Steel-concrete connecting structure of steel pipe column and bearing platform

Abstract

The utility model discloses a steel-concrete connecting structure of a steel pipe column and a bearing platform, relates to the field of steel-concrete structures, and aims to solve the problems that the existing steel-concrete connecting structure is poor in combinability and insufficient in bearing capacity. The contact area between the side face of the base column and the concrete bearing platform is increased through the stiffening plates, the penetrating ribs penetrate through the two different stiffening plates to achieve an anchoring structure, the bonding strength between the base column and concrete is improved, and therefore the stable bearing capacity of the steel pipe column is guaranteed, and the rigidity and the anti-seismic property are improved.

Description

Technical Field

[0001] The utility model relates to the field of steel - concrete structures, and particularly relates to a steel - concrete connection structure between a steel pipe column and a bearing platform. Background Art

[0002] The connection between a steel structure pier column and a bearing platform often adopts several forms such as an exposed type, an encased type, and an embedded type. The exposed type column foot often uses bolts and anchor bars for connection, and this connection has problems such as low bearing capacity and insufficient stability. Based on the exposed type column foot, the encased type column foot connection has a certain height at the bottom of the steel column wrapped with reinforced concrete. However, this connection has poor wrapping performance and is prone to risks such as cracking of the encased concrete and deviation of the pier column.

[0003] The embedded connection usually adopts methods such as steel bar lapping, grouting sleeves, and perforating the column body to set through - bars. For the case of large column - top loads, the above - mentioned connections have problems such as poor combination between the pier column and the bearing platform, low bearing capacity, small stiffness, and poor seismic performance. At the same time, the connection between the steel - concrete connection structure on the bearing platform and the steel pipe column mostly only uses welding or only uses bolt connection, with low butt - joint accuracy, low strength of the connection node, and weak anti - fatigue ability. Content of the Utility Model

[0004] The purpose of the utility model is to address the defects existing in the prior art, and provide a steel - concrete connection structure between a steel pipe column and a bearing platform. A steel - concrete connection component is used to establish a base structure for bearing the steel pipe column. One end of the base column is embedded in the concrete bearing platform, and the side surface of the base column is provided with stiffening plates to increase the contact area with the concrete bearing platform. An anchoring structure is realized by passing a through - bar through two different stiffening plates, so as to improve the bonding strength between the base column and the concrete, thereby ensuring the stable bearing capacity of the steel pipe column, and improving the stiffness and seismic performance.

[0005] To achieve the above purpose, the following technical solutions are adopted:

[0006] A steel - concrete connection structure between a steel pipe column and a bearing platform, comprising:

[0007] A concrete bearing platform;

[0008] A base column, one end of which extends into the concrete bearing platform and is provided with an end steel plate, and the other end is located outside the concrete bearing platform and is provided with a flange for butt - jointing with the steel pipe column; a plurality of stiffening plates are connected to the outer circumferential surface of the section of the base column located in the concrete bearing platform, through - holes are formed on the stiffening plates, a through - bar sequentially passes through the through - holes on two different stiffening plates, and both ends of the through - bar extend beyond the range of the stiffening plates, and the axis of the through - bar is orthogonal to the axis of the base column.

[0009] Furthermore, a steel bar mesh is pre - embedded in the concrete bearing platform, and the steel bar mesh is located between the bottom surface of the concrete bearing platform and the end steel plate.

[0010] Further, the steel bar mesh includes transverse bars, longitudinal bars, and vertical bars that are perpendicularly distributed to each other. Multiple transverse bars and multiple longitudinal bars are connected to form a grid-like structure, and the axis of the vertical bar is perpendicular to the plane where the grid-like structure is located and is connected to the transverse bars and longitudinal bars.

[0011] Further, the plane where the end steel plate is located is perpendicular to the axis of the base column. The base column is a cylindrical structure filled with concrete, and the end steel plate seals one end of the base column.

[0012] Further, the stiffening plates are distributed along the generatrix of the outer circumferential surface of the base column. One end of the stiffening plate is butted against the end steel plate, and the multiple stiffening plates are evenly spaced circumferentially around the base column.

