Construction method for external wall panel joint of prefabricated sandwich heat-preservation shear wall

Abstract

The invention relates to the technical field of slab joint construction methods, and discloses a construction method for prefabricated sandwich heat preservation shear wall external wall slab joints. Comprising the steps of external wall panel hoisting, external wall panel grouting, slab joint base surface treatment, component base layer damage repairing, slab joint width repairing, backing material filling, masking paper pasting, primer coating liquid brushing, sealant construction, drainage pipe placing, glue surface repairing, masking paper removing, slab joint part plastering and net hanging and external wall coating construction. The construction method includes the steps of external wall panel hoisting, external wall panel grouting, slab joint base surface treatment, component base layer damage repairing, slab joint width repairing, backing material filling, masking paper pasting, primer coating liquid brushing, sealant construction, drainage pipe placing, sealant surface repairing and external wall coating construction. According to the construction method of the prefabricated sandwich heat preservation shear wall external wall panel joint, through multiple procedures of cleaning of the inner side of the reinforcing panel joint and control and repair of the width of the reinforcing panel joint, the sealant construction requirement is met, effective bonding of the sealant and a peripheral concrete base layer is facilitated, and the construction efficiency is improved. The sealant at the slab joint part is effectively prevented from being separated from a concrete base layer, a glue joint is prevented from cracking, and a facing layer is prevented from cracking and falling off, so that the beneficial effects of meticulous and normative effects are achieved in the aspects of cleaning the inner side of the slab joint, controlling the width of the slab joint and controlling the filling depth of a backing material.

Description

Technical Field

[0001] The invention relates to the technical field of plate seam construction methods, in particular to a construction method for a prefabricated sandwich insulation shear wall exterior plate seam. Background Art

[0002] With the full promotion of prefabricated buildings, the exterior wall decoration layer of prefabricated sandwich insulation shear wall usually adopts the plaster-free process. Therefore, the leakage of board joints and cracking and falling of exterior wall paint caused by improper treatment of horizontal and vertical joints of exterior wall panels are common, which seriously affects the durability, use function and appearance quality of the house.

[0003] The above-mentioned quality problems mainly arise because of the non-standard treatment of board seams by traditional construction technology. On the one hand, during the process of sealing the board seams, the base treatment conditions, board seam width and depth that meet the requirements of board seam gluing are not provided, resulting in the waterproof sealant failing to form an effective bond with the base concrete structure and causing leakage at the board seams, which directly affects the durability and use function of the building. On the other hand, before the construction of the exterior wall decoration materials, the crack-resistant mortar and alkali-resistant glass fiber mesh cloth were not added between the weather-resistant glue and the coating layer at the board seams to improve the coating base changes caused by thermal expansion and contraction of the waterproof sealant at the board seams, which caused the coating layer at the board seams to crack or even fall off, directly affecting the visual quality of the exterior wall. Summary of the invention

[0004] The object of the present invention is to provide a construction method for the seams of the exterior wall panels of a prefabricated sandwich insulation shear wall, so as to solve the problems raised in the above-mentioned background technology.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: A construction method for the seam of a prefabricated sandwich insulation shear wall exterior wall panel, comprising the following steps: S1: hoisting the exterior wall panel, using a crane to hoist the prefabricated exterior wall panel to a designated position, ensuring that the gap between the panels is uniform; S2: Grouting of exterior wall panels, pouring high-strength grouting material into the gaps between panels and between panels and the main structure to ensure a firm connection; S3: Process the base surface of the board seams, clean the dust and debris in the board seams, and ensure that the base surface is clean and flat; S4: Repair the damaged base of the components. Check whether the components around the plate joints are damaged. If damaged, repair them to ensure the integrity of the base surface. S5: Repair the width of the board seam. If the width of the board seam is inconsistent, it needs to be adjusted to ensure that the width of the board seam is uniform; S6: Fill the backing material. Fill the backing material (such as polyethylene foam strips) in the board joints to prevent excessive loss of sealant; S7: Paste masking tape on both sides of the board seam to prevent the sealant from overflowing and contaminating the wall surface. The masking tape should be attached tightly and straight to ensure the construction quality; S8: Apply primer on both sides of the board joint to enhance the adhesion of the sealant. The primer should be applied evenly to avoid omissions. S9: Apply sealant, use a sealant gun to evenly apply sealant in the board seams, the sealant should fill the board seams to ensure the sealing effect; S10: Install the drainage pipe at the bottom of the board seam to ensure that rainwater can be discharged smoothly. The drainage pipe should be installed firmly to avoid looseness; S11: Repair the sealant surface. Use special tools to repair the sealant surface to make it flat and smooth, and ensure that there are no bubbles or cracks on the sealant surface. S12: Remove the masking tape. After the sealant is cured, carefully tear off the masking tape to ensure that the edges of the sealant are neat and there is no residual masking tape. S13: Apply mortar and hang mesh on the board joints. Apply mortar and lay steel wire mesh or glass fiber mesh on the board joints. The mortar and mesh should be applied evenly and smoothly to ensure the stability and durability of the structure. S14: Exterior wall paint construction. After completing all the above steps, paint the exterior wall. The paint should be applied evenly to ensure the beauty and protective effect of the exterior wall.

