| 摘要 |
PROBLEM TO BE SOLVED: To reduce maintenance work, secure operator's safety and decreased wind pressure by covering door body supporting towers and a door body operating bridge installed at the top of each tower with a curved sheathing material. SOLUTION: A door body supporting tower 2 and a door body operating bridge 3 are covered with a curved sheathing materials 4, 5 and an operator operates a door opening machine 3a for door body P3 inside the sheathing material 5. In this case, the supporting towers 2 and operation bridge 3 themselves must be protected for safety from storms even during seasons when the weather is severe and the door is operated very often. And a part of sheathing material 5 covering the door body operating bridge 3 is made openable for natural lighting, ventilation for giving a comfortable environment to the operator. Moreover, sealing members are provided for the opening and closing portion of the sheathing material 5 for preventing the leakage of rain water from the opening and closing portion and for suppressing the obsolescence of the supporting tower 2 and the operation bridge 3. In this way, the operating life can be prolonged and the maintenance work can be reduced thereby reducing the influence of wind pressure directly upon these structure by means of the sheathings 4, 5 which finished to curved surfaces.
|
