Underground station end well front upper part air-shaft-containing structure and undercrossing construction method thereof

Abstract

The invention provides an underground station end well front upper portion air-containing shaft structure and an underneath pass construction method thereof. The underneath pass construction method comprises the following steps that S1, the ground is leveled; s2, an enclosure structure is arranged on the periphery of the air shaft; s3, soil body reinforcement is conducted within the range of the enclosure structure, and the air shaft excavation area and the shield area are covered with a soil body reinforcement area in the vertical direction; s4, an air shaft structure foundation pit is excavated, segmented and layered excavation is conducted from top to bottom, supporting is conducted firstly, then excavation is conducted, and bottom sealing is conducted immediately after the foundation pit is excavated; after the air shaft foundation pit is excavated, air shaft structure main body construction is immediately started, and base bottom plate treatment, side wall and top plate construction and connector construction are conducted; and S5, after the soil body reinforcement area meets the design strength requirement, subway tunnel shield construction is conducted, secondary grouting is matched in the shield construction process, and secondary grouting is conducted outside the duct piece so that it can be ensured that grouting behind the duct piece wall is dense. Disturbance generated by shield crossing cannot damage the air shaft structure, and the quality of the air shaft structure is protected.

Description

technical field [0001] The invention belongs to the technical field of underground engineering, and in particular relates to an air-containing shaft structure in front of an end well of an underground station and an underpassing construction method thereof. Background technique [0002] In recent years, with the rapid development of cities, more and more rail transit constructions have been built in cities, and the construction volume of foundation pits and tunnel projects has also increased greatly. For the consideration of safety ventilation during rail transit operation, the setting of air shafts is very necessary, and the related issues of air shaft construction are therefore raised. The common air shaft structure of the end well is usually designed on both sides of the vertical tunnel of the end well to reduce the disturbance of shield excavation, reduce the amount of underground engineering and construction difficulty, and ensure the safety of the air well structure. ...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide the upper air shaft structure in front of the terminal shaft of the underground station and the construction method for passing through it, so as to at least solve the current difficulty in crossing the upper air shaft structure in the deep soft soil layer.

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