Assembly type shear wall with vertical joints based on rotation type metal damper connection

Abstract

The invention relates to a vertical joint assembly type shear wall based on rotation type metal damper connection, the vertical joint assembly type shear wall comprises a left side wall body and a right side wall body, a metal damper is arranged between the left side wall body and the right side wall body, the metal damper comprises a left side base and a right side base, a left side rotating shaft is rotatably assembled on the left side base, and a right side rotating shaft is rotatably assembled on the right side base; the metal damper further comprises an energy consumption piece, the two ends of the energy consumption piece are connected with the left rotating shaft and the right rotating shaft respectively, a left frame is fixed to the left base, and a right frame is fixed to the right base. The front side plate of the left side frame and the front side plate of the right side frame, and the rear side plate of the left side frame and the rear side plate of the right side frame are in guide moving fit in the vertical direction through concave-convex matching structures in concave-convex fit. The technical problem that in the prior art, when an earthquake occurs, relative deformation is likely to happen between every two adjacent wall bodies, and consequently the effect of bending moment on damping pieces is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated buildings, and particularly to a prefabricated shear wall with a vertical joint connected by a rotational metal damper. Background Art

[0002] In the field of construction, prefabricated buildings have received extensive attention due to their high efficiency, environmental protection, and economy. As a structural unit for resisting lateral forces, prefabricated shear walls have characteristics such as high stiffness and high bearing capacity, and are the main lateral force resisting members of multi-story and high-rise frame-shear wall structures or shear wall structures. Under the background of new building industrialization and the "dual carbon" goal, it is particularly important to develop prefabricated shear walls with good mechanical properties.

[0003] In this context, as a key component of the structural system, prefabricated shear walls have achieved rapid installation and quality control of the structure through prefabrication technology, improving the seismic performance and construction efficiency of buildings. Due to the relatively large overall stiffness of shear walls, stress concentration is likely to occur under earthquake action, putting them in a complex stress state of simultaneous bending, shearing, and torsion, making them prone to brittle failure, difficult to repair after an earthquake, and accompanied by high economic costs. Therefore, some studies have proposed to improve the overall performance of prefabricated shear walls by adopting a connection form with vertical joints in the shear walls.

[0004] In the research on prefabricated shear walls with vertical joints, compared with traditional prefabricated shear walls, such shear walls with vertical joints can better assist steel frames in absorbing seismic energy and improve the deformation capacity of shear walls, but their bearing capacity and stiffness decrease more. To solve the above problems, in recent years, some studies have proposed to add metal dampers with certain energy dissipation capabilities at vertical joints and utilize their energy dissipation characteristics to reduce the vibration response of the structure, making them the first line of seismic defense for structures or components under earthquake action. At present, most domestic and foreign scholars use a fixed connection form for the connection between the metal dampers set at the vertical joints of prefabricated shear walls and the two side wall limbs. When the two side wall limbs of the shear wall on both sides of the vertical joint are subjected to extreme loads such as earthquakes, relative deformation occurs between the two side wall limbs, and the bending moment at the connection position of the metal damper at the vertical joint with the two side wall limbs is the largest, resulting in adverse load concentration at the connection with the two side wall limbs, so that the material properties of the metal damper cannot be fully exerted, reducing the energy dissipation capacity of the metal damper. Summary of the Invention

[0005] The purpose of the present invention is to provide a prefabricated shear wall with a vertical joint connected by a rotational metal damper to solve the technical problem in the prior art that relative deformation is likely to occur between two adjacent walls during an earthquake, resulting in a large bending moment on the damper member.

