An assembly type bracket suitable for single-column large cantilever cover beam

Abstract

The utility model relates to the field of bridge construction discloses a kind of assembly bracket suitable for single-column large cantilever bent cap, it is fixed in pier upper portion, including with the fixed connection of climbing cone pre-buried in pier upper portion corbel, the upper portion of pier body is connected the corbel of the both sides of pier body by fine rolled threaded steel to pull rod, the top of corbel is fixedly installed with truss B, the top of two groups of corbel is fixedly installed with truss A and truss C respectively, truss C is located the central position of truss A, two groups of truss A and truss C are fixedly connected with the left and right sides of truss B respectively by connecting bolt, the top of truss A, truss B and truss C is all provided with connecting piece, the top of connecting piece is provided with distribution beam, the top of distribution beam is fixedly connected with row A, row B and row C respectively;The utility model effectively solves the problem that single-column large cantilever bent cap drag bracket construction is difficult, and safe risk is high, and construction cycle is long, with very broad market prospect.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction, and in particular to a prefabricated bracket suitable for single-column cantilever cap beams. Background Technology

[0002] With the continuous advancement of modern transportation infrastructure construction, especially in projects such as high-speed railways, urban expressways, and large bridges, single-column cantilever cap beams have become an important structural form, widely used due to their ability to effectively increase the lateral span of bridges and enhance the overall structural stability. Single-column cantilever cap beams not only bear the weight of the bridge deck and its ancillary facilities but also directly affect the safety, durability, and aesthetics of the bridge; therefore, the scientific nature, rationality, and efficiency of this technology are particularly important.

[0003] Traditional single-column cantilever cap beam construction methods face numerous challenges, such as high construction difficulty, high safety risks, and long construction periods, especially when crossing existing transportation routes or complex terrain. How to improve construction efficiency and reduce the impact on the surrounding environment while ensuring construction quality and safety has become a critical issue that urgently needs to be addressed in the field of single-column cantilever cap beam construction.

[0004] Therefore, for single-column cantilever cap beams with high piers and unsuitable ground-mounted supports due to terrain limitations, a prefabricated bracket suitable for single-column cantilever cap beams is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a prefabricated bracket suitable for single-column cantilever cap beams. It aims to improve the existing technology for single-column cantilever cap beams with high piers, limited by terrain conditions and unsuitable for ground-mounted supports. Its construction needs to solve the problems existing in the traditional bracket method, so as to balance the issues of quality, safety, efficiency and impact on the surrounding environment.

[0006] To achieve the above objectives, this utility model adopts the following technical solution: a prefabricated bracket suitable for single-column cantilever cap beams, fixed to the upper part of the pier body, including corbels fixedly connected to climbing cones pre-embedded in the upper part of the pier body. The upper part of the pier body is connected to the corbels on both sides of the pier body by tie rods made of precision-rolled threaded steel. A truss B is fixedly installed on the top of the corbels. Two sets of trusses B are provided, and the two sets of trusses B are located on the front and rear sides of the pier body. Two sets of corbels are provided, and trusses A and trusses are fixedly installed on the top of the two sets of corbels respectively. C. Two sets of trusses A and C are provided. The two sets of trusses A and C are fixedly arranged on the left and right sides of the pier body, respectively. Truss C is located at the center of truss A. The two sets of trusses A and C are fixedly connected to the left and right sides of truss B by connecting pins. Connectors are provided at the top of trusses A, B and C. Distribution beams are provided at the top of the connectors. The top of the distribution beams are fixedly connected to frames A, B and C respectively. A template structure is provided at the top of frame B.

[0007] As a further description of the above technical solution:

[0008] Truss A and truss C are connected by a horizontal connector.

[0009] As a further description of the above technical solution:

[0010] The connector includes a drop block, and multiple sets of drop blocks are provided. The tops of the multiple sets of drop blocks are fixedly connected to the bottom of the distribution beam, and the bottoms of the multiple sets of drop blocks are respectively fixedly connected to the tops of truss A, truss B and truss C.

[0011] As a further description of the above technical solution:

[0012] An operating platform is fixedly connected to the top of the frame B.

