Garbage bunker cleaning method

Abstract

To provide a garbage bunker cleaning method capable of efficiently removing garbage deposited in a garbage bunker to clean the inside.SOLUTION: A method for cleaning a garbage bunker 1 comprises: a step of fixing a self-traveling hydraulic shovel 4 to an overhead crane 2; a step of moving the overhead crane 2 to place the hydraulic shovel 4 in the garbage bunker 1; a step of moving garbage 10 in the hydraulic shovel 4 to expose a bottom surface 12, and placing the hydraulic shovel 4 in the exposed bottom surface 12; a step of forming a passage having the bottom surface 12 on which the hydraulic shovel 4 can travel exposed by moving the garbage 10 in the hydraulic shovel 4; a step of removing the garbage 10 out of the garbage bunker 1; a step of fixing the hydraulic shovel 4 to the overhead crane 2; and a step of moving the overhead crane 2 to take out the hydraulic shovel 4 from the garbage bunker 1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a method for cleaning a garbage bunker, and more particularly to a method for cleaning a garbage bunker that stores garbage. [Background technology]

[0002] Waste bunkers for incinerators are facilities that temporarily store waste before it is burned, and are placed inside incineration facilities such as waste incineration plants. Because waste bunkers accumulate and store large amounts of waste over long periods of time, the moisture contained in the waste causes the waste to accumulate and harden at the bottom. This reduces the waste bunker's storage capacity and can lead to concerns about deterioration of the facility, such as cracks in the walls. Therefore, regular cleaning and maintenance are required, in which all waste inside the waste bunker is removed to expose and clean the walls and bottom.

[0003] The waste bunker attached to a fluidized bed waste incinerator is divided into three sections: a waste input section where collected waste is input, a crushed waste storage section where the waste is crushed using a crusher, and a waste removal section connected to the crushed waste storage section by an inclined plane (Patent Document 1). The crushed waste storage section has a chute with a crusher installed inside, and a required inclined plane from the bottom of the chute to the waste removal section, so that the waste can be burned immediately after being crushed, thereby homogenizing the waste.

[0004] Another waste disposal system is primarily composed of a bunker into which garbage bags are thrown, a conveyor inside the bunker to transport the garbage bags, and a bag-breaking machine. The garbage thrown into the bunker is directly transported by the conveyor to the waste line, where it is crushed, dried, and other processes before being supplied to an incinerator. The supplied garbage is dried and pulverized before being burned, which improves the incinerator's combustion speed, reduces the generation of exhaust gases and harmful substances such as dioxins due to complete combustion, and prevents unpleasant odors from the incinerator. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 7-71736 [Patent Document 2] Japanese Patent Application Laid-Open No. 2002-301400 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the waste disposal systems described in Patent Documents 1 and 2 do not take into consideration the maintenance of the waste bunker. The waste bunker is equipped with an overhead crane, which is used to discharge waste from the bunker, but waste on the bottom or near the walls remains immobile for long periods of time. This is because if the overhead crane is brought too close to the wall or bottom, they may come into contact and damage the wall or the overhead crane.

[0007] Garbage near the walls and bottom is compressed by the weight of the garbage piled on top and hardens due to moisture, etc. Garbage bunkers require regular cleaning and maintenance because the accumulation of immovable garbage on the walls and around the bottom reduces their capacity and moisture penetrates into the walls, etc., accelerating deterioration.

[0008] Because garbage bunkers are deep and garbage piles up high on the walls, workers have traditionally used shovels or power tools to remove garbage 10 from the bottom 12, and then, as shown in Figure 13, they have erected scaffolding 201 on the walls to clean the wall surfaces 13.

[0009] Also, depending on the shape of the garbage bin 1, as shown in FIG. 14, a worker 30 would ride a gondola 202 to perform cleaning work on the wall surface 13. Specifically, the gondola 202 was fixed to the wall surface 13 by hooking a fixing part 221 of the gondola 202 onto a protrusion 220A on the wall surface. In conventional cleaning using the gondola 202, the wall surface 13 and the worker 30 were close to each other, so the cleaning liquid from the high-pressure cleaning reflected off the wall surface 13 and splashed onto the worker 30, creating a poor working environment. Furthermore, because the fixing part 221 was hooked onto the protrusion 220A on the wall surface, it was difficult for the gondola 202 to perform high-pressure cleaning away from the wall surface 13. Walls 13 without fixing parts 221 were flat and therefore could not be hung with the gondola 202. Therefore, the only way to perform high-pressure cleaning was to use scaffolding 201, which required time and cost to install.

