The Construction Technology Study Of Tensile Pedestal For 1500t Pre-Tensioned Prestressed Beam

Inerement of tensile force for pre-tensioned method pre-stressed components will pose positive effect to lower the cost of high-pile beam-type wharf construction.It could decrease the sectional size of beams,increase the space between pile foundation racks,reduce the quantity of preformed parts and pile foundation,shorten the construction period so as to lower the total cost significantly.On the basis of market development and demands of owners,large-tonnage pre-tensioned method pre-stressed components will be a trend for future designs.The pre-stressed tensile pedestal is the primary force-bearing structure.Adequate strength,rigidity and stability of pre-stressed tensile pedestal are compulsory to ensure the pre-tensioned method pre-stressed components’ quality and operation safety in the duration of casting.So it is necessary starting relative research on the technology of large-tonnage tensile pedestal along with this trend.In this thesis,the author made his study on a serial process containing structural selection,mechanical principle,finite element model calculation,displacement and stress test of application,numerical calculation and field testing contrast etc.to the 1500t pre-tensioned pre-stress pedestal of Xinhui Precast Factory,The Second Engineering Company Of CCCC Fourth Harbor Engineering Co.Ltd.The Pre-tensioned pre-stressed pedestal is located in the on offshore soft ground,the pedestal built with the buried pressure column and pile foundation,and with features of large-tonnage tensile force,large structure weight and complex force.Taking various factors,such as mutual constraints between components,piles and piles side soil resist the force together effect to the whole structure stress by the structural rigidity into account,this thesis utilizes the finite element method to calculate the overall structure modeling for pre-stressed pedestal to make the results closer to actual field situation.This thesis indicates the stress and deformation distribution of various parts of pre-stressed pedestal structure under the most unfavorable load clearly.Designers will have a comprehensive understanding to the whole structure and local stress situation,and correspondingly put forward targeted technical measures to optimize the structural design of pre-stressed pedestal.Finally,it evaluates th e numerical calculation of pre-stressed pedestal and safety performance in normal conditions through field testing data.