Hangzhou City University

Hongshui Zhu

Yun Wang

Jun Zhao

Hanhua Zhu

Xinjiang Wei

Shiming Du

Zeyu Cheng

Tongchun Han

A telescopic device includes a first U-shaped connector with a plurality sets of adjustment slots defined in two sides thereof and arranged along an adjustment direction; a second U-shaped connector defining first through holes in two sides thereof, the second U-shaped connector being inserted into the first U-shaped connector with U-shaped openings thereof opposite to each other to define an accommodating space; a first spring located in the accommodating space and abutting against the first and second U-shaped connectors, respectively; an elastic pin with two ends thereof extending through the first through holes and engaging into one of the plurality sets of adjustment slots; and an initial fixing pin being detachably connected to the first and second U-shaped connectors. A telescopic annular tunnel steel arch includes an upper arch, two lower arches and two telescopic devices connecting two ends of the upper arch to the two lower arches, respectively.

Telescopic device and telescopic annular tunnel steel arch

Growing community of inventors

Zhejiang, China

Hongshui Zhu