Monitoring and control of steel truss arch bridge jacking construction

Abstract

Through the real-time monitoring of the internal force, alignment and suspender force in the process of bridge jacking construction, the measured data and theoretical calculation values obtained from the monitoring are compared and analyzed, and it is found that the measured data are in good agreement with the theoretical calculation values. The results show that through the analysis of the real-time monitoring data of the jacking process of the bridge, the measured stress values of the main beam are within the range of –40.79 MPa ~25.13 MPa, and the measured stress of the main arch is within –40.33 MPa ~16.06 MPa, which does not exceed the allowable stress range of the steel in the jacking process, and the structure is safe. The measured elevation of the line is in good agreement with the theoretical elevation, and the deviation is mostly less than 5 mm, and the maximum deviation does not exceed the limit value of 8mm. The difference between the measured cable force and the designed cable force in the stage of removing the temporary pier is very small, which does not exceed ±5% and meets the requirements of the specification. The research in this paper can provide a reference for the jacking construction of similar bridges.

Keywords

• steel truss arch bridge
• incremental launching construction
• construction monitoring