A column cap connection structure for adding steel structure to the roof of an existing building

Abstract

This utility model provides a column cap connection structure for adding steel structures to the roof of existing buildings, relating to the field of building structure technology. It includes a column cap installed at the beam-column joint of the existing building, connected to the existing column. A closed stirrup is embedded within the column cap, wrapping around the beam end of the existing building. Anchor bolts are also embedded within the column cap, and the newly added steel structure is connected to the column cap via the anchor bolts. This utility model establishes a complete force transmission path by wrapping the beam end with closed stirrups, reliably withstanding the upward pull-out force of the steel structure. It can achieve various connection methods such as rigid connection, hinged connection, and sliding connection. The load of the newly added steel structure is directly transferred to the column, eliminating the need to reinforce the original beams and slabs, reducing renovation costs, and simplifying construction.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, specifically to a column cap connection structure for adding steel structure to the roof of an existing building. Background Technology

[0002] With the development of urban construction and changes in usage needs, existing buildings often require the addition of steel structures to their roofs to meet new functional requirements. In existing technologies, the following methods are commonly used to add steel structures to the roofs of existing buildings: steel columns are placed directly on the roof using concrete foundations, or the steel structure is further connected to the beams and columns of the roof structure using bolts.

[0003] However, the aforementioned conventional practices have significant technical flaws and limitations in application. First, when there is an upward pull-out force on the column bases or other forms of supports in the steel structure, the traditional direct placement of concrete foundations or simple bolt connections cannot effectively withstand and transmit this upward tension, leading to unreliable connections and potential safety hazards. Second, when the project requires a sliding connection between the steel structure supports and the existing structure, the existing rigid connection methods also cannot meet this special connection requirement.

[0004] Furthermore, to ensure that existing buildings can withstand the various loads transmitted from the new steel structure, current technical solutions typically require extensive reinforcement of the beams and slabs of the original structure. This approach not only increases the complexity and difficulty of construction but also significantly raises the cost of renovation and may have a substantial impact on the normal use of the existing building.

[0005] Therefore, how to reliably bear and transmit the upward pull force of the steel structure support when adding steel structure to the roof of an existing building, while meeting the requirements of different connection methods and avoiding large-scale reinforcement of the main structure, has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0006] The purpose of this utility model is to provide a column cap connection structure for adding steel structure to the roof of an existing building, which can reliably withstand the upward pull force of the steel structure, realize multiple connection methods, and does not require reinforcement of the main structural beams and slabs.

[0007] To achieve the above objectives, this utility model employs the following technical solution:

[0008] A column cap connection structure for adding steel structure to the roof of an existing building includes a column cap installed at the beam-column joint of the existing building. The column cap is connected to the column of the existing building. A closed stirrup is embedded in the column cap and wraps around the beam end of the existing building. An anchor bolt is also embedded in the column cap. The newly added steel structure is connected to the column cap through the anchor bolt.

[0009] Furthermore: the closed stirrups include vertical stirrups and horizontal stirrups, the vertical stirrups pass through the beams of the existing building and are bent into a closed shape, and the horizontal stirrups are tied to the vertical stirrups.

[0010] Furthermore, it also includes column cap tie bars, which pass through the beams of the existing building and connect the vertical stirrups and the horizontal stirrups.

[0011] Furthermore, the column cap is connected to the top of the existing building's column by roughening the surface.

[0012] Furthermore, the column cap is formed by casting with grout.

[0013] Furthermore, a sliding layer is provided between the newly added steel structure and the column cap.

[0014] Furthermore, the column cap is provided with a shear-resistant component.

[0015] Furthermore: the closed stirrups completely enclose the beam ends at the beam-column joints of the existing building, and are used to transfer the upward tensile force of the column caps to the beams, beam-column joints and columns of the existing building.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] I. This utility model can reliably withstand the upward pull-out force of steel structures. By completely enclosing the beam end of the existing building with closed stirrups, a complete force transmission path is established from the upward pull-out force of the column cap to the beam, then to the beam-column joint, and finally to the column. This effectively solves the technical problem of unreliable connection when there is an upward pull-out force at the column base of the steel structure in the prior art.

[0018] Second, this utility model diversifies the connection methods of steel structure supports. Through the connection structure of column cap and anchor bolt, various connection methods such as rigid connection, hinged connection and sliding connection can be realized, which meets the special requirements of different projects for connection forms and overcomes the limitation of the single connection method in the existing technology.

[0019] Third, this utility model avoids extensive reinforcement of the main structure. All the load of the newly added steel structure is directly transferred to the columns through the column caps, eliminating the need to reinforce the beams and slabs of the original structure, thus significantly reducing the complexity of the project and the cost of renovation.

[0020] Fourth, this utility model offers excellent ease of construction. The column cap is positioned on the roof, providing ample operating space. The conventional anchor bolt connection method makes construction simple and easy. Furthermore, a reliable connection is achieved through partial chiseling and grouting, demonstrating a mature construction process.

