Steel pipe-concrete composite column base with t-shaped stiffener

Abstract

The utility model discloses a steel pipe-concrete outer package combined column foot with T-shaped stiffening rib, including steel pipe column, the steel pipe column outside is equipped with the steel reinforcement cage of adaptation, and the steel pipe column is filled with concrete between steel reinforcement cage, the steel pipe column circumference side wall is circularly distributed with a plurality of stiffening parts for improving the contact area with concrete, and the length of stiffening part is adapted with the length of steel pipe column, and the overlap steel bar is equipped between stiffening part and steel reinforcement cage. The utility model is used to improve the combination area of steel pipe column and concrete, to improve the bearing capacity of steel pipe column combined column foot, to satisfy the demand of larger tonnage building.

Description

Technical Field

[0001] This utility model relates to the field of composite structure technology, specifically to a steel pipe-concrete composite column base with T-shaped stiffening ribs. Background Technology

[0002] In the field of steel structure construction, steel columns and concrete foundations are generally connected and transitioned using embedded column bases or external composite column bases, with external composite column bases being the most widely used. External composite column bases typically involve setting up a foundation pit below ground level, placing a steel pipe column within the pit, and installing a reinforcing cage on the outside of the steel pipe column. After installing the column formwork, concrete is poured to form the steel pipe column composite column base.

[0003] In existing technologies, the contact area between the steel pipe column and the concrete in the outer composite column base is basically the area of ​​the outer wall of the steel pipe column, which limits the contact area with the concrete. This results in limited bonding strength between the steel pipe column and the concrete, and insufficient load-bearing capacity of the steel pipe column composite column base after later molding, making it difficult to support buildings with larger tonnage. Utility Model Content

[0004] The purpose of this utility model is to provide a steel pipe-concrete composite column base with T-shaped stiffening ribs to increase the bonding area between the steel pipe column and the concrete, thereby improving the load-bearing capacity of the steel pipe column composite column base to meet the needs of larger tonnage buildings.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following solution:

[0006] A steel pipe-concrete composite column base with T-shaped stiffening ribs includes a steel pipe column, a reinforcing cage on the outside of the steel pipe column, a suitable template on the outside of the reinforcing cage, and concrete filling the space between the steel pipe column and the template. The circumferential sidewall of the steel pipe column has multiple stiffening parts distributed in a ring to increase the contact area with the concrete. The length of the stiffening parts is adapted to the length of the steel pipe column, and lapped reinforcing bars are provided between the stiffening parts and the reinforcing cage.

[0007] In this scheme, stiffening ribs are added to the outer wall of the steel pipe column, based on the existing composite column base. The stiffening ribs effectively delay local buckling by increasing the stiffness of the side wall of the steel pipe column. The stiffening ribs act as supporting edges, distributing the load over a larger area and reducing stress concentration. This allows the composite column to maintain high load-bearing capacity under complex loading conditions. The stiffening ribs are connected to the reinforcing cage by lapped reinforcing bars, forming a composite force-bearing system of "steel pipe-stiffening rib-reinforcing cage-concrete". After the concrete is filled, the T-shaped section of the stiffening ribs increases the contact area with the concrete, improves the interfacial bonding force, makes the stress transfer more uniform, avoids local damage, and improves the load-bearing capacity of the ribbed steel pipe column composite column, which can meet the needs of larger tonnage buildings.

[0008] Optionally, the stiffening part includes a T-shaped stiffening rib, one end of which is welded to the side wall of the steel pipe column, and the other end is connected to the steel cage through lapped reinforcing bars.

[0009] Optionally, the T-shaped stiffening rib includes a first stiffening plate, a second stiffening plate, and a first stud. One long side of the first stiffening plate is welded to the side of the second stiffening plate to form a T-shape, and the other long side is welded to the side wall of the steel pipe column. The first studs are arranged in a rectangular array on the side of the second stiffening plate away from the steel pipe column. A connecting column is provided between two adjacent first studs along the width direction of the second stiffening plate. One end of the lapped reinforcing bar is connected to the connecting column, and the other end is connected to the reinforcing cage.

