Device and method for clearing away of oyster of steel casings at sea

The invention discloses a device and method for clearing away of oyster of steel casings at sea and relates to the field of bridge construction. The device for clearing away of the oyster of the steel casings at sea comprises a steel sleeve and a steel brush, the diameter of the steel sleeve is larger than that of the to-be-brushed steel casings, the steel brush comprises plates fixed to the steel sleeve and a brush body extending towards the inside of the steel sleeve, and the brush body is fixed to the steel sleeve through the plates. The method for clearing away of the oyster of the steel casings at sea comprises the following steps that (1) the device for clearing away of the oyster is assembled and hoisted to the position over the to-be-brushed steel casings; and (2) the device for clearing away of the oyster is placed down to a bottoming concrete construction range and vertically hoisted and placed down so as to clear away the oyster outside the steel casings. According to the device and method for clea