Detachable assembly type beam column structure

Abstract

The invention provides a detachable assembly type beam column structure which comprises a prefabricated column, an overhanging beam and a prefabricated beam, one end of the prefabricated column extends outwards to form the overhanging beam, and the overhanging beam and the prefabricated beam are in joggle joint through an energy dissipation system; the energy dissipation system comprises a round-bottom flask-shaped energy dissipation piece which is formed by fixedly connecting a round-bottom flask-shaped energy dissipation steel plate and a transverse sliding steel plate, and the geometrical shape of the round-bottom flask-shaped energy dissipation steel plate comprises a set of semicircular arcs and two sets of mirrored 1 / 4 elliptic arcs; the vertical insertion piece comprises a first vertical embedded steel plate, a second vertical embedded steel plate, a vertical sliding steel plate and a vertical insertion steel plate, and an energy consumption piece sliding opening is formed in the middle of the vertical sliding steel plate; a secondary pin seat is arranged at the end part of the supporting plate, and is hinged with a primary pin seat which is vertically inserted into the steel plate through a round head pin shaft; the transverse sliding steel plate can be pushed and pulled along the vertical sliding steel plate so as to adjust the width of the abdomen of the round-bottom flask-shaped energy dissipation steel plate, and the vertex of the supporting plate is supported at the vertex of the abdomen of the round-bottom flask-shaped energy dissipation steel plate.

Description

Technical Field

[0001] The present invention relates to the technical field of civil engineering assembled structures, and in particular to a disassembled assembled beam-column connection structure based on energy dissipation. Background Art

[0002] Prefabricated buildings are called industrial buildings. As a new type of construction method, they have the advantages of controllable construction quality, short construction period, and green environmental protection. They effectively solve the problem of cast-in-place structures. Therefore, prefabricated buildings have become the main means for the construction industry to achieve energy conservation and emission reduction. Since the existing demolition methods of prefabricated buildings mostly use traditional blasting, manual and mechanical demolition, a large amount of construction waste and resource loss are generated during these demolition processes.

[0003] Prefabricated concrete structures are building structures that are prefabricated in the factory and then transported to the construction site and assembled on site. The integrity and seismic performance of the joints are relatively poor compared to cast-in-place structures. To ensure its seismic performance, the key is to ensure that the strength, stiffness and ductility of its weakest part - the beam-column joints meet the requirements.

[0004] Prefabricated beam-column connections are divided into two types: dry and wet. The wet connection is an irreversible connection method, the components cannot be reused, and a large amount of manpower is required for inspection and reinforcement after the earthquake, which is difficult to repair and costly. The dry connection is mainly through bolts and welding, which has poor energy dissipation capacity and cannot effectively absorb the energy released by the earthquake. The quality of on-site welding work is difficult to ensure, and the bolt holes weaken the strength of the section. Post-earthquake deformation will make disassembly difficult. Therefore, it is necessary to consider the recycling of connection nodes and the maintenance and replacement after the earthquake from the design, and propose a new type of assembled beam-column connection with good energy dissipation capacity and replaceable beam components. Summary of the invention

[0005] In view of the above technical bottlenecks, the present application provides a detachable assembled beam-column structure, comprising a prefabricated column (1), an outrigger beam (2) and a prefabricated beam (3). An outrigger beam (2) extends outward from one end of the prefabricated column (1), and the outrigger beam (2) is mortise-jointed with the prefabricated beam (3) via an energy dissipation system; The energy consumption system comprises: The round-bottom flask-shaped energy dissipation member (4) is formed by fixedly connecting a round-bottom flask-shaped energy dissipation steel plate (41) and a transverse sliding steel plate (42), wherein the geometric shape of the round-bottom flask-shaped energy dissipation steel plate (41) includes a group of semicircular arcs and two groups of mirrored 1 / 4 elliptical arcs; A vertical insert (5), comprising a first vertical embedded steel plate (51), a second vertical embedded steel plate (52), a vertical sliding steel plate (53) and a vertical insert steel plate (55), wherein an energy dissipation component sliding opening (54) is provided in the middle of the vertical sliding steel plate (53); The support plate (6) has a sub-pin seat (61) at its end, which is hinged to a female pin seat (56) vertically inserted into the steel plate (55) via a round-head pin shaft (7); The transverse sliding steel plate (42) can be pushed and pulled along the vertical sliding steel plate (53) to adjust the belly width of the round-bottomed flask-shaped energy-absorbing steel plate (41), and the apex of the support plate (6) is supported at the apex of the belly of the round-bottomed flask-shaped energy-absorbing steel plate (41).