[0010] The waste incineration facilities where waste bunkers are installed are in constant operation and it is difficult to shut them down for long periods of time, so operators have been calling for a reduction in the cleaning period. Given these circumstances, there has been a demand for a method to efficiently remove the huge amount of waste on the bottom and walls of the waste bunkers and clean the inside of the bunkers.

[0011] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a method for cleaning a garbage bunker that can efficiently remove garbage from the garbage bunker and clean the inside of the garbage bunker. [Means for solving the problem]

[0012] In order to solve the above problem, a method for cleaning garbage accumulated on the walls and bottom of a garbage bunker equipped with an overhead crane is provided, comprising the steps of: fixing a self-propelled construction machine to the overhead crane; placing the construction machine inside the garbage bunker by moving the overhead crane; exposing the bottom by moving the garbage with the construction machine and placing the construction machine on the exposed bottom; moving the garbage with the construction machine to form a passage with an exposed bottom along which the construction machine can travel; removing the garbage from the garbage bunker; fixing the construction machine to the overhead crane; and removing the construction machine from the garbage bunker by moving the overhead crane.

[0013] According to another aspect of the present invention, there is provided a method for cleaning garbage stuck to the walls and bottom of a garbage bin having an access opening communicating with the outside, the method comprising the steps of: fastening a self-propelled construction machine to the hook of a crane truck; moving the construction machine into the garbage bin by extending the boom of the crane truck from the access opening into the garbage bin; placing the construction machine inside the garbage bin by lowering the hook; using the construction machine to move the garbage to expose the bottom and placing the construction machine on the exposed bottom; using the construction machine to move the garbage to form a passage with the exposed bottom along which the construction machine can travel; removing the garbage from the garbage bin; fastening the construction machine to the hook; and removing the construction machine from the garbage bin by raising the hook, shortening the boom, and moving it through the access opening.

[0014] It is also preferable that the passage be formed along the wall surface of the waste bunker. [Effects of the Invention]

[0015] With this configuration, a self-propelled construction machine can be placed inside the garbage bin using an overhead crane, and the construction machine can be used to collect, recover, and remove the garbage, allowing for efficient garbage bin cleaning work. In particular, when the garbage bin is deep and the garbage piled up at the bottom reaches several meters, even if workers use work equipment, it is extremely inefficient and requires a large number of people. In contrast, with the present invention, the construction machine can collect, recover, and remove the accumulated garbage, significantly reducing the overall work time and allowing the garbage bin cleaning work to be performed by a smaller number of people.

[0016] By moving the garbage, the bottom surface is exposed and construction equipment can be placed there, which makes it more stable than if the construction equipment were placed on top of the garbage. Also, by creating a path that construction equipment can travel on, construction equipment can travel stably inside the garbage bunker. This allows for efficient cleaning work of the garbage bunker.

[0017] With this configuration, a self-propelled construction machine is placed inside the garbage bin using a crane truck and used to collect the garbage, allowing for efficient garbage bin cleaning work. In particular, when the garbage bin is deep and the garbage piled up at the bottom reaches several meters, even if workers use the work equipment, it is very inefficient and requires a lot of manpower. In contrast, with the present invention, the piled garbage can be collected using the construction machine, significantly reducing the overall work time and allowing the garbage bin to be cleaned with fewer people.

[0018] Since a crane truck is used to transport the construction machinery into and out of the garbage bunker, it can be positioned wherever desired within the garbage bunker. Also, since the construction machinery is self-propelled, there is no need to move the construction machinery with a crane truck from time to time during work, which allows for efficient cleaning of the garbage bunker.

[0019] This provides a method for cleaning a garbage bunker that can efficiently remove garbage from the garbage bunker and clean the inside. [Brief explanation of the drawings]

