Since the 20th century, 80's, prestressed concrete in building construction in China is widely used, then gradually applied to the bridge structure.

自20世纪80年代开始，无粘结预应力混凝土在我国房屋建筑中得到广泛的应用，后来逐渐被应用于桥梁结构中。

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Cable force is important in cable-stayed bridge 's design and construction. The method of measuring frequency of its own to estimate cable force is widely used in bridge engineering.

索力是斜拉桥设计和施工的重要依据，根据测得的固有频率估算索力的频率法在桥梁工程中广泛应用。

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In February, three workers were killed and six injured when a concrete block of a bridge under construction at Mumbai's international airport collapsed.

WSJ: Building Collapse Kills 50 in Mumbai Suburb

In Mumbai, three workers at a bridge-construction site at the city's airport were killed after a concrete block fell on them in February.

WSJ: India Police Arrests Nine in Building Collapse

That came after the collapse of a bridge that was under construction as part of the city's mass-rapid transport system in September last year, killing one person.

WSJ: Death Toll in Mumbai Building Collapse Hits 74