| 摘要 |
An intermediate concrete support layer (22) runs between a conduit (16) and a sole plate (20). A shaft ring (12) beneath the conduit has a constant outer diameter and fits on an all-round stage (24) of the sole plate. The shaft ring on the outside runs precisely to the all-round outer edge (26) of the sole plate. The sole plate is made of stone, concrete or plastic material, particularly of chemical-resistant material. The shaft lower part (10) or the shaft ring (12) at its upper edge is formed as a widened muff (14) to accommodate a connecting ring (28) for a further shaft ring. |
