| 摘要 |
A guide (36) extending in the transverse direction of the gallery is installed on the floor frame (21) of the support strut (22). The guide is supported on the gallery level (8) and is provided for at least one boring tool (37) which bores holes (33) in the roof, serving as the roof anchoring. The guide, preferably by means of a hydraulic jack (40), is vertically adjustable, and located behind the support struts of which there are at least three. |
