UHPC (Ultra High Performance Concrete)-based stand column and cover beam connecting structure
By adopting a UHPC-based column-and-cover beam connection structure in the prefabricated concrete frame structure, the problem of insufficient seismic performance of the prefabricated structure in earthquakes is solved, and efficient anchoring and seismic performance improvement of nodes is achieved.
Patent Information
- Application Number
- CN202421650577.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-06-10
- Estimated Expiration
- 2034-07-12
AI Technical Summary
The prefabricated concrete frame structure is severely damaged in earthquakes, making it difficult to achieve the same seismic resistance as the cast-in-place concrete structure.
The UHPC-based column and cover beam connection structure is adopted, and UHPC material is filled with outsourcing steel formwork to form the core area of the node, and components such as reserved steel bars, exhaust pipes and rubber support are used to achieve reliable anchoring between the column and the steel cover beam.
The load-bearing capacity and seismic resistance of the node are improved, while greatly reducing the anchoring length of the steel bars, and the compactness of the core area of the UHPC node is ensured through the exhaust pipe.
Smart Images
Figure CN222961876U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bridge construction, in particular to a connecting structure between a column and a capping beam based on UHPC. Background Technique
[0002] Cast-in-situ structures have many limitations such as low construction efficiency and high energy consumption, and it is gradually difficult to meet the development requirements of building industrialization. Prefabricated and assembled buildings have become the development direction of building industrialization due to their advantages such as fast construction speed, factory production of components, reduction of on-site wet operations, and reduction of environmental pollution. After years of development and popularization, precast and assembled concrete structures have been widely studied and used.
[0003] A precast and assembled concrete frame structure refers to a structure in which beam and column components are precast in a prefabrication factory and transported to the construction site for connection to form an integral structure. Compared with cast-in-situ concrete structures, it has the advantages of fast construction speed, easy guarantee of component quality, good quality, small environmental pollution, labor cost savings, and a large amount of formwork and support savings. It is a structural form with very broad prospects. For wet-connected precast concrete frame structures, a joint structure form that is easy to construct and can effectively ensure integrity is the key to its popularization and application. However, from past earthquake disasters, precast structures were severely damaged during earthquakes and it was difficult to achieve the same seismic performance as cast-in-situ structures. To improve the integrity and reliability of the connection of precast concrete frame joints and achieve even exceed the seismic performance of cast-in-situ concrete structures, UHPC (Ultra High Performance Concrete) materials were introduced into precast structures. UHPC has excellent bonding properties and can greatly reduce the anchorage length of steel bars in it; its strength is high and the amount of stirrups in the joint core area can be reduced. Therefore, constructing the connection between columns and capping beams based on UHPC is beneficial to further promote and apply precast concrete frame structures. Content of the Utility Model
[0004] The purpose of the utility model is to overcome the defects existing in the above-mentioned prior art and provide a connecting structure between a column and a capping beam based on UHPC. By using UHPC materials with excellent properties and applying them in the joint core area, reliable anchorage between the column and the steel capping beam can be achieved, which can not only improve the bearing capacity and seismic performance of the joint, but also greatly reduce the anchorage length of steel bars.
[0005] The purpose of the utility model can be realized by the following technical solutions:
[0006] The utility model provides a connecting structure between a column and a capping beam based on UHPC, including a steel capping beam and a column, and also including an external steel formwork, reserved steel bars, an exhaust pipe, and a rubber bearing;
[0007] One side of the external steel formwork is fixed to the side of the column, and the other side is fixedly connected to the steel capping beam. The external steel formwork is filled with UHPC material to form the UHPC joint core area. An inlet for grout is provided on the front surface of the external steel formwork, and the inlet for grout is used to fill the UHPC material into the external steel formwork.
[0008] One end of the reserved steel bar is inserted into the side of the column, and the other end is inserted into the steel capping beam.
[0009] The rubber bearing is arranged between the steel capping beam and the column.
[0010] One end of the exhaust pipe is inserted into the steel capping beam, and the other end is connected to the external steel formwork.
[0011] Further, exhaust holes are provided on the side surface of the external steel formwork.
[0012] Further, the exhaust pipe is in an L shape.
[0013] Further, there are two exhaust holes, and the two exhaust holes are respectively arranged on both sides of the external steel formwork.
[0014] Further, one end of the exhaust pipe is connected to the exhaust hole on the external steel formwork, and the other end is inserted into the steel capping beam.
[0015] Further, there are two exhaust pipes, and the two exhaust pipes are symmetrically arranged.
[0016] Further, one side of the external steel formwork is welded to the steel capping beam.
[0017] Further, the reserved steel bar is a ribbed steel bar and is longitudinally arranged.
[0018] Further, the reserved steel bar is welded to the steel capping beam.
[0019] Further, the welding spot is located inside the reserved steel bar inserted into the steel capping beam.
[0020] Compared with the prior art, the utility model has the following advantages and beneficial effects:
[0021] 1. The utility model adopts UHPC material with excellent performance and applies it to the joint core area, which can realize reliable anchoring between the column and the steel capping beam. It can not only improve the bearing capacity and seismic performance of the joint, but also greatly reduce the anchorage length of the steel bars.
[0022] 2. The utility model adopts an exhaust pipe, so that the filled grout can be fully exhausted, ensuring that the grout in the UHPC joint core area is dense and full. Description of the Drawings
[0023] Figure 1It is a structural schematic diagram of a connection structure between a column and a capping beam based on UHPC;
[0024] Figure 2 It is a structural schematic diagram of the pouring equipment in Embodiment 1.
