CFRP (carbon fiber reinforced plastic) cloth restrained concrete filled steel tube column foundation node

Abstract

The utility model discloses a CFRP cloth constraint steel pipe concrete column foundation node which comprises a foundation component and a preset steel structure, one end of the preset steel structure is pre-buried in the foundation component, a steel pipe concrete structure is arranged on the connecting interface of the foundation component and the preset steel structure, the preset steel structure is wrapped with the steel pipe concrete structure, and the preset steel structure is arranged in the concrete pipe concrete structure. And CFRP cloth is wound outside the steel pipe concrete structure. The utility model can solve the problems of insufficient rigidity and bearing capacity and inconvenient construction of the concrete filled steel tubular column base connecting node in the prior art.

Description

Technical Field

[0001] The utility model belongs to the technical field of steel tube concrete columns, and in particular relates to a CFRP cloth constrained steel tube concrete column base node. Background Art

[0002] In recent years, concrete-filled steel tubes (CFST) have been widely accepted for use in high-rise buildings and bridge systems. The restraint provided by the steel tube can significantly improve the strength and ductility of the core concrete. In addition, the core concrete limits the inward buckling of the steel tube, and the steel tube can be used as a formwork for concrete pouring. Thin-walled steel tubes are becoming increasingly popular and are recommended for use in CFST columns due to their economic benefits. However, the complex construction process of CFST column foundation connections remains an engineering problem that is time-consuming and labor-intensive. There are three types of traditional CFST column foundation connections, namely, open-bottom plate connection, buried connection, and concrete-wrapped column connection.

[0003] For buried connections, i.e. embedded connections, the buried depth is sufficient, and the embedded connection provides more reliable stiffness and strength. However, it is difficult to achieve a large buried depth of steel pipes. If the embedded pipes are embedded very deeply, the stiffness and strength will theoretically increase, but it is generally difficult to do so during construction, and the design will not bury them too deep, which will also affect the configuration of the foundation steel cage. When the concrete-wrapped column connection is applied to steel tube concrete columns, the stiffness and bearing capacity of the steel tube concrete column foundation connection can be improved. However, the construction process is still complicated, and the load transfer mechanism is also complicated. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a CFRP cloth constrained steel tube concrete column foundation node, which can solve the problems of insufficient stiffness and bearing capacity of the steel tube concrete column foundation connection node and inconvenience in construction in the prior art.

[0005] The embodiments of the present invention are implemented by the following technical solutions:

[0006] A CFRP cloth-constrained steel tube concrete column foundation node comprises a foundation component and a prefabricated steel structure. One end of the prefabricated steel structure is pre-buried in the foundation component. A steel tube concrete structure is provided at a connection interface between the foundation component and the prefabricated steel structure. The steel tube concrete structure is coated on the prefabricated steel structure, and CFRP cloth is wrapped around the outside of the steel tube concrete structure.

[0007] In one embodiment of the utility model, the steel tube concrete structure includes a steel tube and a concrete layer. The steel tube is sleeved in the prefabricated steel structure, and the concrete layer is poured between the steel tube and the prefabricated steel structure.

[0008] In one embodiment of the present invention, the distance between the steel tube and the upper surface of the foundation component is less than 1 / 5 of the diameter of the steel tube concrete.

[0009] In one embodiment of the present invention, the height of the concrete-filled steel tube is greater than or equal to the diameter of the concrete-filled steel tube.

[0010] In one embodiment of the present invention, the buried depth of the pre-installed steel structure in the foundation component is greater than or equal to 1.5 times the diameter of the steel tube concrete.

[0011] In one embodiment of the utility model, the pre-installed steel structure is an angle steel cage, which includes at least four angle steels and a plurality of tie plates. The four angle steels are distributed in a square shape, and a tie plate is connected between two adjacent angle steels.

[0012] In an embodiment of the present invention, the distance between two adjacent angle steels is smaller than the distance between the steel bars in the foundation component.

[0013] The technical solution of the utility model has at least the following advantages and beneficial effects:

[0014] The utility model improves the rigidity and bearing capacity of the connection node by pre-embedding one end of the prefabricated component in the foundation component. Compared with the concrete-wrapped column connection structure in the prior art, the node form of the utility model is simple in structure and the construction efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of a CFRP cloth-constrained steel tube concrete column foundation node in the utility model;

[0017] Figure 2 It is a top view of the CFRP cloth constrained steel tube concrete column foundation node in the utility model.

[0018] Icon: 1-angle steel cage, 11-angle steel, 12-stitching plate, 2-concrete-filled steel tube, 21-steel tube, 22-concrete, 3-CFRP cloth, 4-foundation component. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0022] In the description of the present utility model, it should be noted that if the terms "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present utility model.

