CN115596084A - Novel assembled concrete filled steel tube beam column node - Google Patents

Abstract

The invention discloses a novel assembly type concrete-filled steel tube beam column node which comprises a concrete-filled steel tube column, a connecting piece and a double-steel-plate concrete beam, wherein the concrete-filled steel tube column is provided with a steel tube column and a steel plate column; the connecting piece comprises an H-shaped hoop piece, special-shaped H-shaped steel and a threaded fastener, the H-shaped hoop piece is fixed at the beam-column joint of the concrete filled steel tubular column through the threaded fastener, and the special-shaped H-shaped steel is integrated with the H-shaped hoop piece through welding; the double-steel-plate concrete beam is internally provided with a groove matched with the special-shaped H-shaped steel and a steel plate, and is fixedly connected with the special-shaped H-shaped steel through a threaded fastener. The steel pipe reinforced concrete column is stable in structure and convenient and fast to install, the hoop effect of the steel pipe enhances the mechanical property of internal concrete, and the added connecting piece enables a beam column node to be integrated after pouring. The combination of the dry connection mode and the wet connection mode enables the node to improve the structural integrity and the seismic performance in the normal use stage without influencing the construction progress.

Description

A new type of prefabricated steel pipe concrete beam-column joint

technical field

The invention relates to the technical field of construction, in particular to a novel fabricated steel pipe concrete beam-column joint.

Background technique

The prefabricated structure has the advantages of fast construction speed, high component quality, energy saving and environmental protection, and a high degree of industrialization. It is one of the key structural forms in my country. With the development of theoretical research and construction technology, steel tube concrete structures are widely used in high-rise civil and industrial buildings. Concrete-filled steel tubes take into account the characteristics of concrete that is not compressive but not tensile and steel that is prone to instability under compression. The concrete wrapped in steel tubes has a higher bearing capacity due to three-dimensional compression, making full use of the advantages of the two materials, so It has higher bearing capacity and ductility and superior seismic performance. And the concrete-filled steel tube structure can realize factory prefabrication and on-site assembly construction, which is a good assembly structure system. The beam-column joints of the prefabricated structure are the key parts that affect the seismic performance, and their connection performance greatly affects the performance of the overall structure. Improving the joint performance of the beam-column joints of the prefabricated structure and the shear capacity of the core area have become the key to promoting the application of prefabricated buildings. important part of. At the same time, the existing dry connection and wet connection of prefabricated beam-column joints have their own shortcomings. The dry connection has poor integrity and seismic performance, and the wet connection is not easy to operate and difficult to construct.

In view of this, in-depth research on the problems existing in the above-mentioned existing prefabricated structures, combined with the steel tube concrete structure, provides an effective joint reinforcement scheme for traditional prefabricated beam-column joints, so this invention was born.

Contents of the invention

In view of the existing technical deficiencies, the purpose of the present invention is to provide a new type of prefabricated concrete-filled steel tube beam-column joint, which solves the problems of weak seismic capacity and insufficient joint connection performance of traditional prefabricated beam-column joints. The combination of wet connection methods improves the dry connection integrity and poor seismic performance, wet connection is not easy to operate, and the construction is more difficult.

In order to solve the above technical problems, the present invention is achieved through the following technical solutions:

A new type of prefabricated concrete-filled steel pipe beam-column node, including concrete-filled steel pipe columns, connectors, and double-steel-steel concrete beams, characterized in that: the steel-steel concrete columns and double-steel-concrete beams are connected by the connectors; Concrete is poured between the steel pipe concrete column and the double steel plate concrete beam joint; the connecting piece includes H-shaped hoop, special-shaped H-shaped steel and threaded fastener, and the H-shaped hoop is fixed by the threaded fastener At the node of the concrete-filled steel tube column-beam column, the special-shaped H-shaped steel is fixedly connected with the adapted H-shaped hoop by welding; the double-steel-plate concrete beam has built-in grooves and steel plates that match the special-shaped H-shaped steel , the double steel plate concrete beam is fixedly connected with the special-shaped H-shaped steel through threaded fasteners.

The upper longitudinal reinforcement of the beam and the lower longitudinal reinforcement opening are reserved at the beam-column node of the steel pipe concrete column.

