Reinforced concrete prefabricated beam-column joint toughness connecting device

Abstract

The utility model discloses a reinforced concrete prefabricated beam column joint toughness connecting device which comprises a torsion tube energy dissipation assembly and a protective cover, the torsion tube energy dissipation assembly comprises a torsion tube inner barrel, a pair of torsion tube outer barrels and a pair of torsion tube end plates, and the middle of the torsion tube inner barrel is fixed to a first bottom plate through a first connecting part; the two ends of the torsion tube are coaxially sleeved with a pair of torsion tube outer cylinders, the near ends of the pair of torsion tube outer cylinders are fixed to the pair of second bottom plates through a pair of second connecting parts respectively, and the far ends of the pair of torsion tube outer cylinders are connected with the torsion tube inner cylinder through a pair of torsion tube end plates respectively; and the first connecting part and the pair of second connecting parts are connected through a plurality of shear pins. According to the device, the plastic hinge can be transferred from the column end to the beam end, a'strong column and weak beam 'failure mode is achieved, when the beam-column joint rotates and deforms, a graded energy consumption mechanism that the shear pins are damaged before and the torsion pipe energy consumption assembly deforms and consumes energy after deformation can be achieved, the device is convenient and fast to machine and efficient in construction, the structure function can be rapidly recovered after a disaster, and the building toughness is improved.

Description

Technical Field

[0001] The invention relates to a reinforced concrete prefabricated beam-column node toughness connection device, belonging to the technical field of building structures. Background Art

[0002] As one of the common forms of building structures, reinforced concrete frame structures are widely used due to their flexible planar layout. However, their horizontal lateral stiffness is relatively small. Under the action of seismic loads, plastic hinges may be formed at the ends of weak layer columns, resulting in an unfavorable yield mechanism of "strong beams and weak columns" in the structure. In severe cases, the structure may collapse as a whole, posing a serious threat to personnel safety, owner's property and building functions. Presetting plastic hinges at the locations with large bending moments at the ends of the beams of the structure to guide the structure into the "strong column and weak beam" yield mechanism when subjected to extreme loads such as earthquakes or impacts is a technical means to overcome the above problems.

[0003] In recent years, my country has vigorously promoted prefabricated buildings, which are a construction method that is green and environmentally friendly, efficient in construction, and highly mechanized and automated. At present, frame structures usually use factory-prefabricated beams and columns, and cast-in-place "wet" connections in the beam-column node area on site. Although relevant specifications require prefabricated building performance to be "equivalent to cast-in-place", compared with traditional concrete cast-in-place structures, prefabricated structures have relatively poor integrity and seismic performance, and damage is often concentrated in the node area, making post-earthquake repair difficult. Therefore, the development of a beam-column node toughness connection device with efficient construction, reliable performance, easy repair, and easy to quickly restore structural functions after damage has become an urgent problem to be solved. Utility Model Content

[0004] To solve the above problems, the utility model provides a beam-column node toughness connection device with high construction efficiency, reliable performance, easy repair, and convenient for rapid recovery of structural function after damage, so as to realize the connection between assembled reinforced concrete prefabricated beams and prefabricated columns.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a toughness connection device for a reinforced concrete prefabricated beam-column node, comprising a torsion tube energy dissipation component, a first base plate, a first connection part, a pair of second base plates, and a pair of second connection parts. The torsion tube energy dissipation component comprises a torsion tube inner tube, a pair of torsion tube outer tubes and a pair of torsion tube end plates. The middle part of the torsion tube inner tube is fixed to the first base plate through the first connection part, a pair of torsion tube outer tubes are coaxially sleeved at both ends of the torsion tube inner tube, the proximal ends (the ends close to the first connection part) of the pair of torsion tube outer tubes are respectively fixed to the pair of second base plates through a pair of second connection parts, and the distal ends (the ends away from the first connection part) of the pair of torsion tube outer tubes are respectively connected to the torsion tube inner tube through a pair of torsion tube end plates; the first connection part and the pair of second connection parts are connected by a plurality of shear pins.

[0007] In an implementation manner of the utility model, the first bottom plate is vertically connected to the first connecting portion, and the second bottom plate is vertically connected to the second connecting portion.

[0008] In an implementation manner of the utility model, the pair of torsion tube outer cylinders, the pair of second bottom plates and the pair of second connecting parts are symmetrical about the first connecting part, so that the torsion tube energy dissipation assembly is subjected to symmetrical force.

[0009] In an embodiment of the utility model, both end surfaces of the torsion tube inner tube and one end of the pair of torsion tube outer tubes away from the first connecting portion are respectively connected to the pair of torsion tube end plates by first fixing bolts.

