| 摘要 |
PURPOSE:To enable a base semi-shielding machine to be used as the semi- shielding machine of the different outer diameter of a desired sort, and facilitate the recovering and re-using of the machine, by fitting the attachments of a plurality of sorts to be freely assembled or overhauled, on the base semi- shielding machine. CONSTITUTION:A semi-shielding machine provided with one set of driving gears is set as a base semi-shielding machine A. Besides, the attachments 16 of one short or a plurality of sorts of different outer diameter dimensions are prepared, and according to the requirement, the one short is selected, and is fitted to be freely assembled or overhauled, on the base semi-shielding machine A, and the machine A is used as a semi-shielding machine B. After the use of the machine is completed, the attachments 16 are removed from and are overhauled, and the base semi-shielding machine A and the attachments 16 are separately collected outside slots from a carry-over vertical shaft, the nearest manhole, a starting manhole, and the like. |
