintains the lifting state of the 0# block; (4) Remove the low support at the bottom of the tower, set up a wet joint bottom formwork hanger at the bottom of the tower, and lift the wet joint bottom formwork to the bottom of the 0# block through the lifting system; (5) Pour wet joint concrete between the bridge tower and the 0# block to complete the installation of the 0# block.

2. The construction method of block 0# in the tower-beam consolidation zone of a high-tower cable-stayed bridge according to claim 1 is characterized in that: The lifting system includes a lifting truss and a hydraulic lifting station; the lifting truss is fixed on the top of the tower, and includes three longitudinal truss plates arranged in the direction of the bridge, and the longitudinal truss plates are fixedly connected by multiple transverse truss plates arranged in the direction of the bridge; the hydraulic lifting station includes a 0# block jack and a bottom mold jack, the 0# block jack is used to lift the 0# block, and one jack is respectively arranged at both ends of the top of each longitudinal truss plate, and the bottom mold jack is used to lift the wet joint bottom mold, and multiple jacks are arranged on the truss beam according to the installation position of the wet joint bottom mold.

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