| 摘要 |
Disclosed herein is a method for manufacturing preflex beams. The method includes the step of connecting the upper and lower plate girders 10a and 10b of a first set to each other. Thereafter, the upper and lower plate girders 10a' and 10b' of a second set are connected to each other. The first set and the second set are arranged in parallel. The upper plate girders 10a and 10a' are connected to each other, and the lower plate girders 10b and 10b' are connected to each other. A plurality of lower supporting stands 6 are placed under the lower crossbeams 7. A plurality of hydraulic jacks 4 are placed between the upper and lower plate girders 10a and 10b, and 10a' and 10b'. The upper flanges of the upper plate girders 10a and 10a' and the lower flanges of the lower plate girders 10b and 10b' are covered with concrete.
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