Method for supporting deep foundation pit

Abstract

The invention relates to a method for supporting a deep foundation pit, which includes the steps: firstly, driving in a plurality of hollow pipe piles with lower-end closed tips around a pit foundation to be supported; secondly, placing a reinforcement cage with a grouting pipe into each hollow pipe pile and fixing the reinforcement cage in the center of the hollow pipe pile; thirdly, pouring concrete of certain strength into each hollow pipe pile, and vibrating to compact the concrete; and fourthly, after prehardening of the concrete, filling grout of certain concentration into each hollow pipe pile from the upper end of the corresponding grouting pipe, and obtaining one supporting pile when the concrete and the grout in the corresponding hollow pipe pile set finally. The support piles and ring beams or inner supports form a supporting system. The prestressed hollow pipe piles fast in production are used, so that operational construction is convenient and fast. Reinforced core filling and post-grouting are adopted for the cavity of each hollow pipe pile, so that bending resistance of the original hollow pipe piles is improved greatly, and the technical requirements of foundation pit supporting are met.

Description

technical field [0001] The invention relates to a deep foundation pit supporting method. Background technique [0002] The investment in national urban construction has increased. In order to save limited land space, many high-rise buildings and underground passages have also been formed. Deep foundation pits are very widely used in these and other similar large-scale projects. Deep foundation pit support technology is particularly important. Especially in soft soil areas with high groundwater level and complex surrounding environment, when the support structures such as cement soil and soil nail wall cannot meet the safety requirements of foundation pits, row piles or underground diaphragm wall support structures are generally used. Since cast-in-situ piles or prefabricated solid piles are conventionally used for row piles, the construction progress of cast-in-situ piles is slow, and prefabricated solid piles cannot be produced in production lines at present, and the qual...

AI Technical Summary

Problems solved by technology

Especially in soft soil areas with high groundwater level and complex surrounding environment, when the support structures such as cement soil and soil nail wall cannot meet the safety requirements of foundation pits, row piles or underground diaphragm wall support structures are generally used

Since cast-in-situ piles or prefabricated solid piles are conventionally used in row piles, the construction progress of cast-in-situ piles is slow, prefabricated solid piles cannot be produced in production lines, and the quality varies greatly.

If the general pretensioned prestressed hollow pipe pile is used, it is difficult to meet the requirements due to its poor bending resistance.

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