某石灰岩矿石破碎站防护结构设计研究

DESIGN STUDY ON A PROTECTING STRUCTURE FOR A LIMESTONE CRUSHER

为使某已投入使用的紧邻石灰岩采石场的矿石破碎站免遭坠落矿石的破坏,需要为该破碎站设计和建造防护结构。采用方钢管混凝土柱和钢支撑作为防护结构的竖向结构,双向钢-混凝土组合梁板作为屋盖结构,通过对不同方案的分析比较,确定在屋盖结构上铺设土+钢板+土作为吸收坠石冲击能量的缓冲层和防护层。采用通用软件ANSYS/LS-DYNA进行屋盖抗坠石撞击模拟计算分析,采用SAP 2000进行整体结构计算。结果表明,该防护结构达到抵抗体积为1 m3、坠落高度为160 m的坠石撞击的要求。提出的防护结构可以作为一般工业和民用建筑抗坠落重物冲击设计参考。

To protect an in service limestone crusher at the quarry side from damage due to impact of the flying rocks, a protecting structure needs to be designed and constructed. Concrete-filled square steel tube columns and steel braces were used as the vertical structure system for the protecting structure. A two-way steel-concrete composite slab-on-girder system was used as the roof structure. After performing comparison analyses, a layer composed of （soil-steel plate-soil） was used to absorb the impact energy of the flying rocks and to act as a buffer layer and a protecting layer on the roof top. Simulation analyses of responses for the roof impacted by the flying rocks were performed using the general software ANSYSLS-DYNA and the analysis of the whole structure was performed using the software SAP 2000. The results show that the proposed structure achieves the requirement of resisting the impact of the flying rocks with the maximum volume of 1 m^3 and the maximum falling height of 160 m. The proposed protecting structure in this paper can be a reference for common industrial buildings and civil buildings to resist the falling objects from high altitude.