Construction method for reinforcing and repairing brick wall

Abstract

The invention belongs to the technical field of building structure repairing, and particularly relates to a construction method for reinforcing and repairing a brick wall. The invention provides a construction method for reinforcing and repairing a brick wall. The construction method comprises the following steps that (1) grooving treatment is conducted on a to-be-repaired area of the brick wall; (2) filling a repairing material into the groove; the repairing material comprises cement mortar, fine aggregate concrete or bricks; the cement mortar comprises epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester; (3) carrying out hydrophobic treatment on the filled brick wall by adopting a water repellent; the water repellent is prepared from organic silicon, a polymer and an additive, and the mass ratio of the organic silicon to the polymer to the additive is (13.4 to 17.8) to (34.4 to 52.4) to (11 to 32.5). The brick wall reinforced and repaired through the construction method is wide in application range, high in strength and good in durability, the historical aesthetic feeling is kept under the condition that the problems of wall cracks and weathering are solved, and the stability of the wall is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building structure repair, and in particular relates to a construction method for reinforcing and repairing a brick wall. Background Art

[0002] With the rapid development of urban construction and the passage of time, many old buildings, especially those with brick wall structures, are facing serious damage and aging problems. These old brick walls, due to long-term influence of the natural environment (such as wind and rain erosion, temperature changes, etc.) and human factors (such as improper use, design defects, etc.), will crack, deform, and peel off, which seriously threatens the safety and stability of the building.

[0003] In view of the cracks and weathering problems of old brick walls, reinforcement and repair are needed to ensure the stability and safety of the structure. The traditional reinforcement and repair method is to add a high-strength concrete or grouting material surface layer for reinforcement. The reinforcement thickness should not be too thick, otherwise the concrete pouring will be difficult to vibrate and compact. At the same time, traditional reinforcement cannot guarantee the visual quality after pouring, and also changes the original structural style. Traditional repair methods often have poor results. It is difficult to retain the original structural style while solving the problems of wall cracks and weathering, and the stability of the repaired wall is poor. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects in the prior art that it is not possible to solve the wall cracks and weathering problems and improve the wall stability while retaining the original structural style, thereby providing a construction method for brick wall reinforcement and repair.

[0005] To this end, the present invention provides the following technical solutions.

[0006] The present invention provides a construction method for reinforcing and repairing a brick wall, comprising the following steps:

[0007] (1) Perform grooving in the area to be repaired on the brick wall;

[0008] (2) filling the groove with a repair material; the repair material includes cement mortar, fine stone concrete or brick; the cement mortar includes epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester;

[0009] (3) A water-repellent agent is used to perform water-repellent treatment on the filled brick wall; the water-repellent agent comprises silicone, polymer and additive, and the mass ratio of silicone, polymer and additive is (13.4-17.8):(34.4-52.4):(11-32.5).

[0010] The grooving process can be performed by selecting appropriate tools according to the conventional techniques in the art, and the depth and width of the grooving can be determined according to the width and depth of the cracks in the brick wall, and the material and structure of the brick wall;

[0011] In an optional embodiment, the step (1) further includes a surface treatment step before the grooving process on the brick wall, and the surface treatment specifically includes: trimming irregular parts and / or obvious damage on the surface of the brick wall;

[0012] The purpose of surface preparation is to provide a smooth, solid repair base to facilitate subsequent steps;

[0013] In an optional embodiment, the surface treatment further includes cleaning, and the specific steps of cleaning include: removing impurities such as dust and oil stains on the surface of the brick wall;

[0014] The purpose of cleaning is to ensure that the material in the filling material in step (2) can be well adhered to the surface of the brick wall;

[0015] In an optional embodiment, the step (3), after the hydrophobic treatment, further comprises an inspection step;

[0016] In an optional embodiment, the inspection further includes the steps of trimming and painting;

[0017] The purpose of said finishing and painting is to improve the appearance and performance of the repaired brick wall;

[0018] In an optional embodiment, the organosilicon includes at least one of methyl silicone oil and active polysiloxane;

[0019] Reactive polysiloxane is a type of siloxane polymer with active functional groups. Polysiloxane is a type of polymer compound formed by silicon (Si) and oxygen (O) atoms connected by silicon-oxygen bonds (Si-O). Compared with conventional polysiloxanes, reactive polysiloxanes have stronger chemical reactivity. Their main feature is that they contain functional groups (such as amino, hydroxyl, olefin groups, etc.) that can react with other molecules.

