三峡升船机横梁贝雷架支撑系统荷载试验

Support system load test of beam Bailey truss of Three Gorges Project ship lift

在三峡升船机续建工程中,针对塔柱横梁施工支撑体系复杂的特点,在横梁混凝土浇筑前进行荷载试验。试验选取轴1、轴2横梁及其相应的基础梁贝雷架作为模型,按照1∶1进行荷载原型试验,通过布置监测点以及采用合理的检测频率,完成试验数据的采集与分析。本次试验取得以下成果:得出了各类型杆件在加载过程中的最大应力值;随着加载量的增加,横梁、基础梁贝雷架的挠度变化量慢慢增大,模板及排架立杆高程在下降;随着加载量的增加,横梁、基础梁贝雷架都发生了较小的侧向位移,轴2横梁模板左右方向变化量和排架立杆垂直度左右方向变化量均很小;试验监测数据表明,经加强后的贝雷架杆件加载后的各项参数满足安全要求,技术方案可应用于塔柱横梁施工,保证升船机塔柱横梁施工安全。

During the continued construction of Three Gorges Project ship lift, the loading test experi-ment has been carried out before the pouring work of the beam concrete, which is aimed at the complex charac-teristics of the bracing system of tower column beam construction. The experiment chose axle 1 beam, axle 2 beam and corresponding foundation beams＇ Bailey trusses as models, and the loading prototype test is conduct- ed according to 1 ： 1 ratio scale. Through arranging proper monitoring points and adopting reasonable testing fre-quency, the experiment completed the collection and analyzing of test data. The test results are as follows： The test obtaines the maximum stress of different member bars during the loading procedure. With the increasing of loading capacity, the bending variation of beams and Bailey trusses build up slowly, while altitudes of form- work and framed bent drop. With the increasing of loading capacity, the beams and foundation Bailey trusses ex- perienced subtle side movements. The variation of both the axle 2 beam formwork and the framed bent＇ s vertical- ity from left to right is very tiny. The monitoring data indicates that, the parameters of strengthened Bailey truss-es meet the safety requirements, and the proposal applies to the tower column beam construction while ensuring its safety.