JP7568465B2 - Vibration damping material - Google Patents
Vibration damping material Download PDFInfo
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- JP7568465B2 JP7568465B2 JP2020169546A JP2020169546A JP7568465B2 JP 7568465 B2 JP7568465 B2 JP 7568465B2 JP 2020169546 A JP2020169546 A JP 2020169546A JP 2020169546 A JP2020169546 A JP 2020169546A JP 7568465 B2 JP7568465 B2 JP 7568465B2
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/24—Safety or protective measures preventing damage to building parts or finishing work during construction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
- F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
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- Aviation & Aerospace Engineering (AREA)
- Civil Engineering (AREA)
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- Vibration Prevention Devices (AREA)
Description
本発明は、クローラクレーンや油圧ショベル等の重機が走行する際の振動を低減するための振動低減材および振動低減方法に関する。 The present invention relates to a vibration reduction material and a vibration reduction method for reducing vibrations generated when heavy machinery such as crawler cranes and hydraulic excavators travel.
下記特許文献１には、建設工事現場等において重機が走行する際の振動を低減するための振動低減材が開示されている。この振動低減材は、熱硬化性樹脂である連続気泡ポリウレタンフォームと、その連続気泡ポリウレタンフォームの上に載置される敷板とによって構成されている。そして、この振動低減材においては、敷板上を重機が走行した際の振動を連続気泡ポリウレタンフォームによって吸収するようになっている。 The following Patent Document 1 discloses a vibration reduction material for reducing vibrations when heavy machinery travels on construction sites and the like. This vibration reduction material is composed of open-cell polyurethane foam, which is a thermosetting resin, and a base plate placed on top of the open-cell polyurethane foam. In this vibration reduction material, the open-cell polyurethane foam absorbs vibrations when heavy machinery travels on the base plate.
しかしながら、上述の振動低減材においては、重機が走行する際の振動を効果的に低減するには、ポリウレタンフォームの厚さを比較的厚くする（５０～１５０ｍｍ程度）必要があることから、重機の重量によってポリウレタンフォームが変形してしまい、重機の走行が安定しにくいという問題がある。 However, in the above-mentioned vibration-reducing materials, the polyurethane foam needs to be relatively thick (approximately 50 to 150 mm) to effectively reduce vibrations caused when heavy machinery is traveling, which causes the polyurethane foam to deform due to the weight of the heavy machinery, resulting in a problem that the heavy machinery's travel becomes unstable.
上記事実に鑑みてなされた本発明の課題は、重機が走行する際の振動を効果的に低減することができ、かつ、重機が安定して走行することができる振動低減材および振動低減方法を提供することである。 In light of the above, the objective of the present invention is to provide a vibration reduction material and a vibration reduction method that can effectively reduce vibrations when heavy machinery is traveling and that allows the heavy machinery to travel stably.
本発明の第１の局面によれば、上記課題を解決する以下の振動低減材が提供される。すなわち、重機が走行する際の振動を低減するための振動低減材であって、上面を重機が走行する敷板と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートとを備え、前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、前記網状シートは、複数の上段筋と、前記複数の上段筋の下方に位置する複数の下段筋とを含み、前記上段筋および前記下段筋は互いに異なる位相で所定方向に延びる正弦波状に形成されており、前記上段筋のそれぞれは前記下段筋の３本以上に連結されている振動低減材が提供される。
本発明の第２の局面によれば、上記課題を解決する以下の振動低減材が提供される。すなわち、重機が走行する際の振動を低減するための振動低減材であって、上面を重機が走行する敷板と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートとを備え、前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、前記網状シートは、前記上側接触部から前記下側接触部に向かって傾斜する傾斜部を有する振動低減材が提供される。
According to a first aspect of the present invention, there is provided the following vibration-reducing material that solves the above-mentioned problems. That is, there is provided a vibration-reducing material for reducing vibrations when heavy machinery travels, comprising a floor plate on which the heavy machinery travels, and a synthetic resin mesh sheet disposed below the floor plate and having a plurality of through holes formed therein that penetrate in the vertical direction, the mesh sheet has a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is placed, the lower contact portions are not present directly below at least some of the plurality of upper contact portions when the mesh sheet is not deformed, the mesh sheet includes a plurality of upper-level reinforcements and a plurality of lower-level reinforcements that are located below the plurality of upper-level reinforcements, the upper-level reinforcements and the lower-level reinforcements are formed in a sine wave shape that extends in a predetermined direction with mutually different phases, and each of the upper-level reinforcements is connected to three or more of the lower-level reinforcements .