[0020] In an optional embodiment, the polymer includes at least one of polyvinyl alcohol, polyvinyl ester, styrene acrylic emulsion and epoxy resin;

[0021] In an optional embodiment, the additive includes at least one of potassium aluminum sulfate, stearic acid, octylphenol polyoxyethylene ether, hydroxymethyl cellulose, tetraethyl silicate and isopropyl alcohol.

[0022] In an optional embodiment, the water repellent further comprises a solvent;

[0023] Preferably, the mass ratio of the solvent to the silicone is (12-18):(13.4-17.8);

[0024] Preferably, the solvent comprises paraffin. It should be noted that the paraffin is liquid paraffin.

[0025] The present invention provides a preferred water repellent solution, comprising paraffin, polyvinyl alcohol, polyvinyl ester, methyl silicone oil, potassium aluminum sulfate, styrene acrylic emulsion, tetraethyl silicate, stearic acid, epoxy resin, active polysiloxane, octylphenol polyoxyethylene ether, carboxymethyl cellulose and isopropyl alcohol in a mass ratio of (12-18):(20-30):(2.5-3.5):(12-16):(0-3.5):(8-12):(2.8-3.4):(1.0-5.5):(1.1-3.5):(1.4-1.8):(0-3.5):(4-16):(0-4). The water repellent includes a case where potassium aluminum sulfate and / or isopropyl alcohol and / or octylphenol polyoxyethylene ether are not contained.

[0026] In an optional embodiment, in the step (1), the crack in the area to be repaired is ≤3 mm, a U-shaped groove is opened along the crack, the groove depth of the U-shaped groove is ≥15 mm, and the groove width of the U-shaped groove is ≥20 mm.

[0027] In an optional embodiment, in step (1), if the crack of the area to be repaired is 3 mm < ≤ 10 mm, a hole is drilled along the crack, a pin is made, and a U-shaped groove is opened along the crack, wherein the groove depth of the U-shaped groove is ≥ 15 mm, and the groove width of the U-shaped groove is ≥ 20 mm;

[0028] Preferably, the parameters of the pin key specifically include: the pin key diameter is 25-50mm, the pin key spacing is 250-300mm, and the spacing refers to the distance along the longitudinal direction of the wall; the pin key depth is 20-25mm less than the thickness of the area to be repaired. It should be noted that the pin key depth refers to the distance the pin key enters the area to be repaired until it stops moving forward; the thickness of the area to be repaired refers to the thickness of the brick wall;

[0029] In an optional embodiment, in step (1), the weathered thickness or damaged diameter of the area to be repaired is ≥100 mm, and bricks are used for repairing; it should be noted that the weathered thickness of the area to be repaired refers to the thickness of the damaged area caused by weathering in the area to be repaired, which is different from the thickness of the area to be repaired;

[0030] Preferably, the bricks include bricks with a strength level of ≥ MU10, wherein MU is a strength grade code of the brick.

[0031] In an optional implementation manner, the groove depth of the U-shaped groove is ≤50 mm, and the crack is filled with cement mortar;

[0032] Preferably, the mass ratio of the epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester is 1:(1.4-1.5):(3-3.5):(0.1-0.12):(0.1-0.13).

[0033] In an optional implementation manner, the groove depth of the U-shaped groove satisfies: 50mm<the groove depth of the U-shaped groove≤100mm, the formwork is supported, and then fine stone concrete is poured;

[0034] Preferably, the fine stone concrete comprises water, cement and aggregate;

[0035] Preferably, the mass ratio of water, cement and aggregate is 1:(1.6-1.7):(3.2-3.4).

[0036] In an optional embodiment, the aggregate includes fine aggregate and coarse aggregate;

[0037] Preferably, the mass ratio of the fine aggregate to the coarse aggregate is 1:(2-2.4);

[0038] Preferably, the particle size of the fine aggregate is 2-5 mm;

[0039] Preferably, the particle size of the coarse aggregate is 5-16 mm.

