Cooperative stress-bearing structure and method of hanging basket and bracket in the construction of cast-in-place section of integral box girder side span

Abstract

This invention discloses a method for coordinated force sharing between a hanging basket and a bracket during the construction of a cast-in-place section of an integral box girder. The method involves using the bottom beams of the bracket and the hanging basket as the erection platform for the cast-in-place section support. When the bottom beams of the bracket and the hanging basket overlap, a force adjustment device is installed between the bottom beams of the hanging basket and the bracket to enable coordinated force sharing between the hanging basket and the bracket, better distributing the load, ensuring uniform stress distribution throughout the entire support system, and fully utilizing the load-bearing capacity of the hanging basket and bracket materials.

Description

Technical Field

[0001] This invention relates to a structure and method for the coordinated force-bearing of the hanging basket and bracket in the construction of the cast-in-place side span of an integral box girder, belonging to the technical field of cast-in-place side span construction. Technical Background

[0002] In common prestressed concrete bridges, straight sections of the side spans are usually constructed by erecting steel pipe supports. However, with the widespread promotion of bridge construction, it is also necessary to construct cast-in-place sections of side spans with piers over 30m high. For such terrain, the bracket method of pre-embedded triangular brackets in the pier body is often used.

[0003] Meanwhile, with the continuous improvement of bridge construction standards and the increasing demand for faster construction schedules, it is common to encounter situations where scaffolding and formwork are constructed simultaneously, especially in cast-in-place side spans exceeding 8 meters. Currently, the scaffolding and formwork are often constructed separately, with the formwork being the final piece of the cast-in-place side span construction. During construction, the two ends rely on the support of the scaffolding and the traction force of the formwork, without considering the overall coordinated force distribution between the scaffolding and formwork. Consequently, the load-bearing capacity of the materials cannot be fully utilized when the scaffolding and formwork are used in conjunction. Furthermore, because the formwork and scaffolding cannot guarantee overall coordinated force distribution, there is a significant discrepancy between the actual construction and theoretical technical specifications. Therefore, for bridges with high pier heights, the construction risks are high, the construction precision control is low, and the safety hazards are significant. Summary of the Invention

[0004] Therefore, the purpose of this invention is to provide a structure and method for the coordinated force-bearing of the hanging basket and bracket in the construction of the cast-in-place section of the side span of an integral box girder, which can effectively solve the above-mentioned construction technology problems and safety performance problems.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions: The method of coordinating the load-bearing capacity of the hanging basket and bracket during the construction of the cast-in-place section of the integral box girder is to use the bottom suspension beam of the bracket and the hanging basket as the erection platform for the cast-in-place section support. When the bottom suspension beam of the bracket and the hanging basket overlap, a force adjustment device is set between the bottom suspension beam of the hanging basket and the bracket to enable the hanging basket and the bracket to cooperate in bearing the load, better distribute the load, make the entire support system uniformly stressed, and give full play to the load-bearing capacity of the hanging basket and bracket materials.

[0006] The formwork and bracket cooperative force-bearing structure for the construction of the cast-in-place section of the side span of the integral box girder includes a bracket fixed on the pier, a formwork located at the cantilever section, a bottom suspension beam with adjustable height on the formwork, construction supports for the cast-in-place section of the side span on the bracket and the bottom suspension beam, and a cooperative force-bearing adjustment device in the overlapping area of ​​the bottom suspension beam and the bracket of the formwork.

[0007] The aforementioned structure for the coordinated load-bearing of the formwork and bracket in the construction of the cast-in-place section of the integral box girder side span is that a counterweight is also provided on the bracket, and the counterweight is placed on the bracket away from the formwork.

[0008] The aforementioned structure for the coordinated force-bearing of the hanging basket and bracket in the construction of the cast-in-place section of the integral box girder side span is such that the coordinated force-bearing adjustment device is a device that connects the bottom hanging beam and bracket in the vertical direction and can realize the interaction force.

