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Settlement Observation of Construction Moulding of Cast Concrete Box Girder

Settlement Observation of Construction Moulding of Cast Concrete Box Girder

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[Abstract]:
According to the characteristics of the moving formwork and the pouring box girder

According to the characteristics of the moving formwork and the pouring box girder, the deformation of the main beam, the bottom mold, the wing plate and the formwork leg are observed. The number of measuring points will be arranged according to different spans and different structural forms. The observation process should run through the whole process of pre-pressing the mold frame, and the process should be unified and unified. The deformation of the formwork is measured by steel ruler, accurate to mm, and the position of the front and rear feet should be consistent during the observation process. 1 Initial state observation After the completion of the observation point layout, the initial reading of each observation point is observed and recorded. 2 Observation of the observation loading process during the loading process: The loading process simulates the unfavorable stress state of the construction process. The loading process is divided into four levels. Each time the loading is completed, the observation points are observed and recorded, and the observation is observed. Throughout the loading process, you find that the exception should stop loading immediately, and the reason is processed. 3 After the continuous load observation is completed, the load is observed for 24 hours, and it is observed every hour, and the record is made. If the settlement changes are relatively large, the load should be continued. Continue to observe for 48 hours, record once every hour, and make a record. If an abnormality is found, it should be reported in time for emergency treatment. Emergency treatment measures: a temporary support pier is set up with Bailey tablets in the 40m span. The distance between the pier top and the moving formwork steel beam is controlled by 20cm. If abnormalities are found, the sleepers and the wooden hinges are tight, so that the temporary support piers can play a role. 4 Unloading observation The unloading observation is an important part of “loading preloading”. The unloading observation of the load of each stage can be used to calculate the elastic deformation and residual deformation of the moving formwork under various loads, and each level is completed during unloading. The unloading is to be observed and completed, and the first stage load is removed. 5 Summary of the pre-pressing process The safety and reliability of the moving formwork during the use process are evaluated. The residual deformation and elastic deformation of the observation points of each observation section are calculated at each construction stage. The determination of the elevation value of the mid-span is to strengthen the part with insufficient local stiffness. Primary load. 5 Summary of the pre-pressing process The safety and reliability of the moving formwork during the use process are evaluated. The residual deformation and elastic deformation of the observation points of each observation section are calculated at each construction stage. The determination of the elevation value of the mid-span is to strengthen the part with insufficient local stiffness.