HomeEconomic22,300 square meters of steel bridge deck pavement started in the Shenzhong...

22,300 square meters of steel bridge deck pavement started in the Shenzhong Channel in a single day-Chinanews.com



The steel bridge deck pavement of the Shenzhen-Zhongshan Passage began. Photo courtesy of Guangdong Provincial Communications Group



Chinanews.com, Guangzhou, January 19th (Cai Minjie Changda) The steel deck pavement of the Shenzhong Channel, the core hub project of the Guangdong-Hong Kong-Macao Greater Bay Area, began on the 19th, and the steel deck pavement construction on the left side of the Zhongshan Bridge was completed on the same day. The pavement area reached more than 22,300 square meters, setting a new historical record for hot-mix epoxy asphalt pavement on steel bridge decks in the world.

The Shenzhong Channel is a super-large cross-sea cluster project integrating “bridges, islands, tunnels, and underwater intercommunication”, with a total length of about 24 kilometers. The whole line pavement includes steel bridge deck pavement, concrete bridge deck pavement, subgrade section pavement, tunnel pavement and related drainage works, immersed tube tunnel leveling layer, etc.

The steel bridge deck pavement of the Shenzhen-Zhongshan Passage began. Photo courtesy of Guangdong Provincial Communications Group

The steel bridge deck pavement of the Shenzhen-Zhongshan Passage began. Photo courtesy of Guangdong Provincial Communications Group

Tang Lingwei, Project Manager of S15 Bid of Poly Changsha-Shenzhong Corridor Project, said that steel bridge deck pavement has always been defined by the industry as the “crown jewel” in pavement engineering. Constructing asphalt on a smooth steel plate is like paving plasticine on a glass surface. It is necessary to take into account the interlayer adhesion and shear resistance, and to ensure the driving function and durability.

The deep-middle passage adopts 6 processes and 5 major structural layers including “sand blasting and rust removal of steel bridge deck, epoxy zinc-rich paint, two layers of epoxy resin bonding layer, upper and lower layers of EA10 paving”, but the thickness is only 6.5 cm. The process standard requirements and construction difficulty are extremely high.

Faced with the large-scale steel bridge deck pavement and high construction requirements of the Shenzhong Channel, as well as the challenges of climate change, high temperature, high humidity, and high-salt open sea environment, the construction team after nearly 9 months of planning and preparation, and three test sections Supported by technical data and accumulated experience, we have developed three major systems: epoxy zinc-rich paint intelligent spraying system, epoxy resin intelligent brushing system and epoxy resin automatic weighing and delivery system, and built an information system that integrates dynamic video and Beidou positioning The platform creates a precedent for mechanized and intelligent construction in the whole process, which greatly improves the construction efficiency.

The steel bridge deck pavement of the Shenzhen-Zhongshan Passage began. Photo courtesy of Guangdong Provincial Communications Group

The steel bridge deck pavement of the Shenzhen-Zhongshan Passage began. Photo courtesy of Guangdong Provincial Communications Group

The epoxy resin intelligent painting system developed and applied by the project team for the first time in the world has replaced the traditional manual painting, and the efficiency of a single machine can reach 1500 square meters per hour, realizing the automatic production and painting of waterproof adhesive layer materials, construction Efficiency and quality have reached the world’s leading level.

At present, the construction of the Shenzhen-China Corridor is advancing in an orderly manner. The subsea tunnel has completed the installation of 31 immersed pipe joints, and the last joint (including the final joint) is being prefabricated; the construction of the east and west artificial islands is progressing steadily; the construction of the pavement and ancillary facilities of the Zhongshan Bridge is underway; Steel box girder hoisting construction. The project is scheduled to be completed and open to traffic in 2024. (Finish)


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