A column base structure of an exposed steel column

Abstract

The utility model relates to the technical field of building steel columns, and specifically discloses a column foot structure of an exposed steel column, including a steel column body, a bottom plate fixedly connected to the bottom of the steel column body, and an anchor bolt pre-buried in the foundation, the bottom plate is provided with a connection hole at the position corresponding to the anchor bolt, the top of the anchor bolt passes through the connection hole, and the anchor bolt and the bottom plate are fixedly connected by a nut; the steel column body includes an above-ground section and an underground section, the underground section is surrounded by a reinforcement layer, and the elevation of the top of the reinforcement layer is ±0.000 meters; the reinforcement layer includes a concrete layer cast on the top of the foundation and a steel cage embedded in the concrete layer, and the bottom of the steel cage extends out of the concrete layer and is embedded in the foundation. The technical solution provided by the utility model can solve the technical problem that the column foot structure of the prior art has no effect on improving the bearing capacity of the exposed steel column, resulting in the bearing capacity of the exposed steel column failing to meet the design requirements of occasions with greater bearing capacity requirements.

Description

Technical Field

[0001] The utility model relates to the technical field of building steel columns, in particular to a column foot structure of an exposed steel column. Background Art

[0002] With the continuous development of urban construction, exposed steel columns, as a highly practical building structural element, are widely used in architectural design. Exposed steel columns refer to a column structure in which the bottom of the steel column is directly set on the foundation. The bottom of the steel column is not buried in the concrete foundation, but is fixedly connected to the concrete foundation through the bottom plate of the column foot structure and anchor bolts. This installation method makes the bottom of the steel column "exposed" on the foundation surface.

[0003] In the steel building structure system, the column base structure is an important component connecting the steel column and the foundation. It is used to transmit the supporting reaction force of the bottom of the steel column to the foundation and constrain the displacement of the bottom of the steel column. It is an important factor that determines the bearing capacity of the entire structural system. The existing column base structure includes a base plate welded to the bottom of the steel column and an anchor bolt embedded in the foundation. The base plate is provided with a connection hole corresponding to the position of the anchor bolt. The top of the anchor bolt passes through the connection hole, and the anchor bolt and the base plate are fixed by nuts to achieve the fixation of the steel column and the foundation. The above-mentioned prior art still has the following problems in actual use:

[0004] 1) In situations where the bearing capacity of exposed steel columns is required to be relatively large, such as when there is a need for driving on the surface layer, the exposed steel columns in the basement need to have a relatively large bearing capacity. Since the column base structure of the prior art does not improve the bearing capacity of exposed steel columns, the bearing capacity of the exposed steel columns cannot meet the design requirements.

[0005] 2) The column base structure of the prior art has poor stability when subjected to axial force and torque, resulting in the seismic performance of the exposed steel column being insufficient and unable to fully meet the seismic requirements. Utility Model Content

[0006] The utility model aims to provide a column base structure for an exposed steel column to solve the technical problem that the column base structure in the prior art has no effect on improving the bearing capacity of the exposed steel column, resulting in the bearing capacity of the exposed steel column failing to meet the design requirements for occasions with greater bearing capacity requirements.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A column base structure for an exposed steel column, comprising a steel column body, a base plate fixedly connected to the bottom of the steel column body, and anchor bolts embedded in a foundation, wherein the base plate is provided with connection holes at positions corresponding to the anchor bolts, the tops of the anchor bolts pass through the connection holes, and the anchor bolts and the base plate are fixedly connected by nuts; the steel column body comprises an above-ground section and an underground section, the underground section is surrounded by a reinforcement layer, and the elevation of the top of the reinforcement layer is ±0.000 meters; the reinforcement layer comprises a concrete layer cast on the top of the foundation and a steel cage embedded in the concrete layer, and the bottom of the steel cage extends out of the concrete layer and is embedded in the inside of the foundation.

[0009] The underground section refers to the portion where the steel column body is located in the basement, and correspondingly, the above-ground section refers to the portion where the steel column body is located above the surface layer.

[0010] The principle and beneficial effects of this program:

[0011] In actual application, the bottom plate at the bottom of the steel column body is fixedly connected to the anchor bolts embedded in the foundation through nuts to achieve a fixed connection between the steel column body and the foundation. At this time, the underground section of the steel column body is located in the basement, and the above-ground section of the steel column body is located above the surface layer. The steel cage is tied around the underground section so that the bottom elevation of the steel cage is lower than the bottom elevation of the underground section, and the bottom of the steel cage is poured into the foundation. Then, a concrete layer is poured around the underground section at the steel cage until the top elevation of the concrete layer reaches ±0.000 meters, that is, the top of the concrete layer is poured to the surface layer.