[0006] To solve the above technical problems, the technical solution of a prefabricated shear wall in the present invention is as follows: An assembled shear wall with a vertical joint connected by a rotational metal damper, comprising a left wall and a right wall. There is a vertical joint between the left wall and the right wall, and a metal damper is arranged in the vertical joint. The metal damper includes a left base fixed on the right side of the left wall and a right base fixed on the left side of the right wall. A left rotating shaft with a rotation axis extending in the front-rear direction is rotatably assembled on the left base, and a right rotating shaft with a rotation axis extending in the front-rear direction is rotatably assembled on the right base. The metal damper further includes an energy-consuming member made of shape memory alloy. One end of the energy-consuming member is fixedly connected to the left rotating shaft, and the other end of the energy-consuming member is fixedly connected to the right rotating shaft. A left frame is fixed on the left base, and a right frame is fixed on the right base. The left frame has a left front side plate and a right front side plate located on both sides of the energy-consuming member in the front-rear direction. The right frame has a right front side plate and a right rear side plate located on both sides of the energy-consuming member in the front-rear direction. The left front side plate of the left frame and the right front side plate of the right frame are in guiding movement cooperation in the up-down direction through a front-side concave-convex matching structure; the left rear side plate of the left frame and the right rear side plate of the right frame are in guiding movement cooperation in the up-down direction through a rear-side concave-convex matching structure.

[0007] Further, there are two metal dampers, and the two metal dampers are arranged at intervals in the up-down direction.

[0008] Further, both ends of the energy-consuming member are a left connection end and a right connection end that have been subjected to electromagnetic induction heating treatment, and the hardness of the left connection end and the right connection end is greater than the hardness of the energy-consuming member between the left connection end and the right connection end.

[0009] Further, the left connection end is threadedly connected to the left rotating shaft, and the right connection end is threadedly connected to the right rotating shaft.

[0010] Further, a left installation groove is provided on the right side of the left wall, and the left base is embedded and fixed in the left installation groove; a right installation groove is provided on the left side of the right wall, and the right base is embedded and fixed in the right installation groove.

[0011] Further, the left front side plate and the left rear side plate of the left frame have first protrusions with opposite protruding directions, and the right front side plate and the right rear side plate of the right frame have second protrusions with opposite protruding directions. The first protrusions are disposed opposite to the inner sides of the second protrusions.

[0012] Further, a first long hole extending in the up-down direction is provided on the first protrusion, a second long hole corresponding to the first long hole is provided on the second protrusion, and a limit screw for restricting the up-down movement limit of the left frame relative to the right frame is inserted through the long holes of the two first protrusions and the two second protrusions.

[0013] Further, a first left half-slot is provided at the right end of the left base. A left semi-circular fastener is fixed to the right end of the left base by bolts. The left semi-circular fastener has a second left half-slot corresponding to the first left half-slot. The left rotating shaft is rotatably assembled between the first left half-slot and the second left half-slot. A first right half-slot is provided at the left end of the right base. A right semi-circular fastener is fixed to the left end of the right base by bolts. The right semi-circular fastener has a second right half-slot corresponding to the first right half-slot. The right rotating shaft is rotatably assembled between the first right half-slot and the second right half-slot.

[0014] Further, the left frame further includes a left frame vertical plate connected to the left ends of the front side plate and the rear side plate of the left frame. The left frame vertical plate is fixed to the left base by bolts. A left avoidance groove for avoiding the left semi-circular fastener is provided on the left frame vertical plate. The right frame further includes a right frame vertical plate connected to the right ends of the front side plate and the rear side plate of the right frame. A right avoidance groove for avoiding the right semi-circular fastener is provided on the right frame vertical plate.

[0015] The beneficial effects of the present invention are as follows: In the present invention, when an earthquake occurs, the left wall will produce a displacement in the up and down direction relative to the right wall. At this time, the rotating shafts connected to both ends of the energy dissipation member can rotate to adapt to the displacement between the left wall and the right wall. The energy dissipation member made of shape memory alloy has characteristics such as superelasticity, high damping, and elastic modulus varying with temperature. The characteristics of the energy dissipation member itself realize elastic energy dissipation and self-resetting ability. At the same time, during the relative movement of the left wall and the right wall in the up and down direction, the front side plate of the left frame contacts and slides with the front side plate of the right frame for energy dissipation, and the rear side plate of the left frame contacts and slides with the rear side plate of the right frame for energy dissipation. At the same time, the front-side concave-convex matching structure and the rear-side concave-convex matching structure enable the left frame and the right frame to limit the distance between the left wall and the right wall. The left frame and the right frame only undergo relative sliding in the vertical direction during an earthquake and will not produce horizontal sliding, effectively ensuring the connection structure inside the metal damper. The energy dissipation member will not bear the shear bearing capacity caused by the approach or separation of the two walls, reducing the post-earthquake maintenance and reconstruction costs. Description of the Drawings

