Construction method of water bladder pebble mixed soil layer earth pressure shield tunnel crossing river channel

Abstract

The invention provides a construction method for crossing a river channel with an earth pressure shield machine in a mixed soil layer of water capsule pebbles, comprising the following steps: S1) in the process of using an earth pressure shield machine to cross the soil layer below the river channel during the construction stage of the tunnel concealed excavation, In the case of continuous gushing at the position of the screw machine of the earth pressure shield machine, the construction of the earth pressure shield machine is suspended; S2) Inject bentonite into the shield tail and the soil bin of the earth pressure shield machine, and then rotate the cutter head according to the predetermined interval To avoid locking of the earth pressure shield machine; S3) inject double liquid slurry behind the spacer segment wall within the predetermined range from the shield tail of the earth pressure shield machine to form a water stop ring; S4) divert the river channel, Make the new river channel after the diversion a predetermined distance from the shield tail of the earth pressure shield machine; S5) set up multiple precipitation wells at intervals along the two sides of the original river channel position, and complete the precipitation operation; S6) adjust the soil bin of the earth pressure shield machine Pressure to restore the earth pressure shield machine construction, continue to excavate through the soil layer below the original river channel with the predetermined pressure of the soil bin.

Description

technical field [0001] The invention relates to the technical field of shallow-buried underground excavation tunnels, in particular to a construction method for crossing a river channel by an earth-pressure shield tunneling in water capsule pebble mixed soil layer. Background technique [0002] The technology of earth pressure shield crossing small rivers with water-resistant layers in cities is becoming more and more mature, but the cases of crossing rivers in the stratum with rich water-rich pebble mixed soil and local "water pockets" are relatively rare, and there are relatively large construction risks and technical problems. difficulty. Contents of the invention [0003] The present invention provides a construction method for earth pressure shield tunneling in a water capsule pebble mixed soil layer and crossing a river, which avoids filling holes with open water during the construction process of the earth pressure shield machine, prevents river bottom subsidence, a...

AI Technical Summary

Problems solved by technology

[0002] The technology of earth pressure shield crossing small rivers with water-resistant layers in cities is becoming more and more mature, but the cases of crossing rivers in the stratum with rich water-rich pebble mixed soil and local "water pockets" are relatively rare, and there are relatively large construction risks and technical problems. difficulty

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