[0020] [Figure 1] 1 is a diagram showing a state in which garbage is collected by an overhead crane in a garbage bunker according to a first embodiment of the present invention. [Figure 2] 3 is a flowchart of a method for cleaning a garbage bunker according to a first embodiment of the present invention. [Figure 3] 1 is a diagram showing a hydraulic excavator being brought into a refuse bunker according to a first embodiment of the present invention using an overhead crane. [Figure 4] 4(a) and 4(b) are diagrams showing a garbage bunker according to the first embodiment of the present invention when a stable position is formed by a hydraulic excavator, where FIG. 4(a) is a diagram showing the garbage bunker from the side, and FIG. 4(b) is a diagram showing the garbage bunker from above. [Figure 5] 1 is a plan view showing a state in which a passage is formed by the scissors of a hydraulic excavator in a refuse bunker according to a first embodiment of the present invention; [Figure 6] FIG. 2 is a plan view of the refuse bunker according to the first embodiment of the present invention, showing a passage formed by a hydraulic excavator. [Figure 7] 1 is a diagram showing a garbage bunker according to a first embodiment of the present invention, in which a gondola is suspended from a support part of an overhead crane to clean a wall surface. [Figure 8] FIG. 10 is a diagram showing a garbage bunker according to a second embodiment of the present invention, when a flexible container containing garbage is being carried out by an overhead crane. [Figure 9] FIG. 10 is a diagram showing a hydraulic excavator being carried in by a crawler crane to a refuse bunker according to a third embodiment of the present invention. [Figure 10] FIG. 10 is a diagram showing a garbage bunker according to a fourth embodiment of the present invention, in which a gondola is suspended from the girder of an overhead crane to remove garbage from the wall. [Figure 11] FIG. 10 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 a garbage bin according to a fourth embodiment of the present invention. [Figure 12] FIG. 10 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 a garbage bin according to a fourth embodiment of the present invention. [Figure 13] A diagram showing how scaffolding is set up to clean the walls of a conventional garbage bin. [Figure 14] A diagram of a conventional garbage bunker in which a gondola is lowered from a wall to perform high-pressure cleaning of the wall. DETAILED DESCRIPTION OF THE INVENTION

[0021] A method for cleaning a garbage bin 1 according to a first embodiment of the present invention will be described with reference to Figures 1 to 7. As shown in the figures, up, down, 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.

[0022] A waste bunker 1 is a facility for temporarily storing waste 10 collected by waste trucks, and is installed inside a building of an incineration facility such as a waste incineration plant. The waste bunker 1 is equipped with an overhead crane 2 for loading, discharging, and stirring the waste 10. The waste 10 inside the waste bunker 1 is discharged by the overhead crane 2 into a hopper 20 installed in the waste bunker 1, and is transported to an incinerator (not shown) as indicated by the arrow. The waste 10 accumulates on the bottom surface 12 of the waste bunker 1 over a long period of time, causing it to harden, making it difficult to discharge to the outside using only the overhead crane 2. Furthermore, if the drain outlet 11 becomes clogged with solidified waste 10, moisture cannot flow out and the layer of accumulated waste 10 hardens, necessitating regular cleaning.

[0023] The overhead crane 2 is bucket-type and is composed of a crane bucket 21, a drive unit 22, a support unit 23, and a suspension wire 24. The overhead crane 2 is a two-axle mobile overhead crane that can move freely in all directions within the space of the garbage bunker 1. 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 it comes into contact with the wall surface 13 while the overhead crane 2 is moving. A claw 21B is provided at the lower end of the crane bucket 21, which allows it to demolish garbage 10 that has hardened to a certain extent.

[0024] The crane bucket 21 is structured to sandwich the waste 10 from the left and right and take it inside, and by closing it, it maintains the state in which the waste 10 is taken inside. Specifically, as shown in Figure 1, the crane bucket 21 is operated so that it is positioned above the piled up waste 10 in an open state, and by closing the crane bucket 21 in the direction of the arrow, the waste 10 is taken inside. In this state, the crane bucket 21 is moved upward and to the right, opening the crane bucket 21 above the hopper 20 and transporting the waste 10 to the next process, the incineration furnace.

[0025] 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 of the overhead crane 2 are performed by an operator in a cab (not shown).

[0026] 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 and 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.

[0027] In this embodiment, a hydraulic excavator 4 is placed inside the waste bunker 1 and cleaning work is performed by breaking up the waste 10 that has accumulated on the bottom surface 12 and wall surfaces 13. As shown in FIG. 3, the hydraulic excavator 4 is composed of a mesh bucket 41, an arm 42, a control unit 43, and crawlers 44. The mesh bucket 41 is detachable from the arm 42 and can be replaced with scissors 45 shown in FIG. 5. The arm 42 is driven by multiple hydraulic cylinders and operated by the worker 30 at the control unit 43. The crawlers 44 enable the hydraulic excavator 4 to move inside the waste bunker 1. By attaching a blade (not shown) to the crawler 44, the waste 10 can be moved by pressing it with the blade.

