Construction Monitoring And Control Method Of Cable-Stayed Bridge Construct With Prestressed Concrete On Scaffold

The cable-stayed bridge occupies an important position in the city bridges because of its excellent bridging capacity and beautiful shape. Researches concerning the monitoring of cable-stayed bridge construction are increasingly valued. This paper takes the Lingfeng Bridge of He Zhou City in Guangxi Autonomous Region as an example and analyzes the construction monitoring methods of full-framing construction cable-stayed bridge, focusing on the detailed introduction and research of the following content:1. To reduce the differences between real structures and models caused by various errors, the sensitivity of design parameters is recognized. Least square method is used to recognize and correct the measured data so that the model calculation will be more close to the real situation.2. In cable-stayed bridge of stent construction, the confirmation of camber of main beams needs to consider the deformation influence of timbering measured by pre-pressing of top bar in addition to the influence of later-period construction. The change of internal force of stay cable as the main load component has a great influence over the state. Therefore, the monitoring of stay cable’s stretch-draw force is of great importance. It requires making a pre-measurement of the stretch-draw force of cable tension before stretch-drawing, doing real-time monitoring of bridge’s linear shape and stress during stretch-drawing and measuring real state of bridge after stretch-drawing to analyze the influence of later-stage construction.3. When adopting matrix method to adjusting cable, the influences of cable force changes over the linear shape, internal force and supports’ counter-force are considered. The obtained multidimensional contradiction equation is put into model and gets checked and adjusted after numerical analysis and linear matching.Through theoretical analysis and practical application, the feasibility of content and methods of construction monitoring of support constructed cable-stayed bridge used in this paper is verified.