CN110439313B - Thermal insulation exterior wall repairing process - Google Patents
Thermal insulation exterior wall repairing process Download PDFInfo
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- CN110439313B CN110439313B CN201910746492.1A CN201910746492A CN110439313B CN 110439313 B CN110439313 B CN 110439313B CN 201910746492 A CN201910746492 A CN 201910746492A CN 110439313 B CN110439313 B CN 110439313B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0203—Arrangements for filling cracks or cavities in building constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0296—Repairing or restoring facades
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Abstract
The invention relates to the technical field of external wall repair, in particular to a heat-insulating external wall repair process, which is characterized in that when a small amount of superficial shallow cracks appear on a finish coat, a reinforcing agent is injected at the cracks to enhance the strength of the finish coat around the cracks, and then adhesive mortar is injected into the cracks to repair the cracks; when a large amount of cracks appear on the veneer, the veneer layer is reworked, and anti-cracking fibers are added into the material of the veneer layer, so that the anti-cracking capability of the veneer layer is improved; when the heat-insulating layer has cracks, the cracks are expanded and then filled with the conjunction parts to provide sufficient elastic space for thermal expansion or contraction of the heat-insulating layer.
Description
Technical Field
The invention relates to the technical field of external wall repair, in particular to a heat-preservation external wall repair process.
Background
Since the last 90 s, China began to popularize and apply the external thermal insulation system of the thin-plastered external wall of the foam plastic thermal insulation board, has been applied to earlier multi-layer buildings for more than 20 years, and with the gradual increase of service life, most of the thermal insulation external walls which are put into use at early stage have the phenomena of cracking of a veneer layer, peeling and cracking of a thermal insulation layer, so that complaints caused by the phenomena are frequently generated, and accidents such as personal injuries, deaths, vehicle damages and the like are frequently generated. The outlet of the house and the repairing standard of the exterior wall external thermal insulation system of the building of the urban and rural construction department marks the problem that the country has paid high attention to the repairing of the exterior wall external thermal insulation, the hundred-year repairing and green houses enter a new normal state, the repairing of the exterior wall of the thermal insulation in the prior art is generally carried out by filling and repairing after mixing an adhesive and a base material, the repairing part cannot be well adhered to the original wall surface, the repaired wall surface can be cracked again on the basis of the original cracking in a short time, and the repeated repairing cost is high.
Disclosure of Invention
The heat-preservation external wall repairing process needs to make a specific repairing scheme according to different damage grades of the heat-preservation external wall, reduces repairing cost and prolongs the service life of the repaired heat-preservation wall.
The invention is realized by the following technical scheme:
a heat preservation outer wall repairing process, the heat preservation outer wall repairing process provides a repairing method aiming at three conditions of a small amount of superficial shallow cracks on a veneer, a large amount of cracks on the veneer and cracks on a heat preservation layer, the repairing method is convenient, and the service life of a heat preservation wall after repairing is obviously prolonged;
in particular, the method comprises the following steps of,
(1) when a small amount of superficial shallow cracks appear on the finish coat:
s1: removing impurities in the crack, injecting a reinforcing agent into the crack, and during injection, starting injection from the deepest part of the crack until the reinforcing agent overflows from the crack;
the reinforcing agent comprises the following components, by weight, 30-35 parts of polyurethane aqueous dispersion, 1-1.2 parts of polybutyl acrylate, 0.5-0.8 part of propylene glycol methyl ether propionate and 1-2 parts of polyethylene glycol;
the reinforcing agent can improve the strength grade of the veneer layer, so that the veneer layer is prevented from further peeling off due to impact force during the next drilling, the advantages of the components in the reinforcing agent are complementary, and the butyl polyacrylate can promote the reinforcing agent to quickly form a film after being added; the polyurethane aqueous dispersion forms a three-dimensional network structure in the curing process and is distributed on the surface of the finish coat at the crack, so that the strength of the finish coat at the crack is improved; propylene glycol methyl ether propionate can improve the permeability of the reinforcing agent and accelerate the action speed of the reinforcing agent; the polyethylene glycol and the conventional dispersant can uniformly disperse all components and ensure the overall action effect;
s2: completely airing the crack, drilling holes at the crack, wherein the depth of each hole is the thickness of a facing layer, the diameter of each hole is 0.3-0.35mm, the holes are distributed on the crack at equal intervals in the horizontal direction, the interval between every two adjacent holes in the horizontal direction is 10-11cm, injecting bonding mortar into the holes, during injection, starting injection from the deepest part of the crack until the bonding mortar overflows from the crack, and leveling the overflowing part by using a scraper;
the adhesive mortar consists of the following components in parts by weight, 20-25 parts of sandstone aggregate and 10-12 parts of adhesive;
the adhesive comprises the following components, by weight, 10-15 parts of polyurethane adhesive with the concentration of 20-25%, 0.6-0.8 part of asbestos powder, 6-9 parts of paraffin engine oil and 0.8-1 part of nonylphenol polyoxyethylene ether;
after the cracks are drilled, the bonding mortar is injected into the cracks, so that the contact area of the bonding mortar and the finish coat is increased, in addition, the bonding stability of the bonding mortar and the finish coat is improved due to the structure that the holes are combined with the cracks, and the cracks are not easy to crack after filling;
the adhesive is added into the sandstone aggregate, so that the adhesion of the sandstone aggregate can be improved;
the components in the adhesive component play a complementary role, the polyurethane adhesive with the concentration of 20-25% plays a role in bonding, and the asbestos powder can accelerate the solidification of the bonding mortar; the paraffin oil can improve the wettability and the fluidity of the adhesive; the nonylphenol polyoxyethylene ether can improve the tensile strength of the adhesive;
(2) when the veneer has a large number of cracks:
removing the decorative layer, reworking the decorative layer, and adding 6-8 wt% of anti-crack fibers into the decorative layer material, wherein the anti-crack fibers are modified polypropylene fibers, and the length of the anti-crack fibers is 12-15 mm;
the length-diameter ratio of the modified polypropylene fiber is 120-130, and the modified polypropylene fiber is processed by soaking the polypropylene fiber in aqueous acrylic resin emulsion at 80-90 ℃ for 20-25 minutes.
