Method for grouting and strengthening thin-walled structures in buildings to control cracking

Abstract

The invention relates to a method for grouting and strengthening thin-walled structures in buildings to control cracking, and is mainly divided into four parts: formwork construction, crack-resistant grouting material preparation, grouting material pouring and quality control. Compared with the existing technology, in the case of vibration-free construction, the cracking of the reinforcement material is avoided to ensure the safety of the structure. After adding active admixtures, fibers, aggregates and other components to the grouting material, the material is crack-resistant The durability is greatly improved, and the cost of materials can be significantly reduced. The use of permeable template cloth for maintenance construction can significantly reduce the risk of cracking caused by drying shrinkage of grouting materials, and can also significantly improve the appearance quality of reinforced components.

Description

technical field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a method for grouting and reinforcing thin-walled structures in existing buildings and controlling cracking. Background technique

[0002] Our country is entering a peak period of reinforcement and transformation of existing buildings. A large number of industrial plants, public buildings and civil buildings built in the 1950s and 1960s in my country have entered the middle-aged and old age with billions of square meters, and their appraisal, maintenance and reinforcement have been put on the agenda in large numbers. It involves the following aspects: 1. To change the function and use of old houses, the old buildings must be reinforced, such as increasing the height, increasing the load, increasing the span, increasing the number of floors, etc. 2. Errors in design or construction cause engineering quality accidents but have not reached the level of dem...

Examples

Embodiment 1

[0044] A method for grouting reinforcement of thin-walled structures in existing buildings and controlling cracking. It is mainly divided into four parts: formwork construction, preparation of crack-resistant grouting materials, pouring of grouting materials, and quality control. Next, each part will be expanded. illustrate.

[0045] 1. Formwork construction

[0046] 1. Construction of permeable template cloth

[0047]Due to the large amount of cement used in the grouting material, the water-cement ratio is small, the early strength is high, the ultimate strain is small, and the crack resistance is poor. If the maintenance is not proper, it is very easy to cause stress due to surface water loss or temperature difference, resulting in cracking of the grouting material, and such cracks are likely to be penetrating, which has a great impact on the structure. Based on this consideration, for the first time in the grouting reinforcement construction of thin-walled structures, per...

Embodiment 2

[0094] A method for grouting and reinforcing existing buildings, the process of which is roughly the same as in Example 1, the difference being that the anti-cracking grouting material is prepared from the following components and raw materials in parts by weight: grouting material 100, active Admixture 20, retarder 0.02, fiber 0.05, powder filler 20, aggregate 50. The performance of the grouting material should meet the requirements of GB / T50448-2008 "Technical Specifications for the Application of Cement-based Grouting Materials". The active admixture is slag powder, the retarder is citric acid, the fiber is polypropylene fiber, and the particle size of the aggregate is not greater than 10mm. Continuous particle size fine stone, powder filler is quartz powder.

Embodiment 3

[0096] A method for grouting and reinforcing existing buildings, the process of which is roughly the same as in Example 1, the difference being that the anti-cracking grouting material is prepared from the following components and raw materials in parts by weight: grouting material 100, active Admixture 50, retarder 0.2, fiber 0.2, powder filler 50, aggregate 100, the performance of the grouting material should meet the requirements of GB / T50448-2008 "Technical Specifications for the Application of Cement-based Grouting Materials", and the active admixture is slag powder and Steel slag powder; the retarder is gluconic acid, the fiber is polypropylene fiber, the aggregate is continuous particle size fine stone with a particle size not greater than 10mm, and the powder filler is talcum powder.

technical field

[0001] The invention belongs to the technical field of building construction, and in particular relates to a method for grouting and reinforcing thin-walled structures in existing buildings and controlling cracking. Background technique

[0002] Our country is entering a peak period of reinforcement and transformation of existing buildings. A large number of industrial plants, public buildings and civil buildings built in the 1950s and 1960s in my country have entered the middle-aged and old age with billions of square meters, and their appraisal, maintenance and reinforcement have been put on the agenda in large numbers. It involves the following aspects: 1. To change the function and use of old houses, the old buildings must be reinforced, such as increasing the height, increasing the load, increasing the span, increasing the number of floors, etc. 2. Errors in design or construction cause engineering quality accidents but have not reached the level of dem...

Examples

Embodiment 1

[0044] A method for grouting reinforcement of thin-walled structures in existing buildings and controlling cracking. It is mainly divided into four parts: formwork construction, preparation of crack-resistant grouting materials, pouring of grouting materials, and quality control. Next, each part will be expanded. illustrate.

[0045] 1. Formwork construction

[0046] 1. Construction of permeable template cloth

[0047]Due to the large amount of cement used in the grouting material, the water-cement ratio is small, the early strength is high, the ultimate strain is small, and the crack resistance is poor. If the maintenance is not proper, it is very easy to cause stress due to surface water loss or temperature difference, resulting in cracking of the grouting material, and such cracks are likely to be penetrating, which has a great impact on the structure. Based on this consideration, for the first time in the grouting reinforcement construction of thin-walled structures, per...

Embodiment 2

[0094] A method for grouting and reinforcing existing buildings, the process of which is roughly the same as in Example 1, the difference being that the anti-cracking grouting material is prepared from the following components and raw materials in parts by weight: grouting material 100, active Admixture 20, retarder 0.02, fiber 0.05, powder filler 20, aggregate 50. The performance of the grouting material should meet the requirements of GB / T50448-2008 "Technical Specifications for the Application of Cement-based Grouting Materials". The active admixture is slag powder, the retarder is citric acid, the fiber is polypropylene fiber, and the particle size of the aggregate is not greater than 10mm. Continuous particle size fine stone, powder filler is quartz powder.

Embodiment 3

[0096] A method for grouting and reinforcing existing buildings, the process of which is roughly the same as in Example 1, the difference being that the anti-cracking grouting material is prepared from the following components and raw materials in parts by weight: grouting material 100, active Admixture 50, retarder 0.2, fiber 0.2, powder filler 50, aggregate 100, the performance of the grouting material should meet the requirements of GB / T50448-2008 "Technical Specifications for the Application of Cement-based Grouting Materials", and the active admixture is slag powder and Steel slag powder; the retarder is gluconic acid, the fiber is polypropylene fiber, the aggregate is continuous particle size fine stone with a particle size not greater than 10mm, and the powder filler is talcum powder.