Double-layer sleeve used on non-friction segment of test pile of draw-resisting bored pile

The utility model discloses a double-layer sleeve used on a non-friction segment of a test pile of a draw-resisting bored pile. The double-layer sleeve comprises an inner layer sleeve, an outer layer sleeve and a plurality of limit steel plates which are used for limiting relative positions of the inner layer sleeve and the outer layer sleeve. The limit steel plates are welded with the inner layer sleeve in an integrated mode, and a ring of base is welded at the bottom of the outer layer sleeve. A gasket is arranged on the base, and the connecting port portions of the inner layer sleeve and the outer layer sleeve are sealed through sealing objects. The double-layer sleeve is simple in structure, and at the pile foundation test time of the test pile, friction force generated in the non-friction segment can be ignored. Actual force bearing station of engineering piles in the future can be objectively imitated, and experimental data which are closest to the realism are provided.