Non-blasting cutting excavation construction method for large-span underground cavern

Abstract

The invention provides a non-blasting cutting excavation construction method for a large-span underground cavern, and relates to the technical field of large-span excavation. The construction method comprises the following steps of (1), carrying out blasting excavation on a top arch layer; (2), cleaning a working surface; (3), measuring and setting point; (4), installing rails; (5), carrying out disc saw cutting; (6), taking materials from a foundation trench; (7), carrying out stone decomposition; and (8), carrying out stone transportation and storage. According to the method, two cutting modes, namely disc saw cutting and wire saw cutting, are adopted, a saw blade of a disc saw and a diamond string bead wire of a wire saw generate strong cutting force to act on rock through mechanical action, stone is cut apart and decomposed through continuous rotation of the saw blade and rotary cutting of the diamond string bead wire, the purpose of excavation and construction is achieved, the method has the beneficial effects that the tunnel excavation blasting operation risk is reduced, the construction period is shortened, the tunnel excavation quality is improved, and the construction costis reduced.

Description

technical field [0001] The application relates to the technical field of large-span excavation, in particular to a construction method for excavating large-span underground caverns without blasting and cutting. Background technique [0002] At present, the excavation of underground caverns of pumped storage power stations still adopts the traditional new Austrian method or mining method. figure 1 It is a schematic diagram of cavern blasting excavation in the prior art, such as figure 1 As shown, the drilling and blasting excavation with equipment such as hand-pneumatic drills and multi-arm drilling rigs are mainly used; the disadvantage is that traditional blasting excavation cannot be carried out in a 24-hour cycle due to the constraints of detonator and explosive management. The blasting vibration is large, which has a great impact on the integrity of the lower rock formation. During the excavation process, reinforcement and support are often added due to the impact of bl...

AI Technical Summary

Problems solved by technology

figure 1 It is a schematic diagram of cavern blasting excavation in the prior art, such as figure 1 As shown, the drilling and blasting excavation with equipment such as hand-pneumatic drills and multi-arm drilling rigs are mainly used; the disadvantage is that traditional blasting excavation cannot be carried out in a 24-hour cycle due to the management of detonators and explosives

The blasting vibration is large, which has a great impact on the integrity of the lower rock formation. During the excavation process, reinforcement and support are often added due to the impact of blasting vibration, and even the cavern collapses.

The quality of the excavation process is difficult to meet the design requirements

High safety risks, low construction efficiency, poor working environment, high investment of construction personnel and complicated construction organization

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