Research On Construction Deviation Transfer Rule And Application Of Steel Spring Floating Plate Rrail Foundation

Steel spring floating slabs are widely used in urban railway projects as a special form of monolithic roadbed.The steel spring floating plate will produce deviation during the construction process,and the construction deviation will lead to the change of the floating plate structure size which will affect the subsequent construction.At present,the research on steel spring floating plate is mainly focused on improving the accuracy of mechanical equipment,but the research on the transmission law of construction deviation of under-rail foundation is less.There is an urgent need to study the transmission law of construction deviation and propose a suitable correction plan according to the law to provide guidance for the subsequent construction.In this thesis,we study the construction deviation of steel spring floating plates in underpass tunnels,establish the deviation transmission law by using mathematical methods,consider different deviation combination conditions,and propose various correction schemes.ABAQUS is used to establish the finite element model of the floating plate to analyze the vibration damping performance of different working conditions,and to calculate the economic index to compare the cost-efficiency ratio of each solution,so as to select the suitable solution.The main conclusions are as follows:(1)The deviations generated during the construction process are mainly caused by the tunnel centerline offset,substrate thickness deviation and floating plate thickness deviation.The deviation transfer is non-linear and consistent with the characteristics of continuous deviation flow,i.e.the deviation will be transferred from one link to the next.(2)When the tunnel centerline deviation,the base thickness and floating plate thickness should be controlled at 175-281 mm and 278-325 mm respectively.the peak vibration response of the rail within the range of base thickness deviation is mainly concentrated in 12.5 Hz;the vibration damping performance is most affected when the base thickness increases by 65 mm,and the vibration damping performance decreases by 23.90%.The peak vibration response of the rail within the deviation of floating plate thickness is concentrated in 3.15 Hz;when the thickness of floating plate is reduced by 45 mm,the vibration damping performance is affected most,and the vibration damping performance is reduced by 24.24%.Therefore,from the vibration damping performance point of view,in the floating plate construction process,the floating plate thickness deviation should be controlled as a priority.(3)The economy of deviation correction is influenced by the effect and cost of deviation correction,and two schemes of single deviation correction and multiple deviation correction are proposed according to the law of deviation transmission.From the economic point of view,in the actual construction process,if the construction deviation is small,a single correction plan can be adopted;if the construction deviation is large or the construction situation is complicated,multiple correction plans can be adopted.