A seismic device for increasing lateral stiffness of a building and methods of use thereof

Abstract

The application discloses an anti-seismic device for increasing lateral rigidity of a building and a use method thereof, and belongs to the technical field of building anti-seismic technology. The anti-seismic device for increasing lateral rigidity of a building and the use method thereof comprise lateral shear walls, further comprise reinforcing plates, the reinforcing plates are provided at least in two, wedge-shaped blocks are arranged between the two reinforcing plates, and the two reinforcing plates are located between the two lateral shear walls. In order to solve the problem that it is difficult to utilize building horizontal components and improve the anti-seismic capability of the building without increasing the dead weight, two rotatable reinforcing plates are arranged between the two lateral shear walls in the building, the reinforcing plates are rotated to a horizontal state by a hydraulic cylinder before an earthquake, at this time, rooms above the reinforcing plates can be normally used, when the earthquake comes, the reinforcing plates are rotated to a vertical state by the hydraulic cylinder, the reinforcing plates and the lateral shear walls are combined into a whole, so that the lateral rigidity of the building is improved, and the anti-seismic capability of the building is further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building seismic resistance, in particular to an anti-seismic device for increasing lateral stiffness of a building and a use method thereof. BACKGROUND

[0002] Under the action of an earthquake, a super high-rise building is more damaged by a transverse wave than by a longitudinal wave. However, in the existing structure design, the lateral stiffness of the building is increased to achieve the purpose of seismic resistance by increasing lateral components (such as frame columns, shear walls, and cylinder components). However, such components usually have a large self-weight, which increases the seismic force acting on the building. Meanwhile, from the perspective of the building structure, the horizontal components have a small effect on resisting the earthquake in the horizontal direction of the building. Therefore, it is difficult to utilize the horizontal components of the building, and it is difficult to improve the seismic resistance of the building without increasing the self-weight. Therefore, the existing needs are not met. To solve the above problems, the present application provides an anti-seismic device for increasing lateral stiffness of a building and a use method thereof. SUMMARY

[0003] The present application aims to provide an anti-seismic device for increasing lateral stiffness of a building and a use method thereof. The device is characterized in that a rotatable reinforcing plate is arranged between two lateral shear walls in the building. Before an earthquake, the reinforcing plate is rotated to a horizontal state by a hydraulic cylinder. At this time, the rooms above the reinforcing plate can be normally used. When an earthquake occurs, the reinforcing plate is rotated to a vertical state by the hydraulic cylinder. At this time, the reinforcing plate and the lateral shear walls form an integral whole, thereby improving the lateral stiffness of the building and the seismic resistance of the building. The problems in the prior art can be solved.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: an anti-seismic device for increasing lateral stiffness of a building, comprising a lateral shear wall and a reinforcing plate. The reinforcing plate is arranged between the two lateral shear walls. The reinforcing plate is provided with a through hole in the inside and a rotating shaft on the side. The lateral shear wall is provided with a first receiving groove, a second receiving groove, and a pre-buried column on the side. The first receiving groove is provided with a hydraulic cylinder in the inside. The second receiving groove is provided with a bidirectional screw rod on one side. The two hydraulic cylinders below a single reinforcing plate are provided with a connecting rod.

[0005] Preferably, the reinforcing plate is provided with a sliding groove on the bottom. The sliding groove is provided with a guide column and a sliding block in the inside. The sliding block is mounted on the guide column. One end of the hydraulic cylinder is provided with a rotating seat. The other end of the hydraulic cylinder is provided with a jacking rod. The rotating seat is located in the first receiving groove. The rotating seat is connected with the lateral shear wall shaft. One end of the jacking rod is connected with the sliding block shaft.

[0006] Preferably, both ends of the connecting rod are provided with sleeves fixed on the hydraulic cylinder, the outer part of the connecting rod is provided with a transmission block connected with the connecting rod shaft, and the upper surface of the wedge-shaped block is wide and the lower surface of the wedge-shaped block is narrow.

