PROBLEM TO BE SOLVED: To provide a valve device mounting structure, a valve device mounting method, and a valve device de-mounting method, which can mount a gate valve and a valve device in a non-interrupted state while performing non-interrupted construction and can demount the gate valve and the valve device while performing detention for a long term.SOLUTION: In the structure for mounting, in non-interrupted state, a valve device on a pipe body 1 including a pipe line part 8 for causing liquid to flow, a hole part 42 formed in the pipe line part 8, and a neck part 41 communicating with the hole part and having an open end part 43, the neck part 41 has an opening part 44 which can mount a valve device having a valve body that can open/close the neck part, and includes an opening/closing valve 131 which seals the opening part 44 and can also interrupt and open the open end part 43.SELECTED DRAWING: Figure 16
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