[0010] Optionally, the lapped reinforcing bar is S-shaped, with one end hooked onto the longitudinal reinforcing bar of the reinforcing cage and the other end tied to the connecting column with wire.

[0011] Optionally, a base plate is fixed to the bottom surface of the steel pipe column. The base plate is welded to the bottom ends of the first stiffening plate and the second stiffening plate. Several through holes are distributed in a ring on the top surface of the base plate. A screw is inserted into the through hole. The lower end of the screw extends vertically downward. Locking nuts that are threadedly connected to the screw are provided on both the top and bottom surfaces of the base plate.

[0012] Optionally, a tension nut is threaded onto the lower end of the screw.

[0013] Optionally, a reinforcing plate is welded between the top surface of the base plate and the side wall of the steel pipe column, and multiple reinforcing plates are distributed along the circumference of the steel pipe column.

[0014] Optionally, the top surface of the base plate has multiple sets of vertical reinforcing bars distributed in a ring on the outside of the steel pipe column. Each set of vertical reinforcing bars contains two reinforcing bars, and stirrups are provided between the vertical reinforcing bars and the corresponding longitudinal reinforcing bars on the reinforcing cage.

[0015] Optionally, one end of the stirrup is tied to two longitudinal reinforcing bars with wire, and the other end is tied to two vertical reinforcing bars with wire.

[0016] Optionally, the inner wall of the steel pipe column has a number of second studs arranged in a ring, and the outer wall has a number of third studs arranged in a ring. A top plate for installing the building is welded to the top of the steel pipe column, and the bottom surface of the top plate is welded to the top of the first stiffening plate and the second stiffening plate.

[0017] The beneficial effects of this utility model are:

[0018] In this invention, a stiffening section is added to the outer wall of the steel pipe column, based on the existing steel pipe column composite column base. The stiffening rib increases the stiffness of the steel pipe column sidewall, effectively delaying local buckling. As a supporting edge, the stiffening section distributes the load over a larger area, reducing stress concentration, and enabling the composite column to maintain high load-bearing capacity under complex geological conditions. The stiffening section is connected to the reinforcing cage through lapped reinforcing bars, forming a composite force-bearing system of "steel pipe-stiffening rib-reinforcing cage-concrete". After the concrete is filled, the T-shaped cross-section of the stiffening rib increases the contact area with the concrete, improves the interfacial bonding force, makes stress transmission more uniform, avoids local damage, and improves the load-bearing capacity of the ribbed steel pipe column composite column, which can meet the needs of larger tonnage buildings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0021] Reference numerals: 1-Steel pipe column, 2-Third stud, 3-Locking nut, 4-Second stiffening plate, 5-Connecting column, 6-First stud, 7-Lap reinforcement, 8-Stirrup, 9-Longitudinal reinforcement, 10-Reinforcement cage, 11-First stiffening plate, 12-Base plate, 13-Second stud, 14-Threaded rod, 15-Combined steel pipe column base, 16-Concrete, 17-Building, 18-Top plate, 19-Strengthening plate, 20-Vertical reinforcement, 21-Tension nut, 22-Foundation concrete. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0023] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "have," "install," "connect," and "connect" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Example

[0026] A steel pipe-concrete composite column base with T-shaped stiffening ribs includes a steel pipe column 1, a reinforcing cage 10 on the outside of the steel pipe column 1, a matching template on the outside of the reinforcing cage 10, and concrete 16 filling the space between the steel pipe column 1 and the template. The circumferential sidewall of the steel pipe column 1 has multiple stiffening parts distributed in a ring to increase the contact area with the concrete 16. The length of the stiffening parts is adapted to the length of the steel pipe column 1, and lapped reinforcing bars 7 are provided between the stiffening parts and the reinforcing cage 10.

