Building masonry reinforcement construction method based on gridding cloth

Abstract

The invention relates to the field of masonry structure reinforcement, and provides a building masonry reinforcement construction method based on gridding cloth in order to solve the problems that an existing reinforcement method is high in cost, poor in anti-seismic performance and bearing capacity and the like, and the building masonry reinforcement construction method comprises the following steps that a construction platform is built, and surface leveling, rust prevention or scabbling treatment is conducted on an area to be reinforced; preparing polymer mortar, and uniformly stirring and mixing; flatly smearing a first layer of polymer mortar on the surface of the treated to-be-reinforced area; a carbon fiber grid matched with the surface of the to-be-reinforced area is sheared and laid on the first layer of polymer mortar, and then the carbon fiber grid is temporarily fixed; after a certain period of time, the surface of the carbon fiber grid is brushed and pressed through a pressing device, and the bonding strength between the carbon fiber grid and the polymer mortar is guaranteed; flatly smearing a second layer of polymer mortar on the carbon fiber grid; and after standing for a certain time, carrying out surface maintenance treatment on the to-be-reinforced area so as to finish building masonry reinforcement construction.

Description

Technical Field

[0001] This invention relates to the field of masonry structure reinforcement, and more specifically to a construction method for reinforcing masonry structures based on mesh fabric. Background Technology

[0002] Masonry structures are structures whose main load-bearing components (walls and columns) are made of blocks and mortar. They are widely used in building structures because of their readily available materials and low cost. However, masonry structures are susceptible to structural damage from natural disasters, environmental erosion, and lack of maintenance over the years. This damage can significantly weaken the strength, stiffness, and stability of the masonry structure. In particular, unreinforced masonry structures have poor integrity and seismic resistance and are prone to cracking under external loads. The repair and reinforcement of masonry structures need to be addressed promptly and effectively, otherwise, it can lead to significant economic losses and casualties.

[0003] Currently, common methods for strengthening and repairing masonry structures include: reinforced concrete surface layer reinforcement, reinforced mesh cement mortar surface layer reinforcement, fiber cloth bonding reinforcement, and wire rope mesh modified polymer mortar reinforcement. However, these methods are prone to steel reinforcement corrosion, resulting in unsatisfactory reinforcement effects, complex procedures, and high costs. Fiber cloth bonding reinforcement, in humid environments, is susceptible to fiber cloth detachment and bulging, leading to reinforcement failure. Therefore, it is essential to find an effective and reliable technology for the renovation and reinforcement of existing masonry structures. Summary of the Invention

[0004] The purpose of this invention is to solve the technical problems of high cost, poor seismic performance, bearing capacity and durability of existing masonry reinforcement methods, and to propose a masonry reinforcement construction method based on mesh fabric.

[0005] To achieve the above objectives, the technical solution proposed by this invention is as follows:

[0006] The building masonry reinforcement construction method based on mesh fabric is characterized by the following steps:

[0007] S1. Set up a construction platform and perform surface leveling, rust prevention, or roughening treatment on the area to be reinforced.

[0008] S2. Prepare polymer mortar and mix it evenly;

[0009] S3. Apply the first layer of polymer mortar to the surface of the area to be reinforced after step S1.

[0010] S4, cut the carbon fiber grid which is adapted to the surface of the area to be reinforced, and lay it on the first layer of polymer mortar, and then temporarily fix the carbon fiber grid;

[0011] S5, after waiting for a certain period of time, brush and press the surface of the carbon fiber grid by the pressing device to ensure the bonding strength between the carbon fiber grid and the polymer mortar;

[0012] S6, evenly apply the second layer of polymer mortar on the carbon fiber grid;

[0013] S7, after waiting for a certain period of time, perform surface curing treatment on the area to be reinforced, thereby completing the construction of building masonry reinforcement.

[0014] Further, in step S2, the polymer mortar comprises powder, polymer emulsion, water reducing agent and water;

[0015] In step S3, the thickness of the first layer of polymer mortar is 0.4-0.6 cm;

[0016] In step S6, the thickness of the second layer of polymer mortar is 1.0-2.0 cm.

[0017] Further, in step S1, a primer is also applied to the treated area to be reinforced to enhance the adhesion of the area to be reinforced.

[0018] Further, in step S3, it further comprises:

[0019] After the first layer of polymer mortar is applied, the thickness of the mortar is sampled and checked, and the sampling points are not less than 3;

[0020] If the thickness of the mortar layer applied at each sampling point meets (0.4-0.6) ± 0.05 cm, it indicates that the application is qualified;

[0021] Otherwise, it needs to be reapplied until it meets the application requirements.

[0022] Further, in step S4, when the carbon fiber grid is laid, the direction of the carbon fiber filaments of the carbon fiber grid is perpendicular to the direction of the cracks of the area to be reinforced.

[0023] Further, in step S5, the waiting time is 3-5 h.

