| 摘要 |
PURPOSE: A manhole is provided to offer simple construction, to reduce a term of work and to prevent the manhole from floating by buoyancy in the rainy season by integrally curing a slab having a reinforcing rod to a lower portion of a manhole made of synthetic resins. CONSTITUTION: A manhole made of synthetic resins connected to a drain pipe(11) at the exterior surface includes a reinforcing rod(20) mounted by passing through a lower end portion of the manhole(10), a water expansion rubber(30) wound on the lower outer surface of the manhole, a slab(40) integrally cured with the lower portion of the manhole by being inserted in the lower potion of the manhole to insert the water expansion rubber, and a plurality of engaging rings mounted at an edge part of an upper surface end portion of the slab.
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