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A pontoon bridge (or ponton bridge), also known as a floating bridge, uses floats or shallow-draft boats to support a continuous deck for pedestrian and vehicle travel. The buoyancy of the supports limits the maximum load that they can carry. Most pontoon bridges are temporary and used in wartime and civil emergencies.
The pontoon bridge had been "taken out," but 26 boats docked on the sandbar were sunk before they could be handled by the bridge crew. [ 66 ] Lightning struck a telephone pole in the middle of the Arkansas River on May 17, 1915, and severely shocked the custodian of the pontoon bridge. [ 67 ]
Pontoon bridges have been constructed over the Zhang and Gong rivers since the Song dynasty (960–1279). One of the bridges, the Dongjin Bridge, can still be seen. It is 400 metres long, made up of wooden planks placed on around 100 wooden boats linked together with iron chains. Guangji Bridge (Chaozhou), China
The bridge's 58 anchors all feature 3-inch-thick (7.6 cm), 1,000-foot-long (300 m) steel cables and are divided into three types: 45 587-short-ton (533 t) fluke anchors used in softer soils deep in the lakebed; eight 107-short-ton (97 t) gravity anchors used in solid soils nearer to the shore; and five 10-foot-diameter (3.0 m), 79-to-92-foot ...
For a small boat (e.g. 22' / 6.7 m sailing yacht), this might consist of a heavy weight on the seabed, a 12 mm or 14 mm rising chain attached to the "anchor", and a bridle made from 20 mm nylon rope, steel cable, or a 16 mm combination steel wire material. The heavy weight (anchor) should be a dense material.
Holding ground is the area of sea floor that holds an anchor, and thus the attached ship or boat. [4] Different types of anchor are designed to hold in different types of holding ground. [5] Some bottom materials hold better than others; for instance, hard sand holds well, shell holds poorly. [6] Holding ground may be fouled with obstacles. [6]
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