Due to incomplete design and construction, water seepage in the foundation and other issues, the house may experience settlement. Is there a criterion to define when intervention in the settlement problem is needed? tank foundation subsidence treatment to what extent is acceptable and beyond what extent measures need to be taken? If you also have such a question, let's explore the allowable value of tank foundation subsidence treatment together in order to better understand the knowledge related to sedimentation prevention.

I. Factors influencing the allowable range of tank foundation subsidence treatment

1. Building type: Different types of buildings have different allowable settlement ranges. Generally speaking, the allowable settlement value for multi-story residential buildings is relatively large, while for high-rise buildings, due to their higher requirements for the bearing capacity and stability of the foundation, the allowable settlement value is relatively small. For example, for multi-story brick-concrete structure residences, the allowable value of the overall slope may be relatively lenient. For office buildings with high-rise frame-shear wall structures, the control of inclination and settlement is more strict.

2. foundation soil properties: The type and physical-mechanical properties of the foundation soil are among the key factors determining the allowable range of tank Foundation subsidence treatment. For instance, houses built on soft soil foundations usually have a larger settlement due to the high compressibility of soft soil, and the definition of the allowable settlement range is also different from that of houses built on hard foundation soil. For foundation soils with low compressibility such as sandy and gravel, the tank foundation subsidence treatment is relatively small, and the allowable range varies accordingly.

3. foundation form: The foundation form has a significant effect on tank Foundation subsidence treatment. Foundation forms with good integrity such as raft foundation and box foundation can distribute the upper load more evenly and reduce the uneven settlement of the foundation. The allowable range of settlement may be relatively loose. However, when the load is large, independent foundations, strip foundations, etc. are prone to local significant settlement, and the requirements for settlement control are higher.

2. tank foundation subsidence treatment General standard of permitted range

Settlement rate: In the early stage of building construction and use, the settlement rate is an important indicator to measure whether the settlement is normal. Under normal circumstances, for ordinary buildings, the settlement rate during construction should be controlled at no more than 10mm per month. High-rise buildings may be controlled to no more than 20mm per month. When a house is completed and put into use, the settlement rate should gradually decrease over time. When the sedimentation rate is less than 0.01-0.04mm/d, it can be considered that the sedimentation has basically stabilized.

2. Overall tilt: Overall tilt refers to the degree of inclination of a building in the vertical direction. For buildings with masonry load-bearing structures, the allowable overall inclination is generally 0.004 (four thousandths of the building height). For frame structures, row frame structures, etc., the allowable settlement difference between adjacent column foundations is usually 0.002L (L is the center distance between adjacent column foundations).

3. Local settlement: For local settlement of buildings, such as uneven settlement of the foundation, there are also corresponding control standards. Generally, the settlement difference between adjacent foundations should not be too large to avoid cracking or damage to the building structure. For instance, for general civil buildings, the settlement difference between adjacent foundations should not exceed 20mm.

4. Other regulations:

The settlement limit for high-rise buildings is usually 2‰ to 3‰, meaning that the settlement of each floor of the building does not exceed 2‰ to 3‰ of the height of that floor. For example, for a building with a height of 100 meters, its settlement limit is 200mm to 300mm.

② Medium and low compressibility soil: When the building height does not exceed 250m, the settlement is taken as 200mm. When the building height is no more than 100 meters, the settlement is taken as 400mm. When the building height is between 100m and 200m, the settlement is taken as 300mm. When the building height is between 200m and 250m, the settlement is taken as 200mm.

Iii. Hazards of Subsidence Exceeding the Allowable Range and Countermeasures

1. Hazard: When tank foundation subsidence treatment exceeds the permitted range, it may cause cracks in the structure of the house, affecting the appearance and functionality of the house; In severe cases, it may even endanger the structural safety of the building, such as wall cracking, deformation of beams and columns, and subsidence of floor slabs, which may lead to serious consequences such as the collapse of the building.

2. Countermeasures: Once it is found that the tank foundation subsidence treatment exceeds the permitted range, a detailed examination and assessment should be conducted promptly to analyze the cause of sedimentation. Depending on the specific circumstances, measures such as foundation reinforcement, structural reinforcement, and adjustment of the upper load can be taken to control settlement and ensure the safety and normal use of the building. For instance, for settlement caused by weak foundation soil, methods such as Tongcheng Soft Foundation non-excavation settlement repair technology and high-pressure jet grouting piles can be adopted to enhance the bearing capacity of the foundation. For structural cracks caused by uneven settlement of the foundation, methods such as carbon fiber reinforcement and steel bonding reinforcement can be adopted to repair the structure.

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