A connection joint of a foundation pit stand and a support beam

Abstract

The utility model provides a kind of connecting joint of foundation pit stand and support beam, it includes the support beam being arranged horizontally, the buttress being connected with the support beam from downside and the stand being connected with the buttress from downside, the support beam includes the first pouring main body formed of concrete, the buttress includes the second pouring main body formed of concrete, the first pouring main body is integrally connected with the second pouring main body, steel reinforcement framework is provided in the second pouring main body, the upper end height of the stand is lower than the downside edge of the first pouring main body and higher than the downside edge of the second pouring main body, the upper end of the stand is embedded into the second pouring main body to be fixedly connected with the buttress.The utility model connects support beam and height low stand into a whole by concrete buttress, concrete buttress and concrete support beam can be synchronously integrally poured, construction is more convenient, and the connection integrity between support beam and stand is better, and node rigidity is large.

Description

Technical Field

[0001] This utility model relates to the field of building engineering, specifically to a connection node between a foundation pit column and a support beam. Background Technology

[0002] Urban underground space development generates numerous deep foundation pit projects. In soft soil areas, the support structure for deep foundation pits typically consists of a retaining system and a support system. The support system often employs a combination of horizontal reinforced concrete support beams and vertical support columns. During horizontal support construction, the top of the column is embedded in the concrete support beam, cast together with it, thus sharing the load and self-weight of the support system with the column pile. To ensure a reliable connection between the column and the support beam, as well as reliable load transfer and the safety of the support system, the upper end of the column needs to be embedded in the support beam for a certain length. Shear-resistant members may also be necessary. However, due to issues with construction control precision and operational errors, situations frequently occur where the top of the steel column is lower than the support beam. Therefore, how to take effective measures to ensure a reliable connection between the column and the support beam becomes a common challenge in engineering projects.

[0003] In existing construction methods, low-lying columns are typically repaired by welding to raise them, but this presents challenges such as difficulty in controlling welding quality on-site and inconvenience in construction operations. Especially when the supporting beam also serves as a construction trestle, the columns bear a large vertical load, and the reliability of their connection to the supporting beam directly impacts project safety. Therefore, finding a convenient and reliable way to address the issue of low-lying steel columns is crucial to ensuring a reliable connection between the steel columns and the supporting beam. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a connection node between a foundation pit column and a support beam. This connection node enables a reliable connection between the column and the support beam even when the column top is too low to be anchored into the support beam.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A connection node between a foundation pit column and a support beam includes a horizontally arranged support beam, a pier connected to the support beam from below, and a column connected to the pier from below. The support beam includes a first concrete casting body, and the pier includes a second concrete casting body. The first casting body and the second casting body are integrally connected. A steel reinforcement cage is provided in the second casting body. The upper end of the column is lower than the lower edge of the first casting body and higher than the lower edge of the second casting body. The upper end of the column is embedded in the second casting body to be fixedly connected to the pier.

[0006] Furthermore, the width of the support beam is the same as the width of the pier, and the two sides of the support beam in the width direction are flush with the two sides of the pier in the width direction.

[0007] Furthermore, the cross-section of the support is square or rectangular.

[0008] Furthermore, the steel reinforcement cage includes several main bars and several stirrups. Each main bar includes two vertical bars, and the lower ends of the two vertical bars are connected by a horizontal bar. The stirrups are in a horizontal ring structure, and the vertical bars are connected and fixed to the stirrups.

[0009] Furthermore, the upper end of the vertical reinforcing bar is anchored into the first cast-in-place body.

[0010] Furthermore, the column includes multiple vertically arranged steel column units, which are fixedly connected to each other by connectors.

[0011] Furthermore, the steel reinforcement cage includes several main reinforcement bars arranged along the x-direction and several main reinforcement bars arranged along the y-direction. The transverse reinforcement bars of the main reinforcement bars arranged along the x-direction and the transverse reinforcement bars of the main reinforcement bars arranged along the y-direction are interwoven to form several grids. The steel column unit passes through the grids and is anchored into the second cast-in-place body.

[0012] Furthermore, the column includes four steel column units, each steel column unit comprising two column plates connected at right angles to each other, the four steel column units being arranged in a rectangular structure, and the connector fixingly connecting the parallel column plates of two adjacent steel column units.

[0013] Furthermore, the connector includes an annular inner connecting rib welded and fixed to the inner side of the column plate and an outer connecting plate welded and fixed to the outer side of the column plate.