According to a second aspect of the present invention, there is provided the following vibration-reducing material that solves the above-mentioned problems: That is, there is provided a vibration-reducing material for reducing vibrations when heavy machinery runs, comprising a floor plate on which the heavy machinery runs, and a synthetic resin mesh sheet arranged below the floor plate and having a plurality of through holes formed therein that penetrate in the vertical direction, the mesh sheet has a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is placed, the lower contact portions are not present directly below at least some of the plurality of upper contact portions when the mesh sheet is not deformed, and the mesh sheet has an inclined portion that inclines from the upper contact portions toward the lower contact portions.
前記網状シートはエラストマー製であるのが好都合である。前記網状シートの下方に付加敷板が配置されるのが好ましい。 Advantageously, the reticulated sheet is made of an elastomer. Preferably, an additional lining is arranged below the reticulated sheet.
本発明の第３の局面によれば、上記課題を解決する以下の振動低減方法が提供される。すなわち、重機が走行する際の振動を低減するための振動低減方法であって、上面を重機が走行する敷板を設置する工程と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートを設置する工程とを含み、前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、前記網状シートは、複数の上段筋と、前記複数の上段筋の下方に位置する複数の下段筋とを含み、前記上段筋および前記下段筋は互いに異なる位相で所定方向に延びる正弦波状に形成されており、前記上段筋のそれぞれは前記下段筋の３本以上に連結されている振動低減方法が提供される。
また、本発明の第４の局面によれば、上記課題を解決する以下の振動低減方法が提供される。すなわち、重機が走行する際の振動を低減するための振動低減方法であって、上面を重機が走行する敷板を設置する工程と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートを設置する工程とを含み、前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、前記網状シートは、前記上側接触部から前記下側接触部に向かって傾斜する傾斜部を有する振動低減方法が提供される。
According to a third aspect of the present invention, there is provided a vibration reduction method for solving the above-mentioned problems, which includes the steps of: installing a floor plate on which the heavy equipment runs; and installing a synthetic resin mesh sheet disposed below the floor plate and having a plurality of through holes formed therein that penetrate in the vertical direction, the mesh sheet having a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is installed, the lower contact portions not being present directly below at least some of the upper contact portions when the mesh sheet is not deformed, the mesh sheet including a plurality of upper-level reinforcements and a plurality of lower-level reinforcements located below the upper-level reinforcements, the upper-level reinforcements and the lower-level reinforcements being formed in a sine wave shape extending in a predetermined direction with mutually different phases, and each of the upper-level reinforcements being connected to three or more of the lower-level reinforcements .
According to a fourth aspect of the present invention, there is provided the following vibration reduction method for solving the above problem: That is, a vibration reduction method for reducing vibrations generated when heavy machinery travels, the vibration reduction method includes the steps of installing a floor plate on which the heavy machinery travels, and installing a synthetic resin mesh sheet disposed below the floor plate and having a plurality of through holes formed therethrough in the up-down direction, the mesh sheet having a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is installed, the lower contact portions are not present directly below at least some of the plurality of upper contact portions when the mesh sheet is not deformed, and the mesh sheet has an inclined portion that inclines from the upper contact portions toward the lower contact portions.
本発明によれば、網状シートが変形していない状態において複数の上側接触部の少なくとも一部の直下に下側接触部が存在しないので、上側接触部から網状シートに加えられる荷重を水平方向に分散して吸収することによって、網状シートが比較的薄くても重機が走行する際の振動を効果的に低減することができる。また、本発明によれば、網状シートを薄くすることができるので、重機が走行する際の網状シートの変形量が少なく、重機が安定して走行することができる。 According to the present invention, since there is no lower contact portion directly below at least some of the multiple upper contact portions when the mesh sheet is not deformed, the load applied to the mesh sheet from the upper contact portions is horizontally dispersed and absorbed, so that vibrations caused when heavy machinery travels can be effectively reduced even if the mesh sheet is relatively thin. In addition, according to the present invention, the mesh sheet can be made thin, so that the amount of deformation of the mesh sheet when the heavy machinery travels is small, allowing the heavy machinery to travel stably.
以下、本発明に従って構成された振動低減材の好適実施形態について図面を参照しつつ説明する。 Below, a preferred embodiment of a vibration-reducing material constructed according to the present invention will be described with reference to the drawings.
