Ash bunker cleaning method

Abstract

To provide an ash bunker cleaning method that pulverizes combustion ashes firmly adhered to a wall surface and a bottom surface of an ash planting banker, and can efficiently clean the interior thereof.SOLUTION: A cleaning method for an ash banker 1 cleans combustion ashes 10 firmly adhered to the wall surface 13 and the bottom surface 12 of the ash banker 1 on which an overhead crane 2 is installed. The cleaning method has: a step at which a hydraulic shovel 4 is fixed to the overhead crane 2; a step at which the hydraulic shovel 4 is placed in the ash banker 1 by moving the overhead crane 2; a step at which the combustion ashes 10 firmly adhered to the wall surface 13 and the bottom surface 12 of the ash banker 1 are removed by the hydraulic shovel 4; a step at which the combustion ashes 10 from the ash banker 1 to the outside; a step at which the hydraulic shovel 4 is fixed to the overhead crane 2; and a step at which the hydraulic shovel 4 is taken out from the ash banker 1 by moving the overhead crane 2.SELECTED DRAWING: Figure 3

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 for temporarily storing incineration ash, and are installed in incineration facilities such as waste incineration plants. 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 there is concern that the equipment may deteriorate, 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 walls 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 processing of the sandblasted ash is also a burden.

[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 hardened and accumulated over a long period of time, as in an ash bunker.

[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 scaffolding 201 on the wall as shown in Figure 12. In addition, the piled up incineration ash was removed using sandblasting and various electric tools such as hammers and breakers, which required a lot of manpower and a huge amount of time.

[0010] 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. 13. 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. However, when working with the gondola 202, it was difficult to perform high-pressure washing away from the wall surface 13. 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 perform high-pressure washing was using a scaffold 201, which took time and cost to install.

[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 crush incineration ash adhered 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 walls and bottom of an ash bunker in which an overhead crane is installed is provided, the method comprising the steps of: fixing a self-propelled construction machine to the overhead crane; placing the construction machine in the ash bunker by moving the overhead crane; removing the incineration ash adhered to the walls and bottom of the ash bunker using the construction machine; removing the incineration ash from the ash bunker; fixing the construction machine to the overhead crane; and removing the construction machine from the ash bunker by moving the overhead crane.

[0014] It is also preferable that the construction heavy machine is a hydraulic excavator, and when the hydraulic excavator is fixed to the overhead crane, the arm of the hydraulic excavator is fixed at at least two points and the body of the hydraulic excavator is fixed at at least two points.

[0015] In another aspect of the present invention, there is provided a method for cleaning incineration ash adhering to the walls and bottom of an ash bunker having an access opening communicating with the outside, comprising the steps of: fixing a self-propelled construction machine to the hook of a crane vehicle; moving the construction machine into the ash bunker by extending the boom of the crane vehicle from the access opening into the ash bunker; placing the construction machine in the ash bunker by lowering the hook; removing the incineration ash adhering to the walls and bottom of the ash bunker by the construction machine; removing the incineration ash from the ash bunker; fixing the construction machine to the hook; and removing the construction machine from the ash bunker by raising the hook, shortening the boom and moving it through the access opening.

[0016] It is also preferable that the method includes the steps of piling up the incineration ash in the ash bunker, moving the construction machine onto the piled up incineration ash, and removing the incineration ash adhering to the wall surface by the construction machine. Effect of the Invention

[0017] According to this configuration, a self-propelled construction machine is placed in the ash bunker by an overhead crane and the incineration ash is removed using the construction machine, so that the cleaning work of the ash bunker can be performed efficiently. In particular, when the ash bunker is deep and the incineration ash that has adhered to the bottom and hardened reaches a depth of several meters, even if workers use sandblasting 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 can be removed and collected using construction machines, so the overall work time can be significantly reduced and the cleaning work of the ash bunker can be performed by a small number of people.

[0018] Since the construction machinery is carried in and out of the ash bunker using an overhead crane, it can be positioned at a desired position in the ash bunker. Also, since the construction machinery is self-propelled, there is no need to use an overhead crane to move the construction machinery whenever necessary during work, and the ash bunker can be cleaned efficiently.

[0019] According to this configuration, the hydraulic excavator is fixed to the overhead crane at at least two points on the arm and at least two points on the body, so that the hydraulic excavator can be prevented from losing its position or falling while the overhead crane is moving. In addition, because the construction machine is a hydraulic excavator, it can also demolish incineration ash that has adhered to the wall at a high position by driving the arm.

