Demolition machine and demolition method

Abstract

To provide a demolition machine and a demolition method that can perform demolition work while efficiently reducing noise.SOLUTION: A demolition machine 10 is equipped with a breaker attachment 20. The breaker attachment 20 has a cover portion 22, a chisel 26 disposed inside the cover portion 22, a drive mechanism 25 that vibrates the chisel 26 in the axial direction, and a foam supply portion 27 that discharges foam 29 to cover the periphery of the chisel 26. In the demolition machine 10, the outer periphery of the breaker attachment 20 is covered with a noise-reducing member 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a dismantling machine and a dismantling method. [Background technology]

[0002] When demolishing buildings made of reinforced concrete, etc., demolition machines such as giant breakers with chisels attached to the end of their arms are mainly used. When demolition work is performed using these demolition machines, the chisels strike and crush the concrete and rebar, generating loud noises during the work. Therefore, breakers that can reduce noise during demolition work have been studied. For example, Patent Document 1 discloses a dismantling method in which a foam distributor is attached to the tip of the arm of a giant breaker and the flea is surrounded by foam discharged from the foam distributor to reduce noise. Furthermore, Patent Document 2 discloses a dismantling method for reducing noise by adhering a sponge to the cover of the attachment fixed to the tip of the breaker arm and then wrapping a soundproof sheet around it. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-105044 A [Patent Document 2] JP 2022-182747 A Summary of the Invention [Problem to be solved by the invention]

[0004] In large demolition sites, where a large number of demolition machines are used, there is a need to reduce noise more efficiently. The present invention has been made in consideration of the above circumstances, and has an object to provide a dismantling machine and a dismantling method that can perform dismantling work while efficiently reducing noise. [Means for solving the problem]

[0005] The present invention is a demolition machine equipped with a breaker attachment, the breaker attachment having a cover portion, a chisel arranged inside the cover portion, a drive mechanism for vibrating the chisel in the axial direction, and a foam supply portion for ejecting foam to cover the periphery of the chisel, and the outer periphery of the breaker attachment is covered with a noise reduction material.

[0006] The noise reduction member is preferably at least one selected from glass wool, glass cloth, ceramic fiber, rock wool, soft resin, and soft resin porous body.

[0007] It is preferable that the outer periphery of the noise reduction member is covered with a soundproof sheet.

[0008] The thickness of the noise reduction member when covering the outer periphery of the breaker attachment is preferably 30 mm or more and 100 mm or less.

[0009] The demolition machinery is preferably of the ultra-low noise type.

[0010] Another present invention is a demolition method for dismantling an object to be demolitioned using a demolition machine equipped with a breaker attachment equipped with a chisel, in which the demolition work is performed with the outer periphery of the breaker attachment covered with a noise reduction material and the outer periphery of the chisel covered with a foam material.

[0011] In the dismantling method of the present invention, the noise reduction member is preferably at least one selected from glass wool, glass cloth, ceramic fiber, rock wool, soft resin, and soft resin porous body. Effect of the Invention

[0012] According to the present invention, it is possible to provide a demolition machine and a demolition method capable of performing demolition work while efficiently reducing noise. [Brief description of the drawings]

[0013] [Figure 1] 1 is a schematic perspective view of a giant breaker according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a schematic diagram showing a foam supply section of a giant breaker according to one embodiment of the present invention. [Diagram 3] 1 is a schematic diagram showing a noise reduction member of a giant breaker according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0015] [Demolition machine] A giant breaker, which is one embodiment of a demolition machine of the present invention, will be described. Fig. 1 shows a schematic perspective view of the giant breaker. Fig. 2 and Fig. 3 show enlarged perspective views of a breaker attachment 20. For ease of explanation, Fig. 2 shows a view excluding a noise reduction member. As shown in Fig. 1, the giant breaker 10 includes a base machine 11 and a breaker attachment 20. Specifically, the base machine 11 includes a lower traveling body A including a crawler 12, and an upper rotating body B including an operation room 13, a boom 14, and an arm 15. The breaker attachment 20 is attached to the tip of the arm 15. The giant breaker 10 of this embodiment performs demolition work by impacting and crushing objects to be demolished, such as reinforced concrete, using a chisel 26 provided on the breaker attachment 20. Each component will be described below.

