泵站进水流道施工期钢模板变形监测研究

Deformation monitoring of steel templates for suction boxes of pumping stations during construction

在泵站施工过程中,加强对进水流道钢模板的变形监测对保障泵站安全施工具有重要意义。针对传统变形监测方法难以适用于复杂异型曲面和易受环境因素制约等不足,基于预泵浦布里渊光时域分析技术对泵站流道施工期钢模板进行变形监测,提出一种温度补偿方法以解决布里渊频移对温度和应变交叉敏感的问题,采用改进共轭梁法将温度补偿后的应变监测值转换为结构变形。将该方法成功应用于某排水泵站工程流道钢模板变形监测。监测结果表明,钢模板顶部和两侧均监测到拉应变,拉应变随混凝土浇筑逐渐增加,并在浇筑完成一段时间后趋于稳定。该监测方法对异形结构变形监测的研究和应用具有借鉴意义。

During the construction of a pumping station,the deformation monitoring of the steel template for its suction boxes is of great importance to guaranteeing the safe operation of pumps.Pulse-prepump Brillouin optical time domain analysis(PPP-BOTDA)method is applied for the pump deformation monitoring to overcome the shortcomings of traditional methods with regard to poor adaptability to complicated shaped surfaces and the constraints of environmental factors.A temperature compensation method is proposed to solve the problem that the Brillouin frequency shift is sensitive to both temperature and strain.An improved conjugated beam method is then adopted to convert the strain after removing the temperature effect to structural deformation.The method is successfully applied to the deformation monitoring of steel templates for suction boxes of a drainage pumping station.The results show that tensile strain and deformation occurred on the top and both sides of the steel templates,and increased during concrete pouring and stabilized after completion.The feasibility and superiority of the proposed method is validated,which provides an important reference for the research and application of structural deformation monitoring.