 In Fujian Province , enormous beam bridges were built during the Song dynasty . Some of these were as long as 1 @,@ 220 m ( 4 @,@ 000 ft ) , with individual spans of up to 22 m ( 72 ft ) in length ; their construction necessitated moving massive stones of 203 t ( 203 @,@ 000 kg ) . No names of the engineers were recorded or appear in the inscriptions on the bridges , which give only the names of local officials who sponsored them and oversaw their construction and repair . However , there might have been an engineering school in Fujian , headed by a prominent engineer known as Cai <unk> ( 1012 – <unk> ) , who had risen to the position of governmental prefect in Fujian . Between <unk> and 1059 , he planned and supervised the construction of the large <unk> Bridge ( once called the Luoyang Bridge ) near <unk> ( on the border of the present @-@ day <unk> District and Huai 'an County . This bridge , a stone structure similar to a number of other bridges found in Fujian , still stands , and features ship @-@ like piers bound to their bases using <unk> from <unk> as an <unk> . It is 731 m ( 2 @,@ 398 ft ) in length , 5 m ( 16 ft ) in width , and 7 m ( 23 ft ) in height . Another famous bridge near <unk> , the <unk> Bridge , was constructed between 1138 and <unk> . 
