| 摘要 |
<p>A microtunnelling apparatus and system that includes an external drive system having rotational and linear thrust drive means, a drill head section (20) having drill rotor (21) and drill rod (22) and connecting to intermediate drill rods (41) allowing extension of the boring hole created by the drill head section driven by the drive system. The drill head (20) includes a modular construction having a plurality of circular disc like elements, a bearing module M1, a steering module M2, a spacer module M3, and a mounting module M4, for axial alignment and abutment and mounting within a cylindrical steering shell M6. Directional steering of the drill head (20) includes a plurality of substantially radially extending channels in steering module M2, each with an hydraulically movable protuberance movable by control means to redirect the outer steering casing M6 and thereby redirect the drill head section mounted on the distal end of the drill rods.</p> |
