A connection structure and construction method for a large steel tube concrete column and a bearing platform

Abstract

The present application discloses a connection structure and construction method for a large steel pipe concrete column and a bearing platform, relating to the technical field of steel structure construction. The connection structure in the present application includes a large steel pipe concrete column and a cast-in-place concrete bearing platform. A steel plate is arranged between the steel pipe concrete column and the bearing platform. A support frame is arranged in the bearing platform. The steel plate is detachably connected to the support frame. Anchor fittings for connecting the steel plate and the bearing platform are arranged on the steel plate. A number of first clamping members and a number of shear keys fixedly connected to the first clamping members are also arranged on the steel plate. The support frame includes a number of mutually parallel vertical rods and a number of diagonal rods for connecting adjacent vertical rods. A corbel for supporting the steel plate is fixedly connected to the vertical rod. The present application also discloses a construction method for the connection structure of a large steel pipe concrete column and a bearing platform. The present application has the effect of enhancing the stability of the connection between the large steel pipe concrete column and the bearing platform.

Description

Technical Field

[0001] This application relates to the technical field of steel structure construction, and particularly relates to a connection structure and construction method for a large concrete-filled steel tube column and a bearing platform. Background Art

[0002] A concrete-filled steel tube column refers to a structural member formed by filling concrete in a steel tube, and the steel tube and its core concrete can jointly bear the action of external loads. Since the concrete has high compressive strength and weak bending resistance, while the steel has strong bending resistance and weak compressive resistance, the concrete-filled steel tube combines the advantages of the two in terms of structure. When the concrete-filled steel tube column is in a state of lateral compression, its compressive strength can be increased several times. At the same time, due to the presence of concrete, the stiffness of the steel tube is greatly improved.

[0003] For large building structures, the compressive stress and bending moment forces in all directions borne by each concrete-filled steel tube column are huge. Therefore, the stability of the connection between the concrete-filled steel tube column and the bearing platform is particularly important. In the related art, the bending resistance and seismic resistance effects at the connection between the concrete-filled steel tube column and the bearing platform need to be improved. Summary of the Invention

[0004] In order to enhance the stability of the connection between a large concrete-filled steel tube column and a bearing platform, this application provides a connection structure and construction method for a large concrete-filled steel tube column and a bearing platform.

[0005] In a first aspect, this application provides a connection structure for a large concrete-filled steel tube column and a bearing platform, adopting the following technical solution: A connection structure for a large concrete-filled steel tube column and a bearing platform includes a large concrete-filled steel tube column and a cast-in-place concrete bearing platform. A steel plate is arranged between the concrete-filled steel tube column and the bearing platform, and a support frame is arranged in the bearing platform. The steel plate is detachably connected to the support frame;

[0006] An anchor is arranged on the steel plate for connecting the steel plate and the bearing platform;

[0007] A number of first clamping members and a number of shear keys fixedly connected to the first clamping members are further arranged on the steel plate;

[0008] The support frame includes a number of parallel vertical rods and a number of diagonal rods for connecting adjacent vertical rods; a bracket for supporting the steel plate is fixedly connected to the vertical rods.

[0009] By adopting the above technical solution, a steel plate is arranged between the concrete-filled steel tubular column and the bearing platform, and anchor fittings are arranged on the steel plate. Compared with the related technology, the arrangement of the anchor fittings makes the connection between the steel plate and the bearing platform more stable to meet the stable connection between the large concrete-filled steel tubular column and the bearing platform; a support frame is arranged below the steel plate, and the steel plate is fixed on the bracket on the vertical rod of the support frame, and then the concrete-filled steel tubular column is hoisted on the surface of the steel plate through the fixed connection of the first clamping component and the shear key, so that the precise positioning and leveling of the support frame are controlled to ensure the precise positioning of the steel plate and the concrete-filled steel tubular column, reducing the construction error; diagonal rods are arranged between several vertical rods to enhance the stability of the support frame and better support the steel plate and the concrete-filled steel tubular column.

[0010] Optionally, a plurality of anchor holes are formed in the steel plate, and the anchor fittings include anchor bolts inserted into the anchor holes;

[0011] The anchor bolt includes an anchor rod and an anchor head, and a gasket is inserted on the anchor rod, and the gasket is fixedly connected with the steel plate.