[0012] 1. Improve the bearing capacity of exposed steel columns: This solution sets the part of the steel column body located in the basement as the underground section, and covers the underground section with a reinforcement layer. The reinforcement layer includes a concrete layer poured on the top of the foundation and a steel cage embedded in the concrete layer. That is, the outer surface of the exposed steel column is covered with reinforced concrete, which can effectively improve the bearing capacity of the exposed steel column and meet the driving requirements of the surface layer. This reinforcement technology is called the external concrete reinforcement method, and its working principle is mainly based on the following aspects:

[0013] (1) Composite force principle: The outer reinforcement layer and the steel column body form a combined structure and participate in the force together. The reinforcement layer adopts reinforced concrete structure, which provides excellent compressive resistance, while the steel column body has excellent tensile resistance. This combined structure fully utilizes the mechanical advantages of the two materials and enhances the bearing capacity and stability of the column base structure.

[0014] (2) Change the cross-sectional characteristics: By enclosing the reinforcement layer, the cross-sectional dimensions of the steel column body are substantially increased, the moment of inertia and section modulus of the section are increased, and thus the bending, shear and torsion resistance of the column base structure is improved. This means that under the same load, the deformation of the column base structure is reduced and the bearing capacity is increased.

[0015] (3) Improve seismic performance: Under the action of an earthquake, the external reinforcement layer can improve the energy dissipation capacity and ductility of the column base structure, reduce the seismic response, and improve the seismic performance of the column base structure. The plastic deformation capacity of the concrete layer of the reinforcement layer can absorb seismic energy to a certain extent and protect the internal steel column body from damage.

[0016] 2. Improve the stability of the column base structure when bearing axial force and torque, thereby improving the seismic performance of the exposed steel column and ensuring that the exposed steel column meets the seismic requirements, which is specifically reflected in the following aspects:

[0017] (1) In this scheme, the fixed connection method between the column base structure and the foundation is rigid connection. When the column base structure rigidly connected to the foundation is subjected to a torsional force, part of the force will drive the column base structure to have a tendency to rotate. At this time, the bottom structure of the steel cage embedded in the foundation prevents the column base structure from rotating, thereby improving the anti-torque performance of the column base structure.

[0018] (2) Compared with the previous method of anchoring the column base structure only with anchor bolts, the steel cage bottom structure embedded in the foundation in this solution expands the effective area of ​​the column base structure when it is subjected to axial pressure and tension, thereby increasing the upper limit of the axial force that the column base structure can withstand. In addition, the steel cage bottom structure embedded in the foundation can better prevent the column base structure from tipping over, ultimately making the column base structure more effective in preventing subsidence and falling out (foundation surface).

[0019] Preferably, as an improvement, the steel cage includes a plurality of vertically arranged column longitudinal bars and a plurality of horizontally arranged column stirrups, and the column stirrups are fixedly connected to the column longitudinal bars.

[0020] Beneficial effects: This solution sets the steel cage to include a number of vertically arranged column longitudinal bars and a number of horizontally arranged column stirrups. The bottom of the column longitudinal bars is embedded in the foundation, and part of the column stirrups is also embedded in the foundation. When the column base structure just connected to the foundation is subjected to a torsional force, part of the force will drive the column base structure to have a tendency to rotate. At this time, the bottom of the column longitudinal bars embedded in the foundation blocks the rotation of the column base structure, thereby improving the anti-torque performance of the column base structure. The part of the column stirrups embedded in the foundation expands the effective area of ​​the column base structure when it is subjected to axial pressure and tension, thereby increasing the upper limit of the axial force that the column base structure can withstand. In addition, this solution fixes the column stirrups to the column longitudinal bars, which facilitates the pouring of the concrete layer, avoids displacement of the column stirrups during the pouring of the concrete layer, and ensures the construction effect of the reinforcement layer.

[0021] Preferably, as an improvement, the column stirrups include inner stirrups and outer stirrups arranged in sequence from the inside to the outside, and the inner stirrups and the outer stirrups are connected end to end.