[0040] In an optional embodiment, the groove depth of the U-shaped groove satisfies: the groove depth of the U-shaped groove>100mm, and bricks are used for paving;

[0041] Preferably, the bricks comprise bricks of ≥ MU10.

[0042] The technical solution of the present invention has the following advantages:

[0043] 1. The construction method for reinforcing and repairing a brick wall provided by the present invention comprises the following steps: (1) making grooves in the area to be repaired of the brick wall; (2) filling the grooves with repair materials; the repair materials include cement mortar, fine stone concrete or bricks; the cement mortar includes epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester; (3) using a water repellent to treat the brick wall after filling with water; the water repellent includes silicone, polymer and additive, and the mass ratio of silicone, polymer and additive is (13.4-17.8): (34.4-52.4): (11-32.5). The use of grooves and filling treatment on the brick wall can quickly repair wall cracks or weathering, with high repair efficiency. The cement mortar used for the filling material has excellent adhesion and compressive strength, which can improve the stability of the brick wall after repair.

[0044] The brick wall after filling with materials is treated with a water-repellent agent, and the contact angle of the treated brick wall surface is large and the hydrophobic performance is good; the water permeability and water absorption rate are both reduced, and the waterproof performance is improved; the stability of the wall structure after repair is improved; at the same time, the water-repellent agent prepared by the present invention has good adhesion, is easy to use, is water-free and transparent, and retains the historical beauty of the brick wall. The construction method of the present invention is used to reinforce the repaired brick wall, which has a wide range of applications, high strength, and good durability. While solving the wall cracks and weathering, it also retains the historical beauty and improves the wall stability.

[0045] 2. The construction method for brick wall reinforcement and repair provided by the present invention has specific repair schemes for different characteristics of the repaired areas, which is more targeted and has better repair effects. It can solve the problems of wall cracks and weathering while retaining the original structural style. When repairing, the present invention selects different repair materials to ensure better compatibility with the original brick wall and avoid new cracks caused by differences in thermal expansion coefficients.

[0046] 3. The construction method for reinforcing and repairing a brick wall provided by the present invention, the fine stone concrete comprises fine aggregate and coarse aggregate, the fine aggregate can fill the voids in the concrete, improve the compactness of the concrete, reduce the voids caused by temperature changes, and reduce the thermal expansion coefficient; the coarse aggregate will cause greater expansion when the temperature changes, thereby increasing the overall thermal expansion coefficient of the concrete. The present invention balances the strength and thermal expansion coefficient of the fine stone concrete by controlling the mass ratio of water, cement and aggregate to be 1:(1.6-1.7):(3.2-3.4), and the mass ratio of fine aggregate to coarse aggregate in the aggregate to be 1:(2-2.4), so that the fine stone concrete (8×10 -6 / ℃-9×10 -6 / ℃) and the thermal expansion coefficient of the brick wall (10×10 -6 / ℃-12×10 -6 / ℃) is close, which improves compatibility, prevents the generation of new cracks, and ensures that the strength of fine stone concrete reaches above C20;

[0047] The mass ratio of epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester in cement mortar is 1: (1.4-1.5): (3-3.5): (0.1-0.12): (0.1-0.13). The prepared cement mortar is close to the thermal expansion coefficient of the brick wall, and the strength is guaranteed to reach above M10, and the toughness and durability are good. The added ethylenediamine and dibutyl ester can make the epoxy resin, cement and fine sand fully integrated, further enhance the strength, toughness and durability of the cement mortar, and also make up for the cement expansion loss due to the addition of epoxy resin. The present invention provides a variety of treatment schemes according to different conditions of brick walls, and has a wide range of applications.

[0048] The thermal expansion coefficient of the cement mortar prepared by the present invention is about 8×10 -6 / ℃-9×10 -6 / ℃, and the thermal expansion coefficient of the brick wall (5×10 -6 / ℃-8×10 -6 / ℃) is closer to the thermal expansion coefficient of conventional cement mortar (10×10 -6 / ℃-12×10 -6 / ℃), the cement mortar prepared by the present invention has higher compatibility with brick walls, avoids new cracks caused by excessive difference in thermal expansion coefficient, and has good repair effect. The repaired brick wall will not crack again within 5 years. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0050] Figure 1 The present invention is a flowchart of a construction method for reinforcing and repairing a brick wall. DETAILED DESCRIPTION

[0051] The following examples are provided for a better understanding of the present invention, but are not intended to limit the best mode of implementation, nor to limit the content and protection scope of the present invention. Any product identical or similar to the present invention obtained by anyone under the inspiration of the present invention or by combining the features of the present invention with other prior arts shall fall within the protection scope of the present invention.

