As building subsidence repair is also known, construction safety and quality control is an important step to ensure the stability and extend the service life of buildings. The following is a detailed analysis from the two aspects of construction safety and quality control:

First, construction safety measures

1. Preparation before construction

Before the construction, it is necessary to conduct a comprehensive survey of the love of the local gays, including geological conditions, changes in the groundwater level and the surrounding environment, so as to formulate a reasonable construction plan. For the construction involving the sinking of a caisson, it is necessary to ensure that the construction of the waterproof layer of the well wall is completed, and check the integrity of the equipment and the embedded pipeline. In addition, it is also necessary to remove or reinforce the overhead poles and underground pipelines in the construction area.

2. Safety control during construction

- Sinking of caisson: In the sinking process of caisson, it is necessary to observe the inclination and structural deformation of the shaft at any time to ensure its stability. When using high-pressure jet assisted sinking, the jet nozzle should not be directed at people or equipment, and the surface enclosure should be set for protection.

- Drainage bottom sealing: when the water level outside the well is high, it is necessary to fill the water without drainage bottom sealing to prevent a large number of soil gushing damage.

- Perimeter protection: Observation of surrounding buildings and ground should be strengthened during construction to prevent large area collapse.

3. Emergency measures

If abnormal conditions (such as soil collapse outside the shaft wall) are found during construction, the sinking operation should be stopped immediately and control measures such as backfilling should be taken. At the same time, the construction site should be equipped with diving personnel and equipment in order to respond to emergencies.

4. Environmental protection

During the construction process, damage to the surrounding environment should be avoided, such as avoiding soil extraction by explosive method, and taking balanced subsidence measures to prevent cracking.

2. Quality control measures

1. Construction specifications and technical requirements

- Caisson sinking: During the construction process, the inclination and displacement of the shaft should be strictly controlled, and the deviation should be corrected in time. For the caisson that has been made and sunk many times, the stability of the underlying layer should be checked and measures should be taken.

- Grouting technology: ground subsidence grouting and foundation subsidence grouting are commonly used technical means, through the injection of cement slurry and other materials, to improve the bearing capacity and stability of the foundation.

2. Monitoring and recording

- Real-time monitoring: The construction management system with real-time monitoring function is used to control the posture and sinking speed of the cylinder.

- Record and acceptance: record all the data in the construction process in detail, including geological data, construction technology, quality inspection, etc., to ensure that the construction quality meets the standards.

3. Material and equipment management

- Material testing: Strict testing of cement, lime and other materials used to ensure that their quality meets the requirements.

- Equipment inspection: Check the installation of water pumps, pipelines and other equipment before construction, and ensure their normal operation.

4. Construction scheme optimization

According to the geological conditions and building characteristics, make a reasonable construction plan. For example, if the foundation of the self-built house is not strong, the pile foundation reinforcement and foundation grouting can be used.

5. Summarize and improve

After the construction is completed, the experience and lessons in the construction process should be summarized, and corrective measures should be formulated to optimize the construction process.

Three, common problems and solutions

1. Caisson inclination and deviation

It is solved by adjusting the pressure distribution in the wellbore and correcting the deviation in time.

2. Insufficient bearing capacity of foundation

The bearing capacity of the foundation is improved by means of replacement filling, piling and grouting.

3. Cracks and tilts

Minor cracks can be solved by filling and strengthening, while severe tilts require extensive modification or reconstruction.

Iv. Conclusion

As building repair is also known, construction safety and quality control should start from the aspects of pre-construction preparation, safety and quality control during construction, emergency measures, and environmental protection. Through strict compliance with construction codes, the use of advanced technology, enhanced monitoring and recording, and the optimization of construction schemes, construction safety and quality can be effectively guaranteed, thereby extending the service life of buildings and ensuring their stability.