Shear wall rear opening door hole pasting steel plate reinforcing structure and construction method

Abstract

The invention relates to a shear wall back-opening door hole pasting steel plate reinforcing structure and a construction method, and belongs to the technical field of shear wall reinforcing. Comprising vertical angle steel, long-strip-shaped steel plates, flat steel, horizontal angle steel and batten plates, the four vertical angle steel and the two long-strip-shaped steel plates are pasted and anchored on the shear wall in the outline direction of the rear door opening, the four vertical angle steel are arranged on the left side and the right side opposite to the rear door opening respectively, and the two long-strip-shaped steel plates are arranged on the flat steel. Gaps between the vertical angle steels on the same side of the front and back surfaces of the rear door opening are welded and reinforced by batten plates, so that the rear door opening is wrapped; the flat steel is pasted on the upper layer of the floor slab corresponding to the rear door opening, the horizontal angle steel is pasted on the lower layer of the floor slab, and the horizontal angle steel, the flat steel and the wall body are fixed through split bolts and chemical anchor bolts. The problems that the bearing capacity of the shear wall with the rear door opening is reduced, and the ductility and the shock resistance of the whole structure are improved are effectively solved.

Description

Technical Field

[0001] The invention relates to a door opening structure behind a shear wall, in particular to a steel plate-bonded door opening reinforcement structure behind a shear wall and a construction method, belonging to the technical field of shear wall reinforcement. Background Art

[0002] In recent years, with the rapid development of the domestic construction industry and the increasing demand for the use of housing buildings, shear wall structures need to have holes opened due to changes in the use functions of buildings.

[0003] However, there are a series of problems with opening a door behind a shear wall: Damage to the integrity of the wall: Shear walls are the main lateral force-resisting structural components in buildings. They can effectively resist horizontal wind loads and earthquakes. Opening a door in a shear wall will cut off the steel bars in the wall, destroying the continuity and integrity of the original structural system of the shear wall. For example, when an earthquake occurs, the shear wall needs to work in coordination to transmit and disperse the seismic force. Opening a door may cause the force transmission path to change, making the wall unable to effectively resist the seismic force, thereby increasing the risk of damage to the building in an earthquake.

[0004] Reduced wall bearing capacity: The bearing capacity of the shear wall is calculated based on its complete structural design. Opening a door will reduce the cross-sectional area of ​​the wall, causing the wall to bear vertical gravity loads (such as the building's own weight, floor live loads, etc.) and increase the stress per unit area. If the bearing capacity of the remaining part of the wall is exceeded, it may cause the wall to crack, deform, or even be damaged, thus affecting the stability of the entire building.

[0005] In summary, the opening of the shear wall reduces the cross-sectional size, resulting in a decrease in the bearing capacity of the shear wall, which greatly affects the shear wall's ability to bear horizontal and vertical loads, so reinforcement measures are needed.

[0006] At present, the rear opening technology of shear wall mainly includes: CN104179364A discloses a rear opening reinforcement structure of shear wall and its construction method, including the original wall, floor slab, and reinforcement steel frame. The steel frame is composed of angle steel and flat steel, which is wrapped around the edge of the door and window openings and fixed at the rear opening by anchor bolts and through-plate high-strength bolts. However, there are the following problems in this scheme: the short limbs of the angle steel extending from the redundant part need to be cut off, which not only increases the operation cost but also wastes the short limbs of the angle steel after the cut off; the scheme uses anchor bolts to fix and weld the angle steel to the steel bar, the operation process is complicated, and the welding connects the angle steel to the steel bar, which has no obvious effect on enhancing the bearing capacity, seismic performance and overall stability of the shear wall; the horizontal distribution steel bar is mainly used to bear the shear force, prevent the generation of oblique cracks in the shear wall structure, and effectively avoid brittle failure; the welding part of the angle steel and the steel bar is short, which cannot meet the conditions for the horizontal distribution steel bar to play a role, and has a poor effect on enhancing the overall performance of the shear wall.

