A new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed

Abstract

The present invention discloses a new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed, including a precast concrete beam, an outer steel corbel, high-strength bolts in the node area, a friction energy dissipation device, and a steel tube; high-strength concrete is injected into the steel tube to form high-strength thin-walled square steel tube concrete; the high-strength steel and high-strength concrete used in the high-strength thin-walled square steel tube concrete can overcome the problem of excessive cross-section caused by insufficient strength of traditional materials, and the high-strength steel has a large restraining effect on the core concrete, which can give full play to the bearing capacity of high-strength materials, and is conducive to reducing the use of building materials and the high cost of construction. The steel tube core area is opened with a hole, which can realize the one-time casting of the concrete in the column and the cast-in-place concrete as a whole, which is conducive to improving the overall performance of the structure. A friction energy dissipation device is provided at the bottom of the precast concrete beam, which is conducive to increasing the seismic performance of the frame.

Description

Technical Field

[0001] The invention belongs to the technical field of structural engineering, and in particular belongs to a novel friction energy dissipation node of a steel tube concrete column-precast concrete beam which can be installed quickly. Background Art

[0002] Prefabricated buildings refer to the components or accessories used in buildings that are made in advance in a processing plant and then transported to the site for assembly and installation through reliable connection methods. Prefabricated buildings have the advantages of short maintenance cycle, convenient and rapid construction, energy saving and environmental protection. Prefabricated nodes are crucial to the overall performance and seismic performance of the entire building. Unreasonable node design may cause serious damage or even collapse of the building under the action of an earthquake. Common prefabricated buildings mainly include prefabricated concrete structures, steel structures and modern wooden structures. Traditional prefabricated concrete structures often use sleeve slurry connections or mechanical connections, which require high construction accuracy and are difficult to ensure construction quality; in common prefabricated structures, problems such as large steel consumption, high cost, fire prevention and rust prevention are difficult to solve; modern wooden structures have problems such as material corrosion and insufficient bearing capacity, which are difficult to apply to high-rise buildings. Compared with the above common assembly forms, the promotion and application of high-strength steel tube concrete column-prefabricated concrete beam self-resetting friction energy dissipation connection node connection frame that can be quickly installed in prefabricated buildings can significantly improve the construction efficiency and industrialization level of buildings, which fully meets the needs of my country's construction industrialization development.

[0003] At present, in common civil and industrial buildings, steel tube concrete columns and concrete beams are usually connected by cast-in-place. This type of node often has the following problems:

[0004] (1) With the needs of modernization construction, the requirements for structural safety and seismic redundancy are increasing. Traditional materials have low strength and limited bearing capacity. Usually, the cross-section of components is increased, which is not conducive to the effective use of building space and easily generates a large amount of construction waste that is difficult to handle.

[0005] (2) The traditional node form is a fully cast-in-place node. This wet connection has densely packed steel bars in the node area, a long curing period, and it is difficult to control the bonding effect between the post-cast concrete and the precast concrete. This is not conducive to the modular rapid construction of prefabricated buildings and the seismic performance of the overall structure.

[0006] In summary, the traditional steel tube concrete column-concrete beam adopts a fully wet connection scheme, which has high requirements on construction quality, long maintenance period, and difficulty in improving construction efficiency. In addition, this structural form of the frame is difficult to ensure the overall performance and seismic performance of the structure. Summary of the invention

[0007] In order to solve the problems existing in the prior art, the present invention provides a new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed. This new node can significantly improve the construction efficiency, cross-sectional bearing capacity, energy dissipation capacity and self-reset capacity of prefabricated buildings. The present invention can effectively improve the problems of "thick beam and fat column" caused by insufficient material strength, excessive residual deformation, low construction efficiency, poor overall performance and seismic performance of traditional cast-in-place or fully prefabricated steel tube concrete-concrete beam nodes.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed, including a precast concrete beam, an outer steel bracket, high-strength bolts in the node area, a friction energy dissipation device, and a steel tube;

[0010] High-strength concrete is injected into the steel tube to form high-strength thin-walled square steel tube concrete; an outer steel bracket is arranged on the side wall of the steel tube, and a friction energy dissipation device is arranged at the bottom front end of the precast concrete beam, and the friction energy dissipation device is placed on the bottom plate of the outer steel bracket; the friction energy dissipation device includes an open end plate at the front of the energy dissipation zone, an upper end plate of the energy dissipation zone, an open end plate of the energy dissipation zone, a bottom end plate of the energy dissipation zone and a side plate of the energy dissipation zone;

