Unifying with the invert where the derived flow channel in order it flows to guide the side wall

摘要

PROBLEM TO BE SOLVED: To easily and quickly install a small-sized manhole by mounting a direct wall on a bottom block integrating a side wall and an invert, and mounting a cover body through an oblique wall and upper and lower adjusting part thereon. SOLUTION: A side wall 8 provided with at least one of joints 7, 7 for pipe connection, and an invert 9 in which a flow guide ditch 9A for flowing and guiding sludge or the like is formed are integrated to construct the bottom block 2 of a small-sized manhole. The bottom block 2 is mounted and fixed on the upper face of a foundation board 1, a cylindrical direct wall 3 is mounted and fixed on the upper end of the bottom block 2, and a cover body 6 is mounted through a cylindrical oblique wall 4 and upper and lower adjusting parts on the upper end of the direct wall 3. Subsequently, an inflow pipe 11 and an outflow pipe 12 are inner-fitted and connected to the joint 7. Thereby, the small-sized manhole can be easily and quickly installed and the flow and guide of sludge or the like can be performed.