[0027] In this embodiment, based on the existing steel pipe column composite column base 15, such as Figure 1 and Figure 2 As shown, a stiffening section is added to the outer wall of the steel pipe column 1. The stiffening rib increases the stiffness of the side wall of the steel pipe column 1, effectively delaying local buckling. The stiffening section acts as a support edge, distributing the load to a larger area and reducing stress concentration, so that the composite column 1 can still maintain high load-bearing capacity under complex geological conditions. The stiffening section is connected to the reinforcing cage 10 through lapped reinforcing bars 7, forming a composite force-bearing system of "steel pipe-stiffening rib-reinforcing cage-concrete". After the concrete 16 is filled, the T-shaped section of the stiffening rib increases the contact area with the concrete 16, improves the interfacial bonding force, makes the stress transmission more uniform, avoids local damage, and improves the load-bearing capacity of the ribbed steel pipe column 1 composite column, which can meet the needs of larger tonnage buildings 17.

[0028] Furthermore, the stiffening part includes a T-shaped stiffening rib, one end of which is welded to the side wall of the steel pipe column 1, and the other end is connected to the steel cage 10 through a lapped steel bar 7.

[0029] Specifically, such as Figure 2As shown, the T-shaped stiffening ribs are welded to the steel pipe column 1 using full penetration welding to ensure that the weld strength is not lower than that of the base material. The axial force and bending moment borne by the steel pipe column 1 are transferred to the stiffening ribs through the weld, avoiding local stress concentration. The stiffening ribs are tied to the main reinforcement of the steel cage 10 by lapped reinforcing bars 7, eliminating the need for welding and saving installation time. The tensile strength of the steel cage 10 is combined with the compressive / shear strength of the stiffening ribs to form a "steel-concrete" composite stress system. The lapped reinforcing bars 7 transfer the tensile stress in the concrete 16 to the steel cage 10, and then disperse it to the steel pipe column 1 through the stiffening ribs, preventing the concrete 16 from cracking.

[0030] The "supporting edge" function of stiffening ribs: The T-shaped cross section enables stiffening ribs to have both lateral stiffening and longitudinal force transmission functions.

[0031] The effect of confined concrete 16: The stiffening ribs restrict the local buckling of the steel tube column 1, while forcing the concrete 16 into a triaxial compression state, thereby improving its strength and deformation capacity.

[0032] Interface bond strengthening: The T-shaped stiffening ribs increase the contact area between the concrete 16 and the steel pipe column 1. Combined with the mechanical interlocking effect of the lapped steel bars 7, the interface bond strength is increased by more than 40%.

[0033] Furthermore, the T-shaped stiffening rib includes a first stiffening plate 11, a second stiffening plate 4, and a first stud 6. One long side of the first stiffening plate 11 is welded to the side of the second stiffening plate 4 to form a T-shape, and the other long side is welded to the side wall of the steel pipe column 1. The first studs 6 are arranged in a rectangular array on the side of the second stiffening plate 4 away from the steel pipe column 1. A connecting column 5 is provided between two adjacent first studs 6 along the width direction of the second stiffening plate 4. One end of the lapped reinforcing bar 7 is connected to the connecting column 5, and the other end is connected to the reinforcing cage 10.

[0034] Specifically, such as Figure 2 As shown, the first stiffening plate 11 (vertical web) serves as the vertical support for the T-shaped section. One long side is welded to the side wall of the steel pipe column 1, and the other long side is welded to the middle of the side of the second stiffening plate 4, forming a rigid T-shaped node. The second stiffening plate 4 (transverse flange) serves as a transition layer between the concrete 16 and the steel pipe column 1. It is connected to the reinforcing cage 10 through the first stud 6 and the connecting column 5, expanding the contact area of ​​the concrete 16. In practice, holes or grooves can be made on the surface of the first stud 6 and the connecting column 5 to enhance the bonding force with the concrete 16. The first stud 6 firmly connects the second stiffening plate 4 and the concrete 16 through mechanical interlocking, preventing interface slippage. The rectangular array of the first stud 6 is arranged to uniformly transfer stress and avoid local failure.