図１に示すとおり、振動低減材２は、上面を油圧ショベル等の重機４が走行する敷板６と、敷板６の下方に配置される合成樹脂製の網状シート８とを備える。図示の実施形態では、１枚の網状シート８が地面の上に設置されているが、網状シート８と地面との間に付加敷板（たとえば敷板６と同一の板）が設置されていてもよい。網状シート８の上方および下方に敷板６を配置する（敷板６で網状シート８を挟みこむ）ことにより、網状シート８の劣化を抑制すると共に、振動低減効果を高めることができる。また、敷板６と地面との間において、網状シート８が２枚以上積層されていてもよい。 As shown in FIG. 1, the vibration reduction material 2 comprises a floor plate 6 on which a heavy machine 4 such as a hydraulic excavator runs, and a synthetic resin mesh sheet 8 disposed below the floor plate 6. In the illustrated embodiment, one mesh sheet 8 is placed on the ground, but an additional floor plate (for example, the same plate as the floor plate 6) may be placed between the mesh sheet 8 and the ground. By placing the floor plates 6 above and below the mesh sheet 8 (sandwiching the mesh sheet 8 between the floor plates 6), deterioration of the mesh sheet 8 can be suppressed and the vibration reduction effect can be enhanced. In addition, two or more mesh sheets 8 may be stacked between the floor plate 6 and the ground.
敷板６は、長方形状の鋼板等の適宜の金属材料から形成され得る。網状シート８は、重機４が敷板６の上面を走行する際の振動を吸収するものである。長方形状に形成され得る網状シート８の寸法は、たとえば、幅１～２ｍ程度、長さ１０ｍ程度、厚さ１０ｍｍ程度でよい。 The floor plate 6 may be formed from a suitable metal material such as a rectangular steel plate. The mesh sheet 8 absorbs vibrations when the heavy equipment 4 travels over the top surface of the floor plate 6. The dimensions of the mesh sheet 8, which may be formed into a rectangular shape, may be, for example, about 1 to 2 m wide, about 10 m long, and about 10 mm thick.
網状シート８は、種々の合成樹脂から形成され得る。網状シート８用の合成樹脂としては、熱可塑性樹脂（たとえばオレフィン系樹脂、シリコン樹脂等）または熱硬化性樹脂（たとえばウレタン樹脂、イミド樹脂等）のいずれでもよい。合成樹脂の中でも、ゴム弾性を有するエラストマーから網状シート８が形成されているのが振動低減効果の観点から好適である。また、ゴム弾性を有するエラストマーから網状シート８が形成されている場合には、はさみ等を用いて簡単に裁断することができるので所要の大きさに調整することが容易であると共に、帯状の網状シート８を円筒状に容易に巻くことができ、網状シート８の運搬や設置、撤去、収容等を容易に行うことができる。 The mesh sheet 8 can be made of various synthetic resins. The synthetic resin for the mesh sheet 8 may be either a thermoplastic resin (e.g., olefin resin, silicone resin, etc.) or a thermosetting resin (e.g., urethane resin, imide resin, etc.). Among synthetic resins, it is preferable that the mesh sheet 8 is made of an elastomer having rubber elasticity from the viewpoint of vibration reduction effect. In addition, when the mesh sheet 8 is made of an elastomer having rubber elasticity, it can be easily cut using scissors or the like, so that it is easy to adjust to the required size, and the strip-shaped mesh sheet 8 can be easily rolled up into a cylindrical shape, so that the mesh sheet 8 can be easily transported, installed, removed, stored, etc.
図２および図３を参照して説明すると、図示の実施形態の網状シート８は、複数の上段筋１０と、複数の上段筋１０の下方に位置する複数の下段筋１２とを含む２段構造である。図２を参照することによって理解されるとおり、上段筋１０および下段筋１２は、互いに異なる位相で所定方向に延びる正弦波状に形成されている。 Referring to Figures 2 and 3, the mesh sheet 8 of the illustrated embodiment has a two-tier structure including multiple upper tier reinforcements 10 and multiple lower tier reinforcements 12 located below the multiple upper tier reinforcements 10. As can be understood by referring to Figure 2, the upper tier reinforcements 10 and the lower tier reinforcements 12 are formed in a sine wave shape that extends in a predetermined direction with different phases from each other.
