| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a paddy field water level control pit that allows a paddy field water level to be easily controlled and accurately set by increments of one millimeter, therefore eases the burden of water depth control, furthermore has a simplified structure, and is thus free from a problem such as a fault and malfunction. <P>SOLUTION: Guide grooves 5 are formed on the inner surfaces 3F of a pair of side wall plates 3 and 3 constituting a pit body 1. A pressure receiving plate support groove 6 with the approximately half-width of the guide groove is formed on the inner surface 2A of a bottom plate 2. The pressure receiving plate 7 having an anchoring stopper on its upper end side is fitted into the pressure receiving plate support groove 6 on its lower end side and into the guide grooves 5 on its both width sides so as to be able to be tilted. A water level control plate 8 having an engagement stopper on its lower end side is inserted, facing the pressure receiving plate 7, to the upper side of the guide groove 5 so as to be liftable. The water level control plate 8 is maintained in a desired water control height by the pressure receiving plate 7 being tilted backward due to a water pressure and/or a soil pressure on a supporting point of the pressure receiving plate support groove 6 to pressure-contact the water level control plate 8, and is prevented by the engagement stopper abutting the anchoring stopper from being spaced from the pressure receiving plate 7. <P>COPYRIGHT: (C)2012,JPO&INPIT |