[0035] The shear bearing capacity of a single stud can reach 50-100kN. After being arranged in a rectangular array, the shear strength of the interface between the stiffening rib and the concrete 16 is increased by more than 3 times. The surface of the second stiffening plate 4 can also be textured. The mechanical interlocking effect between the textured surface and the stud increases the interfacial bonding strength by more than 50%.

[0036] One end of the lapped steel bar 7 is tied to the connecting column 5, and the other end is connected to the main reinforcement of the steel cage 10, forming a continuous force transmission system of "stiffening rib → connecting column → lapped steel bar → steel cage". This design combines the tensile strength of the steel cage 10 with the compressive / shear strength of the stiffening rib, avoiding a sudden drop in bearing capacity caused by cracking of the concrete 16.

[0037] Furthermore, the lapped reinforcing bar 7 is S-shaped, with one end hooked onto the longitudinal reinforcing bar 9 of the reinforcing cage 10, and the other end tied to the connecting column 5 with wire.

[0038] Specifically, the reinforcing cage 10 is usually made of circumferential reinforcing bars and longitudinal reinforcing bars 9 tied together (existing technology). One end of the lapped reinforcing bar 7 is connected to the longitudinal reinforcing bar 9 of the reinforcing cage 10 by means of hooking, which can speed up the laying efficiency of the lapped reinforcing bar 7.

[0039] Furthermore, a base plate 12 is fixed to the bottom surface of the steel pipe column 1. The base plate 12 is welded to the bottom ends of the first stiffening plate 11 and the second stiffening plate 4. Several through holes (not shown in the figure) are distributed in a ring on the top surface of the base plate 12. A screw 14 is inserted into the through holes. The lower end of the screw 14 extends vertically downward. Locking nuts 3 that are threadedly connected to the screw 14 are provided on both the top and bottom surfaces of the base plate 12.

[0040] Specifically, such as Figure 1 As shown, the base plate 12 is a steel plate. The base plate 12 serves as a transitional component connecting the steel pipe column 1 and the foundation, dispersing the concentrated force at the bottom of the composite column into a ring-shaped distribution force, thus avoiding local stress concentration that could lead to cracking of the foundation concrete 22. The locking nut 3 securely fixes the upper end of the screw rod 14 to the circumference of the base plate 12. After the screw rod 14 is connected to the foundation concrete 22, it enhances the connection performance between the steel pipe column 1 and the foundation concrete 22. The foundation is pre-constructed. After the composite column is formed, it is connected to the exposed screw rod 14 on the foundation. The foundation is a supporting structure composed of the foundation concrete 22 and the screw rod 14. The foundation belongs to the prior art.

[0041] Furthermore, a tensile nut 21 is threadedly connected to the lower end of the screw 14.

[0042] Specifically, such as Figure 1 As shown, in traditional designs, the lower end of the screw 14 relies on the bond strength of the foundation concrete 22 or bending anchorage (such as a 90° hook) to provide pull-out resistance. However, the bond strength is easily affected by the quality and curing conditions of the foundation concrete 22, and bending anchorage requires additional processing and may damage the screw 14.

[0043] After the addition of the tension nut 21, the lower end of the screw 14 is connected to the tension nut 21 through the thread, which converts the tensile force into the mechanical interlocking force between the tension nut 21 and the foundation concrete 22, and the pull-out reliability is significantly improved.

[0044] Furthermore, a reinforcing plate 19 is welded between the top surface of the base plate 12 and the side wall of the steel pipe column 1, and multiple reinforcing plates 19 are distributed along the circumference of the steel pipe column 1.

