| 摘要 |
<p>The invention relates to a shaft lower part (1) for a shaft system of a system for receiving, conducting, and storing a fluid, comprising a sealing, pluggable, and/or latchable connection to a shaft central part and/or shaft upper part, comprising a first outer wall (3.4) with reinforcement elements (12) on which lateral flanks (12a) are formed, and comprising a second outer wall (3.5) with reinforcement elements (12'). The shaft lower part comprises a first portion (4) and a second portion (5), wherein the first portion (4) forms the upper portion when seen in the installed position, and the second portion (5) forms the lower portion, said first and second portion being connected to each other in an integral manner by means of a transition portion (6). The shaft lower part also comprises a support surface (7) for placing on a base (8), said support surface having the shape of a circular or annular circular surface or approximately the shape of a circular or circular ring surface. The shaft lower part is characterized in that the second portion (5) has a smaller cross-sectional area F5 with respect to the outer wall (3.5) than the cross-sectional area F4 of the first portion (4) with respect to the outer wall (3.4). The cross-sectional area is the area which is obtained when the portion (4, 5) of the shaft lower part (1) in the installed position is projected vertically onto a horizontal plane E that lies below the portion. An inner circular ring surface (13) is formed in the shaft lower part (1) approximately at the level of the transition portion (6) along the entire inner circumference (1a), and reinforcement elements (9) are formed on the transition portion (6).</p> |
