Ash bunker cleaning method

Abstract

To provide an ash bunker cleaning method capable of efficiently cleaning the inside by removing combustion ashes stuck to the wall surface and the bottom surface of an ash bunker.SOLUTION: In cleaning of an ash bunker 1, combustion ashes stuck to the wall surface 13 and the bottom surface 12 of the ash bunker 1 in which an overhead crane 2 is installed are removed. The cleaning method of the ash bunker 1 comprises: a step of moving the overhead crane 2 to position a gondola 5 near the wall surface 13; a step of fixing the gondola 5 which an operator 30 can get on and can vertically move to the overhead crane 2; a step of removing using a high pressure washing machine, the combustion ashes stuck to the wall surface 13 while vertically moving the gondola 5 with the overhead crane 2 stopped; and a step of removing the gondola 5 from the overhead crane 2.SELECTED DRAWING: Figure 8

Description

[Technical field]

[0001] The present invention relates to a method for cleaning an ash bunker, and more particularly to a method for cleaning an ash bunker for storing incineration ash. [Background technology]

[0002] Ash bunkers for incinerators are facilities that temporarily store incineration ash and are installed in incineration equipment such as waste incineration facilities. Since large amounts of incineration ash are accumulated and stored in the ash bunkers over a long period of time, the moisture contained in the ash causes the ash to adhere to the bottom and walls. This reduces the amount of storage that the ash bunker can hold and also raises concerns about deterioration of the equipment, such as cracks in the walls, so regular cleaning and maintenance are required.

[0003] As a method for removing incineration ash from an incinerator, a method is known in which the incineration ash remaining in the incineration facility is directly collected by a vacuum suction device (Patent Document 1). In a sealed working space, the incineration ash is collected by suction from a nozzle, and the exhaust air is purified by an air purifier and discharged to the outside. The incineration ash adhering to the peripheral wall of the incinerator is blown off by sandblasting.

[0004] A known method for removing deposits such as incineration ash involves spraying dry ice pellets from a spray nozzle onto the surface to be cleaned, causing them to collide with the deposits, and removing the deposits from the surface to be cleaned by the force of the collision (Patent Document 2). The dry ice pellets from the spray nozzle gradually collapse from their tips while pushing aside the deposits, and the tips expand radially and penetrate between the surface to be cleaned and the deposits, thereby peeling them off from the surface to be cleaned. At the same time, the dry ice pellets rapidly change from a solid to a gas due to their sublimation, and the volume expansion associated with vaporization blows off the deposits around the collision point and peels them off from the surface to be cleaned. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-320936 A [Patent Document 2] JP 2008-281332 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the method of removing incineration ash described in Patent Document 1, the work was basically done manually, so cleaning the vast incinerator took a very long time. Generally, incinerators are constantly burning, so the layer of incineration ash is thin and the amount of accumulation is not very large, but since the ash bunker is filled with incineration ash, the incineration ash near the bottom and wall hardens due to its weight and moisture. The layer of hardened incineration ash can be 3m or more thick, so removing it by sandblasting requires a lot of effort. In addition, the post-processing of the sandblasted material also increases the amount of work.

[0007] Even in the method of removing adhesions described in Patent Document 2, it is difficult to peel off the incineration ash that has accumulated to a depth of several meters from the surface to be cleaned using dry ice granules. In addition, the cost burden of cleaning the incineration ash is also large because dry ice granules are used. Furthermore, similar to the removal of incineration ash by sandblasting, it requires a lot of effort to remove incineration ash that has accumulated to a depth of several meters or more using dry ice granules.

[0008] Both patent documents are intended to remove a thin layer of deposits that have adhered to the walls inside an incinerator, and it was difficult to use them to remove huge amounts of incineration ash that have accumulated and hardened over a long period of time, such as in ash bunkers.

[0009] Since the ash bunker is deep and the incineration ash is stuck to the high part of the wall, the work of removing the stuck incineration ash 10 was carried out by setting up a scaffolding 201 on the wall as shown in Figure 15. In addition, the incineration ash piled up at the bottom was removed by chipping tools such as sandblasting and various hammers, which required a lot of manpower and a huge amount of time.

[0010] In addition, high-pressure washing may be performed as a finishing touch to the cleaning of the wall surface, and the worker 30 cleaned the high positions of the ash bunker by lowering the gondola 202 as shown in FIG. 16. Specifically, the gondola 202 was fixed to the wall surface 13 by hooking the fixing part 221 of the gondola 202 to the protrusion 220A of the wall surface. However, when cleaning with the gondola 202, the distance between the wall surface 13 and the worker 30 was close, so the cleaning liquid of the high-pressure washing was reflected from the wall surface 13 and splashed on the worker 30, creating a poor working environment. When cleaning the wall surface 13 with the gondola 202, it was difficult to perform high-pressure washing away from the wall surface 13. Furthermore, because the distance between the gondola 202 and the wall surface 13 was close, the gondola 202 could not be used when the incineration ash 10 had accumulated on the wall surface 13 as shown in FIG. 15. The opposite wall was a smooth wall and did not have the protrusion 220A, so the gondola 202 could not be hung. Therefore, the only way to carry out high-pressure cleaning was to use scaffolding 201, which takes time and is costly to set up.

[0011] The waste incineration facilities where ash bunkers are installed are in constant operation and it is difficult to stop them for long periods of time, so operators have been requesting a shorter cleaning period. For these reasons, there has been a demand for a method to efficiently remove the huge amount of incineration ash that has adhered to the bottom and walls of the ash bunkers.

[0012] Therefore, an object of the present invention is to provide a method for cleaning an ash bunker that can remove incineration ash adhering to the walls and bottom of the ash bunker and efficiently clean the inside. [Means for solving the problem]

[0013] In order to solve the above problems, a method for cleaning incineration ash adhered to the wall surface of an ash bunker equipped with an overhead crane is provided, comprising the steps of: positioning the overhead crane near the wall surface; fixing a gondola that can be accessed by a worker and that can move up and down to the overhead crane; removing the incineration ash adhered to the wall surface with a removal device while moving the gondola up and down while the overhead crane is stopped; and removing the gondola from the overhead crane.

[0014] It is also preferable that the method further includes the steps of releasing the gondola from the overhead crane and placing the gondola on the bottom of the ash bunker, moving the overhead crane a predetermined distance from its existing position, re-fixing the gondola placed on the bottom to the overhead crane, and removing the incineration ash adhered to the wall surface with the removal device while moving the gondola up and down with the overhead crane stopped.