[0022] Beneficial effect: This scheme arranges the column stirrups to include inner stirrups and outer stirrups arranged in sequence from the inside to the outside, and arranges the inner stirrups and the outer stirrups to be connected end to end to form two closed stirrup rings inside and outside, which can effectively improve the comprehensive performance of the reinforcement layer, not only enhance the safety of the reinforcement layer, but also improve the durability of the reinforcement layer. Specifically, it manifests itself in the following aspects: (1) Improving shear bearing capacity: The inner and outer layers of stirrups can effectively constrain the concrete layer and improve the shear strength of the concrete layer, especially when subjected to lateral shear forces such as wind loads and earthquakes, which can significantly improve the overall shear bearing capacity and stability of the reinforced layer; (2) Enhancing torsional performance: The inner and outer layers of closed stirrup rings formed by the inner and outer stirrups can effectively constrain the core of the concrete layer and improve the torsional stiffness and torsional bearing capacity of the column base structure, which is crucial for resisting torsional loads such as wind torsion and torsional deformation caused by seismic waves; (3) Improving stress distribution: The inner and outer stirrups can evenly distribute the stress caused by external forces and reduce stress concentration, especially in the interface area where the concrete layer and the steel column body are combined, effectively preventing the concrete layer from cracking and improving the integrity and durability of the column base structure.

[0023] Preferably, as an improvement, the steel column body includes a cross-shaped web and wing plates fixedly connected to ends of the web, and the wing plates and the web are vertically arranged.

[0024] Beneficial effects: This solution sets the steel column body to include a cross-shaped web and a wing plate fixedly connected to the end of the web, so that the steel column body is cross-shaped as a whole. In this way, the steel column body has no obvious weak axis, so that the stress performance of the steel column body in all directions is relatively balanced, and it can effectively transfer loads in all directions, especially under composite stress conditions, so that the steel column body has strong seismic resistance and overall structural stability. The cross-shaped web and the wing plate fixedly connected to its end can be tightly combined with the concrete layer, so that the column base structure has stronger shear and bending resistance. In addition, this solution sets the wing plate and the web vertically, which not only facilitates the welding and fixation of the wing plate and the web, but also forms a small cross-shaped structure at the end of the wing plate and the web, thereby improving the degree of bonding between the ends of the wing plate and the web and the concrete layer, which is conducive to further enhancing the shear and bending resistance of the column base structure.

[0025] Preferably, as an improvement, a bolt is fixedly connected to the side of the wing plate away from the web, and the small diameter end of the bolt is connected to the wing plate.

[0026] Beneficial effect: This solution fixes the connecting bolt on the side of the wing plate away from the web plate, and connects the small diameter end of the bolt to the wing plate, so that the large diameter end of the bolt is embedded in the concrete layer, which can further improve the bonding tightness between the overall steel column body and the concrete layer, thereby further enhancing the shear and bending resistance of the column base structure.

[0027] Preferably, as an improvement, a filling layer is cast between the base plate and the foundation, the portion of the anchor bolt located above the base plate is threadedly connected with an upper nut, and the portion of the anchor bolt located below the base plate is threadedly connected with a lower nut, and the upper nut and the lower nut cooperate to clamp and fix the base plate.

[0028] Beneficial effects: This solution pours a filling layer between the bottom plate and the foundation, and fills the gap between the bottom plate and the foundation through the filling layer, so that the bottom plate and the foundation can form an integral mechanical connection unit, thereby significantly enhancing the connection strength and stability between the column base structure and the foundation, ensuring the shear and pull-out resistance of the column base structure, and preventing the column base structure from slipping or pulling out under load. In addition, after pouring the filling layer between the bottom plate and the foundation to form a continuous structure, dynamic loads such as earthquakes can be effectively transmitted and distributed through the filling layer, reducing the vibration of the column base structure and improving the seismic performance of the column base structure.

[0029] In this solution, upper nuts and lower nuts are respectively threadedly connected at the anchor bolt positions above and below the base plate, and the base plate is clamped and fixed by the cooperation of the upper and lower nuts. Compared with threading nuts at the anchor bolt positions only on one side of the base plate, this solution can improve the relative position stability of the base plate and the anchor bolts, and avoid displacement of the base plate during subsequent construction, thereby ensuring that the elevation of the base plate meets the design requirements, and further ensuring that the elevation of the entire column base structure meets the design requirements.

[0030] Preferably, as an improvement, a plurality of through exhaust holes are provided on the bottom plate, and the cross-shaped web divides the bottom plate into four areas, and at least one exhaust hole is distributed in each area of ​​the bottom plate.

