| 摘要 |
PURPOSE: An access hole forming method for working inside a ship is provided to block an internal work space of a ship from the outside by closing the access hole if necessary because a plate piece cut from a plate by a boring work is mounted on the access hole to be used as a door. CONSTITUTION: An access hole forming method for working inside a ship is as follows. A mark indicating the delay of welding is marked in the connection part of a plate(15). When the plate is welded, it is limited that the marked part is not welded. The plate is contained at an expected position where an access hole is positioned. The access hole is bored at the expected position by a cutting unit. An unwelded marking part is the edge of the access hole. A cut plate piece(23) is separated from the plate to obtain the access hole. |