[0020] According to this configuration, a construction machine that can be driven by a crane is placed in the ash bunker and the incineration ash is removed using the construction machine, so that the cleaning work of the ash bunker can be performed efficiently. In particular, when the ash bunker is deep and the incineration ash that has adhered to the bottom and hardened reaches a depth of several meters, even if workers use sandblasting 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 can be removed and collected using construction machines, so the overall work time can be significantly reduced and the cleaning work of the ash bunker can be performed by a small number of people.

[0021] Since the construction machinery is transported in and out of the ash bunker using a crane, it can be positioned at a desired position in the ash bunker. Also, since the construction machinery is self-propelled, there is no need to move the construction machinery with a crane every time during work, so the ash bunker can be cleaned efficiently.

[0022] According to this configuration, the construction machine is moved over the piled up incineration ash to remove the incineration ash that has adhered to the wall, so that the incineration ash that has adhered to the wall at a high position can also be removed. In addition, since it is not necessary to bring a platform for the construction machine to climb into the ash bunker in order to remove the incineration ash that has adhered to the wall at a high position, the cleaning work of the ash bunker can be performed efficiently.

[0023] This makes it possible to provide a method for cleaning an ash bunker that can crush incineration ash adhering 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 using a breaker by 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 the work stage is suspended from an overhead crane in the ash bunker according to the first embodiment of the present invention and the wall surface is washed. [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. 1 shows how scaffolding is set up in a conventional ash bunker to remove incineration ash. [Figure 13] 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 break up 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 an operator at the control unit 43. The crawlers 44 enable the hydraulic excavator 4 to move within the ash bunker 1. The control unit 43 is an example of the main body of the present invention.

[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 height is gained by the incineration ash 10 collected near the wall surface 13, 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 surface 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 tools such as a high-pressure washer and 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] 8, the work stage 5 is attached to the crane bucket 21, and the wall surface 13 is cleaned by the high-pressure washer 40. The work stage 5 is a deck-type stage, and is composed of a deck 51, a fence 52, and a stage wire 53.

[0042] The deck 51 is generally rectangular when viewed from above and larger than the crane bucket 21, with a fence 52 provided around the periphery to prevent falls. The deck 51 is large enough for two to three workers 30 to ride on, and can accommodate the high-pressure washer 40. A cushion material 51A is provided on the lower part of the deck 51, protruding outward around the entire periphery. The cushion material 51A can reduce damage to the wall surface 13 when the work stage 5 comes into contact with the wall surface 13.

[0043] When attaching the work stage 5 to the crane bucket 21, as shown by the dotted line in Fig. 8, the work stage 5 is placed on the floor surface 20A, the crane bucket 21 is brought close to the work stage 5, and the stage wires 53 are suspended from the hooks 23A provided on the support parts 23. At this time, the work stage 5 and the ceiling crane 2 are suspended by the stage wires 53 at least at the four corners of the deck 51. The stage wires 53 are suspended by at least two of them at one point so that the work stage 5 will not fall even if they are cut (S6). Note that a chain block or the like may be used in addition to the stage wires 53 to adjust the length of the stage wires 53.

[0044] After the overhead crane 2 and the work stage 5 are fixed with the stage wire 53, the overhead crane 2 is moved into the ash bunker 1 as shown by the arrow in the figure. The work stage 5 is placed on the bottom surface 12, and the worker 30 gets on to the work stage 5, and the wall surface 13 is washed with the high-pressure washer 40 (S7).

[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 work stage 5 can high-pressure wash all four wall surfaces 13. In this case, it is preferable to perform the high-pressure washing from the top of the wall surfaces 13 down to the bottom.

[0047] When all wall surfaces 13 are completed, the worker 30 is lowered from the work stage 5, and as shown by the dotted line in Fig. 8, the overhead crane 2 is moved to remove the work stage 5 from the ash bunker 1, and the work stage 5 is placed on the floor surface 20A. The connection between the support part 23 and the work stage 5 by the stage wire 53 is released, and the work stage 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 also 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 to 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] In particular, in the case of a deep ash bunker 1 with several meters of hardened incineration ash 10 stuck to the bottom surface 12, even if workers used sandblasting or other work equipment by hand, it was very inefficient and required a lot of manpower. In contrast, in the present invention, the hardened incineration ash 10 can be removed and collected using a hydraulic excavator 4, so 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] According to this configuration, the work stage 5 is fixed to the overhead crane 2 and positioned near the wall surface 13 to perform cleaning with the high-pressure cleaner 40, so the distance between the work stage 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 work stage 5 to be separated from the wall surface 13, and the deterioration of the work environment due to the rebound when the wall surface 13 is cleaned with the high-pressure cleaner 40 can be suppressed. In addition, as shown in FIG. 13, compared with the case where a scaffolding 201 is set up to clean a high place 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 work stage 5 as shown in FIG. 8. This allows the cost, manpower, and cleaning period to be shortened compared to the case where a conventional gondola 202 and scaffolding 201 are set up.