[0006] In a possible implementation, the beam end of the cantilever beam (2) is stepped, comprising an upper cantilever beam step section (21) and a lower cantilever beam step section (22); the upper cantilever beam step section (21) is short and provided with a round-bottomed flask-shaped mortise (21a); ​​and the lower cantilever beam step section (22) is long and provided with a rectangular mortise (22a). The overlapped end of the precast beam (3) is provided with a stepped structure complementary to the cantilever beam (2), comprising an upper step section (31) of the precast beam and a lower step section (32) of the precast beam, wherein the upper step section (31) of the precast beam is a long step and the lower step section (32) of the precast beam is a short step; The overlapping surfaces of the cantilever beam (2) and the prefabricated beam (3) comprise an upper vertical overlapping surface (9), a transverse overlapping surface (10) and a lower vertical overlapping surface (11), and grouting material is injected into the overlapping surfaces for filling.

[0007] In a possible implementation, the width of the round-bottomed flask-shaped mortise (21a) is the sum of the thickness of the vertically inserted steel plate (55) and the round-bottomed flask-shaped energy-absorbing steel plate (41); The width of the rectangular mortise (22a) is equal to the thickness of the first vertical embedded steel plate (51), and its height and length pass through the step opening of the lower step section (22) of the cantilever beam.

[0008] In a possible implementation, the transverse sliding steel plate (42) is provided with two insert sliding openings (42b) and a sliding steel plate (42a) along the height direction, the insert sliding opening (42b) is slidably matched with the vertical sliding steel plate (53), and the sliding steel plate (42a) is slidably matched with the energy-absorbing component sliding opening (54); A deformation space is reserved between the bottom of the round-bottom flask-shaped energy-absorbing steel plate (41) and the end of the vertically inserted steel plate (55), and the spacing is 10-30 mm.

[0009] In a possible implementation, in the vertical insert (5), the height of the first vertical embedded steel plate (51) is equal to the beam height of the prefabricated beam (3), and the height of the second vertical embedded steel plate (52) is equal to the overhanging height of the upper step section (31) of the prefabricated beam; The female pin seats (56) are symmetrically arranged on both sides of the vertically inserted steel plate (55), and the center line thereof passes through the center of the round-bottom flask-shaped energy-absorbing steel plate (41).

[0010] In a possible implementation, the diameters of the pin holes of the female pin seat (56) and the sub-pin seat (61) are equal, and the bottom of the round head pin shaft (7) is provided with a thread and is locked by a nut (8); The contact surface between the support vertex of the support plate (6) and the belly vertex of the round-bottomed flask-shaped energy-absorbing steel plate (41) is in an arc shape, and the radius of curvature is consistent with the curvature of the belly of the energy-absorbing steel plate.

[0011] In a possible implementation, the neck width of the round-bottom flask-shaped energy-absorbing steel plate (41) is 1.2-1.5 times the thickness of the vertically inserted steel plate (55), and the maximum width of the abdomen is 3-4 times the neck width; The ratio of the major semi-axis to the minor semi-axis of the 1 / 4 elliptical arc is 2:1 to 3:1.

[0012] In a possible implementation, the compressive strength of the grouting material is not less than 1.2 times the concrete strength of the prefabricated beam (3); The grouting material filling thickness of the overlapping surfaces (9, 10, 11) is 5-15 mm.

[0013] Due to the adoption of the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention provides a detachable assembled beam-column connection method based on energy dissipation. The prefabricated beams and prefabricated columns are mortised by an energy dissipation system. There is no need to spend manpower and time on on-site bolt tightening or on-site welding. The end of the energy dissipation part can be stretched to make the arc smooth, and the installation is convenient. There is no need for on-site cutting during disassembly, which protects the original components to the greatest extent and ensures that the detachable beam starts a second life and can be reused at the end of its first normal service life.

