Telescopic device and circumferential telescopic tunnel steel arch

Telescopic device and circumferential telescopic tunnel steel arch

The utility model discloses a telescopic device and an annular telescopic tunnel steel arch, the telescopic device comprises a first U-shaped connecting piece, a second U-shaped connecting piece, a third U-shaped connecting piece and a fourth U-shaped connecting piece, the two sides of the first U-s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: HAN TONGCHUN, CHENG ZEYU, ZHAO JUN, ZHU HANHUA, WEI XINJIANG, WANG YUN, ZHU HONGSHUI, DU SHIMING
Format: Patent
Sprache:chi ; eng
Schlagworte:
EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
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Beschreibung
Zusammenfassung:The utility model discloses a telescopic device and an annular telescopic tunnel steel arch, the telescopic device comprises a first U-shaped connecting piece, a second U-shaped connecting piece, a third U-shaped connecting piece and a fourth U-shaped connecting piece, the two sides of the first U-shaped connecting piece are provided with a plurality of groups of adjusting grooves arranged along the adjusting direction; first through holes are formed in the two sides of the second U-shaped connecting piece, the second U-shaped connecting piece is inserted into the first U-shaped connecting piece, and U-shaped openings of the second U-shaped connecting piece and the first U-shaped connecting piece are oppositely arranged to form a containing space; the first spring abuts against the first U-shaped connecting piece and the second U-shaped connecting piece and is located in the containing space. The two ends of the elastic plug pin penetrate through the first through holes in the two sides and then are inserted