[0021] V. The structure of this utility model is simple and reasonable. The entire connection structure is composed of basic components such as column caps, closed stirrups, and anchor bolts. The structure is clear, the stress is well-defined, and it is easy to design and implement. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the appearance structure of one embodiment of the present utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of one embodiment of the present invention;

[0024] Figure 3 for Figure 1 and Figure 2 A schematic diagram of the combined view of the structure;

[0025] Figure 4 This is a schematic plan view of the present invention;

[0026] In the diagram: 1. Column cap; 2. Vertical stirrups; 3. Horizontal stirrups; 4. Column cap tie bars; 5. Anchor bolts; 6. New steel structure; 7. Shear groove; 8. Existing structural beams. Detailed Implementation

[0027] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] The column cap connection structure for adding steel structure to the roof of an existing building provided by this utility model includes a column cap 1 set at the beam-column joint of the existing building. The column cap 1 is connected to the column of the existing building. A closed stirrup is embedded in the column cap 1. The closed stirrup wraps around the beam end of the existing structural beam 8. An anchor bolt 5 is also embedded in the column cap 1. The newly added steel structure 6 is connected to the column cap 1 through the anchor bolt 5.

[0030] The closed stirrups include vertical stirrups 2 and horizontal stirrups 3. The vertical stirrups 2 pass through the existing building beams and are bent into a closed shape. Specifically, after passing through the original beams, the vertical stirrups 2 are bent into a rectangular shape and welded into a closed shape using single-sided or double-sided welding to ensure the formation of a complete stress loop. The horizontal stirrups 3 are tied to the vertical stirrups 2 to form a stable steel reinforcement skeleton.

[0031] To further enhance the reliability of the connection, column cap tie bars 4 are also provided. The column cap tie bars 4 pass through the existing structural beam 8 and connect the vertical stirrups 2 and the horizontal stirrups 3. In specific implementation, horizontal holes are drilled in the original beam, and the column cap tie bars 4 are passed through the original beam to connect the vertical stirrups 2 and the horizontal stirrups 3 on both sides, forming an integral steel reinforcement network.

[0032] The connection between the column cap 1 and the top of the existing building column is achieved by roughening. During construction, the original beam sides and bottom in the beam-column joint area are roughened, and the shear groove 7 is removed to increase the contact area and roughness, ensuring reliable bonding between the new and old concrete.

[0033] The column cap 1 is formed by casting grout. The grout has the characteristics of good fluidity, high strength and low shrinkage, which can fully fill the space of the formwork and form a good integrity with the original structure.

[0034] Depending on the specific engineering requirements, a sliding layer can be installed between the newly added steel structure 6 and the column cap 1 to achieve a sliding connection. The sliding layer can be made of materials with good sliding properties, such as polytetrafluoroethylene (PTFE) sheets or stainless steel sheets, enabling the steel structure to undergo slight horizontal displacement to adapt to temperature changes and structural deformation.

[0035] To improve the shear resistance of column capital 1, shear-resistant members can be installed inside column capital 1. These shear-resistant members can be reinforced steel bars, steel plates, or other components with good shear resistance, and their configuration depends on the load size and safety requirements.

[0036] The key function of closed stirrups is to completely enclose the beam ends at the beam-column joint of the existing building, establishing an effective force transmission mechanism. When the newly added steel structure 6 generates upward tension, this tension is transmitted to the column cap 1 through the anchor bolts 5. The upward tension of the column cap 1 is then transmitted to the existing structural beam 8 through the closed stirrups, and then to the beam-column joint through the existing structural beam 8, and finally to the column, realizing a complete force transmission path and ensuring structural safety.

[0037] The anchor bolts 5 allow for various connection methods between the steel column base and column cap 1, including rigid, hinged, and sliding connections. With a rigid connection, the steel structure and column cap 1 form a unified whole, sharing the bending moment and axial force. With a hinged connection, only axial force is transmitted, not bending moment. With a sliding connection, horizontal slight movement is allowed while vertical force is transmitted. The advantage of this connection structure is that the entire load of the new steel structure 6 is directly transferred to the existing building's columns, bypassing the roof slab structure, thus eliminating the need for reinforcement of the original beams and slabs. When using hinged or sliding connections, the load of the new steel structure 6 is transmitted to the column as axial force, without increasing the bending moment of the column, therefore the column itself does not require reinforcement.

[0038] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent transformations or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A column cap connection structure for adding steel structure to the roof of an existing building, characterized in that: The column cap is installed at the beam-column joint of the existing building. The column cap is connected to the column of the existing building. The column cap is equipped with closed stirrups that wrap around the beam end of the existing building. Anchor bolts are also installed in the column cap. The new steel structure is connected to the column cap through the anchor bolts.

2. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 1, characterized in that: The closed stirrups include vertical stirrups and horizontal stirrups. The vertical stirrups pass through the beams of the existing building and are bent into a closed shape. The horizontal stirrups are tied to the vertical stirrups.

3. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 2, characterized in that: It also includes column cap tie bars, which pass through the beams of the existing building and connect the vertical stirrups and the horizontal stirrups.

4. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 1, characterized in that: The column cap is connected to the top of the existing building's column by roughening the surface.

5. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 1, characterized in that: The column cap is formed by casting with grout.

6. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 1, characterized in that: A sliding layer is provided between the newly added steel structure and the column cap.

7. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 1, characterized in that: The column cap is equipped with a shear-resistant component.

8. The column cap connection structure for adding steel structure to the roof of an existing building according to claim 1, characterized in that: The closed stirrups completely enclose the beam ends at the beam-column joints of the existing building, and are used to transfer the upward tensile force of the column caps to the beams, beam-column joints and columns of the existing building.

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