Cross section contraction type column foot of basement with steel column inserted downwards

Abstract

The utility model relates to a section contraction type column foot of a basement with steel columns inserted downwards. The section contraction type column foot comprises an upper steel column, an upper steel-reinforced concrete column, a variable-section section and a lower steel-reinforced concrete column from top to bottom. The size of the variable cross-section section is gradually reduced from top to bottom, the section is closed when the column foot is inserted into a basement top plate by the depth of 2.5 b (b is the side length of the bottom face of the upper steel column), and the upper section and the lower section of the steel reinforced concrete column and the periphery of the variable cross-section section are matched and formed through concrete pouring. Compared with the prior art, the sectional area of the column foot is reasonably shrunk, the size and the number of basement parking spaces are increased, and meanwhile the structural stress and construction requirements are met; in addition, the beam top elevations at the two ends of the column foot can be inconsistent, the adaptability is wide, and different building functions and spatial layouts can be met.

Description

Technical Field

[0001] The utility model belongs to the field of structural design and construction, and relates to a cross-section contraction type column foot for inserting a steel column into a basement. Background Art

[0002] In modern construction projects, when the superstructure consists of steel columns or concrete-filled steel tubular columns and the basement is located below, the above-ground steel columns are often inserted one or more stories underground to become steel-reinforced concrete columns to accommodate the humidity and potential corrosion issues of the basement environment. According to the "Code for Design of Composite Structures" (JGJ 138-2016), the concrete cover thickness of steel-reinforced concrete columns must be at least 200mm per side. However, this design results in a larger cross-section of the steel-reinforced concrete columns in the basement, adversely affecting the basement's space utilization.

[0003] To solve this problem, it is necessary to optimize the column foot design so that the cross-section of the basement column is as small as possible while still meeting the requirements of structural safety and durability. Chinese patent CN 206256536 U discloses a fixed node for a steel frame column embedded in a basement. The steel frame column is arranged outside the basement. The basement includes a top plate frame beam. A steel-concrete column is arranged inside the basement. The steel-concrete column includes a steel column and a concrete layer arranged outside the steel column. The diameter of the steel frame column is larger than the diameter of the steel column. The steel frame column is connected to the steel column through a connecting portion embedded in the top plate frame beam. The connecting portion is a frustum structure. The cross-sectional shape of one bottom surface of the connecting portion is the same as and coincides with that of the steel frame column. The cross-sectional shape of the other bottom surface of the connecting portion is the same as and coincides with that of the steel column. However, the height of the connecting portion of the utility model is the same as the beam height. The size of the steel column below the connecting portion is limited by the beam height, and the beam height at both ends must be the same. It is not suitable for the intersection of floor height differences. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the above-mentioned existing technology and provide a cross-section shrinkage column base for a steel column inserted into the basement, thereby reasonably reducing the cross-sectional size of the column, while meeting the structural stress and different building requirements, and increasing the size and number of parking spaces in the basement.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] The utility model provides a cross-section shrinkage column base for inserting a steel column into a basement, comprising an upper steel column, an upper steel-framed concrete column, a variable-section section, and a lower steel-framed concrete column;

[0007] The upper steel column is arranged outside the basement, and the upper steel-framed concrete column, the variable-section section, and the lower steel-framed concrete column are arranged in sequence inside the basement. The upper steel-framed concrete column is vertically arranged above the variable-section section, and the lower steel-framed concrete column is arranged below the variable-section section.

[0008] The variable cross-section segment is a frustum structure that is larger at the top and smaller at the bottom. The top cross-section size of the variable cross-section segment is the same as the cross-section of the upper steel-framed concrete column and the orthographic projection coincides with it. The bottom cross-section size of the variable cross-section segment is the same as the cross-section of the lower steel-framed concrete column and the orthographic projection coincides with it. The cross-section of the upper steel-framed concrete column is larger than that of the lower steel-framed concrete column.

[0009] Furthermore, the variable cross-section section is strongly welded to the internal steel frames of the upper and lower sections of the steel-reinforced concrete column.

[0010] Furthermore, the upper steel-framed concrete column, the variable-section section, and the lower steel-framed concrete column all include an internal steel frame body, a number of bolts welded to the outer wall of the steel frame body, and a concrete protective layer covering the outer periphery.

[0011] Preferably, the thickness of the concrete protective layer is 200-300 mm.

[0012] Preferably, the side slope of the variable cross-section segment is less than or equal to 1:6.

[0013] Furthermore, an upper inner partition is provided inside the connection between the upper steel-framed concrete column and the variable-section segment, and a lower inner partition is provided inside the connection between the lower steel-framed concrete column and the variable-section segment. Concrete pouring holes are provided in the middle of the upper inner partition and the lower inner partition.

[0014] Preferably, the concrete poured into the variable cross-section section is self-compacting concrete.