[0016] (Breaker attachment) As shown in Figure 2, the breaker attachment 20 is a top-mount type and has an approximately rectangular parallelepiped attachment body 21, a cover part 22, a chisel 26 arranged inside the cover part 22, a drive mechanism 25 that hydraulically vibrates the chisel 26 in the axial direction, and a foam supply part 27 that ejects foam to cover the periphery of the chisel 26. The cover portion 22 of the breaker attachment 20 covers four side surfaces of the attachment body 21. The cover portion 22 is attached to the arm 15 by the attachment portion 18. The chisel 26 has a needle shape with a tapered tip, and is arranged so as to protrude from the lower end portion 22 a of the cover portion 22 . The drive mechanism 25 includes a piston 23 and a pressure chamber 24 in which an upper end of the piston 23 is accommodated. An upper end 26a of a chisel 26 is held in contact with the piston 23. The pressure chamber 24 accommodates oil that presses the piston 23 downward, and by changing the oil pressure in the pressure chamber 24, the chisel 26 is vibrated in the axial direction via the piston 23.

[0017] (Foam supply section) In this embodiment, the foam supply unit 27 is composed of a cylindrical member (hereinafter, referred to as the cylindrical member 27). As shown in Fig. 2, the cylindrical member 27 is attached to the lower end of the attachment body 21. Since the inner diameter of the cylindrical member 27 is designed to be larger than the diameter of the chisel 26, a space is formed between the inner wall of the cylindrical member 27 and the chisel 26 for delivering the foam. Further, the cylindrical member 27 has a plurality of openings provided at equal intervals on its inner wall, and the plurality of openings are connected to a hose 28 passing through the inside of the cylindrical member 27. The hose 28 is connected to a tank (not shown) that stores a foam-generating solution along the arm 15 and the boom 14. The foam-generating solution is pumped out of the tank by a compressor, turned into foam 29 by a bubble generator (not shown), and sent to the cylindrical member 27 through the hose 28. The foam 29 is discharged from the plurality of openings of the cylindrical member 27, and gradually flows down along the outer periphery of the chisel 26 to the tip, covering the chisel 26 and the object to be dismantled.

[0018] The chisel 26 impacts and crushes the object to be demolition by vibrating it in the axial direction by the driving mechanism 25. When a concrete structure or the like is impact-crushed by the chisel 26, noise that is unpleasant to humans, specifically, noise in the frequency band of 1 kHz or more, is generated, but the foam body 29 can effectively reduce such noise.

[0019] -Foam-like body- In this embodiment, a foam generating solution is used that is mainly based on an anionic surfactant and can generate bubbles by foaming. Examples of the anionic surfactant that can be used here include sulfonates such as α-olefin sulfonates, α-sulfonic fatty acid methyl ester salts, and alkanesulfonates; sulfates such as alkyl sulfates and alkyl ether sulfates; fatty acid salts; and carboxylates such as alkyl ether carboxylates. The foam 29 preferably contains the foaming agent at a ratio of 0.01% by mass to 50% by mass. Among these, a concentration of the foaming agent at a ratio of 0.2% by mass to 10% by mass is particularly preferred.

[0020] (Noise reduction materials) 3, a noise reduction member 30 is wrapped around the outer periphery of the breaker attachment 20. The noise reduction member 30 is preferably arranged so as to cover the periphery (side) of the contact portion where the piston 23 and the upper end 26a of the chisel 26 come into contact when the piston 23 presses the chisel 26. Specifically, the noise reduction member 30 is arranged with a size that covers up to the upper end of the exposed portion of the chisel 26 exposed from the attachment body 21, with the contact portion where the piston 23 and the upper end 26a of the chisel 26 come into contact in a natural state being at the center in the up-down direction. In this case, the noise reduction member 30 preferably covers at least up to the uppermost position to which the chisel 26 can move.

