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Shotcrete support during construction of stone stand in the application of thick coal seam


Spray when the meeting, the general make up spray after 2 to 3 times stable. 6 speed and support materials, construction cost analysis, compared with the expected stone Roadways, construction speed. Twelve West Five Shihmen net support using shotcrete coal by 12 pm. 25d time job only three shifts; and over the past 12 coal seam Shihmen other stone materials to Gateway support normally takes about 40d. Shotcrete net support the use of a steel mesh,[link widoczny dla zalogowanych], coupled with greater use of slotted tube bolt, and its supporting material costs are higher than Roadways,[link widoczny dla zalogowanych], but compared to the metal support arch support, low cost. (The switch 9) 1 King Yao Lan Power Failure Analysis and Control of Roadway Tunnel has three construction. Several rock stress redistribution. More importantly, construction blasting vibration effects of construction of the tunnel behind the shooting have each been construction on the surrounding roadway vibration, so that roadway spray layer cracking. Cracking the site has been exacerbated damage. 4 effects of the comprehensive management measures and construction of the tunnel has been the progressive completion of several construction and basic elimination of disturbance, in order to completely repair roadway, the key is the first good water governance. Roadway to serve the south side 25a or more, if not complete control,[link widoczny dla zalogowanych], once per 3a repair, to repair 8 times the total roadway maintenance costs are too high, but also affect the production, so it is still more reasonable one-time thorough repair. Therefore, adopting the following comprehensive measures. (1) a ground sink hole grouting, filling pores and cracks traction, blocking water access. In the fall of the column layout of six holes, aperture ≠ 125mm, end hole in the roadway at the top 6m. Taking into account the fall of the column is not filled with dense rock, a difficult hole grouting upstream, so the use of sub-sub-sub-sub-grouting drilling down grouting, grouting section of a high-8m. Taken after the core hole to play before the test hole grouting. Use a glass double liquid slurry of cement, co-injection grout 8260m. . (2) damage to roadway segments combined with shotcrete support network repair. First, the destruction of sites of damage to clean up the roadway. Try to help find the top live rock floating refuse, and then spray a layer of 3o ~ 50ram thick concrete, call anchor, hanging metal mesh, and finally re-spraying concrete over 120mm thick, with 8 metal wire, specification is 4000ram × 800mm, mesh size of ~ 50mm × 50mm,[link widoczny dla zalogowanych], pressure stubble 100mm. 14ram × 1800ram bolt metal bolt used, inter-row spacing is 600mm × 600ram, streaky-shaped layout, rapid hardening cement anchor ends after drug injection volume of cement mortar to reach full length. (3) tunnel grouting. Section of roadway in repair damage after reinforcement, the use of ultrasound detector broken loose roadway level of detection, and then grouting. Grouting holes for a 26-type pneumatic drill with YTP (42mm drill bit) hole, 25mm grouting pipe, hole depth ultrasound probe according to the situation, generally between the 8oO ~ 1400mm. Side edge of grouting holes, hole distance 4m, three flower-shaped layout. (4) all with the concrete pouring roadway ditch and spread the bottom, a few of the above water in the roadway floor all be processed in order to prevent direct contact of water with the rock into rock. (5) local Gallery in the roadway floor cut energy release slot. Can be tanks on the location of release, the tape machine Lane election based on the belt at the shelf, measures horizontal roadway layout, each 3m one slot length 1400mm, cross section 400ram × 500ram; Track Lane elected position in permanent orbit, along the length of roadway layout , slot section is 1200mm × 500mm, the actual construction of the orbital position of the floor in the deep holes to play 600ram blasting waste rock out to a standard floor to 200mm at the next, and then laying gravel pad. 3 roadway repair all end at the end of 1994, after more than 2a observation,[link widoczny dla zalogowanych], roadway stability, does not appear the phenomenon of deformation and failure. About King Yao, male, born in 1955, senior engineer in 1982 from School of Mines, and now coal-based Jiangsu company a work bag, and has published many papers (on the next page 16) Twelve West Fifth Shihmen 7 Conclusion No. l2 Coal in October 1996 for construction of shotcrete net support, has been nearly 2a, has entered the recovery phase of mining area later. Shotcrete support of l2 A seam by 3 times the complement of small-scale jet, only a little plastic deformation, supporting good effect. Contraction of the two largest tunnel wall deformation 110ram, but overall not damaged. Shihmen seam shotcrete support during Kailuan mine is first, the prospects for the future it will be more broad. About Peishou Hui - Male, 1968. Engineer Fuxin Mining Institute in 1988 graduated from the Department of Mining, now in production technology Zhaogezhuang mine worked as head of technology development zone.
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