Dismantling method

Abstract

To provide a demolition method capable of reducing noise effectively and performing a demolition work.SOLUTION: An attachment 20 is fixed to a tip of an arm 15 of a giant breaker. A piston 23 repeating an operation of pushing a chisel 25 to a tip is built in the attachment 20. A sponge 31 contacts closely with the outside of a cover part 22 of the attachment 20 and a soundproof sheet 32 is wrapped around and fixed to the sponge 31. The sponge 31 and the soundproof sheet 32 cover the surrounding of a contact part of the piston 23 and the chisel 25. Then, water is sprayed to the attachment 20 and the water is absorbed to the sponge 31 by this spray. Then, the giant breaker brings the chisel 25 of the attachment 20 to the reciprocal oscillation in an axial direction and demolishes an object.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a demolition method for demolishing a building or the like. [Background technology]

[0002] When demolishing buildings made of reinforced concrete or the like, demolition machines such as giant breakers with chisel-equipped attachments attached to the ends of their arms are sometimes used (see, for example, Non-Patent Document 1). As shown in Non-Patent Document 1, the attachment has a piston for reciprocating the chisel, which is arranged alongside the chisel on the same axis. Furthermore, when demolition work is carried out using this demolition machine, a large amount of noise is generated during the work. Therefore, breakers with reduced noise have been studied (see, for example, Patent Document 1).

[0003] The giant breaker described in Patent Document 1 has an attachment with a chisel attached to the tip of an arm. This attachment has a foam dispensing unit that dispenses foam so that it covers the chisel. The foam from the foam dispensing unit is then filled into a bag that covers the chisel's periphery, and the attachment is operated to perform demolition work with the chisel covered with foam. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-105044 [Non-patent literature]

[0005] [Non-Patent Document 1] FRD Koga Rock Drill, New Hydraulic Breaker Fxα Series, [online], [Searched May 27, 2021], Internet<http: / / www.furukawarockdrill.co.jp / products / breaker / spec / lineup-index.htm> Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the technique described in Patent Document 1, the fleas are covered with a foam material during the dismantling work, and therefore a device for generating the foam material is required. [Means for solving the problem]

[0007] The dismantling method that solves the above problem is a method in which the chisel of an attachment fixed to the tip of the breaker arm is moved back and forth in the axial direction to dismantle the object, and a sponge is tightly attached to the outside of the cover part of the attachment, and a soundproofing sheet is wrapped around and fixed around the sponge. [Effects of the Invention]

[0008] According to the present invention, dismantling work can be carried out with efficient noise reduction. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an overall perspective view illustrating a dismantling machine according to an embodiment; [Figure 2] FIG. 2 is an enlarged view of a main part of an attachment of the demolition machine according to the embodiment. [Figure 3] FIG. 2 is a front view of an attachment for a demolition machine according to an embodiment. [Figure 4] FIG. 2 is a partial cross-sectional front view of an attachment for a demolition machine according to an embodiment. [Figure 5] FIG. 2 is a front view illustrating a dismantling operation using a dismantling machine according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, one embodiment of the disassembly method of the present invention will be described with reference to FIGS. As shown in Fig. 1, a giant breaker (impact-type crushing device) 10 serving as a demolition machine in this embodiment includes a base machine 11 and an attachment 20. Specifically, the base machine 11 includes a lower traveling body including crawlers 12, and an upper rotating body including an operation room 13 and a boom 14. The attachment 20 is attached to the boom 14 via an arm 15. A noise reduction member 30 is attached to the attachment 20.

[0011] (Noise reduction member 30) 2 to 4 are an enlarged perspective view, a front view, and a partially cutaway cross-sectional view of the attachment 20 of FIG. 1, respectively. As shown in Figures 3 and 4, the attachment 20 is a top-mount type and includes an attachment body 21 having a generally rectangular parallelepiped shape and a cover 22 that covers the outer periphery of the attachment body 21. The attachment body 21 includes a chisel 25, a drive mechanism that hydraulically reciprocates the chisel 25, and a case that holds these. The lower portion of the chisel 25 protrudes from the end of the case, and the tip (lower end) of the chisel 25 has a tapered needle shape. The upper end 25a (base end) of the chisel 25 is held so as to be able to abut against a reciprocating piston 23 of the drive mechanism. The piston 23 and the upper end 25a of the chisel 25 are held so as to be able to reciprocate in a cylinder of the drive mechanism. Furthermore, a pressure chamber 24 is provided at the upper end of the attachment body 21. The upper end of the piston 23 is housed in the pressure chamber 24, and oil that presses the piston 23 downward is contained in the pressure chamber 24. The change in hydraulic pressure in the pressure chamber 24 causes the chisel 25 to reciprocate in the vertical direction (axial direction) via the piston 23.

[0012] Additionally, the cover portion 22 of the attachment 20 covers the four side surfaces of the attachment body 21. Furthermore, the cover portion 22 is provided with an attachment portion 18 at a position above the chisel 25 for attachment to the arm 15.