[0021] The noise reduction member 30 is preferably made of at least one material selected from glass wool, glass cloth, ceramic fiber, rock wool, soft resin, and soft resin porous body. The noise reduction member 30 may be made of a commercially available heat insulating material. Examples of the soft resin include silicone rubber, polyurethane, polyolefin, polyethylene, polypropylene, polyvinyl chloride, polystyrene, melamine resin, phenol resin, and epoxy resin. Examples of the soft resin porous body include foams of the above resins. Of these, glass cloth, glass wool, and polyurethane foam are preferable for the noise reduction member 30.

[0022] The thickness of the noise reduction member 30 alone is preferably 30 mm to 100 mm, more preferably 30 mm to 70 mm, more preferably 30 mm to 60 mm, and particularly preferably 40 mm to 50 mm. When the noise reduction member 30 has a thickness of 30 mm or more, noise in a frequency band of 1 kHz or more can be effectively reduced, and when the thickness is 100 mm or less, it is easy to wrap the noise reduction member 30 around the outer shape of the breaker attachment 20. The noise reduction member 30 is preferably fixed in close contact with the outer circumferential surface of the cover part 22 of the breaker attachment 20, and is therefore wound in one or more layers so as to cover the four side surfaces of the cover part 22. Then, the cord-like body 32 is wrapped around the outer circumferential surface of the noise reduction member 30 and fixed thereto, thereby bringing the noise reduction member 30 into close contact with the outer circumferential surface of the cover part 22.

[0023] -Thickness- The thickness of the noise reduction member 30 when covering the outer periphery of the cover portion 22 of the breaker attachment 20 is preferably 30 mm or more and 100 mm or less. By making the thickness of the noise reduction member 30 when covering the outer periphery of the cover portion 22 30 mm or more, it is possible to more effectively reduce sounds in the frequency band of 1 kHz or more that are unpleasant to people. Furthermore, even if the thickness of the noise reduction member 30 when covering the outer periphery of the cover portion 22 exceeds 100 mm, the noise reduction effect does not increase.

[0024] -Soundproofing sheet- As shown in FIG. 3, a soundproof sheet 31 may be further wrapped around the noise reducing member 30. The soundproof sheet 31 may be a commercially available sheet that has a certain level of soundproofing effect. In this embodiment, a soundproof sheet manufactured by Higashiyama Sangyo Co., Ltd. is wrapped around the noise reducing member 30 in a desired width. Specifically, the soundproof sheet 31 is preferably wrapped around the upper end of the noise reducing member 30 and the lower end of the noise reducing member 30 with the upper end 26a of the chisel 26 as the center height. The soundproof sheet 31 is fixed with a cord-like body 32. An example of a commercially available soundproof sheet 31 is a soundproof sheet manufactured by Higashiyama Sangyo Co., Ltd.

[0025] -Family body- Examples of the cord-like body 32 for fixing the noise reduction member 30 and the soundproof sheet 31 include wire, adhesive tape, etc. From the viewpoint of firmly fixing them, it is preferable that the position of the cord-like body 32 for fixing the noise reduction member 30 and the position of the cord-like body 32 for fixing the soundproof sheet 31 are different.

[0026] The demolition machine of the present invention, equipped with both a foam supply unit and a noise reduction member, can reduce the noise level significantly more than if each unit was equipped alone. Although the mechanism behind this is unclear, it is assumed that a synergistic effect is achieved by taking noise reduction measures for the chisel, which is the source of the loudest noise, and the tip of the breaker attachment, which is the second loudest source of noise. Therefore, demolition work can be carried out efficiently at large-scale construction sites.

[0027] [Disassembly method] The dismantling method of the present invention is a method for dismantling an object to be dismantled using a demolition machine equipped with a breaker attachment having a chisel, in which the outer periphery of the breaker attachment is covered with a noise reduction member and the outer periphery of the chisel is covered with a foam body while the dismantling work is carried out. The noise reduction member is the same as that described above. The dismantling method of the present invention covers the outer periphery of the breaker attachment with a noise reduction material and covers the outer periphery of the chisel with a foam, thereby reducing noise more effectively than when dismantling work is performed using only the noise reduction material or only the foam. EXAMPLES

[0028] The present invention will be described in detail below with reference to examples. However, the present invention is not limited to the examples shown below.

