Bury steel casing pipe

The utility model discloses a bury steel casing pipe, include: be responsible for the body, it is hollow cylindric structure, be responsible for interior body and outer body that the body includes coaxial setting from inside to outside, the internal diameter of outer body with the poor 0.5 -1cm that is of external diameter of interior body, it has a plurality of inertia alumina ceramic ball to pack between interior body and the outer body, the armor structure includes: the steel band layer, its set up in the outer wall and the edge of outer body the length direction of outer body is the heliciform and extends, the pitch of spiral is 3 -5mm, and a plurality of waterproof rubber circle is followed the length direction of outer body locates with certain spacer sleeve the outer wall of firm lacing. The utility model provides a have wear -resistant steel casing pipe, prolong its life, set up the flame retardant coating simultaneously, appear the short circuit when preventing to use and arouse the conflagration.