Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : January 24, 2020
In elevator industries, there is a demand for technologies for shortening work period. In this paper, we examined the weld-less construction method to couple the rail brackets by drilling screw. The calculation methods of the shear load to the drilling screw were studied. Since the load on the drilling screw varies depending on the bracket designs for each model, it is necessary to calculate for each models so that the load does not exceed the allowable shear strength. In addition, the static shear and fatigue tests of drilling screw were carried out. The actual shear strength of drilling screw is approximately twice the permissible shear strength. If the load to drilling screws are less than the permissible shear strength, it will not be broken by an earthquake load. Even if a load equivalent to the long-term permissible shear strength is repeatedly applied, the drilling screw will not be fatigued or loosened.
