Today (19th), the steel bridge deck paving of the deep-middle channel of the core hub project of the Guangdong-Hong Kong-Macao Greater Bay Area began, and the paving construction of the left steel bridge deck of the Zhongshan Bridge was successfully completed on the same day, with a paving area of more than 22,300 square meters in a single day, once again refreshing the historical record of hot mix epoxy asphalt paving of steel bridge deck in the world. The project is scheduled to be completed and opened to traffic in 2024.
At present, the construction of the Shenzhen-Middle Channel is progressing in an orderly manner. The submarine tunnel has completed the installation of 31 immersed pipe sections and is undergoing prefabrication of the last pipe section (including final joints); The construction of artificial islands in the east and west is steadily advancing; The Zhongshan Bridge is undergoing pavement and ancillary facilities; Lingdingyang Bridge is carrying out steel box girder lifting construction.
It's like laying plasticine on a glass surface
The Deep-Middle Passage is a super-large cross-sea cluster project integrating "bridges, islands, tunnels and underwater interconnection", with a total length of about 24 kilometers. The whole line surface paving includes steel bridge deck paving, concrete bridge deck paving, roadbed section pavement, tunnel pavement and related drainage engineering, immersed tunnel leveling layer, etc., which is constructed by the project department of S15 contract section of Poly Changshen Middle Channel Project.
The deep middle channel adopts 6 processes and 5 structural layers, including "steel bridge deck sandblasting and rust removal, epoxy zinc-rich paint, two epoxy resin bonding layers, and EA10 paving upper and lower layers", but the thickness is only 6.5 cm, and the process standard requirements and construction difficulty are extremely high.
Tang Lingwei, project manager of the S15 standard of the Poly Changshen Middle Passage Project, said that steel bridge deck paving has always been defined by the industry as the "crown jewel" in pavement engineering. Applying asphalt on smooth steel plates is like laying plasticine on a glass surface, which requires interlayer bonding and shear resistance while ensuring driving function and durability. At the same time, the connection and correlation requirements between various processes far exceed the ordinary asphalt concrete construction standards, and rigorous and scientific extreme leanness is required in all aspects such as construction process control, all-factor control and construction organization management.
Yang Donglai, deputy chief engineer of Poly, focused on the steel bridge deck paving process, he said that the steel bridge deck paving process is extremely harsh, in order to ensure the durability of the bridge deck, the construction process must be strictly controlled by oil and water, absolutely can not produce early diseases. At the same time, it is necessary to accurately control the process parameters of each construction link, according to the current paving speed of 3 meters / minute, the roller rolling speed must be strictly controlled at a speed of 2.88 km / h, only in this way can it make a steel bridge deck with good durability and high driving comfort.
One paving is equivalent to 53 basketball courts
Faced with the new challenges of large-scale paving of the steel deck of the deep-middle passage, high construction requirements, and the changeable climate and high temperature, high humidity and high salt offshore environment, the construction team developed three major systems: epoxy zinc-rich paint intelligent spraying system, epoxy resin intelligent painting system and epoxy resin automatic weighing and delivery system after nearly 9 months of planning and preparation, technical data support and experience accumulation in three test sections, and built an information platform integrating dynamic video and Beidou positioning, creating a precedent for mechanized and intelligent construction in all links. It greatly improves the construction efficiency.
The epoxy resin intelligent painting system developed and applied by the project team for the first time in the world replaces the traditional manual painting, with a single efficiency of 1500 square meters / hour, realizing the automatic production and painting of waterproof adhesive layer materials, and the construction efficiency and quality have reached the world's leading level.
Tang Lingwei introduced that on January 19, the project put into 48 sets of pavers, road rollers, transport vehicles, etc., and more than 160 on-site workers and management personnel to ensure that the construction process is well connected, the construction surface is formed at one time, and the construction requirements are met with excellent internal and external beauty, anti-corrosion and durability.
The steel bridge deck of the deep-middle channel is currently the world's largest epoxy asphalt paving construction, with a paving scale of 380,000 square meters, and a single day paving area of more than 22,300 square meters, equivalent to the size of 53 standard basketball courts, breaking the world record for asphalt concrete paving of the same type.
Work does not stop during the Spring Festival holiday
The person in charge of the Shenzhong Passage Management Center said that the steel bridge deck paving has been fully opened for the Shenzhong Passage pavement project, and more than 400 pavement construction builders have seized the golden period of construction during the Spring Festival and gone all out to grasp the construction.
Geng Yuming, a "father and son soldier" from Anhui Province who participated in the construction of the Shenzhen-Zhongshan Corridor, and his son said that in order to complete the task of paving the steel bridge deck in the dry season, their family of six will be reunited at the Shenzhen-Zhongshan Passage project. At present, the project department has prepared and arranged a wealth of team building activities such as the New Year dinner and barbecue, and they are both proud and looking forward to spending a warm and fulfilling Spring Festival in Guangdong.
Guangzhou Traffic Radio reporter Xiaohui, correspondent Yue Jiaoxuan, Chang Da, Cheng Kai, Chen Wenxin's report.