[0052] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0053] The adhesion is obtained by a pull-out method or a shear test. The adhesion of the present invention is obtained by a pull-out method test; the pull-out method: a standard test nail is adhered to the coating surface using a dedicated pull-out test machine, and then a vertical pull is applied until the coating is separated from the substrate; the adhesion value can be obtained by measuring the required pull.

[0054] The leveling property of the present invention is determined by observing the surface of the coating after coating to check whether sagging, bubbles or uneven coating occurs.

[0055] The surface drying time of the present invention is obtained by the finger touch method, which is to touch the coating surface with a finger to determine whether it is sticky. If the coating surface is not sticky, it is surface drying; the time from coating to surface drying is recorded by a timer.

[0056] The actual drying time is obtained by observation or physical property testing. The actual drying time of the present invention is obtained by observation; observation method: after coating, the appearance of the coating is continuously observed and the coating is waited for to be completely dry; under laboratory conditions, the complete drying time of the coating is evaluated under standard temperature and humidity conditions.

[0057] The surface contact angle is obtained by a water dripping method or direct measurement. The surface contact angle of the present invention is obtained by direct measurement; a contact angle measuring instrument is used for direct measurement.

[0058] The water permeability of the present invention is obtained by using a water immersion method. The water immersion method is as follows: a water tank is placed under the sample, a certain water pressure is applied, and the volume or mass of water flowing through per unit time is measured.

[0059] The water absorption rate is obtained by immersion method or surface water drop adsorption method. The water absorption rate of the present invention is obtained by immersion method; immersion method: immerse the sample in water for 24 hours, take out the sample, wipe off the surface water and weigh it. The water absorption rate calculation formula is as follows:

[0060] Water absorption rate = (wet weight - dry weight) / dry weight × 100%;

[0061] The thermal expansion coefficient is obtained by thermomechanical (TMA) method, laser interferometry method, X-ray diffraction method, comparison method or thermal expansion instrument method. The thermal expansion coefficient of the present invention is obtained by thermomechanical (TMA) method; test steps: prepare a long strip sample, place the sample in a TMA (thermomechanical) device, set the temperature range and heating rate; record the length change of the sample during the temperature change process. The thermal expansion coefficient is obtained by calculating the ratio of temperature change to size change.

[0062] Example 1

[0063] This embodiment provides a construction method for reinforcing and repairing a brick wall. Figure 1 As shown, the following steps are included:

[0064] (1) Clean the dust, oil and other impurities on the surface of the brick wall, and repair the irregular parts and obvious damage on the surface of the brick wall; the crack of the brick wall is 3mm, and a U-shaped groove is opened along the crack. The depth of the U-shaped groove is 40mm, and the width of the U-shaped groove is 30mm; the thermal expansion coefficient of the brick wall is 7×10 -6 / ℃; the surface contact angle is 50°, the water permeability is 15cm / s, and the water absorption rate is 22%.

[0065] (2) Epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester were mixed in a mass ratio of 1:1.5:3:0.12:0.13 to prepare cement mortar, and the cracks were filled with cement mortar; the thermal expansion coefficient of cement mortar was 8.2×10 -6 / ℃.

[0066] (3) Use a water repellent to perform water repellent treatment; the water repellent includes the following components by mass fraction: 18% paraffin, 28% polyvinyl alcohol, 3.2% polyvinyl ester, 14.5% methyl silicone oil, 2% potassium aluminum sulfate, 11% styrene acrylic emulsion, 3% tetraethyl silicate, 2% stearic acid, 1.5% epoxy resin, 1.8% active polysiloxane, 3% octylphenol polyoxyethylene ether, 10% carboxymethyl cellulose, and 2% isopropyl alcohol. After coating, the surface is smooth and flawless, indicating good leveling properties, the surface drying time is about 55 minutes, the actual drying time is about 24 hours, and the adhesion of the water repellent on the brick wall is 2.5-2.55MPa;

[0067] (4) Check the repaired brick wall, repair and paint. The contact angle of the repaired brick wall surface is 110°, the water permeability is 7.5 cm / s, and the water absorption is 17%. This shows that the waterproof performance of the brick wall treated with the water repellent is improved and the stability is increased. The wall after the construction of this embodiment can retain the original structure and style; the repaired brick wall will not crack again within 5 years.

