Research On Completed Status Of The Bridge And Construction Control Of Shang-di Cable Stayed Bridge

The cable-stayed bridge is a kind of the bridge which main beam is under compression, bridge tower is under compression and stay cables pass load. In1956, the Stroemsund Bridge built in Sweden, which is the world’s first modern cable-stayed bridge. Subsequent cable-stayed bridge construction has been an unprecedented development, and now the cable-stayed bridge is toward a more beautiful shape, more reasonable in the force and span greater directionBecause of the beautiful shape, variety of design and good mechanical performance on reasonable bridge state, cable-stayed bridge is more and more popular for all owners and designers, and now cable-stayed bridge is one of the most competitive bridge structure within the span range of300～1000m, there may be construct a large span cable-stayed bridge at the soft soil of the river estuary and the area where is not suitable for the construction of suspension bridges. Its main span is reach to1088m for China’s Su-Tong Yangtze River Highway Bridge, which is the longest span cable-stayed bridge in the world today, this bridge is the longest continuous length in the twin towers cable-stayed bridge, the bridge also has the world’s longest cable-stayed.First this paper introduces the engineering background of this bridge. This bridge cross the existing Beijing-Baotou railway, suburban railway10Line and Jing Zhang intercity railway, and the construction environment is very complex. B-segment main beam build by the pushing construction techniques and the tower build by climb mold construction process.Followed this paper expositions and analysis the calculation method of the current cable-stayed reasonable completed status of the bridge and reasonable construction status, as well as the advantages and limitations of these methods by a very detailed.Then with the Midas structure calculation software simulation on the cable-stayed bridge, come to the main control parameters of the bridge in the reasonable completed status of the bridge and reasonable construction status. The parameters measured by the construction of early error analysis and adjusted so that the structure of the measured data and calculation of the model output data is consistent and with the calculation of the model output data Guide the construction.Finally, combined with the actual situation of the bridge, put forward the specilifc construction control program of shangdi-cable-stayed bridge, including construction control objectives, construction control content, concrete construction control methods and construction control accuracy.Optical fiber sensing technology is a cutting-edge monitoring technology developed in recent years. Because it has the advantage of small size, light weight, laying quick and easy installation, long life, anti-electromagnetic interference, waterproof, corrosion resistance, etc. Optical fiber sensing technology has been widely applied in the monitoring of the bridge.On the shangdi-cable-stayed bridge monitoring system uses advanced fiber bragg grating sensors, which makes the monitoring work more smoothly and accurately. The results can be seen from the actual measurement that fiber bragg grating sensor get an accurate measurement results, making the bridge alignment and internal forces have reached a good level.