[0013] As a further description of the above technical solution:

[0014] The template structure includes a steel template bottom mold fixedly connected to the top of the frame B, and a wooden template bottom mold fixedly connected to the top of the frame C.

[0015] As a further description of the above technical solution:

[0016] The unloading block is equipped with a lead screw on its exterior.

[0017] This utility model has the following beneficial effects:

[0018] This invention effectively solves the problems of high construction difficulty, high safety risks, and long construction period of single-column cantilever cap beams, and has a very broad market prospect. Through factory prefabrication and modular assembly, it significantly reduces dust and noise pollution and material waste at the construction site, and reduces the interference with the ecological environment. The high-precision prefabrication process and stability design significantly improve construction safety, reduce the risks of high-altitude operations, and ensure personnel safety. The construction method is simple and easy to implement, which can shorten the construction period. The equipment investment can be reused, creating good economic benefits. This method has great promotional value and provides a new idea for the construction of single-column cantilever cap beams for bridges. Attached Figure Description

[0019] Figure 1 This is a front elevation view of the bottom formwork of a prefabricated bracket for a single-column cantilever cap beam proposed in this utility model.

[0020] Figure 2 This is a front elevation view of the corbel of a prefabricated bracket suitable for a single-column cantilever cap beam proposed in this utility model.

[0021] Figure 3 This is a plan view of the tie rod of a precision-rolled threaded steel bar in an assembled bracket suitable for a single-column cantilever cap beam, as proposed in this utility model.

[0022] Figure 4 This is a schematic plan view of the frame at point B of a prefabricated bracket suitable for a single-column cantilever cap beam proposed in this utility model.

[0023] Figure 5 This is a side elevation view of the unloading block of an assembled bracket suitable for single-column cantilever cap beams proposed in this utility model.

[0024] Legend:

[0025] 1. Truss A; 2. Truss B; 3. Truss C; 4. Corbel; 5. Unloading block; 6. Distribution beam; 7. Frame B; 8. Frame C; 9. Frame A; 10. Operating platform; 11. Steel formwork bottom form; 12. Wooden formwork bottom form; 13. Precision rolled threaded steel tie rod; 14. Horizontal connector; 15. Connecting pin; 16. Pier body. Detailed Implementation

[0026] 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.

[0027] Reference Figures 1-3 This utility model provides an embodiment of a prefabricated bracket suitable for single-column cantilever cap beams, fixed to the upper part of the pier body 16. It includes corbels 4 fixedly connected to climbing cones pre-embedded in the upper part of the pier body 16. The corbels 4 serve as load-bearing transition components. The upper part of the pier body 16 is connected to the corbels 4 on both sides of the pier body 16 via precision-rolled threaded steel tie rods 13. The precision-rolled threaded steel tie rods 13 generate pre-tension force through tensioning, firmly fixing the corbels 4 to the pier body 16, ensuring that the corbels 4 do not loosen when bearing load, and providing a stable bottom support for the entire bracket. The top of the corbel 4 is fixedly equipped with truss B2. There are two sets of truss B2, located on the front and rear sides of the pier 16. The corbel 4 acts as a load-bearing transition member, transferring the load of truss B2 to the pier 16 and providing the installation foundation and vertical support for truss B2. There are two sets of corbel 4, and truss A1 and truss C3 are fixedly installed on the top of the two sets of corbel 4 respectively. The corbel 4 simultaneously bears the weight of truss A1 and truss C3, distributing the load to the pier 16 through its own rigidity, ensuring the stable installation of the trusses on both sides.

