Low-damage repair construction equipment and method for urban updated old wall surface

Abstract

The invention relates to the technical field of wall surface repairing, in particular to low-damage repairing construction equipment and method for urban updated old wall surfaces. Comprising the following steps: treating a damaged area by using a tool to obtain a concrete base layer; the concrete base is pretreated through an auxiliary device, and the clean concrete base is obtained; stirring the guniting material by adopting stirring equipment, and providing the guniting material for a clean concrete base layer; extracting the prepared guniting raw material by using galling equipment, and spraying the clean concrete base layer to obtain a galling layer; the galling layer is maintained and strengthened through an ethylene film, and a qualified galling layer interface is obtained; preparing ash putty by using a stirring device, and combining the ash putty with the galling layer interface to obtain a concrete wall surface; the outer wall coating is selected and smeared to the concrete wall surface, the repaired wall surface is obtained, overall modification is avoided, the construction cost is reduced, and damage to a base layer damage structure is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wall repair, and in particular to low-damage repair construction equipment and method for old walls in urban renewal. Background Art

[0002] Urban renewal is a necessary and planned reconstruction activity in areas of the city that are no longer suitable for modern urban social life. It is also a construction activity to better meet people's expectations and needs and better adapt to the actual economic and social development. Combined with the current situation of urban construction in China, almost all cities have some old communities that need to be renovated, especially the exterior walls. Due to long-term wind and sun exposure, the walls are aging, which not only affects the appearance but also often causes casualties due to partial falling off of the front. Therefore, how to repair the exterior walls has always been an important construction problem in urban renewal activities.

[0003] Traditional repairs during damage not only have high construction costs, but also the removal of large areas of decorative layers can easily cause structural damage due to differences in construction quality. Therefore, a repair construction device and method are provided that achieves double bonding and reduces damage to the old base layer. Summary of the Invention

[0004] The purpose of the present invention is to provide a low-damage repair construction equipment and method for old wall surfaces in urban renewal, aiming to solve the technical problems in the existing technology that traditional damage-time rectification not only has high construction costs, but also large-scale removal of decorative layers can easily cause structural damage due to differences in construction levels.

[0005] To achieve the above-mentioned purpose, the present invention adopts a low-damage repair construction method for old wall surfaces in urban renewal, which includes the following steps: using tools to process the damaged area to obtain a concrete base; pre-treating the concrete base with auxiliary equipment to obtain a clean concrete base; using a mixing device to stir the spraying material to provide spraying raw materials for the clean concrete base; using a roughening device to extract the prepared spraying raw materials, and spraying the clean concrete base to obtain a roughened layer; curing and strengthening the roughened layer with an ethylene film to obtain a qualified roughened layer interface; using a stirring device to prepare gray putty, and then combining it with the roughened layer interface to obtain a concrete wall surface; selectively applying exterior wall paint to the concrete wall surface to obtain a repaired wall surface.

[0006] Among them, thermal imaging is used to inspect the base layer and form repair boundaries for loose and damaged areas;

[0007] The area formed by the repair boundary is manually struck with a hollow hammer to obtain the clean concrete base.

[0008] Among them, use a broom to clean the wall thoroughly and remove the debris attached to the surface;

[0009] Use a high-pressure water gun mixed with neutral detergent to wash away dust and oil stains;

[0010] A water-based penetrating interface agent is rolled to form a micro-anchoring structure to obtain the clean concrete base layer to be processed.

[0011] Among them, prepare polyvinyl alcohol solution, cement and sand according to the mass ratio of 0.3:1:1.5:

[0012] Pour cement and sand into the forced mixer in sequence and dry mix them to make the two materials preliminarily mixed evenly:

[0013] Then, the polyvinyl alcohol solution is added and stirred to obtain the spraying raw material.

[0014] Among them, the high-pressure shotcrete machine was fully and carefully debugged;

[0015] The spraying raw material is poured into the high-pressure spraying machine to perform operation to obtain the roughened layer.

