Research on the effect of the common flame retardant in reducing the flammability of the bitumen

The bituminous defect that the binder is flammable will bring road safety risk.Once it catches fires,large quantities of heat,smoke and poisonous gas are produced,released and spread quickly,which seriously hinder escape and rescue and harms heavily traffic safety.The common flame retardant system is used to modify the asphalt.Cone Calorimeter is adopted to evaluate the burning property of asphalt.The performance of the flame retardant is evaluated by limiting oxygen index and orthogonal design method.The paper analyzes the synergism of the asphalt and flame-retardant,and analyzes the effect of the flame on preventing the smoke to spread and demonstrates that the use of common flame retardants which is added into binder is good at reducing the flammability of the binder.This way can increase the safety of asphalt pavement when fire occurs in the tunnel.The study suggests that flame retardancy of asphalt can be evaluated by Limit Oxygen Index (LOI) and the flame retardancy property of asphalt has marked change according to the content of flame retardant.SB has perfect flame retardancy property,and ATH is better than MH in the effect of flame retardant.     

一起人员坠入电梯井道事故的反思

2005年初，福州某酒店内一正常运行中的电梯3楼层门门扇受外力作用，引起下端滑块脱出地坎滑槽，致使一酒后男子从该门扇位置坠落井道死亡。经现场勘察发现，该门扇表面及门扇下端滑块未出现明显变形，滑块脱出地坎滑槽并朝井道内靠在地坎边上，整个门扇仍悬挂在层门导轨上，层门电气机械联锁装置有错位变形。事故发生后特种设备监督检验机构组织人员对该事故进行调查分析，认为3楼该层门是在受到外力的作用下，使门扇发生弹性变形，导致门扇下端滑块脱出层门地坎滑槽。最终使3楼层门失去封闭井道口的作用（防坠落保护功能失效）。