A construction method for exterior wall reconstruction

Abstract

The present invention proposes a method for exterior wall renovation construction, including the following steps: S1. First, conduct a comprehensive inspection of the wall surface and mark the loose, hollow, and cracked parts; S2. Arrange partial chiseling and repairing to make it smooth; S3. After repairing and smoothing, add a stainless steel mesh and fix it with a fixing piece; S4. Carry out the construction of anti-cracking putty; S5. Carry out the coating process construction; S6. After the coating process putty construction is completed, cut the temperature shrinkage joint of the large-surface wall surface and fill and seal it with a special structural weather-resistant glue. The optimized process not only ensures the integrity of the wall surface, but also adds a stainless steel mesh on this basis, which can effectively prevent and reinforce the wall surface, so that the wall surface can avoid and reduce the hidden dangers caused by cracking and hollowing again after decades, and at the same time accurately repair the hollow and cracked parts, avoiding the dust, noise, water seepage and falling objects caused by large-scale blind chiseling, shortening the renovation period, and reducing the construction cost.

Description

Technical Field

[0001] The invention relates to the technical field of building reconstruction, in particular to an exterior wall reconstruction construction method. Background Art

[0002] As time goes by, the exterior walls of high-rise buildings are generally cracked and hollowed, which causes water seepage and falling off of the walls, seriously affecting people's normal life and travel, and posing serious safety hazards. For this reason, many communities have begun to arrange facade improvement and repair work for the existing facades, but the current repair technology still has many shortcomings, and the repair process still largely affects people's life, safety, travel and other aspects.

[0003] The current repair process is to remove all the original exterior wall surfaces to the structural surface → clean the wall → repaint the exterior wall to the original thickness (2-3 times) → water the wall for maintenance → apply wall putty (after the painted surface reaches a certain strength) → perform paint process construction.

[0004] Since most of the buildings under renovation are high-rise buildings, it is impossible to set up external scaffolding for closed construction, and only hanging baskets can be used for construction. However, the following problems exist when removing the original wall paint layer: 1. A large amount of cutting before chiseling will generate a lot of dust; 2. The chiseling tools will generate a lot of noise and vibration when chiseling the wall; 3. There is a hidden danger of falling objects being demolished during demolition; 4. The workload of demolishing a single facade is large, which affects the progress of the next step of the single facade; 5. The base wall of the demolished wall is exposed to the outside for a long time due to the progress, increasing the risk of water seepage; 6. In the later stage of painting, the wall needs to be cleaned and watered for maintenance, which also increases the risk of water seepage. In addition, large-scale painting fails to ensure timely vertical transportation and supply of materials, resulting in construction joints during construction, which bury the risk of wall cracking and hollowing. 7. Increase the overall construction cost; 8. Long construction period; 9. Great impact on people's safety, life and travel. In view of the problem that large-scale chiseling and painting are not suitable for the above-mentioned high-rise buildings, a method of exterior wall renovation construction is proposed. Summary of the invention

[0005] The purpose of the present invention is to solve the problems in the prior art and to provide an exterior wall renovation construction method that can effectively prevent and reinforce the wall surface, shorten the renovation period and reduce the construction cost.

[0006] To achieve the above-mentioned purpose, the present invention proposes an exterior wall reconstruction construction method, in which a stainless steel mesh is added after the wall surface is repaired and leveled, and fixed with fixing parts.

[0007] As a preference, the method specifically comprises the following steps:

[0008] S1. First, conduct a comprehensive inspection of the wall and mark the loose, hollow, and cracked areas;

[0009] S2. Arrange local chiseling and repair to make it smooth;

[0010] S3. After the repair is smooth, add a stainless steel mesh and fix it with fixing parts;

[0011] S4. Apply plaster to the exterior wall, and completely cover the stainless steel mesh and fixings, and then apply anti-cracking putty;

[0012] S5. Carry out coating process construction;

[0013] S6. After the coating putty construction is completed, cut the temperature shrinkage joints on the large wall surface and fill and seal them with structural weather-resistant glue;

[0014] Wherein, step S4 specifically includes the following steps:

[0015] a1. Use ceramic plaster for exterior wall plastering, and the ceramic plastering should completely cover the stainless steel mesh and fixings;

