Construction method for preventing external wall thermal insulation mortar from falling off

Abstract

The invention relates to the technical field of building construction, in particular to an outer wall thermal insulation mortar anti-falling construction method which comprises the following steps: S01, building outer wall base layer treatment; s02, the contact area of the building outer wall base layer and the thermal insulation mortar coating is increased; s03, uniformly spraying a nano silane interface agent; s04, uniformly spraying a water-borne epoxy resin adhesive; s05, constructing a bottom anchoring layer; s06, constructing a middle thermal insulation layer; s07, constructing a surface protection layer; s08, constructing a temperature deformation joint; s09, detecting a finished product; according to the device, workers can be assisted in accurately placing the transverse steel bars and the longitudinal steel bars, the distances between the adjacent transverse steel bars and the distances between the adjacent longitudinal steel bars are equal, the problem that the sizes of meshes of welded steel bar meshes are different due to rolling of the longitudinal steel bars in the transferring process can be solved, and the quality of the welded steel bar meshes is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, in particular to a construction method for preventing exterior wall thermal insulation mortar from falling off. Background Art

[0002] Thermal insulation mortar is a premixed dry mortar made by mixing various lightweight materials as aggregates, cement as a binder, and some modified additives. It is mainly used for building exterior wall insulation. The existing exterior wall insulation mortar construction method includes the following steps: Step 1: Base layer preparation and application of interface agent; Step 2: Mortar mixing and laying; Step 3: Curing the wall surface after laying for at least 7 days. However, in actual operation, this construction method requires a high level of operator experience. If it is not handled properly, hollows will form between the thermal insulation mortar coating and the exterior wall, causing the thermal insulation mortar coating to easily separate from the exterior wall, reducing the thermal insulation effect of the building exterior wall. Summary of the Invention

[0003] The purpose of the present invention is to address the above-mentioned shortcomings and provide a construction method for preventing exterior wall insulation mortar from falling off. By increasing the contact area between the exterior wall of the building and the insulation mortar coating, the adhesion effect of the insulation mortar coating is improved, the situation where the insulation mortar coating is extremely easy to fall off is avoided, and the insulation effect of the exterior wall of the building is improved.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The construction method for preventing the exterior wall thermal insulation mortar from falling off comprises the following steps:

[0006] S01. Treatment of building exterior wall base: Sandblast the building exterior wall base to Sa2.5 level;

[0007] S02. Increase the contact area between the building's exterior wall base and the thermal insulation mortar coating: Use high-pressure water jet equipment to spray multiple concave and convex textures on the wall surface, thereby increasing the contact area between the building's exterior wall base and the thermal insulation mortar coating;

[0008] S03. Evenly spray the nano-silane interface agent; the nano-scale molecules of the nano-silane interface agent penetrate into the pores of the base layer of the building's exterior wall to form a chemical anchoring layer;

[0009] S04. Evenly spray water-based epoxy resin adhesive: After the nano-silane interface agent is dry, evenly apply a layer of water-based epoxy resin adhesive to further enhance the interface adhesion;

[0010] S05. Construct the bottom anchoring layer: Use thermal insulation mortar with added chopped basalt fiber (the amount is 0.3%-0.5% of the mortar mass) and redispersible latex powder (the amount is 2%-3% of the mortar mass), and apply it to a thickness of 8-10mm;

[0011] S06. Construct the middle insulation layer: After the bottom anchoring layer solidifies, apply the main insulation mortar according to the design insulation requirements. The thickness of each layer should be controlled at 15-20mm. Leave 24 hours between layers to ensure that the lower layer is fully dry.

[0012] S07. Construct the surface protective layer: Use polymer anti-cracking thermal insulation mortar, add nano-scale titanium dioxide fiber (the dosage is 0.2% of the mortar mass), with a thickness of 5-8mm. Immediately after construction, press in alkali-resistant glass fiber mesh cloth, and the overlap width of the alkali-resistant glass fiber mesh cloth should be no less than 100mm;

[0013] S08. Construct temperature deformation joints: Open temperature deformation joints with a spacing of ≤6m and fill with polyurethane sealant;

[0014] S09. Finished product inspection: Use adhesion tester to conduct on-site pull-out test; infrared thermal imaging to detect hollowing rate;

[0015] Furthermore, in step S02, the depth of the concave-convex texture ranges from 3 to 5 mm, and the spacing is from 10 to 15 mm.

[0016] Furthermore, in step S04, the coating thickness of the water-based epoxy resin adhesive is 0.5 mm.

[0017] Furthermore, in step S05, during construction, a serrated spatula is used to roughen the surface at a 45° angle to form a barbed structure to enhance interlayer engagement.

[0018] Furthermore, in step S05, after the thermal insulation mortar is applied, customized plastic anchor bolts are immediately inserted, with an anchor bolt spacing of 300×300 mm and a depth of 60-80 mm into the base wall.

[0019] Furthermore, in step S06, a bionic anchoring mesh is laid at intervals in the thermal insulation mortar layer. The mesh is woven from high-strength basalt fibers and coated with a bionic adhesive coating on the surface. The overall structural stability is improved through the dual effects of mechanical anchoring and molecular bonding.

