EXTENSIBLE-RETRACTABLE DEVICE AND ANNULARLY EXTENSIBLE-RETRACTABLE TUNNEL STEEL ARCH

Disclosed in the present invention are an extensible-retractable device and an annularly extensible-retractable tunnel steel arch. The extensible-retractable device comprises: a first U-shaped connecting member, both sides of which are provided with a plurality of sets of adjusting slots arranged in...

Ausführliche Beschreibung

Bibliographische Detailangaben

Hauptverfasser:	DU, Shiming, HAN, Tongchun, WEI, Xinjiang, CHENG, Zeyu, WANG, Yun, ZHU, Hanhua, ZHU, Hongshui, ZHAO, Jun
Format:	Patent
Sprache:	chi ; eng ; fre
Schlagworte:	EARTH DRILLING FIXED CONSTRUCTIONS GALLERIES LARGE UNDERGROUND CHAMBERS MINING SHAFTS TUNNELS
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!