[0016] By reading the following detailed description with reference to the drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present disclosure will become readily understandable. In the drawings, several embodiments of the present disclosure are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 is a schematic structural diagram of an embodiment of the prefabricated shear wall in the present invention; Figure 2 is Figure 1 an exploded view of the metal damper in Figure 3 Is Figure 2 An exploded view of the left base, right base and energy-consuming member in the top-down direction in Figure 4 Is Figure 1 A schematic diagram of the cooperation between the metal damper and the left wall and right wall in the top-down direction in Figure 5 Is Figure 4 The three-dimensional view of Figure 6 Is a schematic diagram of the structure of the right base of the metal damper in the present invention; Figure 7 Is a schematic diagram of the structure of the right semi-circular fastener in the present invention; Figure 8 Is a schematic diagram of the structure of the right rotating shaft in the present invention; Figure 9 Is a schematic diagram of the structure of the energy-consuming member in the present invention; Figure 10 Is a schematic diagram of the structure of the left frame in the present invention; Figure 11 Is the top view of the left frame in the present invention; Figure 12 Is a schematic diagram of the structure of the right frame in the present invention; Figure 13 Is the top view of the right frame in the present invention; Figure 14 Is a schematic diagram of the cooperation between the right base and the right semi-circular fastener in the present invention; 1-1, left wall; 1-2, right wall; 2, metal damper; 3, right frame; 4, left frame; 5, left base; 6, right base; 7, left semi-circular fastener; 8, right semi-circular fastener; 9, energy-consuming member; 11, left first half groove; 12, left second half groove; 13, left rotating shaft; 14, right rotating shaft; 15, right first half groove; 16, right second half groove; 17, left frame vertical plate; 18, right frame vertical plate; 19, left frame front side plate; 20, right frame front side plate; 21, left frame rear side plate; 22, right frame rear side plate; 23, first protrusion; 24, base installation groove; 25, frame installation surface; 26, energy-consuming member avoidance hole; 27, rotating shaft threaded hole; 28, left connection end; 29, right connection end; 30, first long hole; 31, left avoidance groove; 32, second long hole; 33, right avoidance groove; 34, second protrusion. Detailed implementation mode

[0017] For the convenience of understanding the present invention, the present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments. The preferred embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present invention more thorough and comprehensive.

[0018] It should be noted that unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not used to limit the present invention.

[0019] An example of an assembled shear wall with a vertical joint connected by a rotational metal damper in the present invention is as Figures 1 to 4 shown: It includes a left wall 1-1 and a right wall 1-2. Both the left wall 1-1 and the right wall 1-2 are precast walls. There is a vertical joint between the left wall and the right wall, and two metal dampers 2 are arranged at intervals in the vertical direction in the vertical joint.

[0020] The metal damper 2 includes a left base 5 fixed on the right side surface of the left wall and a right base 6 fixed on the left side surface of the right wall. In this embodiment, a left installation groove is provided on the right side surface of the left wall, and the left base is embedded and fixed in the left installation groove; a right installation groove is provided on the left side surface of the right wall, and the right base is embedded and fixed in the right installation groove.

[0021] A left rotating shaft 13 with a rotation axis extending in the front-rear direction is rotatably assembled on the left base 5, and a right rotating shaft 14 with a rotation axis extending in the front-rear direction is rotatably assembled on the right base 6. The metal damper further includes an energy dissipation member 9 made of shape memory alloy. The energy dissipation member 9 is in a rod shape. One end of the energy dissipation member 9 is fixedly connected to the left rotating shaft 13, and the other end of the energy dissipation member 9 is fixedly connected to the right rotating shaft 10.

[0022] In this embodiment, the two ends of the energy dissipation member are a left connection end 28 and a right connection end 29 that have been subjected to electromagnetic induction heating treatment. The hardness of the left connection end 28 and the hardness of the right connection end 29 are greater than the hardness of the energy dissipation member between the left connection end and the right connection end. The left connection end is threadedly connected to the left rotating shaft, and the right connection end is threadedly connected to the right rotating shaft. Item 27 in the figure represents the shaft threaded hole on the right rotating shaft for realizing the connection with the right connection end.

