A method for excavating a vertical cavern with a large diameter

Abstract

The invention discloses a method for excavating a vertical cavern with a large diameter, which comprises: excavating from the bottom passage of the vertical cavern along the outer contour design line of the cavern from bottom to top, and the contour center of the cavern is set and fixed immediately during the excavation process. The steel box culvert is used as a slag channel, and after spiral excavation to the top of the cavern, the conventional excavation method from top to bottom is adopted to complete the excavation of the vertical cavern with a large diameter. The excavation method of the present invention adopts a spiral ascending method from bottom to top, which reduces the slope of the excavation process and improves the level of mechanized use; at the same time, a steel box culvert is set in the middle of the cavern and extends upward gradually to provide a slag discharge channel; and The stability of the steel box culvert is ensured by enclosing the steel box culvert with a steel gabion. The invention saves the temporary traffic hole at the top of the cavern and the pilot tunnel expansion of the raise drilling rig through the spiral ascending excavation and the steel box culvert, saves the construction period and economic cost, is safe and reliable, and can meet the needs of large-diameter shaft opening The excavation needs of the excavation project.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower engineering construction, in particular to the technical field of underground building construction and excavation, and relates to a large-diameter vertical cavern excavation method. Background technique [0002] In hydropower construction, the excavation of most surge shafts or shafts is to excavate the pilot hole from the bottom by means of a riser, and then expand the excavation from the top to the bottom; however, for individual large-diameter vertical cavern projects, there is no Under the above conditions, it is necessary to excavate directly from the bottom to the top; the current conventional technology, blasting excavation from the bottom to the top, has a high risk factor, and the risk of falling rocks from the top is extremely high. From the perspective of safety, this conventional plan is basically eliminated. However, if we return to the raise drilling rig pla...

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Problems solved by technology

[0002] In hydropower construction, most surge shafts or vertical shafts are excavated by raising the pilot hole from the bottom, and then expanding from the top to the bottom; but for individual large-diameter vertical cavern projects, there is no Under the above conditions, it is necessary to excavate directly from the bottom up; the current conventional technology, blasting excavation from the bottom up, has a high risk factor, and the risk of rock falling from the upper part is extremely high. From the perspective of safety, this conventional solution is basically eliminated. ; and if it returns to the raising drilling rig scheme, it is necessary to build a temporary channel on the top of the cavern, which is a high price in terms of construction period cost and economic cost

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