The H-shaped hoop includes an upper hoop, a lower hoop, and a vertical steel plate. The vertical steel plate is located in the middle of the upper and lower hoops, and forms an H shape by welding with the upper and lower hoops to strengthen beams and columns. The connection stiffness of the upper and lower ends of the node.

The upper hoop protrudes from the lower concrete-filled steel tube column, and is connected to the upper concrete-filled steel tube column through threaded fasteners to realize the connection between the upper and lower concrete-filled steel tube columns.

The upper hoop part is reserved with openings for the longitudinal steel bars at the upper part of the beam, and the lower hoop part is reserved with openings for the longitudinal steel bars at the lower part of the beams, matching the reserved openings for the concrete filled steel pipe columns.

The special-shaped H-shaped steel includes an upper flange, a web and a lower flange, and the ends of one side of the upper flange and the lower flange are both inverted tapered to form a transition effect and prevent stress concentration.

A groove is reserved in the horizontal direction at the end of the double-steel concrete beam to facilitate concrete pouring, and a groove is reserved in the vertical direction at the end of the double-steel concrete beam to connect with the special-shaped H-shaped steel web, and the double-steel concrete beam can be It is supported by placing it on the lower flange of the special-shaped H-shaped steel.

The double steel plates pre-embedded in the double steel plate concrete beam are located on both sides of the vertical groove at the end of the beam, and protrude from the concrete at the end of the beam for a certain distance, and are connected with the H-shaped hoop to form a closed structure.

The double steel plates are connected to the upper longitudinal steel bar and the lower longitudinal steel bar of the beam by welding, and after the upper longitudinal steel bar and the lower longitudinal steel bar of the beam pass through the reserved opening, the double steel plate and the special-shaped H-shaped web are screwed together. Firmware strengthens the connection.

Cross-stiffened steel plates are arranged at the beam-column joints, and the height of the cross-stiffened steel plates is the same as that of the special-shaped H-shaped steel web. The hole reserved for the column and the hole reserved for the H-shaped hoop are suitable.

Compared with the prior art, the present invention has the following beneficial effects:

1. This node makes the steel pipe, steel bar, steel plate and concrete work in one, so that the beam-column joint under this technical scheme can make full use of the excellent seismic performance of steel and concrete. The combination of steel pipe and concrete improves the prefabricated beam-column joint The effectiveness, bearing capacity, ductility and seismic performance of the connection. At the same time, the concrete-filled steel tube column and the double-steel-steel concrete beam can be used as formwork for concrete pouring, and the double-steel-steel concrete beam can be supported on the lower flange of the connecting piece H-shaped steel, which reduces the workload on the construction site, thereby shortening the construction period and improving the construction efficiency. efficiency.

2. The steel tube concrete columns, connectors and double steel plate concrete beams of this node can be prefabricated in advance in the factory, and then transported to the construction site for connection to protect the environment and reduce pollution. The existing prefabricated beam-column joint dry connection method does not directly transmit force and has poor seismic performance. The wet connection method is not easy to operate and has high construction difficulty. The concrete-filled steel tube column and the double-steel concrete beam are reinforced and connected with threaded fasteners. After pouring, the connecting piece is integrated with the steel-filled steel column and the double-steel concrete beam. The dry connection method and the wet connection method are combined to effectively improve the beam-column joints. Excellent connection performance and anti-seismic performance, and the on-site connection is simple and the construction difficulty is low.

Description of drawings

The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the description, and are explained together with the specific embodiments of the present invention, and do not constitute a limitation to the present invention.

Fig. 1 is the overall structural representation of the beam-column node of the present invention;

Fig. 2 is a schematic diagram of a connector of a beam-column node according to the present invention;

Fig. 3 is the double steel plate concrete beam schematic diagram of the beam-column joint of the present invention;

Fig. 4 is the installation schematic diagram of the steel pipe concrete column of the beam-column node of the present invention;

Fig. 5 is the installation schematic diagram of the double steel plate concrete beam of the beam-column node of the present invention;

In the figure: 1. Steel tube concrete column; 11. Cross stiffened steel plate; 2. Connector; 21. H-shaped hoop; 211. Upper hoop; 212. Lower hoop; 213. Vertical steel plate; 22. Special-shaped H-shaped steel; 221. Upper flange; 222. Web plate; 223. Lower flange; 23. Threaded fastener; 3. Double steel plate concrete beam; 31. Double steel plate; Lower longitudinal reinforcement.

detailed description

In order to have a clearer understanding of the technical features, purposes and effects of the present invention, the technical solutions in the examples of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the implementation of the present invention.