[0010] In one embodiment of the utility model, a plurality of shear pin holes for inserting shear pins are arranged at corresponding positions on the first connecting part and a pair of second connecting parts to limit the rotation of the torsion tube node when the structure is in normal use, thereby avoiding cracking of surrounding structural components due to the small resistance in the initial elastic deformation stage of the torsion tube, and there are no less than two groups of shear pin holes.

[0011] In one embodiment of the utility model, an embedded connecting piece is provided on a precast reinforced concrete beam or a precast reinforced concrete column, and the embedded connecting piece includes an embedded steel plate, and a plurality of pull-out steel bars embedded in the precast reinforced concrete beam or the precast reinforced concrete column are arranged on the back of the embedded steel plate. The embedded steel plate is also provided with a plurality of reserved screw holes for inserting reserved screws, so as to facilitate the connection, maintenance and replacement of the tough connection device.

[0012] In an implementation manner of the utility model, the first bottom plate and a pair of second bottom plates are both provided with a plurality of second screw holes matching the reserved screw rods.

[0013] In one embodiment of the utility model, a protective cover is further included, which is composed of an upper cover, a lower cover, and a side cover. The upper cover and the side cover, and the lower cover and the side cover are connected by a plurality of second fixing bolts; the protective cover cooperates with the first bottom plate and a pair of second bottom plates to form protection for the torsion tube energy dissipation assembly, thereby preventing concrete or debris from getting stuck in the gap between the first bottom plate, the second bottom plate, the first connecting part and the second connecting part during later construction, thereby interfering with the rotation of the device during operation.

[0014] In one embodiment of the utility model, two reinforcing ribs are provided on the inner side of the upper cover of the protective cover, and the reinforcing ribs are located between the first connecting portion and a pair of second connecting portions to prevent the upper cover from collapsing due to the action of the upper load; a through hole is opened on the side cover of the protective cover at a position corresponding to the torsion tube energy dissipation component, for the torsion tube energy dissipation component to pass through.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] (1) The utility model adopts the torsional yield of the metal tube as an energy dissipation mechanism, which can realize the yield mechanism of "strong column and weak beam" under the action of earthquake or impact load. While realizing the transfer of plastic hinge from the column end to the beam end, the wide plastic rotation angle-torsion platform characteristics of the torsional yield mechanism of the metal tube are utilized to dissipate energy, thereby improving the earthquake resistance and disaster prevention performance of the structure and meeting the earthquake resistance fortification requirements of "not collapsing in a major earthquake".

[0017] (2) The utility model provides shear pin holes on the first and second connecting parts of the torsion tube energy dissipation assembly, and uses shear pins to limit the rotation of the torsion tube when the structure is in normal use, thereby avoiding the problem of insufficient bearing capacity of the torsion tube assembly in the initial elastic stage, which leads to deformation and cracking of related structural components.

[0018] (3) The utility model achieves the purpose of graded energy dissipation by combining the shearing destruction energy dissipation of the shear pins with the plastic torsion energy dissipation of the torsion tube assembly. The tough connection device of the utility model is assembled by separating components and mechanical connection, which can achieve rapid repair and replacement after damage, meeting the seismic fortification requirements of "repairable in moderate earthquakes". At the same time, it can significantly shorten the structural function recovery time and greatly improve the seismic and impact toughness of the building.

[0019] (4) The parts, precast reinforced concrete columns and precast reinforced concrete beams of the ductile connection device of the utility model can be sent to the construction site for "dry" assembly and connection after being prefabricated in the factory. The construction process has the advantages of low carbon and environmental protection, high construction efficiency and high automation and mechanization. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an axonometric view of the flexible connection device of the utility model.

[0021] Figure 2 It is a schematic diagram of the torsion tube energy dissipation component and the protective cover of the utility model.

[0022] Figure 3 It is an exploded view of the torsion tube energy dissipation component of the utility model.

[0023] Figure 4 It is a schematic diagram of the assembly of the flexible connection device of the utility model.

[0024] Figure 5 The present invention is a schematic diagram of a frame structure for installing the flexible connection device of the present invention.

[0025] In the figure: 1. reinforced concrete precast column; 2. reinforced concrete precast beam; 3. embedded connector; 4. ductile connector; 5. protective cover; 301. embedded steel plate; 302. reserved screw hole; 303. pull-out steel bar; 304. reserved screw rod; 401. first bottom plate; 402. second connecting part; 403. inner tube of twisted tube; 404. outer tube of twisted tube; 405. end plate of twisted tube; 406. shear pin; 407. shear pin hole; 408. second screw hole; 409. second bottom plate; 410. gasket; 411. nut; 412. first fixing bolt; 413. first connecting part; 501. upper cover; 502. lower cover; 503. side cover; 504. second fixing bolt. DETAILED DESCRIPTION

[0026] The technical solutions 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 only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected 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.

