| 摘要 |
PROBLEM TO BE SOLVED: To reduce form timbering of a column head part, and increase efficiency by introducing temporary prestressed concrete into bottom part concrete until prestressed concrete is introduced into top part concrete after the bottom part concrete of the column head part is placed. SOLUTION: After a bridge piece 1 is constructed, bottom part form timbering 4 and a bitty scaffold 5 are arranged on a parallel cross member 3d of a bracket unit 3 of a frame in an upper side part. Next, when bottom part concrete 2a is cured, a PC steel bar 8 is inserted into a sheath, and is tensioned, and temporary prestressed concrete is introduced. Afterwards, the bottom part form timbering 4 is disassembled, and a girder inside form timbering is arranged, and after prearranging the sheath into which a cantilever cable 9 is inserted, top part concrete 2b is placed. Next, prestressed concrete having the prescribed size is introduced into the top part concrete 2b by tension of the cantilever cable 9. Therefore, a column head part 2 is constructed, and a traveler 7 by integrally forming a form and timbering, is installed in the column head part 2, and a cantilever part can be smoothly and quickly executed. |
