Research on mechanical performance of prefabricated circular working shaft for pipe jacking
In recent years,prefabricated buildings have gradually been widely used in underground pipeline engineering.To study the mechanical performance of prefabricated circular working shafts for pipe jacking,a three-dimensional finite element method was used to analyze the stress of the segment shaft concrete and the connecting bolts for the prefabricated circular working shaft according to the in-situ monitoring of the jacking forces.The results showed that the jacking force can be significantly re-duced by some drag reduction measures such as coating lubricant on the pipe surface and using thixotropic mud for grouting,which can even make the jacking force below 50%of the designed value.With the action of jacking force loaded on the prefabricated working shaft,the bolts were not tensioned obviously.Only the concrete outside of the segmental shaft at the backseat wall was sig-nificantly tensioned,attention should be paid to it during the design,and some reinforcement should be carried out if necessary.Compared to the bonding CFRP reinforcement scheme,bonding steel plate reinforcement scheme had the advantages of higher ma-terial utilization and a more obvious reinforcement effect.The research results can provide a theoretical basis and reference for pro-moting the application of prefabricated buildings in municipal pipeline engineering.
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