Circular shaft spiral expanding excavation method

Abstract

The invention discloses a circular shaft spiral expanding excavation method. Before excavation, determined circular shaft expanding excavation parameters are used for designing and calculating the excavation height and footage parameters, the other parameters keep the same except for the difference between the excavation height of the first layer and the excavation heights of the other layers under the same working conditions, so that when different circular shafts are subjected to expanding excavation under the same working conditions, a blasting excavation device or a support does not need to be disassembled and assembled again, time and cost are saved, the construction efficiency is improved, the operational complexity and construction difficulty of blasting expanding excavation are greatly reduced, and the circular shaft spiral expanding excavation method is used in the field of shaft excavation technology.

Description

technical field [0001] The invention relates to the technical field of shaft excavation, in particular to a spiral type excavation method for a circular vertical shaft. Background technique [0002] The deeply buried underground caverns of hydropower stations in my country often contain multiple tunnels, and connecting tunnels need to be excavated between the tunnels, and two tunnels located on the same vertical plane need to excavate connecting shafts. In the past, vertical shaft excavation was usually excavated by reverse drilling and blasting. The excavation depth of this method was limited by the drill pipe, or the circular vertical shaft was expanded. These methods often have small excavation volumes, complex construction procedures, and low excavation efficiency. [0003] In the operation of the prior art, it is necessary to repeatedly install and disassemble the blasting excavation device for excavating a layer of rock mass, which seriously affects the construction p...

AI Technical Summary

Problems solved by technology

These methods often have small excavation volume, complicated construction procedures and low excavation efficiency.

[0003] In the operation of the prior art, it is necessary to repeatedly install and disassemble the blasting excavation device for excavating a layer of rock mass, which seriously affects the construction progress, and with each round of circular shaft excavation, the diameter of the shaft will increase, and the blasting will The excavation construction device needs to be reassembled and disassembled, which increases the complexity of shaft expansion and excavation

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