PURPOSE: To obtain a profiled sheet applicable to different uses depending on the profile to be connected by providing the sheet with ridges of zigzag corrugation, providing a trough with a plurality of matching properties and holes, matching a corrugated sheet with a corresponding sheet through a filter and the holes thereby connection a large number sheets through the holes.

CONSTITUTION: Each sheet is formed to provide a series of zig-zag 5 and has a top 6 and a trough 7 extending substantially in parallel. The wall or side face of zig-zag 5 is extended vertically to the longitudinal axis of corrugation and provided with a plurality of regular grooves 9 extending from the top 6 to the trough 7 of corrugation. The corrugation extends in parallel with one edge of the sheet and changes the direction at a joint 10 of same profile as the corrugation. The sheet is also provided, at a specified position on the top, with a plurality of holes 12 and a tiller 13 provided in the trough of zig-zag 5 and held integrally by an elongated fixing device 22 extending through the hole 12.