[0031] Beneficial effects: During the pouring of the filling layer between the base plate and the foundation, the mixture of cement slurry and aggregate will produce bubbles. If these bubbles are enclosed in the concrete of the filling layer, they will affect the strength and durability of the filling layer. This solution sets a number of through exhaust holes on the base plate to provide an escape path for these bubbles, which can effectively remove the bubbles inside the concrete during the pouring process, which is beneficial to reduce the porosity and prevent the formation of large voids or bubble strings inside the concrete of the filling layer. Exhausting through the exhaust holes can make the concrete of the filling layer more compact during the solidification process, improve the integrity and bearing capacity of the filling layer, and reduce stress concentration and potential structural defects caused by internal voids. In addition, the exhaust holes can discharge bubbles to avoid bubbles remaining in the contact area between the base plate and the filling layer, ensure the effective bonding area between the base plate and the filling layer, thereby ensuring the reliability of the connection between the base plate and the filling layer, preventing possible peeling or cracks in the future, and improving the durability of the column base structure.

[0032] In addition, the cross-shaped web of the present solution divides the base plate into four areas, and at least one exhaust hole is distributed in each area of ​​the base plate, which can more evenly remove the gas in the concrete pouring process of the filling layer, ensure that the concrete of the filling layer corresponding to each area of ​​the base plate can be fully dense, reduce pores, and improve the overall uniformity and quality of the concrete of the filling layer.

[0033] Preferably, as an improvement, a through hole is opened in the middle of the bottom plate, and the center of the through hole coincides with the horizontal projection of the center of the web.

[0034] Beneficial effects: This solution opens a through hole in the middle of the base plate. On the one hand, during the pouring of the filling layer between the base plate and the foundation, the through hole can act as a vent, providing an escape path for bubbles generated during the pouring of concrete in the filling layer, thereby ensuring the density and durability of the filling layer; on the other hand, the through hole can reduce the weight of the base plate to a certain extent, thereby reducing the weight of the entire column foot structure, making it easier to transport and install. In addition, this solution sets the center of the through hole to coincide with the horizontal projection of the center of the web. When connecting the base plate and the steel column body, the base plate and the steel column body can be centrally positioned through the through hole, thereby improving the convenience and accuracy of assembly of the base plate and the steel column body. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall structure of Example 1 of the utility model.

[0036] Figure 2 for Figure 1 A top view of (foundation not shown).

[0037] Figure 3 It is a top view of the steel column body and the base plate in Example 1 of the utility model.

[0038] Figure 4 It is a top view of the steel column body and the base plate in Example 2 of the utility model.

[0039] Figure 5 It is a top view of the steel column body and the base plate in Example 3 of the utility model. DETAILED DESCRIPTION

[0040] The following is further described in detail through specific implementation methods:

[0041] The figure marks in the drawings of the specification include: steel column body 1, underground section 10, web 11, wing plate 12, bolt 13, base plate 2, vent 21, through hole 22, anchor bolt 3, upper nut 41, lower nut 42, reinforcement layer 5, concrete layer 51, column longitudinal reinforcement 52, column stirrups 53, inner stirrups 531, outer stirrups 532, filling layer 6, foundation 100.

[0042] Example 1

[0043] A column base structure of an exposed steel column, such as the attached Figure 1 As shown, it includes a steel column body 1, a base plate 2 welded and fixed to the bottom of the steel column body 1, and an anchor bolt 3 pre-buried in the foundation 100. A connection hole is opened at the position of the base plate 2 corresponding to the anchor bolt 3. The top of the anchor bolt 3 passes through the connection hole, and the anchor bolt 3 and the base plate 2 are fixedly connected by a nut. Specifically, the portion of the anchor bolt 3 located above the base plate 2 is threadedly connected with an upper nut 41, and the portion of the anchor bolt 3 located below the base plate 2 is threadedly connected with a lower nut 42. The upper nut 41 and the lower nut 42 cooperate to clamp and fix the base plate 2. In this embodiment, the number of the upper nuts 41 is two, so as to improve the connection stability between the base plate 2 and the anchor bolt 3.

[0044] The steel column body 1 includes an above-ground section (not shown) and an underground section 10. The underground section 10 is surrounded by a reinforcement layer 5. The top elevation of the reinforcement layer 5 is ±0.000 meters, that is, the top of the reinforcement layer 5 is flush with the surface layer. A filling layer 6 is poured between the bottom plate 2 and the foundation 100.