[0024] Further, in step S6, it further comprises:

[0025] After the second layer of polymer mortar is applied, the thickness of the mortar is sampled and checked, and the sampling points are not less than 3;

[0026] If the mortar layer thickness of each sampling point meets (1.0-2.0) ±0.05 cm, it indicates that the coating is qualified;

[0027] Otherwise, it needs to be re-coated until it meets the coating requirements.

[0028] Further, in step 2, the mass ratio of each substance in the polymer mortar is:

[0029] Powder: polymer emulsion: water reducing agent: water = 900-1100: 65-75: 0.65-0.75: 185-220;

[0030] Among them: the water reducing agent is PCA-I polycarboxylic acid high-performance water reducing agent;

[0031] The polymer particles in the polymer emulsion are 15pm ± 2pm.

[0032] Further, the powder includes Portland cement, quartz sand and microfiller;

[0033] The mass ratio of each substance in the powder is:

[0034] Portland cement: quartz sand: microfiller = 50-60: 95-115: 12-15.

[0035] Further, the maximum particle size of the quartz sand is 2mm;

[0036] The microfiller is superfine fly ash and superfine microsilica powder;

[0037] The water-reducing rate of the water reducing agent is 25% ± 3%.

[0038] The beneficial effects of the present application are:

[0039] 【1】The operation process of the building masonry reinforcement construction method based on the grid cloth is simple and easy to realize, the area to be reinforced is reinforced by carbon fiber grid combined with polymer mortar, which can effectively improve the overall stress capacity of the masonry structure, the polymer mortar penetrates into the carbon fiber grid, which can make the masonry structure bear multiple direction external loads, effectively enhance the seismic performance, bearing capacity and durability of the masonry structure, and the method is suitable for masonry reinforcement in different scenes, the implementation process is simple, the cost is low, and the safety and reliability of the masonry building structure are effectively improved, and the service life of the building structure is prolonged.

[0040] 【2】The application adds powder into polymer emulsion, and the polymer emulsion and the powder hydrate product can form a dense net structure, effectively improving the mechanical properties, bending strength and compressive strength of the polymer mortar; the silicate cement in the polymer is embedded into the gap between the carbon fiber of the carbon fiber mesh, so that the carbon fiber mesh and the polymer mortar form a shear-resistant embedding effect, ensuring that the carbon fiber mesh and the polymer mortar have sufficient gripping force and anchoring force, thereby structurally reinforcing the masonry structure and effectively improving the mechanical properties and overall stress performance of the masonry structure. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 FIG. 1 is a structural diagram of a carbon fiber mesh in the building masonry reinforcement construction method based on the mesh according to the application. DETAILED DESCRIPTION

[0042] The building masonry reinforcement construction method based on the mesh comprises the following steps:

[0043] S1, a construction platform is built, the surface of the area to be reinforced is leveled, the loose layer on the surface of the area to be reinforced is removed, the floating dust is cleaned, the rusted steel bars in the area to be reinforced are derusted, cleaned and then treated against rust, and the concrete base surface is chiseled by manual chiseling;

[0044] An oxygen-based interface agent is applied to the treated area to be reinforced to enhance the adhesion of the area to be reinforced;

[0045] S2, polymer mortar is prepared, and a low-speed drill bit is used to stir the polymer mortar for 3-5 minutes to fully mix and uniformly distribute the polymer mortar;

[0046] The polymer mortar comprises powder, polymer emulsion, water reducing agent and water; the powder comprises silicate cement, quartz sand and microfiller; the water reducing agent is PCA-I polycarboxylic acid high-performance water reducing agent; the polymer particles in the polymer emulsion are 15 μm.

[0047] When the materials are prepared, the mass ratio of the substances in the polymer mortar is:

[0048] Powder: polymer emulsion: water reducing agent: water = 1000: 70: 0.7: 200; the polymer emulsion and water are mixed first, and then the corresponding mass of powder is added to the liquid material and stirred uniformly.

[0049] When the materials are prepared, the mass ratio of the substances in the powder is: silicate cement: quartz sand: microfiller = 55: 110: 14;

[0050] The maximum particle size of the quartz sand is 2 mm, the microfiller is superfine fly ash and superfine microsilica, and the water reducing rate of the water reducing agent is 25% ± 3%.

[0051] S3. Apply a first layer of polymer mortar to the surface of the treated area to be reinforced, with a thickness of 0.5cm.

[0052] After the first layer of polymer mortar is applied, the thickness of the mortar coating is sampled and checked, with no fewer than 3 sampling points.

[0053] If the thickness of the mortar layer applied at each sampling point meets the requirement of 0.5±0.05cm, it indicates that the application is qualified; otherwise, it needs to be reapplied until it meets the application requirements.

[0054] S4, such as Figure 1 As shown, a carbon fiber mesh adapted to the surface of the area to be reinforced is cut and laid on the first layer of polymer mortar. When laying the carbon fiber mesh, the direction of the carbon fiber filaments of the carbon fiber mesh is perpendicular to the direction of the crack in the area to be reinforced. Then, the ends of the carbon fiber mesh are temporarily fixed by anchoring to ensure that the carbon fiber mesh is laid flat on the surface of the area to be reinforced.

