A shield segment

Abstract

The invention relates to the field of shield construction, in particular to a shield segment, which includes a top piece, a bottom piece and a middle oil cylinder, the top piece and the bottom piece are connected by at least two rows of middle oil cylinders, the front oil chamber and the rear oil chamber of the middle oil cylinder They are connected through an oil circuit, and a pressure control valve is set on the oil circuit. After the shield segment is assembled into the tunnel, as the surrounding rock deforms, the top piece moves and squeezes the middle oil cylinder, and the oil pressure in the middle oil cylinder gradually increases. When the oil pressure increases to the pressure set by the pressure control valve After the pressure is set, the pressure control valve opens, and the hydraulic oil in the rear oil chamber of the middle cylinder flows into the front oil chamber, that is, no matter how the surrounding rock converges and deforms, the top piece will move with the surrounding rock, but the force on the middle cylinder and the bottom piece will always remain unchanged. In addition, the force on the middle oil cylinder and the bottom plate never exceeds the set value of the pressure control valve. Therefore, the shield segment provided by the present invention can be made thinner under the premise of satisfying the strength and rigidity, thus saving raw materials and saving energy. Reduce the transport volume of shield segments.

Description

technical field [0001] The invention relates to the field of shield tunneling, more specifically, to a shield segment. Background technique [0002] At present, tunnel construction methods include open-excavation method and underground excavation method. Among them, the shield method (Shield Method) in the underground excavation method is a fully mechanized construction method. Because the shield method has excavation safety and does not affect the ground. And other advantages, are widely used in tunnel construction, such as: railway tunnels, highway tunnels, underwater tunnels, underground railways, etc. The following is a brief introduction to the structure of the shield machine and the process of shield construction: [0003] The shield machine includes the main machine and three supporting frames. The front end of the main machine is the cutter head, on which different tools are installed. The motor drives the rotation of the cutter head, and several sets of hydraulic ja...

AI Technical Summary

Problems solved by technology

[0004] It can be seen from the above that the shield segment is the main assembly component in shield construction, and is the outermost barrier of the tunnel. The bearer resists soil pressure, groundwater pressure and some special and existing functions. creep, groundwater changes, construction disturbances, and some uncertain special factors will have deformation effects on the strata, and the factors such as the length of the tunnel and the circumference of the tunnel cannot be completely determined. Therefore, the surrounding rock acts on the same shield The surrounding rock pressure at different positions of the shield segment is often different, and the surrounding rock pressure on the shield segment at different positions is often different, and the surrounding rock pressure will change uncertainly in different periods. Therefore, in order to ensure The shield segment can meet the needs of different positions and has the ability to resist changes in surrounding rock. Those skilled in the art often make the shield segment very thick, and the amount of steel and concrete is large, which is a waste of time. Raw materials, and also makes the transportation volume of shield segments larger

Images