[0028] A method for cleaning a garbage bunker 1 will be described with reference to Figure 2. In the method for cleaning a garbage bunker 1 of this embodiment, a hydraulic excavator 4, which is a movable heavy construction machine, is placed inside the garbage bunker 1. The heavy construction machine placed in the garbage bunker 1 is not limited to the hydraulic excavator 4, but may also be a wheel loader, bulldozer, skid steer loader, compact track loader, motor grader, mobile crane, etc.

[0029] 3, with crane bucket 21 open, hydraulic excavator 4 placed on floor 20A is secured to crane bucket 21 using wires, chain blocks, shackles, etc. Specifically, arm 42 of hydraulic excavator 4 is secured to hooks (not shown) of crane bucket 21 at least at two points, and control section 43 is secured to hooks (not shown) of crane bucket 21 at least at two points.

[0030] With the hydraulic excavator 4 fixed to the crane bucket 21, as shown by the arrow in Figure 3, the lifting wire 24 is reeled in to lift the hydraulic excavator 4, the overhead crane 2 is moved to move the hydraulic excavator 4 into the garbage bunker 1, and the lifting wire 24 is lowered to place the hydraulic excavator 4 on top of the piled garbage 10 (S1). At this time, the weight of the hydraulic excavator 4 makes it difficult to stabilize it on top of the garbage 10. Therefore, it is desirable to place the hydraulic excavator 4 on top of the garbage 10 that has been smoothed to some extent by a worker 30 in advance.

[0031] As shown in Figures 4(a) and 4(b), the worker 30 operating the hydraulic excavator 4 first removes the garbage 10 around the hydraulic excavator 4 and positions the hydraulic excavator 4 in a stable position 12A where the bottom surface 12 is exposed (S2). Specifically, the worker 30 digs up the garbage 10 using the net bucket 41 of the hydraulic excavator 4 near the wall surface 13 and piles it up in the center. Although not shown in the figures, the garbage bunker 1 may be provided with scaffolding to allow the worker 30 to descend to the bottom surface 12.

[0032] 5 and 6, a worker 30 uses a hydraulic excavator 4 to pile up the waste 10 near the wall 13 in the center of the waste bunker 1, thereby creating a passage 12B along the wall 13 so as to circle the periphery of the waste bunker 1 (S3). This reduces the workload of the process of removing the waste 10 using an overhead crane 2, which will be described later.

[0033] The worker 30 uses the crane bucket 21 to discharge the waste 10 that has been piled up in the center of the waste bunker 1 by the overhead crane 2 to the outside (S4). At this time, the worker 30 uses the hydraulic excavator 4 to collect the waste 10 that has been scattered around when the crane bucket 21 of the overhead crane 2 is opened and closed, into the center.

[0034] After all of the garbage 10 has been discharged from the garbage bunker 1, the hydraulic excavator 4 is removed from the garbage bunker 1 using the overhead crane 2 (S5). Specifically, as with the removal, the crane bucket 21 is opened and the hydraulic excavator 4 placed on the bottom surface 12 is secured to the crane bucket 21 using wires, chain blocks, shackles, etc. The hydraulic excavator 4 is then removed from the garbage bunker 1 by the overhead crane 2 and placed on the floor surface 20A. The hydraulic excavator 4 is removed from the garbage bunker 1 to prevent it from getting wet or submerged in water when the wall surface 13 is high-pressure washed with water, as will be described later.

[0035] Next, as shown in Fig. 7, a gondola 5 is attached to an overhead crane 2, and a high-pressure washer 40 is used to clean a high-level wall surface 13 that cannot be reached from the bottom surface 12. The gondola 5 is a deck-type gondola and is composed of a deck 51, a fence 52, and a gondola wire 53.

[0036] The deck 51 is roughly rectangular when viewed from above and is larger than the crane bucket 21, with a fence 52 attached around the periphery to prevent falls. The deck 51 is large enough for two to three workers 30 to ride on, and can accommodate a high-pressure washer 40. Cushioning material 51A protruding outward is attached to the entire periphery of the lower part of the deck 51. The cushioning material 51A reduces damage to the wall surface 13 when the gondola 5 comes into contact with the wall surface 13. The gondola wire 53 can be wound up by a winding machine (not shown), thereby changing the height of the gondola 5. The worker 30 on the bottom surface 12 moves the gondola 5 up and down by winding the gondola wire 53 using a wireless remote control.

