Bridge widening section steel box girder pushing double-layer support device

Abstract

The utility model relates to a bridge widening section steel box girder pushing double-layer support device which is composed of a bottom-layer support and a top-layer support, bottom-layer stand columns of the bottom-layer support extend out of wet joints of a widening bridge, and the tops of the bottom-layer stand columns are jointly connected with a bottom-layer distribution girder. The top of the bottom distribution beam supports a top support, the top of the top support is in lap joint with a pushing distribution beam, and the top of the pushing distribution beam is connected with a pushing device. According to the support device, the double-layer support is arranged at the wet joint of the widening bridge, and the problem of crossing existing expressway bridges and widening sections is effectively solved.

Description

Technical Field

[0001] The utility model relates to a double-layer jacking support device for a steel box girder in a bridge widening section, belonging to the technical field of construction tools for building bridges. Background Technique

[0002] With the continuous development of China's economy, the construction of expressways has played a key role in the country's economic construction and boosting domestic demand. Along with the development of urban road traffic and the construction of urban agglomerations, the intersections of expressways are increasing day by day, and crossing existing expressways has also become a difficult point in highway construction.

[0003] At present, the structural forms for crossing existing expressways mainly include steel box girders, cantilever cast girders, cast-in-place box girders, and precast girders. However, it is necessary to fully consider the current situation of the existing expressway, the form of the existing line, whether it is a subgrade or a bridge; the number of lanes, such as two-way four-lane or six-lane; the original landform status on both sides of the line, whether it is a water area or land; the impact of the structure of the crossing bridge on the cost, etc. For the bridge widening section of the existing expressway bridge, considering the span of the existing bridge and the safety impact factors on the traffic of the expressway, using a long-span steel box girder to cross is also a commonly used scheme at present. When using the steel box girder to jack and cross the bridge widening section of the existing expressway bridge, the impact on traffic is small, the safety risk is low, and there is less cross-operation. The precast girders of the widened bridge can be installed first; due to the small width of the median strip of the existing expressway, generally the existing line and the main line are obliquely intersecting, and it is impossible to set up temporary supports in the central separation, so it can only be considered to set up supports on the newly built widened bridge; although it is feasible to set up supports on the newly built widened bridge, considering the influence of the vertical force and horizontal thrust during jacking, it is necessary to support and reinforce the bottom of the precast girders of the newly built widened bridge to ensure uniform force, but the process is complex and the construction difficulty is large. Therefore, it is considered to establish a double-layer support, that is, one layer of support vertically penetrates from the wet joint of the newly built widened bridge, and after setting up a distribution beam on its top, a second layer of support is erected on the top.

[0004] Therefore, when crossing the widened section of the existing expressway bridge, using the double-layer jacking support method to replace the support on the bridge, the structure is safe and stable, and this construction method effectively improves the efficiency and reduces the cost.

[0005] When crossing the bridge widening section of the existing expressway bridge, due to using the support on the bridge, it has a greater impact on the structure of the newly built widened bridge, the process is complex, the construction difficulty is large, and the cost is relatively high. Summary of the Invention

[0006] The technical problem to be solved by the utility model is to provide a double-layer jacking support device for a steel box girder in a bridge widening section. The support device sets up a double-layer support at the wet joint of the widened bridge, effectively solving the problems of crossing the existing expressway bridge and its widening section.

[0007] To solve the above problems, the specific technical solution of the present utility model is as follows: A double-layer bracket device for jacking a steel box girder in a widened section of a bridge, which is composed of a bottom bracket and a top bracket. The bottom columns of the bottom bracket extend out from the wet joints of the widened bridge, and the tops of the bottom columns are jointly connected to the bottom distribution beam; the top of the bottom distribution beam supports the top bracket, the top of the top bracket overlaps the jacking distribution beam, and the top of the jacking distribution beam is connected to the jacking device.

[0008] The bottom bracket includes four bottom columns and six bottom distribution beams. Among them, the four bottom columns are rectangularly distributed, two of the bottom columns extend out from the same wet joint, and the other two extend out from adjacent wet joints respectively; among them, the four bottom distribution beams are sequentially connected to the tops of two adjacent bottom columns to form a closed rectangular structure, and the other two bottom distribution beams form a cross structure, and the four endpoints are respectively positioned at the midpoints corresponding to the closed rectangle.

