Shield launching flexible connecting steel sleeve mechanism and construction method thereof

Abstract

The invention relates to the technical field of underground tunnel excavation and construction, and in particular to a shield launching flexible connection steel sleeve mechanism and a construction method thereof. The shield launching flexible connection steel sleeve mechanism includes a steel sleeve body for sleeving a shield machine, an annular transition steel ring, a negative ring tube piece,a special tube piece, a reinforced ring beam, and a reaction frame; the steel sleeve body is composed of a first steel sleeve unit, a second steel sleeve unit, and a third steel sleeve unit that are sequentially connected along the axial direction of the steel sleeve body, and the outer wall of the second steel sleeve unit is provided with a grouting nozzle; the steel sleeve body is formed by butting and combining an upper steel cylinder and a lower steel cylinder along the circumference of the steel sleeve body; and the special tube piece has a ring structure, and a flexible connection mechanism is arranged between the outer wall of the special tube piece and the inner wall of the tail end of the third steel sleeve unit. The invention solves the major defects in the force system of a shield launching system, and overcomes the phenomenon of tension cracks and the problem of pressure holding failures caused by the reaction among various joints of the steel sleeve and between the annulartransition steel ring and the underground continuous wall.

Description

technical field [0001] The invention relates to the technical field of excavation and construction of underground tunnels, in particular to a flexible connection steel sleeve mechanism for starting a shield tunnel and a construction method thereof. Background technique [0002] my country's urban subway construction is developing rapidly, and most of the construction methods for the tunnel section between the two stations use the shield method. However, when the shield machine is excavating and excavating, it is easy to produce sudden surges and quicksand at the entrance of the tunnel, especially in weak strata and water-rich strata, it is easy to cause stratum subsidence and shield machine to be buried. The main technical difficulties in shield construction. When the surrounding environmental conditions are relatively good and allowed, the soil around the starting portal is usually reinforced by rotary spraying from the surface, and then steel rings are laid at the portal,...

AI Technical Summary

Problems solved by technology

It solves the major flaws in the force system of the shield launching system, the failure and damage of the steel sleeve under the reaction force

Images