CONSTRUCTION METHOD OF A CONTINUOUS BRIDGE USING AN ASSEMBLED GIRDER WITH PRESTRESS

摘要

Guarantee stability is provided in the connection of purlin using a construction method of a continuous bridge of the purlin of a prestressed prefabricated components, by the purlin of installation being connected and being stretched and compression stiffening plate in connection installation in the purlin of adjacent and harbour support installation prefabricated components. A construction method using a continuous bridge of the purlin of a prestressed prefabricated components includes the following steps:: the purlin of one prefabricated components of manufacture has an I-girder (10) for upward arc by preparation, on upward arc, it manufactures main prestress and passes through the center girder load applied downwards, one reinforcing bar is set in a lower flange and a sheath handle is installed, places lower casing specifically with specific and removal downward load; The end carriage that manufacture is placed in an adjacent support has a lower flange and a upper flange,No lower casing specifically passes through installation equipped with cast anchor blind alley and a sheath handle,It is connected to casting anchor on one end of the purlin with concrete,Installation is specifically connected to the lower casing to the dead end of a part of lower flange,Manufacture the end carriage being placed in a harbour support when with the connection of an end carriage of another purlin being placed in harbour support has stretching on lower edges with compression steel plate appendage length to minimize negative moment,Its by the both ends from purlin in a certain distance installation equipped with cast anchor blind alley and sheath handle to inside,Manufacture,It is connected to the dead end and manufactures the lower casing specifically installed to lower flange and connection,Assembly one does not use center girder specifically with the lower casing that it terminates,Connection is placed on end carriage and end carriage on adjacent,It is placed on the harbour to the other end of one end He the center girder for being manufactured to main prestress,Specifically to the casting concrete and lower casing in the space between lower flange,The PS lines that penetrate to cast anchor are connected to enter the installation of sheath handle to the both ends of assembled girder and cast anchor to the dead end at both ends,Pulling force is applied to PS lines and fixation,It casts anchor to secondary prestress of casting anchor to entire assembled girder; Purlin overpass bearing and the harbour support for continuously placing the prefabricated components of adjacent support, form connection, the purlin of prefabricated components neighboringly connect the place to harbour support with purlin, places and treat a top slab on purlin.