[0012] By adopting the above technical solution, the anchor bolt is passed through the steel plate to realize the connection between the steel plate and the bearing platform. According to the specific engineering conditions of each project, the specification of the anchor rod can be adjusted to ensure that the connection between the steel plate and the bearing platform meets the force requirements, and the construction of the anchor bolt connection is convenient and simple. After the steel plate is hoisted, the anchor head needs to be tightened to realize the connection function of the anchor rod. A gasket sleeved on the anchor rod is arranged below the anchor head, increasing the fixing area between the anchor rod and the steel plate, thereby enhancing the stability of the anchor bolt.

[0013] Optionally, the first clamping member includes a first arc piece and a second arc piece that are parallel to each other. The first arc piece is used to abut against the inner wall of the concrete-filled steel tubular column, and the second arc piece is used to abut against the outer wall of the concrete-filled steel tubular column; the wall of the concrete-filled steel tubular column slides up and down in the first clamping member.

[0014] By adopting the above technical solution, when hoisting the concrete-filled steel tubular column, the wall of the concrete-filled steel tubular column is inserted between the first arc piece and the second arc piece, which limits the hoisting position of the concrete-filled steel tubular column, reduces the time for debugging and positioning during the hoisting process of the concrete-filled steel tubular column, improves the construction efficiency, and inserts the concrete-filled steel tubular column into the first clamping member, enhancing the bending and shear resistance of the connection between the concrete-filled steel tubular column and the bearing platform.

[0015] Optionally, a plurality of long grooves facing the center of the steel plate are formed in the steel plate, and the first clamping member can slide along the long grooves.

[0016] By adopting the above technical solution, the first clamping member slides along the long groove, so that the steel plate can be applied to the construction of concrete-filled steel tubular columns within a certain diameter range, increasing the application working conditions of the same specification steel plate and improving the applicability of the structure of the present application.

[0017] Optionally, a number of second clamping members are fixed to the inner wall of the concrete-filled steel tube column. The second clamping members include two first clamping pieces and second clamping pieces arranged in parallel with each other, and a number of the shear keys slide correspondingly between the first clamping piece and the second clamping piece.

[0018] By adopting the above technical solution, when hoisting the concrete-filled steel tube, it is necessary not only to insert the wall of the concrete-filled steel tube into the first clamping member, but also to insert the shear key between the first clamping piece and the second clamping piece in order to successfully hoist the concrete-filled steel tube column, reducing the construction error during the hoisting process of the concrete-filled steel tube column; and the setting of the shear key enhances the shear resistance at the connection between the concrete-filled steel tube column and the steel plate.

[0019] Optionally, the concrete-filled steel tube column is bolted to the first arc piece and the second arc piece. The part of the bottom of the concrete-filled steel tube column that is not connected to the first clamping member is used for fixed connection with the steel plate, and a number of stiffening plates for fixing with the steel plate are fixedly arranged on the circumferential side of the concrete-filled steel tube column.

[0020] By adopting the above technical solution, the bottom of the concrete-filled steel tube column is connected to the steel plate at intervals by bolts and welding; through bolt connection, the seismic resistance at the connection between the concrete-filled steel tube column and the bearing platform is enhanced; through welding, the stable connection between the concrete-filled steel tube column and the steel plate is enhanced; the setting of the stiffening plate at the welding part makes the connection between the concrete-filled steel tube column and the steel plate more stable on the one hand, and enhances the bending and shear resistance at the connection between the concrete-filled steel tube column and the steel plate on the other hand.

[0021] Optionally, a tie rod is arranged between two vertically arranged rods at intervals, and both ends of the tie rod are fixedly connected to the vertically arranged rods.

[0022] By adopting the above technical solution, the inclined strut and the tie rod are used to connect a number of vertically arranged rods to form a stable support structure, enabling the support frame to maximize the bearing capacity of the support frame under the condition of a simple structure.

[0023] Optionally, a number of fixing grooves are formed in the steel plate, and the vertically arranged rods are correspondingly inserted into the fixing grooves.

[0024] By adopting the above technical solution, when hoisting the steel plate, after aligning the vertically arranged rod with the fixing groove on the steel plate, the steel plate is hoisted downward onto the bracket of the vertically arranged rod, reducing the possibility of construction positioning deviation in the steel plate hoisting positioning, and the construction operation is simple and convenient for construction.

[0025] Optionally, a number of vibrating holes are evenly spaced on the steel plate.