As shown in the figure, the present invention provides a new type of prefabricated concrete-filled steel tube beam-column node, including a concrete-filled steel tube column 1, a connector 2 and a double-steel-steel concrete beam 3, and the steel-steel concrete column 1 and the double-steel concrete beam connected at the connector 2 Concrete is poured between the beams 3, and the concrete-filled steel tube column 1, the double-steel-plate concrete beam 3 and the connector 2 are formed into an integral stressed beam-column and beam-column joint through the post-cast concrete.

Among them, the cross-stiffened steel plate 11 is set at the beam-column node of the steel-filled steel tube column 1, and is fixedly connected with the steel-filled steel tube column 1 by welding. Both the steel-filled steel tube column 1 and the cross-stiffened steel plate 11 are reserved with longitudinal steel bars 32 at the upper part of the beam and 33 at the lower part of the beam. The hole is compatible with the reserved steel bar hole of the H-shaped hoop 21, see Fig. 4 and Fig. 5 .

The structure of the connector 2 is shown in FIG. 2 , including an H-shaped hoop 21 , a special-shaped H-shaped steel 22 , and a threaded fastener 23 . The H-shaped hoop 21 is fixed at the beam-column node of the steel pipe concrete column 1 through threaded fasteners 23, and the special-shaped H-shaped steel 22 is fixedly connected with the adapted H-shaped hoop 21 by welding. The H-shaped hoop 21 includes an upper hoop 211, a lower hoop 212 and a vertical steel plate 213. The vertical steel plate 213 is located in the middle of the upper hoop 211 and the lower hoop 212, and is welded to the upper hoop 211. 1. The lower hoop piece 212 forms an H shape to strengthen the connection stiffness of the upper and lower ends of the beam-column joint. The upper ring hoop 211 is reserved with a hole for the longitudinal reinforcement 32 on the upper part of the beam, extending out of the lower concrete-filled steel tube column 1, and connecting the upper concrete-filled steel tube column through a threaded fastener 23 to realize the connection between the upper and lower concrete-filled steel tube columns. The lower ring hoop 212 is reserved with a longitudinal steel bar 33 opening at the lower part of the beam, which is compatible with the reserved steel bar opening of the steel tube concrete column 1 . The special-shaped H-shaped steel 22 includes an upper flange 221 , a web 222 and a lower flange 223 , and the ends on one side of the upper flange 221 and the lower flange 223 are both inverted tapered to form a transitional effect and prevent stress concentration.

The double-steel-plate concrete beam 3 has built-in grooves matching the special-shaped H-shaped steel 22 and double steel plates 31 , and is fixedly connected with the special-shaped H-shaped steel 22 through threaded fasteners 23 . A groove is reserved in the horizontal direction at the end of the beam to facilitate concrete pouring, and a groove is reserved in the vertical direction at the end of the beam to dock with the special-shaped H-shaped steel web 222, which can be supported by placing it on the lower flange 223 of the special-shaped H-shaped steel. The double steel plate 31 pre-embedded in the double steel plate concrete beam 3 is located on both sides of the vertical groove at the end of the beam, and protrudes out of the concrete at the end of the beam for a certain distance, and is docked with the H-shaped hoop 21 to form a closed structure. The double steel plate 31 is connected with the longitudinal steel bar 32 at the upper part of the beam and the longitudinal steel bar 33 at the lower part of the beam through welding. The fastener 23 strengthens the connection, see Fig. 3 and Fig. 5 .

The concrete-filled steel tube column 1 , the connector 2 and the double-steel-plate concrete beam 3 are all provided with mounting holes matched with the threaded fasteners 23 , and then the overall structure is formed by pouring concrete.

The construction of the novel prefabricated steel pipe concrete beam-column joint of the present invention includes two parts: the component manufacturing process A of the prefabricated part of the beam-column joint and the operation process B of the beam-column joint assembly process.