[0068] Example 2

[0069] This embodiment provides a construction method for reinforcing and repairing a brick wall, comprising the following steps:

[0070] (1) Clean the dust, oil and other impurities on the surface of the brick wall, and repair the irregular parts and obvious damage on the surface of the brick wall; the crack of the brick wall is 3mm, and a U-shaped groove is opened along the crack. The depth of the U-shaped groove is 90mm and the width of the U-shaped groove is 60mm; the thermal expansion coefficient of the brick wall is 6×10 -6 / ℃; the surface contact angle is 45°, the water permeability is 15cm / s, and the water absorption rate is 25%.

[0071] (2) Forming the formwork, and then filling it with fine aggregate concrete; the fine aggregate concrete is composed of water, cement and aggregate in a mass ratio of 1:1.6:3.2, the mass ratio of fine aggregate to coarse aggregate in the aggregate is 1:2.1, the particle size of the fine aggregate is 2-5 mm; the particle size of the coarse aggregate is 5-16 mm; the thermal expansion coefficient of the fine aggregate concrete is 8×10 -6 / ℃.

[0072] (3) Use a water repellent to perform water repellent treatment; the water repellent includes the following components by mass fraction: 18% paraffin, 28% polyvinyl alcohol, 3.2% polyvinyl ester, 15% methyl silicone oil, 2.5% potassium aluminum sulfate, 11% styrene acrylic emulsion, 3% tetraethyl silicate, 5% stearic acid, 1.8% epoxy resin, 2.5% octylphenol polyoxyethylene ether, and 10% carboxymethyl cellulose. After coating, the surface is smooth and flawless, indicating good leveling properties, the surface drying time is about 1 hour, the actual drying time is about 28 hours, and the adhesion of the water repellent on the brick wall is 2.5-2.53MPa;

[0073] (4) Check the repaired brick wall, repair and paint. The contact angle of the repaired brick wall surface is 105°, the water permeability is 8 cm / s, and the water absorption is 18%. This shows that the waterproof performance of the brick wall treated with the water repellent is improved and the stability is increased. The wall after the construction of this embodiment can retain the original structure and style; the repaired brick wall will not crack again within 5 years.

[0074] Example 3

[0075] This embodiment provides a construction method for reinforcing and repairing a brick wall, comprising the following steps:

[0076] (1) Clean the dust, oil and other impurities on the surface of the brick wall, and repair the irregular parts and obvious damage on the surface of the brick wall; the crack of the brick wall is 9mm, drill holes along the crack, make pins, the diameter of the pins is 25mm, the spacing between adjacent pins in the longitudinal direction is 250mm, and the depth of the pins is 20mm less than the thickness of the brick wall. Open a U-shaped groove along the crack, the depth of the U-shaped groove is 50mm, and the width of the U-shaped groove is 40mm. The thermal expansion coefficient of the brick wall is 6.5×10 -6 / ℃; the surface contact angle is 45°, the water permeability is 16cm / s, and the water absorption rate is 22%.

[0077] (2) Epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester were mixed in a mass ratio of 1:1.4:3.3:0.11:0.12 to prepare cement mortar, and the cracks and pins were filled with cement mortar. The thermal expansion coefficient of cement mortar is 8.6×10^-6 / ℃.