[0006] As a preferred embodiment, in the S2 exterior wall panel grouting step, a temporary sealing material (such as a wooden wedge, a rubber strip, etc.) is used to seal the bottom of the panel joint to prevent the grouting material from flowing out from the bottom, and a grouting port is provided at the upper part of the panel joint to ensure that the grouting material can smoothly enter the panel joint. A grouting pump or manual method is used to slowly inject the grouting material from the bottom of the panel joint until the grouting material overflows from the top. During the grouting process, a small hammer is used to gently tap around the panel joint to help expel air and ensure that the grouting material is fully filled.

[0007] The beneficial effects of adopting the above further scheme are: the grouting of the exterior wall panels can not only enhance the stability and waterproof performance of the structure, but also improve the durability, thermal insulation and earthquake resistance of the exterior wall, improve the appearance quality, improve the construction efficiency, and have the advantages of environmental protection and energy saving. These beneficial effects make the grouting of the exterior wall panels an important part of the construction of prefabricated sandwich insulation shear wall exterior wall panels As a preferred implementation, in the step of repairing the damaged base layer of the S4 component, apply the first layer, and use a trowel or scraper to evenly apply the repair material to the damaged part with a thickness of about 1-2 mm. If the damage is deeper, it can be applied in layers, with each layer not exceeding 2 mm in thickness. Apply the next layer after the previous layer of material has initially solidified. Finally, use a trowel or scraper to compact the repair material to ensure a smooth surface without bubbles.

[0008] The beneficial effect of adopting the above further scheme is that the repair of damaged component base can not only ensure the construction quality, improve the structural stability and waterproof performance, but also improve the thermal insulation performance and appearance quality, improve the construction efficiency, and at the same time has the advantages of environmental protection and energy saving.

[0009] As a preferred implementation, in the S5 board seam width repair step, measure the actual width, use a tape measure or ruler to measure the actual width of the board seam, record the data, compare with the design requirements, compare the actual measured width with the design requirements, and determine whether adjustment is needed. When the board seam is too wide, use filling materials such as foamed polyurethane or polyethylene foam strips to fill the board seam to the designed width. If the board seam is wider, it can be filled in layers, and the thickness of each layer should not exceed 20 mm. Ensure that the filling material is compacted. Use a scraper or trowel to compact the filling material to ensure that the surface is flat and free of bubbles. When the board seam is too narrow, if the board seam is too narrow, the board seam width can be adjusted by fine-tuning the position of the exterior wall panel. Use a jack or hand tool to gently adjust the position of the panel until the designed width is reached. After the adjustment is completed, re-fix the exterior wall panel to ensure that its position is accurate.

[0010] The beneficial effects of adopting the above further scheme are: repairing the width of the board seams can ensure the construction quality, improve the structural stability and waterproof performance, improve the thermal insulation performance and appearance quality, improve the construction efficiency, and at the same time have the advantages of environmental protection and energy saving.

[0011] As a preferred embodiment, in the step S6 of filling the backing material, when cutting the backing material, first use scissors to cut out the backing material of appropriate length according to the length of the board seam, and then cut out the backing material of appropriate width according to the width of the board seam. Usually, the width of the backing material should be about 2-3 mm smaller than the width of the board seam to ensure that it can be easily inserted into the board seam. Then, gently insert the cut backing material into the board seam to ensure that it is located in the middle of the board seam. Finally, use a compression tool (such as a wooden stick, an iron rod, etc.) to gently compress the backing material so that it is close to both sides of the board seam, but do not over-compress it to avoid affecting the filling effect of the sealant. Finally, adjust the position to ensure that the position of the backing material in the board seam is even and not skewed.

