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Step street at West 229th Street, Bronx, New York. A step street is a thoroughfare fitted with steps for pedestrian traffic rather than paved or tracked for motor vehicles. . It is a practical way of providing access up and down a slope that is too steep for automobi
The balustrade is composed of handrails, balustrade panels, and skirt panels. [28] The handrail provides a handhold for passengers while they are riding the escalator. The handrail is pulled along its own track by a chain that is connected to the main drive gear by a series of pulleys, keeping it at the same speed as the steps.
Control joints, or contraction joints, are sometimes confused with expansion joints, but have a different purpose and function. Concrete and asphalt have relatively weak tensile strength, and typically form random cracks as they age, shrink, and are exposed to environmental stresses (including stresses of thermal expansion and contraction).
Handrails are necessary because these bridges are prone to oscillate side to side and end to end. Rarely, the footrope (or footrope plus handrails) is combined with an overhead rope similar to a zip-line or cableway. In some cases, such as the Capilano Suspension Bridge, the primary supports form the handrails with the deck suspended below them ...
Helical stairs typically have a handrail along the outer periphery only, and on the inner side may have just a central pole. A "squared helical" stair fills a square stairwell and expands the steps and railing to a square, resulting in unequal steps (wider and longer where they extend into a corner of the square).
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