Filtering device used when slurry balance type jacking pipe passes through pebble bed

The utility model discloses a filtering device used when a slurry balance type jacking pipe passes through a pebble bed, belongs to the technical field of engineering construction, and aims to solve the problem that under the geological condition of more pebbles, a mud outlet pipe is easy to block in the construction process of the slurry balance type jacking pipe, so that a mud pump cannot finish mud outlet work. An opening is formed in the top end of the sedimentation tank, a sludge outlet is formed in one side of the sedimentation tank, a sludge outlet door is arranged at the sludge outlet end, a drainage hole is formed in the other side of the sedimentation tank, a filter screen is arranged at the opening in the top end of the sedimentation tank, and the aperture of the filter screen is smaller than the particle size of the pebbles. By means of the device, a pebble bed can be effectively penetrated, it is guaranteed that the mud outlet pipe is not blocked by filtering pebbles, and therefore tight connecti