Steel frame based on mechanical full-face excavation of tunnel, and construction method thereof

Abstract

The invention discloses a steel frame based on mechanical full-face excavation of a tunnel, and a construction method thereof. The steel frame comprises an arch part grid steel frame unit and side part grid steel frame units located at two ends of the arch part grid steel frame unit, wherein the arch part grid steel frame unit and the side part grid steel frame units are hinged to be prefabricatedinto a whole structure in a factory. From the angle of force loading, according to the steel frame provided by the invention, the number of the steel frame units and connecting joints is greatly reduced, the weakening on the overall force loading strength of the steel frame is reduced maximally, the supporting intensity of the steel frame is ensured, the steel frame forms a whole, the positioningdifficulty is low and the efficiency is high after lifting, the steel frame can be directly lifted as a whole through a multi-arm steel frame installation trolley, mechanical operation is realized, the number of construction operation personnel is reduced, the construction safety is improved, a working environment for the construction personnel is favorable, the human cost and the labor intensityare saved, the operating time of a single process can be greatly reduced, the operation progress of tunnel initial supporting construction is accelerated as a whole, the economic benefit is remarkable, and the construction cost is saved.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a steel frame based on tunnel mechanized full-section excavation and a construction method thereof. Background technique [0002] At present, my country's high-speed railway mountain tunnels basically adopt a composite lining support structure, which includes primary support and secondary lining. This is an effective support method developed based on the New Austrian Method. Among them, the initial support structure is extremely important in the construction process and directly affects the construction safety. Generally, the combined structure of shotcrete and anchor net is adopted, and grid steel frame or section steel frame is installed in IV and V grade surrounding rock sections to strengthen the support. However, in the traditional tunnel construction process, limited by the theory, technology, technology, and equipment, most of them adopt the artificial multi-step constru...

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems existing in the prior art that the supporting steel frame in the initial stage of tunnel construction is installed manually through mechanical arms, which requires high construction precision, low construction efficiency, long single-process time, poor economy and high cost. In view of the above deficiencies, a steel frame and its construction method based on tunnel mechanized full-section excavation are provided.

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