[0009] The aforementioned structure for the coordinated force-bearing of the hanging basket and bracket in the construction of the cast-in-place section of the integral box girder side span is such that the coordinated force-bearing adjustment device is a tie rod assembly and support device that can adjust the distance between the bottom hanging beam and the bracket.

[0010] The aforementioned structure for the coordinated force-bearing structure of the hanging basket and bracket in the construction of the cast-in-place section of the side span of the integral box girder is as follows: the coordinated force-bearing adjustment device includes a hanging rod and a matching hanging plate. The upper end of the hanging rod is connected to the bottom hanging beam, and the lower end passes through the bracket and is connected to the hanging plate. The upper surface of the hanging plate is in contact with the bottom surface of the bracket.

[0011] The aforementioned formwork and bracket cooperative force-bearing structure for the construction of the cast-in-place section of the side span of the integral box girder is as follows: the cooperative force-bearing adjustment device also includes a horizontal beam located on multiple brackets and a jack, with the horizontal beam located between the bottom hanging beam and the bracket, and the jack located between the horizontal beam and the bottom hanging beam.

[0012] The aforementioned formwork and bracket cooperative force-bearing structure for the construction of the cast-in-place section of the side span of the integral box girder is as follows: the cooperative force-bearing adjustment device also includes a horizontal support rod and a lower jack located horizontally below multiple brackets. The horizontal support rod is located between the hanging plate and the bracket, and the lower jack is located between the horizontal support rod and the bracket.

[0013] The beneficial effects of this invention are: The construction of the cast-in-place side span of the integral box girder adopts a formwork + bracket collaborative stress structure and method. Compared with the existing independent bracket construction method, the strength of the bracket can be reduced, the amount of steel used can be reduced, and the construction cost can be reduced. At the same time, due to the reduction of the weight of the bracket itself, the hoisting difficulty can be reduced, the construction difficulty can be reduced, and the requirements of the bracket loading preload on the pier structure can be further reduced.

[0014] Simply adding a force adjustment device to enable the hanging basket and bracket to work together under the force can improve the construction accuracy of the cast-in-place box girder section, and also save materials, making it economically excellent. Attached Figure Description

[0015] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings, wherein: Figure 1 This is a perspective view of the present invention; Figure 2This is a cross-sectional view of the invention along the transverse direction of the bridge. Figure 3 This is a schematic diagram of another type of coordinated force adjustment device. Figure 4 This is a schematic diagram of the operation of a collaborative force adjustment device according to the present invention; Figure 5 This is a schematic diagram of the second type of cooperative force adjustment device of the present invention. Detailed Implementation

[0016] Example 1: The formwork and bracket working together to bear the load during the construction of the cast-in-place section of the integral box girder side span, such as... Figure 1-3 As shown, bracket 3 is fixed to pier 10, and counterweight 2 is also provided on bracket 3, which is placed on the side of bracket 3 away from hanging basket 1. Hanging basket 1 is installed and fixed on cantilever section 11. Hanging basket 1 is provided with bottom suspension beam 9 with adjustable height. Support 4 for construction of side span cast-in-place section 5 is provided on bracket 3 and bottom suspension beam 9. Cooperative force adjustment device 8 is provided in the overlapping area of ​​bottom suspension beam 9 and bracket 3 of hanging basket 1. The cooperative force adjustment device 8 is a device that vertically connects bottom suspension beam 9 and bracket 3 and can realize interaction force, such as two threaded rods 17 with opposite thread directions, which are respectively connected to bottom suspension beam 9 and bracket 3. The two threaded rods 17 are connected by connector 18. Rotating connector 18 clockwise can reduce the distance between the two threaded rods 17, and rotating it counterclockwise can increase the distance between the two threaded rods 17.

