| 摘要 |
A canal bed shell for use in a manhole construction consisting at least partially of tubes and carrying a liquid medium has a U-shaped or a V-shaped cross section. On at least one end of the canal bed shell is a continuation defined by a tube portion which is integrally formed with the canal bed shell and which can be tightly connected with one of the tubes. The height of the canal bed shell as measured from the bottom to the upper boundary edge is at least as great as is the internal diameter of said tubes. The canal bed shell passes over in a stepless manner into said tube at least at the area of the bottom of the canal bed shell. If required, the canal bed shell can be arcuately bent and be provided with side-channel crossings. In a preferred form of the invention a berm is formed integral with the canal bed shell and includes a recessed shoulder which receives a vertical shaft element thereon.
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