[0037] When attaching the gondola 5 to the crane bucket 21, as shown by the dotted line in FIG. 7 , the gondola 5 is placed on the floor 20A, the crane bucket 21 is brought close to the gondola 5, and the gondola wire 53 is suspended from the hook 23A provided on the support part 23. At this time, the gondola 5 and the overhead crane 2 are suspended by the gondola wire 53 at least at the four corners of the deck 51. The gondola wire 53 is suspended by at least two gondola wires 53 at one point so that the gondola 5 will not fall even if it is cut (S6). Note that a chain block or the like may be used in addition to the gondola wire 53 to adjust the length of the gondola wire 53. Note that when the gondola 5 is fixed to the overhead crane 2, the gondola wire 53 is set to its shortest length.

[0038] After the overhead crane 2 and gondola 5 are secured with the gondola wire 53, the overhead crane 2 is moved into the garbage 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 remaining stopped. Specifically, the worker 30 uses a wireless remote control to lower the gondola 5 and place it on the bottom surface 12, then the worker 30 gets into the gondola 5, closes the fence 52, and raises the gondola 5 to perform the washing work.

[0039] When the worker 30 washes the wall surface 13 with the high-pressure washer 40, the overhead crane 2 is positioned 2 to 3 m away 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, thereby improving the working environment for the worker 30.

[0040] When cleaning of a given wall surface 13 has been completed from top to bottom, the gondola 5 is placed on the bottom surface 12 and the worker 30 gets out of the gondola 5. The worker 30 separates the gondola wire 53 from the deck 51. With the gondola 5 and the overhead crane 2 completely separated, the overhead crane 2 is moved to the vicinity of the wall surface 13 that is the target of cleaning work. Specifically, the overhead crane 2 is moved along the wall surface 13 by the width of the deck 51. The worker 30 carries the gondola 5 to directly below the crane bucket 21 and secures the gondola wire 53 to the deck 51. In other words, when the overhead crane 2 moves, the gondola wire 53 and the deck 51 are separated.

[0041] When all 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 the shortest, and as shown by the dotted line in Figure 7, the overhead crane 2 is moved to eject the gondola 5 from the garbage bunker 1 and place the gondola 5 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).

[0042] 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 surface 12, thereby completing the cleaning work of the garbage bunker 1.

[0043] With this configuration, the hydraulic excavator 4, which is self-propelled by the overhead crane 2, removes the trash 10 placed inside the trash bunker 1, allowing for efficient cleaning of the trash bunker 1. In particular, when the trash bunker 1 is deep and the trash 10 piled up on the bottom 12 reaches several meters, it is extremely inefficient for the worker 30 to use a shovel or other work equipment by hand, requiring a large number of people. In contrast, with the present invention, the hydraulic excavator 4 can be used to remove and gather the piled up trash 10, significantly reducing the overall work time and allowing the trash bunker 1 to be cleaned with a smaller number of people.

[0044] With this configuration, a hydraulic excavator 4 that can be self-propelled by an overhead crane 2 is placed inside the garbage bunker 1, and the hydraulic excavator 4 is used to collect, recover, and remove the garbage 10, allowing for efficient cleaning of the garbage bunker 1. In particular, when the garbage bunker 1 is deep and the garbage 10 piled up on the bottom surface 12 reaches a depth of several meters, even if the worker 30 uses a shovel or the like, it is very inefficient and requires a lot of manpower. In contrast, with the present invention, the hydraulic excavator 4 can be used to collect the piled up garbage 10, significantly reducing the overall work time and allowing the garbage bunker 1 to be cleaned with a smaller number of people.

[0045] By moving the waste 10, the bottom surface 12 is exposed and the hydraulic excavator 4 is placed thereon, which makes it more stable than when the hydraulic excavator 4 is placed on top of the waste 10. Also, since a passage 12B along which the hydraulic excavator 4 can travel is formed, the hydraulic excavator 4 can travel stably inside the waste bunker 1. This allows the work of cleaning the waste bunker 1 to be carried out efficiently.

[0046] Next, a second embodiment of the present invention will be described with reference to Fig. 8. The same components as those in the first embodiment will be given the same reference numerals and the description thereof will be omitted.

[0047] In the first embodiment, when cleaning the garbage bunker 1, the garbage 10 inside the garbage bunker 1 was removed using an overhead crane 2, but in the second embodiment, when cleaning the garbage bunker 1, the garbage 10 is packed into a flexible container 50 and removed.

[0048] The worker 30 replaces the tip of the hydraulic excavator 4 with scissors 45, clamps the waste 10, and stuffs it into a flexible container 50. The worker 30 hooks multiple flexible containers 50 onto the claws 21B and discharges them onto the floor 20A using the overhead crane 2. The flexible containers 50 discharged onto the floor 20A are transported to a predetermined location by a delivery vehicle (not shown).

