Fully assembled prestressed concrete beam-column connector

Abstract

The present invention discloses a connector for a fully assembled prestressed concrete beam-column, which is arranged between a prefabricated beam and a prefabricated column; the connector includes a column hidden corbel, a beam end steel corbel and a plurality of ductile connectors; the column hidden corbel is pre-buried in the prefabricated column, horizontally arranged in the column node area where the prefabricated column matches the prefabricated beam, and the end extends from the side of the prefabricated column; the beam end steel corbel is pre-buried in the middle position of the connecting end of each prefabricated beam connected to the prefabricated column; and one end of the beam end steel corbel extends from the connecting end of the corresponding prefabricated column and is connected to the corresponding column hidden corbel; a plurality of ductile connectors are all pre-buried in the prefabricated column, horizontally arranged at a position matching a plurality of prestressed threaded steel bars on the upper and lower sides of the prefabricated beam; and each ductile connector is connected to the corresponding prestressed threaded steel bar. The present invention can realize dry connection of prefabricated frame nodes, reduce the workload of wet operations on site, enhance node performance, and achieve energy consumption and replacement of ductile energy dissipators.

Description

Technical Field

[0001] The invention relates to the technical field of prefabricated concrete frame construction, in particular to a connector of a fully assembled prestressed concrete beam column. Background Art

[0002] Precast beams and precast columns are construction techniques that have been widely used in various construction projects.

[0003] In the existing prefabricated beam and prefabricated column construction technology, prefabricated beams and prefabricated columns are usually connected by integrally cast wet connection nodes. Since the beam-column node area is cast-in-place concrete, although the node force performance is equivalent to cast-in-place, it is impossible to achieve the rapid assembly construction of prefabricated beams and columns. Some scholars have also tried to use dry nodes for beam-column connection to connect prefabricated columns and prefabricated beams. For example, the patented technology disclosed in the publication number CN107905363A uses shear-resistant steel plates to connect and transmit shear forces, which is less stress-bearing and has a complex structure, making it difficult to implement in actual engineering. Ordinary steel bars are used to resist bending, and plastic hinge failure may also occur at the beam end. The energy-absorbing parts are only used to increase ductility and are directly buried in the concrete columns. After energy-absorbing damage under the action of an earthquake, they cannot be replaced, and the function of being repairable after an earthquake cannot be achieved.

[0004] Another example is the patent technology disclosed in the publication number CN109183985A, which uses a dog-bone steel beam at the end of a concrete precast beam; an end plate is set at the end of the dog-bone steel beam, which is connected to the precast column by through bolts. The plastic deformation of this node occurs at the dog-bone steel beam at the end of the beam, and the node stiffness is relatively small.

[0005] Therefore, how to achieve rapid assembly of prefabricated beams and columns, strengthen node structures and make energy-consuming parts replaceable has become a technical problem that technicians in this field need to solve urgently. Summary of the invention

[0006] In view of the above-mentioned defects of the prior art, the present invention provides a fully assembled prestressed concrete beam-column connector, the purpose of which is to avoid plastic hinge failure at the beam end, and the node plastic energy consumption only occurs in the ductile connector, so that the ductile connector can be replaced and the failed ductile connector can be repaired. Moreover, under the premise of being able to achieve large shear force transmission, the structure is simpler and the installation is more convenient.

[0007] To achieve the above-mentioned purpose, the present invention discloses a fully assembled prestressed concrete beam-column connector, which is arranged between a fully prefabricated prefabricated beam and a prefabricated column connected to the prefabricated beam, and the prefabricated column is a fully prefabricated column.

[0008] The connectors include column hidden corbels, beam end steel corbels and a number of ductile connectors;

[0009] The column hidden corbel is pre-buried in the prefabricated column, horizontally arranged at the column node area where the prefabricated column matches the prefabricated beam, and the end thereof extends out from the side of the prefabricated column;

[0010] The beam end steel corbel is pre-buried in the middle of the connection end of each prefabricated beam connected to the prefabricated column; and one end of the beam end steel corbel extends from the connection end of the corresponding prefabricated column and is connected to the corresponding column hidden corbel;

[0011] The plurality of ductile connectors are pre-buried in the prefabricated columns and are horizontally arranged at positions matching the plurality of prestressed threaded steel bars on the upper and lower sides of the prefabricated beams; and each of the ductile connectors is connected to the corresponding prestressed threaded steel bars.