[0015] In addition, it is preferable that the ceiling crane has a crane section having a bucket for discharging the incineration ash, and a garter that holds the crane section movably in a predetermined direction and is movable in a direction perpendicular to the predetermined direction, and that the gondola is fixed to the garter at at least two points.

[0016] In addition, the gondola is fixed to a fixing jig provided on the garter, and when cleaning the wall surface parallel to the specified direction in a plan view, it is preferable to perform the following steps: fixing the gondola to the fixing jig while the ceiling crane is stopped near the wall surface; removing the incineration ash adhered to the wall surface with a removal device while moving the gondola up and down while the ceiling crane is stopped; releasing the fixation between the gondola and the fixing jig and placing the gondola on the bottom of the ash bunker; moving the fixing jig from its existing position on the garter in the specified direction; fixing the gondola placed on the bottom surface to the fixing jig again; and removing the incineration ash adhered to the wall surface while moving the gondola up and down while the ceiling crane is stopped.

[0017] In addition, the gondola is fixed to a fixing jig provided on the girder, and when cleaning the wall surface that is parallel to the perpendicular direction in a plan view, it is preferable to perform the following steps: fixing the gondola to the fixing jig while the ceiling crane is stopped near the wall surface; removing the incineration ash adhered to the wall surface with a removal device while moving the gondola up and down while the ceiling crane is stopped; releasing the fixation between the gondola and the fixing jig and placing the gondola on the bottom of the ash bunker; traveling the ceiling crane for a predetermined distance; fixing the gondola placed on the bottom surface to the fixing jig again; and removing the incineration ash adhered to the wall surface while moving the gondola up and down while the ceiling crane is stopped. Effect of the Invention

[0018] According to this configuration, the gondola is fixed to the overhead crane and positioned near the wall surface, and the removal device removes the incineration ash from the wall surface by moving the gondola up and down. Therefore, the distance between the gondola and the wall surface can be adjusted as desired by placing the overhead crane at a desired position. This allows the worker on the gondola to be separated from the wall surface, and the deterioration of the working environment due to the rebound when the removal device removes the incineration ash from the wall surface can be suppressed. In addition, as shown in FIG. 16, compared to cleaning high places by setting up scaffolding 201 on a smooth wall surface 13 where a gondola cannot be installed, all of the wall surfaces 13 in the ash bunker can be cleaned with the gondola. This makes it possible to reduce costs, manpower, and cleaning time compared to the conventional case of setting up a gondola and scaffolding. Furthermore, since the incineration ash stuck to the wall surface is removed only by moving the gondola up and down without moving the overhead crane, the work can be performed in a safe condition.

[0019] With this configuration, when the overhead crane is moved, the gondola is placed on the bottom to separate the overhead crane from the gondola, which makes it possible to prevent the gondola from colliding with a wall when the overhead crane is moved. Also, since the overhead crane is moved without workers on board, the ash bunker can be cleaned by the gondola in a safe manner.

[0020] With this configuration, the gondola is fixed to the garters of the overhead crane, so the position where the gondola is suspended can be changed by the movement of the overhead crane. This allows the removal of incineration ash from the wall surface to be carried out efficiently. In addition, the gondola is fixed to the garters at at least two points, so it is possible to prevent the gondola from falling.

[0021] According to this configuration, the gondola is fixed to the fixing jig installed on the girder for cleaning work, and the position where the gondola is suspended can be changed by moving the fixing jig. This allows efficient removal of incineration ash from the wall surface. In addition, since the wall surface parallel to the specified direction can be cleaned by the simple method of moving the fixing jig, it is possible to achieve more efficient cleaning of the ash bunker than when scaffolding is set up as shown in Figure 16.

[0022] According to this configuration, the gondola is fixed to the fixture installed on the girder for cleaning work, so the position where the gondola is suspended can be changed by moving the overhead crane. This allows efficient removal of incineration ash from the wall surface. In addition, the wall surface parallel to the orthogonal direction can be cleaned by simply moving the overhead crane for a specified distance, so that the ash bunker cleaning work can be realized more efficiently than when scaffolding is set up as shown in Figure 16.

[0023] This makes it possible to provide a method for cleaning an ash bunker that can remove incineration ash that has adhered to the walls and bottom of the ash bunker and efficiently clean the inside. [Brief description of the drawings]

[0024] [Figure 1] FIG. 2 is a diagram showing the recovery of incineration ash by an overhead crane in the ash bunker according to the first embodiment of the present invention. [Diagram 2] 2 is a flowchart of an ash bunker cleaning method according to a first embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing a hydraulic excavator being brought into the ash bunker according to the first embodiment of the present invention by an overhead crane. [Figure 4] FIG. 2 is a diagram showing a state where the stuck incineration ash 10 is crushed by a hydraulic excavator in the ash bunker according to the first embodiment of the present invention. [Diagram 5] FIG. 2 is a diagram showing the state in which incineration ash 10 that has adhered to a high position on a wall surface of the ash bunker according to the first embodiment of the present invention is crushed by a breaker of a hydraulic excavator. [Figure 6] FIG. 2 is a diagram showing the state in which incineration ash is collected in the center by a hydraulic excavator and then recovered by an overhead crane in the ash bunker according to the first embodiment of the present invention. [Figure 7] FIG. 2 is a diagram showing a state in which a hydraulic excavator is used to dig over bottom stones in the ash bunker according to the first embodiment of the present invention. [Figure 8] FIG. 2 is a diagram showing a state in which a gondola is suspended from the support part of an overhead crane to wash a wall surface in the ash bunker according to the first embodiment of the present invention. [Figure 9] FIG. 11 is a diagram showing a hydraulic excavator being brought into the ash bunker according to the second embodiment of the present invention by a crawler crane. [Figure 10] 5 is a flow chart of a method for cleaning an ash bunker according to a third embodiment of the present invention. [Figure 11] 10 is a flowchart of a method for cleaning an ash bunker according to a fourth embodiment of the present invention. [Figure 12] FIG. 13 is a diagram showing a state in which a gondola is suspended from the garter of an overhead crane to wash a wall surface in an ash bunker according to a fifth embodiment of the present invention. [Figure 13] FIG. 13 is a plan view showing the state in which a fixing jig is fixed onto the girder of an overhead crane when cleaning the front-to-rear wall surfaces of an ash bunker in a fifth embodiment of the present invention. [Figure 14] FIG. 13 is a plan view showing the state in which a fixing jig is fixed onto the girder of an overhead crane when cleaning the left and right wall surfaces of an ash bunker in a fifth embodiment of the present invention. [Figure 15] FIG. 1 shows how scaffolding is set up in a conventional ash bunker to remove incineration ash. [Figure 16] A diagram of a conventional ash bunker when a gondola is lowered from a wall surface to perform high-pressure washing on the wall surface. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] A method for cleaning an ash bunker 1 according to a first embodiment of the present invention will be described with reference to Figures 1 to 8. As shown in the figures, the top, bottom, left and right directions are defined, and the front side of the paper in Figure 1 is defined as the rear, and the back side of the paper is defined as the front. In this embodiment, efficient cleaning work is performed by using a hydraulic excavator 4 placed inside the ash bunker 1.

