The chemical erosion mechanism of slide board in casting of Ca-treated steel is analyzed, the research situation at home and abroad about it introduced.

It is a multi-purpose swimming pool facility that includes a 25m, 6-lane pool, leisure pool, tot pool, hot tub, slide, tarzan-rope, and diving board.

The dragging and slipping technique for loading large structure with discontinuous and dissymmetrical slide shoes on board is presented in detail.