(57) Abstract Objective When digging in the foreign material selective vessel of the discharge mud water which is dischargedBlockade of the mud water exit which you can put is prevented. Constitution In aperture surface of vessel itself, uncommonness of gravel and the like in discharge mud waterAs the thing the shifter which it should sort remove is provided, under the vessel itselfTo provide the exit which should send out the discharge mud water to the section, main internal of the above-mentioned vesselThe stirring apparatus which should agitate the discharge mud water of inside the tank was provided, anti-Out the foreign material selective vessel of the mud water.
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