Construction method of drifting machine with cantilever for shallow-buried tunnel of city with strong karst and rich water

Abstract

The invention discloses a construction method of a drifting machine with a cantilever for a shallow-buried tunnel of a city with strong karst and rich water. The construction method comprises the following steps that measuring and positioning on an excavation tunnel face is conducted, and then an advanced geologic prediction system is used to conduct geological examination; the drifting machine with the cantilever and cutting picks on the drifting machine with the cantilever are adopted to excavate rocks; when stone sediments accumulate to a certain amount, an excavator is adopted to load behind the drifting machine, a transporting vehicle or a belt conveyor is used to transport the stone sediments to a vertical shaft collecting hopper, and the stone sediments are lifted to the ground through a hopper; when the drifting machine completes one excavation circulation, the drifting machine is driven back to a certain distance behind the tunnel face, an anchor rod is constructed later, and a steel truss is erected; construction of spraying concrete primary lining is conducted, and the excavated rock face is sealed; and construction of pouring secondary concrete lining is conducted, and a tunnel is formed. The construction method has the beneficial effects that the method that the drifting machine is adopted to conduct rock stratum stripping layer by layer is adopted; influence on the periphery is small; construction safety and quality are improved; construction efficiency is improved; and construction cost is reduced.

Description

technical field [0001] The invention relates to the technical field of tunnel excavation, in particular to a cantilever boring machine construction method for shallow-buried tunnels in strong karst and high-water-rich cities. Background technique [0002] Nowadays, subway construction has been widely carried out in major cities. According to the different hydrogeological conditions in different regions, the construction method of tunnel excavation is also becoming more and more perfect, especially in the bustling urban areas, where the geological conditions are complex, the buildings are dense, the traffic flow is large, and the population In many cases, in order to ensure the safety of construction and the safety of the surrounding environment during the construction process and reduce the impact on surrounding residents and buildings, during tunnel excavation, if the tunnel is located in a typical karst landform area, the probability of encountering a karst cave during the ...

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Problems solved by technology

[0002] Nowadays, subway construction has been widely carried out in major cities. According to the different hydrogeological conditions in different regions, the construction method of tunnel excavation is also becoming more and more perfect, especially in the bustling urban areas, where the geological conditions are complex, the buildings are dense, the traffic flow is large, and the population In many cases, in order to ensure the safety of the construction and the safety of the surrounding environment during the construction process and reduce the impact on the surrounding residents and buildings, during tunnel excavation, if the tunnel is located in a typical karst landform area, the probability of encountering a karst cave during the construction process is very high. The phenomenon of mud gushing and water gushing often occurs, and the integrity of the rock is also very poor. The tunnel is located in a high karst and high water-rich area, the geological conditions are quite complex, the construction safety risk is high, and the technical difficulty is high. Therefore, it is necessary to study a Applicable to the construction method of urban shallow buried tunnels in complex geological environments, solving the difficult problem of subway construction in complex geological environments in cities

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