図２に矢印Ｘで示す方向をＸ軸とし、図２に矢印Ｙで示す方向（Ｘ軸に直交する方向）をＹ軸とし、図２における上方をＹ軸の正の方向とすると、各上段筋１０の波形最大値（Ｙ軸方向最大値）は…、Ｘ２、Ｘ４、…の各点に位置し、各下段筋１２の波形最大値（Ｙ軸方向最大値）は…、Ｘ１、Ｘ３、…の各点に位置しており、各上段筋１０および各下段筋１２は、互いに異なる位相でＸ軸方向に延びる正弦波状に形成されている。なお、上段筋１０の振幅Ａ１と下段筋１２の振幅Ａ２とは、同一であってもよく相違していてもよい。また、図示の実施形態の上段筋１０のそれぞれは下段筋１２の３本に連結されているが、各上段筋１０は下段筋１２の４本以上に連結されていてもよい。 2 is the X-axis, the direction indicated by the arrow X in FIG. 2 (direction perpendicular to the X-axis) is the Y-axis, and the upward direction in FIG. 2 is the positive direction of the Y-axis. The waveform maximum value (maximum value in the Y-axis direction) of each upper muscle 10 is located at each point ..., X2 , X4 , ..., and the waveform maximum value (maximum value in the Y-axis direction) of each lower muscle 12 is located at each point ..., X1 , X3 , ..., and each upper muscle 10 and each lower muscle 12 are formed in a sine wave shape extending in the X-axis direction with different phases. Note that the amplitude A1 of the upper muscle 10 and the amplitude A2 of the lower muscle 12 may be the same or different. In addition, each upper muscle 10 in the illustrated embodiment is connected to three lower muscles 12, but each upper muscle 10 may be connected to four or more lower muscles 12.
網状シート８は、敷板６の下面と接触する複数の上側接触部と、網状シート８が設置される設置面（地面または適宜の板の上面）と接触する複数の下側接触部とを有し、網状シート８が変形していない状態において複数の上側接触部の少なくとも一部の直下には下側接触部が存在しないのが重要である。網状シート８の上側接触部および下側接触部は、それぞれ網状シート８が変形していない状態における網状シート８の上端部分および下端部分である。 The mesh sheet 8 has multiple upper contact portions that contact the underside of the floor plate 6 and multiple lower contact portions that contact the installation surface (the ground or the upper surface of an appropriate plate) on which the mesh sheet 8 is installed, and it is important that no lower contact portions are present directly below at least some of the multiple upper contact portions when the mesh sheet 8 is in an undeformed state. The upper and lower contact portions of the mesh sheet 8 are the upper and lower end portions, respectively, of the mesh sheet 8 when the mesh sheet 8 is in an undeformed state.
網状シート８は合成樹脂製であり、振動低減材２の上を重機が走行する際や、網状シート８の上に敷板６が載せられた際等には網状シート８が変形し得るところ、図示の実施形態の網状シート８においては、重機の走行等に起因する網状シート８の変形が生じていない状態において、上側接触部の少なくとも一部の直下に下側接触部が存在しないようになっており、網状シート８が変形した時には上側接触部の直下に下側接触部が存在していてもよい。 The mesh sheet 8 is made of synthetic resin, and may be deformed when heavy machinery runs over the vibration-reducing material 2 or when a floor plate 6 is placed on the mesh sheet 8. In the mesh sheet 8 of the illustrated embodiment, when there is no deformation of the mesh sheet 8 due to the running of heavy machinery, etc., there is no lower contact portion directly below at least a part of the upper contact portion, and when the mesh sheet 8 is deformed, there may be a lower contact portion directly below the upper contact portion.
図示の実施形態においては、図３（ａ）～図３（ｅ）に示すとおり、各上段筋１０は、敷板６の下面と接触する複数の上側接触部１０ａ、１０ｂ、１０ｃ、１０ｄ、１０ｅ、…を有する。各下段筋１２は、網状シート８が設置される面（地面または適宜の板の上面）と接触する複数の下側接触部１２ａ、１２ｂ、１２ｃ、１２ｄ、１２ｅ、…を有する。なお、上側接触部１０ａ～１０ｅ、下側接触部１２ａ～１２ｅは、網状シート８の上側接触部および下側接触部の一部であり、網状シート８の上側接触部および下側接触部がこれらに限定されるものではない。 In the illustrated embodiment, as shown in Figures 3(a) to 3(e), each upper reinforcement 10 has multiple upper contact portions 10a, 10b, 10c, 10d, 10e, ... that contact the underside of the floor plate 6. Each lower reinforcement 12 has multiple lower contact portions 12a, 12b, 12c, 12d, 12e, ... that contact the surface on which the mesh sheet 8 is installed (the ground or the upper surface of an appropriate board). Note that the upper contact portions 10a to 10e and the lower contact portions 12a to 12e are part of the upper and lower contact portions of the mesh sheet 8, and the upper and lower contact portions of the mesh sheet 8 are not limited to these.