[0026] By adopting the above technical solution, after the steel plate is installed on the support frame, when pouring concrete, due to the large volume of the bearing platform and the large area of the steel plate, it is difficult to vibrate and compact the concrete under the steel plate during the pouring process. By arranging vibration holes at intervals on the steel plate, the possibility of vibrating and compacting the concrete under the steel plate is improved.

[0027] In a second aspect, the present application provides a construction method for connecting a concrete-filled steel tubular column and a bearing platform, using the connection structure of the large concrete-filled steel tubular column and the bearing platform as described above, and adopting the following technical solutions:

[0028] A construction method for connecting a concrete-filled steel tubular column and a bearing platform includes the following steps:

[0029] S1: Use measuring instruments to locate the hoisting position of the concrete-filled steel tubular column. When pouring the cushion layer in the bearing platform foundation pit, bury a number of steel sleeves at corresponding positions of several vertical rods of the support frame;

[0030] S2: After the cushion layer reaches the specified strength, level the absolute elevation in a number of steel sleeves, and make the absolute elevation in each steel sleeve consistent by increasing or decreasing the number of steel gaskets;

[0031] S3: Hoist the support frame, and correspond the position of each vertical rod of the support frame to the position of each steel sleeve in the cushion layer for hoisting; after hoisting is completed, pour concrete into the steel sleeves;

[0032] S4: After the support frame is installed, carry out steel bar binding of the bearing platform and pouring of the bearing platform concrete. The first pouring of the bearing platform concrete can reach a certain distance below the steel plate;

[0033] S5: Hoist the steel plate. During the hoisting process, a number of fixing grooves on the steel plate are aligned with the vertical rods, so that the vertical rods pass through the fixing grooves, and the steel plate is connected to the corbel by bolts;

[0034] S6: Weld a second clamping member inside the steel tubular column, and adjust the position of the first clamping member according to the diameter of the steel tubular column. After the adjustment is completed, the first clamping member is bolted to the steel plate;

[0035] S7: Carry out hoisting of the steel tubular column. During the hoisting process, the steel tubular column wall is clamped into the first clamping member on the steel plate, and the shear key on the steel plate is clamped into the second clamping member inside the steel tubular column;

[0036] S8: After hoisting is completed, carry out secondary pouring of the bearing platform concrete. During the pouring process, vibrate and compact the concrete under the steel plate through the vibration holes. The height of the steel tubular column buried in the bearing platform is obtained by force measurement according to the actual situation of each engineering project.

[0037] Through the above technical solution, steel sleeves are embedded during the casting of the cushion layer, the vertical rods of the support frame are inserted into the steel sleeves, and the steps of positioning and leveling the entire structure are transferred to the positioning and leveling of the steel sleeves, reducing the construction difficulty of positioning and leveling the entire structure and making the positioning measurement more convenient and accurate; a partial section of the concrete-filled steel tube column is buried inside the bearing platform, making the connection between the steel tube and the bearing platform more stable.

[0038] In summary, the present application includes at least one of the following beneficial effects:

[0039] 1. The steel plate is provided with a first clamping member for inserting the concrete-filled steel tube column, and the shear key on the steel plate can be inserted into the second clamping member welded inside the concrete-filled steel tube column, enhancing the bending and shear resistance of the connection between the concrete-filled steel tube column and the bearing platform; and the first clamping member can slide along the long groove, enabling the steel plate to be applied to the connection between the concrete-filled steel tube column and the bearing platform within a certain diameter range, with a wider scope of application;

[0040] 2. The first clamping members are arranged at intervals, and the first clamping members are connected to the wall of the concrete-filled steel tube column through high-strength bolts. Bolt connection has a better seismic effect than all-welding, making the seismic effect of the connection between the concrete-filled steel tube column and the bearing platform better; at the position where the first clamping member is not provided, the wall of the concrete-filled steel tube column is welded to the steel plate, and a ribbed plate is arranged at the welding position. The arrangement of the ribbed plate enhances the bending resistance of the connection between the concrete-filled steel tube column and the bearing platform;

