High-permeability zone under-water-level elevator foundation pit open caisson moulding bed construction method

Abstract

The invention discloses a high-permeability zone under-water-level elevator foundation pit open caisson moulding bed construction method. The method includes the steps of foundation trench positioning and setting out, foundation pit bottom plate leveling, open caisson production and formation, open caisson sinking, open caisson bottom sealing, plain concrete backfilling of the periphery of the outer side of an open caisson, elevator shaft slope angle backfilling in the open caisson, and the like. By the method, slope setting amount of elevator shaft pit and catchpit soil excavation of construction is decreased, foundation soil disturbance is reduced, and foundation pit side wall brick moulding bed masonry and formwork pouring of a concrete cushion is replaced. Construction period is longer than that of normal construction, sand gushing and soil layer collapse are avoided in a foundation pit soil excavation process for special soil layer elevator shaft and catchpit construction, the problem that quicksand and collapse of the foundation pit wall are difficult to avoid under the circumstance of the underground water level with high-permeability coefficient is solved, and cost for quicksand and collapse management is saved by a large amount.

Description

technical field [0001] The invention relates to a tire formwork construction method for an elevator foundation pit caisson under the water level of a high permeability layer. Background technique [0002] Elevator well pits in high-rise buildings and basements with large buried depths are generally about 2.0m deeper than the basement floor, and when the groundwater level is high and the groundwater permeability coefficient of the base layer is high, the precipitation in the elevator well pits will often be larger. The difficulty of construction and the increase of a lot of costs. Contents of the invention [0003] The object of the present invention is to provide a method for constructing a caisson tire formwork for an elevator foundation pit under the water level of a high-permeable layer with convenient construction and good effect. [0004] Technical solution of the present invention is: [0005] A method for constructing a caisson tire formwork for an elevator founda...

AI Technical Summary

Problems solved by technology

[0002] Elevator well pits in high-rise buildings and basements with large buried depths are generally about 2.0m deeper than the basement floor, and when the groundwater level is high and the groundwater permeability coefficient of the base layer is high, the precipitation in the elevator well pits will often be larger. The difficulty of construction and the increase of a lot of costs