Patent problems involved in telescopic device of unit multidirectional displacement comb slab bridge. A bridge design paper uses a device called "unit multi-directional displacement comb"

The expansion joint of the multi-directional displacement comb expansion device of the unit meets the requirements of JT/T723-2008 (recommended industry standard of the Ministry of Communications). JT/T723-2008 standard in this sentence is an industry standard compiled by Ningbo Lubao Science and Technology Industry Group Co., Ltd. At present, most domestic manufacturers can produce this kind of unit multi-directional displacement comb telescopic device, provided that the drawings drawn by the design institute do not specify RB model.