Fabricated pier beam temporary consolidation structure of cast-in-cantilever continuous beam bridge

Abstract

The utility model belongs to the field of temporary consolidation structures, and particularly relates to a prefabricated pier-beam temporary consolidation structure of a cast-in-cantilever continuous beam bridge, which comprises a pier, a box beam, a prestressed tendon and a temporary support, a permanent support and the temporary support are arranged at the top of the pier, and a prestressed tendon anchoring padstone is arranged on a bottom plate of the box beam. An anchor bearing plate is arranged on the anchoring padstone, and the prestressed tendons are anchored on the anchor bearing plate through anchorage devices and clamping pieces. The temporary supports are arranged on the bridge piers, the steel hoops, the prestressed tendons and other structures are arranged on the temporary supports, the box girders can be supported through the temporary supports in the box girder cantilever casting process, meanwhile, the box girders and the bridge piers are locked through the prestressed tendons, and therefore the box girders are more stable, construction safety is guaranteed, and construction efficiency is improved. And after the box girders are closed, the temporary supports, the steel hoops, the rubber blocks, the bolts, the anchor backing plates and the support steel plates can be disassembled and reused.

Description

Technical Field

[0001] This utility model relates to the field of temporary consolidation structure technology, specifically a prefabricated pier-beam temporary consolidation structure for cantilever cast continuous beam bridges. Background Technology

[0002] The prefabricated pier-beam temporary support structure for cantilever continuous beam bridges is a crucial aspect of structural design, directly impacting the safety of box girder construction. However, current technologies primarily employ cast-in-place ordinary reinforced concrete structures for pier-beam temporary support. This requires reinforcement installation, formwork installation, and concrete pouring on the pier, which not only compromises construction safety but also reduces work efficiency, consumes a large amount of reinforcing steel, and necessitates waiting for the concrete to solidify before proceeding to the next construction step. Furthermore, dismantling the temporary support involves chiseling away concrete and cutting reinforcing steel at the pier top, which is unsafe, inefficient, and generates dust that pollutes the environment. Therefore, improvements to existing technologies are necessary. Utility Model Content

[0003] The purpose of this utility model is to provide a prefabricated pier-beam temporary consolidation structure for cantilever continuous beam bridges, which solves the problems of construction safety hazards, low efficiency, steel waste, and environmental pollution associated with temporary consolidation structures.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a prefabricated pier-beam temporary consolidation structure for a cantilever continuous beam bridge, comprising a box girder, temporary supports, piers, and prestressing tendons. A temporary support is provided between the box girder and the pier. An anchoring pad is provided on the bottom plate of the box girder, and an anchor plate is provided on the upper part of the anchoring pad. Pre-drilled holes are provided on the bottom plate of the box girder, the anchoring pad, and the anchor plate. The lower part of the prestressing tendons is anchored in the pier, and the upper part of the prestressing tendons is anchored on the anchor plate. A support steel plate is provided between the box girder and the temporary support. A steel clamp is provided on the outside of the temporary support. A permanent support is provided on the pier.

[0005] Preferably, the temporary support includes two blocks A and one block B. Block B is disposed between the two rows of prestressing tendons, and block A is disposed on the outside of the prestressing tendons. Block A and block B are spliced ​​together to form a temporary support, which forms two rows of circular holes after splicing. The temporary support can support the box girder and ensure the stability of the box girder.

[0006] Preferably, rubber pads are provided at the four corners between the temporary support and the steel clamp, a support steel plate is provided on the upper part of the temporary support, the steel clamp is fastened by four high-strength bolts, and a reserved hole is provided on the support steel plate. The steel clamp is composed of two half-frames connected by high-strength bolts. The steel clamp can fasten the temporary support into a whole, improving the overall stability.

[0007] Preferably, the lower parts of the prestressing tendons, the first compensating prestressing tendons, and the second compensating prestressing tendons are anchored in the pier by the anchoring devices, wedges, and concrete bonding. The upper parts of the prestressing tendons, the first compensating prestressing tendons, and the second compensating prestressing tendons are anchored to the anchor plate by the anchoring devices, wedges, and anchor stones. The anchor plate and anchor stone can provide a solid supporting surface for the anchors, ensuring reliable locking of the prestressing tendons.

[0008] Preferably, the anchor pad concrete and the box girder bottom slab concrete are poured and formed simultaneously.

