| 摘要 |
PURPOSE:To easily reinforce a concrete structure of a road bridge and the like by a simple means. CONSTITUTION:After removing a paving material of a concrete structure 1, by drilling a large number of engagement holes 3 on the upper part of the concrete structure 1 so that they line up in the longitudinal and the cross directions of the concrete structure 1, arranging a large number of hollow PC steel bars 4 extending in the longitudinal direction so that they line up in the cross direction, simultaniously, arranging PC steel materials 5 in the hollow PC steel bars 4, with the hollow PC steel bars 4 as a reaction support member, the PC steel materials 5 are tightened with a jack. Thereafter, in the state where compressive force is applied to the hollow PC steel bars 4, by fixing end parts of the PC steel materials 5 on end parts of the hollow PC steel bars with a fixing tool, arranging grating reinforcing bars 8 on the upper part of the concrete structure 1 and connecting them to doweled reinforcing bars 9 engaged to the engagement holes 3, concrete 10 is deposited so as to bury the grating reinforcing bars 8 and the hollow PC steel bars 4. After the concrete 10 reaches specified strength, by releasing tensile force of the PC steel materials 5, tensile prestress is introduced to the concrete 10. |
