Concrete anti-permeability instrument

The utility model provides a concrete impermeability instrument, including the impermeability instrument body and a plurality of core sample clamps, the top of impermeability instrument body is provided with a work bench, the core sample clamp comprises a base plate, an elastic sealing sleeve and a plurality of glands, the elastic sealing sleeve is placed on the surface of the base plate, the plurality of glands surround the elastic sealing sleeve, the surface of the gland is provided with a spacing hole, and the core sample clamp is arranged on the base plate. The gland and the workbench are fixedly connected together through bolts, and the bolts sequentially penetrate through the limiting holes and the bottom plate from top to bottom. According to the technical scheme of the utility model, the gland and the workbench are fixedly connected together by using the bolt, and the gland generates extrusion force on the elastic sealing sleeve along the radial direction and the axial direction by tightening the bolt