Embedded type steel column base joint
By setting a combined structure of upper bearing plate, lower bearing plate and external stiffening rib plate in the column base node of steel column, the problem of large foundation depth of embedded steel column base node is solved, and the effect of high bearing capacity and low construction cost is achieved.
Patent Information
- Application Number
- CN202520197694.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-08
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-08
AI Technical Summary
The existing embedded steel column base joints have large foundation depths, which leads to construction difficulties, high costs, and poor economic efficiency.
The structure employs a concrete foundation and steel columns. The steel columns are fitted with an upper and a lower bearing plate. The upper bearing plate is located inside the upper part of the concrete foundation, while the lower bearing plate is located below the upper bearing plate and has a smaller lateral area. Multiple external stiffening ribs are installed between the two, and these ribs are evenly distributed along the circumference of the steel column and fixedly connected to it, forming a high-strength truncated cone. The vertical punching load is transferred to the concrete foundation through the upper and lower bearing plates and the external stiffening ribs.
It achieves sufficient load-bearing capacity, with a small concrete foundation thickness, minimal excavation, low construction difficulty, and low cost.
Smart Images
Figure CN223766969U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel column technology, specifically to an embedded steel column base joint. Embedded Steel Column Base Joint Background Technology
[0002] Concrete-filled steel tubular structures are now widely used in high-rise buildings, with steel columns being particularly prevalent due to their high load-bearing capacity. Existing connection methods between steel columns and foundations include enclosed, exposed, and embedded types. Embedded types are more commonly used because they reliably transfer bending moments, axial forces, and shear forces without requiring additional space.
[0003] Commonly used embedded column base joints for steel columns, through a certain embedment depth, feature end plates and stiffening ribs at the bottom, and densely packed studs on the sides, collectively transferring the axial force, bending moment, and other internal forces of the steel column to the foundation. There are two common force transmission modes for column bases. One follows the recommendations in the code, with studs installed according to structural requirements; vertical force transmission is solely through the base plate to the foundation, and its failure pattern is as follows... Figure 1 As shown, one approach requires sufficient foundation thickness below the base slab, leading to excessive foundation depth, resulting in large excavation volumes, construction difficulties, and high costs. Another approach considers the force transmission effect of the side studs, where the force transmission from the studs and the base slab works together. In this case, the vertical force transmitted from the base slab to the foundation needs to be reduced, and the failure mode is as follows: Figure 2 As shown, although it is an improvement over the first scheme, the force transmission capacity of the side studs is limited. Most of the load is still transferred to the foundation by the base plate. The foundation below the base plate bears the punching shear load of the steel column, resulting in a very thick foundation below the base plate of the steel column. The foundation depth and excavation volume are still relatively large, resulting in high cost and poor economic efficiency. Utility Model Content
[0004] To address the technical problem of large foundation depth in existing embedded steel column base joints, this utility model provides an embedded steel column base joint with sufficient load-bearing capacity and small vertical dimensions of the vertical stiffening ribs, resulting in a thin concrete foundation, minimal excavation, and low construction difficulty and cost.
[0005] This utility model is achieved through the following technical solution:
[0006] This utility model provides an embedded steel column base node, comprising: a concrete foundation structure, which is constructed in a foundation pit during operation; a steel column body, the lower end of which is inserted into the concrete foundation structure; an upper support plate, which is sleeved on the steel column body and located inside the upper end of the concrete foundation structure; a lower support plate, which is sleeved on the steel column body, located below the upper support plate and within the concrete foundation structure, and the lateral area of the lower support plate is smaller than that of the upper support plate; and multiple external stiffening ribs, which are evenly distributed along the circumference of the steel column body and fixedly connected to the steel column body, with the upper end of each external stiffening rib connected to the upper support plate and the lower end connected to the lower support plate.
