Complex terrain steep rock mass top-down tunnel portal tunnel entrance and construction method

Abstract

The invention provides a complex terrain steep rock mass top-down tunnel portal tunnel entrance and a construction method. The complex terrain steep rock mass top-down tunnel portal tunnel entrance comprises a safety protection channel, a channel top falling stone prevention cleaning device, a temporary reinforcing device rapidly installed on the outer side of the protection channel, a lifting jacking rack inner supporting type steel arch correcting and auxiliary inverted arch suspended formwork system. The safety of constructors is effectively guaranteed in top-down construction, the construction difficulty is reduced in tunnel body construction, and the construction efficiency is improved. The invention further discloses a complex terrain steep rock mass top-down tunnel portal tunnel entrance construction method. The method which mainly comprises the steps of tunnel opening measurement, tunnel opening primary excavation, safety protection channel installation, tunnel top disposal, tunnel body excavation, steel arch frame erection, concrete spraying, inverted arch reinforcement cage binding, end formwork hoisting and inverted arch concrete construction. The construction efficiencyis high, manpower and working hours can be saved and good economic and technical benefits are achieved.

Description

technical field [0001] The invention relates to the field of tunnels, in particular to a construction system for tunnel doorway excavation in complex terrain and steep rock mass. Background technique [0002] With the construction and development of high-grade highways in our country, some complex terrain areas also need to open roads, and correspondingly, tunnels need to be excavated in these complex terrain areas. However, it is not an easy task to excavate high-grade highway tunnels in complex terrain, and it is necessary to fully consider the terrain characteristics and ensure the safety of tunnel excavation. [0003] Tunnel reverse entry construction technology is a new type of tunnel technology, especially suitable for tunnel excavation in complex terrain. Its biggest feature is that it avoids large excavation of earth and stone, minimizes the disturbance of construction to the mountain, and can effectively prevent Dangerous situations such as landslides and slope col...

AI Technical Summary

Problems solved by technology

However, the current reverse tunnel entry construction technology cannot well guarantee the safety of construction personnel. Once problems such as rock falling occur during the construction process, the consequences will be unimaginable; at the same time, the current reverse tunnel entry construction technology is relatively difficult. Large, high requirements for construction personnel, overall construction efficiency and quality are not high

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