[0011] The interior and top of the precast concrete beam are provided with a steel skeleton, the front end of the steel skeleton at the bottom of the precast concrete beam is connected to a connecting end plate, and the connecting end plate is connected to the open end plate of the energy dissipation area through a force transmission plate;

[0012] The energy consumption area front opening end plate, the energy consumption area upper end plate, the energy consumption area opening end plate, the energy consumption area bottom end plate and the energy consumption area side plate form a rectangular structure;

[0013] The high-strength bolts in the node area are fixed by sequentially passing through the steel pipe, high-strength concrete, the front opening end plate of the energy dissipation area and the opening end plate of the energy dissipation area;

[0014] The steel reinforcement skeleton at the top of the precast concrete beam passes through the cold-bent high-strength thin-walled steel pipe, and forms the overlapping part of the floor slab after pouring concrete.

[0015] Preferably, the strength grade of the steel pipe is not lower than Q420.

[0016] Preferably, the strength grade of the high-strength concrete is not lower than C60.

[0017] Preferably, stiffening ribs are provided below the bottom plate of the outer steel corbel.

[0018] Preferably, the steel frame and the connecting end plates are connected by welding.

[0019] Preferably, the outer steel corbel is a U-shaped corbel.

[0020] Preferably, a brass plate is provided at the bottom of the outer steel-clad corbel, and a high-strength bolt passes through the brass plate and is fixed to the bottom of the outer steel-clad corbel.

[0021] Preferably, the front end plate with holes in the energy dissipation zone, the upper end plate in the energy dissipation zone, the end plate with holes in the energy dissipation zone, the bottom end plate in the energy dissipation zone and the side plates in the energy dissipation zone are fixedly connected by welding.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] The present invention provides a novel friction energy dissipation node of a steel tube concrete column-precast concrete beam that can be quickly installed. The partially assembled installation can improve the construction efficiency. The overlapping effect of the corbel can improve the utilization efficiency of the machinery. The connection form of the friction energy dissipation node can ensure the seismic performance of the node or frame structure.

[0024] The high-strength steel and high-strength concrete used in the high-strength thin-walled square steel tube concrete of the present invention can overcome the problem of excessive cross-section caused by insufficient strength of traditional materials, and the high-strength steel has a large restraining effect on the core concrete, which can give full play to the bearing capacity of high-strength materials, and is conducive to reducing the use of building materials and the high cost of construction. This kind of node has an external steel bracket, which can realize convenient construction after rapid lifting, improve the construction efficiency of on-site machinery, and open a hole in the steel pipe in the core area of ​​the node, which can realize the one-time casting of the concrete in the column and the cast-in-place concrete as a whole, which is conducive to improving the overall performance of the structure. A friction energy dissipation device is provided at the bottom of the precast concrete beam, which is conducive to increasing the seismic performance of the frame.

[0025] The new friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed provided by the present invention meets the assembly rate requirements of today's prefabricated structure construction, and can effectively overcome the problems of large cross-sectional design, low bearing capacity, low construction efficiency, long maintenance period and poor seismic performance of traditional cast-in-place or fully prefabricated steel tube concrete column-concrete beam. The use of new cross-sectional forms and node construction schemes can effectively improve the construction efficiency and structural performance of the new hybrid structure of steel tube concrete column-precast concrete beam, and has good economic benefits and technical advantages in modern civil buildings, industrial buildings, special buildings and other multi-story important buildings.

