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...

AI Technical Summary

Problems solved by technology

2. Errors in design or construction cause engineering quality accidents but have not reached the level of demolition and reconstruction, and the building structure must be reinforced and maintained in a timely manner

Practice has shown that when the grouting material for reinforcement is improperly selected or used, and the construction method is unreasonable, the grouting material is likely to crack, which will affect the quality of the project

For example, when high-strength grouting material is used to strengthen the brick wall, due to the strong water absorption of sintered bricks, it is easy to cause the grouting material to lose water too quickly, resulting in shrinkage cracks; when the wall is poured with a large area, it is also easy to produce shrinkage cracks

Due to the high requirements on the early strength of the grouting material, the grouting material will generate a large heat of hydration in the early stage. If it is not properly controlled, a large temperature stress will be generated inside and outside the wall or structural column, resulting in the occurrence of through cracks and damage to the building. Structural safety poses great hidden dangers