Measurement and control method in suspension pouring construction process of continuous rigid frame bridge

Abstract

The invention discloses a measurement and control method in a suspension pouring construction process of a continuous rigid frame bridge, and belongs to the technical field of measurement and control of highway engineering. According to the method, a parameter identification step is added based on the prior art. The measurement and control method comprises the steps of obtaining overall rigidities EI1 and EI2 of to-be-identified rigidity beam segments; obtaining weights mL1 and mL2 of to-be-identified weight beam segments; performing identification in a high-order mode under the condition that the identification effect is greatly influenced by test environment conditions or is interfered by other influence factors; and adjusting an elevation of the front end of a hanging basket on site to realize suspended poured line shape control. According to the method, the overall rigidity and the quality are identified, the down-warping amount generated by a to-be-poured beam segment is predicted, and the construction camber is reserved, so that a reasonable completed bridge line shape of the bridge is realized. The method has the main advantages that the temperature influence is avoided and the measurement does not need to be carried out at night, so that the potential safety risk of operation is lowered; software and hardware are mature, data processing is concise, and sensors can be connected for wireless communication, so that unmanned monitoring is realized; and the precision is improved and passive control methods and means are added.

Description

Technical field: [0001] The invention relates to a measurement and control method in the cantilevered construction process of a continuous rigid frame bridge, which belongs to the technical field of measurement and control of highway engineering. Background technique: [0002] The long-span prestressed continuous rigid frame bridge changes with time due to the structural shape, the properties of the concrete material and the load it bears during the construction process. Therefore, it is difficult to identify the structural parameters, which leads to the failure of the elevation control during the construction period, and the large error between the finished bridge alignment and the theoretical alignment of the bridge. The current measurement technology is mainly to use the level and total station to test the elevation and axis, and also use the strain sensor to test the temperature and strain. The results are not very satisfactory, and are greatly affected by the temperatur...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to identify the structural parameters, which leads to the failure of the elevation control during the construction period, and the error of the completed bridge alignment and the theoretical alignment of the bridge is relatively large.

The current measurement technology is mainly to use the level and total station to test the elevation and axis, and also use the strain sensor to test the temperature and strain. The results are not very satisfactory, and are greatly affected by the temperature, and often need to be tested at night. labor intensive

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