[0014] The energy-absorbing parts are designed to be multi-arc. Under the action of earthquake, the energy-absorbing parts absorb earthquake energy and exert energy-absorbing effects through deformation, thus improving the energy-absorbing capacity of the core area of ​​the node. Through deconstruction design, the plastic hinge is moved outward to the disassembly point, which improves the seismic performance of the core area of ​​the node; the damage position is transferred from the core area of ​​the node to the disassembly point and prefabricated beam, and the components can be quickly replaced after the earthquake, which reduces the cost of later maintenance and reinforcement, avoids large-scale demolition and reconstruction of the building, and meets the requirements of green construction throughout the process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 This is a schematic diagram of the overall structure of the detachable assembled beam-column connection structure provided by the present invention; Figure 2 A schematic top view of a detachable assembled beam-column connection structure provided by the present invention; Figure 3 It is a structural schematic diagram of the prefabricated column and the cantilever beam of the present invention; Figure 4 It is a structural schematic diagram of the prefabricated beam and energy dissipation system of the present invention; Figure 5 It is a schematic structural diagram of a round-bottom flask-shaped energy dissipation component of the present invention; Figure 6 It is a schematic diagram of the geometric shape of the round-bottom flask-shaped energy dissipation member of the present invention; Figure 7 It is a schematic structural diagram of a vertical insert of the present invention; Figure 8 It is a schematic structural diagram of the support plate, round head pin and nut of the present invention.

[0017] In the figure, 1, precast column; 2, cantilever beam; 21, upper step section of cantilever beam; 21a, round-bottom flask-shaped mortise; 22, lower step section of cantilever beam; 22a, rectangular mortise; 3, precast beam; 31, upper step section of precast beam; 32, lower step section of precast beam; 4, round-bottom flask-shaped energy-absorbing part; 41, round-bottom flask-shaped energy-absorbing steel plate; 42, horizontal sliding steel plate; 42a, sliding steel plate; 42b, sliding opening of insert; 5, vertical insert; 51, first vertical embedded steel plate; 52, second vertical embedded steel plate; 53, vertical sliding steel plate; 54, sliding opening of energy-absorbing part; 55, vertical insertion steel plate; 56, female pin seat; 6, support plate; 61, sub-pin seat; 7, round head pin shaft; 8, nut. DETAILED DESCRIPTION

[0018] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] As attached Figure 1-2 As shown, the detachable assembled beam-column structure includes a prefabricated column 1, an outrigger beam 2, a prefabricated beam 3, an energy dissipation system and a support system. The outrigger beam 2 extends outward from one end of the prefabricated column 1, and the outrigger beam 2 is connected to the prefabricated beam 3 through a stepped mortise and tenon structure, and the energy dissipation system provides seismic energy dissipation capabilities. The energy dissipation system consists of a round-bottom flask-shaped energy dissipation part 4, a vertical insert 5 and a support plate 6, and realizes dynamic energy dissipation and disassembly functions through an adjustable sliding connection and hinge mechanism.

[0022] See also Figure 3 , which is a schematic diagram of the structure of the prefabricated column and the cantilever beam of the present invention.

[0023] The prefabricated column 1 is prefabricated with reinforced concrete, and one end thereof extends outward to form an outrigger beam 2. The beam end of the outrigger beam 2 is designed to be stepped, including an upper step section 21 (short step) of the outrigger beam and a lower step section 22 (long step) of the outrigger beam, forming a hidden corbel structure.

[0024] The stepped section 21 on the outrigger beam is provided with a round-bottomed flask-shaped mortise 21a that runs through the beam height, and its inner contour is composed of a group of semicircular arcs and a rectangular section extending to the beam end. The width of the rectangular section is the sum of the thickness of the vertically inserted steel plate 55 and the round-bottomed flask-shaped energy-absorbing steel plate 41 (see attached Figure 6).