[0028] In the description of the present invention, it should be noted that the terms "upper", "inner", "inside", "both ends", "one end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] Embodiment 1;

[0030] See also Figure 1-4 ;

[0031] The present embodiment provides a reinforced concrete prefabricated beam-column node toughness connection device, comprising a torsion tube energy dissipation assembly, a first bottom plate 401, a first connection part 413, a pair of second bottom plates 409, and a pair of second connection parts 402. The torsion tube energy dissipation assembly comprises a torsion tube inner tube 403, a pair of torsion tube outer tubes 404, and a pair of torsion tube end plates 405. The middle part of the torsion tube inner tube 403 is fixed to the first bottom plate 401 through the first connection part 413. A pair of torsion tube outer tubes 404 are coaxially sleeved at both ends of the torsion tube inner tube 403. The proximal ends (the ends close to the first connection part 413) of the pair of torsion tube outer tubes 404 are respectively fixed to the pair of second bottom plates 409 through a pair of second connection parts 402. The distal ends (the ends away from the first connection part 413) of the pair of torsion tube outer tubes 404 are respectively connected to the torsion tube inner tube 403 through a pair of torsion tube end plates 405. The first connection part 413 and the pair of second connection parts 402 are connected by a plurality of shear pins 406. The pair of torsion tube outer cylinders 404 and the pair of second connecting parts 402 are symmetrical about the first connecting part 413, the first bottom plate 401 is vertically connected to the first connecting part 413, the second bottom plate 409 is vertically connected to the second connecting part 402, the torsion tube outer cylinder 404 is vertically connected to the second connecting part 402, and the torsion tube inner cylinder 403 is vertically connected to the first connecting part 413, so that the torsion tube energy dissipation assembly is symmetrically stressed during operation. More specifically, the first bottom plate 401, the first connecting part 413, the second bottom plate 409, and the second connecting part 402 are all made of steel plates, and the torsion tube inner cylinder 403 and the torsion tube outer cylinder 404 are made of soft steel material with low yield strength, and the length, diameter and wall thickness of the two can be adjusted according to the stress characteristics of the structural components at the installation location.

[0032] The two end surfaces of the torque tube inner tube 403 are provided with a plurality of first screw holes, the far end (the end away from the first connecting portion 413) of the torque tube outer tube 404 is provided with a plurality of first screw holes, and the pair of torque tube end plates 405 are provided with screw holes matching the plurality of first screw holes. The first fixing bolts 412 are respectively inserted into the plurality of screw holes on the pair of torque tube end plates 405 and into the first screw holes on the torque tube inner tube 403 and the torque tube outer tube 404, so as to realize the mechanical connection between the torque tube inner tube 403 and the torque tube outer tube 404.

[0033] A plurality of shear pin holes 407 are provided at corresponding positions on the first connection part 413 and a pair of second connection parts 402, and shear pins 406 are transversely inserted (the shear pins 406 are parallel to the outer tube 404 of the torsion tube) into the shear pin holes 407 passing through the first connection part 413 and the other second connection part 402, so as to limit the rotation of the torsion tube in the normal use state of the beam-column joint and prevent the torsion tube from deforming in the elastic stage, which may cause cracking of the surrounding structural members. There are at least two groups of shear pin holes 407 and shear pins 406 respectively.

[0034] An embedded connector 3 is provided on the reinforced concrete precast beam 2 or the reinforced concrete precast column 1, and the embedded connector 3 includes an embedded steel plate 301. A plurality of pull-out steel bars 303 embedded in the reinforced concrete precast beam 2 or the reinforced concrete precast column 1 are arranged on the back of the embedded steel plate 301. A plurality of reserved screw holes 302 are also provided on the embedded steel plate 301. One end of a plurality of reserved screw rods 304 is inserted into the reinforced concrete precast beam 2 or the reinforced concrete precast column 1 through the reserved screw holes 302, and the other end is exposed outside the embedded steel plate 301; a plurality of second screw holes 408 matching the reserved screw rods 304 are provided on the first bottom plate 401 and a pair of second bottom plates 409, so as to facilitate the installation, maintenance and replacement of the tough connection device 4. When installing the first base plate 401 (or a pair of second base plates 409), align the second screw hole 408 with the reserved screw 304, install the gasket 410 on the reserved screw 304, and install the nut 411 to tighten the reserved screw 304. The gasket 410 plays a role in tightening and preventing loosening, which can avoid stress concentration and crushing of the connection part. During factory prefabrication, when setting up the steel cage of the reinforced concrete prefabricated beam 2 or the reinforced concrete prefabricated column 1, the pre-welded tensile steel bars 303 on the embedded connector 3 are tied and fixed to the steel cage, and the reserved screw 304 is screwed into the reserved screw hole 302, and the other end is exposed outside the embedded steel plate 301, and the reserved screw 304 is well protected by the thread, and then concrete is poured to obtain the prefabricated reinforced concrete prefabricated beam 2 or the reinforced concrete prefabricated column 1. When installing the tough connection device 4, the reserved screw 304 can be screwed out of the reserved screw hole 302.

