Shenzhou "first saw" successfully cut the giant bridge tower of Nanpanjiang Bridge
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It is understood that the original Nanpanjiang Bridge is located on the Nanpan River of the Anlong-Hongjiang section of National Highway 324 (Fuzhou-Kunming). The total length of the whole bridge is 477.23 meters. The main bridge of the bridge is a steel truss suspension bridge with a span of 240 meters. It was completed and put into operation in November. In recent years, due to the significant increase in traffic flow, the passing vehicles have exceeded the overload limit and caused serious damage to the bridge. The Nanpanjiang Bridge has become one of the 18 dangerous bridges in the country. The Guizhou Provincial Department of Transportation, the Provincial Highway Bureau, and the Xingyi Highway Administration decided to carry out demolition and reconstruction of the main bridge and repair and reinforcement of the approach bridge.
“The last demolition process of the steel truss suspension bridge is the cutting and hoisting of the main tower. It is necessary to cut the concrete bridge tower with a section of nearly 14 square meters, which is the first case in China.†Demolition and reconstruction of the main bridge of Nanpanjiang Bridge of Guizhou Bridge Construction Group Corporation Project manager Yang Yucheng told the author. Later, he introduced that when the main tower was demolished, first draw the block cutting diagram according to the demolition plan, use the ruler on the tower column and make the marking line, then use the diamond wire saw to cut along the block line horizontally, then vertically. After cutting a knife, the 4.8 m × 2.8 m × 0.6 m concrete block was cut into two pieces, each weighing about 15 tons, and then suspended by a crane to the bridge deck and then loaded and transported.
It is reported that the giant upper beam of the main tower of Nanpanjiang Bridge is 9 meters × 3.2 meters × 1.5 meters, and the maximum weight is 40 tons. The total cutting time is 20 days.