[0012] The beneficial effects of adopting the above further scheme are: filling the backing material can reduce the amount of sealant used, improve the sealing effect and waterproof performance, and also improve durability, construction quality and appearance quality, simplify the construction process, and at the same time have the advantages of environmental protection and energy saving.

[0013] As a preferred embodiment, in the step of pasting the masking tape in S7, if the construction is carried out in a cold environment, the surface can be preheated appropriately to improve the bonding effect. Starting from a corner or edge, one end of the masking tape is pasted on the surface to ensure that the starting point fits tightly. Use your fingers or a scraper to gradually flatten the masking tape from the starting point to the other end to expel bubbles and ensure that each section fits tightly. Use a plastic scraper or special tool to scrape the masking tape from the middle to the edge to ensure that the entire surface fits tightly and there are no bubbles. Press gently at the edges of the masking tape, especially at corners and seams, to ensure that the edges fit tightly.

[0014] The beneficial effect of adopting the above further scheme is that the masking tape can effectively protect the construction surface and prevent materials such as coatings, paints, sealants, etc. from contaminating or damaging the substrate. When applying paint or sealant, the masking tape can prevent the material from penetrating into areas where it should not be applied, thereby ensuring the construction quality. After the construction is completed, the masking tape can be easily torn off without leaving any residual glue, which facilitates subsequent cleaning work.

[0015] As a preferred embodiment, in the step of applying the primer liquid in S8, avoid contamination. After applying the primer liquid, avoid performing operations that may contaminate the primer liquid near the board seams. Mark the painting area to remind subsequent construction personnel to pay attention to protection. Select a suitable primer liquid according to the base surface material and the construction environment to ensure that it has good compatibility with the base surface and the sealant. When applying the primer liquid, avoid excessive application to avoid wasting materials and affecting subsequent construction. Before applying the primer liquid, ensure that the base surface is clean, flat, free of cracks and looseness to avoid secondary damage. During the process of applying the primer liquid, avoid causing secondary damage to the surrounding base surfaces. Spray with a spray gun at a speed of about 2.0-4.0 square meters / minute. The specific speed depends on the pressure of the spray gun and the size of the nozzle. Keep the distance between the spray gun and the substrate moderate (generally 15-30 cm). Move the spray gun evenly to avoid local excessive thickness or thinness.

[0016] The beneficial effect of adopting the above further scheme is that applying the primer liquid can not only enhance the adhesion between the sealant and the base surface, improve the waterproof performance and durability, but also improve the base surface conditions, improve the construction quality and efficiency, and at the same time has the advantages of environmental protection and energy saving.

[0017] As a preferred implementation manner, in the S9 sealant construction step, starting from one end of the board seam, use a sealant gun to evenly inject the sealant into the board seam, keep the sealant gun in continuous motion, ensure that the sealant is evenly and continuously injected into the board seam, avoid bubbles and voids, ensure that the sealant fills the bottom of the board seam until the sealant overflows from the other end of the board seam, use a scraper to scrape the sealant flat, ensure that the surface of the sealant is flat and smooth, remove bubbles, and during the scraping process, gently press with a scraper to remove bubbles in the sealant, and finally trim the edges to ensure that the edges of the sealant are aligned with the masking tape on both sides of the board seam, and the edges are neat and beautiful.

[0018] The beneficial effects of adopting the above further scheme are: the construction sealant can enhance the waterproof performance and structural stability, improve the thermal insulation performance and durability, improve the appearance quality, simplify the construction process, and at the same time have multiple advantages such as environmental protection and energy saving, dust and pollution prevention, insect and mildew resistance, etc.

