According to geological condition of this mined-out area, a three hole-ins well has designed to carry out surface grouting and fire-area sealing.
根据该采空区地质条件，设计了三开井身结构，对采空区进行地面注浆及封堵处理。
Carry out surface preparation by grinder and dust free self-enclosed portable grinder until to remove surface laitance and provide sound and textured surface.
使用地坪打磨机和无尘封闭手提磨机去除表面粗糙物，并提供涂装对表面所要求的粗糙度。
Carry out surface preparation by grinder and dust free self-enclosed portable grinder until to remove surface laitance and provide sound and textured surface.
使用地坪打磨机和无尘封闭手提磨机去除表面粗糙物，并提供涂装对表面所要求的粗糙度。
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