[0007] Preferably, the bidirectional screw rod is connected with the lateral shear wall shaft, one end of the bidirectional screw rod is provided with a motor connected with the bidirectional screw rod shaft, the motor is fixed on the side of the lateral shear wall, and the outer part of the bidirectional screw rod is provided with a first limiting block, a second limiting block and a positioning block.

[0008] Preferably, the positioning block is located between the first limiting block and the second limiting block, the positioning block is connected with the bidirectional screw rod bearing, the first limiting block is connected with the left-hand thread wall of the bidirectional screw rod, the second limiting block is connected with the right-hand thread wall of the bidirectional screw rod, and one side of the first limiting block and the second limiting block is respectively provided with a first movable block and a second movable block.

[0009] Preferably, the first movable block is connected with the first limiting block shaft, the second movable block is connected with the second limiting block shaft, one side of the first movable block and the second movable block is respectively provided with a first supporting rod and a second supporting rod, both ends of the first supporting rod are respectively connected with the first movable block and the transmission block shaft, and both ends of the second supporting rod are respectively connected with the second movable block and the transmission block shaft.

[0010] An anti-seismic method for increasing lateral stiffness of a building is realized based on an anti-seismic device for increasing lateral stiffness of a building and comprises the following steps.

[0011] Step one, before the earthquake comes, the two reinforcing plates are in a horizontal state, the wedge-shaped block is clamped between the two reinforcing plates, when the earthquake comes, the earthquake warning light in the building is turned on and reminds personnel to leave the room above the reinforcing plate, and the human body presence sensor judges whether there is personnel in the room;

[0012] Step two, after the human body presence sensor judges that there is no personnel in the room, the hydraulic cylinder is started, the hydraulic cylinder first controls the jacking rod to extend, so that the two reinforcing plates rotate upwards around the rotating shaft, and then the wedge-shaped block is loosened and falls to the lower side of the reinforcing plate, and then the hydraulic cylinder controls the jacking rod to be recycled to the inside of the hydraulic cylinder, so that the two reinforcing plates rotate downwards around the rotating shaft until the jacking rod is completely recycled.

[0013] Step three, the motor is started, the motor rotates in the positive direction to drive the bidirectional screw rod to rotate, at this time, the first limiting block and the second limiting block move to the two ends of the bidirectional screw rod respectively, so that the included angle between the first supporting rod and the second supporting rod becomes larger, thereby driving the hydraulic cylinder to rotate around the rotating seat to the inside of the first storage slot, and the reinforcing plate rotates with the hydraulic cylinder.

[0014] Step four, when the hydraulic cylinder is fully recovered to the inside of the first storage slot, the reinforcing plate is in a vertical state, at this time the embedded column is inserted into the inside of the through hole, so that the reinforcing plate and the lateral shear wall form an integral whole, which can enhance the lateral stiffness of the building;

[0015] Step five, after the earthquake, the motor starts, the motor reverses, the first limit block and the second limit block move to the middle along the bidirectional screw rod at the same time, when the first limit block and the second limit block are in place, that is, the first limit block and the second limit block are in contact with the positioning block, the hydraulic cylinder rotates to the telescopic position;

[0016] Step six, the hydraulic cylinder starts, the hydraulic cylinder controls the jacking rod to extend, so that the reinforcing plate rotates again to the horizontal state with the rotating shaft as the center, after the two reinforcing plates are in the horizontal state, the personnel will wedge the wedge-shaped block between the two reinforcing plates, at this time the room above the two reinforcing plates can be normally used.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] 1、The present application sets up rotatable reinforcing plates on one side of two lateral shear walls in the building, before the earthquake, the hydraulic cylinder drives the reinforcing plate to rotate to the horizontal state, at this time one end of one reinforcing plate and one end of the other reinforcing plate are wedged by the wedge-shaped block, so that when the weight above the reinforcing plate presses down the reinforcing plate, the two reinforcing plates simultaneously extrude the wedge-shaped block, causing the reinforcing plate and the wedge-shaped block to be connected more tightly, thereby ensuring that the reinforcing plate is always in the horizontal state, ensuring that the room above the reinforcing plate can be normally used, when the earthquake comes, the hydraulic cylinder drives the reinforcing plate to rotate to the vertical state, at this time the reinforcing plate and the lateral shear wall form an integral whole, thereby improving the lateral stiffness of the building, after the earthquake, the motor drives the hydraulic cylinder to rotate to the telescopic position, the hydraulic cylinder controls the jacking rod to extend, the reinforcing plate rotates again to the horizontal state, so that the reinforcing plate can be reused, and can be converted between the room support structure and the auxiliary anti-seismic structure in daily life, reducing the anti-seismic cost of the building.