[0026] The ash bunker 1 is a facility for temporarily storing incineration ash 10 generated in an incinerator, and is installed in a building of an incineration facility such as a garbage incineration plant. The ash bunker 1 is provided with an overhead crane 2 for carrying in and discharging the incineration ash 10. The incineration ash 10 in the ash bunker 1 is discharged by the overhead crane 2 to a storage section 20 placed on a floor surface 20A outside the ash bunker 1, and is then carried away by a truck or the like. Bottom stones 3 are piled up to about 1m on the bottom surface 12 of the ash bunker 1, which keeps water from draining from the drainage outlet 11 when the incineration ash 10 is piled up. The incineration ash 10 is stuck and accumulated on the bottom surface 12 and wall surface 13 of the ash bunker 1, and cannot be discharged to the outside by the overhead crane 2. In addition, if the drainage outlet 11 is clogged with stuck incineration ash 10, moisture cannot flow out to the outside, and the layer of stuck incineration ash 10 becomes high. For this reason, the ash bunker 1 must be cleaned periodically.

[0027] The overhead crane 2 is a bucket type and is composed of a crane bucket 21, a drive unit 22, a support unit 23, and a hanging wire 24. The overhead crane 2 is a two-axis mobile overhead crane that can move freely in the space of the ash bunker 1 in the front-rear and left-right directions. A roughly cylindrical buffer 21A is provided at the upper end of the crane bucket 21 to prevent damage to the wall surface 13 when the overhead crane 2 comes into contact with the wall surface 13 during movement. A claw 21B is provided at the lower end of the crane bucket 21, which can dismantle the incineration ash 10 that has hardened to a certain extent.

[0028] The crane bucket 21 is structured to sandwich the incineration ash 10 from the left and right directions and take it inside, and by closing it, it maintains the state in which the incineration ash 10 is taken inside. Specifically, as shown in Figure 1, the crane bucket 21 is operated to be positioned above the piled up incineration ash 10 in an open state, and the crane bucket 21 is closed in the direction of the arrow to take in the incineration ash 10 inside. In this state, the crane bucket 21 is moved upward and to the right to open the crane bucket 21 at the storage section 20 and move the incineration ash 10.

[0029] The drive unit 22 houses a hydraulic cylinder and a hydraulic pump for opening and closing the crane bucket 21. Operations such as opening, closing, and moving the crane bucket 21 in the overhead crane 2 are performed by an operator in a cab (not shown).

[0030] The support portion 23 is provided on the upper portion of the support portion 23 and has a predetermined area in the front-rear and left-right directions. When the crane bucket 21 is in an open state, the support portion 23 protrudes slightly beyond the left-right ends of the crane bucket 21. The hoisting wire 24 is driven by a hoisting motor (not shown) to move the crane bucket 21 up and down.

[0031] In this embodiment, a hydraulic excavator 4 is inserted into the space of the ash bunker 1 to crush the stuck incineration ash 10, thereby performing cleaning work. As shown in FIG. 3, the hydraulic excavator 4 is composed of a bucket 41, an arm 42, a control unit 43, and crawlers 44. The bucket 41 is detachable from the arm 42, and can be replaced with a breaker 45 shown in FIG. 5 or a net bucket 46 shown in FIG. 7. The arm 42 is driven by a plurality of hydraulic cylinders, and is operated by the worker 30 of the control unit 43. The crawlers 44 enable the hydraulic excavator 4 to move within the ash bunker 1.

[0032] A method for cleaning the ash bunker 1 will be described with reference to Fig. 2. In the method for cleaning the ash bunker 1 of this embodiment, a hydraulic excavator 4, which is a movable heavy construction machine, is placed inside the ash bunker 1. The heavy construction machine placed in the ash bunker 1 is not limited to the hydraulic excavator 4, and may be a wheel loader, a bulldozer, a skid steer loader, a compact track loader, a motor grader, a mobile crane, or the like.

[0033] 3, with the crane bucket 21 open, the hydraulic excavator 4 placed on the floor surface 20A is fixed to the crane bucket 21 using a wire, a chain block, a shackle, or the like. Specifically, the arm 42 of the hydraulic excavator 4 is fixed at least at two points to hooks (not shown) of the crane bucket 21, and the control part 43 is fixed at least at two points to hooks (not shown) of the crane bucket 21.

[0034] With the hydraulic excavator 4 fixed to the crane bucket 21, as shown by the arrow in Fig. 3, the hoisting wire 24 is wound up to hoist the hydraulic excavator 4, the overhead crane 2 is moved to move the hydraulic excavator 4 into the ash bunker 1, and the hoisting wire 24 is lowered to place the hydraulic excavator 4 on the accumulated and stuck incineration ash 10 (S1). As shown in Fig. 4, the worker 30 operates the hydraulic excavator 4 to break down the stuck incineration ash 10 with the crane bucket 21, and collects the incineration ash 10 in the center of the ash bunker 1 (S2).

[0035] Since the arm 42 of the hydraulic excavator 4 cannot reach the high part of the wall surface 13, as shown in FIG. 5, the incineration ash 10 collected near the wall surface 13 is piled up to gain height, and the position of the hydraulic excavator 4 is raised to crush the incineration ash 10 stuck to the wall surface 13 at the high part (S3, S4). At this time, if the incineration ash 10 is hardened and cannot be demolished with the bucket 41, the tip of the arm 42 is replaced from the bucket 41 to a breaker 45. The breaker 45 crushes the incineration ash 10 stuck to the wall surface 13 by striking the incineration ash 10 with a protrusion having a substantially cylindrical shape. At this time, if the incineration ash 10 is crushed by the breaker 45 up to the vicinity of the wall surface 13, there is a possibility that it will come into contact with the wall surface 13. Therefore, the crushing process of the incineration ash 10 is terminated near the wall surface 13, and the wall surface 13 is cleaned by high-pressure washing using water as described later.