[0019] As a preferred embodiment, in the step of placing the drain pipe in S10, a suitable position is selected. According to the length and position of the plate seam, a suitable position for placing the drain pipe is selected. The drain pipe is usually set at the lowest point of the plate seam or a place where water is easily accumulated. The installation position of the drain pipe is marked on the plate seam with a pen or a marker. A drilling tool is used to drill a hole at the marked position. The hole diameter should be slightly smaller than the outer diameter of the drain pipe to ensure that the drain pipe can be securely installed. Then, a cleaning cloth or a brush is used to clean the dust and debris in the drill hole to ensure that the hole is clean. After cleaning, the drain pipe is cut with scissors according to the required length. The cut drain pipe is inserted into the drill hole to ensure that the lower end of the drain pipe extends out of the plate seam by a certain distance so that water can be discharged smoothly. The drain pipe is fixed in the hole with tape or sealant to ensure that it is firm and not loose. Then, sealant is applied. An appropriate amount of sealant is applied to the interface between the drain pipe and the hole to ensure that the interface is well sealed to prevent water from penetrating. After applying the sealant, the sealing effect of the interface is checked to ensure that there is no leakage.

[0020] The beneficial effects of adopting the above further scheme are: placing drain pipes can prevent moisture accumulation, improve waterproof performance and structural stability, extend service life, improve thermal insulation performance and appearance quality, simplify construction procedures, and at the same time have multiple advantages such as environmental protection, energy saving, insect prevention and mildew resistance.

[0021] Compared with the prior art, the beneficial effects achieved by the present invention are: First, the present invention strengthens the cleaning of the inside of the plate seam, strengthens the control and repair of the plate seam width, and meets the requirements of sealant construction through multiple working procedures, which is beneficial to the effective bonding of the sealant and the surrounding concrete base, and effectively prevents the sealant in the plate seam from being separated from the concrete base, the cracking of the sealant seam, and the cracking and falling of the finishing layer, so as to achieve meticulous and standardized beneficial effects in cleaning the inside of the plate seam, controlling the plate seam width and the filling depth of the backing material.

[0022] Second, the present invention arranges drainage pipes at the cross-plate seams of every three layers through a new technical solution. On the one hand, it can prevent water accumulation in the plate seams and the inside of the insulation layer due to leakage from the wall and the glue seams, as well as condensation water generated in the cavity due to inconsistent internal and external temperatures. When water accumulates in the insulation layer and the plate seams of the sandwich insulation board wall, it can be smoothly discharged, thereby avoiding leakage on the inside of the exterior wall and ensuring the durability and use function of the building; on the other hand, after the sealant construction is completed, the pressure difference between the inside and outside of the glue seam will cause the plate seam sealant to bulge or recess, thereby affecting the visual quality of the exterior facade, and in severe cases it may even cause the exterior wall real stone paint to crack or fall off. The drainage pipes arranged in the new technical solution can also play a venting role, which can balance the pressure difference between the inside and outside of the sealant, effectively avoiding the deformation of the sealant in the plate seams, and achieving the beneficial effect of the visual quality of the exterior facade.

[0023] Third, the present invention uses a new technical solution to add a polymer waterproof and crack-resistant mortar between the weather-resistant sealant and the coating layer after the construction of the board seam sealant is completed. Two layers of alkali-resistant glass fiber mesh cloth are pressed in during the mortar painting process. It is necessary to ensure that the mesh cloth is not exposed to resist the deformation of the board seam sealant, effectively preventing the cracking and falling off of the exterior wall real stone paint at the board seam position, ensuring the visual quality of the facade, and achieving the beneficial effect of increasing the life of the board seam sealant. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is a schematic diagram of the structure of the present invention; Figure 4 It is a schematic diagram of the structure of the present invention; Figure 5 It is a schematic diagram of the structure of the present invention; Figure 6 It is a schematic diagram of the structure of the present invention; Figure 7 It is a schematic diagram of the structure of the present invention; Figure 8 It is a schematic diagram of the steps of placing a drainage pipe according to the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0026] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the present invention provides a technical solution: a construction method for the seam of a prefabricated sandwich insulation shear wall exterior wall panel, comprising the following steps: S1: hoisting the exterior wall panel, using a crane to hoist the prefabricated exterior wall panel to a designated position, ensuring that the gaps between the panels are uniform; S2: Grouting of exterior wall panels, pouring high-strength grouting material into the gaps between panels and between panels and the main structure to ensure a firm connection; S3: Process the base surface of the board seams, clean the dust and debris in the board seams, and ensure that the base surface is clean and flat; S4: Repair the damaged base of the components. Check whether the components around the plate joints are damaged. If damaged, repair them to ensure the integrity of the base surface. S5: Repair the width of the board seam. If the width of the board seam is inconsistent, it needs to be adjusted to ensure that the width of the board seam is uniform; S6: Fill the backing material. Fill the backing material (such as polyethylene foam strips) in the board joints to prevent excessive loss of sealant; S7: Paste masking tape on both sides of the board seam to prevent the sealant from overflowing and contaminating the wall surface. The masking tape should be attached tightly and straight to ensure the construction quality; S8: Apply primer on both sides of the board joint to enhance the adhesion of the sealant. The primer should be applied evenly to avoid omissions. S9: Apply sealant, use a sealant gun to evenly apply sealant in the board seams, the sealant should fill the board seams to ensure the sealing effect; S10: Install the drainage pipe at the bottom of the board seam to ensure that rainwater can be discharged smoothly. The drainage pipe should be installed firmly to avoid looseness; S11: Repair the sealant surface. Use special tools to repair the sealant surface to make it flat and smooth, and ensure that there are no bubbles or cracks on the sealant surface. S12: Remove the masking tape. After the sealant is cured, carefully tear off the masking tape to ensure that the edges of the sealant are neat and there is no residual masking tape. S13: Apply mortar and hang mesh on the board joints. Apply mortar and lay steel wire mesh or glass fiber mesh on the board joints. The mortar and mesh should be applied evenly and smoothly to ensure the stability and durability of the structure. S14: Exterior wall paint construction. After completing all the above steps, paint the exterior wall. The paint should be applied evenly to ensure the beauty and protective effect of the exterior wall.

