The concrete lining of water diversion and flushing pressure tunnel of Changma reservoir adopts the full-section lining steel trolley,which satisfies the integral support mold,the concrete pouring work and slag disposal passage.

In this paper,the necessity for steam condese -water full closed redeem technique is analyzed, the steam condense-wa-ter full closed redeem system based on PLC is developed,and the structure diagram,signal detect method,control logic relation,the keypoint of PLC program project as well as boiler priority supply electrical circuit chart are given.