[0016] a2. According to the grid design requirements, first make the lines, the horizontal grid lines and the vertical grid lines are perpendicular, the adjacent horizontal grid lines are parallel, the adjacent vertical grid lines are parallel, and the grid lines are pasted with foam strips for protection;

[0017] a3. Apply two coats of anti-cracking putty to the exterior wall, with the interval time being after the first coat of putty is completely dry;

[0018] a4. Grind and repair the entire exterior wall surface, and remove the foam strips;

[0019] Wherein, step a3 specifically includes the following steps:

[0020] a31. Anti-cracking putty;

[0021] a32. Hang high-strength fiber mesh;

[0022] a33. Anti-cracking putty;

[0023] a34. Apply two coats of anti-cracking smooth putty;

[0024] Wherein, step S5 specifically includes the following steps:

[0025] b1. Apply alkali-resistant primer to the exterior wall;

[0026] b2. After the primer is completely dry, apply two coats of middle-layer elastic paint for exterior walls;

[0027] b3. After the middle layer of elastic paint is completely dry, spray two coats of colorful real stone paint;

[0028] b4. After the colorful real stone paint is dry, roll on the special finishing paint for exterior walls.

[0029] Preferably, in step S3, after the repair is smoothed, the grid positions are first designed on the facade of the exterior wall, and separation seams are set on each layer. The separation seams are cut to the structural layer and sealed with structural adhesive, and then the stainless steel mesh is fixed.

[0030] Preferably, the width of the separation gap is 2-4 mm.

[0031] Preferably, in step S3, the local bulges of the stainless steel mesh are fixed with glue, the stainless steel mesh is disconnected at the separation seams of each layer, and stainless steel screws are driven into the disconnected positions.

[0032] Preferably, in step S3, stainless steel screws are arranged in a plum blossom shape with a spacing of no more than 50 cm per square, and are fixed with gaskets.

[0033] The beneficial effects of the present invention are as follows: the present invention not only ensures the integrity of the wall surface by optimizing the process, but also adds a stainless steel mesh on this basis, which can effectively prevent and reinforce the wall surface, so that the wall surface can avoid and reduce the hidden dangers caused by cracking and falling off caused by hollowing after decades, and accurately repair hollowing and cracked parts, avoiding the influence of dust, noise, water seepage and falling objects caused by large-scale blind chiseling, shortening the renovation period and reducing construction costs, ensuring and reducing the impact on the lives and safety of residents and pedestrians caused by the renovation, so that the facade renovation and improvement project strives to be a livelihood project that benefits the people.

[0034] The features and advantages of the present invention will be described in detail through embodiments. DETAILED DESCRIPTION

[0035] A method for exterior wall reconstruction construction comprises the following steps:

[0036] S1. First, conduct a comprehensive inspection of the wall and mark the loose, hollow, and cracked areas;

[0037] S2. Arrange partial chiseling and repairing for smoothing. If there are hollows or falling off of the external wall tiles, part of the tile layer needs to be removed and repaired. When removing the external wall tiles, the removed tiles need to be caught with baffles and transported to the ground with a hanging basket. A double-layer safety protection shed is set up in the construction area, and a safety net is used for enclosure to prevent objects from falling;

[0038] S3. After the repair is smoothed, first design the grid position on the facade of the exterior wall, set a 2-4mm wide separation seam on each layer, cut the separation seam to the structural layer, and seal it with structural glue, then use 304 stainless steel screws with a length of 8-10cm arranged in a plum blossom shape with a spacing of no more than 50cm per square, and use 2cm diameter gaskets to fix it. In addition, the local bulges of the stainless steel mesh are fixed with adhesive, and the stainless steel mesh is disconnected at the separation seam of each layer, and stainless steel screws are driven into the disconnected position;

[0039] S4. Carry out the construction of anti-cracking putty, specifically comprising the following steps:

[0040] a1. Use ceramic plaster for exterior wall plastering, and the plastering should completely cover the stainless steel mesh and fixings;

[0041] a2. According to the grid design requirements, first make the lines, the horizontal grid lines and the vertical grid lines are perpendicular, the adjacent horizontal grid lines are parallel, the adjacent vertical grid lines are parallel, and the grid lines are pasted with foam strips for protection. The width of the grid lines is 8mm-10mm;

