Patent ID: 6817120
Filing Date: 2004-11-16
Classification: E02B,Y02A

Abstract:
A method of discharging deposits in a deposit discharge system including a discharge tube having a suction port opened so as to face a bottom face of water in a water storing place on which deposits are deposited, a straight tube part vertically extending upward from the suction port, and a discharge port opening in a water path on a downstream side of the water storing place for draining the deposits from the water storing place to the water path together with water stream, the method comprising the steps of:piercing the discharge tube through a bank hole, which is located below a top surface of the water of the water storing place; suspending the discharge tube by a boat, which floats on the top surface of the water, so as to locate the discharge tube under the top surface of the water of the water storing place; and repeatedly lifting the discharge tube to a prescribed level and freely dropping the discharge tube by an elevating unit disposed on a boat, so as to repeatedly move the suction port close to and away from the water bottom face of the water storing place in a prescribed cycle, whereby a pulsating flow is generated in the discharge tube for discharging the deposits, the pulsating flow having negative pressure parts, which are produced by sucking low pressure water with a high concentration of the deposits through the suction port when the suction port contacts the water bottom face of the water storing place and the suction port is closed, and the pulsating flow also having positive pressure parts, which are generated by sucking high pressure water with a low concentration of the deposits when the suction port is lifted above the water bottom face of the water storing place and the suction port is opened, the water with the high concentration of the deposits being plugs, the plugs and the water with the low concentration of the deposits alternately appearing, thus forming the pulsating flow in the discharge tube.