Umuhanda wa Hunan Tuotian & Bridge Engineering Machinery Co, Ltd. (hanyuma nyuma yitwa: Hunan Tuotian) iherereye mu mujyi uzwi cyane wa ba mukerarugendo - Chenzhou (Intara ya Hunan), min 20 uvuye kuri gari ya moshi yihuta ya Chenzhou Xi, Minuta 15 uvuye ku kibuga cya Chenzhou Beihu n'imodoka. Hunan Tuotian yongeye kuvugurura kuva muri Hunan Long March & Bridge Equipment Manufacturing Co., Ltd. na Hunan Shenghua Steel Struture Co., Ltd, nisosiyete yabigize umwuga yumuhanda & Bridge ihuza umusaruro, kugurisha, gushiraho & gusenya, serivisi zo kubungabunga no kubungabunga. Ibicuruzwa nyamukuru birimo: 321-Ubwoko bwabanjirije ikiraro cyumuhanda, ubwoko bwa 200 bwabanjirije ikiraro cy'ibyuma, Ikiraro cyabanyamaguru mumijyi, Byinshi-byubaka trestle, ubwubatsi nibindi.