Research On Sleeve Connection Technology And Application Of Assembled Integral Shear Wall Structure

The construction industry is an important part of China's economic development and the basis of China's rapid economic development.However,with the blowout development of the construction industry,energy consumption and environmental pollution problems have gradually become apparent.About one third of the country's energy is consumed by the construction industry every year,and the construction waste generated pollutes the urban environment.According to statistics,the energy consumption of prefabricated buildings is only one third that of ordinary cast-in-situ structures,construction materials can be saved by 20%,construction water consumption can be saved by 40%,and construction waste can be reduced by about half.In terms of energy consumption,the significance of prefabricated buildings for environmental protection can be seen.At the same time,prefabricated buildings also have the advantages of saving labor and changing labor conditions,effectively shortening the construction period,and facilitating winter construction.The assembled integral shear wall structure is currently one of the most widely used assembled building structures in the country.The vertical connection method is generally connected by sleeve grouting.The key point of prefabricated structure is the control of structural connection nodes,so researching the sleeve grouting connection of prefabricated building is of great significance to the development of prefabricated building.The main research object of this article is the full grouting sleeve connection.Firstly,the development of prefabricated building in China and the current research status of sleeve grouting connection technology at home and abroad are reviewed.Then the production process and installation process of precast shear wall panels are introduced.And proposed solutions to the problems of sleeve connection;then introduced the types and connection technologies of common sleeves and the connection mechanism of grouting sleeves,and used ANSYS software to simulate the grouting sleeves with three different shear keys,analyzed the influence of different shapes of the shear key on the inner surface of the sleeve on the grouting connection performance of the sleeve.Finally,a new type of sleeve is subjected to the grouting connection loading test.Based on the test results,it is determined whether the specifications are met.Thecylinder was numerically simulated,and the simulation results were compared with the experimental results.At the same time,this type of sleeve was compared with the other three types of sleeves with different shear keys.The main findings are as follows:(1)make the limit position of the staying of ribs,for example,pre-preparing wooden blocks and insulation board pads at the positions of staying ribs,or installing a limit device on the mold can effectively solve the problem of the vertical sleeve connecting the steel bars.Bending the PVC pipe covering the slurry outlet with the opening facing up on the slurry outlet can effectively solve the problem of insufficient grouting caused by grouting backflow;it is proposed to change the form of the limit key and limit baffle in the sleeve to Solve the problem of broken key;propose a three-dimensional steel frame to solve the problem of insufficient storage space for components.(2)Residual deformation of three different shapes of shear key sleeves and new sleeves after unidirectional stretching and repeated high-stress tension and compression all meet the requirements for connection performance of joints in the deformation performance of joints.In unidirectional stretching,the residual deformation of the rectangular shear key sleeve connector is the smallest,the conical shape is the second,and the arc shape is the largest.In the repeated tension and compression that best reflects the actual working conditions,the residual deformation values of the rectangular shear key sleeve connector and the tapered shear key sleeve connector are very close to each other,which are less than the arc-shaped shear key sleeve connection.The residual deformation of the piece.Under maximum tensile tension,the displacement and stress values of the rectangular shear key and the conical shear key are also very close;the maximum stress value of the sleeve is located at the joint of the slurry hole and the cylinder wall.(3)The simulation values of the connection performance between the new sleeve and the other three types of shear key sleeves are similar.According to the results of unidirectional tensile simulation,the residual deformation value of the new sleeve connector is smaller than that of the other three types of shear key sleeve connectors;from the high stress repeated tension and compression simulation results closer to the actual working conditions,the new sleeve The residual deformation of the connecting piece is greater than the other three sleeves.According to the simulation results under the maximum tensile force,the displacement value of the new sleeve is smaller than that of the other three sleeves,and the stress value is larger than that of the other three sleeves.The maximum stress of the new sleeve is at the groove of the cylinder wall.(4)The comparison between the simulation value of the new sleeve and the test value shows that the residual deformation test value of unidirectional tension is greatlydifferent from the simulated value,mainly because the actual measurement value of uniaxial tension is very small and it is difficult to measure accurately,resulting in the difference of numerical reading.The test value of repeated tension and compression is close to the simulation value,which indicates that the numerical simulation can simulate the residual deformation of the sleeve connector well,and also proves the reliability of the numerical simulation.