[0035] The utility model adopts a combination of shearing pin shearing damage energy dissipation and torsion tube assembly plastic torsion energy dissipation to achieve node rotation graded energy dissipation. Specifically, when the building structure is in normal use or a small earthquake, the shear pin 406 in the tough connection device 4 mainly plays a role in limiting the node rotation to avoid damage and cracking of related peripheral structural components. When the earthquake load on the building structure reaches the level of medium earthquake or above, the shear pin 406 is sheared and dissipates a part of the energy. At the same time, the node rotates, and the remaining energy is borne by the plastic deformation of the torsion tube energy dissipation assembly. At this time, the building structure will enter the yield failure mode of "strong column and weak beam", realize the transfer of plastic hinge from the column end to the beam end, and use the wide plastic rotation angle ~ torsion platform of the torsion tube energy dissipation assembly to dissipate energy, thereby improving the seismic energy dissipation performance of the building structure and meeting the seismic fortification requirements of "small earthquake is not damaged, medium earthquake can be repaired, and large earthquake does not collapse"; when the torsion tube energy dissipation assembly yields and deforms after the earthquake, the function of the building structure can be quickly restored by replacing the tough connection device 4. All components of the tough connection device 4 of the utility model are prefabricated in a factory and assembled on site, so the construction is efficient, the degree of automation and mechanization is high, and the maintainability is good.

[0036] The flexible connection device of the utility model is installed according to the following method:

[0037] 1) All accessories of the tough connection device 4 are processed according to the design requirements, a pair of twist tube outer tubes 404 are respectively sleeved on the two ends of the twist tube inner tube 403, and the two ends of the twist tube inner tube 403 are respectively connected to the twist tube outer tube 404 by twist tube end plates 405, and the first fixing bolt 412 is tightened, and the shear pin 406 is inserted into the shear pin hole 407 of one of the second connecting parts 402, and after passing through the shear pin hole 407 of the first connecting part 413, it is fixed in the shear pin hole 407 of the other second connecting part 402;

[0038] 2) Move the assembled tough connection device 4 to the corresponding node position of the reinforced concrete precast beam 2 and the reinforced concrete precast column 1, first remove the reserved screw 304, let the positions of the first bottom plate 401 and the second bottom plate 409 match the embedded steel plates 301 on the reinforced concrete precast beam 2 and the reinforced concrete precast column 1 respectively, align the second screw hole 408 with the reserved screw hole 302, then screw in the reserved screw 304, finally install the gasket 410, tighten the nut 411 to complete the tightening, and realize the connection between the reinforced concrete precast beam 2 and the reinforced concrete precast column 1.

[0039] The disassembly process is the reverse of the installation process.

[0040] Embodiment 2;

[0041] See also Figure 1-5 ;

[0042] The utility model of the reinforced concrete prefabricated beam-column node toughness connection device based on torsion tube energy dissipation also includes a protective cover 5, which is composed of an upper cover 501, a lower cover 502, and a side cover 503. The upper cover 501 and the side cover 503, and the lower cover 502 and the side cover 503 are connected by a plurality of second fixing bolts 504; the protective cover 5 cooperates with the first bottom plate 401 and a pair of second bottom plates 409 to form protection for the torsion tube energy dissipation component. Two reinforcing ribs are arranged on the inner side of the upper cover 501 of the protective cover 5, and the two reinforcing ribs are respectively located between the first connecting portion 413 and the pair of second connecting portions 402, and are preferably tangent to the uppermost shear pin 406; because the lengths of the torsion tube inner tube 403 and the torsion tube outer tube 404 in the torsion tube energy dissipation component need to be adjusted, sometimes the length of the torsion tube inner tube 403 exceeds the range of the protective cover 5, so a through hole is opened on the side cover 503 of the protective cover 5 at a position corresponding to the torsion tube energy dissipation component for the torsion tube energy dissipation component to pass through. However, when the length of the twisted tube inner tube 403 and the twisted tube outer tube 404 does not exceed the range of the protective cover 5, the through hole may not be provided on the side cover 503. In the present utility model, the purpose of installing the protective cover 5 is to facilitate subsequent construction. After the installation of the device, the upper part thereof needs to be cast or laid with a floor slab or a floor decoration layer, and the irregular part needs to be adjusted to a plane. The provision of reinforcing ribs can prevent the upper cover plate from being deformed due to load bearing, which may cause the floor to crack or collapse.

