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With the roaring of super-high-power rotary drilling rigs, the pile foundations of the main piers of Lingdingyang Bridge and Zhongshan Bridge are in addition to drilling, symbolizing that the construction of the shallow passage bridge project has entered the implementation stage. Mayor Jiao Lansheng and Secretary General of the Municipal Government Li Jun attended the on-site meeting.

After a detailed understanding of the drilling construction situation, Jiao Lansheng advocated that he should study and implement Xi Jinping's new era of socialism with Chinese characteristics and the party's 19 small spirits in detail, take root in the "three orientations" of the provincial party committee to deprive Zhongshan of the "three orientations", prepare the "east inheritance" article, and enhance the "north connection" function. The whole line of bridge pile foundation drilling, symbolizing the shallow passage bridge construction into the implementation stage. We should be strict in accordance with the construction requirements to ensure the safety of the project, do everything possible to ensure the quality of construction, try our best to speed up the construction progress, as Zhongshan is getting worse and worse into the construction of Guangdong, Hong Kong and Macao Bay Area to obtain key support.

Lingdingyang Bridge is located in the vast waters of Lingdingyang, the Pearl River Estuary. It is a typhoon-prone area with a main hole span of 1666 meters. As a suspension bridge with a small span in the sea in the world, the main tower is 270 meters low, the navigable net low is 76.5 meters, and the bridge deck is 91 meters low. It is very high at 30 floors. After completion, it will be a global sea bridge.

According to the explanation, the wind resistance safety problem of Lingdingyang Bridge is noticeable. The main bridge is an offshore structure of the whole platform, and the two giant anchorages are both located in the sea. There is no engineering practice in China to ensure the stability of cofferdam structure and island body in deep water area and deep soft foundation. It is difficult to learn reference experience and the challenge is small.

It is said that the west and west tower foundations of Lingdingyang Bridge all use pile group foundation structure. The tower foundation is 56 bored piles, with a total of 112 piles in the two towers, in a plum blossom layout. It erodes granite bearing stratum into the tower. It has the characteristics of small pile diameter, shallow rock depth, simple geological conditions (the west tower foundation must pass through the erosion debris zone, and the small piles are 140 meters long), and the drilling difficulty is small. The foundation of the main tower of Zhongshan Bridge is laid out with 28 bored piles, with a total of 56 piles for the two towers. After the completion of the drill bit, the process of lowering the reinforcement cage and concrete pouring will be carried out at intervals, and all pile foundation works will be completed in September 2020.

As the key hidden works of the bridge, the quality of pile foundation works indirectly agrees with the durability, safety and service life of the bridge. Compared with the bridge pile diameter of the regular land section, which is mostly about 1.5 to 2 meters, the bridge in the shallow middle passage sea section uses 3 meters of super-large diameter bored piles, which have smaller and smaller bearing capacity and rigidity.