Box cover with apertures in load classes A15kN, A50kN, B125kN, C250kN, D400kN, E600kN and F900kN

摘要

Protection claim for shaft frames with openings:a box cover in classes A15kN, A50kN, B125kN, C250kN and D400kN of plastics, cast iron, steel or mixtures with horizontal, vertical and vertical and horizontal openings to significantly reduce the weight with or without wrapping the openings by geotextiles and/or films of any kind.