Center cutter box repair technique of shield in upper-soft lower-hard ground under normal pressure

Abstract

The invention discloses a center cutter box repair technique of a shield in an upper-soft lower-hard ground under normal pressure, and solves the problem that a shield tunneling machine in the upper-soft lower-hard ground replaces the center cutter box under the normal pressure. The technique includes steps of replacing waste soil in the vicinity of a soil cabin and a cutter disk by bentonite slurry firstly under the pressure of the soil cabin of the shield tunneling machine; forming a layer of slurry protecting wall on the excavated hole wall; replacing bentonite slurry by mortar under the condition of pressure so that the mortar is condensed in the excavated hole and the soil cabin; forming a support to the upper-soft lower-hard ground to make it free from collapse; finally, removing the condensed mortar in the vicinity of the soil cabin and the cutter disk manually, and realizing the operation of changing cutters in the soil cabin under the normal pressure. The technique solves the difficulty of changing cutters and avoids the collapse of soil body at the upper part of the cutter disk; the technique is simple to operate on site, easy to practice, and small in investment.

Description

Technical field [0001] The invention relates to a process for repairing the center knife box of the cutter head of a shield machine, in particular to a process for repairing the center knife box on the cutter head of a shield machine by a shield under the conditions of upper soft and lower hard geological conditions. Background technique [0002] The upper soft and lower hard strata are composed of two or more different geological layers, and the characteristics of rock and soil mechanics, engineering geology and hydrogeology of each layer are quite different. The shield machine is in the shield tunnel, in the shield excavation section and the direction of the excavation extension, when it encounters the upper soft and the lower hard ground, the upper part of the shield machine cutter disk excavation surface is filled with silt and silt. When the lower part of the excavation face of the cutterhead is moderately weathered sandstone, the shield machine must work in the earth pressu...

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Problems solved by technology

[0003] The invention provides a process for repairing the central cutter box of a shield machine under normal pressure in upper soft and lower hard strata, and solves the technical problem of the shield machine replacing the central cutter box under normal pressure under the upper soft and lower hard geological conditions

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