[0026] In prefabricated buildings, the structural form of the node has a significant impact on the force mechanism and overall performance between beams and columns. The present invention provides a partially assembled high-strength steel tube concrete column-precast concrete beam self-resetting friction energy dissipation node that can be quickly installed, which can meet the overall performance and seismic performance between beams and columns when the beam-column components are quickly hoisted; the new connection node adopts a high-strength thin-walled square steel tube concrete column. The application of high-strength materials can significantly enhance the restraint effect and anti-buckling ability of the steel tube, and the high-strength concrete poured inside significantly improves the bearing capacity of the cross section. High-strength bolts are provided at the node, passing through the steel plate at the core area of ​​the node and the bottom of the precast concrete beam, so that the beam is overlapped on the bolts. By tightening the bolts, the node and the precast concrete beam are firmly connected, and the rapid overlap and installation of the overall frame are realized; a wet connection scheme is adopted at the upper part of the node, and the upper longitudinal reinforcement is passed through the core area of ​​the node, and concrete is poured on site. After a short period of maintenance, construction can continue, which is conducive to enhancing the overall performance of the structure. The precast concrete beams and the superimposed part of the cast-in-place floor slabs on the top of the beams adopted by the present invention are suitable for the installation of precast concrete floor slabs and meet the requirements of today's prefabricated structure construction for the assembly rate.

[0027] Furthermore, the steel bar skeleton is connected to the connection end plate by welding. The bottom steel bars of the precast concrete beam are firmly welded to the connection end plate to ensure that the load of the bottom steel bars can be transferred to the connection end plate.

[0028] Furthermore, by providing a brass sheet at the bottom of the corbel and connecting it with high-strength bolts, the friction energy dissipation between the corbel bottom plate and the brass sheet is achieved through the tensile deformation of the lower prefabricated beam. This solution can effectively improve the energy dissipation capacity of the overall structure under earthquake action.

[0029] Furthermore, a U-shaped corbel is provided at the connection position between the steel tube concrete column and the precast concrete beam, so that the beam is placed on the corbel during the hoisting process, thereby realizing the rapid hoisting of the beam and column, and the corbel can replace part of the cast-in-place concrete formwork, thereby improving the overall construction speed of the prefabricated building. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed;

[0031] Figure 2 It is a schematic diagram of the connection structure of precast concrete beams and high-strength bolts;

[0032] Figure 3 It is a schematic diagram of the structure of the energy dissipation device and the corbel;

[0033] In the attached drawings: the overlapping part of the floor slab 1; the precast concrete beam 2; the outer steel corbel 3; the brass plate 4; the high-strength bolts 5; the end plate with holes 6; the side plate of the energy dissipation area 7; the connecting end plate 8; the stiffening ribs 9; the steel pipe 10; the high-strength concrete 11; the force transfer plate 12; the high-strength bolts 13; the steel skeleton 14; the upper end plate of the energy dissipation area 15; the bottom end plate of the energy dissipation area 17. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0035] Example

[0036] like Figures 1 to 3 As shown, the new friction energy dissipation node of steel tube concrete column-precast concrete beam of the present invention, which can be quickly installed, is composed of a high-strength thin-walled square steel tube concrete column, a precast concrete beam 2, an external steel bracket 3 and a friction energy dissipation device. The high-strength thin-walled square steel tube concrete is composed of a steel tube 10 and a core high-strength concrete 11 poured inside; the precast concrete beam 2 is prefabricated in batches in the factory and shares the upper steel skeleton 14 that passes through the core area of ​​the node with the superimposed part 1 of the cast-in-place floor slab; the external steel bracket 3 is firmly welded to the steel tube 10 in the factory and reinforced with stiffening ribs 9, and the external steel bracket 3 can also be used as a template for post-cast concrete and a lap platform for precast concrete beams, which is conducive to speeding up the subsequent construction speed.

[0037] The steel tube 10 of the high-strength square steel tube concrete column is characterized in that the strength grade is not less than Q420, and the core high-strength concrete 11 is characterized in that the strength grade is not less than C60.

[0038] The uppermost longitudinal reinforcement in the steel skeleton 14 passes through the steel pipe 10 and the core high-strength concrete 11, and the bottom longitudinal reinforcement is firmly welded to the connecting end plate 8, so that the load of the precast concrete beam 2 can be effectively transferred to the connecting end plate 8 and then to the entire component.

[0039] A portion of the steel skeleton 14 is reserved on the upper part of the precast concrete beam 2 to pass through the steel tube concrete column, and a cast-in-place floor slab overlap part 1 is formed by a later cast-in-place method, which can jointly bear the upper load of the beam end after pouring.