[0049] With this configuration, the garbage 10 is discharged outside the garbage bunker 1 while still in the flexible container 50, so that the garbage 10 does not scatter around after being discharged from the garbage bunker 1, and the workload during handling is reduced.

[0050] Next, a third embodiment of the present invention will be described with reference to Fig. 9. The same components as those in the above-described embodiment will be given the same reference numerals and the description thereof will be omitted.

[0051] In the first embodiment, an overhead crane 2 was used to place the hydraulic excavator 4 into the garbage bunker 1, but in the third embodiment, a crawler crane 102 is used to move the hydraulic excavator 4 into the garbage bunker 1. Depending on the garbage bunker 1, the overhead crane 2 may be small and may not have enough power to lift the hydraulic excavator 4. In the third embodiment, the hydraulic excavator 4 can be placed inside the garbage bunker 1 regardless of the power of the overhead crane 2.

[0052] Garbage 10 is discharged from a garbage truck and piled up inside the garbage bunker 1. The left wall surface 13 of the garbage bunker 1 is smooth, and the right wall surface 13 has an inlet 101a through which the garbage truck puts the garbage 10.

[0053] 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 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 two points, and the control unit 43 is fixed to the hook 123 at least two points.

[0054] 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 garbage bunker 1, and the hook 123 is lowered to place the hydraulic excavator 4 on the garbage 10. Thereafter, cleaning work of the garbage bunker 1 is carried out according to the flowchart shown in FIG.

[0055] With this configuration, even if the hydraulic excavator 4 cannot be moved to the garbage bunker 1 by the overhead crane 2, the hydraulic excavator 4 can be positioned inside the garbage bunker 1 by the crawler crane 102. This enables efficient cleaning work of the garbage bunker 1 using the hydraulic excavator 4.

[0056] With this configuration, a hydraulic excavator 4 that can be self-propelled by a crawler crane 102 is placed inside the garbage bunker 1 and used to collect, recover, and remove the garbage 10, allowing for efficient cleaning of the garbage bunker 1. In particular, when the garbage bunker 1 is deep and the garbage 10 piled up on the bottom 12 reaches a depth of several meters, even if the worker 30 uses a shovel or other work equipment, it is very inefficient and requires a large number of people. In contrast, with the present invention, the hydraulic excavator 4 can be used to collect the piled garbage 10, significantly reducing the overall work time and allowing the garbage bunker 1 to be cleaned with a smaller number of people.

[0057] The hydraulic excavator 4 is transported into and out of the garbage bunker 1 using the crawler crane 102, so the hydraulic excavator 4 can be positioned at a desired position within the garbage bunker 1. In addition, because the hydraulic excavator 4 is self-propelled, there is no need to move the hydraulic excavator 4 with the crawler crane 102 as needed during work, and the garbage bunker 1 can be cleaned efficiently.

[0058] Next, a fourth embodiment of the present invention will be described with reference to Figures 10 to 12. Components that are the same as those in the above-mentioned embodiments will be assigned the same reference numerals and will not be described again. In the following description, in the plan view shown in Figure 11, the movement of the overhead crane 2 in the forward and backward directions will be referred to as "traveling," and the movement of the crane unit 322 of the overhead crane 2 in the left and right directions will be referred to as "traverse movement." Furthermore, stopping the overhead crane 2 refers to a state in which all operations are stopped, and specifically refers to a state in which the traveling of the overhead crane 2, the traverse movement 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 taking place.

[0059] In the method for cleaning a garbage bunker 1 according to the fourth embodiment, in steps S6 to S8, the gondola 5 is fixed to the girder 323 of the overhead crane 2 rather than to the support part 23 of the overhead crane 2. As shown in Figures 10 and 11, the overhead crane 2 is composed of a crane part 322, a girder 323, and a traveling rail 330. The crane part 322 has a crane bucket 21, a drive part 22, a support part 23, a hoisting wire 24, and a crane drive part 321 that moves up, down, left, and right.

[0060] The crane driving unit 321 is composed of a hoisting motor that hoists the crane bucket 21 and the like, and a traverse motor for the crane unit 322. The girder 323 can be moved 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 girder 323 has traverse rails 324, handrails 325, and a bottom net 326. The traverse rails 324 are rails along which the crane unit 322 travels, and are provided to extend in the left-to-right direction.