[0016] wherein, cement mortar is prepared in a ratio of 1:3 to obtain a bottom plaster layer;

[0017] Then, a plaster board is used to apply the plaster to the interface between the bottom plaster and the roughened layer for bonding to obtain the concrete wall surface.

[0018] Wherein, the primer is evenly applied first to enhance the adhesion of the concrete wall;

[0019] Select appropriate exterior wall paint and repair the finishing layer;

[0020] An ultrasonic detector is used to perform empty package detection to obtain the repaired wall surface.

[0021] The present invention also provides a low-damage repair construction equipment for old wall surfaces in urban renewal, comprising a damage treatment module, a pretreatment base surface module, a spraying material preparation module, a roughening construction module, an enhanced maintenance module, a gray putty preparation module and a finishing layer coating module, wherein the pretreatment base surface module is connected to the damage treatment module, the spraying material preparation module is connected to the pretreatment base surface module, the spraying material preparation module is connected to the pretreatment base surface module, the roughening construction module is connected to the spraying material preparation module, the enhanced maintenance module is connected to the roughening construction module, the gray putty preparation module is connected to the enhanced maintenance module, and the finishing layer coating module is connected to the gray putty preparation module.

[0022] The present invention provides a low-damage repair construction equipment and method for old wall surfaces in urban renewal. The equipment and method comprise the following steps: using tools to process damaged areas to obtain a concrete base; pre-treating the concrete base surface by means of auxiliary devices to obtain a clean concrete base surface; using a mixing device to stir a spray material to provide a spray raw material for the clean concrete base surface; using a roughening device to extract the prepared spray raw material, spraying the clean concrete base surface to obtain a roughened layer; curing and strengthening the roughened layer by means of an ethylene film to obtain a qualified roughened layer interface; using a stirring device to prepare gray putty, and then combining it with the roughened layer interface to obtain a concrete wall surface; selectively applying exterior wall paint to the concrete wall surface to obtain a repaired wall surface. In this way, the old wall surface is repaired, overall changes are avoided, construction costs are reduced, and damage to the base structure is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 The present invention is a flowchart of a low-damage repair construction method for old wall surfaces in urban renewal.

[0025] Figure 2 It is a step flow chart of S100 of the present invention.

[0026] Figure 3 It is a step flow chart of S200 of the present invention.

[0027] Figure 4 It is a step flow chart of S300 of the present invention.

[0028] Figure 5 It is a step flow chart of S400 of the present invention.

[0029] Figure 6 It is a step flow chart of S500 of the present invention.

[0030] Figure 7 It is a step flow chart of S600 of the present invention.

[0031] Figure 8 This is a structural principle diagram of the low-damage repair construction equipment for old wall surfaces in urban renewal according to the present invention.

[0032] 801-Damage treatment module, 802-Pretreatment base surface module, 803-Spraying material preparation module, 804-Roughening construction module, 805-Intensified maintenance module, 806-Gray putty preparation module, 807-Finishing layer application module. DETAILED DESCRIPTION

[0033] Exemplary embodiments are described in detail herein, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numerals in different drawings represent identical or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with this application.

[0034] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0035] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0036] See also Figures 1 to 7 , Figure 1 This is a flow chart of the low-damage repair construction method for urban renewal of old walls of the present invention. Figure 2 is a flow chart of the steps of S100 of the present invention, Figure 3 is a flow chart of the steps of S200 of the present invention, Figure 4 is a flow chart of the steps of S300 of the present invention, Figure 5 is a flow chart of the steps of S400 of the present invention, Figure 6 is a flow chart of the steps of S500 of the present invention, Figure 7 It is a flowchart of the steps of S600 of the present invention.

[0037] The present invention provides a low-damage repair construction method for old wall surfaces in urban renewal, comprising the following steps:

[0038] S100 uses tools to treat the damaged area to obtain a concrete base;

[0039] S200 pre-treats the concrete base using auxiliary tools to obtain a clean concrete base;

[0040] S300 uses a mixing device to mix the shotcrete material to provide the shotcrete raw materials for the clean concrete base;

[0041] S400: using a roughening device to extract the prepared spraying raw material and spraying it on the clean concrete base to obtain a roughened layer;

[0042] S500: Curing and strengthening the roughened layer by using a vinyl film to obtain a qualified roughened layer interface;

[0043] S600 uses a stirring device to prepare gray putty, and then combines it with the roughened layer interface to obtain a concrete wall surface;

[0044] S700 selects to apply exterior wall paint to the concrete wall to obtain a repaired wall.

