-The pneumatic caisson method was used to dredge mud and pile successfully

"We exhausted our wisdom for thousands of days, but the bridge was blown up on the day of opening to traffic"

On November 11th, 1934, the Qiantang River Bridge started construction. Mao Yisheng, 39, was appointed as the chief designer and chief engineer of Qiantang River Bridge. At that time, the Japanese militaristic invaders had trampled on the northeast of China, and were eyeing North China and even China in an attempt to subjugate China. Although Mao Yisheng was not a politician, he loved his motherland, and his worries about the current situation kept him clear-headed. On July 7, 1937, the Lugouqiao Incident broke out. Mao Yisheng had a premonition that he didn't even want to face up to it, and made an important decision to wake the world-he left a rectangular hole on the No.2 pier in the south of the bridge. Mao Yisheng didn't explain to anyone why there was no major change in the original design. On August 13th, 1937, the Sino-Japanese War between Songhu and Shanghai finally broke out. Throughout September and October, the Sino-Japanese War between Songhu and Shanghai was extremely fierce. The smoke of war has spread over Hangzhou, and the construction of Qiantang River Bridge has entered the most tense stage. On September 26th, the lower single-track railway bridge of Qiantang River Bridge was first opened to traffic. Mao Yisheng hoped that Shanghai could stop the Japanese attack. However, the Battle of Songhu, which lasted for three months, ended in the fall of Shanghai, and Hangzhou was in danger. Exhausted Mao Yisheng has clearly felt that he is unable to grasp the fate of the bridge. On November 16th, Mao Yisheng received an order from the Nanjing government: If Hangzhou is not guaranteed, it will blow up the Qiantang River Bridge. The rectangular hole left by Mao Yisheng in the South No.2 pier is actually to prevent this moment from coming. That night, Mao Yisheng marked all the fatal points of Qiantang River Bridge with a rigorous and accurate attitude of a bridge engineer. Throughout the night, more than 1 wires were connected to a house on the south bank from all the tipping points. With the same pain as strangling his own baby, Mao Yisheng has been accompanying the bridge built through hardships until he saw the last lead connected with his own eyes. This is the most unforgettable, uncomfortable and painful day in Mao Yisheng's life. In the memories of his family afterwards, that kind of pain and helplessness really made him want to cry. On November 17th, it was the first day that the bridge that Mao Yisheng longed for but didn't dare to expect was fully opened to traffic. When the first car passed by the bridge, hundreds of thousands of people on both sides of the strait applauded hard and the applause lasted for a long time. Mao Yisheng later recalled: "All the more than 1, people who crossed the bridge that day, and those who crossed the bridge every day after that, everyone had to walk on explosives, and the train also flashed on explosives. On the first day of opening the bridge, there was explosives in the bridge, which is unprecedented in the history of bridges at all times and at all times! "

at 1 pm on December 23rd, 1937, Mao Yisheng finally received the order: blow up the bridge. At 5 o'clock in the afternoon, the vanguard of the Japanese army was faintly visible, the crowd was forcibly blocked, and all the fuses were lit. With a loud noise, two piers of Qiantang River Bridge were destroyed, and five-hole steel beams broke off and fell into the river. The Qiantang River Bridge, with a total length of 1,453 meters, which lasted for 925 days and nights and cost 1.6 million US dollars, was finally paralyzed in the bonfire of Japanese aggression on the 89th day of its opening to traffic. Japanese soldier You Yonghefu photographed the Qiantang River Bridge after the bombing in the smoke. A few decades later, Mr. Youyong Kazuo came to Beijing, and with remorse for the war, he personally handed this photo he took to Mao Yisheng. On the night when the bridge was blown up, Mr. Mao Yisheng stared at the remnants of the bridge blown up by himself through the boundless twilight, and looked at the increasingly bright flames on the north bank. Mao Yisheng wrote eight words on his desk with indignation: "If the war of resistance is won, the bridge will be restored". His wish was not realized until 1953 after the national liberation. Today, there are six bridges on the Qiantang River in Hangzhou, namely, the Second Qianjiang Bridge, the Third Qianjiang Bridge and the Fourth Qianjiang Bridge ... Only the Qiantang River Bridge stands in front of the Moon Mountain without changing its name. On the north bank of the bridge, a full-length bronze statue of Mao Yisheng was erected. People will always miss this outstanding bridge expert and deep patriot in China, and people will never forget this painful legendary history of Qiantang River Bridge.