[0041] 3. Steel sleeves are embedded in the cushion layer, and the absolute elevation inside the steel sleeves is adjusted by increasing or decreasing the number of steel gaskets to achieve precise positioning of the horizontal and elevation of the support frame; the steel plate is hoisted onto the bracket of the support frame and fixed to the support frame through high-strength bolts, reducing the possibility of deviation or surface inclination during the installation of the steel plate; during the hoisting process of the concrete-filled steel tube column, the wall of the concrete-filled steel tube column is clamped into the first clamping member, and the shear key on the steel plate is clamped into the second clamping member on the inner wall of the concrete-filled steel tube column, limiting the hoisting position of the concrete-filled steel tube column; thus, during the installation process, when the steel sleeves can be precisely positioned and leveled, the construction errors in subsequent construction steps can be theoretically eliminated. Description of the Drawings

[0042] Figure 1 is a schematic diagram of the bearing platform structure used in the embodiment of the present application;

[0043] Figure 2 is a schematic diagram of the structure after installing the concrete-filled steel tube column in the embodiment of the present application;

[0044] Figure 3 is a schematic diagram of the support frame structure used in the embodiment of the present application;

[0045] Figure 4 is a schematic diagram of the steel plate structure used in the embodiment of the present application;

[0046] Figure 5 It is a partial schematic diagram of the second card position component used in the embodiments of the present application.

[0047] Explanation of reference numerals: 1, concrete-filled steel tube column; 2, bearing platform; 3, steel plate; 4, support frame; 41, vertical rod; 42, inclined rod; 43, bracket; 44, tie rod; 5, anchor; 51, anchor hole; 52, anchor bolt; 521, anchor rod; 522, anchor head; 53, gasket; 6, first card position member; 61, first arc piece; 62, second arc piece; 7, shear key; 8, long slot; 9, second card position member; 91, first card position piece; 92, second card position piece; 10, ribbed plate; 11, fixed slot; 12, vibrating hole. Detailed implementation manners

[0048] The following further describes the present application in detail Figures 1-5 with reference to the accompanying drawings.

[0049] A connection structure between a large concrete-filled steel tube column and a bearing platform disclosed in the embodiments of the present application

[0050] Referring to Figure 1 , a connection structure between a large concrete-filled steel tube column 1 and a bearing platform 2 is used to achieve a stable connection between the bearing platform 2 and the concrete-filled steel tube column 1, and a partial section of the concrete-filled steel tube column 1 is poured into the bearing platform 2.

[0051] Referring to Figure 2 and Figure 3 , a support frame 4 is installed in the bearing platform 2. The support frame 4 includes four mutually parallel vertical rods 41, and the four vertical rods 41 are arranged in a square shape. An inclined rod 42 is connected between adjacent two vertical rods 41 by high-strength bolts, and a tie rod 44 is arranged between two opposite vertical rods 41. Two ends of the tie rod 44 are respectively connected to the two vertical rods 41 by high-strength bolts. In this embodiment, it is preferably that the vertical rods 41, the inclined rods 42 and the tie rods 44 all adopt various types of I-beams that meet the actual situations of each project. The inclined rods 42 and the tie rods 44 connect the vertical rods 41 into a whole to enhance the supporting ability and stability of the support frame 4.

[0052] Referring to Figure 2 and Figure 3 , four brackets 43 are integrally made on each of the four sides of each vertical rod 41, and each bracket 43 is connected to the side of the vertical rod 41 in an inverted right-angled trapezoid shape. A steel plate 3 is detachably arranged above the support frame 4, and a fixed slot 11 is formed on the steel plate 3. When hoisting the steel plate 3, the upper part of the vertical rod 41 passes through the fixed slot 11, so that the steel plate 3 abuts against the bracket 43. After the steel plate 3 is hoisted to the support frame 4, the steel plate 3 and the bracket 43 are fixedly connected by high-strength bolts.

[0053] Referring to Figure 2 andFigure 4 An anchor is provided on the steel plate 3 to achieve a firm connection between the steel plate 3 and the bearing platform 2. A number of anchor holes 51 are provided on the steel plate 3. The anchor includes an anchor bolt 52 inserted into the anchor hole 51. The anchor bolt 52 includes an anchor head 522 and an anchor rod 521. When hoisting the steel plate 3, the anchor rod 521 is inserted into the steel reinforcement cage of the bearing platform 2, and the anchor head 522 is arranged on the side of the steel plate 3 away from the support frame 4. After the concrete of the bearing platform 2 below the steel plate 3 is poured, the anchor head 522 is tightened to fasten the steel plate 3 to the bearing platform 2.