[0027] Specifically, in the S2 exterior wall panel grouting step, temporary sealing materials (such as wooden wedges, rubber strips, etc.) are used to seal the bottom of the board joint to prevent the grouting material from flowing out from the bottom, and a grouting port is set at the upper part of the board joint to ensure that the grouting material can smoothly enter the board joint. Use a grouting pump or manual method to slowly inject the grouting material from the bottom of the board joint until the grouting material overflows from the top. During the grouting process, use a small hammer to gently tap around the board joint to help expel air and ensure that the grouting material is fully filled.

[0028] Specifically, in the step of repairing the damaged base layer of the S4 component, apply the first layer and use a trowel or scraper to evenly apply the repair material on the damaged part with a thickness of about 1-2mm. If the damage is deeper, it can be applied in layers, with a thickness of no more than 2mm. Apply the next layer after the previous layer of material has initially solidified. Finally, use a trowel or scraper to compact the repair material to ensure a smooth surface without bubbles.

[0029] Specifically, in the S5 board seam width repair step, measure the actual width, use a tape measure or ruler to measure the actual width of the board seam, record the data, compare with the design requirements, compare the actual measured width with the design requirements, and determine whether adjustment is needed. When the board seam is too wide, use filling materials such as foamed polyurethane or polyethylene foam strips to fill the board seam to the designed width. If the board seam is wider, it can be filled in layers, and the thickness of each layer should not exceed 20mm. Ensure that the filling material is compacted. Use a scraper or trowel to compact the filling material to ensure that the surface is flat and free of bubbles. When the board seam is too narrow, if the board seam is too narrow, the board seam width can be adjusted by fine-tuning the position of the exterior wall panel. Use a jack or hand tool to gently adjust the position of the panel until the designed width is reached. After the adjustment is completed, re-fix the exterior wall panel to ensure that its position is accurate.

[0030] Specifically, in step S6 of filling the backing material, when cutting the backing material, first use scissors to cut out the backing material of appropriate length according to the length of the board seam, and then cut out the backing material of appropriate width according to the width of the board seam. Usually, the width of the backing material should be about 2-3mm smaller than the width of the board seam to ensure that it can be easily inserted into the board seam. Then, gently insert the cut backing material into the board seam to ensure that it is located in the middle of the board seam. Finally, use a compression tool (such as a wooden stick, an iron rod, etc.) to gently compress the backing material so that it is close to both sides of the board seam, but do not over-compress it to avoid affecting the filling effect of the sealant. Finally, adjust the position to ensure that the position of the backing material in the board seam is even and not skewed.