[0019] 2、The present application, when the earthquake comes, the hydraulic cylinder first controls the jacking rod to extend so that the reinforcing plate rotates upward, at this time the wedge-shaped block loosens and falls to the lower part of the reinforcing plate, then the jacking rod is recovered to the inside of the hydraulic cylinder, the reinforcing plate rotates downward, after the jacking rod is fully recovered, the motor drives the bidirectional screw rod to rotate, the first limit block and the second limit block move to the two ends of the bidirectional screw rod respectively, so that the included angle between the first support rod and the second support rod becomes larger, thereby driving the hydraulic cylinder to rotate to the inside of the first storage slot with the rotating base as the center, after the hydraulic cylinder is fully recovered to the inside of the first storage slot, the reinforcing plate is in a vertical state, at this time the embedded column is inserted into the inside of the through hole, the lower part of the reinforcing plate is fixed by the embedded column, the upper part of the reinforcing plate is fixed by the rotating shaft, so that the reinforcing plate and the lateral shear wall form an integral whole, which can improve the anti-seismic ability of the building. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall schematic view of the present application;

[0021] Figure 2 It is the partial structure schematic view of the hydraulic cylinder of the present application;

[0022] Figure 3 It is the partial structure schematic view of the lateral shear wall of the present application;

[0023] Figure 4 It is the partial structure schematic view of the bidirectional screw rod of the present application.

[0024] In the figure: 1, lateral shear wall; 101, embedded column; 102, first receiving groove; 103, second receiving groove; 2, reinforcing plate; 201, rotating shaft; 202, through hole; 203, sliding groove; 204, guide column; 205, sliding block; 3, wedge block; 4, hydraulic cylinder; 401, rotating seat; 402, sleeve; 403, jacking rod; 404, connecting rod; 5, bidirectional screw rod; 501, motor; 502, first limiting block; 503, first movable block; 504, first supporting rod; 505, second limiting block; 506, second movable block; 507, second supporting rod; 508, positioning block; 509, transmission block. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] In order to solve the problem that it is difficult to use building horizontal components and improve the building seismic capacity without increasing the self weight, please refer to Figures 1-4 The technical solutions of the present embodiment are as follows:

[0027] The anti-seismic device for increasing the lateral stiffness of a building comprises a lateral shear wall 1, and further comprises reinforcing plates 2, at least two reinforcing plates 2 are provided, a wedge block 3 is arranged between the two reinforcing plates 2, the two reinforcing plates 2 are located between two lateral shear walls 1, through holes 202 are arranged in the reinforcing plates 2, rotating shafts 201 are arranged on the sides of the reinforcing plates 2, first receiving grooves 102, second receiving grooves 103 and embedded columns 101 are arranged on the sides of the lateral shear walls 1, hydraulic cylinders 4 are arranged in the first receiving grooves 102, bidirectional screw rods 5 are arranged on one side of the second receiving grooves 103, and connecting rods 404 are arranged between the two hydraulic cylinders 4 below a single reinforcing plate 2.

[0028] The lower surface of the reinforcing plate 2 is provided with a sliding groove 203, the inside of the sliding groove 203 is provided with a guide column 204 and a sliding block 205, the sliding block 205 is installed on the guide column 204, one end of the hydraulic cylinder 4 is provided with a rotating seat 401, the other end of the hydraulic cylinder 4 is provided with a jacking rod 403, the rotating seat 401 is located in the inside of the first storage groove 102, the rotating seat 401 is connected with the lateral shear wall 1, one end of the jacking rod 403 is connected with the sliding block 205, both ends of the connecting rod 404 are provided with sleeves 402, the sleeves 402 are fixed on the hydraulic cylinder 4, the outside of the connecting rod 404 is provided with a transmission block 509, the transmission block 509 is connected with the connecting rod 404, the upper surface of the wedge-shaped block 3 is wide, and the lower surface of the wedge-shaped block 3 is narrow.