[0013] Further, a plurality of through holes are sequentially and spacedly provided on the stiffening plates along the axial direction of the base column.

[0014] Further, a stiffening rib is connected between the flange plate and the base column, and the stiffening rib is fixedly connected by welding to the end face of the flange plate.

[0015] Further, through holes are provided on the flange plate, and the through holes are used in cooperation with bolts to connect the flange plates at the ends of the steel pipe columns.

[0016] Further, a plurality of stiffening ribs are provided, and they are sequentially and spacedly arranged circumferentially along the flange plate.

[0017] Further, the cross-section of the base column is rectangular or circular.

[0018] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0019] Aiming at the problems of poor bonding property and insufficient bearing capacity of the current steel-concrete connection structure, the present utility model adopts a steel-concrete connection component to establish a base structure for bearing a steel pipe column. One end of the base column is embedded in a concrete pile cap, the contact area between the side surface of the base column and the concrete pile cap is increased through the stiffening plates, and an anchoring structure is realized by using the through bars to pass through two different stiffening plates, so as to improve the bonding strength between the base column and the concrete, thereby ensuring the stable bearing capacity of the steel pipe column and improving the stiffness and seismic performance.

[0020] In the present utility model, a plurality of stiffening ribs are used in cooperation with multiple through bars to contact the concrete pile cap at multiple positions, so that the through bars and the stiffening ribs form a dowel structure in the concrete pile cap, improve the bonding performance between the base column and the concrete pile cap, ensure the stability of the base column in the concrete pile cap, and can effectively improve the strength and anti-fatigue ability.

[0021] The base column in the present utility model is a cylindrical structure. After being filled with concrete, it can form a concrete-filled steel pipe structure, improving the strength and bearing capacity of the base column.

[0022] In the utility model, a flange is arranged on the top of the base column and corresponding stiffening ribs are installed for reinforcement, thereby improving the stability of the flange. After docking with the steel pipe column, the strength of the connection position can be ensured, and the docking accuracy and construction convenience can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the steel-concrete connection structure of the steel pipe column and the cap in the embodiment of the utility model.

[0024] Figure 2 It is a schematic diagram of the coordination between the concrete cap and the base column in the embodiment of the utility model.

[0025] Figure 3 It is a structural schematic diagram of the base column in the embodiment of the utility model.

[0026] Figure 4 It is a schematic diagram of the connection between the base column and the steel pipe column in the embodiment of the utility model.

[0027] Figure 5 It is a schematic diagram of the through ribs arranged on the base column in the embodiment of the utility model.

[0028] Figure 6 It is a schematic diagram of the structure of the flange in the embodiment of the utility model.

[0029] Figure 7 It is a schematic diagram of the stiffening rib in the embodiment of the utility model.

[0030] Figure 8 It is a schematic diagram of a steel mesh in an embodiment of the utility model.

[0031] Explanation of numbers (in order of first appearance): 10—concrete cap, 20—steel-concrete connection assembly, 21—base column, 22—stiffening plate, 23—through reinforcement, 24—end steel plate, 30—steel pipe column, 40—steel mesh, 41—transverse reinforcement, 42—longitudinal reinforcement, 43—vertical reinforcement, 50—external flange, 51—flange, 52—bolt, 53—stiffening rib, 54—open weld, 60—self-compacting slightly expansive concrete. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0033] Currently, the existing embedded steel-concrete connection structure has problems such as poor bonding performance between the pier column and the bearing platform and low bearing capacity. Based on this, this embodiment provides a steel-concrete connection structure between a steel pipe column 30 and a bearing platform. Stiffening plates 22 are provided on the section where the base column 21 is inserted into the concrete bearing platform 10 to increase the bonding ability between the two, and perforating bars 23 are arranged on the stiffening plates 22 to achieve the dowel anchoring effect between the stiffening plates 22 and the concrete bearing platform 10, thereby improving the strength of the connection and ensuring the bearing capacity, and solving the problems existing in the traditional embedded steel-concrete connection structure.