[0020] The beneficial effects of the present invention are:

[0021] During use, the base layer of the building exterior wall is treated to clean impurities on the base layer of the building exterior wall, thereby enhancing interfacial bonding. The multiple concave-convex textures formed by spraying increase the contact area between the base layer of the building exterior wall and the thermal insulation mortar coating. The bonding ability of the thermal insulation mortar is improved by using a nano-silane interface agent and a water-based epoxy resin adhesive. The thermal insulation mortar has crack resistance, durability, impact resistance and sun protection effects through the bottom anchoring layer, the middle thermal insulation layer and the surface protective layer, thereby extending its service life. Thermal expansion and contraction deformation is buffered by constructing temperature deformation joints to prevent stress concentration damage. The molding results are detected by an adhesion tester and infrared thermal imaging. According to tests, compared with the traditional process, the wind pressure resistance is improved to 5.0 kPa, and the bonding strength attenuation rate under wet and hot cycle conditions is reduced by 62%. Although the overall cost is increased, the service life is extended by 8-10 years, which is more practical and more cost-effective. The present invention increases the contact area between the building exterior wall and the thermal insulation mortar coating, improves the adhesion effect of the thermal insulation mortar coating, avoids the situation where the thermal insulation mortar coating is extremely easy to detach, and improves the thermal insulation effect of the building exterior wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a diagram of the method steps of the present invention; DETAILED DESCRIPTION

[0023] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0024] like Figure 1 As shown, the construction method for preventing the exterior wall thermal insulation mortar from falling off comprises the following steps: S01, treating the base layer of the exterior wall of the building: sandblasting the base layer of the exterior wall of the building to Sa2.5 level;

[0025] S02. Increase the contact area between the building's exterior wall base and the thermal insulation mortar coating: Use high-pressure water jet equipment to spray multiple concave and convex textures on the wall surface, thereby increasing the contact area between the building's exterior wall base and the thermal insulation mortar coating;

[0026] S03. Evenly spray the nano-silane interface agent; the nano-scale molecules of the nano-silane interface agent penetrate into the pores of the base layer of the building's exterior wall to form a chemical anchoring layer;

[0027] S04. Evenly spray water-based epoxy resin adhesive: After the nano-silane interface agent is dry, evenly apply a layer of water-based epoxy resin adhesive to further enhance the interface adhesion;

[0028] S05. Construct the bottom anchoring layer: Use thermal insulation mortar with added chopped basalt fiber (the addition amount is 0.3%-0.5% of the mortar mass) and redispersible latex powder (the addition amount is 2%-3% of the mortar mass), and apply it with a thickness of 8-10mm; among them, the physical reinforcement effect of adding chopped basalt fiber improves the crack resistance, durability and impact resistance of the thermal insulation mortar. The fiber forms a three-dimensional network support in the early stage of mortar solidification, disperses shrinkage stress, reduces the early generation of microcracks, and the crack control rate can reach up to 62%. After the fiber is bonded to the binder, it prevents cracks from penetrating through through the "bridging effect" when subjected to stress, thereby improving the toughness of the mortar; adding redispersible latex powder can improve the interfacial bonding strength. The latex particles migrate to the substrate interface during the mortar curing process, forming a polymer film to bridge the base surface gaps, so that the bonding strength is increased to 2.33 times that of ordinary mortar, further preventing the thermal insulation mortar coating from falling off after forming.

[0029] S06. Construct the middle insulation layer: After the bottom anchoring layer solidifies, apply the main insulation mortar according to the design insulation requirements. The thickness of each layer should be controlled at 15-20mm. Leave 24 hours between layers to ensure that the lower layer is fully dry.

[0030] S07. Construct a surface protective layer: Use polymer anti-cracking thermal insulation mortar, add nano-scale titanium dioxide fiber (the dosage is 0.2% of the mortar mass), with a thickness of 5-8mm, and immediately press in alkali-resistant glass fiber mesh cloth after construction. The overlap width of the alkali-resistant glass fiber mesh cloth is not less than 100mm; among them, nano-scale titanium dioxide can absorb more than 95% of ultraviolet rays (UVA / UVB), blocking the damage of ultraviolet rays to polymer molecular chains, and extending the weathering life of the mortar by 2-3 times. Nanoparticles fill cement-based micropores (pore diameter is reduced by 30% to 50%), and can also improve the density and bonding strength of the thermal insulation mortar. Combined with the mesh cloth, a three-dimensional skeleton is formed in the mortar, which evenly disperses the shrinkage stress and temperature stress to the entire wall surface, significantly reducing the risk of cracks. The plastic shrinkage crack reduction rate is ≥60%. The fiber mesh blocks the crack penetration path, refines wide cracks into micro cracks (width <0.1mm), and improves the overall crack resistance of the system.

[0031] S08. Construct temperature deformation joints: Open temperature deformation joints with a spacing of ≤6m and fill with polyurethane sealant;

[0032] S09. Finished product inspection: On-site pull-out test was conducted using an adhesion tester (standard value ≥ 0.25MPa); hollowing rate was detected using infrared thermal imaging (control < 3%). Compared with traditional processes, wind pressure resistance was improved to 5.0kPa, and the bonding strength attenuation rate under wet and hot cycle conditions was reduced by 62%. The overall cost increased by approximately RMB 15 / m 2 , but the service life is extended by 8-10 years.