[0045] The reinforcement layer 5 includes a concrete layer 51 cast on the top of the foundation 100 and a steel cage embedded in the concrete layer 51. The bottom of the steel cage extends out of the concrete layer 51 and is embedded in the inside of the foundation 100. The steel cage includes a plurality of vertically arranged column longitudinal bars 52 and a plurality of horizontally arranged column stirrups 53. The column stirrups 53 are fixedly connected to the column longitudinal bars 52 by binding. In this embodiment, the grooves of the plurality of column longitudinal bars 52 are rectangular and evenly distributed around the steel column body 1, and the column stirrups 53 are evenly distributed along the height direction of the column body. Figure 2 As shown, the column stirrups 53 include inner stirrups 531 and outer stirrups 532 arranged in sequence from the inside to the outside, and the inner stirrups 531 and the outer stirrups 532 are connected end to end to form a closed stirrup ring to surround the steel column body 1. In this embodiment, the inner stirrups 531 are octagonal, the outer stirrups 532 are rectangular, and the joints of the inner stirrups 531 and the joints of the outer stirrups 532 are staggered.

[0046] Combination Figure 3 As shown, the steel column body 1 includes a cross-shaped web 11 and a flange 12 welded and fixedly connected to the end of the web 11. The flange 12 and the web 11 are arranged vertically, and the flange 12 is connected to the web 11 at the midpoint. A stud 13 is welded and fixedly provided on the side of the flange 12 away from the web 11, and the small diameter end of the stud 13 is connected to the flange 12. In this embodiment, each flange 12 has one row (two) of studs 13 evenly distributed in the horizontal direction, and several rows of studs 13 evenly distributed in the vertical direction.

[0047] The specific implementation process is as follows:

[0048] (1) Construction of foundation 100: Build a template at the designed position, cast the foundation 100 in the template, and embed the anchor bolts 3 and the bottom of the steel cage in the foundation 100, and ensure that the top of the anchor bolts 3 and the bottom of the steel cage are exposed from the foundation 100.

[0049] (2) Assembly of the steel column body 1: First, a cross-shaped web 11 is formed by welding steel plates. Steel plates are welded and fixed at the ends of the cross-shaped web 11 to form flanges 12. The small-diameter ends of the bolts 13 are welded and fixed to the outer walls of the flanges 12 to form the steel column body 1. The bottom plate 2 is then welded and fixed to the bottom of the steel column body 1, and the projections of the centers of the bottom plate 2 and the steel column body 1 on the horizontal plane are made to coincide with each other, thus completing the assembly of the steel column body 1 and the bottom plate 2.

[0050] (3) Installation of the steel column body 1: The assembled steel column body 1 is hoisted onto the foundation 100 by a lifting device, so that the top of the anchor bolt 3 passes through the corresponding connection hole on the base plate 2. The base plate 2 is clamped and fixed by tightening the upper nut 41 and the lower nut 42 to achieve a fixed connection between the steel column body 1 and the foundation 100, thereby completing the installation of the steel column body 1.

[0051] (4) Construction of the filling layer 6: Concrete is poured in the gap between the bottom plate 2 and the foundation 100 to form a filling layer 6, and the bottom plate 2 and the foundation 100 are connected through the filling layer 6.

[0052] (5) Construction of the reinforcement layer 5: The upper part of the reinforcement cage is welded and fixed at the part of the bottom of the reinforcement cage where the foundation 100 is exposed. Specifically, the upper column longitudinal bars 52 are welded one by one to the bottom column longitudinal bars 52, and the upper column stirrups 53 are tied and fixed to the upper column longitudinal bars 52 to form the upper reinforcement cage; then, a formwork is built around the upper reinforcement cage, and concrete is poured in the formwork to form a concrete layer 51 until the top elevation of the concrete layer 51 reaches ±0.000 meters, completing the construction of the reinforcement layer 5.

[0053] The column foot structure of this embodiment can improve the bearing capacity of the exposed steel column, that is, by covering the reinforcement layer 5 around the underground section 10 of the steel column body 1, the bearing capacity of the exposed steel column is improved through the reinforcement principle of reinforced concrete, thereby meeting the driving requirements of the surface layer. In addition, this embodiment embeds the bottom of the steel cage inside the foundation 100, which can improve the stability of the column foot structure when it is subjected to axial force and torque, thereby improving the seismic performance of the exposed steel column and ensuring that the exposed steel column meets the seismic requirements.

