Sand pebble pipe jacking machine and pipe jacking construction method

The invention discloses a sand pebble pipe jacking machine, which comprises a tool pipe, a relay room and a work pipe. The front end of the tool pipe is provided with a ring cutter. An angle between the ring cutter and a horizontal plane is [alpha] less than the natural angle of repose of a sand pebble. The relay room is provided with front jacks. The maximum jacking length of each front jack is Hmeters. The bottom of a front pressure-bearing ring is upwards connected with a baffle. The baffle upwards supports a shaftless screw conveyor. The shaftless screw conveyor in the work pipe is downwards connected with a front stopping plate and a rear stopping plate. The work pipe is provided therein with an electric bucket truck. The tunneling section area of the tool pipe is S square meters. The volume of the electric bucket truck is V cubic meters. The distance between the front stopping plate and the rear stopping plates is L meters, wherein L=V/S and H is an integral multiple of L. The present invention also dis