[0054] Refer to Figure 2 and Figure 4 A number of long grooves 8 are provided on the steel plate 3 and are oriented towards the center of the steel plate 3. In this embodiment, it is preferred that four long grooves 8 are provided on the square steel plate 3, and the four long grooves 8 are arranged along the diagonal of the steel plate 3. A number of anchor bolts 52 are also arranged on the steel plate 3 and pass through the long grooves 8. A gasket 53 is provided below the anchor head 522 of each anchor bolt 52 on the steel plate 3. The gasket 53 includes a first gasket and a second gasket. The first gasket is sleeved outside the anchor bolt 52 passing through the long groove 8 and is located below the anchor head 522. The second gasket is sleeved outside the anchor bolt 52 passing through the anchor hole 51 and is located below the anchor head 522. Four corners of the first gasket are fixed to the steel plate 3 by high-strength bolts to fix the position of the anchor bolt 52 arranged in the long groove 8, and the second gasket is pressed against the steel plate 3 during the tightening process of the anchor bolt 52.

[0055] Refer to Figure 2 and Figure 4 A first clamping member 6 is slidably arranged in each long groove 8. The first clamping member 6 includes two mutually parallel first arc pieces 61 and second arc pieces 62, and the radius of the first arc piece 61 is smaller than the radius of the second arc piece 62, and the difference between their radii is equal to the wall thickness of the concrete-filled steel tube column 1. A shear key 7 is welded to the side of the first arc piece 61 away from the second arc piece 62. In this embodiment, it is preferred that the shear key 7 is in the shape of a right trapezoid, and the vertical right-angled side of the shear key 7 is fully welded to the first arc piece 61. A bottom plate is welded to the bottom of the first clamping assembly. After adjusting the positions of the four first clamping members 6 relative to the long groove 8 according to the diameter of the concrete-filled steel tube column 1, the bottom plate is fixedly connected to the steel plate 3 by high-strength bolts, so as to fix the first clamping member 6.

[0056] Refer to Figure 4 and Figure 5, a second clamping member 9 corresponding to the number of shear keys 7 is welded to the inner wall of the concrete-filled steel tube column 1. The second clamping member 9 includes two first clamping pieces 91 and second clamping pieces 92 arranged in parallel with each other, and the distance between the first clamping piece 91 and the second clamping piece 92 is the same as the thickness of the shear key 7. When the concrete-filled steel tube column 1 is hoisted, the concrete-filled steel tube wall is inserted into the first clamping member 6, and at the same time, the shear key 7 is inserted into the second clamping member 9, which limits the hoisting position of the concrete-filled steel tube column 1, improves the construction accuracy and reduces the construction error.

[0057] Refer to Figure 2 , the wall of the concrete-filled steel tube column 1 is fixedly connected to the first clamping member 6 by high-strength bolts. The arc section of the wall of the concrete-filled steel tube column 1 where the first clamping member 6 is not provided is fully welded to the steel plate 3, and a rib plate 10 is arranged in the full-welded section of the concrete-filled steel tube column 1. One side of the two adjacent sides of the rib plate 10 is welded to the concrete-filled steel tube column 1, and the other side is welded to the top surface of the steel plate 3.

[0058] Refer to Figure 2 , since the area of the steel plate 3 needs to be larger than the cross-section of the concrete-filled steel tube column 1, and for a large concrete-filled steel tube column 1, the cross-sectional area of the concrete-filled steel tube column 1 is relatively large. To ensure the compaction of the concrete of the bearing platform 2 below the steel plate 3, a number of vibrating holes 12 are opened on the steel plate 3. When pouring the concrete below the bearing platform 2, the construction personnel can vibrate the concrete below the steel plate 3 through the vibrating holes 12 to enhance the compaction of the poured concrete below the steel plate 3.

[0059] The implementation principle of the connection structure between a large concrete-filled steel tube column and a bearing platform in the embodiment of the present application is as follows: The support frame 4 is hoisted onto the cushion layer of the bearing platform 2. After positioning and leveling are completed, the steel bars in the bearing platform 2 are tied. After tying is completed, the steel plate 3 is hoisted. After the fixing grooves 11 on the steel plate 3 are aligned with the vertical rods 41 one by one, the steel plate 3 is hoisted until it abuts against the corbels 43 on the vertical rods 41, and the steel plate 3 is fixedly connected to the corbels 43 by high-strength bolts. After the steel plate 3 is hoisted, the first concrete pouring of the bearing platform 2 is carried out, and the concrete is poured below the plane of the steel plate 3 and at a certain distance from the plane of the steel plate 3.