Follow the steps below to manufacture and process new beam-column joint prefabricated components:

Step A1, making special-shaped H-shaped steel: According to the requirements of the design drawing, the upper and lower flanges of the special-shaped H-shaped steel are both inverted tapered to form a transitional effect and prevent stress concentration. Bolt holes are opened at the corresponding positions of the special-shaped H-shaped steel web to make Become special-shaped H-shaped steel, as shown in Figure 2;

Step A2, making H-shaped hoops: After making the upper and lower hoops according to the requirements of the design drawing, place the vertical steel plate in the middle of the upper and lower hoops, and form an H shape with the upper and lower hoops by welding shaped hoops. Both the vertical steel plate and the upper hoop have bolt holes at the corresponding positions, and the upper and lower hoops respectively reserve openings for the upper longitudinal reinforcement and the lower longitudinal reinforcement of the beam according to the design requirements, as shown in Figure 2;

Step A3, making connectors: According to the requirements of the design drawing, the special-shaped H-shaped steel and H-shaped hoops are connected one by one according to the design position, and connected into a whole by welding to make the overall structure of the connectors, as shown in Figure 2;

Step A4, making double steel plate concrete beams: According to the requirements of the design drawing, pour concrete in the prepared mold, reserve the horizontal groove at the end of the beam and the vertical groove at the end of the beam, and the vertical groove at the end of the beam Pre-buried double steel plates connected to H-shaped hoops on both sides. The pre-embedded beam upper longitudinal reinforcement and beam lower longitudinal reinforcement are welded together with the double steel plates according to the design requirements, and the double steel plates and H-shaped steel webs are installed with bolts at the corresponding positions hole. After pouring, fully vibrate and move to the concrete curing area for curing until the curing requirements are met. After the curing is completed, the mold is demoulded to make a prefabricated double steel plate concrete beam, as shown in Figure 3;

Step A5, making concrete-filled steel pipe columns: According to the requirements of the design drawing, open bolt holes at the positions corresponding to the steel pipes and connectors one by one, and reserve corresponding holes for the upper longitudinal reinforcement and the lower longitudinal reinforcement of the beam. After reserving the upper longitudinal reinforcement of the beam and the opening of the lower longitudinal reinforcement in the cross-stiffened steel plate, the cross-stiffened steel plate is welded in the steel tube concrete column, and the height is the same as that of the special-shaped H-shaped steel web. Concrete is poured in the steel pipe to the design elevation, and the poured concrete-filled steel pipe column is fully vibrated and then moved to the concrete curing area for maintenance until the maintenance requirements are met, and the prefabricated steel pipe concrete column is made, as shown in Figure 4;

Follow the steps below to carry out the assembly process of the new beam-column joint:

Step B1, assembling connectors: use a crane to place the concrete-filled steel tube columns made in step A5 vertically, put the connectors through the concrete-filled steel tube columns at the corresponding positions, and then pass one side of the screw through the concrete-filled steel tube columns and the connecting rods The bolt holes reserved for parts are reinforced with nuts, and the connection method is shown in Figure 4;

Step B2, assembling the double-steel-steel concrete beam: use a crane to splice the double-steel-steel concrete beam made in step A4 with the corresponding position of the connector. The double-slab concrete beam is placed on the lower flange of the special-shaped H-shaped steel of the connector. The H-shaped hoops of the connectors are butted to form a closed space. The upper and lower longitudinal steel bars of the beam extend into the corresponding reserved holes respectively, and the special-shaped H-shaped steel webs extend into the vertically reserved groove at the end of the beam. Bolts are used to reinforce and connect the double-steel plate concrete beams to the connectors at the reserved bolt holes, and the connection method is shown in Figure 5;

Step B3, pouring concrete: After the double-steel-plate concrete beams are connected, concrete is poured at the beam-column nodes and at the grooves of the double-steel-concrete beams.

To sum up, the new prefabricated CFST beam-column joints, CFST columns, connectors, and double-steel-steel concrete beams are all prefabricated structures, and become a whole after on-site pouring, forming four materials: steel pipes, steel bars, steel plates, and concrete. The combined structure can give full play to the excellent seismic performance of steel and concrete, and further improve the bearing capacity, structural integrity and seismic performance of beam-column joints. The process is easier.

The invention combines the dry connection method with the wet connection method, and adopts threaded fasteners to connect the steel pipe concrete columns, connectors and double-steel concrete beams, and the grooves at the beam-column nodes and the end grooves of the double-steel concrete beams are made of concrete The pouring forms a whole. Compared with the traditional beam-column joint, the connection performance and seismic performance of the beam-column joint are greatly improved. The construction is convenient, the structural strength is high, and the seismic performance is good.