6-8% of anti-cracking fiber is added into the facing layer material, and the anti-cracking fiber can involve the facing layer material and can obviously improve the anti-cracking capability of the facing layer;
(3) when the heat preservation layer cracks:
removing impurities in the crack, cutting off the heat insulation layer within the range of 1-1.5cm at two sides of the crack to form a filling space, placing a fitting piece in the filling space, wherein the fitting piece is matched with the filling space in size and shape, and bonding the fitting piece and the heat insulation layer into a whole by using an adhesive, and adhering high-elasticity rubber and plastic sheets on two end faces of the fitting piece, which are in contact with the heat insulation layer.
High-elasticity rubber-plastic sheets are adhered to two end faces of the conjunction piece, and when the heat-insulating layer material is preheated and expanded, the high-elasticity rubber sheets can be compressed along with the heat-insulating layer material, so that expansion and contraction spaces are reserved for the heat-insulating layer material, and the cracking phenomenon of the heat-insulating layer caused by expansion and contraction is avoided.
The invention has the advantages that different repairing modes are respectively adopted according to the specific cracking condition of the thermal insulation outer wall, the repairing effect is ensured, the repairing cost is greatly reduced, the repairing time is short, the adhesive property of the sandstone aggregate and the decorative layer can be obviously improved by improving the adhesive according to the condition that a small amount of superficial shallow cracks appear on the decorative layer, the influence of thermal expansion and cold contraction on the cracks is reduced, the crack resistance of the decorative layer is enhanced, the crack resistant fiber is added into the material of the decorative layer according to the condition that a large amount of cracks appear on the decorative layer, the connectivity among the material particles of the decorative layer can be improved by adding the crack resistant fiber, the particles of the decorative layer are adhered on the crack resistant fiber and are not easy to split, the crack resistant performance of the newly-made decorative layer is obviously improved, and the crack of the thermal insulation layer is filled by utilizing a combined part, the repairing mode is simple, the repairing effect is ensured, the influence of the crack resistance of the decorative layer is reduced, the crack resistance of the decorative layer is improved, The heat-insulating layer is convenient and fast, and meanwhile, a certain elastic shrinkage expansion space is provided for the heat-insulating layer, so that the crack resistance of the heat-insulating layer is improved.
Drawings
FIG. 1 is a schematic view of a repair method when a small amount of superficial shallow cracks appear in a finish layer;
FIG. 2 is a schematic view of a fitting structure according to the present invention.
