As building repair is also known to be one of the key technologies to improve the service life of buildings, its main purpose is to restore the stability and safety of buildings through scientific restoration methods, so as to extend their service life. The importance and key technologies of building subsidence repair are described in detail in the following aspects.

First, the harm of building subsidence

Building subsidence can lead to a variety of problems, including damage to structural stability, reduced bearing capacity, and affected use functions. These problems not only threaten the lives of residents, but also may cause irreversible damage to buildings and even collapse. For example, foundation subsidence can destabilize the superstructure of a building, increasing the risk of collapse, and at the same time weaken the carrying capacity of the building, making it unable to support the expected weight, thereby shortening its service life.

Second, the importance of building subsidence repair

1. Ensure safety: Timely repair of building subsidence can effectively avoid structural damage and safety hazards caused by unstable foundations.

2. Extend the service life: Through scientific restoration means, such as grouting reinforcement, piling, etc., can significantly improve the bearing capacity and stability of the foundation of the building, thereby extending its service life.

3. Improve living comfort: After restoration, the function and living comfort of the building will be restored, further improving the quality of life of residents.

3. Key technologies for building subsidence repair

1. Grouting reinforcement method: cement grout or other materials are injected through drilling holes to fill the gaps in the soil layer of the foundation to enhance the compactness and strength of the foundation. This method has high construction efficiency, little influence on the building structure, and long-lasting repair effect.

2. Piling method: Drive reinforced concrete piles or steel piles around the building or under the foundation to increase the bearing capacity and stability of the foundation. This method is suitable for the area of severe subsidence and can significantly improve the overall rigidity and seismic resistance of the building.

3. Lifting technology: For the foundation that has sunk, hydraulic jacks and cable systems can be used to gradually restore the house to the original level to avoid secondary damage to the house structure.

4. Grouting reinforcement method: By injecting cement, lime, mortar and other materials into the foundation to increase the compactness and strength of the foundation. This method is suitable for weak foundations or poor soil quality.

5. MNC settlement repair technology: combined with the dual action mechanism of physical filling and chemical reinforcement, the special composite slurry is used to fill the soil pores, enhance the soil compactness and improve the bearing capacity.

4. Monitoring and maintenance after repair

After the repair is completed, regular monitoring and maintenance are the key measures to ensure the long-term effectiveness of the repair effect. It is recommended to install monitoring equipment to detect and handle potential problems in a timely manner. In addition, rational land use planning and geological survey evaluation are also important means to prevent future subsidence problems.

V. Case analysis

1. Jinhua Construction sinking grouting and foundation sinking grouting technology: cement slurry is injected into the hole to fill the gap in the foundation soil layer, effectively improving the bearing capacity and stability of the foundation.

2. Ordos road subsidence grouting technology: Aiming at the problem of road subsidence, the gap is filled by grouting technology to improve the bearing capacity of the foundation.

3. Tangshan foundation subsidence repair: pile foundation reinforcement, grouting and other methods have significantly improved the bearing capacity and stability of the foundation.

Vi. Conclusion

building subsidence repair technology is a key means to improve the service life of buildings. Through scientific restoration methods and technical means, the stability and safety of the building can be effectively restored and its service life can be extended. At the same time, regular monitoring and maintenance is also an important guarantee to ensure the long-term effectiveness of the repair effect. In the future, with the continuous progress of technology, building subsidence repair technology will be more diversified and efficient, providing strong support for the sustainable development of the construction industry.