In the planning and design of gravity water transfer system, the combined pattern of pressure free pipe and canal with pressured pipe line is sometimes adopted to carry out water transfer.
在重力输水系统的规划设计中，有时采用无压管渠与压力管道相结合的方式输水。
The implanting device comprises canal head, inner pipe, close end controller, middle pipe, wire pipe, outer protection mechanism, at least one locking wire and at lest one bracket pulling wire.
输放装置包括导管头、内管、 近端控制器、中管、导丝管、外保护机构、至少一根锁定丝和至少一根支架拉 线。
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