[0029] Specifically, after the hydraulic cylinder 4 drives the reinforcing plate 2 to rotate to the horizontal state, the one end of one reinforcing plate 2 and the one end of the other reinforcing plate 2 are wedged by the wedge-shaped block 3, so that when the weight above the reinforcing plate 2 presses down the reinforcing plate 2, the two reinforcing plates 2 simultaneously extrude the wedge-shaped block 3, causing the reinforcing plate 2 and the wedge-shaped block 3 to be more tightly connected, thereby ensuring that the reinforcing plate 2 is always in a horizontal state, and ensuring that the room above the reinforcing plate 2 can be normally used.

[0030] Specifically, the reinforcing plate 2 is in a horizontal state before the earthquake, after the earthquake, the motor 501 drives the hydraulic cylinder 4 to rotate to the telescopic position, then the hydraulic cylinder 4 controls the jacking rod 403 to extend, and the reinforcing plate 2 rotates to the horizontal state again, so that the reinforcing plate 2 can be reused, and can be converted between the room supporting structure and the auxiliary anti-seismic structure in daily life, further reducing the anti-seismic cost of the building.

[0031] The bidirectional screw rod 5 is connected with the lateral shear wall 1, one end of the bidirectional screw rod 5 is provided with a motor 501, the motor 501 is connected with the bidirectional screw rod 5, the motor 501 is fixed on the side surface of the lateral shear wall 1, the outside of the bidirectional screw rod 5 is provided with a first limiting block 502, a second limiting block 505 and a positioning block 508, the positioning block 508 is located between the first limiting block 502 and the second limiting block 505, the positioning block 508 is connected with the bidirectional screw rod 5 through bearing, the first limiting block 502 is connected with the left-hand thread wall of the bidirectional screw rod 5, the second limiting block 505 is connected with the right-hand thread wall of the bidirectional screw rod 5, one side of the first limiting block 502 and the second limiting block 505 is respectively provided with a first movable block 503 and a second movable block 506, the first movable block 503 is connected with the first limiting block 502 through shaft, the second movable block 506 is connected with the second limiting block 505 through shaft, one side of the first movable block 503 and the second movable block 506 is respectively provided with a first supporting rod 504 and a second supporting rod 507, both ends of the first supporting rod 504 are respectively connected with the first movable block 503 and the transmission block 509 through shaft, both ends of the second supporting rod 507 are respectively connected with the second movable block 506 and the transmission block 509 through shaft.

[0032] An anti-seismic method for increasing lateral stiffness of a building is realized based on an anti-seismic device for increasing lateral stiffness of a building, comprising the following steps:

[0033] Step one, before the earthquake, the two reinforcing plates 2 are in a horizontal state, the wedge-shaped block 3 is clamped between the two reinforcing plates 2, when the earthquake comes, the earthquake warning light in the building is on and reminds the personnel to leave the room above the reinforcing plate 2, and the human presence sensor judges whether there is personnel in the room;

[0034] Step two, after the human presence sensor judges that there is no personnel in the room, the hydraulic cylinder 4 is started, the hydraulic cylinder 4 first controls the jacking rod 403 to extend, so that the two reinforcing plates 2 rotate upward around the rotating shaft 201, and then the wedge-shaped block 3 is loosened and falls to the lower side of the reinforcing plate 2, and then the hydraulic cylinder 4 controls the jacking rod 403 to be retracted into the hydraulic cylinder 4, so that the two reinforcing plates 2 rotate downward around the rotating shaft 201 until the jacking rod 403 is completely retracted;