[0017] Example 2: The formwork and bracket working together to bear the load during the construction of the cast-in-place section of the integral box girder side span, such as... Figure 1-5 As shown, bracket 3 is fixed to pier 10, and counterweight 2 is also provided on bracket 3, which is placed on the side of bracket 3 away from hanging basket 1. Hanging basket 1 is installed and fixed on cantilever section 11, and hanging basket 1 is provided with a bottom suspension beam 9 with adjustable height. Support 4 for construction of side span cast-in-place section 5 is provided on bracket 3 and bottom suspension beam 9. Cooperative force adjustment device 8 is provided in the overlapping area of ​​bottom suspension beam 9 and bracket 3 of hanging basket 1. The cooperative force adjustment device 8 is a tie rod assembly and support device with adjustable distance connected to bottom suspension beam 9 and bracket 3.

[0018] The specific coordinated force adjustment device 8 includes a suspension rod 13 and a matching suspension plate 14. The upper end of the suspension rod 13 is connected to the bottom suspension beam 9, and the lower end passes through the bracket 3 and is connected to the suspension plate 14. The upper surface of the suspension plate 14 is in contact with the bottom surface of the bracket 3. To facilitate even force distribution on the multiple brackets 3, a crossbeam 15 is provided above the bracket 3, and a horizontal support rod 16 is provided below the bracket 3. The upper jack 6 is located between the crossbeam 15 and the bottom suspension beam 9, and the lower jack 7 is located between the horizontal support rod 16 and the bracket 3.

[0019] During the pouring of the cast-in-place section 5 of the integral box girder side span, the horizontal brace 16 and the upper or lower jacks 7 of the adjusting device 8 can be put into operation to ensure that the entire construction device system is subjected to uniform force and fully utilize the system's load-bearing capacity. For example, when the upper jack 6 at the bottom hanging beam 9 at the bottom of the hanging basket lifts the bottom hanging beam 9, a reaction force is generated that acts on the horizontal beam 15 below it. The force is transmitted to the bracket 3 through the horizontal beam 15, adjusting the coordinated force between the bracket 3 and the hanging basket 1. Alternatively, by adjusting the lower jack 7 to lift the bracket 3, the reaction force generated acts on the horizontal brace 16, thereby transferring the load to the hanging basket 1 and coordinating the coordinated force between the bracket 3 and the hanging basket 1.

[0020] The technical solutions of the present invention are not limited to the embodiments described herein, and the detailed technical content of the present invention is all well-known technology.

Claims

1. A formwork and bracket co-load-bearing structure for the construction of a cast-in-place section of an integral box girder side span, comprising a bracket (3) fixed to a pier (10), a formwork (1) located at the cantilever section (11), and a bottom suspension beam (9) with adjustable height provided on the formwork (1), characterized in that: A support (4) for the construction of the side span cast-in-place section is set on the bracket (3) and the bottom hanging beam (9). A coordinating force adjustment device (8) is set in the overlapping area of ​​the bottom hanging beam (9) and the bracket (3) of the hanging basket (1). The bracket (3) is located below the bottom hanging beam (9). The coordinating force adjustment device (8) includes a hanging rod (13) and a hanging plate (14) that cooperates with it. The upper end of the hanging rod (13) is connected to the bottom hanging beam (9), and the lower end of the hanging rod (13) passes through the bracket (3) and is connected to the hanging plate (14). The upper surface of the hanging plate (14) is in contact with the bottom surface of the bracket (3). The aforementioned coordinated force adjustment device (8) also includes a crossbeam (15) and an upper jack (6) located laterally on multiple brackets (3). The crossbeam (15) is located between the bottom hanging beam (9) and the bracket (3), and the upper jack (6) is located between the crossbeam (15) and the bottom hanging beam (9). The aforementioned coordinated force adjustment device (8) also includes a horizontal support rod (16) and a lower jack (7) located laterally below multiple brackets (3). The horizontal support rod (16) is located between the hanging plate (14) and the bracket (3), and the lower jack (7) is located between the horizontal support rod (16) and the bracket (3).

2. The formwork and bracket co-load-bearing structure for the construction of the cast-in-place section of the integral box girder side span as described in claim 1, characterized in that: A counterweight (2) is also provided on the bracket (3), and the counterweight (2) is placed on the bracket (3) on the side away from the hanging basket (1).

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