摘要
大风易导致混凝土垂直运输机械振荡,增大缆机运输作业对仓面作业的影响范围,提高大坝浇筑空间冲突频率,造成安全事故。为刻画风力作用下的大坝浇筑空间冲突频率,本文分析风力对吊罐运行影响,构建吊罐事故工况下坠落运动方程,界定吊罐坠落的影响空间;根据浇筑仓面尺寸,剖析仓面机械物理工作空间变化规律;提出交叉作业时间重叠的循环网络仿真方法,确定吊罐影响空间和仓面机械工作空间的重叠时间;结合不同风速出现的频率,采用联合概率表征风力作用下的大坝浇筑空间冲突频率。实证表明:本文提出的模型可有效预测和量化风力作用下的大坝浇筑空间冲突频率;相较于未考虑风力的情景,风力作用下的大坝浇筑空间冲突频率明显增大。
Winds often trigger oscillations of vertical concrete transport machinery, which enlarges the impact space of a cable crane on dam block surface operation and raises the frequency of space conflicts, enhancing the potential of accidents. High conflict frequency in cross operation space under wind loads is a major root of construction accidents during dam concrete pouring. This study explores the wind influence on the operation of a bucket, and constructs an equation for its falling motion under the accident condition. And based on this, we explicitly calculate the impact space of a falling bucket, and analyze the variations in the physical working space of the machines according to the size of dam block surface. Besides, we present a new cyclic network method for simulating cross operation overlapping time and determining the conflict frequency between impact space and working space. A joint probability with the occurrence frequency of different wind speeds is used to characterize the space conflict frequency of three-dimensional cross operation. Comparison with filed data shows that our new model can effectively quantify and predict the space conflict frequency of concrete pouring under various wind loads, thereby being useful for improving dam construction safety management.
作者
陈述
田亚
袁越
CHEN Shu;TIAN Ya;YUAN Yue(College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002;Standardization Evaluation Center for Production Safety,China Three Gorges University,Yichang,Hubei 443002)
出处
《水力发电学报》
EI
CSCD
北大核心
2020年第5期27-35,共9页
Journal of Hydroelectric Engineering
基金
国家自然科学基金(51609128)
关键词
水利工程施工
空间冲突频率
施工安全管理
大坝浇筑
风力
hydro project construction
space conflict frequency
construction safety management
dam construction
wind loads
