Subway tunnel shaft entering construction method and construction shaft supporting structure in loess area

Abstract

The invention discloses a subway tunnel shaft entering construction method and a construction shaft supporting structure in a loess area. The construction method is characterized in that a vertical shaft to be excavated is divided into a first half area and a second half area, the first half area and the second half area are excavated in sequence, and spray anchor supports and concrete supports are arranged in the excavation process; then an underground area is divided into multiple parts to be excavated in sequence, the concrete supports and temporary supports are arranged in time every timeone part is excavated, after all the parts are excavated, the temporary supports are dismantled, and the concrete supports of the two parts on the same side are connected to form a support ring. According to the method, on the basis of the thought of progressively increasing from small to large, construction is carried out in a regional and blocked mode, and supporting is set in time to ensure safety; and in accordance with construction method, on the premise of ensuring safety and occupying overground building land as little as possible, a large underground construction space can be obtained,and therefore the method has the characteristics of high practicability and high safety.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a subway tunnel well entry construction method and a construction well support structure in loess areas. Background technique [0002] As the urban population increases, the traffic becomes more and more congested, and the construction of subway tunnels has become an effective way to alleviate traffic congestion. Loess strata are widely distributed in my country, and more and more subways are built in loess strata. The construction period of subway tunnels is generally relatively tight. In order to increase the construction progress, vertical shafts are often used to increase the working surface. At present, the commonly used method is to set up vertical shafts on one side of the tunnel, and then excavate through the cross passage to form the working surface. This method is safer. High, but the disadvantage is that the construction land area is relatively...

AI Technical Summary

Problems solved by technology

The construction period of subway tunnels is generally relatively tight. In order to increase the construction progress, vertical shafts are often used to increase the working surface. At present, the commonly used method is to set up vertical shafts on one side of the tunnel, and then excavate through the cross passage to form the working surface. This method is safer. High, the disadvantage is that the construction area is relatively large

However, due to the limited scope of construction land in cities, it is difficult to carry out land acquisition and demolition, and often cannot meet the aforementioned construction methods.

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