[0036] By changing the position where the incineration ash 10 is piled up, the incineration ash 10 stuck to all four wall surfaces 13 is removed. As shown in FIG. 6, the incineration ash 10 crushed at the bottom surfaces 12 and 13 is collected near the center of the ash bunker 1 by the bucket 41 and collected in the storage section 20 by the overhead crane 2. The incineration ash 10 may be collected by packing it into a flexible container and lifting it with the overhead crane 2. When the removal of the incineration ash 10 from all four wall surfaces 13 and the discharge of the incineration ash 10 are completed, the bottom stones 3 are exposed as shown in FIG. 7.

[0037] The tip of the arm 42 of the hydraulic excavator 4 is switched from the breaker 45 or bucket 41 to the net bucket 46, and the bottom stone 3 is excavated. At this time, since the bottom of the net bucket 46 is mesh-like, the incineration ash 10 adhering to the bottom stone 3 can be shaken off and only the bottom stone 3 can be excavated.

[0038] The excavated bottom stones 3 are washed with water by the worker 30 while stored in the net bucket 46, and the incineration ash 10 adhering to the surrounding area is completely removed. The washing water may be discharged to the outside from the drainage outlet 11, or may be discharged outside the ash bunker 1 by the water intake pump.

[0039] The bottom stones 3 are collected and piled up in one place using a hydraulic excavator 4, and the exposed bottom surface 12 is cleaned by a worker 30 using a high-pressure water washer 40. At the same time, the incineration ash 10 that has completely adhered to the inside of the drainage outlet 11 is removed using a chipping tool such as a high-pressure washer or a breaker.

[0040] Next, the hydraulic excavator 4 is carried out of the ash bunker 1 using the overhead crane 2 (S5). Specifically, as in the case of carrying in, with the crane bucket 21 open, the hydraulic excavator 4 placed on the bottom surface 12 is fixed to the crane bucket 21 using a wire, a chain block, a shackle, or the like. The hydraulic excavator 4 is carried out of the ash bunker 1 by the overhead crane 2 and placed on the floor surface 20A. The hydraulic excavator 4 is carried out of the ash bunker 1 in order to prevent the hydraulic excavator 4 from getting wet or submerged in water when the wall surface 13 is high-pressure washed with water, which will be described later.

[0041] As shown in Fig. 8, a gondola 5 is attached to a crane bucket 21 to clean a wall surface 13 with a high-pressure cleaner 40. The gondola 5 is a deck-type gondola, and is composed of a deck 51, a fence 52, and a gondola wire 53. The gondola wire 53 is an example of a connecting material of the present invention.

[0042] The deck 51 is generally rectangular when viewed from above and is larger than the crane bucket 21, with a fence 52 provided around the periphery to prevent falling. The deck 51 is large enough for two to three workers 30 to ride on, and is capable of placing the high-pressure washer 40 thereon. A cushioning material 51A is provided on the lower part of the deck 51, protruding outward around the entire periphery. The cushioning material 51A can reduce damage to the wall surface 13 when the gondola 5 comes into contact with the wall surface 13. The high-pressure washer 40 is an example of a removal device of the present invention.

[0043] When attaching the gondola 5 to the crane bucket 21, as shown by the dotted line in FIG. 8, the gondola 5 is placed on the floor surface 20A and the crane bucket 21 is brought close to the gondola 5. The gondola wire 53 is hung from the hook portion 23A provided on the support portion 23. At this time, the gondola 5 and the overhead crane 2 are hung by the gondola wire 53 at least at the four corners of the deck 51. The gondola wire 53 is hung by at least two gondola wires 53 at one point so that the gondola 5 does not fall even if it is cut (S6). In addition to the gondola wire 53, a chain block or the like may be used to adjust the length of the gondola wire 53. In addition, when fixing the gondola 5 to the overhead crane 2, the gondola 5 is fixed at the highest position.

[0044] After the overhead crane 2 and gondola 5 are secured together with the gondola wire 53, the overhead crane 2 is moved into the ash bunker 1 as shown by the arrow in the figure. The gondola 5 is placed on the bottom surface 12, and the worker 30 gets into the gondola 5, and the wall surface 13 is washed with the high-pressure washer 40 (S7). At this time, the wall surface 13 is washed only by the up and down movement of the gondola 5, with the overhead crane 2 stopped. Specifically, the worker 30, who is standing on the bottom stone 3 of the bottom surface 12, lowers the gondola 5 by remote control, placing it on the bottom surface 12, puts the worker 30 in the gondola 5, closes the fence 52, and raises the gondola 5 to perform the washing work.

[0045] When the worker 30 washes the wall surface 13 with the high-pressure washer 40, the position of the overhead crane 2 is set at a distance of 2 to 3 m from the wall surface 13. This prevents the high-pressure washing water from reflecting off the wall surface 13 and falling on the worker 30, improving the working environment of the worker 30.

[0046] By moving the overhead crane 2, the worker 30 in the gondola 5 can perform high-pressure washing of all four wall surfaces 13. At this time, it is preferable to perform high-pressure washing by descending from the top of the wall surface 13 to the bottom. When moving the overhead crane 2 from one wall surface 13 to another wall surface 13, the gondola 5 is lowered to the bottom surface 12, the worker 30 is removed from the gondola 5, and the gondola 5 is raised without any person in the gondola 5, and the crane bucket 21 is lowered with the gondola wire 53 at its shortest length to position the gondola 5 at the bottom surface 12. The worker 30 separates the support part 23 from the gondola wire 53, raises the crane bucket 21, and moves the overhead crane 2 to the vicinity of the wall surface 13 to be cleaned. The worker 30 carries the gondola 5 to directly below the crane bucket 21, lowers the crane bucket 21, and fixes the support part 23 and the gondola wire 53. In other words, when the overhead crane 2 moves, the gondola 5 and the support part 23 are separated. This allows the overhead crane 2 to be moved in a safe condition. Note that the overhead crane 2 may be moved by winding up the gondola wire 53 and bringing the gondola 5 and the crane bucket 21 close to each other when the worker 30 is not on board.

[0047] When all of the wall surfaces 13 are completed, the gondola 5 is lowered to the bottom surface 12, the worker 30 is removed from the gondola 5, the gondola 5 is raised and the gondola wire 53 is made as short as possible, and the overhead crane 2 is moved to remove the gondola 5 from the ash bunker 1 as shown by the dotted line in Fig. 8, and the gondola 5 is placed on the floor surface 20A. The connection between the support part 23 and the gondola 5 by the gondola wire 53 is released, and the gondola 5 is removed from the overhead crane 2 (S8).

[0048] The worker 30 uses a pump to drain the water that has accumulated on the bottom surface 12, and performs high-pressure washing of the bottom stones 3 and the bottom surface 12 (S9). Finally, since some of the bottom stones 3 are also discharged when the incineration ash 10 is discharged into the storage section 20 by the overhead crane 2, the worker 30 replenishes the bottom stones 3 and piles them up to a specified height, completing the cleaning work of the ash bunker 1.