[0045] In this embodiment, the damaged area is processed by tools to obtain a concrete base; the concrete base is pre-treated by auxiliary tools to obtain a clean concrete base; a mixing device is used to stir the spraying material to provide the clean concrete base with spraying raw materials; a roughening device is used to extract the prepared spraying raw materials and spray the clean concrete base to obtain a roughened layer; the roughened layer is cured and strengthened by a vinyl film to obtain a qualified roughened layer interface; a mixing device is used to prepare gray putty, which is then combined with the roughened layer interface to obtain a concrete wall surface; exterior wall paint is selected and applied to the concrete wall surface to obtain a repaired wall surface. In this way, the old wall surface is repaired, overall changes are avoided, construction costs are reduced, and damage to the base structure is reduced.

[0046] Furthermore, in the step of using tools to process the damaged area to obtain a concrete base:

[0047] Use thermal imaging to inspect the base layer and form repair boundaries for loose and damaged areas;

[0048] The area formed by the repair boundary is manually struck with a hollow hammer to obtain the clean concrete base.

[0049] In this embodiment, a handheld infrared thermal imager is used to scan the wall surface, marking areas of abnormal temperature (the hollow areas are lower in temperature than the surrounding base due to air insulation), forming the repair boundary. The construction personnel use the hollowing hammer to gently tap along the edge of the tile to separate it from the concrete base. The tile is then carefully removed to avoid damaging the surrounding intact tiles. After removing the tile, a wire brush, spatula, or other tools are used to thoroughly clean the remaining adhesive to ensure that the base surface is flat and clean. For damaged exterior wall paint, a sharp spatula is used to gradually scrape away from the outside to the inside and from shallow to deep until the solid base is reached. The scraping range should extend 100mm beyond the damaged edge to ensure the firmness of the repair. For the hollow areas of the concrete base, fine stone concrete with a strength grade one level higher than the original concrete is used to fill them.

[0050] Before filling, remove any loose concrete around the cavity, rinse with clean water, and wet the base. Then, fill the cavity in layers of evenly mixed fine stone concrete, keeping each layer 3-5 cm thick. Use a vibrator or small iron rod to gently compact the concrete until the surface is flat and slightly higher than the original base. For cracks in the brickwork base, repair with a 1:2.5 cement mortar. Before repairing, clean any dust and debris from the cracks, rinse with clean water, and wet the cracks. Then, fill the cracks with cement mortar, compacting and smoothing it with a trowel to ensure the repaired surface is flush with the original wall surface, with no noticeable height differences.

[0051] Furthermore, use a broom to clean the wall thoroughly to remove debris attached to the surface;

[0052] Use a high-pressure water gun mixed with neutral detergent to wash away dust and oil stains;

[0053] A water-based penetrating interface agent is rolled to form a micro-anchoring structure to obtain the clean concrete base layer to be processed.

[0054] In this embodiment, at the beginning of construction, the wall surface is first cleaned thoroughly with the broom to remove dust, leaves, spider webs and other debris on the surface. For stubborn stains such as oil stains and release agents, a wire brush is used to dip in an appropriate amount of detergent and wipe repeatedly until the stains are completely removed. For tile walls, if there is a wax layer on the surface, a special tile wax cleaner needs to be selected. After diluting it according to the product instructions, it is evenly applied to the wall surface with a rag and left to stand for 5-10 minutes. After the wax layer is fully dissolved, rinse with clean water;

[0055] Undamaged ceramic tiles or exterior paint walls are washed with the high-pressure water gun. Adjust the pressure of the high-pressure water gun to an appropriate range (generally 5-8 MPa), keep the spray gun 30-40 cm away from the wall, and move the spray gun at a constant speed from bottom to top and from left to right to ensure that every part of the wall can be washed. During the washing process, a long-handled brush can be used to assist in cleaning local stubborn dirt. After the washing is completed, let the wall dry naturally, and then roll on the water-based penetrating interface agent to form a micro-anchoring structure to obtain the clean concrete base to be processed.