[0029] [Example 1-1] The demolition machine was prepared by mounting the breaker attachment described below to the base machine described below. A cylindrical member for supplying foam and a hose for sending foam to the cylindrical member were attached to the lower end of the attachment body of the breaker attachment. In addition, the following sheet was wrapped once around the breaker attachment and secured in place with wire and adhesive vinyl tape. The discharge rate of the foam was 0.6 L / min.

[0030] (1) Base machine: Small hydraulic excavator (product name "ZX30U", machine weight 3t, manufactured by Hitachi Construction Machinery Co., Ltd.) (2) Breaker attachment: Breaker (product name "FX35SS", ultra-low noise specification, manufactured by Furukawa Rock Drill Co., Ltd.) (3) Noise reduction materials: Glass cloth / aluminum foil sheet (product name: Magroll (registered trademark) AG2450, manufactured by Mag-Isober Co., Ltd.) (4) Object to be demolished: Concrete material measuring 1000mm x 1500mm x 300mm.

[0031] (measurement) The sound generated by striking the concrete with the demolition machine was measured at a point 5 m from the excitation point using a sound level meter (product name "NL-42", manufactured by Rion Co., Ltd.). The measurement was continued for 10 seconds from the start of the strike, and the maximum value was recorded as the measured value. The measurement results are shown in Table 1.

[0032] [Example 1-2] The procedure was the same as in Example 1-1, except that the noise reduction member was wrapped twice.

[0033] [Examples 1-3] The procedure was the same as in Example 1-2, except that a soundproof sheet (polyester thread, vinyl chloride coating) (product name "Soundproof Sheet", thickness 0.5 mm, manufactured by Monotaro Corporation) was further wrapped around the substrate.

[0034] [Examples 1-4] The same procedure as in Example 1-1 was used, except that a foamed urethane sheet (urethane sound-absorbing material, product name "Calmflex F2", thickness 30 mm, manufactured by Inoac Corporation) was wrapped twice around the outer periphery of the cover part of the breaker attachment as a noise reduction member.

[0035] [Examples 1-5] The procedure was the same as in Example 1-4, except that a soundproof sheet (polyester thread, vinyl chloride coating) (product name "Soundproof Sheet", thickness 0.5 mm, manufactured by Monotaro Corporation) was further wrapped around the substrate.

[0036] [Comparative Example 1-1] The same dismantling machine as in Example 1-1 was used, but no foam was provided and no noise reducing member was used.

[0037] [Comparative Example 1-2] The same procedure was followed as in Example 1-1, except that no noise reducing member was used.

[0038] [Comparative Examples 1-3 to 1-5] The procedure was the same as in Examples 1-1 to 1-3, except that no foam was supplied.

[0039] [Comparative Example 1-6] The same procedure as in Comparative Example 1-3 was followed, except that a foamed urethane sheet (urethane sound absorbing material, product name "Calmflex F2", thickness 30 mm, manufactured by Inoac Corporation) was wrapped once around the outer periphery of the breaker attachment as a noise reduction member.

[0040] [Table 1]

[0041] [Example 2-1] Next, the demolition machine was prepared by attaching the breaker attachment described below to the large base machine described below. A cylindrical member for supplying foam and a hose for sending foam to the cylindrical member were attached to the lower end of the attachment body of the breaker attachment. The cover of the breaker attachment was wrapped in one layer of the same sheet as in Example 1-1 and secured with wire. The discharge rate of the foam was 1.5 L / min. The measurement method was the same as in Example 1-1 above. The measurement results are shown in Table 2. (1) Base machine: Large hydraulic excavator (product name "ZAXIS210LCK", machine weight 18t, manufactured by Hitachi Construction Machinery Co., Ltd.) (2) Breaker attachment: Breaker (product name "FRD275Fxj", ultra-low noise specification, manufactured by Furukawa Rock Drill Co., Ltd.)

[0042] [Comparative Example 2-1] The same dismantling machine as in Example 2-1 was used, but no foam was provided and no noise reduction member was used.

[0043] [Comparative Example 2-2] The same procedure as in Example 2-1 was followed except that no noise reducing member was used.

[0044] [Comparative Example 2-3] Same as Example 2-1 except no foam was provided.

