Construction method of shield passing through railway yard

Abstract

The invention discloses a construction method of a shield passing through a railway yard. Grouting is performed through a plurality of sleeve valve pipes inclining below a line on two sides of a stop to form a whole by single-side connection and double-side connection; bottom earth of the railway line is integrally enhanced; autostability of the earth is improved. By controlling tunneling parameters, reasonably controlling earth pressure and volume of extracted earth and performing high-rate segment gap synchronous grouting, stability of an excavation face is ensured, earth disturbance is decreased, strong support force is provided for the earth by segments, and settlement or collapse of th earth during tunneling is avoided. Reinforcement is achieved by grouting with steel perforated pipes at a tunneling rear arch portion; late settlement of the earth is avoided. The construction method has the advantages that earth settlement is all-directionally controlled in the construction of the field passing through the railway yard, construction safety risks are decreased, and the construction of the shield passing through the railway yard under severe geological conditions is achieved.

Description

technical field [0001] The invention relates to a tunnel construction method, in particular to a construction method for a shield tunnel passing through a railway station. Background technique [0002] With the rapid development of urban rail transit construction, shield tunnel construction often needs to pass through dense building groups, existing railway lines, or near permanent buildings and municipal public facilities that must be protected, and ground settlement and municipal utilities must be strictly controlled. Displacement, which brings difficulties to shield tunnel construction. Especially in the case of unfavorable geological conditions such as silt layer, sandy pebble layer and water-bearing stratum at the same time, its construction is more difficult; in shield construction, it is easy to cause disasters such as excessive ground subsidence and ground collapse, which will damage the surrounding buildings. , underground structures, pipelines, stations and other ...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of urban rail transit construction, shield tunnel construction often needs to pass through dense building groups, existing railway lines, or near permanent buildings and municipal public facilities that must be protected, and ground settlement and municipal utilities must be strictly controlled. Displacement, which brings difficulties to shield tunnel construction

Especially in the case of unfavorable geological conditions such as silt layer, sandy pebble layer and water-bearing stratum at the same time, its construction is more difficult; in shield construction, it is easy to cause disasters such as excessive ground subsidence and ground collapse, which will damage the surrounding buildings. , underground structures, pipelines, stations and other safety pose a great threat

In particular, under the harsh geological conditions mentioned above, when passing through a large railway station, the construction is particularly difficult due to the large traffic flow of the station and the short construction time.

Images