[0034] As Figure 1 shown, the steel-concrete connection structure between the steel pipe column 30 and the bearing platform mainly includes a concrete bearing platform 10 and a steel-concrete connection assembly 20. The steel-concrete connection assembly 20 includes a base column 21, a stiffening plate 22, and a perforating bar 23. Among them, one end of the base column 21 extends into the concrete bearing platform 10 and is provided with an end steel plate 24 to improve the anchoring performance of the bottom of the base column 21, and the other end is located outside the concrete bearing platform 10 and is provided with a flange 51 to establish a docking base for docking the steel pipe column 30. Stiffening plates 22 are distributed on the section of the base column 21 located in the concrete bearing platform 10, and the perforating bars 23 pass through the stiffening plates 22 to form a pin structure, optimizing the combined force transfer between the stiffening plates 22, the perforating bars 23, and the concrete, and improving the bearing capacity.

[0035] Among them, as Figure 3 shown, the concrete bearing platform 10 serves as the foundation of the entire structure, providing a stable support environment. It is usually a precast or cast-in-place reinforced concrete structure, or an existing concrete foundation can be used as the concrete bearing platform 10, which has sufficient strength and stiffness to bear the loads transmitted from the upper structure.

[0036] One end of the base column 21 is embedded in the concrete bearing platform 10, and the other end is provided with a flange 51 for docking the steel pipe column 30 to achieve the hybrid connection of steel and concrete. The base column 21 is usually made of high-strength steel. The part of the base column 21 embedded in the concrete bearing platform 10 is provided with an end steel plate 24 to enhance the connection with the concrete, and the flange 51 at the other end provides a standardized connection interface for facilitating the docking with the steel pipe column 30.

[0037] The stiffening plate 22 is connected to the outer circumferential surface of the section of the base column 21 located in the concrete bearing platform 10, and is used to increase the contact area with the concrete and improve the bonding strength. The stiffening plate 22 can be made of steel plates and is firmly fixed to the base column 21 by welding or other means. Its shape and quantity are determined according to the design requirements to maximize the contact area and disperse the stress.

[0038] In this embodiment, the stiffening plate 22 adopts a rectangular plate member and is distributed along the generatrix of the outer circumferential surface of the base column 21. One end of the stiffening plate 22 is butt-jointed with the end steel plate 24, and multiple stiffening plates 22 are evenly spaced circumferentially around the base column 21.

[0039] The through holes are formed in the stiffening plate 22, and the through bars 23 pass through these holes to connect two different stiffening plates 22, thereby realizing the anchoring structure. The through holes need to be accurately formed at the predetermined positions of the stiffening plate 22. In this embodiment, the through bars 23 can be made of steel bars. The through bars 23 pass through the different through holes on two different stiffening plates 22, and both ends extend beyond the scope of the stiffening plate 22 and are inserted into the concrete pile cap 10 to form a pre-embedded structure. The axis of the through bar 23 is orthogonal to the axis of the base column 21, so that the upward and downward pulling directions of the base column 21 are perpendicular to the axis of the through bar 23, and the through bar 23 can provide a stable bolt anchoring effect and enhance the anchoring effect.

[0040] Through the mutual combination of the stiffening plate 22 and the through bars 23, the contact area and mechanical biting force between the base column 21 and the concrete pile cap 10 are significantly increased, thereby improving the bonding strength. The stable steel-concrete connection assembly 20 ensures that the steel pipe column 30 can stably transfer the load to the concrete pile cap 10 when subjected to the load, and improves the bearing capacity of the overall structure. The strengthened base column 21 and the anchoring structure make the entire connection structure have higher stiffness and better seismic performance, and can maintain the stability and safety of the structure under extreme conditions such as earthquakes.

[0041] As Figure 1 and Figure 2 shown, a steel bar mesh 40 is pre-embedded in the concrete pile cap 10, and the steel bar mesh 40 is located between the bottom surface of the concrete pile cap 10 and the end steel plate 24. The steel bar mesh 40 is used to ensure the strength of the concrete pile cap 10 and improve the bearing capacity of the concrete pile cap 10.

