Muck improvement system of shield tunneling machine

Abstract

The invention relates to a muck improvement system of a shield tunneling machine. The shield tunneling machine comprises a cutterhead and a soil bin behind the cutterhead; the muck improvement systemcomprises a soil bin injection port formed in a wall plate of the soil bin, a first cutterhead injection port formed in the center of an opening of the cutterhead, and a first cutterhead injection pipe connected with the first cutterhead injection port, and further comprises a secondary grouting pump; and the secondary grouting pump comprises a liquid pump A and a liquid pump B, the water outlet end of the liquid pump A is connected with the soil bin injection port through a soil bin injection pipe in a shield body, the water outlet end of the liquid pump B is connected with the water inlet ofthe first cutterhead injection pipe, and the soil bin injection pipe is arranged in the shield body. The shield tunneling machine muck improvement system has the following beneficial effects that thesecondary grouting pump is reasonably connected into the shield tunneling machine, and secondary grouting equipment in conventional shield construction is fully utilized; and in the tunneling processof the shield tunneling machine, due to the fact that the pump energy of the secondary grouting pump is large, the scouring capacity of the secondary grouting pump to the center of the wall plate ofthe soil bin and the center opening of the cutterhead is improved, an injection opening is not prone to being blocked, and mud cakes are prevented from appearing in the center of the wall plate of thesoil bin 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 shield machine dreg improvement system. 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 mud cake i...

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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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