E21D 8 - Shafts not provided for in groups

Patents for E21D 8 - Shafts not provided for in groups (10)
01/2015
01/07/2015	CN204082153U 一种锐角连接的竖井结构 An acute angle shaft structure connected
07/2014
07/23/2014	CN103939105A 一种于地下工程上方布设施工竖井的施工方法和结构 A layout construction methods and structural construction shaft above the underground works
05/2014
05/21/2014	CN103806916A 一种盾构快速检修井的施工工艺 A shield tunneling process quick overhaul wells
12/2013
12/25/2013	CN203362165U Safety and ventilation structure during shaft building period
10/2013
10/16/2013	CN103352700A Method for preventing shaft from cracking in alleviation water-bearing layer by utilizing automatic supply water loss method
05/2013
05/22/2013	CN101985881B Method for preventing vertical shaft wellhole from being damaged
07/2012
07/04/2012	CN102536249A Fast construction method of headframe lifting system
03/2011
03/16/2011	CN101985881A Method for preventing vertical shaft wellhole from being damaged
01/2010
01/13/2010	CN201381858Y Slag discharge and unloading device of vertical shaft gantry crane
08/2009
08/19/2009	CN201292851Y Vertical shaft head sealing oil groove