[0056] Furthermore, polyvinyl alcohol solution, cement and sand were prepared in a mass ratio of 0.3:1:1.5:

[0057] Pour cement and sand into the forced mixer in sequence and dry mix them to make the two materials preliminarily mixed evenly:

[0058] Then, the polyvinyl alcohol solution is added and stirred to obtain the spraying raw material.

[0059] In this embodiment, the ratio is controlled as follows: polyvinyl alcohol: cement: sand = 0.3:1:1.5 (mass ratio), the water temperature is 85±5° C. to dissolve the polyvinyl alcohol, the stirring time is ≥5 minutes, and the consistency is controlled at 130±10 mm.

[0060] Pour cement and sand into the forced mixer in sequence, and dry mix for 1-2 minutes to allow the two materials to be initially mixed evenly. Then, add the cooled polyvinyl alcohol solution to the mixer at a slow and uniform speed, stirring while adding. The stirring time should be no less than 3 minutes to ensure that the materials are fully mixed without caking or precipitation. The consistency of the spraying material is crucial and needs to be strictly controlled between 120-140mm. In the actual preparation process, the consistency can be precisely controlled by fine-tuning the amount of the polyvinyl alcohol solution according to the on-site ambient temperature, humidity and the actual characteristics of the material. Aging management: Use within 2 hours after material preparation. Add 0.2% retarder (as a percentage of cement mass) during high temperatures in summer to prevent premature hydration.

[0061] Furthermore, the high-pressure shotcrete machine was fully and carefully debugged;

[0062] The spraying raw material is poured into the high-pressure spraying machine to perform operation to obtain the roughened layer.

[0063] In this embodiment, the high-pressure spraying machine commissioning: Before the formal spraying and roughening construction, the spraying equipment must be fully and carefully commissioned. First, check the connection of each component of the equipment, especially the connection between the spray gun and the feed pipe to ensure that it is well sealed and there are no loosening or leakage hazards. Use tools such as wrenches to tighten each connecting bolt and check and replace the sealing gasket if necessary. At the same time, carefully check whether the spray gun nozzle is unobstructed. If the nozzle is found to be clogged with debris, use a thin wire or a special nozzle cleaning tool to clear it to ensure that the spray material can be sprayed smoothly.

[0064] Hold the spray gun 30-50cm away from the base surface, with the spray angle perpendicular to the base surface. Test the atomization effect (fan-shaped spray surface width 50-80cm). Maintain a stable air pressure of 0.5MPa and monitor the air pressure stability in real time using a pressure gauge. During the commissioning process, test spray on a test panel with the same material as the old wall.

[0065] First, process complex parts such as corners, door and window openings (shorten the spray gun distance to 20-30cm), and then spray on a large area with a thickness of 3-5mm (1.2-1.5kg per square meter), ensuring that the burrs are evenly distributed (density ≥80 / 100cm 2 ). Turn on the high-pressure spraying machine and observe the spraying effect. According to the test spraying situation, adjust the spraying angle of the spray gun to ensure that the spraying material can evenly cover the surface of the test plate. At the same time, pay close attention to the atomization effect and discharge uniformity of the spraying material. If it is found that the spraying material is poorly atomized and sprayed out in blocks or streams, it may be due to insufficient air pressure, nozzle blockage or inappropriate material consistency. It is necessary to promptly troubleshoot and make corresponding adjustments. After multiple test spraying and parameter fine-tuning, formal construction can be carried out until the quality of the spraying meets the expected standards. It is strictly forbidden to repeatedly spray the roughened surface with a spray gun to avoid damaging the structure of the roughened layer. If it is found that the local roughening effect is not good, such as the burrs are too short or unevenly distributed, it is necessary to wait for the roughened layer to initially solidify, and then use manual repair methods to repair the defective parts with a trowel or a small spray gun.

