Abstract:
A method for disassembling a boiler supported on a supporting structure is disclosed. The method includes a holder installation step for providing a vertically extendable ascent-descent holder below the boiler; a holder lifting step for increasing a height of the ascent-descent holder to a position close to or in contact with a lower end of the boiler; a cutting step for cutting off a lower part of the boiler, the lower part extending from the lower end of the boiler to a predetermined height; and a removal step for removing the lower part from the holder, after the lower part being cut off and the weight of the lower part being transferred to the ascent-descent holder; the holder installation step, the holder lifting step, the cutting step, and the removal step are repeatedly carried out for successively disassembling the boiler from a bottom side thereof.
Abstract:
A dismount method of a large-sized tank by cutting is disclosed. The dismount method contains a cutting step of cutting the tank main body successively from a top at an almost central position so as to draw a swirl cut line to a bottom thereof to form a band with a predetermined width.
Abstract:
A method for disassembling a boiler supported and suspended by a supporting structure which includes the steps of cutting off a lower part of a furnace unit to provide an enlarged opening; fixing a first support to the furnace unit at approximately same height as a lower end of a heat recovery area; fixing a second support to the lower end of the heat recovery area; providing a first jacking apparatus and a second jacking apparatus under the first support and the second support, respectively; detaching the boiler from the suspending structure; lowering the first support and the second support by the first jacking apparatus and the second jacking apparatus, cutting a lower part of the boiler, repeating the lowering and the disassembling steps until the first support and the second support are lowered to a maximum extent; and disassembling a remaining upper part of the boiler.
Abstract:
A method for disassembling a boiler supported by a supporting structure is disclosed. The method comprises an enlarged opening forming step for cutting off a lower part of the furnace unit to prepare an enlarged opening in the furnace unit; a first support installation step for fixing a first support to a furnace unit approximately at the same height as a lower end of a heat recovery area; a second support installation step for fixing a second support to the lower end of the heat recovery area; a boiler supporting step for providing a first jacking apparatus and a second jacking apparatus respectively under the first support and the second support so that the entire weight of the boiler is supported by the first jacking apparatus and the second jacking apparatus via the first support and the second support; a suspension state cancellation step for detaching the boiler from the suspending structure; a lowering and disassembling step for lowering the first support and the second support by the first jacking apparatus and the second jacking apparatus, and cutting a lower part of the boiler, the lowering and the disassembling step being repeated until the first support and the second support are lowered to a maximum extent; and a remainder disassembling step for disassembling a remaining upper part of the boiler.