High-impermeable anti-floating pile raft structure and construction method

Abstract

The invention relates to a high-impermeable anti-floating pile raft structure. The high-impermeable anti-floating pile raft structure is characterized in that a pre-stress hollow tube section is arranged at the upper portion of a bored pile, the pre-stress hollow tube section is concentric with the bored pile, a reinforcement cage of the bored pile penetrates through the pre-stress hollow tube section and extends into a raft foundation to be connected with a raft inner reinforcing steel bar, an inner connection rib is arranged on the inner side of the pre-stress hollow tube section, and a sand cushion layer and a gravel blind ditch are laid at the upper portion of foundation soil. The raft foundation is sequentially provided with a horizontal water-resisting layer, a cemented soil board and a reinforced concrete raft board from bottom to top. A foundation pit support pile and a wall body of a side wall of a basement are fixedly connected through reinforcing rib materials. The high-impermeable anti-floating pile raft structure can enhance the integrity and strength of an upper portion structure, can reduce uplift pressure of underground water and can fully utilize waste slurry of the bored pile to achieve waste utilization. The pre-stress hollow tube section is arranged at the top of a pile body, so that a pile cutting work process of the bored pile is removed, and the construction efficiency is improved. The invention further discloses a construction method of the high-impermeable anti-floating pile raft structure.

Description

technical field [0001] The invention relates to a pile raft structure, belonging to the field of foundation treatment, which can improve the bearing capacity of the foundation, enhance the integrity of the upper structure, reduce the water pressure of the raft slab, and facilitate construction organization. It is suitable for large-scale building foundation projects, especially for docks, airports, Logistics yards and other foundation projects that have high requirements for anti-floating and anti-seepage of pile foundations and rafts. Background technique [0002] With the rapid development of urban construction, a large number of high-rise buildings, underground garages, sunken squares, subways, underground shopping malls and other buildings have put forward higher requirements for the utilization of underground space. However, in coastal cities such as Shenzhen, Dalian, and Qingdao, where the underground soil is rich in water, the buoyancy of the groundwater caused by the...

AI Technical Summary

Problems solved by technology

The uplift anchor pulls the basement structure as a whole and the rock layer or hard soil layer through its own tensile strength. The uplift anchor is usually arranged under the raft foundation, but the uplift anchor cannot bear the downward load, which is easy to cause damage to the building materials. waste

[0005] In summary, although the existing anti-floating and anti-seepage measures have achieved good results under suitable engineering conditions, the existing structures still have certain deficiencies in actual engineering, such as increased structural weight and difficulty in design and construction. , low utilization rate of materials, etc.

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