[0007] Similarly, CN217841018U discloses a shear wall rear opening reinforcement structure, including: a first fixing frame, a second fixing frame, a first connecting plate, a first floor fixing piece and a second floor fixing piece; the first fixing frame and the second fixing frame are respectively suitable for being fixed on opposite sides of the opening of the shear wall, and the first floor fixing piece is suitable for being connected to the floor corresponding to the first fixing frame; the second floor fixing piece and the second fixing frame are respectively located on opposite sides of the floor corresponding to the second fixing frame, the first floor fixing piece is connected to the extension of the first fixing frame, one end of the second floor fixing piece is connected to the second fixing frame by penetrating the corresponding floor through an equal-generation through-plate screw, and the second floor fixing piece is connected to the extension of the first fixing frame and the first floor fixing piece by penetrating the shear wall through an equal-generation through-plate screw, so as to realize that the shear wall and the floors on both sides share the vertical and horizontal loads at the opening of the shear wall. However, this plan has the following problems: the floor slab with openings is reinforced together with the walls and floor slabs below it, which increases the number of reinforcement objects, prolongs the construction wet working time, and increases the deadweight of the structure after reinforcement, which may affect the building's usable space and the aesthetics of the walls; two layers need to be considered for unloading before reinforcement, which increases the amount of construction work.

[0008] The main research direction now is how to reinforce the door opening behind the shear wall and how to meet the usage requirements and satisfy the structural safety, integrity and applicability. Summary of the invention

[0009] In view of the above-mentioned defects of the above-mentioned prior art, the present invention proposes a shear wall rear door opening glued steel plate reinforcement structure and construction method to solve the problem of reduced bearing capacity of the shear wall with rear door opening and how to reinforce it.

[0010] In order to achieve the above object, the technical solution adopted by the present invention is as follows: The steel plate reinforcement structure of the rear door opening of the shear wall includes vertical angle steels, long strip steel plates, flat steels, horizontal angle steels and gusset plates, wherein four vertical angle steels and two long strip steel plates are pasted and anchored on the shear wall around the contour direction of the rear door opening, wherein the four vertical angle steels are respectively arranged on the left and right sides opposite to the rear door opening, and the gap between the vertical angle steels on the same side at the front and rear of the rear door opening is welded and reinforced by gusset plates, so as to form a wrapping of the rear door opening; the two long strip steel plates are respectively horizontally arranged at the front and rear sides of the shear wall above the rear door opening; wherein the two long strip steel plates are pasted and anchored on the wall of the shear wall, and the long strip steel plates at the front and rear sides are hooped together by U-shaped plates; The flat steel is pasted on the upper layer of the floor slab corresponding to the rear door opening, and the horizontal angle steel is pasted on the lower layer of the floor slab. The horizontal angle steel and the flat steel above the floor slab are connected and fixed together by tension bolts, and the horizontal angle steel and the wall below the floor slab are fixed by chemical anchor bolts; the horizontal angle steel and the flat steel together provide support for the floor slab below the rear door opening.

[0011] Furthermore, the gusset plates are plates connecting lattice column branches and placed in parallel at certain intervals, and the interval between the gusset plates is 200-300 mm.

[0012] Furthermore, the lengths of the four vertical angle steels are equal to the height of the rear door opening, and the lengths of the two long steel plates are greater than the width of the rear door opening by 30 cm on both sides.

[0013] Furthermore, the shear wall is a reinforced concrete shear wall.