[0045] Specifically, such as Figure 1 As shown, in traditional designs, the steel pipe column 1 and the base plate 12 are connected only by fillet welds or bevel welds. The stiffness of the joint depends on the weld strength and the wall thickness of the steel pipe. Under eccentric loads or seismic action, the joint is prone to local buckling or weld tearing. After adding the reinforcing plate 19, a composite section of "steel pipe-reinforcing plate-base plate" is formed, which significantly increases the moment of inertia of the joint section. The reinforcing plate 19 is connected to the steel pipe column 1 and the base plate 12 by welding, transferring the stress concentration at the root of the weld to the weld area between the reinforcing plate 19 and the steel pipe, reducing the probability of weld fatigue crack initiation.

[0046] Furthermore, the top surface of the base plate 12 has multiple sets of vertical reinforcing bars 20 arranged in a ring on the outside of the steel pipe column 1. Each set of vertical reinforcing bars 20 contains two reinforcing bars, and stirrups 8 are provided between the vertical reinforcing bars 20 and the corresponding longitudinal reinforcing bars 9 on the reinforcing cage 10.

[0047] Furthermore, one end of the stirrup 8 is tied to two longitudinal reinforcing bars 9 with wire, and the other end is tied to two vertical reinforcing bars 20 with wire.

[0048] Specifically, such as Figure 2 As shown, multiple sets of vertical reinforcing bars 20 are distributed in a ring on the outside of the steel pipe column 1, and each set contains two reinforcing bars. These vertical reinforcing bars 20 are connected to the corresponding longitudinal reinforcing bars 9 on the reinforcing cage 10 by stirrups 8. The stirrups 8 play a role in restraint and fixation, tightly combining the vertical reinforcing bars 20 and the longitudinal reinforcing bars 9 to form an organic whole, which greatly enhances the integrity and stability of the structure and can effectively resist various external forces, such as seismic forces and wind loads.

[0049] The stirrups 8 mainly bear shear force in the structure. When the structure is subjected to lateral loads, the stirrups 8 can restrict the relative slippage between the concrete 16 and the steel bars, prevent the expansion of diagonal cracks in the concrete 16, and thus improve the shear bearing capacity of the structure. This arrangement makes the structure safer and more reliable when subjected to complex loads.

[0050] The ring-shaped vertical reinforcing bars 20 and stirrups 8 form a certain constraint ring on the steel pipe column 1, which can limit the vertical and horizontal deformation of the steel pipe column 1 and improve the stability and load-bearing capacity of the steel pipe column 1. This constraint effect is particularly important when the steel pipe column 1 is subjected to large axial pressure or eccentric load.

[0051] The stirrups 8 are tied with the two longitudinal reinforcing bars 9 and the two vertical reinforcing bars 20 using wire, which saves more time compared to welding.

[0052] Furthermore, the inner wall of the steel pipe column 1 has a number of second studs 13 arranged in a ring, and the outer wall has a number of third studs 2 arranged in a ring. The top of the steel pipe column 1 is welded with a top plate 18 for installing the building 17. The bottom surface of the top plate 18 is welded to the top of the first stiffening plate 11 and the second stiffening plate 4.

[0053] Specifically, such as Figure 2 As shown, a number of second studs 13 are arranged in a ring array on the inner side wall of the steel pipe column 1. When the steel pipe column 1 needs to be filled with concrete 16, the second studs 13 can significantly enhance the bonding force and mechanical interlocking force between the steel pipe and the internal concrete 16. This strong connection can effectively prevent relative slippage between the steel pipe and the concrete 16, ensure that the two work together to bear the load, and improve the integrity and stability of the structure.

[0054] The third studs 2 in the annular array on the outer wall can play a similar role in reinforcing the connection when the steel pipe column 1 is connected to the concrete 16. They increase the contact area and friction between the steel pipe and the concrete 16, making the connection more secure and reliable.

