A construction method for shield tunneling across railway yards

Abstract

The invention discloses a construction method for shield tunneling across a railway station. On both sides of the platform, a plurality of sleeve valve pipes inclined to the bottom of the line are grouted to form a single-side connection and two-side co-connection to form a whole, so that the railway line The soil at the bottom is reinforced as a whole, which improves the self-stability of the soil. Through the control of the excavation parameters, the reasonable control of the earth pressure and the excavated volume, and the synchronous grouting of the high-magnification sheet gaps during the excavation, the stability of the excavation surface is ensured, the soil disturbance is reduced, and the sheet body provides the soil. Strong supporting force prevents the subsidence or collapse of the soil during excavation. The later settlement of the soil is avoided by grouting reinforcement of the steel flower tube in the arch after excavation. The construction method fully realizes the control of the settlement of the soil layer during the construction of the shield tunneling through the station, reduces the safety risk of construction, and realizes the construction of the shield tunneling through the railway station under harsh geological conditions.

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.

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