Method for repairing screw hole of normal-pressure cutterhead and cutterhead cylinder of slurry balance shield tunneling machine

Abstract

The invention discloses a method for repairing a screw hole of a normal-pressure cutterhead and a cutterhead cylinder of a slurry balance shield machine. The method comprises the following steps: 1, cleaning and fixing a cutter cylinder to be repaired; 2, mounting a positioning tool; 3, drilling and dismounting the positioning tool; 4, repairing the screw hole to be repaired; and 5, plugging the repaired screw hole. The to-be-repaired cutterhead cylinder is reversely fixed on the drilling machine, the to-be-repaired screw hole is repaired from the reverse side of the fixed end of the cutterhead holder, the repair process is simple, the possibility of re-damage repair and even cutterhead cylinder scrapping caused by an old repair process is avoided, and a large amount of time cost and capital cost can be saved; and meanwhile, the positioning tool is used for determining the position of the screw hole from the reverse side of the fixed end of the tool apron, so that the repairability of the cutterhead cylinder is improved on the premise that the cutterhead cylinder to be repaired is not damaged, the reliability of the cutterhead cylinder is further improved, the service life of the cutterhead cylinder is further prolonged, and the later construction risk is reduced.

Description

technical field [0001] The invention belongs to the technical field of shield machine maintenance, and in particular relates to a method for repairing the screw holes of the normal-pressure cutter head and barrel of the mud-water balance shield machine. Background technique [0002] The excavation of the shield machine in complex geology not only requires a high level of operation of the construction unit, but also a greater test of the durability of the shield machine. The cutter head of the shield machine undertakes the main work of tunnel excavation and bears huge vibration and pressure. These vibrations and pressures are transmitted to the connecting bolts of the cutter holder in the normal pressure cutter cylinder. During the excavation process, the wear and abnormal damage of the cutter is inevitable. Due to the vibration and pressure, some bolts of the fixing bolts of the cutter holder will loosen and fall off and the wires will be broken. Damage the inner thread of ...

AI Technical Summary

Problems solved by technology

These vibrations and pressures are transmitted to the connecting bolts of the cutter holder in the normal pressure cutter cylinder. During the excavation process, the wear and abnormal damage of the cutter is inevitable. Due to the vibration and pressure, some bolts of the fixing bolts of the cutter holder will loosen and fall off and the wires will be broken. Damage to the thread in the bolt hole of the knife barrel, causing the knife barrel to be unusable

[0003] At present, the commonly used repair methods are: one is to re-tapping the damaged thread in the bolt hole. The bolt hole treated by this method will basically have broken wires and bolts that cannot be removed again during use; the other One is to process and install the wire sleeve by reaming and tapping the bolt hole. The disadvantage of this method is that the thickness of the wire sleeve is thicker, the diameter of the bolt hole reaming is larger, and the wall thickness of the bolt hole in some areas is thin and cannot be repaired by this method, and the wire The threading is damaged during use and it is difficult to repair again

It can be seen that the traditional maintenance method needs to be repaired from the inside. If the drill pipe is repaired from the inside, it needs to be more than one meter long, and the hole will be damaged after repairing. Low

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