Top-down sequential-building construction method for deep and large vertical shaft cavern group

Abstract

A top-down sequential-building construction method for deep and large vertical shaft cavern groups is provided. The construction method includes the following steps. A preparation is made for a construction. A vertical shaft locking beam is constructed. A vertical shaft is constructed. A post-construction maintenance is performed. The vertical shaft is constructed through a staged construction, which includes the following steps: S 1 , constructing from a vertical shaft surface to a contact air channel elevation; S 2 , constructing a contact air channel; S 3 , constructing from the contact air channel elevation to a vertical shaft bottom. Both constructing from the vertical shaft surface to the contact air channel elevation and from the contact air channel elevation to the vertical shaft bottom include constructing a lining structure from bottom to top.

What is claimed is: 
     
         1 . A top-down sequential-building construction method for a deep and large vertical shaft cavern group, comprising preparing for a construction, constructing a vertical shaft locking beam, constructing a vertical shaft, and performing a post-construction maintenance, wherein the vertical shaft is constructed through a staged construction, comprising:
 S 1 , constructing from a vertical shaft surface to a contact air channel elevation;   S 2 , constructing a contact air channel; and   S 3 , constructing from the contact air channel elevation to a vertical shaft bottom,   wherein both constructing from the vertical shaft surface to the contact air channel elevation and constructing from the contact air channel elevation to the vertical shaft bottom comprise constructing a lining structure from a bottom to a top.   
     
     
         2 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 1 , wherein constructing the lining structure comprises: mounting a single-side cantilever climbing formwork; performing a symmetric and layered concrete pouring; and removing a formwork, wherein a formwork removal strength required for removing the formwork is ≥100%, and the single-side cantilever climbing formwork is a detachable and reusable climbing formwork. 
     
     
         3 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 1 , wherein each stage of constructing the vertical shaft comprises performing a blasting, performing an excavation, and providing a support sequentially, wherein the blasting adopts a full-face one-time blasting and a layered integral blasting; after the blasting, the excavation is performed by an excavator, and a slag soil generated from the excavation is hoisted and removed; and providing the support comprises providing a primary support and constructing the lining structure sequentially. 
     
     
         4 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 3 , wherein providing the primary support comprises performing a preliminary shotcrete spraying, a steel grid construction, a steel mesh construction, a hollow grouting anchor construction, and a secondary shotcrete spraying. 
     
     
         5 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 3 , wherein the vertical shaft is horizontally and sequentially divided into a vertical shaft ascending and descending ladder space, a vertical shaft slag removal hoisting channel, and an excavator parking area, wherein a slag hoisting equipment is disposed within the vertical shaft slag removal hoisting channel, the excavator and the slag hoisting equipment are staggered with each other, and a protective steel plate is disposed at a top of the excavator parking area. 
     
     
         6 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 1 , wherein an upper and lower bench method is adopted to construct a tunnel portal transition portion of the contact air channel into a tunnel, a reinforced section is disposed on a tunnel portal connecting the vertical shaft and the contact air channel, and a tunnel portal portion of the contact air channel and a vertical shaft wall are integrally poured. 
     
     
         7 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 6 , wherein when constructing the contact air channel, an inside-out lining structure construction method is adopted for constructing the lining structure. 
     
     
         8 . The top-down sequential-building construction method for the deep and large vertical shaft cavern group according to  claim 1 , wherein constructing from the contact air channel elevation to the vertical shaft bottom and constructing from the vertical shaft surface to the contact air channel elevation comprise an identical workflow of performing an excavation, providing a support, and performing a lining pouring.