Construction Technology of Prefabricated Canopy at Tunnel Portal
The prefabricated canopy precast members at the tunnel portal of section 1 of the second phase of Jinxing Railway include precast columns,precast beams and precast slabs,all of which are produced according to factory standards.This paper introduces the construction process of prefabricated canopy at tunnel portal,describes the construction preparation,column base positioning device installation,precast columns hoisting,precast beams hoisting,precast superimposed slabs hoisting,concrete pouring on the superimposed surface,check and acceptance.This paper analyzes the selection of spreaders and the layout of hoisting points of different precast members,and proposes construction quality control measures.
tunnelscanopiesconcreteprefabricationprecast members
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