[0013] 2, a noise reduction member 30 is wrapped around the outer periphery of the cover portion 22 of the attachment 20. This noise reduction member 30 is usually arranged so as to cover the periphery (side) of the contact portion between the piston 23 and the chisel 25 when the piston 23 presses against the chisel 25. 4, the noise reduction member 30 is positioned such that the contact portion between the piston 23 and the chisel 25 in a natural state is positioned at the center in the vertical direction, and is large enough to cover the upper end of the exposed portion of the chisel 25 that is exposed from the attachment body 21. In this case, the noise reduction member 30 covers at least the uppermost position to which the chisel 25 can move.

[0014] As shown in FIG. 3, the noise reduction member 30 includes a water-absorbent porous sponge 31, a soundproof sheet 32, and a cord-like member 33 around which these are wound and fixed. The sponge 31 is fixed in close contact with the outer peripheral surface of the cover portion 22. In this embodiment, the sponge 31 is made of multiple thick, rectangular sheets of soft urethane foam. Specifically, the sponge 31, which is made up of multiple overlapping sheets of soft urethane foam, is wrapped around the four side surfaces of the cover portion 22. Then, a cord-like body 33 is wrapped around the outer peripheral surface of the sponge 31 and fixed thereto, thereby positioning the sponge 31 in close contact with the outer peripheral surface of the cover portion 22. In this case, the sponge 31 is wound at a height that exposes the lower end of the cover portion 22, with the contact point between the piston 23 and the chisel 25 being the center height. Furthermore, the multiple sponges 31 arranged on the outer peripheral surface of the cover portion 22 are wound so that no gaps are formed between them.

[0015] The soundproof sheet 32 is wrapped around the outer periphery of the sponge 31 with a cord-like member 33. This soundproof sheet 32 is a commercially available sheet that is known to have a certain level of soundproofing effect. In this embodiment, a soundproof sheet manufactured by Higashiyama Sangyo Co., Ltd. is folded to a predetermined width and wrapped around the sponge 31 so as to cover the sponge 31. Specifically, the soundproof sheet 32 is positioned so that it covers the upper end 25a of the chisel 25 at its center height, extending slightly above the upper end of the sponge 31, and is also positioned slightly below the lower end of the sponge 31 to cover the upper end of the exposed portion of the chisel 25 that is exposed from the attachment body 21. Here, the upper end of the soundproof sheet 32 is left exposed and does not cover the entire upper surface 31a of the sponge 31, allowing water to flow into the sponge 31 from the outside.

[0016] The cord-like bodies 33 that respectively fix the sponge 31 and the soundproof sheet 32 are made of, for example, wire. Furthermore, the cord-like body 33 that wraps around and fixes the soundproof sheet 32 is arranged at a position that does not overlap the position of the cord-like body 33 that wraps around and fixes the sponge 31.

[0017] (Demolition work) Next, the dismantling work using the giant breaker 10 will be described with reference to FIG. Before dismantling work is performed, water is sprayed onto the attachment 20 around which the noise reduction member 30 is wound using a hose 40. As a result, the sprayed water W1 flows down the cover portion 22 and reaches the sponge 31 from the upper surface portion 31a, and the sponge 31 absorbs the water.

[0018] After the sponge 31 has been sufficiently absorbed, the demolition work is carried out. For example, if the object to be demolition 50 is reinforced concrete, the tip of the chisel 25 of the giant breaker 10 is placed on the top surface of the object to be demolition 50. Then, water is sprayed using the hose 40, including the area around the demolition site. In this state, the arm 15 and attachment 20 of the giant breaker 10, and the chisel 25, are moved up and down to crush the surface of the object to be demolition 50.

[0019] (action) After a sponge 31 is attached to the outer periphery of the cover part 22 of the attachment 20, the outer periphery of this sponge 31 is covered with a soundproof sheet 32. As a result, sound is absorbed by the sponge 31 attached to the cover part 22, and the soundproof sheet 32 traps noise.

[0020] According to this embodiment, the following effects can be obtained. (1) In this embodiment, the sponge 31 is tightly attached to the cover portion 22 of the attachment 20 and secured by the cord-like body 33, and the soundproof sheet 32 is wrapped around the sponge 31 and secured by the cord-like body 33. This allows the noise reduction member 30 to be easily attached to the attachment 20, thereby reducing noise.

[0021] The noise from the giant breaker 10 was measured when the noise reduction member 30 was installed and when it was not installed. In this case, a noise and vibration meter was installed at a position approximately 40 m from the giant breaker 10. When the noise reduction member 30 was not attached to the attachment 20, the maximum noise value was 83 dB and the average value was approximately 80 dB. In contrast, when the noise reduction member 30 was installed as described above and the above-mentioned dismantling work was carried out, the maximum noise value was 73 dB and the average value was approximately 70 dB.

[0022] (2) In this embodiment, the noise reduction member 30 covers the periphery of the contact area between the piston 23 and the chisel 25 when the piston 23 presses against the chisel 25. This makes it possible to efficiently reduce noise.

