| 摘要 |
There is provided a foothold comprising a tread, side portions positioned at both sides of the tread, legs to be inserted into a concrete wall, said tread, side portions and legs being formed of a core and first and second synthetic resins for covering the core, said second synthetic resins for covering the core of the legs having a substantially circular shape in cross section, and the first and second synthetic resins being integrated with each other, a plurality of fins provided axially on outer peripheries of the synthetic resins in a plurality of stages in the direction from the legs toward the side portions, and contact support pieces protruded from boundaries between the side portions and legs so as to bring into contact with the concrete wall. The contact support pieces can be reliably fitted to the wall surface to reliably prevent the foothold from hanging down, and the plurality of fins provided on the legs are reliably and easily fitted to the holed defined in the wall surface to reliably fix the foothold to the manhole wall, thereby providing the foothold capable of enduring for a long period of use.
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