Construction Monitoring Of The Rotatable Prestressed T Type Rigid Frame Bridge And Linear Trends Research

With the rapid growth of our national economy and the investment in the fields of road and rail traffic continued to increase, the construction of the bridge also inseparable being rapid development. There so much Factors may affect bridge construction, including not only technology, tools and environment, but also local topography when the way would pass through existing lines or cross-river, and the bridge construction will face a lot of restrictions.But appearance of swivel construction can have a good solution to the above trouble, since the construction of this construction method have a good adapt to the complex terrain existing lines of communication, and it is safe and efficient in construction process, so swivel construction method has a very broad prospects for application.In this essay,for prestressed concrete T-frame swivel construction of zhengzhou expressway construction Longhai railway bridge across the swivel(70 + 70)m T-shaped rigid frame bridge swivel construction into a linear influence factors research.The main work to be done here include according Zhengzhou Expressway Longhai railway bridge across the structural characteristics and construction various characteristics,Using finite element software for the T rigid frame bridge swivel made a detailed simulation to ensure the structure linear has been in the range of safe and reliable.It can made ample working to enhance the accuracy of the final closure can meet the design requirements which shows that this article accurate understanding of swivel monitor.Then complete weighing test by use of the ball joint rotating unbalanced moment method,get the left and the right pieces of the bridge pieces bridge unbalanced moment and eccentricity by calculating the experimental data and values needed to calculate the weight,Through beam reasonable counterweight to ensure the safety of T frame bridges swivelanalyzed the method of weighing the pros and cons through beam reasonable counterweight to ensure the safety of T frame bridges swivel.This paper also analyzes the impact of prestressing losses and deformation of the ball joint off the shelf main beam linear stage.Firstly consider the prestressing loss theory and to establish different degrees of loss of prestressing finite element model,obtained different bridge levels of the prestressing loss trend and the reason coursed measured and calculated values deflection design differences in landing gear stage.To got the ball joint influence of the deformation of the bridge linear and the ball hinge contact surfaces vertical stress distribution performance from theoretical analysis and modeling of the process deformation of the swivel ball joint,which can provide a guarantee for the structural smooth swivel.This paper also analyzes the influence of temperature on the bridge linear,and proposed the relative bridge formwork elevation method to cut linear temperature influence. Linear beam measured actual degree of compliance with the theoretical linear better after the collapse by using the relative bridgeformwork elevation method to adjustment beam elevation,it can eloquent testimony opposing mold abatement Elevation Method for temperature effects on linear played a significant role.Finally, this paper analyzes the effect of creep to affect body alignment bridge and describes the calculation theoretical of concrete and creep model,by comparing different models to find the most appropriate model selection method and comparing the measured and theoretical values,we can got the conclution that using the creep model method to calculate the elevation of formwork accurate and reasonable,and its accuracy can meet the requirements.