Eiffel Tower
Foundation work of Eiffel Tower started in January 1887. Those for the east and south legs were straightforward, each leg resting on four 2 m (6.6 ft) concrete slabs, one for each of the principal girders of each leg but the other two, being closer to the river Seine, were more complicated: each slab needed two piles installed by using compressed-air caissons 15 m (49 ft) long and 6 m (20 ft) in diameter driven to a depth of 22 m (72 ft) to support the concrete slabs, which were 6 m (20 ft) thick. Each of these slabs supported a block built of limestone each with an inclined top to bear a supporting shoe for the ironwork. Each shoe was anchored into the stonework by a pair of bolts 10 cm (4 in) in diameter and 7.5 m (25 ft) long. The foundations were complete by 30 June and the erection of the ironwork began.
This is very visible on the site was supposed to work that demands a large amount of preparatory work is complemented by Office 1700 requires a different picture of the 18,038 pieces produced 3,629 blueprints and detailed drawings. Design and development of components required degree of accuracy in the critical angle is complicated: you 0.1 mm (0.04 inch) of the rivet holes in the corners of the society and worked one arcsecond.
The construction progress as finished components, subassemblies and riveted in the Paris suburb of Levallois-Perret in horse-drawn carriages from the factory, and the first is screwed together, the bolts are being replaced by rivets. No drilling or form on the site do not fit anywhere else, for a change, which was sent back to the factory. All joined the two and a half million rivets were 18,038 pieces.
At first, the legs are made as cantilevers but the central part of the construction of a wooden scaffolding to build the premier stopped. Appeared in the popular press the “suicide Eiffel “and” it has been confined in a shelter Gustave Eiffel’s Crazy” worried about the strength of the structure of the project, and gave rise to sensational headlines. At this stage, a small crane “climber” construction in progress and that the elevators were installed on each leg, with the help of a guide designed to climb the tower was installed on each leg. Critical step of linking all four feet on the first level was completed in March 1888. Metal was prepared with utmost precision , even though they carry out minor adjustments to align certain legs held : hydraulic jacks each leg , each capable of exerting a force on the base were adjusted to 800 tons of shoes , and feet intentionally scaffold is supported by the litter box , a slightly steeper angle than was necessary .
Especially thanks to Eiffel’s safety team because there were 300 employ and only 1 person died.
Secret of Eiffel Tower
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