[0014] The construction method of the above-mentioned shear wall rear opening and pasting steel plate reinforcement structure comprises the following steps: S1. First, clean and polish the shear wall surface. Use a hard wire brush and an air compressor to remove dust and slurry on the surface of the wall structure around the door opening. For hollow, peeling, honeycomb, corrosion and other concrete surfaces with large convex surfaces, the area should be flattened or chiseled off by hand, and the concave surface should be repaired and leveled with epoxy mortar; S2. Find the location of the steel bars at the rear door opening of the shear wall by the arrangement and quantity of the steel bars of the shear wall in the original design drawings, or by using a steel bar detector, and mark the location of the steel bars on the original shear wall corresponding to the rear door opening; S3. When drilling holes corresponding to anchor bolts with impact drills, ensure that the drill bit is perpendicular to the original shear wall structure surface and drill slowly to ensure the verticality of the holes. Set a scale on the impact drill to control the drilling depth. After drilling, use a wire brush or hard nylon brush to clean the dust around the hole, and then use a blower with high-pressure air to blow out the dust in the hole, so that the hole is finally clean and dry. S4. After the hole is cleaned, pour the chemical into the drilled hole and insert the anchor bolt. Stir the anchor bolt and the chemical by rotation to make it fully contact with the chemical. Wait for the chemical to solidify to form a chemical anchor bolt. S5. The adhesive used for pasting vertical angle steel and long steel plate should be prepared in strict accordance with the mix ratio specified in the product manual before use. Before applying the glue, clean the pasting surface of the vertical angle steel, long steel plate and the shear wall surface around the rear door opening to prevent the two pasting surfaces from being uneven after applying the glue. Confirm again that the anchor bolt position and the hole size of the vertical angle steel and long steel plate meet the installation requirements before applying the glue; finally, slowly install the glued vertical angle steel and long steel plate according to the method of pre-pasting, and finally tighten the chemical anchor bolt; S6. Repeat the above steps, and stick and anchor four vertical angle steels and two long steel plates on the shear wall around the contour direction of the rear door opening. Use gusset plates to weld and reinforce the gaps between the vertical angle steels on the same side at the front and back of the rear door opening to wrap the rear door opening; use U-shaped plates to clamp the two long steel plates and the top shear wall together; S7. Flat steel is pasted on the upper layer of the floor slab of the layer with the rear door opening, and horizontal angle steel is pasted on the lower layer of the floor slab. The horizontal angle steel and the flat steel are connected and fixed by tension bolts, and then the horizontal angle steel is fixed to the wall below the floor slab by chemical anchor bolts, so as to provide support for the floor slab below the rear door opening, further ensure the overall connection stability, and complete the reinforcement work.

[0015] Furthermore, in step S2, the final positioning of the anchor bolts should avoid the steel bars inside the original shear wall as much as possible to reduce damage to the original structure, ensure that the drilling is successful in one go, and avoid damage to the original components.

[0016] Furthermore, in step S5, when applying glue, the structural glue should be evenly applied to the vertical angle steel, the long steel plate and the surface of the shear wall around the rear door opening, and the thickness of the glue should be controlled at 2 to 3 mm; in addition, when gluing the steel, it is necessary to ensure that there is no gap between the vertical angle steel, the long steel plate and the shear wall.

[0017] Furthermore, after step S7, the following steps are also included: S8. After the reinforcement work is completed, the vertical angle steel, long steel plate, flat steel, horizontal angle steel and tie plate should be protected from external interference during the curing period, and the indoor environment should be kept at 20℃ and humid, and the room should be properly ventilated.

[0018] Furthermore, after step S8, the following steps are also included: S9. Acceptance after 48 hours and evenly apply fire-proof and anti-rust paint on the surface of vertical angle steel, long steel plate, flat steel, horizontal angle steel and tie plate to achieve the effect of protecting the steel plate and maintaining the performance of steel adhesive.

[0019] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art: The present invention can customize the reinforcement components according to the size of the opening before construction, and does not need to be processed on site. For example, there is no need to cut off the short limbs of the angle steel extending from the redundant part, which can save construction materials and improve material utilization.

[0020] In the present invention, the shear wall around the opening and the floor slab of the layer are reinforced, and the layer is unloaded before reinforcement, so the construction workload is small; the reinforcement measures are simple and effective, the construction period is short, and the impact on the aesthetics of the wall is small.

[0021] The U-shaped hoop in the present invention can effectively prevent the peeling failure between the angle steel and the concrete in the reinforced shear wall, ensuring that the flat steel and the concrete work together. The gusset plate can also effectively prevent the peeling failure. The interval arrangement of the gusset plates can enhance the ductility of the angle steel and increase the contact area between the wall and the angle steel when the shear wall is bent and deformed, thereby improving the ductility and earthquake resistance of the overall structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the reinforcement structure of the shear wall with a steel plate pasted on the rear door opening of the present invention; Figure 2 The invention is a flow chart of a construction method for reinforcing a structure by pasting a steel plate to open a door hole behind a shear wall. DETAILED DESCRIPTION

