STRESS AND DEFORMATION ADJUSTABLE INNER ANCHOR HEAD OF UNBONDED PRESTRESSED ANCHOR CABLE

摘要

#$%^&*AU2019101438A420200123.pdf#####STRESS AND DEFORMATION ADJUSTABLE INNER ANCHOR HEAD OF UNBONDEDPRESTRESSEDANCHORCABLE ABSTRACT The present invention provides a stress and deformation adjustable inner anchor head of an unbonded prestressed anchor cable, including an anchor head body, deformation components, button heads and a protective cover. The anchor head body is in the shape of a conical frustum, a plurality of combiner-shaped through holes penetrate a front end and a back end of the anchor head body and are opened in a stress direction, the combiner being formed by a cylinder and a conical frustum, and a steel strand forming the prestressed anchor cable and externally sleeved by the deformation component passes through the combiner-shaped through hole. When the structure of the anchor cable generates deformation due to an exterior load, the steel strand forming the prestressed anchor cable can transfer the load to the deformation component formed by the cast iron casing and the low-strength metal casing such that the steel strand generates a certain displacement under the action of the relatively stable load so as to effectively reduce a maximum load generated to the steel strand due to rock mass deformation and to prevent failure of an anchorage system caused by breakage of the steel strand, thereby improving integral reliability of an anchored slope and ensuring safety of engineering construction and operation.1/4 FIG.1 1 FIG. 2A