[0042] a3. Apply two coats of special anti-cracking putty to the exterior wall, with the interval time being after the first coat of putty is completely dry;

[0043] a4. Grind and repair the entire exterior wall surface, and remove the foam strips;

[0044] S5. Carry out coating process construction, specifically including the following steps:

[0045] b1. Apply alkali-resistant primer to the exterior wall;

[0046] b2. After the primer is completely dry, apply two coats of middle-layer elastic paint for exterior walls;

[0047] b3. After the middle layer of elastic paint is completely dry, spray two coats of colorful real stone paint;

[0048] b4. After the colorful real stone paint is completely dry, roll on the special finishing paint for exterior walls;

[0049] S6. After the paint putty construction is completed, cut the temperature shrinkage joints on the large wall surface and fill and seal them with special structural weather-resistant glue.

[0050] Furthermore, step a3 specifically includes the following steps:

[0051] a31. Anti-cracking putty;

[0052] a32. Hang high-strength fiber mesh;

[0053] a33. Anti-cracking putty;

[0054] a34. Apply two coats of anti-cracking glossy putty.

[0055] Example 1

[0056] 1. Project Overview

[0057] Project scale: The community has 4 buildings in total, with a total height of about 100 meters and an area of ​​about 50,000 square meters.

[0058] 1.1 Project content: The original exterior walls of buildings 1#, 2#, 3#, and 4# have partially fallen off, and the exterior walls of buildings 3# and 4# are now being renovated with colorful real stone paint.

[0059] 1.2 Project characteristics and difficulties:

[0060] The project involves the renovation of the exterior wall with colorful real stone paint. Part of the exterior wall is loose and hollow, and the repair is done by chiseling. The key and difficulty is safety protection. During the construction period, residents will continue to live and travel as usual, and buildings 1#, 3#, 4# and the podium are commercial storefronts and open as usual.

[0061] 1) A double-layer safety shed with a width of more than 4m shall be set up in the ground floor construction area, and a safety net shall be used for enclosure to ensure the safety of residents’ access and property safety.

[0062] 2) The exterior wall of this residential building has hollows or peeling. In order to avoid causing personal or property damage to the residents of this building, part of the surface layer needs to be removed and repaired to make it smooth. The base layer should be treated by hanging 304 stainless steel wire mesh and applying special ceramic treasure for the exterior wall.

[0063] 3) When removing the outer wall of this residential building, the removed surface must be caught with a baffle as it is being kicked away, and then put into a bucket and transported to the ground using a hanging basket. The removed plaster fragments must not be dropped downstairs at will to avoid accidental injuries.

[0064] 4) As the community has been delivered for occupancy for many years, there are air-conditioning outdoor units, anti-theft fences, flower stands, awnings, etc. on the exterior walls. If they have a significant impact on the construction operation surface, they must be removed before construction can begin, otherwise the operators will not be able to carry out construction.

[0065] 2. Construction deployment

[0066] 2.1 Organizational Structure

[0067] The project manager is responsible for organizing and implementing the work, and other personnel will cooperate. The foreman is responsible for compiling the materials and labor plan required for the construction of the building, and the material clerk is responsible for organizing the entry of relevant materials. Before construction, the foreman and the full-time safety officer should provide safety education and written instructions to the operators.

[0068] 2.2 Workforce Preparation

[0069] The construction of this project will be carried out in the order of Building 4# → Building 3# → Building 1# → Building 2#, and each building will be constructed from the east, west, south and north sides to facilitate construction and construction management.

[0070] The construction of each building requires a total of 15 painters and 1 full-time safety officer.

[0071] 2.3 Material preparation

[0072] 1. Paint: Select according to the design, Party A's requirements and sample colors, and all materials used should be prepared at one time. The paint should have a factory certificate, factory date and instruction manual.

[0073] 2. Ceramic sealant, steel mesh, exterior wall putty, paint, etc.: should meet the design requirements and the standards specified by the current national and industry specifications. Among them, ceramic sealant is an interface adhesive on the ceramic surface, glass surface, and metal surface. It can be made of Bo Ming two-component ceramic sealant or single-component ceramic sealant produced by Hangzhou Lantian Paint Co., Ltd.

[0074] 3.4 Equipment preparation

[0075] 1. Painting tools: paint brush, spray gun, paint brush.

