The deck of Humen Bridge is terrible. Is it caused by adding a retaining wall?

The deck of Humen Bridge is terrible. Is it caused by adding a retaining wall?

Humen Bridge, which was completed and opened to traffic in 1990s, is known as? The first span in the world? . However, in May this year, the bridge deck was terrible, and people saw the new retaining wall and took it as the culprit. So is this really the cause of the bridge deck restlessness?

Obviously, the additional retaining wall is not the main reason. With a total investment of nearly 3 billion yuan, the bridge is one of the top ten landmarks in Guangdong. As a tourist attraction in Guangdong, the main deck will not shake just because of a retaining wall. Besides, such a grand construction project must be done by the master. How can it be easily overthrown?

First reason

The dock has sunk. Because Humen Bridge is located in the economic complex area of Pearl River Delta, the traffic volume is huge, which leads to the settlement of the pier of the main bridge, which leads to the deck jitter. Humen Bridge starts from Humen Weiyuan in the east and connects Nansha in the west, spanning the Pearl River Estuary, with a total length of 15.78 km, connecting the east and west wings of Guangdong. In July 1997, Hong Kong was opened to traffic on the day of the handover. As a gift from the people of Guangdong Province to the return of Hong Kong, how can there be problems in design and construction? The most convincing explanation is that the traffic flow is too large and the load is too heavy all the year round, which leads to the main pier being crushed. Therefore, the bridge deck has shifted and then swayed, which is a very likely reason.

Second reason

The reinforcement inside the concrete pier has expanded. Anyone who has studied the knowledge of stress in college physics should know that metal fatigue will occur if the stress range is exceeded many times during use. Metal will become longer after fatigue and will not return to its original length. If the elongation exceeds the allowable range, it is reasonable for the bridge deck to be abnormal. If the length is increased within the allowable range, the safety of the bridge can still be guaranteed under the condition of controlling traffic flow. This may also be the main reason for bridge deck jitter.

The third reason.

Has the geology under the bridge changed? If the address under the bridge has changed greatly, it will have a great impact on the bridge. After all, the change of terrain may not be within the designer's key consideration. After 23 years of wind and sun exposure and the influence of the current below, it is reasonable for the terrain to change. It is suggested that the original construction unit can compare the terrain under Humen Bridge with the terrain when it was built that year. We will deal with it after we get a reasonable investigation report. It seems that the shaking of the bridge deck is also related to geological changes.

Based on the above three reasons, these aspects can be investigated for bridges. If these are not the main reasons, then all the equipment added after completion can be removed (including the added retaining wall). Because the windward side of the bridge increases, it will also affect the whole bridge.