Shield large-gradient launching construction method

Abstract

The invention relates to a shield large-gradient launching construction method. The shield large-gradient launching construction method comprises the following steps that a portal steel ring is provided, and the portal steel ring is pre-buried in the side wall of a working well according to the design axis of a shield tunnel; a launching frame is provided, the provided launching frame is providedwith an inclined receiving plate, and the launching frame is annularly arranged above the bottom of the working well corresponding to the portal steel ring; a reaction frame is provided, the side, close to the launching frame and away from the portal steel ring, of the reaction frame is arranged above the bottom of the working well, and the reaction frame is perpendicular to the launching frame; and a shield tunneling machine is provided, the shield tunneling machine is hoisted to the receiving plate, and the shield tunneling machine is moved into the portal steel ring and tunneled into the soil body. When the shield tunneling machine enters the soil body, the center line of the shield tunneling machine can be closer to the inclined design axis, so that the center line of the shield tunneling machine is close to the design axis of a shield tunnel, and the deviation rectifying difficulty of the shield tunneling machine is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to a large-slope starting construction method of shield tunneling. Background technique [0002] It is a fully mechanized construction method in the shield excavation method. It is to propel the shield machine in the ground, and support the surrounding rock through the shield casing and segments to prevent collapse into the tunnel. A mechanized construction method in which the soil is excavated with a cutting device in front of the tunnel, transported out of the tunnel by excavation machinery, pushed in by jacks at the rear, and assembled with precast concrete segments to form a tunnel structure. [0003] Water conservancy and electric power tunnels are large-slope tunnels, and the tunnels are not open to traffic. The design slope of the tunnel is 45‰, and the design slope of some tunnels is 50‰. If the shield tunnel has a certain design slope, the design axis of the...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art, and to provide a large-slope starting construction method of the shield to solve the existing problem of tunnel construction with a large slope. The deviation between the center line of the shield machine and the design axis is large, and it is difficult to correct the deviation, which is easy to cause damage to the segment, and even needs to adjust the design line.

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