[0023] The following is combined with Figure 1-2 The present invention is further described in detail with specific implementations to facilitate a clear understanding of the present invention, but they do not constitute a limitation on the present invention.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, 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 an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1 As attached Figure 1 As shown, a steel plate reinforcement structure for a rear door opening of a shear wall in this embodiment includes a vertical angle steel 1, a long steel plate 2, a flat steel 7, a horizontal angle steel 11 and a gusset plate 4, wherein the shear wall 10 is a reinforced concrete shear wall, and four vertical angle steels 1 and two long steel plates 2 are pasted and anchored on the shear wall 10 around the contour direction of the rear door opening 3, wherein the four vertical angle steels 1 are respectively arranged on the opposite left and right sides of the rear door opening 3, and the gap between the vertical angle steels 1 on the same side in front and back of the rear door opening 3 is welded and reinforced by the gusset plate 4, so as to form a wrapping of the rear door opening 3. The two long steel plates 2 are respectively horizontally arranged on the front and rear sides of the shear wall 10 above the rear door opening 3. Among them, the two long steel plates 2 are pasted and anchored on the wall of the shear wall 10, and the long steel plates 2 on the front and rear sides are hooped together by a U-shaped plate 5.

[0027] Flat steel 7 is pasted on the upper layer of the floor slab 6 corresponding to the rear door opening 3, and horizontal angle steel 11 is pasted on the lower layer of the floor slab 6. The horizontal angle steel 11 is connected and fixed to the flat steel 7 above the floor slab 6 by tension bolts 8, and the horizontal angle steel 11 is fixed to the wall below the floor slab 6 by chemical anchor bolts 9. The horizontal angle steel 11 and the flat steel 7 together provide support for the floor slab 6 below the rear door opening 3.

[0028] In this embodiment, the gusset plates 4 are plates connected to the lattice column branches and are placed in parallel at a certain interval, and the interval between the gusset plates 4 is 280 mm. The length of the four vertical angle steels 1 is equal to the height of the rear door opening 3, and the length of the two long steel plates 2 is greater than the width of the rear door opening 3 by 30 cm on both sides.

[0029] Example 2 The construction method of the shear wall of the above-mentioned embodiment 1 is to open a door hole behind the shear wall and paste a steel plate to strengthen the structure. Figure 2 As shown, the following steps are included: S1. First, clean and polish the surface of the shear wall 10, and use a hard wire brush and an air compressor to remove the dust and slurry on the surface of the wall structure around the rear door opening 3. For concrete surfaces with hollowing, peeling, honeycombing, corrosion, etc. and large convex surfaces, the area should be flattened or chiseled off with a hand hammer, and the concave surface should be repaired and leveled with epoxy mortar.

[0030] S2. Find the steel bar position of the rear door opening of the shear wall 10 by the arrangement and quantity of the steel bars of the shear wall 10 in the original design drawings, or use a steel bar detector, and mark the steel bar position on the original shear wall 10 corresponding to the rear door opening. The final positioning of the anchor bolts should avoid the steel bars inside the original shear wall as much as possible to reduce damage to the original structure, ensure that the drilling is successful at one time, and avoid damage to the original components.

[0031] S3. When drilling holes corresponding to anchor bolts with impact drills, ensure that the drill bit is perpendicular to the original shear wall structure surface and drill slowly to ensure the verticality of the holes. Set a scale on the impact drill to control the drilling depth. After drilling, use a wire brush or hard nylon brush to clean the dust around the hole, and then use a blower with high-pressure air to blow out the dust in the hole, so that the hole is finally clean and dry.

[0032] S4. After the hole is cleaned, the chemical is poured into the drilled hole and the anchor bolt is inserted. The anchor bolt is fully contacted with the chemical by rotating and stirring, and the chemical is waited for to solidify to form a chemical anchor bolt 9.

[0033] S5. The adhesive used for pasting the vertical angle steel 1 and the long strip steel plate 2 should be prepared in strict accordance with the mix ratio specified in the product manual before use. Before applying the glue, clean the pasting surface of the vertical angle steel 1, the long strip steel plate 2 and the shear wall surface around the rear door opening 3, and pre-paste to prevent the two bonding surfaces from being uneven after applying the glue. Confirm again that the anchor bolt position and the hole size of the vertical angle steel 1 and the long strip steel plate 2 meet the installation requirements before applying the glue. Finally, slowly install the glued vertical angle steel 1 and the long strip steel plate 2 according to the method of pre-pasting, and finally tighten the chemical anchor bolt 9. When applying the glue, the structural glue should be evenly applied to the vertical angle steel 1, the long strip steel plate 2 and the shear wall surface around the rear door opening 3, and the thickness of the glue should be controlled at 2 to 3 mm. In addition, when pasting the steel, it is necessary to ensure that there is no gap between the vertical angle steel 1, the long strip steel plate 2 and the shear wall.