[0023] At the right end of the left base, there is a first left half-slot 11. The right end of the left base is fixed with a left semi-circular fastener 7 by bolts. The left semi-circular fastener 7 has a second left half-slot 12 corresponding to the first left half-slot 11. The left rotating shaft 13 is rotatably assembled between the first left half-slot 11 and the second left half-slot 12. At the left end of the right base, there is a first right half-slot 15. The left end of the right base is fixed with a right semi-circular fastener 8 by bolts. The right semi-circular fastener 8 has a second right half-slot 16 corresponding to the first right half-slot 15. The right rotating shaft 14 is rotatably assembled between the first right half-slot 15 and the second right half-slot 16. Specifically, on the opposite sides of the left base and the right base, there is a fastener installation groove 24. The front and rear sides of the fastener installation groove 24 are frame installation surfaces 25 that are higher than the fastener installation groove. The left semi-circular fastener 7 and the right semi-circular fastener 8 are fixed in the corresponding fastener installation grooves by bolts. Item 26 in the figure represents an energy-consuming component avoidance hole provided on the corresponding semi-circular space for avoiding the energy-consuming component.

[0024] The left frame has a left front frame side plate 19 and a right front frame side plate 20 located on the front and rear sides of the energy-consuming component. The right frame has a right front frame side plate 20 and a right rear frame side plate 22 located on the front and rear sides of the energy-consuming component. The left front frame side plate and the right front frame side plate are in guiding movement cooperation in the up and down directions through a front-side concave-convex cooperation structure. The left rear frame side plate and the right rear frame side plate are in guiding movement cooperation in the up and down directions through a rear-side concave-convex cooperation structure.

[0025] Specifically, the left frame further includes a left frame vertical plate 17 connected to the left ends of the left front frame side plate and the left rear frame side plate. The left frame vertical plate 17 is fixed to the frame installation surface of the left base by bolts. A left avoidance groove 31 for avoiding the left semi-circular fastener is provided on the left frame vertical plate, and the opening of the left avoidance groove 31 faces downward. The right frame further includes a right frame vertical plate 18 connected to the right ends of the right front frame side plate and the right rear frame side plate. The right frame vertical plate 18 is fixed to the frame installation surface of the right base by bolts. A right avoidance groove 33 for avoiding the right semi-circular fastener is provided on the right frame vertical plate, and the opening of the right avoidance groove 33 faces upward.

[0026] The front side plate of the left frame and the rear side plate of the left frame have first protrusions 23 with opposite protruding directions, and the front side plate of the right frame and the rear side plate of the right frame have second protrusions 34 with opposite protruding directions. The first protrusions are disposed in a butt-jointed manner inside the second protrusions. The first protrusions and the second protrusions at the front position form a front-side concave-convex matching structure; the first protrusions and the second protrusions at the rear position form a rear-side concave-convex matching structure. A first long hole 30 extending in the up-down direction is provided on the first protrusion, and a second long hole 32 corresponding to the first long hole is provided on the second protrusion. A limiting screw rod (not shown in the figure) for restricting the up-down movement limit of the left frame relative to the right frame is inserted through the long holes of the two first protrusions and the two second protrusions.

[0027] In the present invention, two metal dampers are arranged at the vertical joint at intervals in the up-down direction. The left base and the left semi-circular fastener are connected into a whole by bolts, and the right base and the right semi-circular fastener are connected into a whole by bolts, so that while the left rotating shaft and the right rotating shaft are limited, the effect of being able to rotate in the corresponding notch can be achieved. Thus, during an earthquake, the two walls are deformed upward at the vertical joint, and the left rotating shaft and the right rotating shaft can rotate at a certain angle in the notch following the deformation at the vertical joint position. Since an energy dissipation member made of shape memory alloy (SMA) material is installed between the left rotating shaft and the right rotating shaft, when deformation occurs at the vertical joint and the two rotating shafts rotate following the deformation at the vertical joint, the self-resetting function of the energy dissipation member can effectively reduce the overall deformation of the structure; moreover, electromagnetic induction heating technology is used to process both ends of the energy dissipation element to improve the connection strength at the connection of both ends, so that a weakened section is formed at the middle position of the energy dissipation member, enabling the connection to be damaged at the middle position, effectively protecting the main structure, reducing the residual strain of the structure, and at the same time reducing the post-earthquake maintenance and reconstruction costs. At the same time, since both the left frame and the right frame have concave-shaped bending sections at the middle position, during an earthquake, when the left frame and the right frame are deformed at the vertical joint position, only vertical relative sliding occurs and no horizontal sliding occurs, effectively ensuring that the internal connection structure of the left frame and the right frame and the energy dissipation member do not bear excessive shear bearing capacity, and reducing the post-earthquake maintenance and reconstruction costs.

