| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for repairing a roadbed laid with precast (PC) pavement boards absorbing the vibration of the PC boards, fixing the PC boards over a long period, excellent in the permeability to the ground, infiltrating an elastic foam body into small gaps quickly with the foam pressure to exert an adhesive effect when it is injected, finishing hardening in a short time, and capable of shortening the work time. SOLUTION: An elastic foam body formed by foaming an urethane composition in particular and having the expansion ratio of 1.2-3.0 is injected into the gaps generated between the PC pavement boards and the roadbed in this method for repairing the roadbed laid with the PC pavement boards. The main agent and the hardening agent of the urethane composition are separately fed and mixed, and the mixture with the viscosity of 2,000 cp or below in particular is injected and foamed in the method for repairing the roadbed laid with the PC pavement boards.
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