An open-type dewatering method in an ultra-deep pit-in-pit

Abstract

The invention discloses a pit opening type rainfall precipitation construction method in ultra-deep pits. The method comprises the following steps: step one, carrying out geological exploration of foundation pits, wherein the step one comprises a substep (a) of combining data of scales and places of proposed building according to the exploration technical requirements provided by design companiesand general plane graphs of buildings provided by construction companies, and combining soil drilling and extracting test with multiple field in-situ tests for comprehensively operating, wherein multiple field in-situ tests comprise static sounding, standard penetration test, heavy dynamic sounding and wave velocity and ground pulsation. The pit opening type rainfall precipitation construction method in ultra-deep pits is capable of ensuring that the foundation pits are safely digged and simultaneously reducing the underground water drawing and discharging amount to a maximum limit; the peripheral ground subsidence is also controlled in a minimum limit; the excellent rainfall precipitation effect is achieved; the idea of overall rainfall precipitation of the foundation pits is innovative;the construction processes related to the pit opening type rainfall precipitation construction method are conventional processes; the pit opening type rainfall precipitation construction method is mature in technology, simple in processes and easy to construct; the quality is easy to control; the cost can be greatly reduced.

Description

technical field [0001] The invention relates to the field of foundation pit dewatering, in particular to an open-type dewatering construction method of an ultra-deep pit in a pit. Background technique [0002] According to the previous experience of dewatering in related foundation pit projects, vertical curtains are generally adopted for dewatering of ultra-deep foundation pits to cut off the hydraulic connection inside and outside the foundation pit, so as to avoid the large damage caused by the precipitation in the pit to the environment outside the pit. However, for super large foundation pits with high water head and high water pressure under the condition of high water permeability soil and deep aquifer, the bottom-type closed precipitation will require a very deep water-stop curtain, and at the same time, the bottom of the pit needs to be fully sealed and reinforced to avoid piping, surges, etc. Safety accidents have greatly increased project investment. [0003] The...

AI Technical Summary

Problems solved by technology

However, for super large foundation pits with high water head and high water pressure under the condition of high water permeability soil and deep aquifer, the bottom-type closed precipitation will require a very deep water-stop curtain, and at the same time, the bottom of the pit needs to be fully sealed and reinforced to avoid piping, surges, etc. Safety accidents, engineering investment greatly increased

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