[0023] (3) In this embodiment, the demolition work is performed using the giant breaker 10 with the sponge 31 soaked in water W1. Therefore, the water W1 soaked in the sponge 31 can reduce noise.

[0024] (4) In this embodiment, water is sprayed toward the attachment 20, causing the sponge 31 to absorb the water. This allows the sponge 31 to efficiently absorb the water while using the water spray to prevent dust from scattering.

[0025] (5) The attachment 20 of this embodiment is a top-mount type in which the mounting portion 18 for mounting to the arm 15 is provided above the chisel 25. As a result, the cover portion 22 of the attachment 20 has a substantially rectangular parallelepiped shape, so the noise reduction member 30 can be wrapped around a wide area of the cover portion 22. Therefore, the noise generated by the attachment 20 can be reduced over a wide area.

[0026] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility. In the above embodiment, the noise reduction member 30 is provided on the top-mounted attachment 20. The attachment 20 is not limited to the top-mounted type, and may be, for example, a side-mounted type. The cover of this side-mounted attachment has an attachment portion that is attached to the arm and is fixed to the side of the pressure chamber. In this attachment as well, the noise reduction member is fixed so as to cover the side of the contact portion between the piston 23 and the chisel 25. The noise reduction member is provided in a portion whose thickness allows the sponge that constitutes it to completely cover the outer periphery of the cover.

[0027] In the above embodiment, the sponge 31, soundproofing sheet 32, and cord-like body 33 of the noise reduction member 30 are made of the materials described above. However, they are not limited to being made of the materials described above. For example, the sponge 31 may be made of a material other than soft urethane foam, as long as it is a porous material with water absorption. The soundproofing sheet 32 may be any sheet-like material that can reduce sound. Furthermore, the cord-like body may be a rope or the like, as long as it can secure the sponge to the cover in close contact with the cover, or can secure the soundproofing sheet to the outer periphery of the sponge.

[0028] In the above embodiment, the noise reduction member 30 is disposed on the cover portion 22 of the attachment 20 so as to cover the periphery (side) of the contact portion between the piston 23 and the chisel 25 when the piston 23 normally presses against the chisel 25. The location of the noise reduction member 30 is not limited to this. For example, the noise reduction member 30 may be disposed so as to cover the tip of the cover portion 22 or the top of the chisel 25 inside the attachment body 21. In this case, although it is effective to cover the periphery of the contact portion between the piston 23 and the chisel 25 to reduce noise, noise can also be reduced by covering other portions.

[0029] In the above embodiment, the sponge 31 of the noise reduction member 30 was soaked in water by spraying it with water before the dismantling work. The timing for soaking the sponge 31 is not limited to before the dismantling work, but may be during the dismantling work. Furthermore, the sponge 31 does not have to be soaked in water by spraying it with water. For example, a hose may be connected to the top of the soundproof sheet 32 so that the sponge 31 is soaked in water constantly or periodically. In the above embodiment, reinforced concrete is used as the object to be demolition 50. The object to be demolition 50 is not limited to reinforced concrete.

[0030] Next, the technical ideas that can be understood from the above-described embodiment and other examples will be described below. (a) A dismantling method as described in any one of claims 1 to 3, characterized in that the soundproofing sheet is wrapped around and fixed to the cover portion with a gap between the soundproofing sheet and the cover portion, and water sprayed on the cover portion is absorbed by the sponge, thereby dismantling the object.

[0031] (b) A dismantling method according to any one of claims 1 to 3 or (a), characterized in that the attachment is a top-mount type in which a mounting portion that is attached to the arm is disposed above the chisel. [Explanation of symbols]

[0032] 10...Giant breaker, 11...Base machine, 12...Crawler, 13...Operation room, 14...Boom, 15...Arm, 18...Mounting part, 20...Attachment, 21...Attachment body, 22...Cover part, 23...Piston, 24...Pressure chamber, 25...Chisel, 25a...Upper end, 30...Noise reduction member, 31...Sponge, 31a...Upper surface part, 32...Soundproofing sheet, 33...Rigid body, 40...Hose, 50...Object to be dismantled.

Claims

1. A dismantling method for dismantling an object by reciprocating a chisel attached to the tip of a breaker arm in an axial direction, The attachment has a built-in piston that pushes out the chisel, A demolition method characterized by placing a sponge in close contact with the entire outer surface of the cover part of the attachment, including around the contact point between the chisel and the piston, wrapping and fixing a soundproofing sheet around the sponge, and dismantling the object.

2. A demolition method as described in claim 1, characterized in that the sponge and the soundproofing sheet are positioned so that the tip of the chisel is exposed from the lower end of the sponge and the lower end of the soundproofing sheet.

3. The soundproofing sheet is fixed to the sponge so that the upper surface of the sponge is exposed so that water can flow into the sponge from the outside, 3. The dismantling method according to claim 1, wherein water is sprayed onto the attachment from above to cause the sponge to absorb the water, and the object is dismantled.

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