[0023] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "configure", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] Example

[0025] Please refer to Figure 1 and 2, this embodiment provides a CFRP cloth constrained steel tube concrete column foundation node, which includes a foundation component and a pre-placed steel structure. The foundation component is a reinforced concrete structure, in which a steel cage is pre-buried. The pre-placed steel structure can be an angle steel cage, an I-beam, a cross steel, a channel steel, a steel pipe or a lattice steel pipe, etc. This embodiment uses an angle steel cage as the pre-placed steel structure. The angle steel cage includes at least four angle steels and a plurality of tie plates. The four angle steels are distributed in a square shape, and a tie plate is connected between two adjacent angle steels. The bottom end of the angle steel cage is pre-buried in the foundation component, and the spacing between two adjacent angle steels is smaller than the spacing of the steel bars in the foundation component to avoid the steel bars in the foundation component. A steel tube concrete structure is provided at the connection interface between the foundation component and the pre-placed steel structure. The steel tube concrete structure refers to a steel pipe being sleeved on the angle steel cage, and concrete is poured between the steel pipe and the angle steel cage. CFRP cloth is wrapped around the outside of the steel tube concrete structure, that is, CFRP cloth is wrapped around the outer surface of the steel pipe for constraint, which prevents corrosion of the steel pipe and limits the outward buckling of the steel pipe.

[0026] This embodiment improves the stiffness and bearing capacity of the connection node by pre-embedding the bottom end of the angle steel cage in the foundation component. Compared with the concrete-wrapped column connection structure in the prior art, the node form of this embodiment is simple in structure and improves the construction efficiency. This embodiment sets a steel tube concrete structure at the connection interface between the angle steel cage and the foundation component to strengthen the node stiffness and improve the seismic performance.

[0027] It should be noted that the distance between the steel pipe and the upper surface of the foundation component is less than 1 / 5 of the diameter of the steel tube concrete pipe to maintain the continuity of the connection node stiffness. If the distance between the steel pipe and the upper surface of the foundation component is too large, only the concrete and the angle steel cage will connect the foundation component, which will lead to insufficient node stiffness. There is no restriction on the minimum distance between the steel pipe and the upper surface of the foundation component, and technical personnel in this field can design it according to the needs of convenient construction. Moreover, the distance between the steel pipe and the upper surface of the foundation component is designed because after the node is subjected to the force transmitted from the upper structure, the steel tube concrete structure will be deformed by force, that is, bulge in the horizontal direction. By designing the distance between the steel pipe and the upper surface of the foundation component, space is left for the deformation of the steel tube concrete structure to avoid damage to the foundation component.

[0028] The "steel tube concrete diameter" mentioned in this article refers to the outer diameter of the steel tube.

[0029] It should be noted that the height of the steel tube concrete is greater than or equal to the diameter of the steel tube concrete pipe to resist the bending moment and shear force transmitted from the upper structure of the pile. Because when the height of the steel tube concrete is greater than or equal to the diameter of the steel tube concrete pipe, under the action of bending moment and shear force, the steel tube concrete structure within this height is the core area of ​​destruction.

[0030] It should be noted that the buried depth of the pre-placed steel structure in the foundation component is greater than or equal to 1.5 times the diameter of the steel tube concrete, to ensure the effective connection between the foundation and the node after the force is transmitted, and to prevent the pre-placed steel structure from being pulled out of the foundation component.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A CFRP cloth constrained concrete-filled steel tube column foundation node, characterized in that: It includes a foundation component and a prefabricated steel structure. One end of the prefabricated steel structure is embedded in the foundation component. A steel tube concrete structure is provided at the connection interface between the foundation component and the prefabricated steel structure. The steel tube concrete structure is coated on the prefabricated steel structure, and CFRP cloth is wrapped around the outside of the steel tube concrete structure.

2. The CFRP cloth-constrained concrete-filled steel tube column foundation node according to claim 1, characterized in that: The steel tube concrete structure comprises a steel tube and a concrete layer. The steel tube is sleeved in the prefabricated steel structure, and the concrete layer is poured between the steel tube and the prefabricated steel structure.

3. The CFRP cloth-constrained concrete-filled steel tube column foundation node according to claim 2, characterized in that: The distance between the steel tube and the upper surface of the foundation component is less than 1 / 5 of the diameter of the steel tube concrete.

4. The CFRP cloth-constrained concrete-filled steel tube column foundation node according to claim 2, characterized in that: The height of the steel tube concrete is greater than or equal to the diameter of the steel tube concrete.

5. The CFRP cloth-constrained concrete-filled steel tube column foundation node according to claim 2, characterized in that: The buried depth of the pre-installed steel structure in the foundation component is greater than or equal to 1.5 times the diameter of the steel tube concrete.

6. The CFRP cloth-constrained concrete-filled steel tube column foundation node according to claim 1, characterized in that: The prefabricated steel structure is an angle steel cage, which includes at least four angle steels and a plurality of tie plates. The four angle steels are distributed in a square shape, and a tie plate is connected between two adjacent angle steels.

7. The CFRP cloth-constrained concrete-filled steel tube column foundation node according to claim 6, characterized in that: The distance between two adjacent angle steels is smaller than the distance between the steel bars in the foundation component.

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