By Jenn Vaughn

Bridges and tunnels are lifelines. humans have tackled likely insurmountable hindrances, together with enormous canyons and mountain levels, to layout and build those extraordinary passageways. Bridges and Tunnels: examine Feats of Engineering invitations youngsters a long time nine and as much as discover the innovation and actual technology in the back of buildings our international will depend on. trivialities and enjoyable evidence illustrate engineering ingenuity and achievements. actions and tasks inspire young ones to profit in regards to the engineering strategy and to embody trial and blunder.

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WORDS to KNOW Strauss’s bridgemen were the first to wear hard hats and goggles on a construction job. 54 Amazing Bridges After four years of construction, the bridge opened in 1937. In a huge celebration called Pedestrian Day, a cheering crowd of 30,000 people paid a nickel each to walk the span of the bridge. Today, the iconic Golden Gate Bridge still looks sleek, elegant, and strong. ” The burnt orange color blends with the bay’s stunning natural landscape. Painting the bridge is an ongoing, important part of its upkeep.

It is used for underwater construction. Construction began in 1870. It required using wooden caissons. Builders used these 3,000-ton devices to secure towers deep underground, under the river. The caissons were enormous airtight, watertight chambers with a closed top and an open bottom. The chamber was lowered into position at the bottom of the river. Crews of men were lowered into the chamber each day where they worked using hand picks and shovels to dig out the mud and sediment from the mucky riverbed.

Emily Roebling responded by demonstrating the bridge’s safety herself. When the Brooklyn Bridge officially opened in 1883, she was the first to cross it. Schools and shops closed so crowds could cheer the festivities. As they watched, a horse galloped across the span pulling Emily Roebling in an elegant carriage. In her arms, she held a crowing rooster as a symbol of victory. With a fireworks celebration that dazzled thousands, the Brooklyn Bridge opened to the public. President Chester A. Arthur strolled across the bridge with huge crowds watching from both sides of the river.

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Bridges and Tunnels by Jenn Vaughn

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