Raise boring method construction method for 200-600m ventilation shaft of highway extra-long tunnel

Abstract

The invention provides a raise boring method construction method for a 200-600m ventilation shaft of a highway extra-long tunnel, and belongs to the technical field of highway tunnel shaft construction methods. The raise boring method construction method comprises the following steps that S1, a shaft locking ring constructed; S2, guide hole is constructed, specifically, a, the guide hole is constructed from top to bottom through a deep hole down-the-hole drill; b, the guide hole is reamed to the bottom of the hole from top to bottom by a raise boring machine, and the guide hole communicates with an excavated main hole communication channel in the lower part; and c, the raise boring machine is connected with a reamer bit in the underground communication channel, raise-boring reaming construction is conducted on a pilot shaft from bottom to top, and the pilot shaft serves as a blasting free face and a ventilation slag sliding channel during blasting construction of a vertical shaft; S3,a vertical shaft lifting suspension system is built; S4, shaft tunneling and preliminary bracing are conducted, specifically, blasting excavation is conducted from top to bottom till a designed vertical shaft excavation section is formed, and preliminary supporting is conducted; and S5, vertical shaft lining sliding formwork construction is conducted, specifically, concrete is integrally poured into the vertical shaft from bottom to top through hydraulic sliding formworks. The construction method is high in construction efficiency, good in quality control, high in construction progress and high in adaptability.

Description

technical field [0001] The invention belongs to the technical field of construction methods for shafts of highway tunnels, and specifically discloses a construction method of a 200-600m ventilation shaft of an extra-long highway tunnel by the "reverse shaft method". Background technique [0002] With the increasing construction of extra-long highway tunnels and the increasing variety of structural forms, higher requirements are put forward for the safety, quality and progress of construction. Considering the safety and economic considerations during the operation of extra-long tunnels, most of them adopt vertical shaft ventilation, lower excavation method, and climbing machine construction method as the traditional vertical shaft construction methods, which have the problems of low construction efficiency and poor safety. Contents of the invention [0003] The purpose of the present invention is to provide a construction method of "reversed shaft method" for a 200-600m ven...

AI Technical Summary

Problems solved by technology

Considering the safety and economic considerations during the operation of extra-long tunnels, most of them adopt vertical shaft ventilation, lower excavation method, and climbing machine construction method as the traditional vertical shaft construction methods, which have the problems of low construction efficiency and poor safety.

Images