[0007] The embedded steel column base joint provided by this utility model includes a concrete foundation structure and a steel column. The steel column is fitted with an upper bearing plate and a lower bearing plate. The upper bearing plate is located inside the upper end of the concrete foundation structure, and the lower bearing plate is located below the upper bearing plate and inside the concrete foundation structure. The lateral area of the lower bearing plate is smaller than that of the upper bearing plate. At the same time, multiple external stiffening ribs are provided between the upper and lower bearing plates. The multiple external stiffening ribs are evenly distributed along the circumference of the steel column and fixedly connected to it. The upper end of each external stiffening rib is connected to the upper bearing plate, and the lower end is connected to the lower bearing plate. Thus, the upper and lower bearing plates form a high-strength truncated cone at the upper end of the steel column section inserted into the concrete foundation structure. The vertical punching shear load of the steel column is transferred to the concrete foundation structure through the upper bearing plate, the lower bearing plate, and the external stiffening ribs to resist punching shear. It can bear the vertical punching shear load of the steel column and has sufficient bearing capacity.
[0008] Meanwhile, the upper bearing plate, lower bearing plate, and external stiffening rib are all connected to the steel column. Even with a short vertical dimension of the external stiffening rib, the truncated cone formed by the three still has sufficient rigidity and load-bearing capacity. Therefore, it can be ensured that the vertical dimension of the vertical stiffening rib is short, resulting in a small thickness of the concrete foundation and a small amount of excavation.
[0009] In summary, the embedded steel column base node provided by this utility model has sufficient load-bearing capacity, and the vertical dimensions of the vertical stiffening ribs are small, the thickness of the concrete foundation is small, and the amount of excavation is small, which makes it easy to construct and cost-effective.
[0010] In an optional embodiment of this application, the upper support plate is a square plate, so that the upper support plate has sufficient size to connect with the reinforcing bars in the top of the concrete foundation structure, so that the upper support plate does not interfere with the reinforcing bars in the top of the concrete foundation structure, and can provide good lateral restraint for the steel column.
[0011] In an optional embodiment of this application, the reinforcing bars inside the top of the concrete foundation structure are fixedly connected to the upper bearing plate to ensure that the upper bearing plate can provide good lateral restraint to the steel column.
[0012] In an optional embodiment of this application, the reinforcing bars inside the top of the concrete foundation structure are welded and fixed to the upper support plate to ensure sufficient connection strength between the reinforcing bars inside the top of the concrete foundation structure and the upper support plate.
[0013] In an optional embodiment of this application, an upper stiffening ring plate is further included. The upper stiffening ring plate is concentrically arranged with the steel column body, the upper stiffening ring plate is located inside the steel column body, and the upper stiffening ring plate is fixedly connected to the steel column body to ensure that the connection between the steel column body and the upper support plate has sufficient structural strength.
[0014] In an optional embodiment of this application, a lower stiffening ring plate is further included. The lower stiffening ring plate is concentrically arranged with the steel column body, the lower stiffening ring plate is located inside the steel column body, and the lower stiffening ring plate is fixedly connected to the steel column body to ensure that the connection between the steel column body and the lower support plate has sufficient structural strength.
[0015] In an optional embodiment of this application, an inner stiffening rib is further included. Multiple inner stiffening ribs are provided, and the multiple inner stiffening ribs are evenly distributed along the circumference of the steel column. The upper end of each inner stiffening rib is connected to the upper stiffening ring plate, and the lower end is connected to the lower stiffening ring plate, so as to ensure that the section of the steel column connected to the frustum formed by the upper bearing plate, the lower bearing plate, and the outer stiffening ribs has sufficient structural strength.
[0016] In an optional embodiment of this application, the inner stiffening rib and the corresponding outer stiffening rib are arranged collinearly to ensure that the inner stiffening rib and the corresponding outer stiffening rib can provide good reinforcement for the steel column.
[0017] In an optional embodiment of this application, a plurality of vertical studs are evenly distributed around the bottom circumference of the lower end of the steel column, and the plurality of vertical studs extend vertically into the concrete foundation structure to ensure that the steel column can stably transfer the vertical force to the concrete foundation structure.