[0076] 2. Roller coating tools: plush roller and material bucket.

[0077] 3. Spreading tools: iron spatula, putty knife, ash tray, etc. and electric mixer.

[0078] 4. Plastering tools: scraper, iron trowel.

[0079] 5. Hanging basket, air pump, etc.

[0080] 6. Base processing tools, cutting machine, electric drill, wire mesh, chisel, hammer, etc.

[0081] The safety protection shed is completed by Party A, and the hanging basket is issued with a special construction plan by a qualified rental manufacturer, and is delivered for use after passing the expert acceptance. The hanging basket manufacturer needs to cooperate with the construction team on site to carry out construction.

[0082] 3.5 Working conditions

[0083] 1. After the base is repaired, it should be inspected and construction can only be carried out after it passes the inspection.

[0084] 2. According to the project volume and construction schedule, arrange the personnel of each type of work reasonably, prepare the corresponding machinery and equipment, and connect the power supply for testing. Ensure the operation and construction under safe conditions, and do not operate the machinery with defects.

[0085] 3. Before formal construction, a sample wall must be made according to Party A’s requirements. Large-scale construction can only be carried out after Party A and other personnel confirm that the quality meets the requirements and construction specifications.

[0086] 4. The ambient temperature at the construction site must not be lower than 5°C. Construction is prohibited when there is thunder, rain or a level 4 gale.

[0087] 3. Operation process

[0088] 3.1 Base treatment: First, remove the loose and hollow parts on the steel brick wall and make it smooth, and clean up the dust, dirt and other debris remaining on the surface of the base.

[0089] 3.2 The exterior wall facade is designed to have partition positions, with a separation seam of about 3 mm on each layer. The separation seam is cut to the structural layer and sealed with structural adhesive.

[0090] 3.3 The wall is covered with national standard 304 stainless steel mesh (aperture 10mm), and fixed with 8-10cm long stainless steel screws, with a spacing of 50cm. The bulges of the stainless steel mesh are fixed with glue. The stainless steel mesh is disconnected at the separation seam of each layer, and stainless steel screws must be driven into the disconnected position.

[0091] 3.4 Use brand two-component exterior wall special ceramic treasure to plaster. In principle, use ceramic treasure to completely cover the stainless steel mesh and fixings (to ensure the strength of adhesion and bite force).

[0092] 3.5 According to the grid design requirements, first draw the lines. The horizontal and vertical grid lines must be parallel and vertical, and the grid lines should be pasted with foam strips for protection. The width of the grid lines is (8mm-10mm).

[0093] 3.6 Apply two coats of special exterior wall anti-cracking putty on the exterior wall (the interval is after the first coat of putty is completely dry).

[0094] 3.7 The exterior wall surface is sanded and repaired, and the foam strips are removed. In addition, the railings, doors, windows and other finished products are covered with plastic film for protection.

[0095] 3.8 Apply alkali-resistant primer to the exterior wall.

[0096] 3.9 After the primer is dry, apply two coats of middle-layer elastic paint specially used for exterior walls.

[0097] 3.10 After the middle layer of elastic paint is dry, spray two coats of colorful real stone paint.

[0098] 3.11 After the colorful real stone paint is dry, roll on the special finishing paint for exterior walls.

[0099] 3.12 After the construction is completed, check and trim the wall surface, glue and grout the partition joints, and clean up the site.

[0100] 4. Quality Standards

[0101] 1. Main control items

[0102] 1. The types, models and performance of ceramic treasures, exterior wall putties and coatings used in the project should meet the design requirements.

[0103] Inspection method: Check product certificate, performance test report and on-site acceptance record.

[0104] 2. The color and pattern of the paint project should meet the design requirements.

[0105] Inspection method: observation.

[0106] 3. The coating project should be applied evenly and firmly bonded, without any missing parts, showing through, peeling or powdering.

[0107] Inspection method: observation; manual inspection.

[0108] 4. The base putty should be flat, solid and firm, without powdering, peeling and cracks.

[0109] Inspection methods: observation; manual inspection; inspection of construction records.

