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

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...

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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
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creator DU, Shiming
HAN, Tongchun
WEI, Xinjiang
CHENG, Zeyu
WANG, Yun
ZHU, Hanhua
ZHU, Hongshui
ZHAO, Jun
description 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 an adjustment direction; a second U-shaped connecting member, both sides of which are provided with first through holes, the second U-shaped connecting member being inserted into the first U-shaped connecting member, and U-shaped openings of said connecting members facing each other so as to form an accommodating space; first springs, which abut against both the first U-shaped connecting member and the second U-shaped connecting member, and are located in the accommodating space; an elastic pin, both ends of which pass through the first through holes in the two sides and then inserted into one set of the adjusting slots; and an initial fixing bolt which is detachably connected to the first U-shaped connecting memb
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subjects EARTH DRILLING
FIXED CONSTRUCTIONS
GALLERIES
LARGE UNDERGROUND CHAMBERS
MINING
SHAFTS
TUNNELS
title EXTENSIBLE-RETRACTABLE DEVICE AND ANNULARLY EXTENSIBLE-RETRACTABLE TUNNEL STEEL ARCH
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