Detailed Description
The present invention is further described in the following with reference to the detailed description, the following examples are only a part of examples of the present invention, and not all examples, and other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
A heat preservation outer wall repairing process, the heat preservation outer wall repairing process provides a repairing method aiming at three conditions of a small amount of superficial shallow cracks on a veneer, a large amount of cracks on the veneer and cracks on a heat preservation layer, the repairing method is convenient, and the service life of a heat preservation wall after repairing is obviously prolonged;
in particular, the method comprises the following steps of,
(1) when a small amount of superficial shallow cracks appear on the finish coat:
s1: removing impurities in the crack, injecting a reinforcing agent into the crack, and during injection, starting injection from the deepest part of the crack until the reinforcing agent overflows from the crack;
the reinforcing agent comprises the following components, by weight, 32 parts of polyurethane aqueous dispersion, 1.15 parts of polybutyl acrylate, 0.6 part of propylene glycol methyl ether propionate and 1.3 parts of polyethylene glycol;
the reinforcing agent can improve the strength grade of the veneer layer, so that the veneer layer is prevented from further peeling off due to impact force during the next drilling, the advantages of the components in the reinforcing agent are complementary, and the butyl polyacrylate can promote the reinforcing agent to quickly form a film after being added; the polyurethane aqueous dispersion forms a three-dimensional network structure in the curing process and is distributed on the surface of the finish coat at the crack, so that the strength of the finish coat at the crack is improved; propylene glycol methyl ether propionate can improve the permeability of the reinforcing agent and accelerate the action speed of the reinforcing agent; the polyethylene glycol and the conventional dispersant can uniformly disperse all components and ensure the overall action effect;
taking a gypsum board facing layer with the thickness of 12mm as an experimental object, randomly extracting 12 measuring points within 0.5cm of the crack of the gypsum facing to detect the compressive strength of the gypsum facing, averaging to obtain the average value of the compressive strength within 0.5cm of the crack of the gypsum facing of 4.2MPa, treating the crack of the facing layer according to the step S1, after finishing treatment for 15 hours, randomly extracting 12 measuring points within 0.5cm of the crack of the gypsum facing to detect the compressive strength of the gypsum facing, averaging to obtain the average value of the compressive strength within 0.5cm of the crack of the gypsum facing of 7.1 MPa;
s2: specifically, as shown in fig. 1, after the crack 1 is completely dried, drilling holes 2 in the crack 1, wherein the depth of each hole 2 is the thickness of a facing layer, the aperture of each hole 2 is 0.3mm, the holes 2 are distributed on the crack 1 at equal intervals in the horizontal direction, the interval between every two adjacent holes in the horizontal direction is 11cm, injecting bonding mortar into the holes 2, during injection, injecting from the deepest part of the crack 1 until the bonding mortar overflows from the crack 1, and leveling the overflowing part by using a scraper;
the adhesive mortar consists of the following components in parts by weight, 22 parts of sandstone aggregate and 10 parts of adhesive;
the adhesive comprises the following components in parts by weight, 13 parts of 23% polyurethane adhesive, 0.65 part of asbestos powder, 7 parts of paraffin engine oil and 0.9 part of nonylphenol polyoxyethylene ether;
after the cracks are drilled, the bonding mortar is injected into the cracks, so that the contact area of the bonding mortar and the finish coat is increased, in addition, the bonding stability of the bonding mortar and the finish coat is improved due to the structure that the holes are combined with the cracks, and the cracks are not easy to crack after filling;
the adhesive is added into the sandstone aggregate, so that the adhesion of the sandstone aggregate can be improved;
the components in the adhesive component play a complementary role, the polyurethane adhesive with the concentration of 22 percent plays a role in bonding, and the asbestos powder can accelerate the solidification of the bonding mortar; the paraffin oil can improve the wettability and the fluidity of the adhesive; the nonylphenol polyoxyethylene ether can improve the tensile strength of the adhesive;
(2) when the veneer has a large number of cracks:
removing the decorative layer, reworking the decorative layer, and adding 7 wt% of anti-crack fibers into the decorative layer material, wherein the anti-crack fibers are modified polypropylene fibers, and the length of the modified polypropylene fibers is 13 mm;
the length-diameter ratio of the modified polypropylene fiber is 125, and the modified polypropylene fiber is processed by soaking the polypropylene fiber in aqueous acrylic resin emulsion at the temperature of 85 ℃ for 24 minutes during manufacturing.
The anti-cracking fibers with the weight ratio of 7 percent are added in the facing layer material, and the anti-cracking fibers can be used for holding the facing layer material, so that the facing layer material particles are not easy to separate, and the anti-cracking capability of the facing layer can be obviously improved;
taking polypropylene fibers with the length-diameter ratio of 125 and the length of 12mm as experimental objects, randomly drawing 20 polypropylene fibers before treatment, detecting to obtain the average tensile strength of the polypropylene fibers of 78MPa, soaking the 20 polypropylene fibers in aqueous acrylic resin emulsion for treatment at the treatment temperature of 85 ℃ for 22 minutes, drying after treatment, detecting again to obtain the average tensile strength of the polypropylene fibers of 122 MPa;
(3) when the heat preservation layer cracks:
as shown in figure 2, impurities in the cracks are removed, the heat-insulating layers within the range of 1.2cm at the two sides of the cracks are cut off to form filling spaces, conjunction pieces 3 which are matched with the filling spaces in size and shape are placed in the filling spaces and are bonded into a whole by using an adhesive, and high-elasticity rubber and plastic sheets 4 are adhered to the two end faces of the conjunction pieces 3, which are in contact with the heat-insulating layers.