[0025] The lower step section 22 of the cantilever beam is provided with a rectangular mortise 22 a penetrating the step opening, the width of which is equal to the thickness of the first vertical embedded steel plate 51 , and is used to accommodate the vertical insert 5 .

[0026] See also Figure 4 , is a schematic diagram of the structure of the precast beam and energy dissipation system of the present invention. The overlapped end of the precast beam 3 is designed to be a stepped type complementary to the cantilever beam 2, including an upper step section 31 (long step) of the precast beam and a lower step section 32 (short step) of the precast beam.

[0027] Precast beam upper step section 31: a first vertical embedded steel plate 51 is embedded along the beam centerline, and its length is equal to the overhanging length of the precast beam upper step section 31 plus the thickness of the concrete protective layer (≥20 mm).

[0028] Precast beam lower step section 32: Two second vertical embedded steel plates 52 are embedded in the end surface and welded to both sides of the first vertical embedded steel plate 51. The height of the second vertical embedded steel plate 52 is equal to the overhanging height of the precast beam upper step section 31.

[0029] The energy consumption system provided by an exemplary embodiment of the present application can be found in Figures 5 to 7 , round bottom flask shaped energy dissipation part 4: It is welded by a round bottom flask shaped energy dissipation steel plate 41 and a transverse sliding steel plate 42. The geometric shape of the round bottom flask shaped energy dissipation steel plate 41 includes a set of semicircular arcs (radius R = 50-80mm) and two sets of mirrored 1 / 4 elliptical arcs (long semi-axis a = 100-150mm, short semi-axis b = 30-50mm), forming an energy dissipation structure with a wide belly and a thin neck, and the neck width is 1.2-1.5 times the thickness of the vertically inserted steel plate 55 (as shown in the attached Figure 6 as shown).

[0030] Horizontal sliding steel plate 42: Two insert sliding openings 42b (height H=80-100mm) and a sliding steel plate 42a are provided along the height direction. The height of the sliding steel plate 42a matches the energy-absorbing member sliding opening 54, and can be pushed and pulled along the vertical sliding steel plate 53 to adjust the belly width of the round-bottom flask-shaped energy-absorbing steel plate 41.

[0031] The vertical insert 5 includes a first vertical embedded steel plate 51, a second vertical embedded steel plate 52, a vertical sliding steel plate 53 and a vertical insert steel plate 55. The vertical sliding steel plate 53 is provided with an energy dissipation member sliding opening 54 in the middle, and six female pin seats 56 are symmetrically welded on both sides of the vertical insert steel plate 55. The center line of the pin hole passes through the center of the round bottom flask-shaped energy dissipation steel plate 41 (see attached figure). Figure 7 as shown).

[0032] See also Figure 8, is a schematic diagram of the structure of the support plate, round pin and nut of the present invention. Two sub-pin seats 61 are provided at the end, which are hinged to the female pin seat 56 through the round pin 7. The bottom of the round pin 7 is provided with a thread, which is locked by the nut 8. The vertex of the support plate 6 is an arc-shaped contact surface (the curvature radius is consistent with the belly of the energy-absorbing steel plate 41), which is supported at the belly vertex of the round-bottomed flask-shaped energy-absorbing steel plate 41 to ensure that the support plate can rotate with the deformation when the energy-absorbing part is under pressure.

[0033] The following is a further detailed description of this structure in combination with the assembly and disassembly steps: Step 1: Welding the vertical insert 5. Weld the first vertical embedded steel plate 51 and the second vertical embedded steel plate 52 to form the frame of the vertical insert 5, and then weld the vertical sliding steel plate 53 and the vertical insert steel plate 55, leaving a sliding opening 54 for the energy dissipation part.

[0034] Step 2: Casting precast components. Weld the welded vertical insert 5 to the steel cage of the precast beam 3, and cast concrete to form the precast beam 3; cast the precast column 1 and the outrigger beam 2 at the same time, and reserve the round-bottom flask-shaped mortise 21a and the rectangular mortise 22a.

[0035] Step 3: Making energy dissipation parts and support plates: Weld the round-bottom flask-shaped energy dissipation steel plate 41 to the transverse sliding steel plate 42 , and weld the female pin seat 56 to the vertical insertion steel plate 55 .

