Method for controlling cracking by carrying out grouting reinforcement on thin-walled structures in building

Abstract

The invention relates to a method for controlling cracking by carrying out grouting reinforcement on thin-walled structures in a building, which is mainly divided into four parts, i.e., formwork construction, anti-cracking grouting material preparation, grouting material pouring and quality control. Compared with the prior art, under the case of vibration-free construction, the method prevents reinforcing material from cracking to ensure the safety of the structures, the anti-cracking property of the material is greatly increased after components, such as active admixture, fibers and aggregate, are added into the grouting material, moreover, the material cost can be remarkably reduced, adopting controlled permeability formwork liners to maintain construction can remarkably decrease the risk of cracking caused by the dry shrinkage of the grouting material, and furthermore, the appearance quality of reinforcing members also can be remarkably improved.

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