[0066] Further, cement mortar was prepared in a ratio of 1:3 to obtain a bottom plaster layer;

[0067] Then, a plaster board is used to apply the plaster to the interface between the bottom plaster and the roughened layer for bonding to obtain the concrete wall surface.

[0068] In this embodiment, the bottom plaster is: 1:3 cement mortar (sand particle size ≤ 2mm) with a thickness of 5-7mm, compacted and roughened, and the bonding time with the roughened layer interface is controlled to 24-48 hours after spraying (strength of the roughened layer ≥ 1.2MPa).

[0069] Furthermore, a primer is evenly applied to enhance the adhesion of the concrete wall surface;

[0070] Select appropriate exterior wall paint and repair the finishing layer;

[0071] An ultrasonic detector is used to perform empty package detection to obtain the repaired wall surface.

[0072] In this embodiment, the method of applying exterior wall paint is adopted, and it is necessary to wait for the bottom plaster to be completely dry before proceeding. Generally, the bottom plaster drying time is about 7-10 days, and the specific time can be detected and judged by tools such as humidity detectors. Before applying the paint, first evenly apply a layer of the primer, which has the effect of sealing the wall surface and enhancing the adhesion of the topcoat. After the primer is dry (generally 1-2 days are required), the topcoat is applied. The topcoat should be applied evenly without dripping or leaking, ensuring that the wall color is uniform. If the method of pasting tiles is adopted, a special tile adhesive must be used. Before pasting the tiles, first evenly apply a layer of adhesive on the plaster layer surface, with a thickness controlled at 3-5mm, and then gently press the tiles on the adhesive. Use tools such as a level and a ruler to ensure that the tiles are flat and vertical, and the gaps between the tiles are uniform. The gap width is generally controlled between 2-5mm according to design requirements. After pasting is completed, the tiles are grouted. The grouting material should match the color of the tiles, and the grouting should be full and smooth to ensure that the tiles are firmly pasted and beautiful. Subsequently, the ultrasonic detector can be used to perform empty bag detection to obtain the repaired wall.

[0073] Corresponding to the aforementioned embodiment of the low-damage repair construction method for urban renewal of old walls, the present application also provides an embodiment of the low-damage repair construction equipment for urban renewal of old walls.

[0074] Figure 8 This is a schematic diagram of the structure of the low-damage repair construction equipment for urban renewal of old walls of the present invention. Figure 8 The equipment includes: a damage processing module 801, a pre-treatment base surface module 802, a shotcrete material preparation module 803, a roughening construction module 804, an enhanced maintenance module 805, a gray putty preparation module 806 and a finishing layer coating module 807. The pre-treatment base surface module 802 is connected to the damage processing module 801, the shotcrete material preparation module 803 is connected to the pre-treatment base surface module 802, the shotcrete material preparation module 803 is connected to the pre-treatment base surface module 802, the roughening construction module 804 is connected to the shotcrete material preparation module 803, the enhanced maintenance module 805 is connected to the roughening construction module 804, the gray putty preparation module 806 is connected to the enhanced maintenance module 805, and the finishing layer coating module 807 is connected to the gray putty preparation module 806.

[0075] In this embodiment, the pretreatment base surface module 802 is connected to the damage treatment module 801, the spraying material preparation module 803 is connected to the pretreatment base surface module 802, the spraying material preparation module 803 is connected to the pretreatment base surface module 802, the roughening construction module 804 is connected to the spraying material preparation module 803, the enhanced maintenance module 805 is connected to the roughening construction module 804, the gray putty preparation module 806 is connected to the enhanced maintenance module 805, and the finishing layer coating module 807 is connected to the gray putty preparation module 806. In this way, the old wall surface is repaired, overall changes are avoided, construction costs are reduced, and damage to the base structure is reduced.

[0076] Regarding the system in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0077] For the system embodiment, since it basically corresponds to the method embodiment, the relevant parts can be referred to the partial description of the method embodiment. The device embodiment described above is only schematic, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this application. A person of ordinary skill in the art can understand and implement it without paying any creative work.

