Method and supporting construction for enlarging basement top-down method earth excavation space

Abstract

The invention discloses a method for digging earth to form space in an inverse method for enlarging a basement. The method is applied to a basement foundation ditch of a support system which forms the peripheric space enclosing structure of the basement, supporting steel pipe columns in the middle, the floor slab structure of + / - 0.000 floor and the floor slab structure of the first floor underground by construction. A floor slab crossing the floor along the periphery of the basement on the second floor underground is first constructed, then a steel pipe is used for upwards and obliquely supporting the steel pipe column which is topped to the inward floor of the first floor underground from the steel pipe column at the side of the floor slab crossing the floor, a mutual opposite vertex bracing structure which can transmit side pressure transmitted from the peripheric space enclosing structure of the floor slab of the first floor underground first by the floor slab which is constructedon the second floor underground and then by the steel pipe which is obliquely supported is formed, thereby space in which earth for two floors can be fully dug is formed. The invention also disclosesa supporting structure. By the actual operation of the method, under the circumstance that the floor slab structure of the second floor underground does not need to be fully constructed, enough upperlever rigidity can be ensured to enable the earth of the second floor underground and the third floor ground of the basement to be dug once by a large type pullshovel excavator, thereby the degree ofadvancement for digging the earth of the basement is greatly enhanced, and obvious economic benefit and social benefit are obtained.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method and a supporting structure for enlarging the earthwork excavation space of a basement by reverse method. Background technique [0002] The upside-down method is a new deep foundation pit construction technology developed in the past ten years. Its principle is: first construct an underground diaphragm wall or make enclosure structures such as densely packed enclosure piles along the outer walls around the basement of the building, and at the same time construct the enclosure structure in the basement of the building The center of the column and the intersection of the vertical and horizontal frame beams and the shear wall are poured or laid down in the middle support piles and columns, as the support for bearing the self-weight and construction load of the upper structure during the construction period before the bottom plate is sealed; then the beam-slab bu...

AI Technical Summary

Problems solved by technology

In this way, the earthwork excavation headroom height of the bottom floor of the basement cannot meet the excavation construction by large and medium-sized backhoe excavators, but can only be excavated by manual or mini-excavators, and the construction progress will be very slow

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