[0009] Preferably, there are multiple prestressing tendons, first-compensation prestressing tendons, and second-compensation prestressing tendons. These tendons are evenly distributed in two rows inside the temporary support. All prestressing tendons, first-compensation prestressing tendons, and second-compensation prestressing tendons freely pass through the splicing holes of the temporary support and the reserved holes of the support steel plate, box girder bottom plate, anchor pad, and anchor plate. Prestressing tendons, instead of ordinary steel bars, can enhance the reliability of the temporary consolidation structure and improve construction safety.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] This utility model provides reliable support for the box girder during cantilever casting by installing prefabricated temporary supports, prestressed tendons, and steel hoops on the bridge piers. At the same time, the prestressed tendons increase the connection strength between the temporary supports, the box girder, and the bridge piers, making the box girder structure more stable and saving ordinary steel bars. Furthermore, after the box girder is closed, the temporary supports can be disassembled and reused without generating dust during disassembly, making it a green and environmentally friendly technology. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0013] Figure 2 For the present utility model Figure 1 Sectional view of plane AA;

[0014] Figure 3 For the present utility model Figure 1 BB section view;

[0015] Figure 4 For the present utility model Figure 1 A schematic diagram of the temporary support;

[0016] Figure 5 For the present utility model Figure 3 A schematic diagram of node C;

[0017] Figure 6 For the present utility model Figure 3 A schematic diagram of node D.

[0018] In the diagram: 1. Box girder; 2. Temporary support; 3. Pier; 4. Permanent support; 5. Prestressed tendon; 6. First-stage compensating prestressed tendon; 7. Second-stage compensating prestressed tendon; 8. Steel clamp; 9. Rubber pad; 10. High-strength bolt; 11. Support steel plate; 12. Anchor pad; 13. Anchor plate; 14. Anchor; 15. Wedge; 21. Block A; 22. Block B. Detailed Implementation

[0019] 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.

[0020] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 A prefabricated pier-beam temporary consolidation structure for a cantilever continuous beam bridge includes a box girder 1, a temporary support 2, a pier 3, prestressing tendons 5, first-compensation prestressing tendons 6, second-compensation prestressing tendons 7, and steel clamps 8. The box girder 1 has prestressing tendons 5, first-compensation prestressing tendons 6, and second-compensation prestressing tendons 7 on its bottom plate. The box girder 1 and the pier 3 are connected by a temporary support 2. The box girder 1 has an anchoring pad 12 on its bottom plate. The anchoring pad 12 has an anchor plate 13 on its upper part. The box girder 1 and the temporary support 2 are connected by a support steel plate 11. The temporary support 2 is externally mounted with steel clamps 8. The pier 3 is supported by a permanent support 4.

[0021] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6The temporary support 2 includes block A 21 and block B 22. Block B 22 is set between the two rows of prestressing tendons 5, the first compensating prestressing tendons 6, and the second compensating prestressing tendons 7. Temporary block A 21 is set on the outside of the two rows of prestressing tendons 5, the first compensating prestressing tendons 6, and the second compensating prestressing tendons 7. Block A 21 and block B 22 are spliced ​​together to form the temporary support 2. The temporary support 2 can support the box girder 1 and increase the stability of the box girder 1. Rubber pads 9 are set on the outside of the temporary support 2. Steel clamps 8 are closely attached to the rubber pads 9. The steel clamps 8 are composed of two half-frames installed by bolts. The steel clamps 8 are fastened by high-strength bolts 10.

[0022] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 The prestressing tendons 5, 6, and 7 are anchored in the pier 3 by the anchorage devices 14 and 15 and the concrete bonding effect. The prestressing tendons 5, 6, and 7 are anchored in the upper part of the anchorage devices 14 and 15 on the anchor plate 13 by the anchorage devices 14 and 15. There are multiple prestressing tendons 5, 6, and 7. The multiple prestressing tendons are evenly distributed in two rows inside the temporary support 2, which reliably locks the box girder 1, the temporary support 2, and the pier 3, improving the construction safety during the cantilever construction of the box girder 1.

[0023] The specific implementation process of this utility model is as follows: The temporary support 2 is prefabricated in the prefabrication yard. The temporary support 2 is divided into three parts with the longitudinal axis of the two rows of steel strands as the dividing line. The two outer parts are A blocks 21 and the middle part is B blocks 22. That is, a temporary support 2 is composed of two A blocks 21 and one B block 22. The prestressed tendon 5 has a reserved hole for splicing round hole. The concrete strength grade of the temporary support 2 is the same as that of the box girder 1.