[0009] The distance H between the bottom surfaces of the four distribution beams forming the closed rectangle and the bridge deck of the widened bridge is 0.1 to 0.3 meters.

[0010] Steel pipes are arranged in a Z shape between adjacent bottom columns.

[0011] The top bracket includes four top columns, a top lower distribution beam and a top upper distribution beam; among them, the number of the top lower distribution beams is two and they are arranged in parallel. Each top lower distribution beam is obliquely overlapped on the upper surface of the bottom distribution beam. The four top columns are respectively vertically welded on the top lower distribution beam, and the four top columns are rectangularly distributed; a top upper distribution beam is arranged between the spaced top columns. The two top upper distribution beams are parallel and the projection is perpendicular to the top lower distribution beam; the jacking distribution beam is jointly overlapped on the upper surfaces of the two top upper distribution beams.

[0012] The projections of the two top lower distribution beams and the two top upper distribution beams form a rectangular structure. The center of the rectangular structure is concentric with the rectangular structure composed of the four bottom distribution beams, and the rectangular sides form an angle of 25° to 30°.

[0013] Horizontal and stay steel pipes are respectively arranged between adjacent top columns.

[0014] The double-layer bracket device for jacking a steel box girder in the widened section of the bridge of the present application adopts the above structure and has the following advantages:

[0015] 1. Stable structure: Adopting the structure of the upper and lower split bottom bracket and top bracket, the overall shear and torsion resistance performance is stable;

[0016] 2. Safe and reliable: The overall structure adopts steel pipe piles and profiled steel, with fewer splicing joints, small settlement values and less elastic deformation;

[0017] 3. Easy to install: All components are assembled and welded on-site. With a simple introduction, the on-site construction workers can install them. High construction efficiency lays a good foundation for the smooth construction of the overall project.

[0018] 4. Good comprehensive benefits: High turnover times, convenient for transportation and management, no scattered and easily lost components, low loss, and environmentally friendly, energy-saving and reusable.

[0019] 5. Strong adaptability: Can be widely used in the construction of existing bridges across highways, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view schematic diagram of the double-layer bracket device for the incremental launching of the steel box girder in the bridge widening section.

[0021] Figure 2 It is a top view schematic diagram of the double-layer bracket device for the incremental launching of the steel box girder in the bridge widening section.

[0022] Figure 3 It is a top view schematic diagram of the bottom bracket.

[0023] Figure 4 It is a top view schematic diagram of the top bracket. DETAILED DESCRIPTION OF THE INVENTION

[0024] As Figure 1 and Figure 2 shown, a double-layer bracket device for the incremental launching of the steel box girder in the bridge widening section is composed of a bottom bracket 10 and a top bracket 20. The bottom columns 11 of the bottom bracket 10 extend from the wet joint of the widened bridge, and the tops of the bottom columns 11 are jointly connected to the bottom distribution beam 12. The top of the bottom distribution beam 12 supports the top bracket 20. The top of the top bracket 20 overlaps with the incremental launching distribution beam 31, and the top of the incremental launching distribution beam 31 is connected to the incremental launching device 32. During the construction process, by adjusting the overlapping angle of the incremental launching distribution beam 31, ensure that its length direction is perpendicular to the moving direction of the steel box girder.

[0025] As Figure 3 shown, the bottom bracket 10 includes four bottom columns 11 and six bottom distribution beams 12. Among them, the four bottom columns 11 are rectangularly distributed, two of the bottom columns 11 extend from the same wet joint, and the other two extend from adjacent wet joints respectively. Among them, the four bottom distribution beams 12 are sequentially connected to the tops of the adjacent two bottom columns 11 to form a closed rectangular structure, and the other two bottom distribution beams 12 form a cross structure, and the four endpoints are respectively positioned at the midpoints corresponding to the closed rectangle.

[0026] The distance H between the bottom surfaces of the four distribution beams 12 forming the closed rectangle and the bridge deck of the widened bridge is 0.1 - 0.3 meters, and 0.2 meters is preferably selected in this embodiment, so as to ensure that the surface of the high-speed widened bridge will not be damaged.