[0036] Step 4: Lift the prefabricated column 1 and the cantilever beam 2, and fix them after positioning.

[0037] Step 5: Install the prefabricated beam 3. Push the transverse sliding steel plate 42 to reduce the belly width of the round bottom flask-shaped energy dissipation steel plate 41, align the stepped end of the prefabricated beam 3 with the stepped end of the outrigger beam 2, and insert it into the mortise from top to bottom.

[0038] Step 6: Adjust the energy dissipation part. Pull the transverse sliding steel plate 42 to restore the round-bottomed flask-shaped energy dissipation steel plate 41 to its original shape and completely fill the round-bottomed flask-shaped mortise 21a.

[0039] Step 7: Install the support plate 6. Align the sub-pin seat 61 of the support plate 6 with the female pin seat 56, insert the round head pin shaft 7 and tighten the nut 8 to ensure that the top of the support plate fits tightly against the belly of the energy-absorbing steel plate.

[0040] Step 8: Grouting. Inject high-strength grouting material (compressive strength ≥ 50MPa) into the upper vertical overlap surface 9, transverse overlap surface 10 and lower vertical overlap surface 11 of the cantilever beam 2 and the precast beam 3, with a filling thickness of 5-15mm, and form a rigid connection after solidification.

[0041] Step 9: When disassembling, loosen the nut 8, pull out the round pin 7, and remove the support plate 6.

[0042] Step 10: Push the transverse sliding steel plate 42 to reduce the belly width of the energy-absorbing part, and vertically lift the prefabricated beam 3 from the mortise of the cantilever beam 2 to achieve non-destructive disassembly.

[0043] Step 11: After replacing the damaged precast beam 3 or energy absorbing part 4, repeat steps 5-8 to reinstall it.

[0044] The structure provided by the present application has an energy-absorbing part designed in the shape of a round-bottom flask with a wide belly and a thin neck, which improves the tensile performance at the disassembly point; at the same time, under the action of an earthquake, the energy-absorbing part consumes the earthquake energy through deformation, plays an energy-absorbing role, and improves the energy-absorbing capacity of the core area of ​​the node. Through the disassembly design, the installation of components does not require manpower and time to tighten a large number of bolts on site, nor does it require on-site welding, and the quality of on-site operations can be controlled; the plastic hinge is moved outward to the disassembly point position, which improves the seismic performance of the core area of ​​the node, and the damage position is transferred from the core area of ​​the node to the disassembly point and the prefabricated beam. After the earthquake, the components can be quickly replaced, reducing the cost of later maintenance and reinforcement, and avoiding large-scale demolition and reconstruction of the building; at the same time, the disassembly beam may begin to be reused for a second life at the end of the first service life, saving energy and reducing emissions, meeting the requirements of green construction throughout the process, and is easy to promote and use.

[0045] The invention concept is described in detail using specific examples herein, and the description of the above embodiments is only used to help understand the core idea of ​​the invention. It should be pointed out that any obvious modification, equivalent substitution or other improvement made by a person of ordinary skill in the art without departing from the invention concept should be included in the protection scope of the present invention.

[0046] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are considered to be exemplary only, and the true scope and spirit of the present application are indicated by the above-mentioned claims.

[0047] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

[0048] It should be understood that the "plurality" mentioned in this article refers to two or more. "And / or" describes the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0049] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0050] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A detachable assembled beam-column structure, comprising a prefabricated column (1), an outrigger beam (2) and a prefabricated beam (3), characterized in that: An outrigger beam (2) extends outward from one end of the prefabricated column (1), and the outrigger beam (2) is mortise-jointed with the prefabricated beam (3) via an energy dissipation system; The energy consumption system comprises: The round-bottom flask-shaped energy dissipation member (4) is formed by fixedly connecting a round-bottom flask-shaped energy dissipation steel plate (41) and a transverse sliding steel plate (42), wherein the geometric shape of the round-bottom flask-shaped energy dissipation steel plate (41) includes a group of semicircular arcs and two groups of mirrored 1 / 4 elliptical arcs; A vertical insert (5), comprising a first vertical embedded steel plate (51), a second vertical embedded steel plate (52), a vertical sliding steel plate (53) and a vertical insert steel plate (55), wherein an energy dissipation member sliding opening (54) is provided in the middle of the vertical sliding steel plate (53); The support plate (6) has a sub-pin seat (61) at its end, which is hinged to a female pin seat (56) vertically inserted into the steel plate (55) via a round-head pin shaft (7); The transverse sliding steel plate (42) can be pushed and pulled along the vertical sliding steel plate (53) to adjust the belly width of the round-bottomed flask-shaped energy-absorbing steel plate (41), and the apex of the support plate (6) is supported at the apex of the belly of the round-bottomed flask-shaped energy-absorbing steel plate (41).

