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    The XCMG XR550D rotary drill for 133 meters deep piles in the Millenium Project

    The last bored pile of the main tower pier at the north of Shantou Niutianyang Super-large Bridge has been poured. The construction process shifts from the full underwater construction of a pile foundation to the half underwater construction of a bearing platform with double-wall cofferdam.

    XCMG XR550D rotary drilling rigs work for Niutianyang Super-large Bridge. Source: XCMG

    Work is still in progress on the completion of construction of the bridge that would connect the south and north banks of the Rongjiang River.

    The ambitious project will create the largest double bridge crossing the Rongjiang River in Shantou City and also boasts the tallest main tower: the main bridge will be 955 meters long and the main tower 183 meters high. The river crossing section on the bridge adopts a double layer structure with highway and railway built together. The main span is a double-storey cable-stayed bridge with a double tower and two-storey steel truss.

    Source: XCMG

    Within 11 days, XR550D conquer key and difficult problems.

    As an intersection of four rivers, magnitude-8 earthquake area and anchor of seagoing vessels, Niutianyang Super-large Bridge, designed with a public line shared by highway and rail, is called a “Millennium Project” for its complexity of construction.

    In 2019, the permanent steel casing for the first pile of No. 23 Pier of the main tower pier of Niutianyang Super-large Bridge was inserted in place, marking that this bridge entered the main structure construction stage.

    The pile foundation was drilled by XCMG XR550D rotary drilling rigs which worked only for 11 days. The drilling work guarantees that these bored piles are poured on time.

    Source: XCMG

    XCMG XR550D operates in the water for 133 meters deep pile

    The construction of bored piles of the main tower pier is one of the hardest project’s challenge: 40 bored piles with variable cross-section and diameter of 2.5 to 3 meters and length of 95.7 to 118.7 meters are set under a single bearing platform.

    The complex geology of the place certainly does not help a smooth progression of work. The pile foundation of the main tower pier is constructed by steel trestle on the water plus steel drilling platform. Facing the difficulty of construction on the submarine granite, XCMG XR550D still drill to 133 meters deep.

    According to the estimates of the work collected in April, the time needed for drilling a single pile hole is controlled at about 12 days, and 13 piles may be formed within a month.

    The cluster of pile foundations composed by high-performance marine concrete is firmly embedded in Rongjiang River like an anchor block, laying a solid foundation for the subsequent construction of the bridge.

    XCMG XR550D operate for Jiaojiang Super-large Bridge. Source: XCMG

    A record 143 meters, XCMG XR550D continue the legend

    This is certainly not the first battlefield for the XCMG XR550D drilling machine, built in 2016, which has already proven its reliability and excellent working performance many times over.
    Among the most important high engineering projects in which XCMG XR550D has participated, there are  Jiaojiang Super-large Bridge along the Hangzhou-Shaoxing-Taizhou Railway, Wuhan Qingshan Bridge, Xijiang Super-large Bridge of Guangzhou Nansha Port Railway and Chibi Yangtze River Bridge.

    XCMG can only be proud of this masterpiece of mechanical engineering, and we would like to remind you that in 2018 during the construction of Jiaojiang Super-large Bridge along the Hangzhou-Shaoxing-Taizhou Railway XCMG XR550D rotary drill broke the national record for the construction of ultra deep piles at 143 meters depth, far surpassing other drills in the industry.

    XR550D Building Construction hydraulic rotary Drilling Rig Model. Source: XCMG

    Source: XCMG