[0054] Example 2

[0055] A column base structure of an exposed steel column, such as the attached Figure 4As shown, the difference from the embodiment 1 is that: a plurality of exhaust holes 21 are formed on the bottom plate 2, the cross-shaped web 11 divides the web 11 into four evenly spaced regions, and at least one exhaust hole 21 is distributed in each region of the bottom plate 2. In this embodiment, one exhaust hole 21 is distributed in each region of the bottom plate 2, and a total of four exhaust holes 21 are evenly distributed on the bottom plate 2.

[0056] During the pouring process of the filling layer 6 between the base plate 2 and the foundation 100, the cement slurry and the aggregate will mix and generate bubbles. If these bubbles are enclosed in the concrete of the filling layer 6, the strength and durability of the filling layer 6 will be affected. In this embodiment, a number of through-holes 21 are set on the base plate 2 to provide an escape path for these bubbles, which can effectively remove the bubbles inside the concrete during the pouring process, which is conducive to reducing the porosity and preventing the formation of large cavities or bubble strings inside the concrete of the filling layer 6, so that the concrete of the filling layer 6 is more compact during the solidification process, improving the integrity and bearing capacity of the filling layer 6, and reducing stress concentration and potential structural defects caused by internal voids. The setting of the distribution position of the vent holes 21 in this embodiment can more evenly remove the gas in the pouring process of the concrete of the filling layer 6, ensuring that the concrete of the filling layer 6 corresponding to each area of ​​the base plate 2 can be fully compacted, reducing pores, and improving the overall uniformity and quality of the concrete of the filling layer 6.

[0057] Example 3

[0058] A column base structure of an exposed steel column, such as the attached Figure 5 As shown, the difference from the second embodiment is that a through hole 22 is opened in the middle of the bottom plate 2 , and the center of the through hole 22 coincides with the horizontal projection of the center of the web 11 .

[0059] The through hole 22 in this embodiment can act as the exhaust hole 21 during the process of pouring the filling layer 6 between the base plate 2 and the foundation 100, thereby increasing the escape path of bubbles and further improving the density and durability of the filling layer 6. It can also be used as a central positioning reference when assembling the base plate 2 and the steel column body 1, thereby improving the convenience and accuracy of assembly.

[0060] The above is only an embodiment of the utility model, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A column foot structure of an exposed steel column, comprising a steel column body, a bottom plate fixedly connected to the bottom of the steel column body, and anchor bolts pre-buried in the foundation, a connection hole is opened at the bottom plate corresponding to the position of the anchor bolt, the top of the anchor bolt passes through the connection hole, and the anchor bolt and the bottom plate are fixedly connected by a nut; characterized in that: The steel column body includes an above-ground section and an underground section. The underground section is covered with a reinforcement layer on all sides, and the elevation of the top of the reinforcement layer is ±0.000 meters. The reinforcement layer includes a concrete layer cast on the top of the foundation and a steel cage embedded in the concrete layer. The bottom of the steel cage extends out of the concrete layer and is embedded in the inside of the foundation.

2. The column base structure of an exposed steel column according to claim 1, characterized in that: The steel cage comprises a plurality of vertically arranged column longitudinal bars and a plurality of horizontally arranged column stirrups, wherein the column stirrups are fixedly connected to the column longitudinal bars.

3. The column base structure of an exposed steel column according to claim 2, characterized in that: The column stirrups include inner stirrups and outer stirrups which are sequentially arranged from the inside to the outside, and the inner stirrups and the outer stirrups are connected end to end.

4. The column base structure of an exposed steel column according to claim 1, characterized in that: The steel column body comprises a cross-shaped web and wing plates fixedly connected to the ends of the web, and the wing plates and the web are arranged vertically.

5. The column base structure of an exposed steel column according to claim 4, characterized in that: A bolt is fixedly connected to one side of the wing plate away from the web plate, and a small diameter end of the bolt is connected to the wing plate.

6. The column base structure of an exposed steel column according to claim 4 or 5, characterized in that: A filling layer is cast between the base plate and the foundation, an upper nut is threadedly connected to the anchor bolt at the top of the base plate, and a lower nut is threadedly connected to the anchor bolt at the bottom of the base plate. The upper nut and the lower nut cooperate to clamp and fix the base plate.

7. The column base structure of an exposed steel column according to claim 6, characterized in that: The bottom plate is provided with a plurality of through exhaust holes, and the cross-shaped web divides the bottom plate into four areas, and each area of ​​the bottom plate has at least one exhaust hole.

8. The column base structure of an exposed steel column according to claim 7, characterized in that: A through hole is provided in the middle of the bottom plate, and the center of the through hole coincides with the horizontal projection of the center of the web.

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