| 摘要 |
For energy-saving purposes, it is desirable to provide residences which have uneconomical heating with a heating system with water-borne heating. When installing water-borne heating, it is necessary to lay pipes through walls 3 and floors 4. Since the installation should take place in nonvacated rooms, it is important to produce the boreholes for the required piping with as little bulky equipment as possible and also with as little debris and damage as possible. This aim is achieved by the present invention in that, when making a hole in a floor 4, the drilling is done from the bottom up and the drill 19, 20 during the drilling is surrounded by a housing 31 which, together with the drill 19, 20, forms a tubular space 32 which is connected to an evacuating arrangement 35. <IMAGE> |
