Patent ID: 7648310

Claim:
A soil inflow prevention apparatus for use in an intercepting sewer that is provided at a discharge side of a drainage ditch and has one or more sewage inflow holes, the apparatus comprising: a rotating shaft transversely extending throughout a respective one of the sewage inflow holes; an angular-rotation opening/closing plate coupled to the rotating shaft and adapted to open and close the sewage inflow hole by rotation of the angular-rotation opening/closing plate about the rotating shaft in accordance with the amount of sewage, the rotating shaft being fixed to a center of the angular-rotation opening/closing plate by use of connection means; at least one opening stopper provided at a rear wall of the intercepting sewer to control an opening angle of the angular-rotation opening/closing plate; at least one rear weighting device provided at the lower surface of the rear portion of the angular-rotation opening/closing plate; at least one front weighting device provided at the lower surface of the front portion of the angular-rotation opening/closing plate; and at least one balancing stopper provided at the periphery of the sewage inflow hole in the front or rear of the rotating shaft to keep the angular-rotation opening/closing plate in a closed state, wherein the rear weighting device includes: a first nut that is fixed to the angular-rotation opening/closing plate and has a first longitudinal tap hole; and a first spiral shaft longitudinally fastened in the first tap hole and adapted to vary rotational momentum of the angular-rotation opening/closing plate about the rotating shaft via an adjustment in front and rear positions of the first spiral shaft, and wherein the front weighting device includes: a second nut that is fixed to the angular-rotation opening/closing plate and has a second longitudinal tap hole; and a second spiral shaft longitudinally fastened in the second tap hole and adapted to vary rotational momentum of the angular-rotation opening/closing plate about the rotating shaft via an adjustment in front and rear positions of the second spiral shaft.