| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a precast arch tunnel in which deterioration states of PC steel materials can be easily determined and replacement work of installed PC steel materials can be simply performed.SOLUTION: A precast arch tunnel W is constructed in such a manner that a plurality of arch sections 1, each of which is formed by assembling the predetermined number of precast concrete slabs 10, are connected together in an extension direction on a foundations 2 extended in the extension direction. In each arch section 1, PC steel materials 101a, 101b tensioned along the circumferential direction of the outer peripheral surface thereof are installed, and pre-stress is applied to the arch section in the circumferential direction by the PC steel materials 101a, 101b. Moreover, tensioned PC steel materials 103 extending in the extension direction are installed on the outer peripheral surface of the tunnel W, and pre-stress is applied to the arch sections 1 in the extension direction by the PC steel materials 103, thereby integrating the connected arch sections 1 together.</p> |