[0055] S5. After waiting for 3 hours, brush and press the surface of the carbon fiber mesh with a roller to ensure the bonding strength between the carbon fiber mesh and the polymer mortar.

[0056] S6. Apply a second layer of polymer mortar evenly to the carbon fiber mesh. The thickness of the second layer of polymer mortar is 1.5cm.

[0057] After the second layer of polymer mortar is applied, the thickness of the mortar coating is sampled and checked, with no fewer than three sampling points.

[0058] If the thickness of the mortar layer applied at each sampling point meets the requirement of 1.5±0.05cm, it indicates that the application is qualified; otherwise, it needs to be reapplied until it meets the application requirements.

[0059] S7. After applying the coating, let it stand for a certain period of time and then perform surface curing treatment on the area to be reinforced.

[0060] Specifically, after the coating is applied, it is left to stand on the surface of the area to be reinforced until it initially sets. Then, it is covered with a damp cloth and cured in an environment of 5℃-40℃ for at least 7 days to complete the masonry reinforcement construction of the building.

Claims

1. A construction method for reinforcing masonry structures based on mesh fabric, characterized in that, Includes the following steps: S1. Set up a construction platform and perform surface leveling, rust prevention, or roughening treatment on the area to be reinforced. S2. Prepare polymer mortar and mix it evenly; S3. Apply the first layer of polymer mortar to the surface of the area to be reinforced after step S1. S4. Cut a carbon fiber mesh that is compatible with the surface of the area to be reinforced, lay it on the first layer of polymer mortar, and then temporarily fix the carbon fiber mesh. S5. After waiting for a certain period of time, brush and press the surface of the carbon fiber mesh using a pressing device to ensure the bonding strength between the carbon fiber mesh and the polymer mortar. S6. Apply a second layer of polymer mortar evenly onto the carbon fiber mesh; S7. After standing for a certain period of time, perform surface curing treatment on the area to be reinforced to complete the masonry reinforcement construction of the building.

2. The construction method for reinforcing masonry structures based on mesh fabric according to claim 1, characterized in that: In step S2, the polymer mortar includes powder, polymer emulsion, water-reducing agent and water; In step S3, the thickness of the first layer of polymer mortar is 0.4 to 0.6 cm; In step S6, the thickness of the second layer of polymer mortar is 1.0 to 2.0 cm.

3. The construction method for reinforcing masonry structures based on mesh fabric according to claim 2, characterized in that: Step S1 also includes applying a reactive oxygen interface agent to the treated area to be reinforced in order to enhance the adhesion of the area to be reinforced.

4. The construction method for reinforcing masonry structures based on mesh fabric according to claim 3, characterized in that, Step S3 also includes: After the first layer of polymer mortar is applied, the thickness of the mortar coating is sampled and checked, with no fewer than 3 sampling points. If the thickness of the mortar layer applied at each sampling point meets the requirement of (0.4~0.6)±0.05cm, it indicates that the application is qualified. Otherwise, you need to reapply until it meets the application requirements.

5. The construction method for reinforcing masonry structures based on mesh fabric according to claim 4, characterized in that: In step S4, when the carbon fiber mesh is laid, the direction of the carbon fiber filaments of the carbon fiber mesh is perpendicular to the direction of the crack in the area to be reinforced.

6. The construction method for reinforcing masonry structures based on mesh fabric according to claim 5, characterized in that: In step S5, the waiting time is 3 to 5 hours.

7. The construction method for reinforcing masonry structures based on mesh fabric according to claim 6, characterized in that, Step S6 also includes: After the second layer of polymer mortar is applied, the thickness of the mortar coating is sampled and checked, with no fewer than three sampling points. If the thickness of the mortar layer applied at each sampling point meets the requirement of (1.0~2.0)±0.05cm, it indicates that the application is qualified. Otherwise, you need to reapply until it meets the application requirements.

8. The construction method for reinforcing masonry structures based on mesh fabric according to claim 7, characterized in that, Its features are: In step 2, the mass ratio of each substance in the polymer mortar is as follows: Powder: Polymer emulsion: Water-reducing agent: Water = 900-1100: 65-75: 0.65-0.75: 185-220; Wherein: the water-reducing agent is PCA-I polycarboxylate high-performance water-reducing agent; The polymer particles in the polymer emulsion are 15μm±2μm.

9. The construction method for reinforcing masonry structures based on mesh fabric according to claim 8, characterized in that: The powder includes silicate cement, quartz sand, and microfillers; The mass ratio of each substance in the powder is as follows: Silicate cement: quartz sand: microfiller = 50-60: 95-115: 12-15.

10. The construction method for reinforcing masonry structures based on mesh fabric according to claim 9, characterized in that: The maximum particle size of the quartz sand is 2 mm; The microfiller is ultrafine fly ash and ultrafine silica powder; The water-reducing agent has a water reduction rate of 25% ± 3%.

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