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山东省七五煤矿风井改造工程中需要在原风井井颈部位开凿风道口 ,风道口断面高 5 0 0 0ｍｍ ,宽 44 0 0ｍｍ。风井井壁内层为混凝土结构 ,厚 3 0 0ｍｍ ;中层为钢筋混凝土结构 ,厚60 0ｍｍ ;外层为料石砌成 ,厚 3 0 0ｍｍ ;井壁总厚为 12 0 0ｍｍ ;风井内直径为 60 0 0ｍｍ。1?
Shandong Seventy-five coal mine shaft reconstruction project needs to be in the original part of the air shaft well-neck excavation, the cross-section of the air duct surface high 5 0 0mm, width 44 0 0mm. The inner layer of the shaft wall of the wind shaft is a concrete structure with a thickness of 300 mm; the middle layer is a reinforced concrete structure with a thickness of 60 mm; the outer layer is made of a stone material with a thickness of 300 mm; the total wall thickness of the shaft wall is 120 mm; Is 60 0 0mm. 1?