June 9，In the receiving well on the right line of Mawan Cross-sea Passage in Qianhai, Shenzhen，Diameter 15．53 meters“Ma Wan”The slurry balance shield machine breaks through the rock，It marks the construction of public transport facilities in Shenzhen.、China Railway Southern Investment Group、The largest diameter submarine shield tunnel under construction in China jointly constructed by China Railway Tunnel Bureau Group——The right line of Shenzhen Mawan Cross-sea Passage is completed。

Shenzhen Mawan Cross-sea Passage is a key demonstration project of interconnection and transportation construction in Guangdong-Hong Kong-Macao Greater Bay Area.，It is also the first cross-sea passage in Shenzhen.。The project starts at the intersection of Mawan Avenue and Moon Bay Avenue in Qianhai Mawan Port Area.，Finally, Dachan Bay Toll Station and Jinwan Avenue of Dachan Bay Expressway along the Yangtze River in Baoan District－Intersection of Xixiang Avenue，The total length of the line is 8．05 kilometers，It is divided into two parts: ground road and underground road.，The planning grade of underground roads is urban expressway.，Six lanes in both directions，Design speed 80 kilometers per hour；The ground roads are planned to be urban trunk roads.，Six lanes in both directions，Design speed 40 kilometers per hour。Shenzhen Mawan Cross-sea Passage Project is divided into right line and left line.，China Railway Tunnel Bureau is responsible for the construction of the right line.——Bid 2 of Shenzhen Mawan Cross-sea Passage，The shield section of the project is 2063 meters long.，It is the control project of the whole line.。During construction，The excavation of soft strata in the reclamation area has been conquered.、World-class submarine tunnel construction problems such as long-distance soft and hard uneven strata and full-section hard rock strata under high water pressure。

In order to overcome one after another difficult problems in the construction of submarine tunnels,，China Railway South、The builder of China Railway Tunnel Bureau is“Ma Wan”Ultra-large diameter slurry balance shield machine“Tailor-made”，A number of targeted designs have been made.，Innovative use of atmospheric tool change technology、Tool real-time monitoring system、Large flow slurry circulation system and telescopic swing main drive system and many other cutting-edge technologies。Through good construction management，These targeted designs have greatly improved the efficiency of shield tunneling.，In the process, the project has achieved the national record of the maximum daily excavation of 10 meters in a single day.。

Using Scientific and Technological Innovation to Improve the Quality of Intelligent Construction of Subsea Tunnel。Builders vigorously promote the application of intelligent construction technology in construction，Relying on China Railway Tunnel Bureau“Smart Shield Big Data Platform”，Comprehensive Analysis of Whole Process Construction Data by Using Big Data System，Real-time intelligent monitor of tunneling parameter is realized、Automatic warning，And that underwater high efficiency of the super-large diameter shield is ensure.、Continuous、Safe tunneling，It has made an important exploration for the intelligent construction of submarine tunnels in China.。

In terms of green environmental protection construction of the project，Builders practice the concept of green development，Construction of Slurry Treatment Center at a High Level，Scientific Optimization of Slurry Pipeline Design，The in-pipe mud 100 is realized％ Collect ，Zero leakage of mud is achieved.、Control standard of zero pollution，Both the economic benefit and the environmental protection benefit of the project are considered。

It is reported that，After the completion of Shenzhen Mawan Cross-sea Passage，The road network structure of Shenzhen will be further improved.，Connect the freight traffic of Nanshan Port Area，And take into account Unicom Mawan.、Chiwan、Passenger traffic in Dachan Bay and other areas，To realize the separation of passengers and goods and the separation of transit in the Qianhai area，Further expand the space for urban development，Convenient transportation for Shenzhen people，To provide strong support for Shenzhen's strong transportation city，Help the construction of Guangdong-Hong Kong-Macao Greater Bay Area and Shenzhen Pilot Demonstration Zone of Socialism with Chinese Characteristics。（Worker's Daily client reporter Liu Jing）