[0049] According to this configuration, the gondola 5 is fixed to the overhead crane 2 and positioned near the wall surface 13, and the gondola 5 is moved up and down to remove the incineration ash 10 adhered to the wall surface 13 by the high-pressure cleaner 40. Therefore, the distance between the gondola 5 and the wall surface 13 can be adjusted as desired by arranging the overhead crane 2 at a desired position. This allows the worker 30 riding on the gondola 5 to be separated from the wall surface 13, and the deterioration of the working environment due to the rebound when the incineration ash 10 adhered to the wall surface 13 is removed by the high-pressure cleaner 40 can be suppressed. In addition, as shown in FIG. 16, compared with the case where a scaffolding 201 is set up to clean high places on a smooth wall surface 13 on which a gondola 202 cannot be installed and a scaffolding 201 is set up, all the wall surfaces 13 in the ash bunker 1 can be cleaned with the gondola 5 as shown in FIG. 8. This allows the cost and manpower saving and the cleaning period to be shortened compared to the case where the conventional gondola 202 and scaffolding 201 are set up. Furthermore, the incineration ash 10 stuck to the wall surface 13 can be removed only by the up and down movement of the gondola 5 without moving the ceiling crane 2, so that the work can be performed in a safe environment.

[0050] With this configuration, when moving the overhead crane 2, the gondola 5 is placed on the bottom surface 12 to separate the overhead crane 2 from the gondola 5, which makes it possible to prevent the gondola 5 from colliding with a wall when the overhead crane 2 is moved. In addition, since the overhead crane 2 is moved without the worker 30 on board, cleaning work of the ash bunker 1 can be performed in a safe manner.

[0051] Since the gondola 5 is fixed to the overhead crane 2, it is not necessary to fix the gondola 5 to the wall surface 13 and change the gondola 5 for each wall surface 13, and the gondola 5 can be moved by the overhead crane 2. This allows efficient cleaning work in the ash bunker 1.

[0052] With this configuration, the gondola 5 and the overhead crane 2 are fixed to each other at the four corners of the deck 51 by the gondola wires 53, so the gondola 5 can move stably without swinging when the overhead crane 2 moves. Also, since the gondola wires 53 are made up of at least two wires at each of the four corners, the gondola 5 can be lowered safely to the bottom surface 12 without tilting even if one of the gondola wires 53 breaks.

[0053] According to this configuration, the hydraulic excavator 4, which can be self-propelled by the ceiling crane 2, is placed in the ash bunker 1 and the incineration ash 10 is removed, so that the cleaning work of the ash bunker 1 can be performed efficiently. In particular, when the ash bunker 1 is deep from top to bottom and the incineration ash 10 that has adhered to the bottom surface 12 and hardened is several meters deep, even if the worker 30 uses a sandblasting machine or other work equipment by hand, it is very inefficient and requires a lot of manpower. In contrast, in the present invention, the hardened incineration ash 10 can be removed and collected by the hydraulic excavator 4, so that the overall work time can be significantly reduced and the cleaning work of the ash bunker 1 can be performed by a small number of people.

[0054] Since the hydraulic excavator 4 is carried in and out of the ash bunker 1 using the overhead crane 2, the hydraulic excavator 4 can be positioned at a desired position within the ash bunker 1. In addition, since the hydraulic excavator 4 is self-propelled, there is no need to use the overhead crane 2 to move the hydraulic excavator 4 whenever necessary during work, and the ash bunker 1 can be cleaned efficiently.

[0055] According to this configuration, the hydraulic excavator 4 is fixed to the overhead crane 2 at at least two points on the arm 42 and at least two points on the control unit 43, so that the hydraulic excavator 4 can be prevented from losing its posture or falling while the overhead crane 2 is moving. In addition, since the hydraulic excavator 4 is used, the incineration ash 10 stuck to the wall surface 13 at a high position can also be demolished by driving the arm 42 to operate the bucket 41, breaker 45, or net bucket 46.

[0056] According to this configuration, the hydraulic excavator 4 is moved over the piled up incineration ash 10 to remove the incineration ash 10 that has adhered to the wall surface 13, so that the incineration ash 10 that has adhered to the wall surface 13 at a high position can also be removed. In addition, since it is not necessary to carry a platform for the hydraulic excavator 4 into the ash bunker 1 to remove the incineration ash 10 that has adhered to the wall surface 13 at a high position, the cleaning work of the ash bunker 1 can be performed efficiently.

[0057] Next, a second embodiment of the present invention will be described with reference to Fig. 9. The same components as those in the first embodiment are given the same reference numerals and the description thereof will be omitted.

[0058] In the first embodiment, the overhead crane 2 was used to place the hydraulic excavator 4 in the ash bunker 1, but in the second embodiment, a crawler crane 102 is used to move the hydraulic excavator 4 into the ash bunker 1. Depending on the ash bunker 1, the overhead crane 2 may be small and may not have enough power to lift the hydraulic excavator 4. In the second embodiment, the hydraulic excavator 4 can be placed in the ash bunker 1 regardless of the power of the overhead crane 2.

[0059] Incineration ash 10 is transported from a conveyor (not shown) to the ash bunker 1 and piled up inside. The left side wall 13 of the ash bunker 1 is smooth, and the right side wall 13 has an opening 101a that communicates with the outside.

[0060] The crawler crane 102 is self-propelled and has a boom 121, a control unit 122, and a hook 123. As shown by the dotted line in Fig. 9, with the boom 121 held in the lowest position, the hydraulic excavator 4 placed on the floor surface 20A is fixed to the hook 123 using a wire, a chain block, and a shackle. Specifically, the arm 42 of the hydraulic excavator 4 is fixed to the hook 123 at least at two points, and the control unit 43 is fixed to the hook 123 at least at two points.

[0061] The hydraulic excavator 4 is lifted slightly from the floor surface 20A, the boom 121 is extended to move the hydraulic excavator 4 into the ash bunker 1, and the hook 123 is lowered to place the hydraulic excavator 4 on the incineration ash 10. After that, the cleaning work of the ash bunker 1 is performed according to the flowchart shown in FIG.

[0062] With this configuration, even if the hydraulic excavator 4 cannot be moved to the ash bunker 1 by the overhead crane 2, the hydraulic excavator 4 can be placed in the ash bunker 1 by the crawler crane 102. This enables efficient cleaning work of the ash bunker 1 using the hydraulic excavator 4.