[0014] The following beneficial effects can be achieved by applying this utility model: 1. This utility model connects the support beam and the low-height column into one unit by setting a concrete pier on the lower side of the support beam. The concrete pier is equipped with a steel reinforcement cage. Compared with the existing solution of welding the column, the concrete pier and the concrete support beam of this utility model can be poured as a whole at the same time, which is more convenient for construction. Moreover, the connection between the support beam and the column has good integrity and high node rigidity. On the one hand, it can ensure the reliable transmission of the load on the support beam to the column, and on the other hand, it provides rigid constraint on the top of the steel column, improving the stability and safety of the steel column.

[0015] 2. In solving the problem of low column height, this utility model does not adopt a welding repair scheme. Instead of directly embedding the column into the support beam, it is connected to the support beam by embedding it into the pier. The column connection process only needs to consider the structural cooperation with the steel reinforcement skeleton in the concrete pier. The setting method of the steel reinforcement structure in the support beam does not affect the connection of the column. Therefore, the structural design of the support beam and the column is more flexible and the construction is more convenient. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the present utility model; Figure 2 for Figure 1 A front view of the embodiment shown; Figure 3 This is a schematic diagram of the column structure in one implementation method; Figure 4 This is a schematic diagram of the column structure in another embodiment; Figure 5 This is a schematic diagram of the steel reinforcement cage in one embodiment; In the diagram, 1-support beam, 11-first casting main body, 12-beam side, 2-pier, 21-second casting main body, 22-reinforcement cage, 221-vertical reinforcement, 222-transverse reinforcement, 223-stirrups, 224-grid, 23-pier side, 3-column, 31-steel column unit, 311-column plate, 32-connector, 321-outer connecting plate, 322-inner connecting bar. Detailed Implementation

[0017] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0018] Reference Figure 1 and Figure 2 One embodiment of this utility model provides a connection node between a foundation pit column and a support beam, which includes a horizontally arranged support beam 1, a pier 2 connected to the support beam 1 from the lower side, and a column 3 connected to the pier 2 from the lower side. Specifically: The supporting beam 1 includes a first cast-in-place body 11 formed of concrete. In this embodiment, the first cast-in-place body has a cuboid shape. Typically, in order to improve the mechanical properties of the supporting beam, a steel reinforcement structure is set inside the first cast-in-place body. Since this embodiment does not involve direct improvement of the supporting beam, the internal details of the supporting beam will not be described in detail.

[0019] The support pier 2 includes a second concrete casting body 21, inside which a steel reinforcement skeleton 22 is provided. The second casting body 21 and the first casting body 11 are cast simultaneously during construction, forming an integral structure. The shape and size of the support pier 2 can be adjusted as needed. The cross-section of the support pier can be set as circular, square, rectangular, etc. When the cross-section of the support pier is square or rectangular, in some embodiments, the width of the support pier 2 is equal to that of the supporting beam 1, so that the two beam sides 12 of the supporting beam 1 are... The two support sides 23 of the support pier 2 are flush with each other. In other embodiments, the width of the support pier can also be smaller than that of the support beam. In this case, a stepped structure is formed between the beam side 12 and the support side 23. For the convenience of formwork during construction, it is usually preferred to make the beam side 12 and the support side 23 flush with each other. Taking an application project as an example: the support beam is 800mm wide, the top of the steel column is 200mm lower than the bottom of the support beam, the cross section of the support pier is designed as a square, and the side length is the same as the width of the support beam, which is 800mm. In order to ensure that the steel column is embedded in the support pier by no less than 500mm, the height of the support pier is designed to be 700mm. The steel reinforcement cage 22 includes several main bars and several stirrups. Each main bar contains two vertical bars 221. The lower ends of the two vertical bars are connected by a horizontal bar 222, making the main bar U-shaped. The main bars can be formed by bending a single bar or by welding two L-shaped bars. The stirrups 223 are horizontal ring structures. The vertical bars 221 are connected and fixed to the stirrups 223. The stirrups 223 form a fixed connection between multiple main bars. The specifications, spacing and quantity of the main bars and stirrups can be determined according to the bearing requirements of the pier. In this embodiment, some main bars are set along the x-direction and other main bars are set along the y-direction, so that the horizontal bars 222 of multiple main bars are arranged in a crisscross pattern and form several grids 224. To further enhance the connection strength between the support beam 1 and the pier 2, the upper part of the vertical steel bar 221 can be extended into the support beam 1, and the length of the extended part can be determined according to the anchorage requirements.

