Tag Archives: Bridge

Hong Kong-Zhuhai-Macau Bridge: The World’s Longest Sea Crossing

The world’s longest sea crossing connecting Hong Kong with Macau and Zhuhai opened this week in China. The unusual bridge cum tunnel system consist of a series of three cable-stayed bridges and one undersea tunnel, as well as two artificial islands for a total length of 55 km.

The largest part of the crossing is the 30-km-long Main Bridge, which is actually a bridge and a 6.7 km undersea tunnel that dips beneath the Pearl River Estuary and emerges at the other end just before the Hong Kong border. The undersea tunnel was built to avoid disrupting shipping lanes. The route then continues over a 9.4-km-long viaduct and ends at Chek Lap Kok, the island where Hong Kong International Airport is located.

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The Hong Kong-Zhuhai-Macau Bridge Read the rest

How The London Bridge Was Sold to America

For centuries, children and kindergarteners have sung and danced to the tune of London Bridge is falling down, but when engineers discovered that the London Bridge was actually falling down in the early 1900s, it was no laughing matter. The stone bridge was just over a century old, and was the busiest point in London crossed by 8,000 pedestrians and 900 vehicles every hour. Surveyors found that the bridge was slowly sinking—about one third of a centimeter every year. When measurements were taken in 1924, they found that the bridge’s east side stood some 9 cm lower than the west side. Another four decades had passed before the City Council could arrive at a decision.

Council member Ivan Luckin suggested that instead of demolishing the … Read the rest