A column cap structure for supporting steel bars and lattice columns in concrete

Abstract

The utility model relates to the technical field of foundation pit support engineering, and disclose a kind of column cap structure for concrete inner support reinforcement and lattice column, comprising: lattice column, as vertical support component, one side of lattice column is also equipped with adjacent panel;Concrete inner support beam, setting in lattice column top, for bearing horizontal direction load;Reinforced concrete column cap, between lattice column top and concrete inner support beam bottom, the horizontal section size of reinforced concrete column cap is greater than the section size of lattice column, and the reinforcement of concrete inner support beam is provided with avoidance space;Bottom main reinforcement.The utility model, by setting the horizontal section size significantly greater than the reinforced concrete column cap of lattice column, provides sufficient avoidance space for inner support beam reinforcement, so that it can be continuously arranged, without cutting off or welding reinforcement, fundamentally guarantee the structural integrity and force transmission reliability of node area.

Description

Technical Field

[0001] This utility model relates to the field of foundation pit support engineering technology, specifically a column cap structure for supporting steel bars and lattice columns within concrete. Background Technology

[0002] In deep foundation pit engineering, the internal support system is an important structure to ensure the stability of the foundation pit and control deformation. This system is usually composed of horizontal concrete internal support beams and lattice steel columns as vertical support members. The connection node between the top of the lattice column and the concrete internal support beam is the key part for transmitting vertical loads and horizontal forces. The reliability of the connection and the convenience of construction are directly related to the safety and economy of the entire support system.

[0003] In implementing the above solution, the applicant discovered that the traditional connection method commonly used in the industry is to directly connect the main reinforcement bars of the concrete internal support beam to the lattice column. There are typically two approaches: one is to attempt to pass the main reinforcement bars of the beam through the gaps in the lacing plates of the lattice column; the other is, when the main reinforcement bars cannot pass through, to bend them and weld them to the angle steel flange of the lattice column. However, these approaches lead to severe spatial conflicts. The lattice column itself is composed of angle steel and lacing plates, and its cross-section occupies a large space. Meanwhile, the main reinforcement bars of the concrete internal support beam are usually large in diameter and densely arranged, making them highly susceptible to colliding with the angle steel or lacing plates when passing through the joint area of ​​the lattice column. Due to spatial conflicts, construction often forces the main reinforcing bars, which should be continuous, to be cut off or bent in ways not required by the design. This destructive treatment of the main load-bearing reinforcing bars severely disrupts the force transmission path of the concrete beam, making the joint area a weak link in the overall structure. At the same time, workers often need to spend a lot of time on-site repeatedly adjusting and bending the reinforcing bars. This practice not only damages the load-bearing capacity of the lattice column itself, but also delays the construction period and increases costs. Based on this, this utility model designs a column cap structure for the internal support reinforcing bars of the concrete and the lattice column to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a column cap structure for internal support of steel bars and lattice columns in concrete, which solves the problems of force transmission path disruption and efficiency reduction in concrete beams in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A column cap structure for reinforced concrete and lattice columns includes: a lattice column as a vertical support member, with adjacent gusset plates installed on one side of the lattice column; a reinforced concrete internal support beam disposed at the top of the lattice column to bear horizontal loads; a reinforced concrete column cap disposed between the top of the lattice column and the bottom of the reinforced concrete internal support beam, wherein the horizontal cross-sectional dimension of the reinforced concrete column cap is larger than the cross-sectional dimension of the lattice column, providing clearance space for the reinforcement of the reinforced concrete internal support beam; a bottom main reinforcement bar installed at the bottom of the reinforced concrete column cap, with both ends anchored into the reinforced concrete internal support beam and the top bent outwards; and horizontal reinforcement bars disposed in the middle of the reinforced concrete column cap, penetrating the gap between adjacent gusset plates.

[0006] Preferably, the horizontal cross-sectional shape of the reinforced concrete column cap is rectangular, and the side length is twice the side length of the lattice column cross-section.

[0007] Preferably, the bottom main reinforcement bars are arranged in multiple sets in a linear array in both longitudinal and transverse directions, the length of the bottom main reinforcement bars anchored into the concrete supporting beam is not less than 150mm, and the length of the bottom main reinforcement bars bent outward from the top end is greater than 15 times the diameter of the bottom main reinforcement bars.

[0008] Preferably, the horizontal reinforcing bars are arranged in multiple layers within the height range of the middle of the reinforced concrete column cap and form a reinforcing mesh structure along the longitudinal and transverse directions, and the horizontal reinforcing bars maintain a net distance of more than 25mm from the angle steel of the lattice column.

[0009] Preferably, the concrete strength grade of the reinforced concrete column cap is not lower than C35, and the cross-sectional dimensions of the reinforced concrete column cap can be adjusted according to the specifications of the lattice column.

[0010] Preferably, the angle steel surface of the lattice column is provided with shear studs to enhance the force transmission performance at the interface, and the vertical spacing of the steel mesh structure is less than one-third of the height of the reinforced concrete column cap.

