A mud-water balanced horseshoe shield machine

Abstract

The invention provides a slurry-water balanced horseshoe-shaped shield machine for tunnel construction. The slurry-water balanced horseshoe-shaped shield machine comprises a shield shell, a cutter head set in front of the shell, a slurry circulating system behind cutter heads, shield jacks arranged around the shield shell, a movable double-head segment erector and other auxiliary devices. The operating principle of the slurry-water balanced horseshoe-shaped shield machine is that the cutter head set composed of round cutter heads and specially-shaped cutter heads is used for cutting to form a horseshoe-shaped tunnel; pressure slurry is used for keeping the stability of an excavated surface; a shield tail is provided with three steel wire shield tail brushes, the spaces between the three steel wire shield tail brushes are filled with grease to be sealed, and the last steel wire shield tail brush can be replaced; the tail end of the shield shell is provided with a steel slurry stopping plate inclined in the shield tail direction and used for preventing the slurry from leaking; cut soil bodies are sent to the ground through a slurry outlet pipe, and meanwhile fresh slurry is supplemented through a slurry inlet pipe so as to keep the slurry-water pressure; the movable double-head segment erector is used for assembling arc-shaped segments and non-arc-shaped segments.

Description

technical field [0001] The invention relates to a tunnel digging machine, in particular to a mud-water balanced horseshoe-shaped shield machine for building underground structures. Background technique [0002] At present, the shield method has become one of the main methods of urban tunnel excavation. This construction method has little disturbance to the ground and less damage to the environment. Most of the existing shield machines have a circular cross-section, which has the advantage of a better structure, especially in weak strata, and the circular tunnel can make the segments in a relatively reasonable stress state. However, the problem with circular tunnels is that their space utilization is low, and not all geological conditions require the construction of circular tunnels. In strata with low lateral pressure coefficients, the structural advantages of circular tunnels cannot be fully utilized. The space utilization efficiency of rectangular tunnels is higher than t...

AI Technical Summary

Problems solved by technology

Horseshoe-shaped tunnels are generally excavated by mining method or new Austrian method. The disadvantages are that the disturbance to the stratum and the impact on the environment are relatively large, and it is difficult to control, and it cannot meet the increasingly stringent environmental protection requirements in the city. This greatly limits The scope of application of the horseshoe-shaped tunnel

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