High-elasticity rubber-plastic sheets 4 are adhered to two end faces of the conjunction piece 3, when the heat-insulating layer material is preheated and expanded, the high-elasticity rubber sheets 4 can be compressed along with the heat-insulating layer material, an expansion space is reserved for the heat-insulating layer material, and the phenomenon that the heat-insulating layer is cracked due to expansion is avoided.
The above embodiments are merely technical ideas and features of the present invention, and thus should not limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of the present invention.
Claims (5)
1. A heat-preservation external wall repairing process, in particular,
(1) when a small amount of superficial shallow cracks appear on the finish coat:
s1: removing impurities in the crack, injecting a reinforcing agent into the crack, and during injection, starting injection from the deepest part of the crack until the reinforcing agent overflows from the crack;
the reinforcing agent comprises the following components, by weight, 30-35 parts of polyurethane aqueous dispersion, 1-1.2 parts of polybutyl acrylate, 0.5-0.8 part of propylene glycol methyl ether propionate and 1-2 parts of polyethylene glycol;
s2: when the crack is completely dried, drilling holes at the crack, wherein the holes are distributed on the crack at equal intervals in the horizontal direction, injecting bonding mortar into the holes, wherein during injection, the injection is started from the deepest part of the crack until the bonding mortar overflows from the crack, and the overflowing part is leveled by a scraper;
the adhesive mortar consists of the following components in parts by weight, 20-25 parts of sandstone aggregate and 10-12 parts of adhesive;
the adhesive comprises the following components, by weight, 10-15 parts of polyurethane adhesive with the concentration of 20-25%, 0.6-0.8 part of asbestos powder, 6-9 parts of paraffin engine oil and 0.8-1 part of nonylphenol polyoxyethylene ether;
(2) when cracks appear on the veneer:
removing the decorative layer, reworking the decorative layer, and adding 6-8% of anti-crack fibers in percentage by weight into the material of the decorative layer, wherein the anti-crack fibers are modified polypropylene fibers;
when the modified polypropylene fiber is manufactured, the polypropylene fiber is soaked in the water-based acrylic resin emulsion for treatment, the treatment temperature is 80-90 ℃, and the treatment time is 20-25 minutes;
(3) when the heat preservation layer cracks:
removing impurities in the crack, cutting off the heat insulation layer within the range of 1-1.5cm at two sides of the crack to form a filling space, placing a fitting piece in the filling space, wherein the fitting piece is matched with the filling space in size and shape, and bonding the fitting piece and the heat insulation layer into a whole by using an adhesive, and adhering high-elasticity rubber and plastic sheets on two end faces of the fitting piece, which are in contact with the heat insulation layer.
2. The thermal insulation exterior wall repairing process according to claim 1,
the depth of the drilled hole is the thickness of the facing layer, the aperture is 0.3-0.35mm, and the horizontal distance between two adjacent holes is 10-11 cm.
3. The thermal insulation exterior wall repairing process according to claim 1,
the length of the anti-crack fiber is 12-15mm, and the length-diameter ratio is 120-130.
4. The thermal insulation exterior wall repairing process according to claim 1,
the reinforcing agent comprises, by weight, 30 parts of polyurethane aqueous dispersion, 1 part of polybutyl acrylate, 0.5 part of propylene glycol methyl ether propionate and 1 part of polyethylene glycol.
5. The thermal insulation exterior wall repairing process according to claim 1,
the adhesive comprises the following components, by weight, 10 parts of 20% polyurethane adhesive, 0.6 part of asbestos powder, 6 parts of paraffin engine oil and 0.8 part of nonylphenol polyoxyethylene ether.
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| CN106812220A (en) * | 2017-03-14 | 2017-06-09 | 中国十七冶集团有限公司 | External wall insulation crack reparation construction method |
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| CN109356395A (en) * | 2018-09-03 | 2019-02-19 | 天津禾盛源新材料科技有限公司 | A kind of perfusion mortar method exterior-wall heat insulation repairerment technique |
| CN109944455A (en) * | 2017-12-21 | 2019-06-28 | 新昌县鼎绑机电有限公司 | A kind of building masonry wall method for repairing crack |
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2019
- 2019-08-14 CN CN201910746492.1A patent/CN110439313B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101963591A (en) * | 2010-08-13 | 2011-02-02 | 上海市建筑科学研究院(集团)有限公司 | Detection and evaluation method of crack condition on external insulating layer of thin-plastered outer wall |
| CN104032972A (en) * | 2013-07-02 | 2014-09-10 | 贵州中建建筑科研设计院有限公司 | Method for repairing cracks of thermal mortar of outer wall |
| CN106812220A (en) * | 2017-03-14 | 2017-06-09 | 中国十七冶集团有限公司 | External wall insulation crack reparation construction method |
| CN109944455A (en) * | 2017-12-21 | 2019-06-28 | 新昌县鼎绑机电有限公司 | A kind of building masonry wall method for repairing crack |
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