A method for rectifying and strengthening prefabricated pile foundations of high-rise buildings

Abstract

The invention discloses a correction and reinforcement method for a precast pile foundation of a high-rise building. The correction and reinforcement method for the precast pile foundation of the high-rise building comprises the steps that 1, the reason for settlement and inclination is analyzed; 2, a correction and reinforcement plan is made; 3, construction for reinforcement is conducted; and 4, construction for correction is conducted. The process for analyzing the reason for settlement and inclination comprises the steps that (1), settlement and inclination are monitored; (2), supplementary investigation is conducted; (3), the pile foundation is tested; and (4), the reason for settlement and inclination is analyzed. The process of making the correction and reinforcement plan comprises the steps that (1), the reinforcement and correction thought is determined; (2), a reinforcement and correction target is determined; (3), the characteristic value of the bearing capacity of an original single pile is determined; (4), a pile supplementing principle is determined; and (5), raft supplement is calculated. The process of conducting construction for reinforcement comprises the steps that (1), the foundation is dug; (2), an original soil body is compacted; (3), the position of a supplemented pile is determined; (4), a raft foundation is constructed; (5), column (wall) legs are reinforced; (6), a static pressure pile is constructed; (7), the quality is detected; and (8), pile sealing is conducted in a reinforcement area. The process of conducting construction for correction comprises the steps that (1), a limiting stopper is machined; (2), the limiting stopper is mounted; (3), seductive correction is conducted; (4), pile sealing is conducted in a seducing area; and (5), a seductive drilled portion is repaired, and correction and reinforcement are completed.

Description

technical field [0001] The invention relates to the technical field of deflection correction and reinforcement of foundations of existing buildings. Background technique [0002] Prefabricated piles mainly include concrete prefabricated piles and steel piles. Commonly used concrete prefabricated piles are concrete solid square piles and prestressed concrete hollow pipe piles, and steel piles mainly include steel pipe piles, H-shaped steel piles and other special-shaped steel piles. According to the different pile sinking techniques, the construction methods mainly include hammering type, static pressure type, vibration type, etc.; when the geological conditions are complex, the method of leading holes can be used for pretreatment of pile sinking. Among the more than 20 types of piles currently used in my country, prefabricated piles have fewer human factors in the process of pile formation, and the quality assurance rate is relatively high. The effect of squeezing soil in l...

AI Technical Summary

Problems solved by technology

For high-rise buildings based on prefabricated piles, using the jacking method will face the building's self-heaviness. When the prefabricated piles are used as the counter force fulcrum of the jacking system, it will accelerate the sinking and cause secondary settlement hazards; High, great influence on the building

Although the forced landing method is less risky, it is suitable for deflection correction of buildings on soft soil foundations. However, when the water content of the local foundation soil is high, the sensitivity to flow deformation is high, and high-rise buildings are self-heavy and pile foundations are often used, it is very difficult to correct deflection; Inclination rectification, heap load rectification or forced landing by rectification rectification method of foundation reinforcement will either reduce the bearing capacity of the pile tip or foundation soil, and aggravate the settlement of piles and superstructures, or the risk will be greater, the construction speed will be slow, and the settlement will be difficult to control. Uneven settlement or reverse inclination occurs again, in short, there are not many cases of quick, economical and successful deviation correction

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