[0063] According to this configuration, the hydraulic excavator 4, which can be self-propelled by the crawler crane 102, is placed in the ash bunker 1 and the incineration ash 10 is removed using the hydraulic excavator 4, so that the cleaning work of the ash bunker 1 can be performed efficiently. In particular, when the ash bunker 1 is deep from top to bottom and the incineration ash 10 that has adhered to the bottom and hardened reaches a depth of several meters, even if the worker 30 uses a sandblasting machine or other work equipment by hand, it is very inefficient and requires a lot of manpower. In contrast, in the present invention, the hardened incineration ash 10 can be removed and collected using the hydraulic excavator 4, so that the overall work time can be significantly reduced and the cleaning work of the ash bunker 1 can be performed by a small number of people.

[0064] Since the hydraulic excavator 4 is carried in and out of the ash bunker 1 using the crawler crane 102, the hydraulic excavator 4 can be positioned at a desired position within the ash bunker 1. In addition, since the hydraulic excavator 4 is self-propelled, there is no need to move the hydraulic excavator 4 by the crawler crane 102 whenever necessary during work, and therefore the ash bunker 1 can be cleaned efficiently.

[0065] Next, a third embodiment of the present invention will be described with reference to Fig. 10. The same components as those in the above-mentioned embodiment are given the same reference numerals and the description thereof will be omitted.

[0066] In the cleaning method of the ash bunker 1 according to the third embodiment, the hydraulic excavator 4 is carried into the ash bunker 1 by the overhead crane 2 or crawler crane 102 (S1). After the hydraulic excavator 4 is raised to crush the incineration ash 10 stuck to the wall surface 13 at a high place (S4), the gondola 5 is attached to the overhead crane 2 on the floor surface 20A outside the ash bunker 1. The gondola 5 is carried into the ash bunker 1, the overhead crane 2 is stopped near the wall surface 13 to be cleaned, and the gondola 5 is lowered to the bottom surface 12. After the worker 30 gets on the gondola 5, the fence 52 is closed and the gondola 5 is raised to crush and remove the incineration ash 10 in the places that the breaker 45 of the hydraulic excavator 4 cannot reach (S17). At this time, the removal work is performed from the top of the wall surface 13 downward. When the gondola 5 descends to the vicinity of the bottom surface 12 and the removal work up to the bottom is completed, the worker 30 gets off the gondola 5, leaves the gondola 5 unmanned, and raises it again, and moves the overhead crane 2 to an adjacent location.

[0067] The overhead crane 2 is stopped and the gondola 5 is lowered to the bottom surface 12, and the worker 30 is put on the gondola 5 to perform the removal work of the incineration ash 10 from the wall surface 13 from top to bottom again. When the removal work of one wall surface 13 is completed in this way, the overhead crane 2 is moved to move to the other wall surface 13. By repeating this, the removal work of the incineration ash 10 from all four wall surfaces 13 is performed. In the ash bunker 1 that is deep vertically, the breaker 45 of the hydraulic excavator 4 may not reach even if the incineration ash 10 is piled up from the bottom surface 12. According to the cleaning method of the third embodiment, the worker 30 on the gondola 5 attached to the overhead crane 2 can remove the incineration ash 10 stuck to the wall surface 13 at a high place using a breaker, electric hammer, etc. The breaker, electric hammer, etc. are examples of the removal device of the present invention.

[0068] When the removal of the incineration ash 10 from all four wall surfaces 13 is completed, the worker 30 is removed from the gondola 5, the gondola wire 53 is wound up, the overhead crane 2 is moved, the gondola 5 is removed from the ash bunker 1, and the gondola 5 is removed from the overhead crane 2 on the floor surface 20A (S8), and the bottom surface 12 is washed (S9). Finally, the hydraulic excavator 4 is removed from the ash bunker 1 using the overhead crane 2, and the cleaning work of the ash bunker 1 is completed (S5).

[0069] According to this configuration, the overhead crane 2 is stopped near the wall surface 13, the gondola 5 is moved up and down, and the worker 30 removes the incineration ash 10 stuck to the wall surface 13 with a breaker or a chipping tool such as an electric hammer, so the distance between the gondola 5 and the wall surface 13 can be adjusted as desired by placing the overhead crane 2 at a desired position. This allows the worker 30 on the gondola 5 to be separated from the wall surface 13, and the deterioration of the working environment due to the rebound when the incineration ash 10 stuck to the wall surface 13 is removed with a breaker can be suppressed.

[0070] Next, a fourth embodiment of the present invention will be described with reference to Fig. 11. The same components as those in the above-mentioned embodiment will be given the same reference numerals and the description thereof will be omitted.

[0071] In the cleaning method of the ash bunker 1 according to the fourth embodiment, the work of removing the incineration ash 10 by piling up the incineration ash 10 with the breaker 45 of the hydraulic excavator 4 is omitted, and the gondola 5 is attached to the overhead crane 2, and the work of crushing and removing the incineration ash 10 in places that the breaker 45 of the hydraulic excavator 4 cannot reach is performed as in the third embodiment (S17). In other words, S3 and S4 are omitted in FIG. 10. In the ash bunker 1 that is deep vertically, the breaker 45 of the hydraulic excavator 4 may not reach even if the incineration ash 10 is piled up from the bottom surface 12. According to the cleaning method of the third embodiment, the worker 30 on the gondola 5 attached to the overhead crane 2 can remove the incineration ash 10 that has adhered to the wall surface 13 at a high place using a breaker, electric hammer, or the like.

[0072] Next, a fifth embodiment of the present invention will be described with reference to Fig. 12 to Fig. 14. The same components as those in the above-mentioned embodiment will be given the same reference numerals and will not be described. In the following description, the movement of the overhead crane 2 in the front-rear direction in the plan view shown in Fig. 13 will be referred to as "traveling", and the movement of the crane unit 322 of the overhead crane 2 in the left-right direction will be referred to as "traverse". In addition, stopping the overhead crane 2 means a state in which all operations are stopped, specifically, the traveling of the overhead crane 2, the traverse of the crane unit 322, the vertical movement of the crane bucket 21, and the opening and closing of the crane bucket 21 are not performed. The left-right direction is an example of a predetermined direction in the present invention, and the front-rear direction is an example of an orthogonal direction in the present invention.

[0073] In the cleaning method for the ash bunker 1 according to the fifth embodiment, in steps S6 to S8 and S17, the gondola 5 is fixed to the garter 323 of the overhead crane 2, rather than to the support part 23 of the overhead crane 2. As shown in Fig. 12, the overhead crane 2 is composed of a crane part 322, a garter 323, and a traveling rail 330. The crane part 323 has a crane bucket 21, a drive part 22, a support part 23, a suspending wire 24, and a crane drive part 321 that moves up, down, left and right.

