Construction method used for slurry balance shield to underneath pass through river

Abstract

The invention discloses a construction method used for a slurry balance shield to underneath pass through a river and mainly relates to the field of shields. According to the technical scheme, the construction method comprises the steps of preparatory measures, shield long-distance tunneling measurement and tunneling construction of underneath passing through a river bottom section by the shield, wherein shield long-distance tunneling measurement is conducted as follows: selecting of a soil bin pressure value, setting of propelling force and the propelling speed n, synchronous grouting and grouting supplementing. Shield posture and segment model selection are conducted, specifically, at the construction stage of a shield tunneling machine, the axis of a tunnel deviates from the designed axis by no more than + / -50 mm. Work of leakage prevention, emitting prevention, sinking prevention, plugging prevention, floating prevention and the like can be realized, and smooth conducting of construction that the shield tunnel underneath passes though the river is effectively guaranteed.

Description

technical field [0001] The invention relates to a construction method for mud-water balance shield tunneling through rivers, and mainly relates to the field of shield tunneling. Background technique [0002] There are many risks faced by shield tunnels passing through rivers: [0003] (1) The shield tail seal fails under high water pressure at the bottom of the river, which may easily cause slurry leakage at the shield tail. [0004] (2) Shallow covering of shield tunnel and improper control of mud-water pressure may easily lead to collusion between shield tunnel and river, resulting in river bottom collapse. [0005] (3) The groundwater pressure at the bottom of the river is high, which causes the segments to float up and the posture control of the shield machine is difficult. [0006] (4) The long-distance excavation of the shield machine at the bottom of the river may cause serious tool wear, and the operation of entering the warehouse with pressure is carried out at th...

AI Technical Summary

Problems solved by technology

[0003] (1) The shield tail seal fails under high water pressure at the bottom of the river, which may easily cause slurry leakage at the shield tail

[0004] (2) Shield tunnels are covered with shallow soil and muddy water pressure is not properly controlled, which can easily lead to the collusion between shield tunnels and rivers, resulting in river bottom collapse

[0005] (3) The groundwater pressure at the bottom of the river is high, which causes the segments to float up and the posture control of the shield machine is difficult

[0006] (4) The long-distance excavation of the shield machine at the bottom of the river may cause serious tool wear, and the operation of entering the warehouse with pressure in the bottom of the river

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