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近几年来,两淮矿区在深冻结井筒内外壁之间铺设塑料板夹层,减少了外壁对内壁的约束,基本上防止了内壁裂缝的产生,达
In recent years, the Lianghuai mining area has laid a sandwich of plastic plates between the inner and outer walls of the deep-freezing wellbore to reduce the restriction of the outer wall to the inner wall and basically prevent the occurrence of cracks in the inner wall.