共筑“龙门”，逐梦江海

Core Viewpoint - The completion and opening of the Longmen Bridge, the longest cross-sea bridge in Guangxi, significantly reduces travel time between Fangchenggang and Qinzhou Port from 1.5 hours to 25 minutes, showcasing the dedication and expertise of the builders [1][18]. Group 1: Construction and Engineering Challenges - The Longmen Bridge construction began in August 2020, with the final three main cable strands successfully installed in April 2023, overcoming challenges such as strong coastal monsoon climates and nighttime high-altitude safety risks [3][9]. - The main cable, a critical load-bearing component of the bridge, consists of two cables, each made up of 127 strands with a diameter of approximately 75 cm, essential for distributing the bridge's weight [6][11]. - The construction team utilized high-precision GPS technology to ensure the accurate installation of each cable strand, maintaining high engineering quality standards [7][9]. Group 2: Innovative Techniques and Safety Measures - To ensure the safety and quality of the steel box girder installation, the team advanced the construction schedule to minimize the impact of typhoons, employing an innovative "two-in-one" lifting technique to accelerate the installation process [9][11]. - The design of the new steel box girder effectively reduces construction costs while enhancing wind resistance, addressing issues like vortex-induced vibrations and flutter that could affect bridge safety [11][13]. - Safety measures included designing construction access bridges to accommodate fire trucks and establishing rescue boats at sea, ensuring worker safety during construction [11][13]. Group 3: Environmental Considerations - The construction of the Longmen Bridge integrated ecological protection measures, including rerouting the design to avoid core mangrove protection areas, which increased project costs by approximately 500 million [13][16]. - Innovative construction methods, such as the "insertion method," were employed to minimize disruption to the mangrove ecosystem, allowing for a harmonious coexistence of construction and environmental preservation [16][13]. - Continuous ecological monitoring of the mangroves beneath the bridge is conducted to ensure their health and growth during and after construction [16][13]. Group 4: Economic Impact - The Longmen Bridge plays a crucial role in enhancing the integration of the Beibu Gulf region, facilitating high-quality development in the North Qinzhou area and supporting the construction of the new western land-sea corridor [16][18].