Study On Temperature Control Of Anchorage Mass Concrete And Application Of BIM Technology

In recent years,China has been ushered for infrastructure development for a very long time.Infrastructure facilities such as large concrete structures are constantly emerging and play a vital role in the field of modern engineering construction.Due to the hydration of cementitious materials,a large amount of hydration heat is inevitably generated.While the concrete is improperly maintained after pouring,quality problems may occur,and even worse,serious problems may be caused to the safety and durability of the structure.Anchor is the key position of a suspension bridge,whose overall stability and bearing state directly influence the safety and long-term reliability of the bridge.In this thesis,research on the temperature control of anchor based on BIM technology is carried out.(1)This thesis expounds the phenomena,types and hazards of concrete cracks on structural functionality and safety.From the aspects of heat reduction,heat reduction,heat dissipation,reasonable splitting and blockage,and heat preservation and maintenance to describe the measures to prevent temperature cracks.(2)The general structure of anchors,steel bars,cooling water pipes,loose cables and saddles are established through the Revit platform,and the Revit anchor model is established according to the logical relationship of each component.A conversion method from Revit model to finite element model is proposed to complete the conversion from Revit model to finite element model.(3)Based on the theory of concrete heat conduction,the finite element method is used to simulate the mass concrete of anchorage,and the influence of parameters such as cement dosage and ambient temperature on the temperature field of mass concrete is discussed.On the basis of theoretical analysis,according to the characteristics of the anchor structure and the actual process,the corresponding technical recommendations for temperature control are proposed.(4)Based on the BIM technology management project progress,the establishment method of 4D progress management model is seriously elaborated.The Revit model is imported into the Navisworks platform for analysis and processing together with the progress data generated by the Project which TimeLiner can be used to correlate 3D models with time to achieve 4D simulation of the construction process to make rational use of free time difference,so that mass concrete can avoid pouring in high temperature seasons as much as possible.(5)According to the structural characteristics of the anchor,the monitoring scheme ofconcrete hydration heat temperature is formulated.By comparing the measured data of the temperature monitoring parameters with the theoretical calculation values,it is pointed out that the temperature control of the anchor concrete can be realized by preferentially controlling the temperature difference and limiting the peak temperature.Anchorage concrete temperature control can also be achieved by dual temperature control of internal and external temperature difference and peak temperature.