DISTORTION SUPPRESSING METHOD OF PRECAST GIRDER AND JOINING METHOD OF PRECAST GIRDER

Japanese Patent JP2016040447

A

PROBLEM TO BE SOLVED: To shorten a construction period by reducing a work amount in a construction site of a bridge, and to join precast girders having bridge-girder divided shapes in a state that distortion is suppressed.SOLUTION: Precast girders 11, 12 which are obtained by dividing a one-span box girder in an axial line direction substantially in a center between webs are manufactured. In the precast girder having a cross section which is asymmetric, and in which a clearance between an upper floor plate and a lower floor plate at one side is opened, a tensioning material 14 is arranged in the vicinity of a side edge which is joined to the other precast girder, and the precast girder is arranged so that an upward reaction component from the tensioning material acts on the vicinity of the side edge in the vicinity of a center in an axial line direction when the girder is supported at its both ends. Furthermore, prestress is introduced in advance to the vicinity of a tip of a hang-out part 5a of the upper floor plate, and the vicinity of a joining part between the webs 6 and the lower floor plate 7. These two precast girders are supported at their both ends, concrete is placed between the precast girders, and the integrated box girder is formed.SELECTED DRAWING: Figure 4

KASUGA AKIO
TAIRA YOSHIHIKO
IIJIMA MOTOHIRO

JP2015251356A

March 24, 2016

December 24, 2015

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SUMITOMO MITSUI CONSTR CO LTD

E01D1/00; E01D2/04; E01D21/00

JP2004183433A	2004-07-02
JP2003328320A	2003-11-19

Kiyoshi Miyakawa

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