[0012] Preferably, the prefabricated beam is a prefabricated prestressed concrete beam, which is provided with a steel cage consisting of a plurality of beam longitudinal bars and a plurality of beam stirrups inside; the prefabricated column is provided with a steel cage consisting of a plurality of column longitudinal bars and a plurality of column stirrups inside.

[0013] Preferably, each end of the hidden corbel of the column extending out of the side of the prefabricated column is provided with a stopper corresponding to the corresponding steel corbel at the beam end;

[0014] The portion of each beam end steel corbel extending from the connection end of the corresponding prefabricated column is provided with a limiting hole;

[0015] Each of the limiters comprises a shear pin and a bottom plate matching the corresponding limit hole;

[0016] The shear pins are fixed to the corresponding column corbels by welding the base plate.

[0017] More preferably, each connecting end of the prefabricated beam connected to the prefabricated column is provided with a U-shaped groove, and the corresponding steel corbel at the beam end is pre-embedded in the U-shaped groove; when each prefabricated beam is hoisted, it is put into place from the U-shaped groove, so that the limiting hole of the steel corbel at the beam end is connected to the corresponding limiter, and the U-shaped groove is closed by grouting.

[0018] Preferably, each of the beam end steel corbels embedded in the corresponding prefabricated beam is provided with a pull-out resistant steel pipe and a pad; each of the pull-out resistant steel pipes is arranged at the middle of the corresponding beam end steel corbel, and each of the pads is arranged at the end of the corresponding beam end steel corbel.

[0019] Preferably, a portion of each prefabricated beam corresponding to the corresponding beam end steel corbel pre-embedded in the prefabricated beam is provided with a plurality of steel corbel reinforcing longitudinal bars and a plurality of steel corbel reinforcing stirrups.

[0020] Preferably, the plurality of prestressed threaded steel bars on the upper and lower sides of each prefabricated beam are respectively connected to the corresponding plurality of ductile connectors through two adapter blocks;

[0021] Each of the prestressed threaded steel bars is welded and connected to the adapter block via a steel bar connector;

[0022] Each of the ductile connectors is connected to the adapter block via bolts.

[0023] Preferably, each of the ductile connectors comprises a steel core with an energy dissipation section and a steel pipe, and a mortar filler filled between the steel pipe and the steel core.

[0024] Beneficial effects of the present invention:

[0025] The prestressed threaded steel bars at the ends of the prefabricated beams of the present invention are resistant to bending and are always in an elastic state. The node plastic deformation only occurs on the ductile connectors, and the nodes only consume energy through the ductile connectors. Under the premise of being able to achieve large shear force transmission, the structure is simpler and the installation is more convenient. Moreover, the ductile connectors can be replaced and the failed ductile connectors can be repaired.

[0026] The patent of this invention can be used for low-rise and multi-story prefabricated frame structures, and can realize dry connection of prefabricated frame nodes, reduce on-site wet work workload, speed up construction progress, and enhance node performance. Through the energy consumption and replacement of ductile energy absorbers, the seismic fortification goals of no damage in small earthquakes, repairable in medium earthquakes, and not collapsing in large earthquakes can be achieved, thereby realizing a fully assembled concrete frame structure.

[0027] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic structural diagram of an embodiment of the present invention is shown.

[0029] Figure 2 A schematic diagram of the internal perspective structure of an embodiment of the present invention is shown.

[0030] Figure 3 A schematic structural diagram of the connection between a column concealed corbel and a beam end steel corbel in one embodiment of the present invention is shown.

[0031] Figure 4 A schematic diagram showing a steel cage structure in one embodiment of the present invention.

[0032] Figure 5 A schematic diagram of the internal perspective structure of a steel cage structure according to an embodiment of the present invention is shown.

[0033] Figure 6A schematic structural diagram of a ductile connector and a stress threaded steel bar connection in one embodiment of the present invention is shown.

[0034] Figure 7 A schematic structural diagram of a prefabricated column connection end in one embodiment of the present invention is shown.

[0035] Figure 8 A perspective structural diagram of a prefabricated column connection end in one embodiment of the present invention is shown.

[0036] Fig. 9 A schematic structural diagram of a prefabricated column in one embodiment of the present invention is shown.

