Describir: Pre stressed concrete :

  _  _     _____     _____      ___     _____       ___     _    _     _____   
 | \| ||  |  ___||  /  ___||   / _ \\  |  __ \\    / _ \\  | \  / ||  |  ___|| 
 |  ' ||  | ||__   | // __    | / \ || | |  \ ||  | / \ || |  \/  ||  | ||__   
 | .  ||  | ||__   | \\_\ ||  | \_/ || | |__/ ||  | \_/ || | .  . ||  | ||__   
 |_|\_||  |_____||  \____//    \___//  |_____//    \___//  |_|\/|_||  |_____|| 
 `-` -`   `-----`    `---`     `---`    -----`     `---`   `-`  `-`   `-----`