[0043] An upper cover 501, a lower cover 502 and two side covers 503 are arranged in four directions of the tough connection device 4 installed in Example 1. At the same time, the through holes on the side cover 503 are aligned with the torsion tube energy dissipation assembly. The upper cover 501 and the side cover 503, and the lower cover 502 and the side cover 503 are connected by the second fixing bolts 504, so that the formed protective cover 5 is consistent with the outer dimensions of the reinforced concrete precast beam 2. The protective cover 5 not only protects the tough connection device 4 from the influence of subsequent construction and pouring, and avoids the energy dissipation capacity of the tough connection device 4 from being weakened due to other factors, but also plays an aesthetic role.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A reinforced concrete prefabricated beam-column node toughness connection device, characterized in that: The invention comprises a torsion tube energy dissipation assembly, a first bottom plate (401), a first connecting portion (413), a pair of second bottom plates (409), and a pair of second connecting portions (402). The torsion tube energy dissipation assembly comprises a torsion tube inner tube (403), a pair of torsion tube outer tubes (404), and a pair of torsion tube end plates (405). The middle portion of the torsion tube inner tube (403) is fixed to the first bottom plate (401) through the first connecting portion (413). The two ends of the torsion tube inner tube (403) are coaxially sleeved with a pair of torsion tube outer tubes. (404), one end of the pair of twist tube outer tubes (404) close to the first connection part (413) is fixed to a pair of second bottom plates (409) respectively through a pair of second connection parts (402), and one end of the pair of twist tube outer tubes (404) away from the first connection part (413) is connected to the twist tube inner tube (403) respectively through a pair of twist tube end plates (405); the first connection part (413) and the pair of second connection parts (402) are connected by a plurality of shear pins (406).

2. The device according to claim 1, characterized in that: The pair of twisted tube outer cylinders (404), the pair of second bottom plates (409) and the pair of second connecting portions (402) are all symmetrical about the first connecting portion (413).

3. The device according to claim 1 or 2, characterized in that: The first bottom plate (401) is vertically connected to the first connecting portion (413), and the second bottom plate (409) is vertically connected to the second connecting portion (402).

4. The device according to claim 1, characterized in that: Both end surfaces of the twist tube inner tube (403) and one end of the pair of twist tube outer tubes (404) away from the first connection portion (413) are respectively connected to the pair of twist tube end plates (405) by using first fixing bolts (412).

5. The device according to claim 1, characterized in that: A plurality of shear pin holes (407) for inserting shear pins (406) are provided at corresponding positions on the first connecting portion (413) and the pair of second connecting portions (402), and the number of shear pin holes (407) is no less than two groups.

6. The device according to claim 1, characterized in that: A pre-embedded connection piece (3) is provided on a reinforced concrete precast beam (2) or a reinforced concrete precast column (1), wherein the pre-embedded connection piece (3) comprises a pre-embedded steel plate (301), a plurality of pull-out steel bars (303) embedded in the reinforced concrete precast beam (2) or the reinforced concrete precast column (1) are provided on the back of the pre-embedded steel plate (301), and a plurality of reserved screw holes (302) for inserting reserved screw rods (304) are also provided on the pre-embedded steel plate (301).

7. The device according to claim 6, characterized in that: The first bottom plate (401) and the pair of second bottom plates (409) are both provided with a plurality of second screw holes (408) matching the reserved screw rods (304).

8. The device according to any one of claims 1 to 7, characterized in that: The protective cover (5) is also included. The protective cover (5) is composed of an upper cover (501), a lower cover (502), and a side cover (503). The upper cover (501) and the side cover (503), and the lower cover (502) and the side cover (503) are connected by a plurality of second fixing bolts (504).

9. The device according to claim 8, characterized in that: Two reinforcing ribs are provided on the inner side of the upper cover (501) of the protective cover (5), and the two reinforcing ribs are respectively located between the first connecting portion (413) and the pair of second connecting portions (402).

10. The device according to claim 8 or 9, characterized in that: A through hole is provided on the side cover (503) of the protection cover (5) at a position corresponding to the torsion tube energy dissipation component.

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