| 摘要 |
A hinge connects the webbing of a first bridge span to the webbing of a second bridge span. The hinge has male hinge plates on opposite sides of the first span's webbing and has female hinge plates on opposite sides of the second span's webbing. A shaft passing through the male hinge plates and first span's webbing is threaded on the ends but is smooth between the ends. Pockets at outer surfaces of the male plates surround the threaded ends and accept torque limiting nuts engaging the shaft. The nuts have heads, recess bodies and frangible necks connecting the heads to the bodies. No part of the bodies extends past the outer surfaces of the male plates. When the nuts are driven onto the shafts at a given torque, the necks break and the heads twist off. Then any remaining parts of the necks are removed. The male hinge plate can then be rotatably mounted adjacently between the female hinge plates.
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