A Tunnel Excavation Construction Organization Method Based on the Three-step Method

Abstract

The invention provides a tunnel excavation construction organization method based on the three-step method. The invention innovates the tunnel excavation construction organization method, adjusts the workload of each step by mixing and arranging the operation teams, and comprehensively considers each operation. The time required for the construction of the process can match the operators of each process, the amount of work tasks, and the work time, forming a construction organization mode combining flow operation and parallel operation, which can effectively shorten the cycle time of single excavation of tunnels constructed by the three-step method , Improve the excavation construction progress.

Description

Technical field: [0001] The invention relates to a tunnel excavation construction organization method, in particular to a tunnel excavation construction organization method based on a three-step method. Background technique: [0002] At present, for tunnel engineering excavation construction methods, according to the different tunnel excavation sections and surrounding rock geology, the excavation methods used include full-section method, two-step method, three-step method, CD method, CRD method, etc. For rock geological tunnels, the three-step method is generally adopted. The basic construction steps of the three-step method are firstly to perform advance support, then drilling and blasting at each step, and initial concrete spraying, and then carry out ballasting at each step, and then carry out initial support construction such as bolt laying, vertical arches, and shotcrete. After the construction cycle is completed, the next cycle of construction will be carried out. I...

AI Technical Summary

Problems solved by technology

The main problems of this kind of organizational method are: 1. The operations such as excavation and drilling, vertical arch support, and shotcrete in this method are basically flow operations, and the connection time of each operation is relatively long, which prolongs the time of this cycle process ; 2. After re-spraying concrete, the concrete falling on the upper steps needs to be cleaned, and the upper steps need to be removed after the blasting of the face, and the upper steps need to be removed twice. The construction machinery repeats the operation many times, and the work efficiency is relatively high Low; 3. The workload of construction workers in one operation cycle is relatively small, but the entire project needs to cycle many times, resulting in long construction preparation time, short rest time, and high fatigue, which will affect construction efficiency and safety.

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