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The deck is connected to the arch by 12 pairs of vertical hangers at the arches and the deck intersection point, 60 m from the centre of the bridge, rigidly joined by a cross brace. Each arch is embedded at the ends in a reinforced concrete block (the smallest being 6 m long, 7 m high and 5 m wide) connected by means of a joint of 28 steel bars ...
An unreinforced concrete arch is technically a masonry arch that use only very small stones, that is the aggregate of the concrete, sand and gravel. Such an arch would not stand without mortar. Some modern bridges are built masonry style with precast concrete blocks, like Gladesville Bridge that has a span of 305 metres (1000 ft). These types ...
If the spandrel is solid, usually the case in a masonry or stone arch bridge, the bridge is called a closed-spandrel deck arch bridge. If the deck is supported by a number of vertical columns rising from the arch, the bridge is known as an open-spandrel deck arch bridge. The Alexander Hamilton Bridge is an example of an open-spandrel arch ...
The bridge has a main span of 37 metres, and a total length of 55.6m. [2] The arch is polygonal rather than curved, and is only 200 mm thick. [3] It supports the bridge deck via 160 mm thick reinforced concrete cross walls. The deck is thicker than the arch, and is stiff enough to prevent the slender arch from buckling. The highway deck is ...
The bridge deck is supported by a third structural element hanging underneath. They are named for the German engineer Hermann Lohse (1815–1893) who developed them in the late 19th century. The correct name of tied arch bridges with inclined hangers that cross each other at most once is Nielsen bridge.
The single arch of the bridge has a span of 31.4 meters and a rise of 11.42 meters, which was unusually flat for the time. The structure features two different masonry techniques: the lower part is made of gneiss blocks, dry-laid, while the upper part is a superposition of layers made of gneiss flakes and lime, interspersed with bands of stone. [9]
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The first section of the launch, the launching nose, is not made of concrete, but is a stiffened steel plate girder and is around 60% of the length of a bridge span, and reduces the cantilever moment. [3] The sections of bridge deck slide over sliding bearings, which are concrete blocks covered with stainless steel and reinforced elastomeric pads.