Step type inspection well structure for thermal insulation center trench below tunnel inverted arch

Abstract

The invention discloses a step type inspection well structure for a thermal insulation center trench below a tunnel inverted arch. The step type inspection well structure comprises a deep-buried center trench thermal-insulation inspection well and a deep-buried tunnel center trench, wherein the deep-buried center trench thermal-insulation inspection well is equipped with lateral step ladders from top to bottom in the longitudinal direction of a path, the lower ends of the lateral step ladders are connected with the deep-buried center trench thermal-insulation inspection well through maintenance platforms, and open holes capable of allowing implementation of inspection and maintenance work for the deep-buried tunnel center trench through the deep-buried center trench thermal-insulation inspection well are formed in the positions, corresponding to the maintenance platforms, of the deep-buried center trench thermal-insulation inspection well; cover plates are arranged at the tops of the lateral step ladders for closing, and an oil-immersed wood cover plate and a thermal-insulation layer are arranged in the position, having equal altitude with the top surfaces of the maintenance platforms, of the deep-buried center trench thermal-insulation inspection well for closing and thermal insulation. According to the step type inspection well structure for the thermal insulation center trench below the tunnel inverted arch, concrete project quantity of the tunnel bottom structure is reduced, cold-proof and thermal-insulation capacity of a tunnel drainage system is improved, and operation difficulties in inspection and maintenance of deep-buried drainage facilities of the tunnel are reduced, so that the operation safety of the tunnel is guaranteed.

Description

technical field [0001] The invention belongs to a tunnel inspection well structure, in particular to a step-type inspection well structure of a thermal insulation central ditch under an inverted arch of a tunnel. Background technique [0002] Engineering practice experience shows that deep-buried tunnel drainage facilities are the key to thermal insulation and drainage of tunnels in cold regions, and can effectively prevent adverse diseases such as lining ice hanging, track bed ice accumulation, and floor heaving. In order to ensure unobstructed drainage of tunnels in cold regions during operation, inspection wells in central trenches are usually set at regular intervals along the longitudinal direction of tunnel deep-buried drainage facilities for necessary inspection and maintenance of tunnel deep-buried drainage systems during operation. [0003] Existing tunnel central ditch inspection wells are generally vertical shafts. During inspection and maintenance operations, it ...

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Problems solved by technology

However, limited by the clear space inside the tunnel, the net size of the cross-section of the central ditch inspection shaft is often set only to meet the requirements of necessary maintenance operations, and in order to meet the requirements of thermal insulation and drainage of tunnels in cold regions, tunnel deep-buried drainage facilities are generally set outside the tunnel structure to a certain extent. In the deep surrounding rock, the inspection well in the center trench of the tunnel in the cold region is deeper than that in the general mild region. In addition, the section itself is smaller, which makes the inspection and maintenance of the tunnel drainage system in the cold region more difficult and workload during operation.

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