[0015] Furthermore, the distance from the basement top plate to the upper inner partition plate is (2.5~3)b, where b is the side length of the bottom surface of the upper steel column. When the basement top plate has two elevations, the higher basement top plate is used as the basis for calculating the distance from the basement top plate to the upper inner partition plate.

[0016] Preferably, the bottom surface of the upper steel column and the bottom surfaces of the upper steel-framed concrete column, the variable-section section, and the inner steel frame of the lower steel-framed concrete column are all rectangular or circular.

[0017] Preferably, the beam height of the basement is 800-1100 mm.

[0018] Preferably, the basement top plate elevation is -2 to 0 m, and the basement top plate elevation is aligned with or lower than the elevation of the upper steel-framed concrete column top.

[0019] Preferably, the elevations of the beam tops at both ends of the column foot may be inconsistent to accommodate different building functions and spatial layouts.

[0020] Compared with the prior art, the utility model has the following advantages:

[0021] (1) The utility model sets the size of the variable cross-section section in a decreasing manner from top to bottom, and starts to reduce the cross-section when the column foot is inserted into the basement top plate to a depth of 2.5b (b is the side length of the bottom surface of the upper steel column), and cooperates with the upper and lower sections of the steel-reinforced concrete column and the outer periphery of the variable cross-section section to be formed by pouring concrete. The high compressive bearing capacity of concrete is used to make the entire column foot meet the structural stress and construction requirements, thereby increasing the service life and reasonably reducing the cross-section size of the steel-reinforced concrete column required for the structure, avoiding unnecessary waste of materials and space, and increasing the size and number of parking spaces in the basement.

[0022] (2) The elevations of the beam tops at both ends of the column foot of the utility model can be adjusted independently, thereby achieving inconsistency in the elevations of the beam tops at both ends. The utility model has wide adaptability and can meet different building functions and spatial layouts. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic cross-sectional diagram of a contracted column base of a steel column inserted into a basement according to Example 1 of the present utility model.

[0024] Description of the marks in the figure:

[0025] 1-upper steel column, 2-upper steel-reinforced concrete column, 3-basement top plate, 4-upper inner partition, 5-lower inner partition, 6-variable section, 7-concrete cover, 8-lower steel-reinforced concrete column, 9-stud. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0027] 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 positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on 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.

[0028] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] In the following implementation manners or examples, unless otherwise specified, functional components or structures are conventional components or conventional structures used in the art to achieve corresponding functions.

[0030] Example 1

[0031] See Figure 1 The utility model provides a cross-section shrinkage column base for inserting steel columns into basements, which comprises, from top to bottom, an upper steel column 1, an upper steel-framed concrete column 2, a variable-section section 6, and a lower steel-framed concrete column 8;

[0032] The upper steel column 1 is arranged outside the basement, and the upper steel-framed concrete column 2, the variable-section segment 6, and the lower steel-framed concrete column 8 are arranged in sequence inside the basement, wherein the upper steel-framed concrete column 2 and the lower steel-framed concrete column 8 are connected by the variable-section segment 6, and the variable-section segment 6 is welded to the upper and lower sections of the steel-framed concrete column with equal strength;

[0033] The variable cross-section segment 6 is a frustum structure that is larger at the top and smaller at the bottom. The top cross-sectional size of the variable cross-section segment 6 is the same as the cross-sectional size of the upper steel-framed concrete column 2 and the orthographic projection coincides with it. The bottom cross-sectional size of the variable cross-section segment 6 is the same as the cross-sectional size of the lower steel-framed concrete column 8 and the orthographic projection coincides with it. The cross-sectional area of the upper steel-framed concrete column 2 is larger than that of the lower steel-framed concrete column 8.

[0034] According to construction requirements, the upper steel-framed concrete column 2, the variable-section segment 6, and the lower steel-framed concrete column 8 all include an internal steel frame body, a number of bolts 9 welded to the outer wall of the steel frame body, and a peripheral concrete protective layer 7, and the thickness of the concrete protective layer 7 is 200 mm; the side slope of the variable-section segment 6 is 1:6, wherein the side slope of the variable-section segment 6 refers to both the side slope of the steel frame inside the variable-section segment 6 and the side slope of the concrete protective layer 7 wrapped around the variable-section segment 6.

[0035] In this embodiment, an upper inner baffle 4 is provided inside the connection between the upper steel-framed concrete column 2 and the variable-section segment 6, and a lower inner baffle 5 is provided inside the connection between the lower steel-framed concrete column 8 and the variable-section segment 6. Concrete pouring holes are provided in the middle of both the upper inner baffle 4 and the lower inner baffle 5, wherein the concrete poured into the variable-section segment 6 is self-compacting concrete.