[0027] As Figure 4 shown, the top bracket 20 includes four top columns 21, a top lower distribution beam 22 and a top upper distribution beam 23; wherein the number of the top lower distribution beams 22 is two, and they are arranged in parallel. Each top lower distribution beam 22 is obliquely lapped on the upper surface of the bottom distribution beam 12. The four top columns 21 are vertically welded on the top lower distribution beams 22 respectively, and the four top columns 21 are distributed in a rectangle. A top upper distribution beam 23 is arranged between the spaced top columns 21. The two top upper distribution beams 23 are parallel and their projections are perpendicular to the top lower distribution beam 22. The jacking distribution beam 31 is jointly lapped on the upper surfaces of the two top upper distribution beams 23. The projections of the two top lower distribution beams 22 and the two top upper distribution beams 23 form a rectangular structure. The center of the rectangular structure is concentric with the rectangular structure formed by the four bottom distribution beams 12, and the rectangular sides form an angle of 25° to 30°. The bottom bracket 10 and the top bracket 20 are concentrically and staggeredly arranged, so as to improve the shear resistance and torsional resistance.

[0028] Steel pipes are arranged in a Z-shaped distribution between adjacent bottom columns 11; horizontal and stay cables steel pipes are respectively arranged between adjacent top columns 21. The steel pipes can improve the overall support stability of the columns.

Claims

1. A double-layer support device for pushing up a steel box girder in a widened section of a bridge, characterized in that: The invention comprises a bottom bracket (10) and a top bracket (20); the bottom column (11) of the bottom bracket (10) extends out from the wet joint of the widened bridge, and the top of the bottom column (11) is connected to the bottom distribution beam (12); the top of the bottom distribution beam (12) supports the top bracket (20), the top of the top bracket (20) overlaps the top-pushing distribution beam (31), and the top of the top-pushing distribution beam (31) is connected to the top of the top-pushing device (32).

2. The double-layer support device for pushing up the widened section steel box girder of the bridge according to claim 1 is characterized in that: The bottom support (10) comprises four bottom columns (11) and six bottom distribution beams (12), wherein the four bottom columns (11) are distributed in a rectangular shape, two of the bottom columns (11) extend from the same wet joint, and the other two extend from adjacent wet joints respectively; the four bottom distribution beams (12) sequentially connect the tops of two adjacent bottom columns (11) to form a closed rectangular structure, and the other two bottom distribution beams (12) form a cross structure, and the four end points are respectively positioned at the corresponding midpoints of the closed rectangle.

3. The double-layer support device for pushing up the widened section steel box girder of the bridge according to claim 2 is characterized in that: The distance H between the bottom surface of the four distribution beams (12) forming a closed rectangle and the bridge deck of the widened bridge is 0.1 to 0.3 meters.

4. The double-layer support device for pushing up the widened section steel box girder of a bridge according to claim 2 is characterized in that: Adjacent bottom-level columns (11) are provided with steel pipes distributed in a Z shape.

5. The double-layer support device for pushing up the widened section steel box girder of a bridge according to claim 2 is characterized in that: The top support (20) comprises four top columns (21), a top lower distribution beam (22) and a top upper distribution beam (23); wherein the number of the top lower distribution beams (22) is two and they are arranged in parallel, each of the top lower distribution beams (22) is overlapped obliquely on the upper surface of the bottom distribution beam (12), the four top columns (21) are respectively vertically welded to the top lower distribution beam (22), and the four top columns (21) are distributed in a rectangular shape; a top upper distribution beam (23) is arranged between the spaced top columns (21), the two top upper distribution beams (23) are parallel and projected perpendicular to the top lower distribution beam (22); and the top push distribution beam (31) is overlapped together on the upper surfaces of the two top upper distribution beams (23).

6. The double-layer support device for pushing up the widened section steel box girder of the bridge according to claim 5 is characterized in that: The projections of the two top-layer lower distribution beams (22) and the two top-layer upper distribution beams (23) form a rectangular structure, the center of the rectangular structure is concentric with the rectangular structure formed by the four bottom-layer distribution beams (12), and the sides of the rectangle are at an angle of 25° to 30°.

7. The double-layer support device for pushing up the widened section steel box girder of a bridge according to claim 5 is characterized in that: Horizontal and diagonal steel pipes are respectively arranged between adjacent top-level columns (21).

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