Supporting and protecting device for inner wall of plastic sleeve

The utility model discloses a plastic sleeve inner wall supporting and protecting device which comprises a center transmission supporting rod, a transmission mechanism, a vertical supporting piece, an inclined supporting rod, a displacement fixing mechanism and a retraction tray, and the transmission mechanism comprises a transmission gear and a transmission supporting arm. The displacement fixing mechanism is used for providing single stress for the transmission supporting arm, and the retraction tray is used for retraction and recovery of the supporting device. Mechanical gear transmission is utilized, the supporting arms are driven to extend outwards through center rotation, the supporting arms and the inclined supporting rods jointly provide supporting force for the device to replace water injection to balance internal and external pressure, damage to the side wall is prevented, construction efficiency is improved, and water resource consumption is reduced. 本实用新型公开了一种塑料套管内壁支撑保护装置，包括中心传动支撑杆、传动机构、竖向支撑片、斜向支撑