[0025] Figure 1 Marking description in
[0026] 1 - Steel capping beam, 2 - Exhaust pipe, 3 - Outer steel formwork, 4 - Reserved steel bars, 5 - Joint core area, 6 - Welding points, 7 - Grout inlet, 8 - Rubber bearing, 9 - Column;
[0027] Figure 2 Marking description in
[0028] 10 - Pump pipe, 11 - Pump machine, 12 - Stirring and pouring integrated machine. Specific implementation manners
[0029] The following further elaborates on the specific implementation manners of the present utility model through embodiments. These embodiments are implemented on the premise of the solution described in the present utility model, and detailed implementation manners and specific operation processes are given. However, the protection scope of the present utility model is not limited to the following embodiments.
[0030] The following further elaborates on the present utility model in combination with the accompanying drawings and specific embodiments. Features such as component models, material names, connection structures, preparation means, materials, structures, or composition ratios that are not clearly described in the present technical solution are regarded as common technical features disclosed in the prior art.
[0031] Embodiment 1
[0032] This embodiment provides a connection structure between a column and a capping beam based on UHPC, as Figure 1 shown, including a steel capping beam 1, a column 9, an outer steel formwork 3, reserved steel bars 4, an exhaust pipe 2, and a rubber bearing 8. One side of the outer steel formwork 3 is fixed to the side of the column 9, and the other side is welded to the steel capping beam 1. The outer steel formwork 3 is filled with UHPC material to form a UHPC joint core area 5; a grout inlet 7 is provided on the front surface of the outer steel formwork 3, and the grout inlet 7 is used to fill the UHPC material into the outer steel formwork 3. Exhaust holes are provided on the side surface of the outer steel formwork 3, and there are two exhaust holes, which are respectively provided on both sides of the outer steel formwork 3. One end of the reserved steel bar 4 is inserted into the side of the column 9, and the other end is inserted into the steel capping beam 1.
[0033] The rubber bearing 8 is provided between the steel capping beam 1 and the column 9; the exhaust pipe 2 is in an L shape, one end of the exhaust pipe 2 is connected to the exhaust hole on the outer steel formwork 3, and the other end is inserted into the steel capping beam 1. There are two exhaust pipes 2, and the two exhaust pipes 2 are symmetrically arranged.
[0034] The reserved steel bar 4 is a ribbed steel bar and is longitudinally arranged. The reserved steel bar 4 is welded to the steel capping beam 1, and the welding spot 6 is located inside the reserved steel bar 4 inserted into the steel capping beam 1.
[0035] The specific pouring process is as follows: Prepare the external steel formwork 3, and open a slurry inlet 7 on the front surface of the external steel formwork 3 and exhaust holes on both side surfaces. Debug the equipment related to the mixing, pouring, and pumping of UHPC materials, such as Figure 2 shown, including a pump machine 11, a pump pipe 10 connected to the pump machine 11, and a mixing and pouring integrated machine 12. Before the formal pouring, wet the equipment and the pump pipe 10. Subsequently, mix the UHPC material, and use the pumping equipment to pump the slurry into the external steel formwork 3 from the slurry inlet 7 to form the UHPC joint core area 5. After stopping the grouting, let it stand for five minutes to exhaust the internal slurry and refill it to ensure that the slurry in the UHPC joint core area 5 is dense and full.
[0036] The above description of the embodiments is to enable those of ordinary skill in the art to understand and use the utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present utility model is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present utility model according to the disclosure of the present utility model should be within the protection scope of the present utility model.
Claims
1. A UHPC-based column and cap beam connection structure, comprising a steel cap beam (1) and a column (9), characterized in that: It also includes an outer steel formwork (3), reserved steel bars (4), an exhaust pipe (2) and a rubber support (8); The outer steel formwork (3) is fixed to the side of the column (9) on one side and fixedly connected to the steel cap beam (1) on the other side. The outer steel formwork (3) is filled with UHPC material to form a UHPC node core area (5). The front of the outer steel formwork (3) is provided with a slurry inlet (7), and the slurry inlet (7) is used to fill the UHPC material into the outer steel formwork (3). One end of the reserved steel bar (4) is inserted into the side of the column (9), and the other end is inserted into the steel cap beam (1); The rubber bearing (8) is arranged between the steel cap beam (1) and the column (9); One end of the exhaust pipe (2) is inserted into the steel cap beam (1), and the other end is connected to the outer steel formwork (3).
2. A UHPC-based column and cap beam connection structure according to claim 1, characterized in that: The side surface of the outer steel formwork (3) is provided with an exhaust hole.
3. A UHPC-based column and cap beam connection structure according to claim 2, characterized in that: Two exhaust holes are provided, and the two exhaust holes are respectively provided on two sides of the outer steel template (3).
4. The UHPC-based column and cap beam connection structure according to claim 1, characterized in that: The exhaust pipe (2) is L-shaped.
5. The UHPC-based column and cap beam connection structure according to claim 3, characterized in that: One end of the exhaust pipe (2) is connected to the exhaust hole on the outer steel formwork (3), and the other end is inserted into the steel cap beam (1).
6. The UHPC-based column and cap beam connection structure according to claim 3, characterized in that: Two exhaust pipes (2) are provided, and the two exhaust pipes (2) are symmetrically arranged.
7. The UHPC-based column and cap beam connection structure according to claim 1, characterized in that: One side of the outer steel formwork (3) is welded to the steel cap beam (1).
8. The UHPC-based column and cap beam connection structure according to claim 1, characterized in that: The reserved steel bars (4) are ribbed steel bars and are arranged longitudinally.
9. The UHPC-based column and cap beam connection structure according to claim 1, characterized in that: The reserved steel bars (4) are welded to the steel cap beam (1).
10. A UHPC-based column and cap beam connection structure according to claim 9, characterized in that: The welding point (6) is located on the inner side of the reserved steel bar (4) inserted into the steel cap beam (1).