电缆穿过防护管后，应用麻袋条缠绕堵严，以防损坏电缆；
When cables penetrate the protective tube, jute bag shall be applied for winding and blocking in case of cable damaging.
除进风口以外，如有漏气孔隙，应当堵严，如贴胶布，塞棉花，贴胶水纸等。
In addition to outside air inlet, where gas leakage pores, it should be blocked strict, such as patching, plug of cotton and paste glue paper.
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