[0024] After the temporary support 2 meets the design strength requirements, installation begins. The installation of temporary support 2 follows a combination of block A21-block B22-block A21, ensuring accurate positioning. The principle is to center the prestressing tendon 5, the first compensating prestressing tendon 6, and the second compensating prestressing tendon 7 within the splicing circular hole to reduce stress loss due to friction with the hole wall during later prestressing tensioning. A support steel plate 11, with the same length and width dimensions as temporary support 2, is installed on the upper part of temporary support 2. Pre-drilled holes are cut on the support steel plate 11, with the same positions as the prestressing tendons 5, 6, and 7. The support steel plate 11 is tightly fitted to the top of temporary support 2. A steel clamp 8 is installed externally, with the upper and lower edges of the steel clamp 8 10 cm away from the upper and lower edges of the temporary support 2. High-strength bolts are installed on both sides along the length. Rubber pads 9 of the same height as the steel clamp 8 and the temporary support 2 are installed at the four corners, with a thickness of 10 cm and a width of 20 cm, i.e., 10 cm on each side, to ensure that the steel clamp 8 fits snugly with the temporary support 2. The prestressing tendon 5 is tensioned and locked after the construction of the zero block of the box girder 1 is completed. The first compensation prestressing tendon 6 is tensioned and locked as prestress loss compensation when the total segment length of the box girder 1 is halfway through. The second compensation prestressing tendon 7 is tensioned and locked as prestress loss compensation when the total segment length of the box girder 1 is three-quarters through.

[0025] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A prefabricated pier-beam temporary consolidation structure for a cantilever continuous beam bridge, comprising a box girder (1), temporary supports (2), piers (3), and prestressed tendons (5), characterized in that: A temporary support (2) is provided on the pier (3), a temporary fixed locking prestressing tendon (5) is provided on the bottom plate of the box girder (1), a temporary support (2) is installed between the box girder (1) and the pier (3), an anchoring pad (12) is provided on the bottom plate of the box girder (1), an anchor plate (13) is provided on the top of the anchoring pad (12), a support steel plate (11) is provided between the box girder (1) and the temporary support (2), a first compensation prestressing tendon (6) and a second compensation prestressing tendon (7) are provided on the bottom plate of the box girder (1), a reserved hole is provided on the bottom plate of the box girder (1), a steel clamp (8) is installed on the outside of the temporary support (2), and a permanent support (4) is provided on the pier (3).

2. The prefabricated pier-beam temporary consolidation structure for cantilever continuous beam bridge according to claim 1, characterized in that: The temporary support (2) includes two blocks A (21) and one block B (22). Block B (22) is installed between the two rows of prestressed tendons (5). Block A (21) is set on the outside of the prestressed tendons (5). Block A (21) and Block B (22) are spliced ​​together to form two rows of round holes.

3. The prefabricated pier-beam temporary consolidation structure for a cantilevered continuous beam bridge according to claim 1, characterized in that: Rubber pads (9) are provided at the four corners between the temporary support (2) and the steel clamp (8). The steel clamp (8) is fastened by four high-strength bolts (10). The support steel plate (11) is provided with reserved holes.

4. The prefabricated pier-beam temporary consolidation structure for a cantilevered continuous beam bridge according to claim 1, characterized in that: The prestressed tendons (5), the first compensating prestressed tendons (6) and the second compensating prestressed tendons (7) are all anchored to the pier (3) and connected by anchoring after the concrete solidifies. The lower part of the prestressed tendons (5), the first compensating prestressed tendons (6) and the second compensating prestressed tendons (7) are all provided with anchoring devices (14) and wedges (15).

5. The prefabricated pier-beam temporary consolidation structure for a cantilevered continuous beam bridge according to claim 1, characterized in that: The concrete of the anchor pad stone (12) is poured and formed synchronously with the concrete of the bottom plate of the box girder (1). The anchor plate (13) is set on the upper part of the anchor pad stone (12). The anchor pad stone (12) and the anchor plate (13) are provided with reserved holes. The prestressing tendon (5), the first compensation prestressing tendon (6) and the second compensation prestressing tendon (7) are all provided with anchoring devices, anchorages (14) and wedges (15).

6. The prefabricated pier-beam temporary consolidation structure for a cantilevered continuous beam bridge according to claim 1, characterized in that: There are multiple prestressing tendons (5), first compensation prestressing tendons (6) and second compensation prestressing tendons (7). The multiple prestressing tendons (5), first compensation prestressing tendons (6) and second compensation prestressing tendons (7) are evenly distributed in two rows inside the temporary support (2). The prestressing tendons (5), first compensation prestressing tendons (6) and second compensation prestressing tendons (7) all pass freely through the splicing round hole of the temporary support (2) and the reserved holes of the support steel plate (11), box girder (1) bottom plate, anchor pad stone (12) and anchor plate (13).

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