[0020] The column 3 includes multiple vertically arranged steel column units 31, which are fixedly connected by connectors 32. The upper end of the column is anchored into the second cast-in-place body 21 and located below the first cast-in-place body 11. Since the reinforcing steel frame forms a grid 224, the upper end of the steel column unit 31 can pass through the grid 224 and extend to the middle of the reinforcing steel frame 22. This utilizes the reinforcing steel frame 22 to strengthen the anchorage strength between the steel column unit 31 and the pier 2, as well as the reliability of load transfer. In this embodiment, there are four steel column units 31, each formed by two right-angled column plates 311. The four steel column units are arranged in a rectangular pattern. The column plates of two adjacent steel column units are connected to each other, thereby forming a single structure of four steel column units. This embodiment also provides two specific connection methods between the steel column units. In the first embodiment, the steel column units are fixedly connected by a connecting plate 321, which is fixedly connected to the outer side of the column plate 311. In the second embodiment, the steel column units are fixedly connected by an inner connecting rib 322, which has a ring structure. The inner side of the column plate 311 is fixedly connected to the inner connecting rib 322. In the third embodiment, the connector 32 includes both a connecting plate 321 and a connecting rib 322, and is connected to the steel column unit in the above manner.

[0021] Another embodiment of this utility model provides a construction method for the above-mentioned connection node, which may include the following steps: S1: Measure the distance between the top of the column and the support beam, and determine the height of the support pier based on the column embedment requirements; determine the cross-sectional dimensions of the support pier based on the dimensions of the support beam; determine the specifications of the support pier reinforcement cage configuration based on the load borne by the support pier. S2: The formwork and steel reinforcement cage of the support piers are constructed simultaneously with the construction of the support beam; S3: The concrete for the support pier is poured simultaneously with the concrete for the support beam, and the top of the column and the support beam are integrated through the pouring of the support pier.

[0022] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A connection node between a foundation pit column and a supporting beam, characterized in that: The structure includes a horizontally arranged support beam (1), a support pier (2) connected to the support beam (1) from the bottom, and a column (3) connected to the support pier (2) from the bottom. The support beam (1) includes a first concrete casting body (11), and the support pier includes a second concrete casting body (21). The first casting body (11) and the second casting body (21) are integrally connected. A steel reinforcement skeleton (22) is provided in the second casting body (21). The upper end of the column (3) is lower than the lower edge of the first casting body (11) and higher than the lower edge of the second casting body (21). The upper end of the column (3) is embedded in the second casting body (21) and thus fixedly connected to the support pier (2).

2. The connection node between the foundation pit column and the support beam according to claim 1, characterized in that: The width of the support beam (1) is the same as the width of the pier (2), and the two beam sides (12) of the support beam (1) in the width direction are flush with the two pier sides (23) of the pier (2) in the width direction.

3. The connection joint of claim 1, wherein: The cross-section of the support (2) is square or rectangular.

4. The connection joint of claim 1, wherein: The steel reinforcement cage (22) includes several main bars and several stirrups (223). Each main bar includes two vertical bars (221). The lower ends of the two vertical bars (221) are connected by a horizontal bar (222). The stirrups (223) are in a horizontal ring structure. The vertical bars (221) are connected and fixed to the stirrups (223).

5. The connection joint of claim 4, wherein: The upper end of the vertical steel bar (221) is anchored into the first cast-in-place body (11).

6. The connection joint of claim 4, wherein: The column (3) includes multiple vertically arranged steel column units (31), which are fixedly connected to each other by connectors (32).

7. The connection node between the foundation pit column and the support beam according to claim 6, characterized in that: The steel reinforcement cage (22) includes several main bars arranged along the x direction and several main bars arranged along the y direction. The transverse bars (222) of the main bars arranged along the x direction and the transverse bars (222) of the main bars arranged along the y direction are intersected to form several grids (224). The steel column unit (31) passes through the grid and is anchored into the second casting body (21).

8. The connection node between the foundation pit column and the support beam according to claim 6, characterized in that: The column (3) includes four steel column units (31), each steel column unit (31) includes two column plates (311) connected at right angles to each other. The four steel column units (31) are arranged in a rectangular structure. The connector (32) fixes the parallel column plates (311) of two adjacent steel column units (31) together.

9. The connection node between the foundation pit column and the support beam according to claim 6, characterized in that: The connector (32) includes an annular inner connecting rib (322) welded and fixed to the inner side of the column plate (311) and an outer connecting plate (321) welded and fixed to the outer side of the column plate (311).

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