[0037] Fig.10 A perspective structural diagram of a prefabricated column in one embodiment of the present invention is shown. DETAILED DESCRIPTION

[0038] like Figures 1 to 10 As shown, the connector of the fully assembled prestressed concrete beam-column is arranged between a fully prefabricated prefabricated beam 1 and a prefabricated column 2 connected to the prefabricated beam 1, and the prefabricated column 2 is a fully prefabricated column.

[0039] The connector includes a column hidden corbel 3, a beam end steel corbel 4 and a number of ductile connectors 5;

[0040] The column hidden corbel 3 is pre-buried in the precast column 2, and is horizontally arranged at the column node area where the precast column 2 matches the precast beam 1, and the end thereof extends out from the side of the precast column 2;

[0041] The beam end steel corbel 4 is pre-buried in the middle of the connection end of each precast beam 1 connected to the precast column 2; and one end of the beam end steel corbel 4 extends from the connection end of the corresponding precast column 2 and is connected to the corresponding column hidden corbel 3;

[0042] A plurality of ductile connectors 5 are pre-buried in the prefabricated column 2 and are horizontally arranged at positions matching a plurality of prestressed threaded steel bars 11 on the upper and lower sides of the prefabricated beam 1 ; and each ductile connector 5 is connected to a corresponding prestressed threaded steel bar 11 .

[0043] The principle of the present invention is that the shear force between the precast beam 1 and the precast column 2 is transmitted through the column hidden corbel 3 and the beam end steel corbel 4, and the bending moment between the precast beam 1 and the precast column 2 is transmitted to the ductile connector 5 by a plurality of stress threaded steel bars 11, and energy dissipation is achieved through the ductile connector 5.

[0044] In some embodiments, the precast beam 1 is a precast prestressed concrete beam, which is provided with a steel cage composed of a plurality of beam longitudinal bars 13 and a plurality of beam stirrups 14 inside; the precast column 2 is provided with a steel cage composed of a plurality of column longitudinal bars 21 and a plurality of column stirrups 22 inside.

[0045] In some embodiments, the end of each column hidden corbel 3 extending out of the side of the prefabricated column 2 is provided with a stopper 31 corresponding to the corresponding beam end steel corbel 4;

[0046] The portion of each beam end steel corbel 4 extending from the connection end of the corresponding prefabricated column 2 is provided with a limiting hole 41;

[0047] Each stopper 31 includes a shear pin and a bottom plate that match the corresponding stopper hole 41;

[0048] The shear pins are fixed to the corresponding column corbels 3 by welding through the base plate.

[0049] In some embodiments, each connection end of the prefabricated beam 1 connected to the prefabricated column 2 is provided with a U-shaped groove, and the corresponding beam end steel corbel 4 is embedded in the U-shaped groove; when each prefabricated beam 1 is hoisted, it is put into place from the U-shaped groove, so that the limiting hole 41 of the beam end steel corbel 4 is connected to the corresponding limiter 31, and the U-shaped groove is closed by grouting.

[0050] In some embodiments, each beam-end steel corbel 4 embedded in the portion of the corresponding prefabricated beam 1 is provided with an anti-pullout steel pipe 42 and a pad 43; each anti-pullout steel pipe 42 is arranged at the middle part of the corresponding beam-end steel corbel 4, and each pad 43 is arranged at the end of the corresponding beam-end steel corbel 4.

[0051] In some embodiments, a portion of each precast beam 1 corresponding to the corresponding beam end steel corbel 4 embedded in the precast beam 1 is provided with a plurality of steel corbel reinforcing longitudinal bars 12 and a plurality of steel corbel reinforcing stirrups 15 .

[0052] In some embodiments, the plurality of prestressed threaded steel bars 11 on the upper and lower sides of each precast beam 1 are connected to the corresponding plurality of ductile connectors 5 through two adapter blocks 6 respectively;

[0053] Each prestressed threaded steel bar 11 is welded and connected to the steel bar connector 61 and the adapter block 6;

[0054] Each ductile connector 5 is connected to the adapter block 6 via bolts 62 .

[0055] In certain embodiments, each ductile connector 5 includes a steel core with an energy dissipation section and a steel pipe 52 , and a mortar filler filled between the steel pipe 52 and the steel core.

