Fastener for corrugated sheet

A fastener for a corrugated sheet comprising:

• a cylindrical assembly including a plurality of elongated, plate shaped fastening members assembled as a hollow cylinder, with each fastening member tapered to one end to form a hook at the one end and having a curved groove on an outer surface, with a curved trough on the outer surface at another end of each fastening member, with the curved troughs of the plurality of fastening members assembled to form an annular recess;
• a retainer ring secured to the annular recess and having an opening at one end;
• a ring-shaped elastic member secured to the curved grooves of the plurality of fastening members;
• a first sealing member put on a peripheral surface of the retainer ring, wherein the first sealing member is shaped as a ring and implemented as a pad made of thermoplastic;
• a washer;
• a threaded bolt driven through the washer, the retainer ring, and the plurality of fastening members to have an open end proximate to the hooks of the plurality of fastening members;
• and
• an expansion nut having a multi-sided outer surface and moveably secured to the threaded bolt, with the expansion nut surrounded by the hooks of the plurality of fastening members.