| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a propulsion pipe having the bending strength and external pressure strength larger than those of the conventional propulsion pipe using a Hume pipe and capable of preventing its damage at installation. SOLUTION: Fixing seat end plates 2 and 2 are provided at both ends of a concrete pipe body 1, a proper number of PC steel bars (steel bars for prestressed concrete) 3 fitted to the fixing seat end plates 2 and 2 at both ends are provided in the axial direction to apply prestress in the axial direction of the pipe body, and the pipe body is cured in an autoclave.</p> |