[0042] As Figure 8 shown, the steel bar mesh 40 is composed of transverse bars 41, longitudinal bars 42 and vertical bars 43 that are distributed perpendicular to each other. Multiple transverse bars 41 and multiple longitudinal bars 42 are connected to form a grid-like structure to enhance the overall strength and stiffness of the pile cap. The axis of the vertical bar 43 is perpendicular to the plane where the grid-like structure is located and is connected to the transverse bar 41 and the longitudinal bar 42. The transverse bar 41, the longitudinal bar 42 and the vertical bar 43 jointly form the steel bar mesh 40, which improves the strength of the steel bar mesh 40 in three-dimensional directions, and thus improves the strength and fatigue resistance of the concrete pile cap 10 after being embedded in the concrete pile cap 10.

[0043] The base column 21 is a cylindrical structure, and the inside is filled with concrete to enhance its bearing capacity. In this embodiment, the concrete filled inside the base column 21 is self-compacting and slightly expanding concrete 60. One end of the base column 21 extends into the concrete pile cap 10, and an end steel plate 24 is provided to block one end thereof. The plane where the end steel plate 24 is located is perpendicular to the axis of the base column 21. After the inside of the base column 21 is filled with concrete, a concrete-filled steel tube structure can be formed, which improves the strength and bearing capacity of the base column 21.

[0044] In addition, in this embodiment, the cross-section of the base column 21 is rectangular or circular, that is, the base column 21 is a rectangular column or a circular column. The cross-section shape of the base column 21 is determined according to the cross-section shape of the steel pipe column 30 docked above to make them consistent, so as to ensure good force transmission after docking. Among them, the cross-section refers to the section perpendicular to the axis direction of the base column 21.

[0045] A plurality of through holes are successively arranged at intervals along the axial direction of the base column 21 on the stiffening plate 22, and each through hole can be penetrated by the penetrating bar 23 to achieve anchoring. As Figure 5 shown, there are 8 stiffening plates 22 distributed on the base column 21. Two adjacent stiffening plates 22 share one penetrating bar 23, and four penetrating bars 23 are distributed around the base column 21. The penetrating bar 23 can pass through the through holes on the stiffening plate 22 and contact the concrete pile cap 10 from multiple positions, so that the penetrating bar 23 and the stiffening rib 53 form a dowel structure in the concrete pile cap 10, improving the bonding performance between the base column 21 and the concrete pile cap 10, ensuring the stability of the base column 21 in the concrete pile cap 10, and effectively enhancing the strength and anti-fatigue ability.

[0046] As Figure 4 and Figure 6 shown, an external flange 50 is provided at one end of the base column 21 outside the concrete pile cap 10. The external flange 50 includes a flange plate 51, bolts 52 and stiffening ribs 53. Among them, the flange plate 51 is butt-connected to the end of the base column 21, and the stiffening rib 53 connects the flange plate 51 and the base column 21. The stiffening rib 53 is welded and fixed to the end face of the flange plate 51 to form an open weld 54, so as to improve the stiffness and stability of the flange plate 51. Through holes are provided on the flange plate 51 to cooperate with the bolts 52 to connect the flange plate 51 at the end of the steel pipe column 30.

[0047] The shape of the stiffening rib 53 is as Figure 7 shown. There are multiple stiffening ribs 53, which are successively arranged at intervals along the circumferential direction of the flange plate 51. In this embodiment, the flange plate 51 is connected to a total of six stiffening ribs 53, and two through holes are opened between two adjacent stiffening ribs 53 for cooperating with the bolts 52. An external flange 50 is also provided at the end of the steel pipe column 30, and the connection between the steel pipe column 30 and the base column 21 is realized by using two external flanges 50.

[0048] During construction, the following process is adopted.

[0049] Construction preparation: Set up a mold outside the forming area of the concrete pile cap 10 and arrange a steel mesh 40 inside the forming area of the concrete pile cap 10.

[0050] Install the steel-concrete connection structure: Place the prefabricated steel-concrete connection assembly 20 (including the base column 21, the stiffening plate 22, the penetrating bar 23, etc.) into the mold and carry out preliminary positioning.

[0051] Pour concrete: Pour concrete in the mold to form the concrete pile cap 10, so that the steel-concrete connection component 20 is firmly connected to the concrete pile cap 10.