[0078] (3) Use a water repellent to perform water repellent treatment; the water repellent includes the following components by mass fraction: 16% paraffin, 30% polyvinyl alcohol, 3.3% polyvinyl ester, 15% methyl silicone oil, 2% potassium aluminum sulfate, 9.5% styrene acrylic emulsion, 3.2% tetraethyl silicate, 5% stearic acid, 3.5% epoxy resin, 1.5% active polysiloxane, 9% carboxymethyl cellulose, and 2% isopropyl alcohol. After coating, the surface is smooth and flawless, indicating good leveling properties, the surface drying time is about 50 minutes, the actual drying time is about 25 hours, and the adhesion of the water repellent on the brick wall is 2.58-2.60MPa;

[0079] (4) Check the repaired brick wall, repair and paint. The contact angle of the repaired brick wall surface is 108°, the water permeability is 8.2 cm / s, and the water absorption is 17%. This shows that the waterproof performance of the brick wall treated with the water repellent is improved and the stability is increased. The wall after the construction of this embodiment can retain the original structure and style; the repaired brick wall will not crack again within 5 years.

[0080] Example 4

[0081] This embodiment provides a construction method for reinforcing and repairing a brick wall, comprising the following steps:

[0082] (1) Clean the dust, oil and other impurities on the surface of the brick wall, and repair the irregular parts and obvious damage on the surface of the brick wall; the weathering thickness is 100mm, and the bricks with ≥MU10 are used for repair; the thermal expansion coefficient of the brick wall is 6.5×10 -6 / ℃; the surface contact angle is 48°, the water permeability is 15cm / s, and the water absorption rate is 23%.

[0083] (2) Use a water repellent to perform water repellent treatment; the water repellent includes the following components by mass fraction: 15% paraffin, 26% polyvinyl alcohol, 3.2% polyvinyl ester, 16% methyl silicone oil, 11% styrene acrylic emulsion, 3.2% tetraethyl silicate, 5% stearic acid, 3.5% epoxy resin, 1% active polysiloxane, 3.2% octylphenol polyoxyethylene ether, and 12.9% carboxymethyl cellulose. After coating, the surface is smooth and flawless, indicating good leveling properties, the surface drying time is about 45 minutes, the actual drying time is about 28 hours, and the adhesion of the water repellent on the brick wall is 2.55-2.58MPa;

[0084] (3) Check the repaired brick wall, repair and paint. The contact angle of the repaired brick wall surface is 105°, the water permeability is 8 cm / s, and the water absorption is 18%. This shows that the waterproof performance of the brick wall treated with the water repellent is improved and the stability is increased. The wall after the construction of this embodiment can retain the original structure and style; the repaired brick wall will not crack again within 5 years.

[0085] Comparative Example 1

[0086] This comparative example provides a construction method for strengthening and repairing a brick wall. Compared with Example 1, the only difference is that, in step (2), a commercially available water-repellent agent (fluorosilane water-repellent agent) is used instead of the water-repellent agent in Example 1.

[0087] After coating, the surface is basically smooth and the coating is basically uniform. The surface drying time is about 30 minutes, the actual drying time is about 48 hours, and the adhesion of the water repellent on the brick wall is 2.0-2.1MPa. The surface drying time of commercially available water repellent is too short, resulting in a long actual drying time and poor adhesion.

[0088] The contact angle of the repaired brick wall surface is 100°, the water permeability is 9.5 cm / s, and the water absorption is 20%, indicating that the waterproof performance of the brick wall treated with the commercially available water-repellent agent is not as good as that of the present invention.

[0089] Comparative Example 2

[0090] This comparative example provides a construction method for strengthening and repairing a brick wall, comprising the following steps:

[0091] (1) Clean the dust, oil and other impurities on the surface of the brick wall, and repair the irregular parts and obvious damage on the surface of the brick wall; tie vertical steel bars C12@150 and horizontal steel bars C8@200 on both sides of the brick wall.

[0092] (2) After supporting the formwork on both sides of the brick wall, pour 60mm thick C40 non-shrinkage self-leveling grouting material.

[0093] Although the stability of the brick wall after reinforcement and repair in this comparison has been improved, the brick wall is covered with mortar and its original structural features cannot be displayed.

[0094] Comparative Example 3

[0095] This comparative example provides a construction method for strengthening and repairing a brick wall, comprising the following steps:

[0096] (1) Clean the dust, oil and other impurities on the surface of the brick wall, repair the irregular parts and obvious damage on the surface of the brick wall; open a U-shaped groove along the crack, the depth of the U-shaped groove is 50mm, and the width of the U-shaped groove is 40mm. The thermal expansion coefficient of the brick wall is 6.5×10 -6 / ℃.