[0028] Compared with the prior art, the present invention has the following advantages: 1. For the connection method between the metal dampers set at the vertical joints of precast shear walls and the two side wall limbs, it is mostly a fixed connection form. When the two side shear walls on both sides of the vertical joint are subjected to extreme loads such as earthquakes, relative horizontal deformations occur in the two side wall limbs. The bending moment at the connection position of the metal damper at the vertical joint with the two side wall limbs is the largest, resulting in adverse loads concentrating at the connection with the two side wall limbs, so that the material properties of the metal damper cannot be fully utilized, and the energy dissipation capacity of the metal damper is reduced. Although there are control methods for adverse loads at present, such as setting weakening interfaces (such as X-shaped metal dampers), the problem that the adverse loads still concentrate at the end position of the metal damper has not been solved. The present invention proposes a rotational metal damper, by changing the fixed connection form on both sides of the metal damper to a hinged connection form, so as to achieve the release of the end constraint of the metal damper, thereby realizing the transfer of the adverse loads of the metal damper and the purpose of controlling the breaking point of the metal damper.

[0029] 2. The electromagnetic induction heating technology can achieve rapid and uniform heating. This heating method helps to optimize the internal structure of steel, thereby improving its strength. The present invention performs heat treatment on the round steel materials at both ends of the energy dissipation component through the electromagnetic induction heating technology, thereby improving the strength of the round steel materials at both ends, further improving the energy dissipation capacity of the rotational metal damper, and also making the middle of the energy dissipation component a weakened and destructible structure.

[0030] 3. The shape memory alloy (SMA) technology has been widely applied in the field of construction engineering at present. Its advantages are mainly reflected in its unique superelasticity, high damping property, and the characteristic that the elastic modulus changes with temperature. The present invention uses SMA round steel materials for the position of the energy dissipation component. Through the shape memory property of SMA, the damper has the self-resetting ability; through the superelasticity of SMA, the energy dissipation capacity of the damper is improved.

[0031] 4. A left frame and a right frame are arranged between the precast wall panels and used in cooperation with the energy dissipation component. Since there are concave-shaped bending sections at the middle positions of the left frame and the right frame, when the left frame and the right frame deform at the vertical joint position, only vertical relative sliding occurs and no horizontal sliding occurs, effectively ensuring that the internal connection structure and SMA of the left frame and the right frame will not bear excessive shear bearing capacity, reducing the post-earthquake maintenance and reconstruction costs, so as to achieve the purpose of restricting the relative horizontal displacement between the precast wall panels and ensuring the full play of the mechanical properties of the damper.

[0032] 5. Traditional metal dampers at the vertical joints of precast shear walls are usually connected by welding or other means. After an earthquake, relative deformation occurs between the two sides of the shear wall, which may cause damage to positions such as the welds of the traditional metal damper, making it impossible to disassemble or replace the traditional metal damper. Each component of the rotational metal damper proposed by the present invention is connected by threaded bolts, and the components of the damper can be replaced by disassembly after the earthquake, greatly improving the efficiency of post-earthquake repair work.

