PROBLEM TO BE SOLVED: To provide a remote drilling method and a remote drilling device that enables drilling of a closing plate and others of existing penetration, while securing a temporary boundary.SOLUTION: A remote drilling method includes the following steps for: installing a valve spool 3 that may be opened/closed through a short pipe 44 welded on a wall part 26 of a building; installing a remote-operable drilling device body 2 on the valve spool, through a seal part 24; filling nitrogen gas in the short pipe, by supplying nitrogen gas from a purge line 31; configuring a temporary boundary 32 while maintaining the nitrogen gas supply, by opening the valve spool and inserting an extension shaft 4 of a drilling device 1 through the valve spool, the drilling device having a drill 6 fitted at a tip; inserting the extension shaft further to the wall part, while maintaining the nitrogen gas supply; drilling an open hole through the wall part by remote-operating the drilling device, while maintaining the nitrogen gas supply; and pulling out the extension shaft and closing the valve spool, while maintaining the nitrogen gas supply.SELECTED DRAWING: Figure 1
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