[0028] Furthermore, two sets of trusses A1 and C3 are provided, with each set fixedly arranged on the left and right sides of the pier 16. Truss C3 is located at the center of truss A1. The two sets of trusses A1 and C3 form a symmetrically distributed lateral support structure on the left and right sides of the pier 16, constructing a three-dimensional stable frame surrounding the pier 16. Truss C3, located at the center of truss A1, can evenly distribute lateral loads (such as construction vibration and wind force), avoiding stress concentration on one side of the truss. The two sets of trusses A1 and C3 are fixedly connected to the left and right sides of truss B2 via connecting pins 15. Connecting pins 15 enable quick connection and fixation of trusses A1 and B2, ensuring effective force transfer between them and facilitating on-site installation and disassembly, shortening the time required for installation. During construction, trusses A1, B2, and C3 are all equipped with connectors at their tops. These connectors resist horizontal forces such as wind and vibration during construction, preventing lateral deformation of the trusses. Distribution beams 6 are installed at the top of the connectors, evenly distributing the load from the upper scaffolding and formwork to the lower trusses, preventing excessive local stress that could lead to truss deformation. They also provide a uniform installation benchmark for the scaffolding. Scaffolding A9, B7, and C8 are fixedly connected to the top of distribution beams 6. Scaffolding A9, B7, and C8 serve as vertical support frames, further distributing the load to distribution beams 6 and providing a stable installation platform for the operating platform 10 and the formwork. Their spacing is set according to design requirements to ensure balanced stress. A formwork structure is installed at the top of scaffolding B7.

[0029] Reference Figures 3-5Truss A1 and truss C3 are connected by a horizontal connector 14. The connector includes multiple sets of unloading blocks 5, the tops of which are fixedly connected to the bottom of the distribution beam 6. The bottoms of the multiple sets of unloading blocks 5 are respectively fixedly connected to the tops of truss A1, truss B2, and truss C3. The horizontal connector 14 laterally connects truss A1 and truss C3, forming a closed spatial force-bearing frame with the trusses B2 on the front and rear sides, effectively resisting horizontal loads (such as wind force) during construction. Vibration loads are applied to prevent the truss structure from shifting or deforming due to lateral forces, thus enhancing the overall lateral stability of the bracket. Multiple sets of unloading blocks 5 serve as key force-transmitting components connecting the truss and the distribution beam 6. Their tops bear the vertical loads (such as the self-weight of concrete and construction loads) transmitted from the distribution beam 6. An operating platform 10 is fixedly connected to the top of the frame B7, providing a safe working surface for construction personnel, facilitating processes such as rebar tying, formwork adjustment, and concrete pouring, ensuring safety during high-altitude operations.

[0030] Furthermore, the template structure includes a steel template bottom mold 11 fixedly connected to the top of the frame B7. The steel template bottom mold 11 is used for concrete forming of the cantilever section of the cap beam. It is factory-processed with high precision and a smooth surface, which can ensure the structural dimensions and appearance quality of the cantilever section of the cap beam. A wooden template bottom mold 12 is fixedly connected to the top of the frame C8. The wooden template bottom mold 12 is suitable for the area in the middle of the cap beam affected by the pier body 16. It is easy to cut and process to adapt to complex spaces. The rubber strip at the joint with the pier body 16 can prevent grout leakage and contamination of the pier body 16 during concrete pouring. The outside of the unloading block 5 is equipped with a screw rod. The height of the screw rod can be adjusted to precisely control the pre-camber of the cap beam construction, ensuring that the cap beam meets the design elevation requirements after forming.

[0031] Working principle: Step 1, pier construction stage, pay attention to the pre-embedded grooves and climbing cones of the corbel 4 on the pier body 16 to facilitate the later installation of the corbel 4. At the same time, the bracket structure is prefabricated in the factory. The bracket adopts a modular design. According to the confirmed design drawings, the steel is precisely cut in the factory using CNC cutting equipment. The welding and grinding of the main components are completed to ensure that the strength of the key stress parts meets the standards. During the processing, the module size and weld quality are strictly inspected. After the welded modules are rust-proofed, they are classified and packaged according to number for easy transportation to narrow construction sites such as mountainous areas.

[0032] Step two: After the construction of pier body 16 is completed, remove the formwork of pier body 16 and begin the installation of the brackets beside the pier.

[0033] Before installing the bracket 4, first use the pre-embedded climbing cone to install the construction platform, then use a crane to install the bracket 4 in place, and then install the fine-rolled threaded steel tie rod 13 to fix and pre-tighten the bracket 4. The fine-rolled threaded steel tie rod 13 should be tensioned.