[0040] The friction energy dissipation device comprises a bottom plate of an outer steel bracket 3, high-strength bolts 13 in the energy dissipation zone, a bottom end plate in the energy dissipation zone and a brass plate 4. The brass plate 4 and the bottom plate of the outer steel bracket 3 dissipate energy by friction through the tensile deformation of the bottom high-strength bolts 5.

[0041] The energy dissipation area connecting parts include a front open hole end plate 6 of the energy dissipation area, a side plate 7 of the energy dissipation area, a connecting end plate 8, a force transmission plate 12, an upper end plate 15 of the energy dissipation area, an open hole end plate of the energy dissipation area and a bottom end plate 17 of the energy dissipation area. The connection of multiple steel components is prefabricated in advance with the precast concrete beam in the processing plant and is firmly connected by local welding, which can ensure the transfer of load and the connection of high-strength bolts 5.

[0042] The high-strength bolts 5 in the node area pass through the steel pipe 10, the core high-strength concrete 11, the front opening end plate 6 of the energy dissipation area and the opening end plate of the energy dissipation area, and are tightened and fixed with nuts.

[0043] The construction sequence of the new node solution is to erect the steel pipe 10 and the outer steel corbel 3 on site, and then hoist the precast concrete beam 2 onto the outer steel corbel 3, and then carry out the hoisting of other components without affecting the efficiency of the hoisting machinery. When it is necessary to fully install, pass the high-strength bolts 5 through the steel pipe 10, the front end plate 6 of the energy dissipation zone and the end plate with holes in the energy dissipation zone, and tighten and fix them with nuts. Then pass the longitudinal reinforcement in the upper steel skeleton 14 through the steel pipe 10, pour the core high-strength concrete 11, and pour the cast-in-place floor slab overlap part 1. Finally, tighten the high-strength bolts 13 in the energy dissipation zone, and fix the outer steel corbel 3 and the brass plate 4. The invention is suitable for structures with high requirements for fast construction speed, high mechanical utilization, overall structural performance and seismic performance.

[0044] The invention discloses a novel friction energy dissipation node of a steel tube concrete column-precast concrete beam that can be quickly installed. The partially assembled installation can improve the construction efficiency. The overlapping effect of the corbel can improve the utilization efficiency of the machinery. The connection form of the friction energy dissipation node can ensure the seismic performance of the node or the frame structure.

[0045] High-strength steel and high-strength concrete used in high-strength thin-walled square steel tube concrete can overcome the problem of excessive cross-section caused by insufficient strength of traditional materials. In addition, high-strength steel has a large restraining effect on core concrete, which can give full play to the bearing capacity of high-strength materials, and is conducive to reducing the use of building materials and high construction costs. This type of node has an external steel bracket, which can realize convenient construction after rapid lifting, improve the construction efficiency of on-site machinery, and open a hole in the steel pipe in the core area of ​​the node, so that the concrete in the column and the cast-in-place concrete can be cast in one go, which is conducive to improving the overall performance of the structure. A friction energy dissipation device is provided at the bottom of the precast concrete beam, which is conducive to increasing the seismic performance of the frame.

[0046] The new friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed provided by the present invention meets the assembly rate requirements of today's prefabricated structure construction, and can effectively overcome the problems of large cross-sectional design, low bearing capacity, low construction efficiency, long maintenance period and poor seismic performance of traditional cast-in-place or fully prefabricated steel tube concrete column-concrete beam. The use of new cross-sectional forms and node construction schemes can effectively improve the construction efficiency and structural performance of the new hybrid structure of steel tube concrete column-precast concrete beam, and has good economic benefits and technical advantages in modern civil buildings, industrial buildings, special buildings and other multi-story important buildings.

[0047] The present invention provides a new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed, which can overcome the problem of too large cross-section caused by insufficient strength of traditional materials, and the high-strength steel has a large restraining effect on the core concrete, which can give full play to the bearing capacity of high-strength materials, and is conducive to reducing the use of building materials and the high construction cost. When using the new node of the present invention to build a steel tube concrete column-concrete beam frame structure, it is mainly divided into: factory prefabricated parts, on-site erection of steel pipes, hoisting of precast concrete beams, on-site overall installation, and concrete pouring.

