Negative ring duct piece dismounting device and dismounting tool thereof

The utility model relates to the technical field of shield negative ring duct piece dismantling construction, and particularly discloses a negative ring duct piece dismantling device and a dismantling tool thereof. The tool comprises a tool body, the tool body comprises a first clamping plate, and a second clamping plate perpendicular to the first clamping plate is arranged at one end of the first clamping plate; an inclined connecting plate is arranged at the other end of the first clamping plate; an arc-shaped rod which penetrates through a threaded hole in the negative ring duct piece and is connected with the second clamping plate and the connecting plate is arranged between the second clamping plate and the connecting plate. The device comprises a crane, and one end of a lifting rope of the crane is provided with the negative ring duct piece dismantling tool. The inverted-V-shaped buckle can solve the problems that the contact area between the inverted-V-shaped buckle and the negative ring segment is sma