[0061] As shown in FIG. 10, the handrail 325 is provided to prevent the worker 30 from falling when walking on the girder 323. As shown in FIG. 11, the bottom net 326 is configured to have approximately the same length as the traverse rail 324. 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 multiple 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-to-rear direction shown in FIG. 11 and a second fixing jig 342 for cleaning the wall surface 13 in the left-to-right direction shown in FIG. 12.

[0062] The first fixing jig 341 shown in Fig. 11 has two first hooking portions 341A for hooking the gondola wire 53 with a shackle, which are provided at two locations 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 locations on the left and right ends, allowing for stable up and down movement. Furthermore, when cleaning the front-to-rear wall surfaces 13, the longitudinal direction of the gondola 5 and the front and rear wall surfaces 13 are parallel, allowing for efficient cleaning work.

[0063] The second fixing jig 342 shown in Fig. 12 has two second hooking portions 342A for hooking the gondola wire 53 with a shackle, which are provided at two locations spaced apart in the front-to-rear direction and protruding downward. As a result, the gondola 5 is supported by the first fixing jig 341 at least at two locations on the front-to-rear direction ends, allowing for stable up and down movement. Furthermore, when cleaning the wall surfaces 13 on the left and right sides, the longitudinal direction of the gondola 5 and the left and right wall surfaces 13 are parallel, allowing for efficient cleaning work.

[0064] Next, a method for cleaning the front, rear, left and right wall surfaces 13 according to the fourth embodiment will be described with reference to FIGS.

[0065] When cleaning the wall surface 13 in the front-to-rear direction indicated by diagonal lines in Figure 11, the overhead crane 2 is driven and stopped at a position several meters away from the front wall surface 13. As indicated by solid lines in the figure, first fixing jigs 341 are fixed to both left and right ends of the bottom net 326. At this time, the first hook portions 341A are fixed so that they are spaced apart left and right. With the gondola 5 placed on the bottom surface 12, the gondola wire 53 is fixed to the first hook portions 341A.

[0066] The workers 30 get into the gondolas 5 on both the left and right ends, move the gondolas 5 upward, and clean the front wall surface 13 from top to bottom with the high-pressure cleaners 40. After cleaning the wall surface 13 to its bottom, the workers 30 get out of the gondolas 5 while placing them on the bottom surface 12 and disconnect the gondola wires 53 from the deck 51. With the gondolas 5 no longer fastened to the first fixing jigs 341, the workers 30 move each first fixing jig 341 inward in the left-right direction as shown by the dotted lines. The workers 30 move the deck 51 to directly below the first hooking portion 341A and connect the gondola wires 53 to the deck 51. The workers 30 get into the gondolas 5 and clean the area next to the wall surface 13 that has just been cleaned, from top to bottom. By repeating this process, the front wall surface 13 is cleaned. 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.

[0067] Once the cleaning work on the front wall surface 13 is completed, the gondola 5 is placed on the bottom surface 12, the gondola wire 53 is separated from the deck 51, 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. After that, the same cleaning work as on the front wall surface 13 is carried out.

[0068] When cleaning the left-right wall surface 13 indicated by diagonal lines in Figure 12, the overhead 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 left and right ends of the bottom net 326. At this time, the second hook portions 342A are fixed so that they are spaced apart in the front-to-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.

[0069] Workers 30 get into the gondolas 5 on both the left and right ends, move the gondolas 5 upward, and clean the left and right wall surfaces 13 from top to bottom. When cleaning work is completed down to the bottom of the wall surface 13, the workers 30 get off the gondolas 5 with the gondolas 5 placed on the bottom surface 12 and separate the gondola wires 53 from the deck 51. With nothing fastened to the second fixing jig 342, the overhead crane 2 is moved backward on the traveling rails 330 by the amount of the fore-and-aft width of the garter 323. The gondola wires 54 are again attached to the deck 51, and the area next to the wall surface 13 that has just been cleaned is cleaned from top to bottom. In this way, the overhead crane 2 travels to the rear ends of the left and right wall surfaces 13 indicated by the dotted lines, and cleaning work on the left and right wall surfaces 13 is performed.

[0070] With this configuration, since the second fixing jigs 342 are provided on both left and right ends, it is possible to clean both left and right end walls at once by simply moving the overhead crane 2. This reduces the time required to clean the garbage bunker 1 and enables efficient cleaning work.

[0071] With this configuration, the gondola 5 is fixed to the garters 323 of the overhead crane 2, so the position at which the gondola 5 is suspended can be changed by the movement of the overhead crane 2. This allows for efficient cleaning work on the wall surface 13. In addition, the gondola 5 is fixed to the garters 323 at at least two points, so that the gondola 5 can be prevented from falling.