[0074] The crane driving unit 321 is composed of a hoisting motor that hoists the crane bucket 21 etc., and a traverse motor for the crane unit 322. The garter 323 can move in the front-to-rear direction by a motor (not shown), and has a width sufficient for the worker 30 to walk in the front-to-rear direction. The garter 323 has a traverse rail 324, a handrail 325, and a bottom net 326. The traverse rail 324 is a rail along which the crane unit 322 travels, and is provided to extend in the left-to-right direction.

[0075] The handrail 325 is provided to prevent the worker 30 from falling when walking on the girder 323, as shown in FIG. 12. The bottom net 326 is configured to have approximately the same length as the lateral rail 324, as shown in FIG. 13. A fixing jig 340 for supporting the gondola 5 is detachably provided on the bottom net 326. The fixing jig 340 is configured by welding a plurality of pipes or steel materials. The fixing jig 340 is configured by a first fixing jig 341 for cleaning the wall surface 13 in the front-rear direction shown in FIG. 13, and a second fixing jig 342 for cleaning the wall surface 13 in the left-right direction shown in FIG. 14.

[0076] The first fixing jig 341 shown in Fig. 13 has two first hooking parts 341A for hooking the gondola wire 53 with a shackle, which are provided at two positions spaced apart in the left-right direction and protrude downward. As a result, the gondola 5 is supported by the first fixing jig 341 at least at two positions on the left and right ends, and can move up and down stably. In addition, when cleaning the wall surface 13 in the front-rear direction, the longitudinal direction of the gondola 5 and the front and rear wall surfaces 13 are parallel, so that the cleaning work can be performed efficiently.

[0077] The second fixing jig 342 shown in FIG. 14 has two second hooking parts 342A for hooking the gondola wire 53 with a shackle, which are provided at two locations so as to protrude downward at a distance in the front-rear direction. As a result, the gondola 5 is supported by the first fixing jig 341 at least at two locations at the front-rear end, so that it can stably move up and down. In addition, when cleaning the wall surface 13 in the left-right direction, the longitudinal direction of the gondola 5 and the left-right wall surfaces 13 are parallel, so that cleaning work can be performed efficiently. Note that the attachment and detachment of the gondola wire 53 to the fixing jig 340 is performed by the first hooking part 341A and the second hooking part 342A, but is not limited to this. For example, a winding device may be installed on the bottom net 326, and the gondola wire 53 may be lowered from above to below to attach and detach the gondola wire 53 near the deck 51.

[0078] Next, a method for cleaning the front, rear, left and right wall surfaces 13 according to the fifth embodiment will be described with reference to Figures 13 and 14. In the figures, the incineration ash 10 adhered to the wall surface 13 is omitted for the sake of explanation.

[0079] When cleaning the wall surface 13 in the front-rear direction shown by diagonal lines in Fig. 13, the ceiling crane 2 is driven and stopped at a position several meters away from the front wall surface 13. As shown by solid lines in the figure, the first fixing jigs 341 are fixed to both ends of the bottom net 326 in the left-right direction. At this time, the first hook parts 341A are fixed so as to be separated in the left-right direction. With the gondola 5 placed on the bottom surface 12, the gondola wire 53 is fixed to the first hook parts 341A.

[0080] The workers 30 get into the gondolas 5 at both the left and right ends, move the gondolas 5 upward, and remove the incineration ash 10 stuck to the front wall surface 13 from top to bottom with a chipping tool such as a breaker. When the removal work is completed to the bottom of the wall surface 13, the workers 30 get off the gondola 5 with the gondola 5 placed on the bottom surface 12, and separate the gondola wire 53 and the first hooking part 341A. With nothing fixed to the first fixing jig 341, the workers 30 move each first fixing jig 341 inward in the left and right direction as shown by the dotted lines. Then, the gondola wire 54 is hooked to the first hooking part 341A again, the workers 30 get into the gondola 5, and clean the area next to the wall surface 13 that has been cleaned from top to bottom. By repeating such work, the cleaning work of the incineration ash 10 on the front wall surface 13 is performed.

[0081] When the cleaning work on the front wall surface 13 is completed, the gondola 5 is placed on the bottom surface 12, the first hook part 341A is separated from the gondola wire 53, and the overhead crane 2 is moved to a position several meters in front of the rear wall surface 13 as shown by the dotted line. Thereafter, the same cleaning work as for the front wall surface 13 is performed. Note that if the worker 30 has dismounted from the gondola 5, the gondola 5 may be placed on the bottom surface 12, the gondola wire 53 may be sufficiently slackened, and the first fixing jig 341 may be moved inward in the left-right direction.

[0082] When cleaning the wall surfaces 13 in the left and right directions indicated by diagonal lines in Fig. 14, the ceiling crane 2 is driven and stopped at a position several meters away from the previous wall surface 13. As indicated by solid lines in the figure, the second fixing jigs 342 are fixed to both ends of the bottom net 326 in the left and right directions. At this time, the second hook portions 342A are fixed so as to be spaced apart in the front-rear direction. In this state, the gondola 5 is placed on the bottom surface 12, and the gondola wire 53 is fixed to the first hook portion 341A.

[0083] The worker 30 gets into the gondola 5 at both the left and right ends, moves the gondola 5 upward, and removes the incineration ash 10 stuck to the left and right wall surfaces 13 from top to bottom with a chipping tool such as a breaker. When the removal work is completed to the bottom of the wall surface 13, the worker 30 gets off the gondola 5 with the gondola 5 placed on the bottom surface 12, and separates the gondola wire 53 from the second hook part 342A. With nothing fixed to the second fixing jig 342, the overhead crane 2 is moved backward on the traveling rail 330 by the width of the garter 323 in the front-rear direction. The gondola wire 54 is hooked again to the second hook part 342A, and the area next to the wall surface 13 that has been cleaned is cleaned from top to bottom. In this way, the overhead crane 2 is moved while traveling to the rear end of the left-right wall surface 13 shown by the dotted line, and the cleaning work of the left-right wall surface 13 is performed.

[0084] According to this configuration, since the second fixing jigs 342 are provided on both left and right ends, the walls on both left and right ends can be cleaned at once just by traveling the overhead crane 2. This reduces the time required to clean the ash bunker 1 and allows for efficient cleaning work.

[0085] According to this configuration, since the gondola 5 is fixed to the garter 323 of the overhead crane 2, the position where the gondola 5 is suspended can be changed by the travel of the overhead crane 2. This allows efficient removal of the incineration ash 10 from the wall surface 13. In addition, since the gondola 5 is fixed to the garter 323 at least at two points, it is possible to prevent the gondola 5 from falling.