[0045] [Comparative Example 2-4] The same procedure was followed as in Comparative Example 2-3, except that a soundproof sheet (polyester yarn, vinyl chloride coating) (product name "Soundproof Sheet", thickness 0.5 mm, manufactured by Monotaro Corporation) was further wrapped around the noise reduction member.

[0046] [Table 2]

[0047] [Example 3-1] The same demolition machine as in Example 2-1 was used, and the same procedure was followed as in Example 2-1, except that a foamed urethane sheet (urethane sound absorbing material, product name "Calmflex F2", thickness 30 mm, manufactured by Inoac Corporation) was wrapped once around the outer periphery of the cover of the breaker attachment as a noise reduction member. The measurement results are shown in Table 3.

[0048] [Example 3-2] The same procedure as in Example 3-1 was carried out except that the urethane foam sheet was sprayed with water and allowed to absorb the water.

[0049] [Comparative Example 3-1] The same dismantling machine as in Example 2-1 was used, but no foam was provided and no noise reduction member was used.

[0050] [Comparative Example 3-2] The same procedure was followed as in Example 3-1, except that no noise reducing member was used.

[0051] [Comparative Example 3-3] Same as Example 3-1 except no foam was provided.

[0052] [Comparative Example 3-4] The same procedure was followed as in Comparative Example 3-3, except that a soundproof sheet (polyester yarn, vinyl chloride coating) ("Soundproof Sheet", thickness 0.5 mm, manufactured by Monotaro Corporation) was further wrapped around the noise reduction member.

[0053] [Comparative Example 3-5] The same procedure was followed as in Comparative Example 3-3, except that the urethane foam sheet was sprayed with water and allowed to absorb it.

[0054] [Comparative Example 3-6] The same procedure was followed as in Comparative Example 3-5, except that a soundproof sheet (polyester yarn, vinyl chloride coating) (product name "Soundproof Sheet", thickness 0.5 mm, manufactured by Monotaro Corporation) was further wrapped around the noise reduction member.

[0055] [Table 3]

[0056] As shown in Tables 1 to 3, the examples in which a foam was supplied and a noise reduction member was further wrapped around the breaker attachment had a significantly lower noise level than the cases in which only a foam was supplied or only a noise reduction member was supplied. It can also be seen that the effects of the present invention are significant in both large and small breakers. [Explanation of symbols]

[0057] 10 Giant Breaker 11 Base Machine 12 Crawler 13 Control room 14. Boom 15 Arm 18 Mounting part 20 Breaker attachment 21 Attachment body 22 Cover part 23 Piston 24 Pressure Chamber 25 Drive mechanism 26 Flea 26a (top of chisel) 27 Foam supply section (cylindrical member) 28 Hose 30 Noise reduction materials 31 Soundproofing Sheet 32 Funicular body

Claims

1. A demolition machine equipped with a breaker attachment, The breaker attachment includes a cover portion, a chisel disposed inside the cover portion, a drive mechanism for vibrating the chisel in an axial direction, and a foam supply portion for discharging foam so as to cover the periphery of the chisel; A demolition machine, wherein the outer periphery of the breaker attachment is covered with a noise reducing material.

2. 2. The demolition machine according to claim 1, wherein the noise reducing member is at least one selected from the group consisting of glass wool, glass cloth, ceramic fiber, rock wool, soft resin, and soft resin porous body.

3. 3. The demolition machine according to claim 1, wherein an outer periphery of the noise reduction member is covered with a soundproof sheet.

4. 2. A demolition machine according to claim 1, wherein the noise reduction member has a thickness of 30 mm or more and 100 mm or less when covering the outer periphery of the breaker attachment.

5. 2. The dismantling machine according to claim 1, wherein the dismantling machine is of an ultra-low noise type.

6. A dismantling method for dismantling an object to be dismantled using a demolition machine equipped with a breaker attachment having a chisel, comprising: A dismantling method in which dismantling work is performed with the outer periphery of the breaker attachment covered with a noise reducing material and the outer periphery of the chisel covered with a foam material.

7. 7. The dismantling method according to claim 6, wherein the noise reducing member is at least one selected from the group consisting of glass wool, glass cloth, ceramic fiber, rock wool, soft resin, and soft resin porous body.

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