Second, the terrain is complex. Longmen Bridge spans the sea area of Mao Wei. There are many underwater reefs in the bridge area, and the water flow situation is complicated, which increases the difficulty of design, survey and construction.
Third, the requirements for wind resistance are high. Longmen Bridge is located in a maritime climate and is easily affected by typhoons. Wind resistance of main bridge is a key problem in bridge design.
Fourth, the design and construction are difficult. Longmen Bridge adopts suspension bridge structure, and the main bridge has a long span, which puts forward higher requirements for the design and construction of main girder steel structure, cable tower and anchorage. The leaders of the autonomous region have listened to the special reports on the design scheme of Longmen Bridge for many times, demanding that the latest design concepts, technologies, materials and techniques at home and abroad be applied to the design and construction of the bridge, and that excellent design and construction units at home and abroad be selected to undertake the design and construction of the bridge, so as to build Longmen Bridge into the largest span cross-sea bridge in Guangxi and the landmark building of Beibu Gulf Economic Zone. By then, Longmen Bridge will become a unique and beautiful landscape of coastal cities in Guangxi.