[0097] (2) Cement and fine sand are mixed in a mass ratio of 1:2.5 to prepare cement mortar, and the cracks are filled with cement mortar. The thermal expansion coefficient of cement mortar is 11.5×10^-6 / ℃.

[0098] The thermal expansion coefficients of the material filled at the cracks and the brick wall are quite different, and the repaired brick wall showed secondary cracking after 6 months, indicating that the cement mortar of the present invention including epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester is helpful to improve the stability of the repaired brick wall.

[0099] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A construction method for strengthening and repairing a brick wall, characterized in that: The steps include: (1) Perform grooving in the area to be repaired on the brick wall; (2) filling the groove with a repair material; the repair material includes cement mortar, fine stone concrete or brick; the cement mortar includes epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester; (3) A water-repellent agent is used to perform water-repellent treatment on the filled brick wall; the water-repellent agent comprises silicone, polymer and additive, and the mass ratio of silicone, polymer and additive is (13.4-17.8):(34.4-52.4):(11-32.5).

2. The construction method according to claim 1, characterized in that: The organic silicon comprises at least one of methyl silicone oil and active polysiloxane; and / or, The polymer comprises at least one of polyvinyl alcohol, polyvinyl ester, styrene acrylic emulsion and epoxy resin; and / or, The additive comprises at least one of potassium aluminum sulfate, stearic acid, octylphenol polyoxyethylene ether, hydroxymethyl cellulose, tetraethyl silicate and isopropyl alcohol.

3. The construction method according to claim 1, characterized in that: The water repellent further comprises a solvent; Preferably, the mass ratio of the solvent to the silicone is (12-18):(13.4-17.8); Preferably, the solvent comprises paraffin.

4. The construction method according to claim 1, characterized in that: In the step (1), the crack in the area to be repaired is ≤3 mm, a U-shaped groove is opened along the crack, the groove depth of the U-shaped groove is ≥15 mm, and the groove width of the U-shaped groove is ≥20 mm.

5. The construction method according to claim 1, characterized in that: In the step (1), if the crack of the area to be repaired is 3 mm < ≤ 10 mm, a hole is drilled along the crack, a pin is made, and a U-shaped groove is opened along the crack, wherein the groove depth of the U-shaped groove is ≥ 15 mm, and the groove width of the U-shaped groove is ≥ 20 mm; Preferably, the parameters of the pin key specifically include: the diameter of the pin key is 25-50 mm, the distance between the pin keys is 250-300 mm, and the depth of the pin key is 20-25 mm less than the thickness of the area to be repaired.

6. The construction method according to claim 1, characterized in that: In the step (1), the weathering thickness or damaged diameter of the area to be repaired is ≥100 mm, and bricks are used for repair; Preferably, the bricks include bricks with a strength level of ≥ MU10, wherein MU is a strength grade code of the brick.

7. The construction method according to claim 4 or 5, characterized in that: The depth of the U-shaped groove is ≤50 mm, and the crack is filled with cement mortar; Preferably, the mass ratio of the epoxy resin, cement, fine sand, ethylenediamine and dibutyl ester is 1:(1.4-1.5):(3-3.5):(0.1-0.12):(0.1-0.13).

8. The construction method according to claim 4 or 5, characterized in that: The depth of the U-shaped groove meets the following conditions: 50mm<the depth of the U-shaped groove≤100mm, the formwork is supported, and then the fine stone concrete is poured; Preferably, the fine stone concrete comprises water, cement and aggregate; Preferably, the mass ratio of water, cement and aggregate is 1:(1.6-1.7):(3.2-3.4).

9. The construction method according to claim 8, characterized in that: The aggregate includes fine aggregate and coarse aggregate; Preferably, the mass ratio of the fine aggregate to the coarse aggregate is 1:(2-2.4); Preferably, the particle size of the fine aggregate is 2-5 mm; Preferably, the particle size of the coarse aggregate is 5-16 mm.

10. The construction method according to claim 4 or 5, characterized in that: The groove depth of the U-shaped groove meets the requirement that the groove depth of the U-shaped groove is greater than 100 mm and bricks are used for paving; Preferably, the bricks comprise bricks of ≥ MU10.

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