Anti-sloughing device for top unstable exposed karst cave in tunnel construction and construction method

Abstract

The invention discloses an anti-sloughing device for a top unstable exposed karst cave in tunnel construction and a construction method, the anti-sloughing device comprises a vertical support and an arched support, the vertical support is located in a tunnel, and the vertical support is arranged along a tunnel face of the tunnel; the arched support extends along the designed top surface of the tunnel, and the top of the vertical support is connected with the arched support through a spring buffer; inflatable tarpaulin is fixedly arranged between the edges of the two sides of the arched support, and a height adjusting assembly is arranged between the arched support and the inflatable tarpaulin; and a self-sealing assembly is arranged on the inflatable tarpaulin. The anti-sloughing device can be tightly attached to the top face of the karst cave, and the overall stability of the anti-sloughing device can be improved.

Description

technical field [0001] The invention relates to the technical field of tunnel support, in particular to an anti-collapse device and a construction method for an unstable top exposed karst cave during tunnel construction. Background technique [0002] The 19th century is the era of bridges, the 20th century is the era of high-rise buildings, and the 21st century is the era of underground spaces. The construction has greatly improved the convenience of transportation in the western mountainous area. At present, my country has become one of the countries with the largest tunnel construction scale, technology and difficulty in the world. At the same time, the focus of highway and railway construction is gradually shifting to the western mountainous areas with highly developed karst, which will bring huge challenges to geological survey, construction safety and ecological environment. [0003] Karst is a very common geological phenomenon on the earth. It develops from high moun...

AI Technical Summary

Problems solved by technology

[0005] During the excavation of the tunnel, karst caves will be encountered. The existing support mainly adopts concrete retaining wall or spray anchor support technology, and its support capacity cannot achieve the expected support effect under such complex geological conditions, mainly because The support structure and the karst cave are not tightly combined and cannot be deformed together

The utility model patent with the publication number CN212454440U discloses a fast support structure for the exposed karst cave on the single side wall of the tunnel. The support structure can make the support structure closely fit the top of the karst cave. It will affect the telescopic rod, causing the displacement or deformation of the telescopic rod, thus affecting the support effect

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