[0018] In an optional embodiment of this application, a plurality of radial studs are vertically spaced on the outer side of the lower end of the steel column. The plurality of radial studs extend radially into the concrete foundation structure along the steel column, so that the force on the steel column is simultaneously transferred to the concrete foundation structure from the side wall and the bottom plate, which can further reduce the thickness of the concrete foundation structure.
[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:
[0020] The embedded steel column base joint provided by this utility model includes a concrete foundation structure and a steel column. An upper bearing plate and a lower bearing plate are fitted onto the steel column. The upper bearing plate is located inside the upper part of the concrete foundation structure, and the lower bearing plate is located below the upper bearing plate and inside the concrete foundation structure. The lateral area of the lower bearing plate is smaller than that of the upper bearing plate. Multiple external stiffening ribs are provided between the upper and lower bearing plates. These external stiffening ribs are evenly distributed along the circumference of the steel column and fixedly connected to it. The upper end of each external stiffening rib is connected to the upper bearing plate, and the lower end is connected to the lower bearing plate. Thus, the steel column is inserted into the concrete foundation through the upper and lower bearing plates. The upper end of the concrete foundation segment forms a high-strength truncated cone. The vertical punching shear load of the steel column is transferred to the concrete foundation through the upper and lower bearing plates and the external stiffening ribs to resist punching shear. It can bear the vertical punching shear load of the steel column and has sufficient load-bearing capacity. At the same time, the upper and lower bearing plates and the external stiffening ribs are all connected to the steel column. Even with a relatively short vertical dimension of the external stiffening ribs, the truncated cone formed by the three still has sufficient rigidity and load-bearing capacity. Therefore, the small vertical dimension of the vertical stiffening ribs results in a small concrete foundation thickness and a small amount of excavation, which has the characteristics of low construction difficulty and low cost. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this utility model and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] In the attached diagram:
[0023] Figure 1 This is a schematic diagram of the structure of related technology 1 in the embodiment of this application;
[0024] Figure 2 This is a schematic diagram of the structure of related technology 2 in the embodiment of this application;
[0025] Figure 3 A cross-sectional structural schematic diagram of the embedded steel column base node provided in the embodiments of this application;
[0026] Figure 4 This is a schematic diagram of the structure in which the upper bearing plate of the embedded steel column base node is connected to the reinforcing bars, as provided in the embodiments of this application.
[0027] The attached figures include reference numerals and their corresponding component names:
[0028] 1-Concrete foundation structure, 2-Steel column, 3-Upper foundation plate, 4-Lower foundation plate, 5-External stiffening rib, 6-Reinforcing bar, 7-Upper stiffening ring plate, 8-Lower stiffening ring plate, 9-Internal stiffening rib, 10-Vertical stud, 11-Radial stud, 12-Existing steel column, 13-Existing concrete foundation, 14-Existing vertical stud, 15-Existing radial stud. Detailed Implementation
[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0030] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0031] It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0032] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of this application is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. It is only for the convenience of describing this application and simplifying the description, and is not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.
[0033] In the description of this application, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0034] Example
[0035] Combination Figure 3This embodiment provides an embedded steel column base joint, comprising: a concrete foundation structure 1, which is constructed in a foundation pit during operation; a steel column 2, the lower end of which is inserted into the concrete foundation structure 1; an upper support plate 3, which is sleeved on the outside of the steel column 2 and located inside the upper end of the concrete foundation structure 1; and a lower support plate 4, which is sleeved on the outside of the steel column 2. The lower support plate 4 is located below the upper support plate 3 and within the concrete foundation structure 1, and the lateral area of the lower support plate 4 is smaller than that of the upper support plate 3; there are multiple external stiffening ribs 5, which are evenly distributed along the circumference of the steel column 2 and fixedly connected to the steel column 2, and the upper end of each external stiffening rib 5 is connected to the upper support plate 3 and the lower end is connected to the lower support plate 4.
[0036] Specifically, the upper bearing plate 3, the lower bearing plate 4, and the outer stiffening rib 5 are all welded to the steel column body 2 to ensure that the punching shear cone formed by the upper bearing plate 3, the lower bearing plate 4, and the outer stiffening rib 5 has sufficient structural strength, and to ensure that the punching shear cone and the steel column body 2 have sufficient connection strength.
