Column-plate-shaped observation window structure special for submersible and installation method of column-plate-shaped observation window structure

The special column-plate-shaped observation window structure comprises a window seat, an opening is formed in the top face of the window seat, a window seat cylindrical groove is formed in the opening, a window seat fillet is arranged at the bottom of the window seat cylindrical groove, a window seat light-transmitting hole is formed in the bottom of the window seat, and a plurality of threaded blind holes are formed in the top face of the window seat; a gland is mounted on the top surface of the window seat through a fastener; a plurality of counter bores and through holes corresponding to the threaded blind holes are formed in the gland; a lower rubber pad is installed at the bottom in the window base cylindrical groove, an upper rubber pad is installed at the position, matched with the gland, of a groove opening of the window base cylindrical groove, window glass is installed between the upper rubber pad and the lower rubber pad, and all corners of the window glass are installed in a sealed mode through O-