[0036] In this embodiment, the bottom surfaces of the upper steel column 1 and the internal steel frame of the upper steel-frame concrete column 2 are both square, and the side lengths are both 600mm. The column foot begins to narrow in cross-section after being inserted into the basement top plate 3 to a depth of 2.5b (b is the side length of the bottom surface of the upper steel column), so the height of the upper steel-frame concrete column 2 is 1500mm; since the side slope of the variable-section section 6 is 1:6, the height of the variable-section section 6 is 600mm, and the bottom surface side length of the internal steel frame of the upper steel-frame concrete column 2 is 600mm, the bottom surface side length of the internal steel frame of the lower steel-frame concrete column 8 is 400mm, that is, the size of the lower steel-frame concrete column 8 is reduced from the original 1000×1000mm to 800×800mm, which effectively saves space in the basement and ensures the size of the basement parking space.

[0037] like Figure 1 As shown, the beam top elevations at both ends of the cross-section contraction column base are inconsistent, one end is -0.050m, aligned with the upper steel-framed concrete column top elevation; the other end is -0.400m, lower than the column top elevation, and can be used at the junction of the basement floor height difference.

[0038] The above description of the embodiments is intended to facilitate understanding and use of the utility model by those skilled in the art. Those skilled in the art will readily be able to make various modifications to these embodiments and apply the general principles described herein to other embodiments without requiring inventive effort. Therefore, the utility model is not limited to the above-described embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of this utility model without departing from the scope of this utility model should be within the scope of protection of this utility model.

Claims

1. A cross-section shrinkage column base for a steel column inserted into a basement, characterized in that: It comprises an upper steel column (1), an upper steel-framed concrete column (2), a variable-section section (6), and a lower steel-framed concrete column (8); The upper steel column (1) is arranged outside the basement, and the upper steel-framed concrete column (2), the variable-section section (6), and the lower steel-framed concrete column (8) are arranged in sequence inside the basement. The upper steel-framed concrete column (2) is vertically arranged above the variable-section section (6), and the lower steel-framed concrete column (8) is arranged below the variable-section section (6); The variable cross-section section (6) is a frustum structure with a larger upper portion and a smaller lower portion. The top cross-section size of the variable cross-section section (6) is the same as the cross-section of the upper steel-framed concrete column (2) and the orthographic projection coincides with the top cross-section size of the variable cross-section section (6). The bottom cross-section size of the variable cross-section section (6) is the same as the cross-section of the lower steel-framed concrete column (8) and the orthographic projection coincides with the top cross-section size of the lower steel-framed concrete column (8). The cross-section of the upper steel-framed concrete column (2) is larger than that of the lower steel-framed concrete column (8). The column foot begins to reduce in cross section after being inserted into the basement top plate (3) to a depth of (2.5-3)b, wherein b is the side length of the bottom surface of the upper steel column.

2. The cross-section contraction column base for inserting a steel column into a basement according to claim 1, characterized in that: The variable cross-section section (6) is strongly welded to the internal steel frames of the upper and lower sections of the steel-reinforced concrete column.

3. The cross-section contraction column base for inserting a steel column into a basement according to claim 1, characterized in that: The upper steel-frame concrete column (2), the variable-section section (6), and the lower steel-frame concrete column (8) all include an internal steel frame body, a plurality of bolts (9) welded to the outer wall of the steel frame body, and a concrete protective layer (7) covering the outer periphery.

4. The cross-section contraction column base for inserting a steel column into a basement according to claim 3, characterized in that: The thickness of the concrete protective layer (7) is 200-300 mm.

5. The cross-section contraction column base for inserting a steel column into a basement according to claim 1, characterized in that: The side slope of the variable cross-section section (6) is less than or equal to 1:

6.

6. The cross-section contracted column base for inserting a steel column into a basement according to claim 1, characterized in that: An upper inner partition (4) is provided inside the connection between the upper steel-framed concrete column (2) and the variable cross-section section (6), and a lower inner partition (5) is provided inside the connection between the lower steel-framed concrete column (8) and the variable cross-section section (6). Concrete pouring holes are provided in the middle of both the upper inner partition (4) and the lower inner partition (5).

7. The cross-section contraction column base for inserting a steel column into a basement according to claim 6, characterized in that: The concrete poured into the variable cross-section section (6) is self-compacting concrete.

8. The cross-section contracted column base for inserting a steel column into a basement according to claim 1, characterized in that: The bottom surface of the upper steel column (1) and the bottom surfaces of the steel frames inside the upper steel-framed concrete column (2), the variable cross-section section (6), and the lower steel-framed concrete column (8) are all rectangular or circular.

9. The cross-section contracted column base for inserting a steel column into a basement according to claim 1, characterized in that: The beam height of the basement is 800-1100 mm.

10. The cross-section contracted column base for a steel column inserted into a basement according to claim 1, characterized in that: The basement top plate (3) has an elevation of -2 to 0 m, and the elevation of the basement top plate (3) is aligned with or lower than the elevation of the upper steel-framed concrete column top. The elevations of the beam tops at both ends of the column foot are equal or unequal.

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