| 1 | The reliabilities of some kinds of aqueduct systems are analyzed. | |
| 2 | The invention relates to a kind of aqueduct and process of production. | |
| 3 | The utility model solves the problem that the traditional rocker arm type water conveying pipe can not be bent. | |
| 4 | The utility model belongs to the field of the cast-in-situ engineering of a delivery pipe with large caliber. | |
| 5 | Those pipe are widely used in sewer, electricity and tele-communication cables, drainage for airport and railway projects irrigation pipes, etc. |