[0060] After the first concrete placement is completed, adjust the position of the first clamping member 6 relative to the long groove 8 according to the diameter of the concrete-filled steel tube column 1. After the position adjustment is completed, fix the first clamping member 6 to the steel plate 3 with high-strength bolts; hoist the concrete-filled steel tube column 1. During the hoisting process, insert the wall of the concrete-filled steel tube column 1 into the first clamping member 6, and at the same time, insert the shear key 7 on the steel plate 3 into the second clamping member 9 on the inner wall of the concrete-filled steel tube column 1. After the concrete-filled steel tube column 1 is hoisted in place, connect the concrete-filled steel tube column to the first clamping member 6 with high-strength bolts, and fully weld the other end of the concrete-filled steel tube column 1 to the steel plate 3. After the welding is completed, weld the ribbed plate 10 on the outer wall of the concrete-filled steel tube column 1. After the ribbed plate 10 is welded, carry out the second concrete placement of the bearing platform 2 to complete the placement of the entire bearing platform 2.

[0061] The embodiment of the present application also discloses a construction method for connecting a concrete-filled steel tube column and a bearing platform. The construction method includes the following steps:

[0062] S1: Use a measuring instrument to locate the hoisting position of the concrete-filled steel tube column 1. When pouring the cushion layer in the foundation pit of the bearing platform 2, bury a number of steel sleeves at the corresponding positions of several vertical rods 41 of the support frame 4.

[0063] S2: After the cushion layer reaches the specified strength, level the absolute elevation in a number of steel sleeves by increasing or decreasing the number of steel gaskets 53 to make the absolute elevation in each steel sleeve consistent.

[0064] S3: Hoist the support frame 4, and correspond the position of each vertical rod 41 of the support frame 4 to the position of each steel sleeve in the cushion layer for hoisting; after the hoisting is completed, pour the concrete in the steel sleeve.

[0065] S4: After the support frame 4 is installed, carry out the steel bar binding of the bearing platform 2 and the pouring of the concrete of the bearing platform 2. The first concrete placement of the bearing platform 2 can reach a certain distance below the steel plate 3.

[0066] S5: Hoist the steel plate 3. During the hoisting process, align a number of fixed grooves 11 on the steel plate 3 with the vertical rods 41, make the vertical rods 41 pass through the fixed grooves 11, and connect the steel plate 3 and the corbel 43 with bolts.

[0067] S6: Weld the second clamping member 9 inside the steel tube column, and adjust the position of the first clamping member 6 according to the diameter of the steel tube column. After the adjustment is completed, connect the first clamping member 6 and the steel plate 3 with bolts.

[0068] S7: Carry out the hoisting of the steel tube column. During the hoisting process, insert the wall of the steel tube column into the first clamping member 6 on the steel plate 3, and insert the shear key 7 on the steel plate 3 into the second clamping member 9 inside the steel tube column.

[0069] S8: After the hoisting is completed, the second concrete pouring of the bearing platform 2 is carried out. During the pouring process, the concrete under the steel plate 3 is vibrated and compacted through the vibration holes 12. The height of the steel pipe column buried in the bearing platform 2 is obtained by force measurement according to the actual situation of each engineering project.