[0033] like Figure 1As shown, in step S02, the depth range of the concave-convex texture is 3-5 mm, and the spacing is 10-15 mm. In this embodiment, the microstructure of the barnacle attachment surface is simulated by the concave-convex texture with a depth range of 3-5 mm and a spacing of 10-15 mm, thereby increasing the contact area between the building exterior wall base and the thermal insulation mortar coating and improving the mechanical bite force.

[0034] like Figure 1 As shown, in step S04, the coating thickness of the water-based epoxy resin adhesive is 0.5 mm. In this embodiment, the water-based epoxy resin adhesive with a thickness of 0.5 mm is moderate in thickness and can further enhance the interfacial bonding force.

[0035] like Figure 1 As shown, in step S05, during construction, a serrated spatula is used to roughen the surface at a 45° angle to form a barbed structure to enhance interlayer engagement.

[0036] like Figure 1 As shown, in step S05, after the thermal insulation mortar is applied, customized plastic anchor bolts (spiral-shaped with barbs on the surface) are immediately inserted, with an anchor bolt spacing of 300×300 mm and a depth of 60-80 mm into the base wall.

[0037] like Figure 1 As shown, in step S06, a bionic anchoring mesh is laid at intervals in the thermal insulation mortar layer. The mesh is woven from high-strength basalt fibers and coated with a bionic adhesive coating (a material that imitates the van der Waals force of a gecko's paw) on the surface. The overall structural stability is improved through the dual effects of mechanical anchoring and molecular bonding.

[0038] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them with similar methods without departing from the scope defined by the spirit of the present invention.

Claims

1. The construction method for preventing exterior wall thermal insulation mortar from falling off is characterized by: The following steps are involved: S01. Treatment of building exterior wall base: Sandblast the building exterior wall base to Sa2.5 level; S02. Increase the contact area between the building's exterior wall base and the thermal insulation mortar coating: Use high-pressure water jet equipment to spray multiple concave and convex textures on the wall surface, thereby increasing the contact area between the building's exterior wall base and the thermal insulation mortar coating; S03. Evenly spray the nano-silane interface agent; the nano-scale molecules of the nano-silane interface agent penetrate into the pores of the base layer of the building's exterior wall to form a chemical anchoring layer; S04. Evenly spray water-based epoxy resin adhesive: After the nano-silane interface agent is dry, evenly apply a layer of water-based epoxy resin adhesive to further enhance the interface adhesion; S05. Construct the bottom anchoring layer: Use thermal insulation mortar with added chopped basalt fiber (the amount is 0.3%-0.5% of the mortar mass) and redispersible latex powder (the amount is 2%-3% of the mortar mass), and apply it to a thickness of 8-10mm; S06. Construct the middle insulation layer: After the bottom anchoring layer solidifies, apply the main insulation mortar according to the design insulation requirements. The thickness of each layer should be controlled at 15-20mm. Leave 24 hours between layers to ensure that the lower layer is fully dry. S07. Construct the surface protective layer: Use polymer anti-cracking thermal insulation mortar, add nano-scale titanium dioxide fiber (the dosage is 0.2% of the mortar mass), with a thickness of 5-8mm. Immediately after construction, press in alkali-resistant glass fiber mesh cloth, and the overlap width of the alkali-resistant glass fiber mesh cloth should be no less than 100mm; S08. Construct temperature deformation joints: Open temperature deformation joints with a spacing of ≤6m and fill with polyurethane sealant; S09. Finished product inspection: Use adhesion tester to conduct on-site pull-out test; infrared thermal imaging to detect hollowing rate.

2. The construction method for preventing exterior wall thermal insulation mortar from falling off according to claim 1, characterized in that: In step S02 , the depth of the concave-convex texture ranges from 3 to 5 mm, and the spacing is from 10 to 15 mm.

3. The construction method for preventing exterior wall thermal insulation mortar from falling off according to claim 1, characterized in that: In step S04, the coating thickness of the water-based epoxy resin adhesive is 0.5 mm.

4. The construction method for preventing exterior wall thermal insulation mortar from falling off according to claim 1, characterized in that: In step S05, during construction, a serrated spatula is used to roughen the surface at a 45° angle to form a barbed structure to enhance interlayer engagement.

5. The construction method for preventing exterior wall thermal insulation mortar from falling off according to claim 1, characterized in that: In step S05, after the thermal insulation mortar is applied, customized plastic anchor bolts are immediately inserted, with a spacing of 300×300 mm and a depth of 60-80 mm into the base wall.

6. The construction method for preventing exterior wall thermal insulation mortar from falling off according to claim 1, characterized in that: In step S06, bionic anchoring meshes are laid at intervals in the thermal insulation mortar layer. The meshes are woven from high-strength basalt fibers and coated with a bionic adhesive coating on the surface. The overall structural stability is improved through the dual effects of mechanical anchoring and molecular bonding.

Images