新型脚手架施工方案防火安全性

Fire safety of new scaffold construction scheme

提出钢材踏板与竹枋踏板间隔布置的新型脚手架,针对传统脚手架、新型脚手架两种施工方案分别设计火灾场景,从温度和热流量两方面进行数值模拟分析。结果表明,传统脚手架施工方案中,距离着火层1.8m处的踏板在模拟时间400s内最高温度超过300℃,热流量超过16kW/m2;新型脚手架施工方案中,距离着火层3.6 m处的踏板在模拟时间400s内最高温度低于250℃,热流量低于5kW/m2。根据相关判据,传统脚手架被点燃的风险较高,而新型脚手架被点燃的风险较低。新型脚手架施工方案由于采用了不燃的钢材踏板作为阻隔,有效地降低了火灾在竖向的蔓延风险,较传统脚手架施工方案有更好的防火安全性。

A new type of scaffold with bamboo separated by steel was proposed, and aiming at the traditional scaffold construc- tion scheme and the new scaffold construction scheme, two fire scenarios were designed to simulate the temperature and heat flux. The simulation results showed that maximum temperature of the scaffold boards at 1.8 m from the fire floor in the tradi- tional scaffold construction scheme exceeded 300 ℃, and heat flux were more than 16 kW/m2 in the simulation time of 400 s. In the new scaffold construction scheme, the maximum temper ature of scaffold boards 3. 6 m from. the fire floor was lower than 250 ℃ in simulation time of 400 s, and the heat flux was lower than 5 kW/m2. According to relevant criterion, the risk of being ignited of traditional scaffold was higher, and that of new scaffold was lower. Due to a non-combustible steel fence scaffold boards as a barrier, the new scaffold construction scheme had reduced the risk of fire spread in vertical. The new scaffold construction scheme had better fire safety than tradi- tional scaffold construction scheme.