[0011] Compared with the prior art, the beneficial effects achieved by this utility model are: 1. This utility model provides ample clearance for the reinforcement bars of the internal support beam by setting a reinforced concrete column cap with a horizontal cross-sectional dimension significantly larger than that of the lattice column, enabling them to be arranged continuously without cutting or welding reinforcement, thus fundamentally ensuring the structural integrity and force transmission reliability of the node area.

[0012] 2. This utility model forms an effective force transmission mechanism by bidirectional through-and-through anchoring of the bottom main reinforcement and through-and-through horizontal distribution reinforcement in the gap of the lacing plate. The bottom main reinforcement reliably transmits the tensile force at the beam end to the column cap, while the horizontal distribution reinforcement enhances the bonding force and shear resistance of the steel-concrete interface through the interlocking connection with the lacing plate of the lattice column. The column cap structure provides a wide operating space for reinforcement binding, and workers do not need to adjust or cut on site, thus reducing the time required for reinforcement binding. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of this utility model; Figure 3 This utility model Figure 2 Enlarged view of point A; Figure 4 This is a partial sectional view of the present invention.

[0014] The components include: 1. Lattice column; 2. Reinforced concrete column cap; 3. Concrete internal support beam; 4. Bottom main reinforcement; 5. Horizontal reinforcement; 6. Adjacent gusseted slabs. Detailed Implementation

[0015] 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.

[0016] Please refer to Figures 1-3 A column cap structure for reinforced concrete internal support and lattice columns includes: a lattice column 1, serving as a vertical support member, with adjacent connecting plates 6 installed on one side of the lattice column 1; a reinforced concrete internal support beam 3, located at the top of the lattice column 1, for bearing horizontal loads; a reinforced concrete column cap 2, located between the top of the lattice column 1 and the bottom of the reinforced concrete internal support beam 3, the horizontal cross-sectional dimension of the reinforced concrete column cap 2 being larger than the cross-sectional dimension of the lattice column 1, providing clearance space for the reinforcement of the reinforced concrete internal support beam 3; a bottom main reinforcement 4, installed at the bottom of the reinforced concrete column cap 2, with both ends anchored into the reinforced concrete internal support beam 3 and the top bent outwards; and horizontal reinforcement 5, located in the middle of the reinforced concrete column cap 2, penetrating the gap between adjacent connecting plates 6.

[0017] The horizontal cross-sectional shape of the reinforced concrete column cap 2 is rectangular, and the side length is twice the side length of the cross-section of the lattice column 1.

[0018] The bottom main reinforcement 4 is arranged in multiple sets in both longitudinal and transverse directions and is distributed in a linear array. The length of the bottom main reinforcement 4 anchored into the concrete inner support beam 3 is not less than 150mm. The length of the bottom main reinforcement 4 bent outward from the top end is greater than 15 times the diameter of the bottom main reinforcement 4.

[0019] In this embodiment of the invention, during the construction of the support system within the foundation pit, the lattice column 1 serves as a vertical support member, and its top needs to be connected to the horizontal concrete inner support beam 3. In traditional practices, the main reinforcement bars of the concrete inner support beam 3 are often forced to be cut off or bent due to spatial conflicts with the angle steel or gusset plates of the lattice column 1, weakening the joint strength. The horizontal cross-sectional dimension of the reinforced concrete column cap 2 is larger than that of the lattice column 1, creating an expanded clearance space, allowing the reinforcement bars of the concrete inner support beam 3 to smoothly bypass the angle steel and gusset plates of the lattice column 1 without needing to be cut off or bent beyond design.

[0020] The bottom main reinforcement 4 is installed at the bottom of the reinforced concrete column cap 2, arranged in both longitudinal and transverse directions. Its two ends are anchored into the concrete inner support beam 3, and its top is bent outward. When the concrete inner support beam 3 bears a horizontal load, the bottom main reinforcement 4 transfers the tensile force to the reinforced concrete column cap 2 through the anchoring and bending parts, and further distributes it to the lattice column 1.

[0021] Horizontal reinforcing bars 5 are placed in the middle of the reinforced concrete column cap 2, passing through the gap between adjacent gusset plates 6. The horizontal reinforcing bars 5 tightly connect the reinforced concrete column cap 2 and the lattice column 1, enhancing the overall integrity and ensuring that vertical loads and horizontal forces are effectively transferred to the lattice column 1 through the steel mesh structure.

[0022] Please refer to Figures 1-4 The horizontal reinforcing bars 5 are set in multiple layers within the height range of the middle part of the reinforced concrete column cap 2 and arranged in a steel mesh structure along the longitudinal and transverse directions. The horizontal reinforcing bars 5 and the angle steel of the lattice column 1 maintain a net distance of more than 25mm.

[0023] The concrete strength grade of the reinforced concrete column cap 2 shall not be lower than C35, and the cross-sectional dimensions of the reinforced concrete column cap 2 may be adjusted according to the specifications of the lattice column 1.

