碗扣式钢管脚手架位移监测系统研制及预警值确定  

Research on Displacement Monitoring System of Tubular Steel Scaffold with Cuplok Joint and Determination of Threshold Value

作　　者：郭佳[1] 何铭华[2] 殷治宁 蔡曙日[1] 刘京[1] 

机构地区：[1]交通运输部公路科学研究院,北京100088 [2]清华大学土木工程系,北京100084 [3]安徽省交通建设工程质量监督局,安徽合肥230051

出　　处：《公路工程》2014年第6期316-320,共5页Highway Engineering

摘　　要：为有效防范施工中的钢管脚手架倒塌,最大限度地减小人员伤亡和财产损失,介绍一种新型碗扣式钢管脚手架位移监测系统的研制原理及组成。以马鞍山长江公路大桥施工中的碗扣式脚手架为实际工程背景,为临时支撑40 m跨度整体式箱梁的钢管脚手架设置施工过程中的位移监控系统。通过提取脚手架临时结构的第一阶屈曲模态,考虑初始缺陷的影响,进行几何非线性全过程分析和设计荷载位移计算,给出碗扣式钢管脚手架位移监测系统所需分级预警值。通过在碗扣式钢管脚手架关键部位布设激光发射器,求取激光发射器所发射激光投射在固定参考坐标系内轨迹的变化,获得碗扣式钢管脚手架关键部位的水平方向和竖直方向位移,该系统可通过无线网络将信号传递至管控中心的PC终端。研究表明,新型碗扣式钢管脚手架位移监测系统为支架工程的倒塌预警工作提供了一种可行的方案,且具有操作简单、成本可控之优点。In case of tubular steel scaffold collapse under construction, a new displacement monitoring system of tubular steel scaffold with cuplok joint is introduced to minimize casualties and property losses. The tubular steel scaffold of a 40 meters long box girder in Maanshan Yangtze River Bridge is taken as an example to propagate structural geometry nonlinear analysis and displacement calculation under design load through scaling and superimposing the lowest eighenmode onto the perfect geometry to create an initial imperfection for displacement graded threshold value. Laser transmitters which are placed in key positions of the tubular steel scaffold are used for trajectory tracking to obtain horizontal and vertical displacements by the reference coordinate system. System signals are transmitted through wireless network to PC terminal in control center. It is shown that the new displacement monitoring system of tubular steel scaffold with cuplok joint is practical and feasible with simple operation and controllable costance.

关 键 词：碗扣式 脚手架 施工预警 监测 激光发射器 

分 类 号：U445.469[建筑科学—桥梁与隧道工程]