[0048] When the factory manufactures the precast concrete beam 2, the bottom longitudinal reinforcement of the steel skeleton 14 is welded to the connecting end plate 8, and the front opening end plate 6 of the energy dissipation area, the side plate 7 of the energy dissipation area, the connecting end plate 8, the force transmission plate 12, the upper end plate 15 of the energy dissipation area, the opening end plate of the energy dissipation area, the bottom end plate 17 of the energy dissipation area and the brass plate 4 are assembled and fixed to the bottom of the precast concrete beam 2.

[0049] The cold-bent high-strength thin-walled steel pipes 10, the outer steel brackets 3, the stiffening ribs 9 and other steel components welded in the factory are transported to the site, and the erected steel pipes serve as construction templates and supports.

[0050] The prefabricated steel and concrete hybrid structural beam components are transported from the factory to the construction site for hoisting and placed on the bottom plate of the outer steel bracket 3.

[0051] The high-strength bolts 5 are passed through the steel pipe 10, the core high-strength concrete 11, the front open hole end plate 6 of the energy dissipation area and the open hole end plate of the energy dissipation area, and are tightened with nuts. Subsequently, the upper longitudinal reinforcement of the steel skeleton 14 is passed through the cold-bent high-strength thin-walled steel pipe 10. Finally, the high-strength bolts 13 in the energy dissipation area are firmly connected to the bottom plate of the outer steel corbel 3 and the brass plate 4.

[0052] After pouring the core high-strength concrete 11 and the cast-in-place floor slab overlap part 1, after completing the above steps and the concrete is cured to the specified strength, the subsequent construction process can be continued.

Claims

1. A new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed, characterized in that: It comprises a precast concrete beam (2), an outer steel bracket (3), high-strength bolts in the node area (5), a friction energy dissipation device, and a steel pipe (10); High-strength concrete (11) is injected into the steel tube (10) to form a high-strength thin-walled square steel tube concrete; an outer steel bracket (3) is provided on the side wall of the steel tube (10); a stiffening rib (9) is provided below the bottom plate of the outer steel bracket (3); a brass plate (4) is provided at the bottom of the outer steel bracket (3); and a high-strength bolt (13) passes through the brass plate (4) and is fixed to the bottom of the outer steel bracket (3); A friction energy dissipation device is provided at the front end of the bottom of the precast concrete beam (2), and the friction energy dissipation device is placed on the bottom plate of the outer steel bracket (3); the friction energy dissipation device comprises an energy dissipation area front opening end plate (6), an energy dissipation area upper end plate (15), an energy dissipation area opening end plate, an energy dissipation area bottom end plate (17) and an energy dissipation area side plate (7); The interior and top of the precast concrete beam (2) are both provided with a steel frame (14); the front end of the steel frame (14) at the bottom of the precast concrete beam (2) is connected to a connecting end plate (8); the connecting end plate (8) is connected to the open end plate of the energy dissipation zone via a force transmission plate (12); The energy consumption zone front opening end plate (6), the energy consumption zone upper end plate (15), the energy consumption zone opening end plate, the energy consumption zone bottom end plate (17) and the energy consumption zone side plate (7) form a rectangular structure; The high-strength bolts (5) in the node area are sequentially passed through the steel pipe (10), the high-strength concrete (11), the front opening end plate (6) of the energy dissipation area, and the opening end plate of the energy dissipation area for fixing; The steel reinforcement skeleton (14) at the top of the precast concrete beam (2) passes through the cold-bent high-strength thin-walled steel pipe (10), and after pouring concrete, a floor slab overlap portion (1) is formed.

2. A new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed according to claim 1, characterized in that: The strength grade of the steel pipe (10) is not lower than Q420.

3. A new type of friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed according to claim 1, characterized in that: The strength grade of the high-strength concrete (11) is not less than C60.

4. The novel friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed according to claim 1 is characterized in that: The steel reinforcement frame (14) is connected to the connecting end plate (8) by welding.

5. The novel friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed according to claim 1 is characterized in that: The outer steel bracket (3) is a U-shaped bracket.

6. The novel friction energy dissipation node of steel tube concrete column-precast concrete beam that can be quickly installed according to claim 1 is characterized in that: The energy dissipation zone front hole end plate (6), the energy dissipation zone upper end plate (15), the energy dissipation zone hole end plate, the energy dissipation zone bottom end plate (17) and the energy dissipation zone side plate (7) are fixedly connected by welding.

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