[0034] S6. Repeat the above steps, and stick and anchor four vertical angle steels 1 and two long steel plates 2 on the shear wall 10 around the contour direction of the rear door opening 3. The gaps between the vertical angle steels 1 on the same side of the front and rear sides of the rear door opening 3 are reinforced by welding 4 to form a wrap around the rear door opening 3. The two long steel plates 2 and the top shear wall are clamped together by using a U-shaped plate 5.

[0035] S7. Flat steel 7 is pasted on the upper layer of the floor slab 6 of the layer with the rear door opening 3, and horizontal angle steel 11 is pasted on the lower layer of the floor slab 6. The horizontal angle steel 11 and the flat steel 7 are connected and fixed by tension bolts 8, and then the horizontal angle steel 11 is fixed to the wall below the floor slab 6 by chemical anchor bolts 9, which provides support for the floor slab below the rear door opening 3, further ensures the overall connection stability, and completes the reinforcement work.

[0036] S8. After the reinforcement work is completed, the vertical angle steel 1, the long steel plate 2, the flat steel 7, the horizontal angle steel 11 and the gusset plate 4 should be protected from external interference during the curing period, and the indoor environment should be kept at 20℃ and humid, and the room should be properly ventilated.

[0037] S9. Acceptance after 48h and evenly apply fire-proof and anti-rust paint on the surface of vertical angle steel 1, long steel plate 2, flat steel 7, horizontal angle steel 11 and tie plate 4 to achieve the effect of protecting the steel plate and maintaining the performance of steel adhesive.

[0038] The above is only a preferred embodiment of the present invention, and does not impose any formal limitation on the structure of the present invention. The layout type and the number of uses of the present invention are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the present invention that does not deviate from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. The door opening behind the shear wall is pasted with a steel plate to strengthen the structure, which is characterized by: It comprises vertical angle steels (1), long strip steel plates (2), flat steels (7), horizontal angle steels (11) and gusset plates (4), wherein four vertical angle steels (1) and two long strip steel plates (2) are glued and anchored on the shear wall (10) around the outline direction of the rear door opening (3), wherein the four vertical angle steels (1) are respectively arranged on the opposite left and right sides of the rear door opening (3), and the gaps between the vertical angle steels (1) on the same side at the front and rear of the rear door opening (3) are welded and reinforced by gusset plates (4), so as to form a wrap around the rear door opening (3); the two long strip steel plates (2) are respectively horizontally arranged on the front and rear sides of the shear wall (10) above the rear door opening (3); wherein the two long strip steel plates (2) are glued and anchored on the wall of the shear wall (10), and the long strip steel plates (2) on the front and rear sides are hooped together by U-shaped plates (5); The flat steel (7) is pasted on the upper layer of the floor slab (6) corresponding to the rear door opening (3), and the horizontal angle steel (11) is pasted on the lower layer of the floor slab (6). The horizontal angle steel (11) and the flat steel (7) above the floor slab (6) are connected and fixed together by tension bolts (8), and the horizontal angle steel (11) and the wall below the floor slab (6) are fixed by chemical anchor bolts (9); the horizontal angle steel (11) and the flat steel (7) together provide support for the floor slab (6) below the rear door opening (3).

2. The steel plate reinforcement structure for the rear door opening of the shear wall according to claim 1 is characterized in that: The gusset plates (4) are plates that are placed in parallel at regular intervals and connect the limbs of the lattice columns. The interval between the gusset plates (4) is 200-300 mm.

3. The steel plate reinforcement structure for the rear door opening of the shear wall according to claim 1 is characterized in that: The lengths of the four vertical angle steels (1) are equal to the height of the rear door opening (3), and the lengths of the two long strip steel plates (2) are greater than the width of the rear door opening (3) by 30 cm on both sides.

4. The steel plate reinforcement structure for the rear door opening of the shear wall according to claim 1 is characterized in that: The shear wall (10) is a reinforced concrete shear wall.

