Watertight structure for retaining wall of ultra-deep manually excavated pile and construction method thereof

Abstract

The invention relates to a watertight structure for a retaining wall of an ultra-deep manually excavated pile and a construction method thereof. According to the watertight structure and the construction method thereof, the retaining wall of each excavated pile is formed through the upper and lower connection of cast-in-situ reinforced-concrete retaining wall construction sections section by section, a watertight curtain deeply penetrates below a soil layer with strong water permeability, the inside diameter of a lower opening of the inner side face of each retaining wall construction section is greater than that of an upper opening of the inner side face of each retaining wall construction section, an annular boss is formed at the joint of an upper retaining wall construction section and a lower retaining wall construction section, and watertight sealing slurry is filled in an internal corner formed by the boss and a front retaining wall construction section; cast reinforced concrete of the retaining wall construction sections is ordinary reinforced concrete or anti-permeability reinforced concrete with an anti-permeability agent; the watertight sealing slurry is polymeric cement slurry or slurry formed through mixing water glass, cement and water. The watertight structure and the construction method thereof have the advantage that the technical problems that the quality of the excavated pile is affected caused by the fact that the retaining wall of the manually excavated pile is subjected to water permeation when the manually excavated pile passes through a gravel stratum with rich groundwater and strong water permeability or complicated stratums with large water flow, high gravel mobility and the like, the construction period is relatively long, and hidden security risks are caused due to the damage to surrounding buildings arising from damaged stratum structure are solved.

Description

technical field [0001] The invention belongs to the field of foundation pit support engineering, in particular to a water-stop structure for retaining walls of artificially dug hole piles in super-deep and large foundation pits and a construction method thereof. Background technique [0002] The manual digging pile is a kind of non-squeezing soil pile, which has a high bearing capacity of a single pile, and has the advantages of simple construction, fast construction speed, and no need for large-scale mechanical equipment. At the same time, the earthquake resistance of artificial excavated piles is stronger than that of wooden piles and concrete driven piles. It is widely used in engineering construction. [0003] General artificial hole-digging piles are suitable for strata without groundwater or clay stratum with less groundwater, silty clay stratum, and clay stratum with a small amount of sand, sand pebbles and gravels. It is not suitable for strata with quicksand or h...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide an ultra-deep artificial excavation pile retaining wall water-stop structure and its construction method, to solve the problem that the artificial excavation pile passes through the gravel layer with rich groundwater and strong water permeability or complex strata with large water flow and high fluidity of gravel. At the same time, the water seepage of the retaining wall of the manual excavation piles affects the quality of the excavation piles, and the construction period is long. Due to the destruction of the stratum structure, it directly leads to the damage of the surrounding buildings and causes major safety hazards.

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