[0054] Since the work stage 5 is fixed to the overhead crane 2, it is not necessary to fix the work stage 5 to the wall surface 13 and change the work stage 5 for each wall surface 13, and the work stage 5 can be moved by the overhead crane 2. This allows cleaning work inside the ash bunker 1 to be performed efficiently.

[0055] According to this configuration, the work stage 5 and the overhead crane 2 are fixed to each other at the four corners of the deck 51 by the stage wires 53, so that the work stage 5 can move stably without swinging when the overhead crane 2 moves. Also, since the stage wires 53 are made up of at least two wires at each of the four corners, the work stage 5 can be safely lowered to the bottom surface 12 without tilting, even if one of the stage wires 53 is cut.

[0056] 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.

[0057] 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. The crawler crane 102 is an example of a crane vehicle of the present invention.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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 workers use sandblasting 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.

[0063] 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.

[0064] 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.

[0065] 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 adhering to the high wall surface 13 (S4), the work stage 5 is attached to the overhead crane 2 to crush and remove the incineration ash 10 in places that the breaker 45 of the hydraulic excavator 4 cannot reach (S17). 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 work stage 5 attached to the overhead crane 2 can remove the incineration ash 10 adhering to the high wall surface 13 using a breaker, electric hammer, or the like.

[0066] When the removal of the incineration ash 10 from all four wall surfaces 13 is completed, the work stage 5 is removed from the overhead crane 2 (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).

[0067] 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.

[0068] 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 work stage 5 is attached to the overhead crane 2 to crush and remove the incineration ash 10 in places that the breaker 45 of the hydraulic excavator 4 cannot reach (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 work stage 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, etc.

[0069] The method for cleaning an ash bunker according to the present invention is 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.

[0070] In the above embodiment, a deck-type stage is used as the working stage 5, but this is not limiting. For example, a chair-type stage, a suspended stage, or an arm-elevating stage suspended by the hydraulic excavator 4 may also be used.

[0071] In the above embodiment, the stage wire 53 is used when suspending the working stage 5 from the overhead crane 2, but this is not limiting. Steel materials such as metal hollow pipes may be used instead of the stage wire 53. This makes it possible to prevent the working stage 5 from swinging due to inertial force when the overhead crane 2 moves, so that the working stage 5 can be moved in a stable state.

[0072] In the above embodiment, the work stage 5 is suspended 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 work stage 5 suspended 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. [Explanation of symbols]

[0073] 1 Ash Bunker 2. Overhead crane 3 bottom stone 4. Hydraulic excavator 5 Working Stages 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 Stage Wire 101a Passageway 102 Rough Terrain Crane

Claims

1. A method for cleaning incineration ash adhering to the walls and bottom of an ash bunker equipped with an overhead crane, comprising: A step of fixing a self-propelled construction machine to the overhead crane; placing the construction machine in the ash bunker by moving the overhead crane; Removing the incineration ash adhering to the wall surface and the bottom surface of the ash bunker by the construction machine; Discharging the incineration ash from the ash bunker; Fixing the construction machine to the overhead crane; and removing the construction machine from the ash bunker by moving the overhead crane.

2. The construction machine is a hydraulic excavator, 2. The method for cleaning an ash bunker according to claim 1, characterized in that when the hydraulic excavator is fixed to the overhead crane, it is fixed at at least two points on the arm of the hydraulic excavator and at least two points on the body of the hydraulic excavator.

3. A method for cleaning incineration ash adhering to the wall and bottom surfaces of an ash bunker having an opening communicating with the outside, comprising: Securing a self-propelled heavy construction machine to a hook of a crane vehicle; moving the construction machine into the ash bunker by extending a boom of the crane vehicle from the access opening into the ash bunker; placing the construction machine in the ash bunker by lowering the hook; Removing the incineration ash adhering to the wall surface and the bottom surface of the ash bunker by the construction machine; Discharging the incineration ash from the ash bunker; fastening the construction machine to the hook; and removing the construction machine from the ash bunker by raising the hook, shortening the boom and moving it through the access opening.

4. stacking the incineration ash in the ash bunker; Moving the construction machine onto the piled up incineration ash; The method for cleaning an ash bunker according to any one of claims 1 to 3, further comprising a step of removing the incineration ash adhering to the wall surface by the construction machine.

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