Mechanic Analysis For The Concrete Roadded Of CRTSII Slab Track During Construction On The Long Bridge Of Simply Supported Beam

CRTSII slab track is one of the main track structure types used in high-speed railway. Now a complete set of construction method of the concrete roadded has been summarized. But the analysis and demonstration of the rationality of the construction method is next to nothing. This paper has done a systematic research on this construction method for the concrete roadded, summarized the relative research rules and put forward some instructive advices.There are several different connection forms in the construction of the concrete roadded of CRTSII slab track on the long bridge of simply supported beam. The connection forms of newly-built temporary terminal spine-general area-newly-built temporary terminal spine and existing temporary terminal spine-general area-terminal spine are chosen as examples in this paper. Based on the two forms, a track-bridge-pier model is made by great finite element software ANSYS to analyze the force condition of the concrete roadded during the construction when its temperature is lower than the neutral temperature. When the plate temperature increases to the neutral temperature, the variation of the concrete roadded force can be analyzed. Meanwhile, there are some differences in the link of KO of newly-built temporary terminal spine and BL1of general area in the construction of the concrete roadded, the effects of the different link forms on the concrete roadded force is analyzed in this paper. Finally, the influences of the factors such as the tension method of the post poured strip, the temperature of the concrete roadded, the friction coefficient of sliding layer, the pier stiffness, the length of the general area, the construction method of the concrete roadded on the concrete roadded force during the construction are analyzed specifically.The main conclusions are as follows. When the temperature of the concrete roadded is lower than the neutral temperature, the force increases gradually as the construction goes on. The exaggerated tensile force will lead to the cracking of the concrete roadded concrete. Therefore, to keep the concrete from cracking, the temperature of the concrete roadded cannot be too low in construction. The force is not zero when the plate temperature increases to the neutral temperature. It is better for the concrete roadded to link the KO of newly-built temporary terminal spine and BLl of general area in the construction. When the tension distance of the post poured strip is reached by several times, the force of the concrete roadded will be smaller. Also, the force of the concrete roadded is smaller if the friction coefficient of sliding layer, the pier stiffness and the length of the general area are smaller. What’s more, the higher temperature of the concrete roadded makes the force of the concrete roadded smaller, which is more beneficial to the construction of foundation plate.