definition
strict definition
number of movable leaves
The number of distinct bridge deck sections that move in normal operation, with folding or curling segments grouped.
The number of movable leaves on a movable bridge is the total number of distinct sections of deck which are capable of moving in the course of normal operation. For example, a bascule bridge may have one leaf which spans the whole length, two leaves which meet in the middle and move separately, or four leaves when there are 2 sets of parallel leaves.
In the case of a folding bridge or a curling bridge, the individual segments are not counted separately.
The operating leaf is the unit of the count. Parallel sets can contain separate leaves, while the linked segments of a folding or curling assembly remain parts of that assembly.
Related definitions
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number of balconies
The total quantity of overhanging platforms connected with a structure which extend living space outdoors above the ground level. -
number of bridge tender houses
The number of distinct control points for operating and monitoring a movable bridge, attached to it or nearby. -
number of chimneys
The total quantity of emissions shafts protruding vertically from a structure. -
number of terraces
The total quantity of occupiable outdoor spaces or platforms which rest on setbacks of a structure higher than ground level. -
number of towers
The quantity of distinct towers rising over the main roofline of a structure.