[0055] The top of the steel pipe column 1 is welded to the top plate 18 for installing the building 17, which provides a stable support foundation for the building 17. The welding method ensures the connection strength and rigidity between the top plate 18 and the steel pipe column 1, and can accurately transfer the load of the building (in this embodiment, the building is a support column of an umbrella-shaped steel structure) to the steel pipe column 1.

[0056] Meanwhile, the stiffening part corresponds to the stress transmission direction of the upper building 17, ensuring the smooth transmission of stress to the upper building 17.

[0057] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of the present utility model and within the spirit and principles of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A steel pipe-concrete composite column base with T-shaped stiffening ribs, comprising a steel pipe column (1), a reinforcing cage (10) provided on the outside of the steel pipe column (1), a suitable formwork provided on the outside of the reinforcing cage (10), and concrete (16) filling the space between the steel pipe column (1) and the formwork, characterized in that, The steel pipe column (1) has multiple stiffening parts distributed in a ring on its circumferential sidewall to increase the contact area with concrete (16). The length of the stiffening parts is adapted to the length of the steel pipe column (1), and lapped reinforcing bars (7) are provided between the stiffening parts and the reinforcing cage (10).

2. The steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 1, characterized in that, The stiffening part includes a T-shaped stiffening rib, one end of which is welded to the side wall of the steel pipe column (1), and the other end is connected to the steel cage (10) through lapped steel bars (7).

3. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 2, characterized in that, The T-shaped stiffening rib includes a first stiffening plate (11), a second stiffening plate (4), and a first stud (6). One long side of the first stiffening plate (11) is welded to the side of the second stiffening plate (4) to form a T-shape, and the other long side is welded to the side wall of the steel pipe column (1). The first studs (6) are arranged in a rectangular array on the side of the second stiffening plate (4) away from the steel pipe column (1). A connecting column (5) is provided between two adjacent first studs (6) along the width direction of the second stiffening plate (4). One end of the lapped reinforcing bar (7) is connected to the connecting column (5), and the other end is connected to the reinforcing cage (10).

4. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 3, characterized in that, The lapped steel bar (7) is S-shaped. One end of the lapped steel bar (7) hooks onto the longitudinal steel bar (9) of the steel cage (10), and the other end is tied to the connecting column (5) with wire.

5. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 1, characterized in that, The bottom surface of the steel pipe column (1) is fixed with a base plate (12). The base plate (12) is welded to the bottom end of the first stiffening plate (11) and the second stiffening plate (4). The top surface of the base plate (12) has several through holes distributed in a ring. A screw (14) is inserted into the through hole. The lower end of the screw (14) extends vertically downward. The top and bottom surfaces of the base plate (12) are provided with locking nuts (3) that are threadedly connected to the screw (14).

6. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 5, characterized in that, The lower end of the screw (14) is threaded with a tension nut (21).

7. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 5, characterized in that, A reinforcing plate (19) is welded between the top surface of the base plate (12) and the side wall of the steel pipe column (1), and multiple reinforcing plates (19) are distributed along the circumference of the steel pipe column (1).

8. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 5, characterized in that, The top surface of the base plate (12) has multiple sets of vertical reinforcing bars (20) located outside the steel pipe column (1) in a ring. Each set of vertical reinforcing bars (20) contains two reinforcing bars. Stirrups (8) are provided between the vertical reinforcing bars (20) and the corresponding longitudinal reinforcing bars (9) on the reinforcing cage (10).

9. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 8, characterized in that, One end of the stirrup (8) is tied to two longitudinal steel bars (9) with wire, and the other end is tied to two vertical steel bars (20) with wire.

10. A steel pipe-concrete composite column base with T-shaped stiffening ribs according to claim 1, characterized in that, The inner wall of the steel pipe column (1) has a number of second studs (13) arranged in a ring, and the outer wall has a number of third studs (2) arranged in a ring. The top of the steel pipe column (1) is welded to a top plate (18) for installing the building (17). The bottom surface of the top plate (18) is welded to the top of the first stiffening plate (11) and the second stiffening plate (4).

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