[0056] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A fully assembled prestressed concrete beam-column connector, arranged between a fully prefabricated prefabricated beam (1) and a prefabricated column (2) connected to the prefabricated beam (1), wherein the prefabricated column (2) is a fully prefabricated column; characterized in that: The connector comprises a column concealed corbel (3), a beam end steel corbel (4) and a plurality of ductile connectors (5); The column hidden corbel (3) is pre-buried in the prefabricated column (2), horizontally arranged at the column node area where the prefabricated column (2) matches the prefabricated beam (1), and the end portion extends out from the side of the prefabricated column (2); The beam end steel corbel (4) is pre-buried in the middle of the connection end of each prefabricated beam (1) connected to the prefabricated column (2); and one end of the beam end steel corbel (4) extends from the connection end of the corresponding prefabricated column (2) and is connected to the corresponding column hidden corbel (3); The plurality of ductile connectors (5) are pre-buried in the prefabricated column (2) and are horizontally arranged at positions matching the plurality of prestressed threaded steel bars (11) on the upper and lower sides of the prefabricated beam (1); and each of the ductile connectors (5) is connected to the corresponding prestressed threaded steel bar (11); The end of each column hidden corbel (3) extending out of the side of the prefabricated column (2) is provided with a stopper (31) corresponding to the corresponding beam end steel corbel (4); The portion of each beam end steel corbel (4) extending from the connection end of the corresponding prefabricated column (2) is provided with a limiting hole (41); Each of the limiters (31) comprises a shear pin and a bottom plate that match the corresponding limit hole (41); The shear pins are fixed to the corresponding column corbels (3) by welding the base plate; Each connection end of the prefabricated beam (1) connected to the prefabricated column (2) is provided with a U-shaped groove, and the corresponding beam end steel corbel (4) is pre-embedded in the U-shaped groove; when each prefabricated beam (1) is hoisted, it is positioned from the U-shaped groove, so that the limiting hole (41) of the beam end steel corbel (4) is connected to the corresponding limiter (31), and the U-shaped groove is closed by grouting; The plurality of prestressed threaded steel bars (11) on the upper and lower sides of each prefabricated beam (1) are respectively connected to the corresponding plurality of ductile connectors (5) via two adapter blocks (6); Each of the prestressed threaded steel bars (11) is welded to the adapter block (6) via a steel bar connector (61); Each of the ductile connectors (5) is connected to the adapter block (6) via a bolt (62). Each of the ductile connectors (5) comprises a steel core with an energy dissipation section and a steel pipe (52), and a mortar filler filled between the steel pipe (52) and the steel core; The shear force between the precast beam (1) and the precast column (2) is transmitted through the column hidden corbel (3) and the beam end steel corbel (4), and the bending moment between the precast beam (1) and the precast column (2) is transmitted to the ductile connector (5) by a plurality of the prestressed threaded steel bars (11), and energy is dissipated through the ductile connector (5). By replacing the ductile connector (5), the failed ductile connector (5) is repaired; A first groove opening upward and a second groove opening downward are provided at the position where the corresponding adapter block (6) is arranged at the connection end of each prefabricated beam (1) connected to the prefabricated column (2).

2. The fully assembled prestressed concrete beam-column connector according to claim 1, characterized in that: The prefabricated beam (1) is a prefabricated prestressed concrete beam, and is provided with a steel cage composed of a plurality of beam longitudinal bars (13) and a plurality of beam stirrups (14) inside; the prefabricated column (2) is provided with a steel cage composed of a plurality of column longitudinal bars (21) and a plurality of column stirrups (22) inside.

3. The fully assembled prestressed concrete beam-column connector according to claim 1, characterized in that: The portion of each beam end steel corbel (4) pre-buried in the corresponding prefabricated beam (1) is provided with an anti-pulling steel pipe (42) and a pad (43); each anti-pulling steel pipe (42) is arranged at the middle portion of the corresponding beam end steel corbel (4), and each pad (43) is arranged at the end portion of the corresponding beam end steel corbel (4).

4. The fully assembled prestressed concrete beam-column connector according to claim 1, characterized in that: A portion of each prefabricated beam (1) corresponding to the corresponding beam end steel corbel (4) pre-embedded in the prefabricated beam (1) is provided with a plurality of steel corbel reinforcing longitudinal bars (12) and a plurality of steel corbel reinforcing stirrups (15).

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