Composite thin-shell sand-building cofferdam protection system for bridges

The invention discloses a composite thin-shell sand-building cofferdam protection system for bridges. The composite thin-shell sand-building cofferdam protection system for the bridges is characterized by comprising a cofferdam shell (1), buffer energy-consuming materials (2) are filled in the cofferdam shell (1), a cover plate (3) is used for covering the top end of the cofferdam shell (1), and the lower end of the cofferdam shell (1) which is filled with the buffer energy-consuming materials (2) and uses the cover plate (3) for covering the top end is positioned in a riverbed or fixed on a bearing platform. The composite thin-shell sand-building cofferdam protection system for the bridges is large in elastic deformation and capable of sufficiently absorbing impact energy and blocking off impact when used, so that the bridges are protected while ship bodies cannot be damaged severely, and damage of the ship bodies is reduced to the minimum extent; and since the cofferdam shell is made of composite fiber reinforced materials which are highly corrosion-resisting and excellent in mechanical property, the system is adaptive to various severe environments of river water, seawater and the like, has the advantages of simple structure, low manufacture cost, lower maintenance cost and convenience in mounting and maintenance and is suitable for popularization and use.