| 摘要 |
PURPOSE:To improve executing ability at a site and structual strength in a relatively large concrete beam. CONSTITUTION:An underconcrete beam member 2 which is given tension force in a pretension system by a PC steel member 10 is produced in a factory, and erected at a site. After that, the underconcrete beam member 2 is used instead of a form to place concrete in an upper concrete beam part 3. In addition, the upper concrete beam part 3 is given tension force in a posttension system by a PC cable 13. Thus the tension force composed in both the pretension system and the posttension system is given to the upper and lower concrete beam parts 2, 3 to produce fixed structural strength in a concrete beam 19. |