Supplementary Note: The above are only preferred examples of the present invention, and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions of the foregoing examples. Or equivalent replacement of some of the technical features. Any modifications, equivalent replacements, improvements, additions, changes in details, etc. made within the principles of the present invention are included within the scope of protection of the present invention.

Claims (10)

1. A novel prefabricated concrete-filled steel tube beam-column node, comprising a concrete-filled steel tube column, a connector and a double-steel-concrete beam, characterized in that: the steel-steel concrete column and the double-steel-concrete beam are connected by the connector, and then passed through the Concrete is poured between the steel pipe concrete column and the double steel plate concrete beam node connected by the connecting piece; the connecting piece includes H-shaped hoop, special-shaped H-shaped steel and threaded fastener, and the H-shaped hoop is tightened by thread Fixtures are fixed at the joints of the concrete-filled steel tube column-beam-column, and the special-shaped H-shaped steel is fixedly connected with the adapted H-shaped hoop by welding; grooves and steel plates, and the double-steel plate concrete beams are fixedly connected with special-shaped H-shaped steels through threaded fasteners. 2. The novel prefabricated concrete-filled steel tube beam-column joint according to claim 1, characterized in that openings for the upper longitudinal reinforcement and the lower longitudinal reinforcement of the beam are reserved at the joint for the concrete-filled steel pipe beam-column. 3. The new fabricated steel pipe concrete beam-column node according to claim 1, characterized in that: the H-shaped hoop includes an upper hoop, a lower hoop and a vertical steel plate, and the vertical steel plate is located on the upper and lower The middle part of the lower hoop is welded with the upper hoop and the lower hoop to form an H shape to strengthen the connection stiffness of the upper and lower ends of the beam-column joint. 4. The novel prefabricated CFST beam-column node according to claim 3, characterized in that: the upper hoop protrudes from the lower CFST column, and connects the upper CFST column through threaded fasteners to realize the upper and lower joints. Connection of concrete-filled steel tube columns. 5. The new fabricated steel pipe concrete beam-column joint according to claim 3, characterized in that: the upper ring hoop is reserved with openings for the longitudinal steel bars at the upper part of the beam, and the lower ring hoop is reserved with longitudinal steel bars at the lower part of the beam The opening is adapted to the reserved opening of the steel pipe concrete column. 6. The new fabricated steel pipe concrete beam-column joint according to claim 1, characterized in that: the special-shaped H-shaped steel includes an upper flange, a web and a lower flange, and one side of the upper flange and lower flange The ends are all inverted tapered to form a transitional effect and prevent stress concentration. 7. The new fabricated steel pipe concrete beam-column joint according to claim 1, characterized in that: grooves are reserved in the horizontal direction at the ends of the double-steel concrete beams to facilitate concrete pouring, and the ends of the double-steel concrete beams are vertical A groove is reserved in the vertical direction to connect with the special-shaped H-shaped steel web, and the double steel plate concrete beam can be supported by placing it on the lower flange of the special-shaped H-shaped steel. 8. The new prefabricated concrete filled steel pipe beam-column joint according to claim 1, characterized in that: the double steel plates pre-embedded in the double steel plate concrete beam are located on both sides of the vertical groove at the end of the beam, and protrude out of the concrete at the end of the beam For a certain distance, it is docked with the H-shaped hoop to form a closed structure. 9. The new fabricated steel pipe concrete beam-column joint according to claim 8, characterized in that: the double steel plates are connected with the upper longitudinal reinforcement and the lower longitudinal reinforcement of the beam through welding, and the upper longitudinal reinforcement and the lower longitudinal reinforcement of the beam are connected to each other. After the steel bar passes through the reserved opening, the double steel plates are connected to the special-shaped H-shaped web through threaded fasteners. 10. The new fabricated steel pipe concrete beam-column joint according to claim 1, characterized in that: the beam-column joint is provided with a cross-stiffened steel plate, and the height of the cross-stiffened steel plate is the same as the height of the special-shaped H-shaped steel web , the cross-stiffened steel plate is reserved with openings for the upper longitudinal reinforcement of the beam and the lower longitudinal reinforcement, which are compatible with the reserved openings of the steel pipe concrete column and the reserved openings of the H-shaped hoop.

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