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大跨度管道桁架跨越多采用牵引(顶推)方法施工,但施工荷载和外界因素导致桁架杆件产生复杂的应力状态,因而过程控制对整个施工成败具有关键作用。以境外某管道桁架跨越工程为例,从桥路选择、数据采集系统、施工过程数值模拟计算、传感器选择与安装等方面详细论述了应力应变监控技术在该工程中的应用。监控结果显示桁架最大应力为121 MPa,经现场及时调整牵引速度后,桁架应力稳定在90 MPa以内,与计算值基本吻合。应力应变监控技术能够及时、准确地提供关键结构部位的受力情况,具有较强的可实施性,可以有效保障工程施工的安全。
The construction of long-span pipe trusses often adopts the method of traction (jacking). However, the construction loads and external factors lead to complex stress state of the truss members. Therefore, the process control plays a key role in the success or failure of the whole construction. Taking a pipeline truss project across the country as an example, the application of stress-strain monitoring technology in this project is discussed in detail in terms of bridge selection, data acquisition system, numerical simulation of construction process, sensor selection and installation. The monitoring results show that the maximum stress of the truss is 121 MPa. After adjusting the towing speed in time, the stress of the truss is stable within 90 MPa, which basically agrees with the calculated value. Stress and strain monitoring technology can timely and accurately provide the stress of the key structural parts, with strong implementability, which can effectively protect the safety of construction.