| 摘要 |
<p>A reliable multi-shaft excavating device for forming a linear continuous wall unit comprises three mixing shafts (5A, 5B, 5C) for use in forming in the ground a continuous wall, and a housing (11) for maintaining intervals between said mixing shafts (5A, 5B, 5C) provided therein with first transfer means (14) rotated by the middle mixing shaft (5B), second transfer means (15) in engagement with said first transfer means (14), third transfer means (18) that is integral with said first transfer means (14), fourth transfer means (21) in mesh engagement with said third transfer means (18) and secured to a rotating shaft (19) perpendicular to a straight line connecting the centers of said mixing shafts, and sideward expanded cone-shape cutters (22) securely provided on the ends of said rotating shaft (19). According to the present invention, all the triangular projecting portions that have been left uncut are cut by cutters, and it is possible to form in the ground a continuous wall unit having semi-circular ends and linear sides. Here, since the above mentioned cutters are in a cone shape such as a frustoconical shape, even if the distances between the mixing shafts are long, most of the triangular projecting portions (portions that have not been excavated) can be excavated, and portions left uncut disintegrate naturally by their self weights, vibrations, and others. In other words, according to the present invention, it is possible to make longer portions between the mixing shafts. In addition, it is possible to reduce time and labor to be spent for forming a continuous wall unit by making longer portions between the mixing shafts.</p> |