2. The structure according to claim 1, characterized in that: The beam end of the cantilever beam (2) is stepped, comprising an upper cantilever beam step section (21) and a lower cantilever beam step section (22); the upper cantilever beam step section (21) is short and provided with a round-bottomed flask-shaped mortise (21a); ​​and the lower cantilever beam step section (22) is long and provided with a rectangular mortise (22a). The overlapped end of the precast beam (3) is provided with a stepped structure complementary to the cantilever beam (2), comprising an upper step section (31) of the precast beam and a lower step section (32) of the precast beam, wherein the upper step section (31) of the precast beam is a long step and the lower step section (32) of the precast beam is a short step; The overlapping surfaces of the cantilever beam (2) and the prefabricated beam (3) comprise an upper vertical overlapping surface (9), a transverse overlapping surface (10) and a lower vertical overlapping surface (11), and grouting material is injected into the overlapping surfaces for filling.

3. The structure according to claim 2, characterized in that: The width of the round-bottomed flask-shaped mortise (21a) is the sum of the thickness of the vertically inserted steel plate (55) and the round-bottomed flask-shaped energy-absorbing steel plate (41); The width of the rectangular mortise (22a) is equal to the thickness of the first vertical embedded steel plate (51), and its height and length pass through the step opening of the lower step section (22) of the cantilever beam.

4. The structure according to claim 1, characterized in that: The transverse sliding steel plate (42) is provided with two insert sliding openings (42b) and a sliding steel plate (42a) along the height direction, the insert sliding opening (42b) is slidably matched with the vertical sliding steel plate (53), and the sliding steel plate (42a) is slidably matched with the energy-absorbing component sliding opening (54); A deformation space is reserved between the bottom of the round-bottom flask-shaped energy-absorbing steel plate (41) and the end of the vertically inserted steel plate (55), and the spacing is 10-30 mm.

5. The structure according to claim 1, characterized in that: In the vertical insert (5), the height of the first vertical embedded steel plate (51) is equal to the beam height of the prefabricated beam (3), and the height of the second vertical embedded steel plate (52) is equal to the overhanging height of the upper step section (31) of the prefabricated beam; The female pin seats (56) are symmetrically arranged on both sides of the vertically inserted steel plate (55), and the center line thereof passes through the center of the round-bottom flask-shaped energy-absorbing steel plate (41).

6. The structure according to claim 5, characterized in that: The pin holes of the female pin seat (56) and the male pin seat (61) have the same diameter, and the bottom of the round head pin shaft (7) is provided with a thread and is locked by a nut (8); The contact surface between the support vertex of the support plate (6) and the belly vertex of the round-bottomed flask-shaped energy-absorbing steel plate (41) is in an arc shape, and the radius of curvature is consistent with the curvature of the belly of the energy-absorbing steel plate.

7. The structure according to claim 1, characterized in that: The neck width of the round-bottom flask-shaped energy-absorbing steel plate (41) is 1.2-1.5 times the thickness of the vertically inserted steel plate (55), and the maximum width of the abdomen is 3-4 times the neck width; The ratio of the major semi-axis to the minor semi-axis of the 1 / 4 elliptical arc is 2:1 to 3:

1.

8. The structure according to claim 1, characterized in that: The compressive strength of the grouting material is not less than 1.2 times the concrete strength of the precast beam (3); The grouting material filling thickness of the overlapping surfaces (9, 10, 11) is 5-15 mm.

Images