隧道结构的特殊性——狭小而又相对封闭，造成了隧道火灾不同于地上建筑火灾的一些特点。
As the tunnel structure has some particularities, narrow and comparatively close, there are many differences between the tunnel fires and the building fires.
城市隧道内一旦发生火灾，封闭狭长的特殊环境，将造成无法估量的灾难。
Once the fire is in the urban tunnel, due to the closed, narrow and long special circumstances, it would result in incalculable disaster.
第三十九条建筑施工企业应当在施工现场采取维护安全、防范危险、预防火灾等措施；有条件的，应当对施工现场实行封闭管理。
Article 39 the construction enterprises shall take measures aimed at maintaining safety, preventing dangers and fires. When condition allows, the construction site shall be sealed up.
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