Excavating tool for a tunnel boring machine and boring machine comprising such tool

Abstract

A mining tool (4) comprises a scraper bit (20) and a mounting bracket, and the mounting bracket is arranged to attach the cutting head of the tunnel boring machine, and the mounting bracket and the knife bit are engaged with each other. The screw (30) is attached to the mounting bracket, and the screw is screwed into the screw hole (26) of the scraper bit, and the separation direction (D) is transverse to the central axis of the screw hole (Y2). Screw holes and screw drill blade is designed so that the mining tools in the conversion between the installation configuration and disassembly configuration by screwing and unscrewing to keep blade bit and screw fixation to each other, in the disassembly of configuration, the screw does not interfere with the mounting bracket in the separation direction, so that the driver only in the separation of the direction, the drag bit and screw from the mounting bracket and driven by separation, only in the opposite direction of the separation, drag bits and screw is mounted on the mounting bracket.

Description

technical field [0001] The invention relates to an excavating tool for a full-face tunnel boring machine, and a full-face tunnel boring machine comprising such an excavating tool. Background technique [0002] Tunnel boring machines, otherwise known as tunnel boring machines, comprise a tubular casing, at the front of which a shield is arranged, the outer diameter of which corresponds to the diameter of the tunnel being drilled. The front of the shield is in contact with a cutting surface for drilling the ground traversed by the tunnel boring machine, the front of the shield includes a cutting head driven around itself with the tunnel boring machine The central longitudinal axis corresponds to the axis of rotation. Cutting down of the ground is achieved by rotation of the cutting head and simultaneous advancement of the cutting head by a strong thrust against the cutting face. On the rear of the front shield, the casing of the tunnel boring machine is internally equipped w...

AI Technical Summary

Problems solved by technology

In fact, it is necessary to handle the screw and its associated nut approximately simultaneously for mounting and dismounting: in the maintenance environment described above, and by taking into account the different possible Oriented towards the fact that screws often extend in an oblique manner with respect to the horizontal, it is understandable that these handling operations require two operators, in addition to incurring a high risk of losing screws and / or nuts

[0006] Also, for either solution, if necessary, decoupling the drag bit from the mounting bracket after the screw has been released from its nut requires the screw to be completely separated from the drag bit and mounting bracket: yes It is understood that the movements involved in the corresponding manipulations are complex, which in practice prevents these manipulations from being performed by manipulators at reasonable cost

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