Shield tunneling machine muck improvement method

Abstract

The invention relates to a shield tunneling machine muck improvement method. The method comprises the steps that shield tunneling machine operation parameters in the tunneling process of a shield tunneling machine are detected in real time; whether the shield tunneling machine operation parameters are within a preset threshold range or not is judged; when the shield tunneling machine operation parameters are not within the preset threshold range, the situation that a liquid pump A in a secondary grouting pump in the shield tunneling machine injects water into two or more soil bin injection ports is adjusted to the situation that the liquid pump A injects water into one soil bin injection port; and a liquid pump B in the secondary grouting pump continuously injects water into two first cutterhead injection ports in the center of a cutterhead opening. The secondary grouting pump is reasonably connected into the shield tunneling machine, and secondary grouting equipment in conventional shield tunneling construction is fully utilized. Due to the fact that the pump energy of the secondary grouting pump is large, the secondary grouting pump is adopted to inject water into an emergency standby injection port in the center of a soil bin wall plate and the injection port of the cutterhead opening, the scouring capacity to the center of the soil bin wall plate and the center opening of the cutterhead is improved, the injection ports are not prone to being blocked, and mud cakes are prevented from appearing in the center of the soil bin wall plate and the center of the cutterhead.

Description

technical field [0001] The invention relates to the technical field of shield machine construction, in particular to a method for improving dregs of a shield machine. Background technique [0002] Conventional dregs improvement methods are often used in the design and use of shield machines at home and abroad. The dregs improvement system is designed by using shield machines, and the cutter head or soil bin is improved by using foam, mud, water and other modifiers, which can basically be improved. Satisfy the muck improvement of the shield machine under weak and single geological conditions. However, in complex formations such as mudstone, argillaceous siltstone, viscous dehydration, and uneven hardness and softness, due to the influence of geology and hydrology, the rock blocks become debris and powder under the cutting of the tool and the impact of the cutterhead. The improvement effect of the muck at the center opening of the cutter head is poor, and the phenomenon of mu...

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Problems solved by technology

However, in complex formations such as mudstone, argillaceous siltstone, viscous dehydration, and uneven hardness and softness, due to the influence of geology and hydrology, the rock blocks become debris and powder under the cutting of the tool and the impact of the cutterhead. The improvement effect of the muck at the center opening of the cutter head is poor, and the phenomenon of mud cake is easy to occur under the extrusion condition of the cutter head rotation and high temperature

At the same time, according to the construction test results of the existing shield machine, when the blocking pressure at the injection port is greater than the pressure injection resistance, the pipeline is basically in a blocked state, and the pressure injection of the modifier cannot be performed, resulting in the muck being unable to be effectively improved , it is easy to cause blockage in the soil silo and produce mud cake, etc.

However, it is difficult to completely prevent the mud cake at the center of the cutter head by using the conventional muck improvement system. When the mud cake is formed at the center of the cutter head, it is extremely difficult to handle, and the mud cake formed in the center will speed up the rapid recovery of the mud cake in the soil bin and the cutter head. formation, seriously affecting the normal construction of the shield machine

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