Following the Shenzhen-Zhongshan Link and the Huangmaohai Cross-Sea Link, another super project in the Guangdong-Hong Kong-Macao Greater Bay Area, the Shiziyang Link project, is adding new milestones in its year-end sprint.
On December 20, Guangdong Transportation Group announced that with the pouring of the last truckload of concrete, the core-filling construction of the east anchorage of the Shiziyang Bridge—a key controlling works of the Shiziyang Link project—was successfully completed.
The weight of the core fill is equivalent to six large aircraft carriers
As a massive component that secures the ends of the main cables of a suspension bridge and prevents their displacement, the anchorage is crucial to bridge safety.
The main bridge of the Shiziyang Link, the Shiziyang Bridge, has east and west anchorages. The east anchorage of the Shiziyang Bridge adopts a unique circular gravity-type design, with a total core-fill height of 21.5 meters. Since core-filling construction began on July 8 this year, a total of 164 days have elapsed, during which the project construction team completed 192,000 cubic meters of concrete pouring for the east anchorage, with a single continuous pour reaching as much as 18,000 cubic meters, totaling 476,000 tons of core fill—equivalent to the weight of six large aircraft carriers.
In mass concrete construction, temperature control is a critical element.
"Advanced intelligent integrated temperature control technology was adopted in the core-filling construction of the east anchorage. Through a dense network of cooling water pipes and an automatic temperature control system, precise real-time monitoring and dynamic regulation of concrete temperature were achieved," introduced Lu Zisheng, deputy project manager of the T9 contract section of the Shiziyang Link undertaken by Poly Changda.
Through the intelligent integrated temperature control technology, the project construction team effectively solved the temperature control challenge in mass concrete construction, ensuring that the internal temperature of the concrete always remained within a safe range, effectively preventing the occurrence of temperature cracks, and greatly improving the overall quality of the concrete structure.
New materials and new technologies intelligently create two giant "cores"
"During the core-filling construction, the project construction team adopted a number of innovative technologies," introduced Zhang Taike, chief engineer of Guangdong Bay Area Transportation Construction Investment Co., Ltd., including the application of C40 anti-corrosion concrete to improve the impermeability and crack resistance of the concrete. Under multiple protective measures, the core-fill concrete of the east anchorage can withstand the test of various complex environments over the long term.
As the controlling works of the project, the Shiziyang Bridge adopts a double-deck steel truss suspension bridge scheme with a main span of 2,180 meters, crossing the river in a single span. It is currently one of the bridges with the greatest technical difficulty and the most complex construction technology in the world. Once completed, it will set five world records for double-deck suspension bridges: main span length, number of lanes, main tower height, anchorage foundation, and main cable scale.
With the successful completion of the core-filling construction of the east anchorage, at the end of December, the west anchorage, constructed by CCCC Second Highway Engineering Co., Ltd., will also complete the final layer of core-filling construction. The successful completion of the core filling of the two giant anchorages marks that the construction of the Shiziyang Link has entered a new stage.
The Shiziyang Link is another super project in the Guangdong-Hong Kong-Macao Greater Bay Area following the Hong Kong-Zhuhai-Macao Bridge and the Shenzhen-Zhongshan Link. Once completed, it will open up a new important corridor for the integrated development of the east and west banks of the Pearl River Estuary, and is of great significance for promoting the integrated high-quality development of the Pearl River Estuary in the Greater Bay Area and building the 100-kilometer "Golden Inner Bay" around the Pearl River Estuary.
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