[0037] Combination Figure 4 The upper support plate 3 is a square plate, so that the upper support plate 3 has sufficient size to connect with the steel bars 6 in the top of the concrete foundation structure 1, so that the upper support plate 3 does not interfere with the steel bars 6 in the top of the concrete foundation structure 1, and can provide good lateral restraint for the steel column 2.
[0038] Correspondingly, the reinforcing bars 6 inside the top of the concrete foundation structure 1 are fixedly connected to the upper support plate 3 to ensure that the upper support plate 3 can provide good lateral restraint for the steel column 2.
[0039] It is understood that the reinforcing bars 6 inside the top of the concrete foundation structure 1 are welded and fixed to the upper support plate 3 to ensure sufficient connection strength between the reinforcing bars 6 inside the top of the concrete foundation structure 1 and the upper support plate 3.
[0040] Based on this, this embodiment also includes an upper stiffening ring plate 7, which is concentrically arranged with the steel column body 2. The upper stiffening ring plate 7 is located inside the steel column body 2 and is fixedly connected to the steel column body 2 to ensure that the connection between the steel column body 2 and the upper support plate 3 has sufficient structural strength.
[0041] Furthermore, this embodiment also includes a lower stiffening ring plate 8, which is concentrically arranged with the steel column body 2. The lower stiffening ring plate 8 is located inside the steel column body 2 and is fixedly connected to the steel column body 2 to ensure that the connection between the steel column body 2 and the lower support plate 4 has sufficient structural strength.
[0042] It should be noted that this embodiment also includes internal stiffening ribs 9. Multiple internal stiffening ribs 9 are provided, and the multiple internal stiffening ribs 9 are evenly distributed along the circumference of the steel column body 2. The upper end of each internal stiffening rib 9 is connected to the upper stiffening ring plate 7, and the lower end is connected to the lower stiffening ring plate 8, so as to ensure that the section of the steel column body 2 connected to the frustum formed by the upper support plate 3, the lower support plate 4 and the external stiffening ribs 5 has sufficient structural strength.
[0043] Combined again Figure 4 The inner stiffening rib 9 and the corresponding outer stiffening rib 5 are arranged collinearly to ensure that the inner stiffening rib 9 and the corresponding outer stiffening rib 5 can effectively reinforce the steel column body 2.
[0044] It is known that the bottom circumference of the lower end of the steel column 2 is evenly distributed with a plurality of vertical studs 10, and the plurality of vertical studs 10 extend vertically into the concrete foundation structure 1 to ensure that the steel column 2 can stably transmit the vertical force to the concrete foundation structure 1.
[0045] Meanwhile, in this embodiment, a plurality of radial studs 11 are vertically spaced on the outer side of the lower end of the steel column 2. The plurality of radial studs 11 extend radially into the concrete foundation structure 1 along the steel column 2, so that the force on the steel column 2 is simultaneously transferred to the concrete foundation structure 1 by the side wall and the bottom plate, which can further reduce the thickness of the concrete foundation structure 1.
[0046] In summary, the embedded steel column base node provided in this embodiment has an upper bearing plate 3 located inside the upper end of the concrete foundation structure 1, and a lower bearing plate 4 located below the upper bearing plate 3 and inside the concrete foundation structure 1. The lateral area of the lower bearing plate 4 is smaller than that of the upper bearing plate 3. Multiple external stiffening ribs 5 are provided between the upper bearing plate 3 and the lower bearing plate 4. These external stiffening ribs 5 are evenly distributed along the circumference of the steel column body 2 and fixedly connected to it. The upper end of each of the five sections is connected to the upper bearing plate 3, and the lower end is connected to the lower bearing plate 4. Thus, the upper bearing plate 3 and the lower bearing plate 4 form a high-strength truncated cone at the upper end of the section of the steel column 2 inserted into the concrete foundation structure 1. The vertical punching shear load of the steel column 2 is transferred to the concrete foundation structure 1 through the upper bearing plate 3, the lower bearing plate 4 and the external stiffening rib plate 5 to resist punching shear. It can bear the vertical punching shear load of the steel column 2 and has sufficient bearing capacity.