[0033] In the above description of this specification, unless otherwise clearly specified and defined, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, with respect to the term "connected", it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal communication of two components or the interaction relationship between two components. Therefore, unless otherwise clearly defined in this specification, those skilled in the art can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0034] According to the above description of this specification, those skilled in the art can also understand the following terms used, such as "upper", "lower", "front", "rear", "left", "right", "length", "width", "thickness", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", "center", "longitudinal", "transverse", "clockwise" or "counterclockwise", etc. Terms indicating orientation or position relationship are based on the orientation or position relationship shown in the drawings of this specification. They are only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or component involved must have the specific orientation, be constructed and operated in the specific orientation. Therefore, the above terms of orientation or position relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0035] In addition, the terms "first" or "second" etc. used in this specification to refer to numbers or ordinals are only for descriptive purposes and cannot be understood as explicitly or implicitly indicating relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this specification, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An assembled shear wall with a vertical joint connected by a rotational metal damper, comprising a left wall and a right wall. There is a vertical joint between the left wall and the right wall, and a metal damper is arranged in the vertical joint. It is characterized in that: The metal damper includes a left base fixed to the right side of the left wall and a right base fixed to the left side of the right wall. A left rotating shaft with a rotation axis extending in the front-rear direction is rotatably assembled on the left base, and a right rotating shaft with a rotation axis extending in the front-rear direction is rotatably assembled on the right base. The metal damper further includes an energy dissipation member made of shape memory alloy. One end of the energy dissipation member is fixedly connected to the left rotating shaft, and the other end of the energy dissipation member is fixedly connected to the right rotating shaft. A left frame is fixed on the left base, and a right frame is fixed on the right base. The left frame has a left front side plate and a right front side plate located on the front and rear sides of the energy dissipation member, and the right frame has a right front side plate and a right rear side plate located on the front and rear sides of the energy dissipation member. The left front side plate of the left frame and the right front side plate of the right frame are in guiding movement cooperation in the up-down direction through a front-side concave-convex matching structure; the left rear side plate of the left frame and the right rear side plate of the right frame are in guiding movement cooperation in the up-down direction through a rear-side concave-convex matching structure.

2. The prefabricated shear wall according to claim 1, characterized in that: There are two metal dampers, and the two metal dampers are arranged at intervals in the up-down direction.

3. The prefabricated shear wall according to claim 1, wherein: Both ends of the energy dissipation member are a left connection end and a right connection end that have been subjected to electromagnetic induction heating treatment, and the hardness of the left connection end and the hardness of the right connection end are greater than the hardness of the energy dissipation member between the left connection end and the right connection end.

4. The prefabricated shear wall according to claim 3, wherein: The left connection end is threadedly connected to the left rotating shaft, and the right connection end is threadedly connected to the right rotating shaft.

5. The prefabricated shear wall according to claim 1, wherein: A left installation groove is provided on the right side of the left wall, and the left base is pre-buried and fixed in the left installation groove; a right installation groove is provided on the left side of the right wall, and the right base is pre-buried and fixed in the right installation groove.

6. The prefabricated shear wall according to claim 1, wherein: The left front side plate and the left rear side plate of the left frame have first protrusions with opposite protrusion directions, and the right front side plate and the right rear side plate of the right frame have second protrusions with opposite protrusion directions. The first protrusions are disposed opposite to the inner sides of the second protrusions.

7. The prefabricated shear wall according to claim 6, characterized in that: A first long hole extending in the up-down direction is provided on the first protrusion, a second long hole corresponding to the first long hole is provided on the second protrusion, and a limit screw for restricting the up-down movement limit of the left frame relative to the right frame is inserted through the long holes of the two first protrusions and the two second protrusions.

8. The prefabricated shear wall according to any one of claims 1 to 7, characterized in that: A left first half groove is provided at the right end of the left base, a left semi-circular fastener is fixed to the right end of the left base by a bolt, the left semi-circular fastener has a left second half groove corresponding to the left first half groove, and the left rotating shaft is rotatably assembled between the left first half groove and the left second half groove; a right first half groove is provided at the left end of the right base, a right semi-circular fastener is fixed to the left end of the right base by a bolt, the right semi-circular fastener has a right second half groove corresponding to the right first half groove, and the right rotating shaft is rotatably assembled between the right first half groove and the right second half groove.

9. The prefabricated shear wall according to claim 8, characterized in that: The left frame further includes a left frame vertical plate connected to the left end of the front side plate and the rear side plate of the left frame. The left frame vertical plate is fixed to the left base by bolts, and a left avoidance groove for avoiding the left semi-circular fastener is provided on the left frame vertical plate; the right frame further includes a right frame vertical plate connected to the right end of the front side plate and the rear side plate of the right frame, and a right avoidance groove for avoiding the right semi-circular fastener is provided on the right frame vertical plate.

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