[0035] Step three, the motor 501 is started, the motor 501 rotates in the positive direction to drive the bidirectional screw rod 5 to rotate, at this time, the first limiting block 502 and the second limiting block 505 respectively move to the two ends of the bidirectional screw rod 5, so that the included angle between the first supporting rod 504 and the second supporting rod 507 becomes larger, thereby driving the hydraulic cylinder 4 to rotate around the rotating seat 401 to the inside of the first storage groove 102, and the reinforcing plate 2 rotates with the hydraulic cylinder 4;

[0036] Step four, when the hydraulic cylinder 4 is completely retracted into the inside of the first storage groove 102, the reinforcing plate 2 is in a vertical state, at this time, the embedded column 101 is inserted into the inside of the through hole 202, so that the reinforcing plate 2 and the lateral shear wall 1 form an integral whole, which can enhance the lateral stiffness of the building;

[0037] Step five, after the earthquake, the motor 501 is started, the motor 501 reverses, the first limiting block 502 and the second limiting block 505 simultaneously move to the middle along the bidirectional screw rod 5, when the first limiting block 502 and the second limiting block 505 are in place, that is, the first limiting block 502 and the second limiting block 505 are in contact with the positioning block 508, the hydraulic cylinder 4 rotates to the telescopic position;

[0038] Step six, the hydraulic cylinder 4 is started, the hydraulic cylinder 4 controls the jacking rod 403 to extend, so that the reinforcing plate 2 rotates again around the rotating shaft 201 to a horizontal state, after the two reinforcing plates 2 are in a horizontal state, the personnel clamps the wedge-shaped block 3 between the two reinforcing plates 2, at this time, the room above the two reinforcing plates 2 can be normally used.

[0039] Working principle: by setting the rotatable reinforcing plate 2 on one side of the two lateral shear walls 1 in the building, before the earthquake, the hydraulic cylinder 4 drives the reinforcing plate 2 to rotate to the horizontal state, when the earthquake comes, the hydraulic cylinder 4 drives the reinforcing plate 2 to rotate to the vertical state, at this time, the reinforcing plate 2 and the lateral shear wall 1 form a whole, thereby improving the lateral stiffness of the building, after the earthquake, the motor 501 drives the hydraulic cylinder 4 to rotate to the telescopic position, then the hydraulic cylinder 4 controls the jacking rod 403 to extend, the reinforcing plate 2 rotates to the horizontal state again, so that the reinforcing plate 2 can be reused, and can be converted between the room support structure and the auxiliary anti-seismic structure in daily life, reducing the anti-seismic cost of the building.

[0040] It should be noted that in this document, the terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0041] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A seismic device for increasing the lateral stiffness of a building, comprising a lateral shear wall (1), characterized in that: It also includes a reinforcing plate (2), wherein at least two reinforcing plates (2) are provided, a wedge block (3) is provided between the two reinforcing plates (2), the two reinforcing plates (2) are located between the two lateral shear walls (1), a through hole (202) is provided inside the reinforcing plate (2), a rotating shaft (201) is provided on the side of the reinforcing plate (2), a first receiving groove (102), a second receiving groove (103) and an embedded column (101) are provided on the side of the lateral shear wall (1), a hydraulic cylinder (4) is provided inside the first receiving groove (102), a bidirectional screw rod (5) is provided on one side of the second receiving groove (103), and a connecting rod (404) is provided between the two hydraulic cylinders (4) below the single reinforcing plate (2); A slide groove (203) is provided below the reinforcing plate (2), a guide column (204) and a slider (205) are provided inside the slide groove (203), the slider (205) is mounted on the guide column (204), a rotating seat (401) is provided at one end of the hydraulic cylinder (4), a lifting rod (403) is provided at the other end of the hydraulic cylinder (4), the rotating seat (401) is located inside the first receiving groove (102), the rotating seat (401) is connected to the axis of the lateral shear wall (1), and one end of the lifting rod (403) is connected to the axis of the slider (205); The bidirectional screw rod (5) is connected to the axis of the lateral shear wall (1), one end of the bidirectional screw rod (5) is provided with a motor (501), the motor (501) is connected to the axis of the bidirectional screw rod (5), the motor (501) is fixed to the side of the lateral shear wall (1), and the outside of the bidirectional screw rod (5) is provided with a first limit block (502), a second limit block (505) and a positioning block (508); the positioning block (508) is located between the first limit block (502) and the second limit block (505), the positioning block (508) is connected to the bearing of the bidirectional screw rod (5), the first limit block (502) is connected to the left-handed thread wall on the bidirectional screw rod (5), and the second limit block (505) is connected to the right-handed thread wall on the bidirectional screw rod (5). The first movable block (503) and the second movable block (506) are respectively provided on one side of the first limit block (502) and the second limit block (505); the first movable block (503) is axially connected to the first limit block (502), and the second movable block (506) is axially connected to the second limit block (505); a first support rod (504) and a second support rod (507) are respectively provided on one side of the first movable block (503) and the second movable block (506); two ends of the first support rod (504) are respectively axially connected to the first movable block (503) and the transmission block (509), and two ends of the second support rod (507) are respectively axially connected to the second movable block (506) and the transmission block (509).