[0034] Next, install the truss structure of the bracket. First, use a crawler crane to install truss B2, place it above the bracket 4 and temporarily fix it. Then install truss A1 and truss C3. Truss A1 and truss B2 are directly connected and fixed by connecting pins 15. Truss C3 is placed on the bracket 4, and the threaded steel tie rods 13 are installed and tensioned. Then fix truss C3 to the pier. In order to enhance the stability between the trusses, horizontal connectors 14 are used to connect truss A1 and truss C3.

[0035] Step 3: After the truss of the bracket is installed, the unloading block 5 is installed. The unloading block 5 has a built-in screw for adjusting the elevation up and down, which can effectively control the pre-camber of the cap beam. Before installing the unloading block 5, the surveyor needs to accurately lay out and determine the position. Then, install the frame A9, frame B7 and frame C8. The spacing between them needs to be distributed according to the drawing requirements. Finally, the distribution beam 6 and the operating platform 10 are erected.

[0036] Step four: After the bracket is erected to meet the requirements, measure the elevation of the design center point and each control point of the pier column. Lay the bottom formwork according to the design center line of the cap beam. For the cantilever part, use steel formwork bottom formwork 11, which is factory-processed and has good formwork quality. For the middle part, due to the influence of the pier column, use wooden formwork bottom formwork 12, which is easy to operate, process and manufacture. Rubber strips are used to stop the grouting at the joint between the wooden formwork bottom formwork 12 and the pier column to prevent cement slurry from contaminating the pier column during concrete pouring.

[0037] Step 5: Proceed with subsequent steel reinforcement fabrication (the reinforcement of the cap beam is processed and fabricated in the field, transported to the site by flatbed truck for binding, and assisted by a truck crane for hoisting), prestressed duct layout, side formwork installation, and other processes, and finally complete the pouring of the cap beam concrete.

[0038] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A prefabricated bracket suitable for single-column cantilever cap beams, characterized in that: Fixed to the upper part of the pier body (16), including corbels (4) fixedly connected to the climbing cones pre-embedded in the upper part of the pier body (16), the upper part of the pier body (16) is connected to the corbels (4) on both sides of the pier body (16) by tie rods (13) made of fine rolled threaded steel. A truss B (2) is fixedly installed on the top of the corbels (4). Two sets of trusses B (2) are provided. The two sets of trusses B (2) are located on the front and rear sides of the pier body (16). Two sets of corbels (4) are provided. A truss A (1) and a truss C (3) are fixedly installed on the top of the two sets of corbels (4) respectively. Two sets of trusses A (1) and truss C (3) are provided. The trusses A (1) and C (3) are fixedly arranged on the left and right sides of the pier body (16), respectively. The truss C (3) is located at the center of the truss A (1). The two sets of trusses A (1) and C (3) are fixedly connected to the left and right sides of the truss B (2) through connecting pins (15). The top of the trusses A (1), B (2) and C (3) are all provided with connectors. The top of the connectors is provided with distribution beams (6). The top of the distribution beams (6) is fixedly connected with frames A (9), B (7) and C (8), respectively. The top of the frame B (7) is provided with a template structure.

2. The assembled bracket for a single-column cantilever cap beam according to claim 1, characterized in that: The truss A (1) and truss C (3) are connected by a horizontal connector (14).

3. The assembled bracket for a single-column cantilever cap beam according to claim 1, characterized in that: The connector includes a drop block (5), and multiple sets of drop blocks (5) are provided. The top of each set of drop blocks (5) is fixedly connected to the bottom of the distribution beam (6), and the bottom of each set of drop blocks (5) is fixedly connected to the top of truss A (1), truss B (2) and truss C (3) respectively.

4. The assembled bracket for a single-column cantilever cap beam according to claim 1, characterized in that: An operating platform (10) is fixedly connected to the top of the frame B (7).

5. A prefabricated bracket suitable for single-column cantilever cap beams according to claim 1, characterized in that: The template structure includes a steel template bottom mold (11) fixedly connected to the top of the frame B (7), and a wooden template bottom mold (12) fixedly connected to the top of the frame C (8).

6. A prefabricated bracket suitable for single-column cantilever cap beams according to claim 3, characterized in that: The unloading block (5) is provided with a lead screw on its exterior.

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