5. A construction method for reinforcing a structure by gluing a steel plate to a rear door opening of a shear wall according to any one of claims 1 to 4, characterized in that: The steps include: S1. First, clean and polish the surface of the shear wall (10). Use a hard wire brush and an air compressor to remove dust and slurry on the surface of the wall structure around the rear door opening (3). For concrete surfaces with hollows, peeling, honeycombs, corrosion, and large convex surfaces, the area should be flattened or chiseled off with a hand hammer, and concave surfaces should be repaired and leveled with epoxy mortar. S2. Find the steel bar position of the rear door opening of the shear wall (10) by the arrangement and quantity of the steel bars of the shear wall (10) in the original design drawing, or use a steel bar detector to find the steel bar position, and mark the steel bar position on the original shear wall (10) corresponding to the rear door opening; S3. When drilling holes corresponding to anchor bolts with impact drills, ensure that the drill bit is perpendicular to the original shear wall structure surface and drill slowly to ensure the verticality of the holes. Set a scale on the impact drill to control the drilling depth. After drilling, use a wire brush or hard nylon brush to clean the dust around the hole, and then use a blower with high-pressure air to blow out the dust in the hole, so that the hole is finally clean and dry. S4. After the hole is cleaned, the chemical is poured into the drilled hole and the anchor bolt is inserted. The anchor bolt is fully contacted with the chemical by rotating and stirring, and the chemical is allowed to solidify to form a chemical anchor bolt (9). S5. The adhesive used for bonding the vertical angle steel (1) and the long strip steel plate (2) should be prepared in strict accordance with the mix ratio specified in the product manual before use. Before applying the glue, the bonding surfaces of the vertical angle steel (1), the long strip steel plate (2) and the shear wall surrounding the rear door opening (3) should be cleaned and pre-bonded to prevent the two bonding surfaces from being uneven after gluing. The glue can only be applied after confirming that the anchor bolt position and the hole size of the vertical angle steel (1) and the long strip steel plate (2) meet the installation requirements. Finally, the glued vertical angle steel (1) and the long strip steel plate (2) should be slowly installed according to the method used for pre-bonding, and finally the chemical anchor bolt (9) should be tightened. S6. Repeat the above steps, and stick and anchor four vertical angle steels (1) and two long steel plates (2) on the shear wall (10) around the contour direction of the rear door opening (3). The gaps between the vertical angle steels (1) on the same side of the front and rear sides of the rear door opening (3) are reinforced by welding (4) the gusset plates to form a wrap around the rear door opening (3); the two long steel plates (2) and the top shear wall are clamped together by using a U-shaped plate (5); S7. A flat steel (7) is pasted on the upper layer of the floor slab (6) at the layer of the rear door opening (3), and a horizontal angle steel (11) is pasted on the lower layer of the floor slab (6). The horizontal angle steel (11) and the flat steel (7) are connected and fixed by tension bolts (8), and then the horizontal angle steel (11) is fixed to the wall below the floor slab (6) by chemical anchor bolts (9), thereby providing support for the floor slab below the rear door opening (3), further ensuring the overall connection stability, and completing the reinforcement work.

6. The construction method according to claim 5, characterized in that: In step S2, the final positioning of the anchor bolts should avoid the steel bars inside the original shear wall as much as possible to reduce damage to the original structure, ensure that the drilling is successful at one time, and avoid damage to the original components.

7. The construction method according to claim 5, characterized in that: In the step S5, when applying the glue, the structural glue should be evenly applied to the vertical angle steel (1), the long strip steel plate (2) and the surface of the shear wall around the rear door opening (3), and the thickness of the glue should be controlled to be 2 to 3 mm; in addition, when gluing the steel, it is necessary to ensure that there is no gap between the vertical angle steel (1), the long strip steel plate (2) and the shear wall.

8. The construction method according to claim 5, characterized in that: After step S7, the following steps are also included: S8. After the reinforcement work is completed, the vertical angle steel (1), the long steel plate (2), the flat steel (7), the horizontal angle steel (11) and the tie plate (4) should be protected from external forces during the curing period. The indoor environment should be kept at 20°C and humid, and the room should be properly ventilated.

9. The construction method according to claim 8, characterized in that: After step S8, the following steps are also included: S9. Acceptance after 48 hours and evenly apply fireproof and anti-rust paint on the surface of vertical angle steel (1), long steel plate (2), flat steel (7), horizontal angle steel (11) and tie plate (4) to achieve the effect of protecting the steel plate and maintaining the performance of the steel adhesive.

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