[0078] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art that are not disclosed in this application.

[0079] It will be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A low-damage repair construction method for old wall surfaces in urban renewal, characterized in that: The steps include: Use tools to treat the damaged area to obtain a concrete base; Pre-treating the concrete base with auxiliary tools to obtain a clean concrete base; Using a mixing device to mix the shotcrete material to provide the shotcrete raw material for the clean concrete base; The prepared spraying raw material is extracted using a roughening device and sprayed on the clean concrete base to obtain a roughened layer; The roughened layer is cured and strengthened by using a vinyl film to obtain a qualified roughened layer interface; Using a stirring device to prepare gray putty, and then combining it with the roughened layer interface to obtain a concrete wall surface; Select and apply exterior wall paint on the concrete wall to obtain a repaired wall.

2. The low-damage repair construction method for old wall surfaces in urban renewal according to claim 1, characterized in that: In the step of using tools to process the damaged area to obtain a concrete base: Use thermal imaging to inspect the base layer and form repair boundaries for loose and damaged areas; The area formed by the repair boundary is manually struck with a hollow hammer to obtain the clean concrete base.

3. The low-damage repair construction method for old wall surfaces in urban renewal as claimed in claim 2, characterized in that: In the step of pre-treating the concrete base with auxiliary tools to obtain a clean concrete base: Use a broom to clean the wall thoroughly and remove debris attached to the surface; Use a high-pressure water gun mixed with neutral detergent to wash away dust and oil stains; A water-based penetrating interface agent is rolled to form a micro-anchoring structure to obtain the clean concrete base layer to be processed.

4. The low-damage repair construction method for old wall surfaces in urban renewal as claimed in claim 3 is characterized in that: In the step of using a mixing device to stir the shotcrete material to provide the shotcrete raw material for the clean concrete base: Prepare polyvinyl alcohol solution, cement and sand in a mass ratio of 0.3:1:1.5: Pour cement and sand into the forced mixer in sequence and dry mix them to make the two materials preliminarily mixed evenly: Then, the polyvinyl alcohol solution is added and stirred to obtain the spraying raw material.

5. The low-damage repair construction method for old wall surfaces in urban renewal according to claim 4 is characterized in that: In the step of using a roughening device to extract the prepared spraying raw material and spraying it on the clean concrete base to obtain a roughened layer: Carry out comprehensive and detailed debugging of the high-pressure shotcrete machine; The spraying raw material is poured into the high-pressure spraying machine to perform operation to obtain the roughened layer.

6. The low-damage repair construction method for old wall surfaces in urban renewal according to claim 5, characterized in that: In the step of using a stirring device to prepare gray putty, and then combining it with the roughened layer interface to obtain a concrete wall surface: Prepare cement mortar in a ratio of 1:3 to obtain a bottom plaster layer; Then, a plaster board is used to apply the plaster to the interface between the bottom plaster and the roughened layer for bonding to obtain the concrete wall surface.

7. The low-damage repair construction method for old wall surfaces in urban renewal according to claim 6, characterized in that: In the step of applying exterior wall paint to the concrete wall to obtain a repaired wall: First, evenly apply primer to enhance the adhesion of the concrete wall; Select appropriate exterior wall paint and repair the finishing layer; An ultrasonic detector is used to perform empty package detection to obtain the repaired wall surface.

8. A low-damage repair construction equipment for old wall surfaces during urban renewal, applied to the low-damage repair construction method for old wall surfaces during urban renewal as claimed in any one of claims 1 to 6, characterized in that: It includes a damage treatment module, a pretreatment base surface module, a spraying material preparation module, a roughening construction module, an enhanced maintenance module, a gray putty preparation module and a finishing layer coating module. The pretreatment base surface module is connected to the damage treatment module, the spraying material preparation module is connected to the pretreatment base surface module, the spraying material preparation module is connected to the pretreatment base surface module, the roughening construction module is connected to the spraying material preparation module, the enhanced maintenance module is connected to the roughening construction module, the gray putty preparation module is connected to the enhanced maintenance module, and the finishing layer coating module is connected to the gray putty preparation module.

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