[0110] 6. Finished product protection

[0111] 1. Before construction, clean the surrounding environment to prevent dust from flying and affecting the quality of the finish. Door and window frames, glass and areas that do not need to be sprayed should be shielded. If sprayed on glass, etc., it should be wiped clean in time to prevent the coating from being difficult to clean after drying.

[0112] 2. Avoid rain within 12 hours after construction and do not construct on rainy days.

[0113] 3. When applying, do not contaminate the ground, balcony, window sills, doors, windows, glass and other finished products.

[0114] 4. When using and disassembling the hanging basket, be careful to avoid scratching the surface and damaging the wall corners.

[0115] Example 2

[0116] A method for exterior wall reconstruction construction comprises the following steps:

[0117] S1. Partial wall removal, repair (35%), garbage cleaning and removal;

[0118] S2. Spraying sealing primer (high efficiency);

[0119] S3. Punch holes, hang 304 stainless steel mesh, and fix 304 stainless steel bolts;

[0120] S4. Ceramic sealant (thickness should be enough to cover the mesh surface);

[0121] S5. Cut each layer of split seams and apply structural glue to the split seams;

[0122] S6. Anti-cracking putty (coarse sand thickness: 2.5cm~3.5cm);

[0123] S7. Hang high-strength fiber mesh;

[0124] S8. Anti-cracking putty (thickness of fine sand: 1cm to 2cm);

[0125] S9. Anti-cracking smooth putty (two coats);

[0126] S10. Grinding, repairing and laying out;

[0127] S11. Apply alkali-resistant sealing primer;

[0128] S12. Colored imitation stone coating (two coats);

[0129] S13. Spraying colorful imitation stone paint (two coats);

[0130] S14. Spraying high-efficiency color-protecting varnish;

[0131] S15. Dye or glue the dividing seams and clean the finished wall surface.

[0132] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims

1. A construction method for exterior wall reconstruction, characterized in that: The specific steps include: S1. First, conduct a comprehensive inspection of the wall and mark the loose, hollow, and cracked areas; S2. Arrange local chiseling and repair to make it smooth; S3. After the repair is smoothed, first design the grid positions on the facade of the exterior wall, set the separation seams on each layer, cut the separation seams to the structural layer, and seal them with structural adhesive, then add stainless steel mesh and fix them with fixing parts, and cover the wall with stainless steel mesh. The stainless steel mesh is disconnected at the separation seams of each layer, and the local bulges of the stainless steel mesh are fixed with adhesive, and stainless steel screws are driven into the disconnected positions; S4. Use ceramic treasure to carry out exterior wall plastering construction, and the plastering should completely cover the stainless steel mesh and fixings, and then carry out anti-cracking putty construction; S5. Carry out coating process construction; S6. After the coating putty construction is completed, cut the temperature shrinkage joints on the large wall surface and fill and seal them with structural weather-resistant glue; Wherein, step S4 specifically includes the following steps: a1. Use ceramic plaster for exterior wall plastering, and the ceramic plastering should completely cover the stainless steel mesh and fixings; a2. According to the grid design requirements, first make the lines, the horizontal grid lines and the vertical grid lines are perpendicular, the adjacent horizontal grid lines are parallel, the adjacent vertical grid lines are parallel, and the grid lines are pasted with foam strips for protection; a3. Apply two coats of anti-cracking putty to the exterior wall, with the interval time being after the first coat of putty is completely dry; a4. Grind and repair the entire exterior wall surface, and remove the foam strips; Wherein, step a3 specifically includes the following steps: a31. Anti-cracking putty; a32. Hang high-strength fiber mesh; a33. Anti-cracking putty; a34. Apply two coats of anti-cracking smooth putty; Wherein, step S5 specifically includes the following steps: b1. Apply alkali-resistant primer to the exterior wall; b2. After the primer is completely dry, apply two coats of middle-layer elastic paint for exterior walls; b3. After the middle layer of elastic paint is completely dry, spray two coats of colorful real stone paint; b4. After the colorful real stone paint is dry, roll on the special finishing paint for exterior walls.

2. The exterior wall reconstruction construction method according to claim 1, characterized in that: The width of the separation seam is 2-4 mm.

3. The exterior wall reconstruction construction method according to claim 1, characterized in that: In step S3, stainless steel screws are arranged in a plum blossom shape with a spacing of no more than 50 cm per square, and are fixed with gaskets.