Application of Raise Boring Machine to Construction of Combined Coal Bunker
LIU Guo-shen
Abstract：A middle coal bunker in Ji4 Mining Block of No.5 Mine in Pingdingshan Tian’an Coal Com pany Limited was a combined coal bunker with a vertical bunker and a high inclined bunker. A de signed depth of the vertical bunker was 42.5m. The vertical bunker was a round cross section. The net diameter of the vertical bunker was 4m and the excavation diameter was 4.8m. A designed length of the inclined bunker was 23.1m with an inclination of 65° and the bunker was a round cross section with a net diameter of 3m and excavation diameter of 3.8m. In the constructions of the vertical bunker and the inclined bunker,a raise boring machine was first applied to the pilot drilling and to the pilot borehole reaming. Then a conventional drilling and blasting method was applied to the reaming of the bunker. A bolt and steel mesh was applied to the temporary support of the bunker,a reinforced con crete was applied to the permanent support of the bunker and the short section excavation and lining method was applied. A total construction period of the combined coal bunker was 85 days,the con struction mission was completed on schedule,the project quality was excellent and a good evaluation was made by the project owner.
Keywords：combined coal bunkerraise boring machinehigh inclined bunkervertical bunkersmooth blasting
Publication Date：2014-07-28
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 23-25,11 )