超高层建筑雨水立管消能措施对87斗系统的影响

Impact of Rainwater Riser Energy Dissipation Solutions on 87-type Roof Outlet Rainwater System in Super High-rise Building

工程上,超高层建筑塔楼屋面一般采用87型雨水斗系统,并会对雨水立管设置π型弯、横管折转、立管扩径等常规消能措施,以期达到减压、消能的目的。运用数值模拟技术,针对采用常规消能措施的立管系统,以水气比、流速、动水压、速度水头等作为考察指标,分析其实际消能效果及可能存在的问题。100 m高平台模拟试验结果表明,与无消能措施系统相比,采用π型弯和横管折转措施不但不能减压和消能,反而会增加系统的流速和压力波动峰值;而采用立管扩径措施时,在流速峰值指标方面略有降低,但在动水压指标方面其效果不如无消能措施系统。

In super high-rise buildings,the 87-type roof outlet rainwater system is generally adopted on the roof,and conventional energy dissipation measures such asπ-shaped bend,horizontal pipe turning and riser diameter expansion are set for the rainwater riser to achieve decompression and energy dissipation.This paper investigated the changes of indexes such as water-air ratio,flow rate,hydrodynamic pressure and velocity head of the riser system with conventional energy dissipation measures though numerical simulation technology,so as to analyze its actual energy dissipation performance and possible problems.The simulation results of the platform with height of 100 meters showed that compared with the system without energy dissipation measures,the system withπ-shaped bend and horizontal pipe turning could not reduce pressure and energy dissipation,but increased the flow rate and pressure fluctuation peak.In the system with riser diameter expansion,the peak velocity decreased slightly,but its performance in terms of dynamic water pressure was not as good as that of the system without energy dissipation measures.