[0086] According to this configuration, the gondola 5 is fixed to the fixing jig 340 provided on the girder 323 for cleaning, and the position where the gondola 5 is suspended can be changed by moving the fixing jig 340. This allows efficient removal of the incineration ash 10 from the wall surface 13. In addition, since the wall surface parallel to the left and right directions can be cleaned by the simple method of moving the fixing jig 340, more efficient cleaning of the ash bunker 1 can be achieved than when the scaffolding 201 is set up as shown in FIG. 16.

[0087] According to this configuration, the gondola 5 is fixed to the fixing jig 340 provided on the girder 323 for cleaning work, and the position where the gondola 5 is suspended can be changed by traveling the overhead crane 2. This allows efficient removal of the incineration ash 10 from the wall surface 13. In addition, since the wall surface perpendicular to the left and right direction can be cleaned by the simple method of traveling the overhead crane 2, it is possible to realize efficient cleaning work of the ash bunker 1 compared to the case where the scaffolding 201 is set up as shown in FIG. 16.

[0088] The method for cleaning an ash bunker and the gondola used for cleaning according to the present invention are not limited to the above-described embodiment, and various modifications are possible within the scope of the gist of the invention described in the claims.

[0089] In the above embodiment, a deck-type gondola is used as the gondola 5, but the present invention is not limited to this. For example, a chair-type gondola, a suspended gondola, or an arm-elevating gondola suspended from the hydraulic excavator 4 may be used.

[0090] In the above embodiment, the gondola 5 is suspended from the overhead crane 2 using the gondola wire 53, but this is not limiting. Steel materials such as metal hollow pipes may be used instead of the gondola wire 53. This makes it possible to prevent the gondola 5 from swinging due to inertial force when the overhead crane 2 moves, so that the gondola 5 can be moved in a stable state.

[0091] In the above embodiment, the gondola 5 is hung from the overhead crane 2 and the worker 30 cleans the wall surface 13 with the high-pressure cleaner 40, but this is not limited to the above. If the hydraulic excavator 4 cannot reach the incineration ash 10 on the high wall surface 13 even if the incineration ash 10 is piled up on the bottom surface 12 as shown in FIG. 5, the worker 30 on the gondola 5 hung from the overhead crane 2 may remove the incineration ash 10 stuck to the wall surface 13 with a breaker, electric hammer, or the like. This allows cleaning work to be performed without constructing scaffolding even on a high wall surface 13 that the hydraulic excavator 4 cannot reach. The breaker, electric hammer, and the like are examples of the cleaning machine of the present invention.

[0092] In the fifth embodiment, the gondola wire 53 and the fixing jig 340 are separated when the fixing jig 340 is moved, but this is not limited to the above. For example, the worker 30 may move the fixing jig 340 while the gondola 5 is placed on the bottom surface 12, sufficiently slacken the gondola wire 53, and then move the gondola 5 directly below the fixing jig 340 and wind up the gondola wire 53, thereby moving the gondola 5 in the left-right direction. This eliminates the need to separate the fixing jig 340 and the gondola wire 53, improving work efficiency.

[0093] In the fifth embodiment, the gondola wires 53 are fixed to the garters 323 by the fixing jig 340, but the present invention is not limited to this. For example, the gondola wires 53 may be fixed directly to the garters 323 by a wire or the like without using the fixing jig 340. [Explanation of symbols]

[0094] 1 Ash Bunker 2. Overhead crane 3 bottom stone 4. Hydraulic excavator 5. Gondola 10 Incineration ash 11 Drain 12 Bottom 13 Wall 20 Storage section 21 Crane Bucket 22 Drive unit 30 Worker 41 Bucket 45 Breaker 46 Net Bucket 51 Deck 52 Fence 53 Gondola Wire 101a Passageway 102 Rough Terrain Crane 322 Crane Department 323 Garter 340 Fixture 341 First Fixture 342 Second Fixture

Claims

1. A method for cleaning incineration ash adhering to a wall surface of an ash bunker equipped with an overhead crane, comprising the steps of: positioning the overhead crane near the wall surface; A step of fixing a gondola that can be boarded by a worker and can move up and down to the overhead crane; A step of removing the incineration ash adhering to the wall surface by a removal device while moving the gondola up and down with the ceiling crane stopped; and removing the gondola from the overhead crane.

2. releasing the gondola from the overhead crane and placing the gondola on the bottom surface of the ash bunker; moving the overhead crane a predetermined distance from an existing position; A step of fixing the gondola placed on the bottom surface to the overhead crane again; The method for cleaning an ash bunker as described in claim 1, further comprising the step of removing the incineration ash adhering to the wall surface by the removal device while moving the gondola up and down with the ceiling crane stopped.

3. The ceiling crane has a crane unit having a bucket for discharging the incineration ash, and a girder that holds the crane unit so that it can move laterally in a predetermined direction and can travel in a direction perpendicular to the predetermined direction, 2. A method for cleaning an ash bunker as claimed in claim 1, characterized in that said gondola is fixed to said garter at at least two points.

4. The gondola is fixed to a fixing jig provided on the garter, When cleaning the wall surface that is parallel to the predetermined direction in a plan view, the ceiling crane is stopped near the wall surface, Fixing the gondola to the fixture; A step of removing the incineration ash adhering to the wall surface by a removal device while moving the gondola up and down with the ceiling crane stopped; releasing the gondola from the fixing jig and placing the gondola on the bottom surface of the ash bunker; moving the fixture from an existing position on the girder in the predetermined direction; a step of fixing the gondola placed on the bottom surface to the fixing jig again; The method for cleaning an ash bunker according to claim 3, further comprising the step of removing the incineration ash adhering to the wall surface while moving the gondola up and down with the ceiling crane stopped.

5. The gondola is fixed to a fixing jig provided on the garter, When cleaning the wall surface parallel to the orthogonal direction in a plan view, the ceiling crane is stopped near the wall surface, Fixing the gondola to the fixture; A step of removing the incineration ash adhering to the wall surface by a removal device while moving the gondola up and down with the ceiling crane stopped; releasing the gondola from the fixing jig and placing the gondola on the bottom surface of the ash bunker; A step of traveling the overhead crane a predetermined distance; a step of fixing the gondola placed on the bottom surface to the fixing jig again; The method for cleaning an ash bunker according to claim 3, further comprising the step of removing the incineration ash adhering to the wall surface while moving the gondola up and down with the ceiling crane stopped.

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