[0047] Meanwhile, the upper bearing plate 3, the lower bearing plate 4, and the outer stiffening rib plate 5 are all connected to the steel column body 2. Even with a short vertical dimension of the outer stiffening rib plate 5, the truncated cone formed by the three still has sufficient rigidity and load-bearing capacity. Therefore, it can be ensured that the vertical dimension of the vertical stiffening rib is short, resulting in a small thickness of the concrete foundation and a small amount of excavation.
[0048] In summary, the embedded steel column base node provided in this embodiment has sufficient load-bearing capacity, and the vertical dimensions of the vertical stiffening ribs are small, the thickness of the concrete foundation is small, and the excavation volume is small, which has the characteristics of low construction difficulty and low cost.
[0049] It should be understood that the aforementioned steel column body can be a circular steel pipe column (concrete-filled steel pipe column), a rectangular steel pipe column (concrete-filled steel pipe column), or an H-shaped steel column.
[0050] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A recessed steel column base joint, characterized by, It includes: Concrete base structure (1), which is built in the foundation pit in the working state; Steel column body (2), the lower end of which is inserted into the concrete base structure (1); Upper bearing platform (3), which is sleeved outside the steel column body (2), and the upper bearing platform (3) is located in the upper end of the concrete base structure (1); Lower bearing platform (4), which is sleeved outside the steel column body (2), the lower bearing platform (4) is located below the upper bearing platform (3) and in the concrete base structure (1), and the transverse area of the lower bearing platform (4) is smaller than that of the upper bearing platform (3); Additional stiffened rib plate (5), which is provided with multiple, multiple additional stiffened rib plates (5) are uniformly distributed along the circumference of the steel column body (2) and fixedly connected with the steel column body (2), and the upper end of each additional stiffened rib plate (5) is connected with the upper bearing platform (3), and the lower end is connected with the lower bearing platform (4).
2. The embedded steel column base joint according to claim 1, wherein The upper bearing platform (3) is a square plate.
3. The embedded steel column base joint according to claim 2, wherein The reinforcing steel bars (6) in the top of the concrete base structure (1) are fixedly connected with the upper bearing platform (3).
4. The embedded steel column base joint according to claim 3, wherein The reinforcing steel bars (6) in the top of the concrete base structure (1) are fixedly connected with the upper bearing platform (3).
5. The embedded steel column base joint according to claim 1, wherein It also includes an upper stiffened ring plate (7) which is concentrically arranged with the steel column body (2), the upper stiffened ring plate (7) is located in the steel column body (2), and the upper stiffened ring plate (7) is fixedly connected with the steel column body (2).
6. The embedded steel column base joint according to claim 5, wherein It also includes a lower stiffened ring plate (8) which is concentrically arranged with the steel column body (2), the lower stiffened ring plate (8) is located in the steel column body (2), and the lower stiffened ring plate (8) is fixedly connected with the steel column body (2).
7. The embedded steel column base joint according to claim 6, wherein It also includes an inner stiffened rib plate (9), which is provided with multiple, multiple inner stiffened rib plates (9) are uniformly distributed along the circumference of the steel column body (2), and the upper end of each inner stiffened rib plate (9) is connected with the upper stiffened ring plate (7), and the lower end is connected with the lower stiffened ring plate (8).
8. The embedded steel column base joint according to claim 7, wherein The inner stiffened rib plate (9) is arranged in line with the corresponding additional stiffened rib plate (5).
9. The embedded steel column base joint according to any one of claims 1 to 8, wherein The lower end of the steel column body (2) is uniformly distributed with multiple vertical dowels (10) which vertically extend into the concrete base structure (1).
10. The embedded steel column base joint according to claim 9, wherein The outer side of the lower end of the steel column body (2) is vertically spaced with multiple radial dowels (11) which extend into the concrete base structure (1) along the radial direction of the steel column body (2).