Replaceable drainage pipe and karst tunnel

The utility model discloses a replaceable drain pipe and karst tunnel, replaceable drain pipe includes inner pipe, outer pipe, ball seat, ball and flange, the ball seat is provided in the inner wall of outer pipe, the ball is rotatablely provided on the ball seat, the inner pipe is slideably provided in the outer pipe through the ball, and the flange is provided in the outer pipe through the ball. The flange plate is detachably arranged at one end of the outer pipe to block the inner pipe, and a drainage hole communicated with the inner pipe is formed in the flange plate; the karst tunnel comprises a replaceable drainage pipe. The annular drainage pipe and the clear water ditch are connected through the slidable inner pipe, the inner pipe can be conveniently replaced by detaching the flange plate, and blockage caused by crystallization of the inner pipe is avoided. 本实用新型公开了一种可更换排水管及岩溶隧道，可更换排水管包括内管、外管、滚珠座、滚珠和法兰盘，所述滚珠座设置在所述外管的内壁，所述滚珠可转动地设置在所述滚珠座上，所述内管通过所述滚珠可滑动地设置在所述外管内，所述法兰盘可拆卸地设置在所述外管一端以阻挡所述内管，所述法兰盘上设置连通所述内管的排