[0072] With this configuration, the gondola 5 is fixed to the fixing jig 340 provided on the girder 323 for cleaning work, and the position at which the gondola 5 is suspended can be changed by moving the fixing jig 340. This allows for efficient cleaning of the wall surface 13. Furthermore, since the wall surface 13 that is parallel to the left and right directions can be cleaned by the simple method of moving the fixing jig 340, cleaning of the garbage bin 1 can be achieved more efficiently than when scaffolding 201 is set up as shown in FIG. 14.

[0073] With this configuration, cleaning work is performed with the gondola 5 fixed to the fixing jig 340 provided on the girder 323, so the position at which the gondola 5 is suspended can be changed by moving the overhead crane 2. This allows for efficient cleaning of the wall surface 13. Furthermore, since the wall surface 13 perpendicular to the left-right direction can be cleaned using the simple method of moving the overhead crane 2, cleaning of the garbage bin 1 can be performed more efficiently than when scaffolding 201 is set up as shown in FIG. 14.

[0074] The method for cleaning a garbage 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.

[0075] In the method for cleaning a garbage bunker 1 according to the first embodiment, the overhead crane 2 is moved with the gondola wire 53 and the deck 51 separated, but this is not limiting. For example, the deck 51 of the gondola 5 is placed on the bottom surface 12, and the overhead crane 2 is moved with the gondola wire 53 sufficiently slackened. At this time, the gondola 5 is not moved by the overhead crane 2 because the gondola wire 53 is slack. After that, the hydraulic excavator 4 can be moved below the overhead crane 2 by reeling in the gondola wire 53. This eliminates the need for the worker 30 to move the deck 51 to below the overhead crane 2.

[0076] In the above-described 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-lifting gondola suspended from the hydraulic excavator 4 may also be used.

[0077] In the fourth embodiment, the gondola wire 53 and the fixing jig 340 are separated when the fixing jig 340 is moved, but this is not limiting. For example, the worker 30 may move the fixing jig 340 while the gondola 5 is placed on the bottom surface 12, with the gondola wire 53 sufficiently slackened, and then the worker 30 may move the gondola 5 directly below the fixing jig 340 and reel in the gondola wire 53, thereby moving the gondola 5 in the left-right direction. This eliminates the need for the worker 30 to move the gondola 5 and to separate the fixing jig 340 and the gondola wire 53, thereby improving work efficiency.

[0078] In the fourth embodiment, the gondola wires 53 are fixed to the garters 323 by the fixing jig 340, but this is not limiting. 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]

[0079] 1. Garbage bunker 2 overhead crane 3 bottom stone 4. Hydraulic excavators 5. Gondola 10. Garbage 11 Drain 12 Bottom 13 Wall 20 Storage section 21 Crane Bucket 22 Drive unit 30 workers 41 Bucket 45 Breaker 46 Mesh Bucket 51 Decks 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 garbage accumulated on the walls and bottom of a garbage bunker equipped with an overhead crane, comprising: a step of fixing a self-propelled construction machine to the overhead crane; a step of moving the overhead crane to carry the construction machine into the garbage bin; a step of exposing a bottom surface by moving the waste with the construction machine and placing the construction machine on the exposed bottom surface; a step of forming a passageway with an exposed bottom surface on which the construction machine can travel by moving the waste with the construction machine; removing the waste from the waste bunker; fixing the construction machine to the overhead crane; a step of removing the construction machine from the garbage bunker by moving the overhead crane.

2. A method for cleaning garbage stuck to the wall and bottom surfaces of a garbage bin having an opening communicating with the outside, comprising: Securing a self-propelled construction machine to a hook of a crane vehicle; a step of moving the construction machine into the garbage bin by extending the boom of the crane vehicle from the access door into the garbage bin; placing the construction machine in the garbage bunker by lowering the hook; a step of exposing a bottom surface by moving the waste with the construction machine and placing the construction machine on the exposed bottom surface; a step of forming a passageway with an exposed bottom surface on which the construction machine can travel by moving the waste with the construction machine; removing the waste from the waste bunker; securing the construction machine to the hook; and removing the construction machine from the garbage bunker by raising the hook, shortening the boom, and moving it through the access opening.

3. 3. A method for cleaning a garbage bunker according to claim 1, wherein the passage is formed along the wall surface of the garbage bunker.

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