| 摘要 |
PROBLEM TO BE SOLVED: To provide an erection method for a bridge girder, which enables the bridge girder to be jacked up by means of a simple jack device, and can shorten a construction period without the regulation of a juxtaposed general road. SOLUTION: When the bridge girders 1 and 2 constructed like upper and lower steps are erected between bridge piers 3 and 4, the respective bridge girders and bent devices are pushed up by the elongation of the jack device under the operation of expansion/contraction of the pair of general-purpose jack devices 5, 6, 8 and 9 which are arranged at both the ends of the bridge girder, and the operation of support by the bent devices 7 and 8 which are arranged between the respective jack devices. A new bent support is inserted and connected into the lower portion of the bent device pushed up; the jack device itself is pulled up by the contraction of it; and a new base for a jack is inserted and connected into the lower portion of the jack device pulled up. Subsequently, these steps are repeated in sequence, and the bridge girders are erected in prescribed positions by being horizontally located in a width direction when they each reach a predetermined height. Thus, only a narrow working space is required, and the number of days for regulating an ordinary traffic belt can be greatly reduced for the shortening of the construction period. COPYRIGHT: (C)2008,JPO&INPIT
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