13 years!This cross -sea bridge entering and leaving the Zhoushan for the first time is the first time to "change blood"

Zhejiang News Client Correspondent Yan Yongxian Shen Yining reporter Zhang Fan

On August 29th, the anchor room of the Xizhou Gate Bridge of the Zhizhou High Speed ​​Speed ​​Speed ​​Speed ​​Speed ​​Highway in and out of the Zhoushan High Speed ​​Bridge was receiving a "blood change treatment". The stress anchor system oil is replaced, which improves the corrosion effect of the anchor system and ensure the health and safety of the bridge structure.

The West Gate Bridge is one of the five bridges consisting of the Zhoushan cross -sea bridge. It is also the most difficult to build. The bridge has a total length of 2.588 kilometers. It has been opened for nearly 13 years. It was the suspension bridge of the first domestic and second span in the world at that time. The bridge has two anchor rooms in the south and north. The prestressed anchor anchor anchoring anchor anchoring anchoring system is used as a key structure of the Xilunmen Bridge. Essence The prestressed anchoring system of anchor chambers must be properly controlled by anti -corrosion protection. The temperature and humidity in the anchor room also have strict control requirements. Otherwise, the durability of the cable stocks in the anchor room of the bridge will be difficult to guarantee, which will affect the structural safety of the bridge. The anchor cable composed of galvanized steel twisted lines is usually kept on oil and fat. These oils such as "blood" protect the safety of the main cable of the bridge.

The prestressed anchoring system of the anchor room in the Xizhenmen Bridge adopts the "galvanized steel twisted line + oil" anticorrosive solution. After a long period of "service", the original oil has occurred to a certain degree of aging and liquefied phenomenon, which cannot guarantee the effects of anticorrosion. In order to ensure the carrying capacity of the prestressed anchor system and the overall structure of the bridge, the "Bridge Doctor" accurately diagnosed and decisively decided by the bridge management and maintenance, and the "diagnosis plan" was determined at the first time. The old oil in the stress anchor system is replaced. In the high temperature and heat, the "bridge doctors" began the healthy "treatment" of the prestressed anchor anchor system of an anchor chamber. First of all, the old oil in the embedded tube was exhausted. Then use the "syringe" -the high -pressure oil pump to pour new "blood" into the embedded tube until it is filled, and the observation mouth cover is restored after the end. This is a cycle to replace all the anticorrosive fats in all embedded tube.

Relevant sources of the Provincial Transportation Group Expressway Zhoushan Management Center of the Provincial Transportation Group, which organize the implementation of this "big blood change", said that it will continue to supervise the construction unit to reasonably arrange the construction, maintain quality, and grasp the progress. It is expected that it can be replaced at the end of September. The prestressed anchoring system of the "fresh blood" bridge anchor room will also add a new protective cover to escort the safe passage of the bridge.

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