[0031] Specifically, in the S7 step of pasting masking tape, if the construction is carried out in a cold environment, the surface can be preheated appropriately to improve the bonding effect. Starting from a corner or edge, stick one end of the masking tape on the surface to ensure that the starting point fits tightly. Use your fingers or a scraper to gradually flatten the masking tape from the starting point to the other end to expel bubbles and ensure that each section fits tightly. Use a plastic scraper or special tool to scrape and press the masking tape from the middle to the edge to ensure that the entire surface fits tightly and there are no bubbles. Press gently on the edges of the masking tape, especially at corners and seams, to ensure that the edges fit tightly.

[0032] Specifically, in the S8 primer application step, avoid contamination. After applying the primer, avoid operations that may contaminate the primer near the board joints. Mark the application area to remind subsequent construction personnel to pay attention to protection. Select a suitable primer according to the base material and construction environment to ensure good compatibility with the base and sealant. When applying the primer, avoid excessive application to avoid wasting materials and affecting subsequent construction. Before applying the primer, ensure that the base is clean, flat, free of cracks and looseness to avoid secondary damage. During the application of the primer, avoid causing secondary damage to the surrounding base. Use a spray gun for spraying at a speed of about 2.0-4.0 square meters per minute. The specific speed depends on the pressure of the spray gun and the size of the nozzle. Keep the distance between the spray gun and the substrate moderate (generally 15-30 cm). Move the spray gun evenly to avoid local excessive thickness or thinness.

[0033] Specifically, in the S9 sealant construction step, start from one end of the board joint, use the sealant gun to evenly inject the sealant into the board joint, keep the sealant gun in continuous motion, ensure that the sealant is evenly and continuously injected into the board joint, avoid bubbles and voids, ensure that the sealant is filled to the bottom of the board joint, until the sealant overflows from the other end of the board joint, use a scraper to scrape the sealant flat, ensure that the surface of the sealant is flat and smooth, remove bubbles, and during the scraping process, press lightly with the scraper to remove bubbles in the sealant, and finally trim the edges to ensure that the edges of the sealant are aligned with the masking tape on both sides of the board joint, and the edges are neat and beautiful.

[0034] Specifically, in the step of placing the drain pipe in S10, select a suitable position, and select a suitable position for placing the drain pipe according to the length and position of the board seam. Usually, the drain pipe is set at the lowest point of the board seam or a place where water is easy to accumulate. Mark the installation position of the drain pipe on the board seam with a pen or a marker, and use a drilling tool to drill a hole at the marked position. The hole diameter should be slightly smaller than the outer diameter of the drain pipe to ensure that the drain pipe can be securely installed. Then use a cleaning cloth or a brush to clean the dust and debris in the drilled hole to ensure that the hole is clean. After cleaning, cut the drain pipe with scissors according to the required length, insert the cut drain pipe into the drilled hole, and ensure that the lower end of the drain pipe extends out of the board seam by a certain distance so that water can be discharged smoothly. Use tape or sealant to fix the drain pipe in the hole to ensure that it is firm and not loose, and then apply sealant. Apply an appropriate amount of sealant at the interface between the drain pipe and the hole to ensure that the interface is well sealed to prevent water from penetrating. After applying the sealant, check the sealing effect of the interface to ensure that there is no leakage.