[0024] The angle steel surface of the lattice column 1 is provided with shear studs to enhance the force transmission performance at the interface. The vertical spacing of the steel mesh structure is less than one-third of the height of the reinforced concrete column cap 2.

[0025] In this embodiment of the invention, the horizontal cross-sectional shape of the reinforced concrete column cap 2 is rectangular, with a side length set to twice the side length of the lattice column 1. This dimensional design provides more precise clearance space for the reinforcing bars of the concrete internal support beam 3, completely eliminating the risk of conflict.

[0026] The bottom main reinforcement 4 consists of seven 22mm diameter HRB400 steel bars in both the longitudinal and transverse directions. The length of the anchorage into the concrete inner support beam 3 is not less than 150mm, and the top bending length is not less than 15 times the steel bar diameter, i.e., 330mm. This configuration ensures that the bottom main reinforcement 4 has sufficient anchorage strength and ductility under tensile force, effectively transferring the load of the concrete inner support beam 3 to the reinforced concrete column cap 2.

[0027] At least two layers of horizontal reinforcing bars 5 are installed within the middle height range of the reinforced concrete column cap 2. HPB300 steel bars with a diameter of 10mm and a spacing of 150mm are used to form a steel mesh structure. The horizontal reinforcing bars 5 pass through the gaps between adjacent gusset plates 6 of the lattice column 1 and maintain a clear distance of not less than 25mm from the angle steel to avoid direct contact between the reinforcing bars and the steel components and prevent local stress concentration.

[0028] Furthermore, the concrete strength grade of the reinforced concrete column capital 2 is not lower than C35, ensuring the durability and load-bearing capacity of the material. Shear studs can be installed on the surface of the angle steel of the lattice column 1 to further enhance the force transmission performance of the steel-concrete interface. The vertical spacing of the steel mesh structure is less than one-third of the column capital height, ensuring the overall stiffness and shear resistance of the column capital.

[0029] During use and construction, the reinforced concrete column cap 2 and the concrete inner support beam 3 are cast in one piece. During the reinforcement binding process, because the reinforced concrete column cap 2 provides ample space, the reinforcement of the concrete inner support beam 3 can be freely arranged, avoiding conflicts with the lattice column 1, and significantly improving construction efficiency and joint quality.

[0030] 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, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A column cap structure for reinforcing steel bars and lattice columns within concrete, characterized in that, include: A lattice column (1) serves as a vertical support member, and an adjacent gusset plate (6) is also installed on one side of the lattice column (1). Concrete internal support beam (3) is set at the top of lattice column (1) to bear horizontal loads; A reinforced concrete column cap (2) is set between the top of the lattice column (1) and the bottom of the concrete inner support beam (3). The horizontal cross-sectional dimension of the reinforced concrete column cap (2) is larger than the cross-sectional dimension of the lattice column (1), providing clearance space for the reinforcement of the concrete inner support beam (3). The bottom main reinforcement (4) is installed at the bottom of the reinforced concrete column cap (2). The two ends of the bottom main reinforcement (4) are anchored into the concrete inner support beam (3), and the top is bent outward. Horizontal reinforcing bars (5) are placed in the middle of the reinforced concrete column cap (2) and pass through the gap between adjacent gusset plates (6).

2. A column cap structure for reinforcing steel bars and lattice columns within concrete, as described in claim 1, characterized in that: The horizontal cross-sectional shape of the reinforced concrete column cap (2) is rectangular, and the side length is twice the side length of the cross-section of the lattice column (1).

3. A column cap structure for reinforcing steel bars and lattice columns within concrete, as described in claim 1, characterized in that: The bottom main reinforcement (4) is arranged in multiple sets in both longitudinal and transverse directions and is distributed in a linear array. The length of the bottom main reinforcement (4) anchored into the concrete inner support beam (3) is not less than 150mm. The length of the bottom main reinforcement (4) bent outward from the top end is greater than 15 times the diameter of the bottom main reinforcement (4).

4. A column cap structure for reinforcing steel bars and lattice columns within concrete, as described in claim 1, characterized in that: The horizontal reinforcing bars (5) are arranged in multiple layers within the height range of the middle part of the reinforced concrete column cap (2) and are arranged in a steel mesh structure along the longitudinal and transverse directions. The horizontal reinforcing bars (5) and the angle steel of the lattice column (1) maintain a net distance of more than 25mm.

5. A column cap structure for reinforcing steel bars and lattice columns within concrete, as described in claim 1, characterized in that: The concrete strength grade of the reinforced concrete column cap (2) is not lower than C35, and the cross-sectional dimensions of the reinforced concrete column cap (2) can be adjusted according to the specifications of the lattice column (1).

6. The column cap structure according to claim 4, characterized in that: The angle steel surface of the lattice column (1) is provided with shear studs to enhance the force transmission performance at the interface. The vertical spacing of the steel mesh structure is less than one-third of the height of the reinforced concrete column cap (2).

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