A high water level soft soil foundation pit nail wall support structure system and construction method

Abstract

The invention discloses a high water level soft soil foundation pit frozen soil nailing wall support structure system. The high water level soft soil foundation pit frozen soil nailing wall support structure system comprises a plurality of freezing pipes vertically drilled along the ground on the periphery of a foundation pit, a plurality of steel pipe type soil nails drilled from the slope surface of a side slope of the foundation pit and arrayed regularly and concrete scour-prevention panels installed on the outer side wall of the slope surface of the side slope of the foundation pit. Frozen soil waterproof curtain walls perpendicular to the ground on the periphery of the foundation pit are installed at the lower ends of the freezing pipes and locates below the underground water line; and the freezing pipes are installed in the portions, located above the underground water line, of the steel pipe type soil nails, the freezing soil anchoring heads are installed at the tail ends of the portions, located above the underground water line, of the steel pipe type soil nails, and the tail ends of the rest steel pipe type soil nails are drilled into the frozen soil waterproof curtain walls to be anchored. The high water level soft soil foundation pit frozen soil nailing wall support structure system has the advantages that support cost is low, the construction period is short, the environment is not polluted, the problems that the upper layer soil nails are easy to pull out, and the uplift resistant bearing capacity of the lower layer soil nails is insufficient are solved, and meanwhile high water retaining capacity is achieved.

Description

technical field [0001] The invention relates to a frozen soil nailing wall support construction project, in particular to a frozen soil nailing wall support structure system and a construction method for a high water level soft soil foundation pit. Background technique [0002] Due to the shortage of land resources, a large number of high-rise and super high-rise buildings have emerged in urban construction, and there are more and more deep foundation pit projects. The general construction method of deep foundation pit support is complicated, with high safety risks and high project cost. Choose the appropriate support method It is especially important to ensure the safety of foundation pits and save construction costs. At present, the support methods commonly used in soft soil areas with high water levels include bored occlusal piles and underground diaphragm walls. The bored occlusal pile is a foundation pit support structure in which the bored pile and the cement-soil mix...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a high water level soft soil foundation pit permafrost nail wall support structure system and construction method, which has low support cost, short construction period, no pollution to the environment, and solves the problem that the upper soil nails are easy to be pulled out. Insufficient pull-out bearing capacity of soil nails in the upper and lower layers, and also has a strong water-retaining capacity