Steel structure underground utility tunnel connected by flange plates

A steel structure underground utility tunnel connected by flange plates is composed of multiple steel pipe rack units and multiple extending-and-contracting units. The transverse flange plates at the ends of the pipe rack units or the ends of the extending-and-contracting units are connected by bolts, so that all the pipe rack units are connected together. The steel pipe rack units are hollow pipe-shaped bodies for containing municipal pipelines. The transverse flange plates are arranged at the ends of the pipe-shaped bodies. Each extending-and-contracting unit is composed of a steel plate capable of being bent repeatedly and the two transverse flange plates. The bending angle of each steel plate ranges from 10 degrees to 170 degrees. 种法兰盘连接的钢结构地下综合管廊，由多个钢管廊单元和多个伸缩单元组成，通过螺栓连接管廊单元端部或伸缩单元端部的横向法兰盘，从而将各个管廊单元连接起来；所述的钢管廊单元是用于容纳市政管线的中空的管状体，管状体的端部有横向法兰盘；所述的伸缩单元由反复弯折的钢板和两个横向法兰盘组成，钢板的弯折角度在10-170度之间。