[0035] Working principle: Through multiple procedures, the cleaning of the inside of the board joints, the control and repair of the board joint width, and the requirements for sealant construction are strengthened, which is conducive to the effective bonding of the sealant and the surrounding concrete base, and effectively prevents the sealant in the board joints from being separated from the concrete base, the cracking of the glue joints, and the cracking and falling of the finishing layer. It achieves meticulous and standardized beneficial effects in cleaning the inside of the board joints, controlling the width of the board joints and the filling depth of the backing material. Drain pipes are set at the cross-board joints of every three layers. On the one hand, it can prevent water accumulation in the board joints and the insulation layer due to leakage from the wall and glue joints, and prevent the cavity from being incompatible with the internal and external temperatures. Condensed water can be smoothly discharged when water accumulates in the insulation layer and board seams of the sandwich insulation board wall, thereby avoiding leakage on the inside of the exterior wall and ensuring the durability and use function of the building; on the other hand, after the sealant construction is completed, the pressure difference between the inside and outside of the sealant seam will cause the board seam sealant to bulge or recess, thereby affecting the visual quality of the facade, and in severe cases may even cause the exterior wall real stone paint to crack or fall off. The drainage pipe set up in the new technology solution can also play a venting role, which can balance the pressure difference between the inside and outside of the sealant, effectively avoid the deformation of the sealant in the board seam, and achieve the beneficial effect of the visual quality of the facade; In addition, through the new technical solution, after the construction of the board seam sealant is completed, a polymer waterproof and crack-resistant mortar is added between the weather-resistant sealant and the paint layer. Two layers of alkali-resistant glass fiber mesh cloth are pressed in during the mortar painting process. It is necessary to ensure that the mesh cloth is not exposed to resist the deformation of the board seam sealant. It effectively prevents the cracking and falling off of the exterior wall real stone paint in the board seam area, ensures the visual quality of the facade, and achieves the beneficial effect of increasing the life of the board seam sealant.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for the seam of a prefabricated sandwich insulation shear wall exterior wall, characterized in that: The following steps are involved: S1: Hoisting of exterior wall panels: Use a crane to hoist the prefabricated exterior wall panels to the designated location, ensuring that the gaps between panels are uniform; S2: Grouting of exterior wall panels, pouring high-strength grouting material into the gaps between panels and between panels and the main structure to ensure a firm connection; S3: Process the base surface of the board seams, clean the dust and debris in the board seams, and ensure that the base surface is clean and flat; S4: Repair the damaged base of the components. Check whether the components around the plate joints are damaged. If damaged, repair them to ensure the integrity of the base surface. S5: Repair the width of the board seam. If the width of the board seam is inconsistent, it needs to be adjusted to ensure that the width of the board seam is uniform; S6: Fill the backing material. Fill the backing material (such as polyethylene foam strips) in the board joints to prevent excessive loss of sealant; S7: Paste masking tape on both sides of the board seam to prevent the sealant from overflowing and contaminating the wall surface. The masking tape should be attached tightly and straight to ensure the construction quality; S8: Apply primer on both sides of the board seam to enhance the adhesion of the sealant. The primer should be applied evenly to avoid omissions. S9: Apply sealant, use a sealant gun to evenly apply sealant in the board seams, the sealant should fill the board seams to ensure the sealing effect; S10: Install the drainage pipe at the bottom of the board seam to ensure that rainwater can be discharged smoothly. The drainage pipe should be installed firmly to avoid looseness; S11: Repair the sealant surface. Use tools to repair the sealant surface to make it flat and smooth, and ensure that there are no bubbles or cracks on the sealant surface. S12: Remove the masking tape. After the sealant is cured, carefully tear off the masking tape to ensure that the edges of the sealant are neat and there is no residual masking tape. S13: Apply mortar and hang mesh on the board joints. Apply mortar and lay steel wire mesh or glass fiber mesh on the board joints. The mortar and mesh should be applied evenly and smoothly to ensure the stability and durability of the structure. S14: Exterior wall paint construction. After completing all the above steps, paint the exterior wall. The paint should be applied evenly to ensure the beauty and protective effect of the exterior wall.

2. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: In the S2 exterior wall panel grouting step, temporary sealing materials (such as wooden wedges, rubber strips, etc.) are used to seal the bottom of the board joint to prevent the grouting material from flowing out from the bottom. Grouting ports are set at the upper part of the board joint to ensure that the grouting material can smoothly enter the board joint. Use a grouting pump or manual method to slowly inject the grouting material from the bottom of the board joint until the grouting material overflows from the top. During the grouting process, use a small hammer to knock around the board joint to help expel air and ensure that the grouting material is fully filled.

3. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: In the step of repairing the damaged base of S4 components, apply the first layer and use a trowel or scraper to evenly apply the repair material to the damaged area with a thickness of 1-2mm. If the damage is deep, it can be applied in layers, with a thickness of no more than 2mm. Apply the next layer after the previous layer of material has initially solidified. Finally, use a trowel or scraper to compact the repair material to ensure a smooth surface without bubbles.

4. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1 is characterized by: In the S5 board seam width repair step, measure the actual width, use a tape measure or ruler to measure the actual width of the board seam, record the data, compare it with the design requirements, compare the actual measured width with the design requirements, and determine whether adjustment is needed. When the board seam is too wide, use filling materials such as foamed polyurethane or polyethylene foam strips to fill the board seam to the designed width. If the board seam is wide, it can be filled in layers, and the thickness of each layer should not exceed 20mm. Ensure that the filling material is compacted. Use a scraper or trowel to compact the filling material to ensure that the surface is flat and free of bubbles. When the board seam is too narrow, if the board seam is too narrow, the board seam width can be adjusted by fine-tuning the position of the exterior wall panel. Use a jack or hand tool to adjust the position of the panel until the design width is reached. After the adjustment is completed, re-fix the exterior wall panel to ensure that its position is accurate.

5. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: In the step S6 of filling the backing material, when cutting the backing material, first use scissors to cut out the backing material of appropriate length according to the length of the board seam, and then cut out the backing material of appropriate width according to the width of the board seam. The width of the backing material should be about 2-3mm smaller than the width of the board seam to ensure that it can be easily inserted into the board seam. Then insert the cut backing material into the board seam to ensure that it is located in the middle of the board seam. Finally, use a compression tool (such as a wooden stick, an iron rod, etc.) to compress the backing material so that it is close to both sides of the board seam, but do not over-compress it to avoid affecting the filling effect of the sealant. Finally, adjust the position to ensure that the position of the backing material in the board seam is even and not skewed.

6. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: In the S7 step of pasting the masking tape, if the construction is in a cold environment, the surface can be preheated appropriately to improve the bonding effect. Starting from a corner or edge, stick one end of the masking tape on the surface, making sure that the starting point fits tightly. Use your fingers or a scraper to gradually flatten the masking tape from the starting point to the other end, expel bubbles, and ensure that each section fits tightly. Use a plastic scraper or tool to scrape and press the masking tape from the middle to the edge, ensuring that the entire surface fits tightly and there are no bubbles. Press at the edges of the masking tape, especially at corners and seams, to ensure that the edges fit tightly.

7. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: During the S8 primer application step, avoid contamination. After applying the primer, avoid operations that may contaminate the primer near the board joints. Mark the application area to remind subsequent construction personnel to pay attention to protection. Select a suitable primer based on the substrate material and construction environment to ensure good compatibility with the substrate and sealant. When applying the primer, avoid excessive application to avoid wasting materials and affecting subsequent construction. Before applying the primer, ensure that the substrate is clean, flat, free of cracks and looseness to avoid secondary damage. During the primer application process, avoid causing secondary damage to the surrounding substrates. Use a spray gun for spraying at a speed of about 2.0-4.0 square meters per minute. The specific speed depends on the pressure of the spray gun and the size of the nozzle. Keep a moderate distance between the spray gun and the substrate (15-30 cm). Move the spray gun evenly to avoid local over-thickness or over-thinness.

8. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: In the S9 sealant construction step, start from one end of the board joint and use the sealant gun to evenly inject the sealant into the board joint. Keep the sealant gun moving continuously to ensure that the sealant is evenly and continuously injected into the board joint to avoid bubbles and voids. Ensure that the sealant is filled to the bottom of the board joint until the sealant overflows from the other end of the board joint. Use a scraper to scrape the excess sealant to ensure that the surface of the sealant is flat and smooth and remove bubbles. During the scraping process, press with a scraper to remove bubbles in the sealant. Finally, trim the edges to ensure that the edges of the sealant are aligned with the masking tape on both sides of the board joint, and the edges are neat and beautiful.

9. The construction method of the prefabricated sandwich insulation shear wall exterior wall seam according to claim 1, characterized in that: In the step of placing the drain pipe in S10, select a suitable position. According to the length and position of the board seam, select a suitable position for placing the drain pipe. Set the drain pipe at the lowest point of the board seam or where water is likely to accumulate. Mark the installation position of the drain pipe on the board seam with a pen or a marker. Use a drilling tool to drill a hole at the marked position. The hole diameter should be smaller than the outer diameter of the drain pipe to ensure that the drain pipe can be securely installed. Then use a cleaning cloth or a brush to clean the dust and debris in the drill hole to ensure that the hole is clean. After cleaning, cut the drain pipe with scissors according to the required length. Insert the cut drain pipe into the drill hole to ensure that the lower end of the drain pipe extends out of the board seam by a certain distance so that water can be discharged smoothly. Use tape or sealant to fix the drain pipe in the hole to ensure that it is firm and not loose. Then apply sealant. Apply an appropriate amount of sealant at the interface between the drain pipe and the hole to ensure that the interface is well sealed to prevent water from penetrating. After applying the sealant, check the sealing effect of the interface to ensure that there is no leakage.

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