Auxiliary device for axial tensile test of concrete core sample

An auxiliary device for an axial tensile test of a concrete core sample particularly relates to the technical field of construction engineering concrete quality detection, and comprises a bonding plate, a pulling plate, a screw rod and a ball head pull rod, a circular groove slightly larger than the diameter of a concrete core sample is formed in one side of the bonding plate, screw holes are formed in the other side of the bonding plate, and the positions of the screw holes correspond to those of the circular holes in the pulling plate one to one; the bonding plate and the pulling plate can be fixedly connected by screwing the screws into the screw holes; a center hole and a spherical clamping groove are formed in the center of the pull plate, the ball head pull rod is cylindrical, one end of the ball head pull rod is machined into a sphere with the diameter larger than that of the ball head pull rod, the diameter of the ball head pull rod is smaller than the inner diameter of the center hole, and an angle g