[0052] Install the steel pipe column 30: Prefabricate and hoist the steel pipe column 30 above the steel-concrete connection component 20, and accurately dock and fasten it with the steel-concrete connection component 20 through the flange 51 and bolts 52.

[0053] Pour concrete: Pour self-compacting and slightly expanding concrete 60 inside the steel pipe column 30 and the base column 21. Without vibration, the compactness of the pouring can be ensured, and the buckling resistance of the steel pipe under the stressed state can be improved.

[0054] Welding reinforcement: Perform welding reinforcement at the connection of the flange 51 to form a joint form combining bolt 52 connection and welding, and enhance the connection strength.

[0055] The stable steel-concrete connection structure ensures the stable bearing capacity of the steel pipe column 30. The optimized connection structure improves the stiffness and seismic resistance of the overall structure. The use of prefabricated components and standardized connection interfaces simplifies the on-site installation process. Through the accurate docking of the flange 51 and bolts 52, the high precision and reliability of the connection are ensured.

[0056] The specific implementation manners of the utility model have been described in detail above, but they are only examples. The utility model is not limited to the specific implementation manners described above. For those skilled in the art, any equivalent modification or substitution to the utility model is also within the scope of the utility model. Therefore, any equivalent transformation, modification, and improvement made without departing from the spirit and principle of the utility model should be covered by the scope of the utility model.

Claims

1. A steel-concrete connection structure of a steel pipe column and a cap, characterized in that: include: Concrete cap; The base column has one end extending into the concrete pedestal and provided with an end steel plate, and the other end located outside the concrete pedestal and provided with a flange to dock with the steel pipe column; the outer circumferential surface of the segment of the base column located in the concrete pedestal is connected with multiple stiffening plates, and the stiffening plates are provided with through holes. The through ribs pass through the through holes on two different stiffening plates in turn, and the two ends of the through ribs extend outside the range of the stiffening plates respectively, and the axis of the through ribs is orthogonal to the axis of the base column.

2. The steel-concrete connection structure of the steel pipe column and the cap according to claim 1 is characterized in that: A steel mesh is pre-embedded in the concrete cap, and the steel mesh is located between the bottom surface of the concrete cap and the end steel plate.

3. The steel-concrete connection structure of the steel pipe column and the cap according to claim 2 is characterized in that: The steel mesh comprises transverse bars, longitudinal bars and vertical bars which are perpendicularly distributed to each other. A plurality of transverse bars and a plurality of longitudinal bars are connected to form a grid structure. The axis of the vertical bars is perpendicular to the plane where the grid structure is located and is connected to the transverse bars and the longitudinal bars.

4. The steel-concrete connection structure of the steel pipe column and the cap according to claim 1 is characterized in that: The plane where the end steel plate is located is perpendicular to the axis of the base column. The base column is a cylindrical structure filled with concrete. The end steel plate blocks one end of the base column.

5. The steel-concrete connection structure of the steel pipe column and the cap according to claim 1 or 4, characterized in that: The stiffening plates are distributed along the generatrix of the outer circumferential surface of the base column, one end of the stiffening plate is butt-jointed with the end steel plate, and the plurality of stiffening plates are evenly spaced and distributed around the base column in the circumferential direction.

6. The steel-concrete connection structure of the steel pipe column and the cap according to claim 5, characterized in that: The stiffening plate is provided with a plurality of through holes spaced in sequence along the axial direction of the base column.

7. The steel-concrete connection structure of the steel pipe column and the cap according to claim 1 is characterized in that: A stiffening rib is connected between the flange and the base column, and the stiffening rib is fixedly connected to the end surface of the flange by welding.

8. The steel-concrete connection structure of the steel pipe column and the cap according to claim 7, characterized in that: The flange is provided with a through hole, and the through hole cooperates with bolts to connect the flange at the end of the steel pipe column.

9. The steel-concrete connection structure of the steel pipe column and the cap according to claim 7 or 8, characterized in that: There are multiple stiffening ribs, which are arranged in sequence and at intervals along the circumferential direction of the flange.

10. The steel-concrete connection structure of the steel pipe column and the cap according to claim 1, characterized in that: The cross section of the base column is rectangular or circular.

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