Open shield machine

Abstract

The invention discloses an open type shield machine which comprises a shield body, wherein support grids connected with the upper wall surface of the shield body are arranged at the front end of the shield body and comprise at least one layer of grids which are formed by connecting a plurality of partition plates and axially extend along the shield body. According to the shield machine, a soil body at the upper part of an excavation surface can be supported through the support grids arranged at the front end; when the shield machine moves forwards, muck in the support grids can be pushed out by the soil body on the front side to automatically fall from the rear sides of the support grids, so that the muck in the support grids does not need to be specially removed; due to the arrangement of the support grids, the stability of the excavation surface can be effectively kept, the excavation trouble due to flooding of a large amount of soil bodies on the excavation surface into the shield machine is prevented, the excavation construction efficiency is guaranteed not to be influenced, the risk of soil body collapse is effectively lowered, and the construction safety of the shield machine is improved.

Description

technical field [0001] The invention relates to the field of engineering machinery, in particular to an open shield machine. Background technique [0002] The shield machine is a kind of engineering machinery for tunneling, which is widely used in the construction of subways, railways and roads. Shield machines mainly include earth pressure balance shield machines, slurry balance shield machines and open shield machines. In the construction of the shield method, it is necessary to select a suitable shield machine according to factors such as geological conditions and cost. [0003] When the earth pressure balance shield machine and the slurry balance shield machine are used for tunnel excavation, they can take advantage of their closed structure to resist the earth pressure and water pressure at the excavation surface, maintain the pressure balance of the excavation surface, and In this state, soil excavation, soil muck removal, complete machine propulsion, segment install...

AI Technical Summary

Problems solved by technology

Even so, it is inevitable that the open shield machine will encounter geological conditions with poor self-stability during excavation construction. If the muck enters the shield body, the propulsion resistance will be greatly increased, and the excavation volume will be too large, which will affect the construction efficiency. In severe cases, it will cause ground subsidence or tunnel collapse, resulting in construction safety accidents.

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