[0070] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A connecting structure between a large concrete-filled steel tube column and a cast-in-place concrete pile cap, comprising a large concrete-filled steel tube column (1) and a cast-in-place concrete pile cap (2), characterized in that: A steel plate (3) is provided between the concrete-filled steel tube column (1) and the bearing platform (2). A support frame (4) is arranged inside the bearing platform (2), and the steel plate (3) is detachably connected to the support frame (4); An anchor (5) for connecting the steel plate (3) and the bearing platform (2) is arranged on the steel plate (3); A number of first clamping members (6) and a number of shear keys (7) fixedly connected to the first clamping members (6) are further arranged on the steel plate (3); The support frame (4) includes a number of parallel vertical rods (41) and a number of diagonal rods (42) for connecting adjacent vertical rods (41); A corbel (43) for supporting the steel plate (3) is fixedly connected to the vertical rod (41); The first clamping member (6) includes a first arc plate (61) and a second arc plate (62) that are parallel to each other. The first arc plate (61) is used to abut against the inner wall of the concrete-filled steel tube column (1), and the second arc plate (62) is used to abut against the outer wall of the concrete-filled steel tube column (1); The wall of the concrete-filled steel tube column (1) slides up and down inside the first clamping member (6); A number of long grooves (8) facing the center of the steel plate (3) are formed on the steel plate (3), and the first clamping member (6) can slide along the long grooves (8); A number of second clamping members (9) are fixed to the inner wall of the concrete-filled steel tube column (1). The second clamping member (9) includes two first clamping plates (91) and second clamping plates (92) that are arranged parallel to each other. A number of the shear keys (7) slide correspondingly between the first clamping plate (91) and the second clamping plate (92); The concrete-filled steel tube column (1) is bolted to the first arc plate (61) and the second arc plate (62). The part of the bottom of the concrete-filled steel tube column (1) that is not connected to the first clamping member (6) is used to be fixedly connected to the steel plate (3), and a number of ribbed plates (10) fixed to the steel plate (3) are fixedly arranged on the periphery of the concrete-filled steel tube column (1).

2. The connecting structure between a large steel tube concrete column and a bearing platform according to claim 1, characterized in that: A number of anchor holes (51) are formed on the steel plate (3). The anchor (5) includes an anchor bolt (52) passing through the anchor hole (51); The anchor bolt (52) includes an anchor rod (521) and an anchor head (522). A gasket (53) is sleeved on the anchor rod (521), and the gasket (53) is fixedly connected to the steel plate (3).

3. The connecting structure of a large steel tube concrete column and a bearing platform according to claim 1, characterized in that: A tie rod (44) is arranged between two spaced-apart vertical rods (41), and both ends of the tie rod (44) are fixedly connected to the vertical rods (41).

4. The connecting structure between a large steel pipe concrete column and a bearing platform according to claim 1, characterized in that: A number of fixing grooves (11) are formed on the steel plate (3), and the vertical rods (41) correspondingly pass through the fixing grooves (11).

5. A connecting structure between a large steel tube concrete column and a bearing platform according to claim 1, characterized in that: A number of vibrating holes (12) are evenly spaced on the steel plate (3).

6. A construction method for the connection structure between a large concrete-filled steel tubular column and a bearing platform as described in any one of claims 1 to 5, characterized in that, This construction method includes the following steps: S1: Use a measuring instrument to locate the hoisting position of the concrete-filled steel tube column (1). When pouring the cushion layer in the foundation pit of the bearing platform (2), a number of steel sleeves are buried at the corresponding positions of a number of vertical rods (41) of the support frame (4); S2: After the cushion layer reaches the specified strength, level the absolute elevation in a number of steel sleeves, and make the absolute elevation in each steel sleeve consistent by increasing or decreasing the number of steel gaskets (53); S3: Hoist the support frame (4), and hoist each vertical rod (41) of the support frame (4) corresponding to the position of each steel sleeve in the cushion layer one by one; after hoisting, pour the concrete in the steel sleeve. S4: After the support frame (4) is installed, carry out the steel bar binding of the bearing platform (2) and the pouring of the concrete of the bearing platform (2). For the first pouring of the concrete of the bearing platform (2), it is sufficient to pour to a certain distance below the steel plate (3). S5: Hoist the steel plate (3). During the hoisting process, align several fixing grooves (11) on the steel plate (3) with the vertical rods (41), pass the vertical rods (41) through the fixing grooves (11), and connect the steel plate (3) and the corbel (43) with bolts. S6: Weld the second clamping member (9) inside the steel pipe column, and adjust the position of the first clamping member (6) according to the diameter of the steel pipe column. After the adjustment is completed, connect the first clamping member (6) and the steel plate (3) with bolts. S7: Carry out the hoisting of the steel pipe column. During the hoisting process, the wall of the steel pipe column is clamped into the first clamping member (6) on the steel plate (3), and the shear key (7) on the steel plate (3) is clamped into the second clamping member (9) inside the steel pipe column. S8: After the hoisting is completed, carry out the secondary concrete pouring of the bearing platform (2). During the pouring process, vibrate the concrete under the steel plate (3) through the vibration holes (12) until it is dense. The height of the steel pipe column buried in the bearing platform (2) is obtained by force measurement according to the actual situation of each engineering project.

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