2. The seismic device for increasing the lateral stiffness of a building according to claim 1, characterized in that: Both ends of the coupling rod (404) are provided with sleeves (402), which are fixed on the hydraulic cylinder (4). A transmission block (509) is provided on the outside of the coupling rod (404), and the transmission block (509) is connected to the axis of the coupling rod (404). The upper surface of the wedge block (3) is a wide opening, and the lower surface of the wedge block (3) is a narrow opening.

3. A method for increasing the lateral stiffness of a building, implemented based on the device for increasing the lateral stiffness of a building according to any one of claims 1 to 2, characterized in that: The following steps are involved: Step 1: Before an earthquake strikes, the two reinforcement plates (2) are both in a horizontal state, and the wedge-shaped block (3) is engaged between the two reinforcement plates (2). When an earthquake strikes, the earthquake warning light inside the building lights up and reminds people to leave the room above the reinforcement plate (2). At the same time, the human presence sensor determines whether there are people inside the room. Step 2: After the human presence sensor determines that there is no one in the room, the hydraulic cylinder (4) is started. The hydraulic cylinder (4) first controls the lifting rod (403) to extend, so that the two reinforcing plates (2) rotate upward with the rotating shaft (201) as the center, thereby loosening the wedge block (3) and dropping it below the reinforcing plate (2). Then, the hydraulic cylinder (4) controls the lifting rod (403) to be retracted into the interior of the hydraulic cylinder (4), so that the two reinforcing plates (2) rotate downward with the rotating shaft (201) as the center until the lifting rod (403) is completely retracted. Step 3: The motor (501) is started, and the motor (501) rotates forward to drive the bidirectional screw (5) to rotate. At this time, the first limit block (502) and the second limit block (505) move toward the two ends of the bidirectional screw (5), respectively, so that the angle between the first support rod (504) and the second support rod (507) becomes larger, thereby driving the hydraulic cylinder (4) to rotate toward the inside of the first receiving groove (102) with the rotating seat (401) as the center, and at the same time, the reinforcing plate (2) rotates along with the hydraulic cylinder (4); Step 4: After the hydraulic cylinder (4) is completely retracted into the interior of the first receiving groove (102), the reinforcing plate (2) is in a vertical state. At this time, the embedded column (101) is inserted into the interior of the through hole (202), so that the reinforcing plate (2) and the lateral shear wall (1) form a whole, which can enhance the lateral stiffness of the building; Step 5: After the earthquake ends, the motor (501) is started, the motor (501) is reversed, and the first limit block (502) and the second limit block (505) are simultaneously moved toward the middle along the bidirectional screw rod (5). When the first limit block (502) and the second limit block (505) are in place, that is, the first limit block (502) and the second limit block (505) are in contact with the positioning block (508), the hydraulic cylinder (4) rotates to the telescopic position; Step 6: The hydraulic cylinder (4) is started, and the hydraulic cylinder (4) controls the jacking rod (403) to extend, so that the reinforcing plate (2) is rotated to a horizontal state again with the rotating shaft (201) as the center. After the two reinforcing plates (2) are both in a horizontal state, the personnel then engage the wedge block (3) between the two reinforcing plates (2). At this time, the room above the two reinforcing plates (2) can be used normally.

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