図２、図３（ａ）および図３（ｅ）を参照して説明を続けると、各上段筋１０および各下段筋１２の断面は矩形状であり、各上段筋１０および各下段筋１２は捻じれている。そして、網状シート８は、上側接触部１０ａから下側接触部１２ａに向かって横方向片側（図３における左側）に傾斜する片側傾斜部１４と、上側接触部１０ｅから下側接触部１２ｅに向かって横方向他側（図３における右側）に傾斜する他側傾斜部１６とを有する。このように、図示の実施形態の網状シート８は、片側傾斜部１４および他側傾斜部１６を有していることによって、上側接触部１０ａ、１０ｅの直下に下側接触部１２ａ、１２ｅが存在しないようになっている。 Continuing the explanation with reference to Figures 2, 3(a) and 3(e), each upper reinforcing bar 10 and each lower reinforcing bar 12 has a rectangular cross section, and each upper reinforcing bar 10 and each lower reinforcing bar 12 is twisted. The mesh sheet 8 has a one-side inclined portion 14 that inclines from the upper contact portion 10a to the lower contact portion 12a to one side (left side in Figure 3), and an other-side inclined portion 16 that inclines from the upper contact portion 10e to the lower contact portion 12e to the other side (right side in Figure 3). In this way, the mesh sheet 8 of the illustrated embodiment has a one-side inclined portion 14 and an other-side inclined portion 16, so that the lower contact portions 12a and 12e do not exist directly below the upper contact portions 10a and 10e.
網状シート８においては、図３（ｂ）および図３（ｄ）に示すとおり、上段筋１０の直下に下段筋１２が位置しておらず、上側接触部１０ｂ、１０ｄの直下に下側接触部１２ｂ、１２ｄが存在していない。また、図３（ｃ）に示す端面においては、上段筋１０の直下に下段筋１２が位置しているが、上側接触部１０ｃの位置と下側接触部１２ｃの位置とが若干ずれており、上側接触部１０ｃの直下に下側接触部１２ｃが存在していない。 As shown in Figures 3(b) and 3(d), in the mesh sheet 8, the lower reinforcing bars 12 are not located directly below the upper reinforcing bars 10, and the lower contact portions 12b and 12d are not located directly below the upper contact portions 10b and 10d. In addition, in the end surface shown in Figure 3(c), the lower reinforcing bars 12 are located directly below the upper reinforcing bars 10, but the positions of the upper contact portion 10c and the lower contact portion 12c are slightly misaligned, and the lower contact portion 12c is not located directly below the upper contact portion 10c.
このように、図示の実施形態の振動低減材２においては、網状シート８の上側接触部１０ａ～１０ｅの直下に下側接触部１２ａ～１２ｅが存在しないことによって、上側接触部１０ａ～１０ｅから網状シート８に加えられる荷重を水平方向に分散して吸収することによって、網状シート８が比較的薄くても重機４が走行する際の振動を効果的に低減することができる。また、振動低減材２においては、網状シート８を薄くすることができるので、重機４が走行する際の網状シート８の変形量が少なく、重機４が安定して走行することができる。 In this way, in the vibration-reducing material 2 of the illustrated embodiment, the lower contact portions 12a-12e are not present directly below the upper contact portions 10a-10e of the mesh sheet 8, and therefore the load applied to the mesh sheet 8 from the upper contact portions 10a-10e is horizontally dispersed and absorbed, thereby effectively reducing vibrations when the heavy equipment 4 travels, even if the mesh sheet 8 is relatively thin. Furthermore, in the vibration-reducing material 2, the mesh sheet 8 can be made thin, so that the amount of deformation of the mesh sheet 8 when the heavy equipment 4 travels is small, allowing the heavy equipment 4 to travel stably.
上述の実施形態の網状シート８は上段筋１０および下段筋１２を有する２段構造であるが、本発明の網状シートは単段構造であってもよい。また、網状シート８の上段筋１０および下段筋１２は正弦波状以外の形態であってもよい。本発明の網状シートは、たとえば、それぞれ真直に延びる上段筋および下段筋が交差して網状をなしていてよく、この場合における上段筋と下段筋との網目形状は矩形状、菱形状、亀甲形状等の任意の形状が採用され得る。 The mesh sheet 8 in the above embodiment has a two-stage structure with upper and lower reinforcing bars 10 and 12, but the mesh sheet of the present invention may have a single-stage structure. Furthermore, the upper and lower reinforcing bars 10 and 12 of the mesh sheet 8 may have a shape other than a sinusoidal wave shape. The mesh sheet of the present invention may have, for example, upper and lower reinforcing bars that each extend straight and cross each other to form a mesh shape, and in this case, the mesh shape of the upper and lower reinforcing bars may be any shape, such as a rectangular shape, a diamond shape, or a tortoiseshell shape.
ここで、本発明の実施例について図４を参照して説明する。実施例１は、オレフィン系熱可塑性エラストマーを用いて図２および図３に示すとおりの形状で製作した厚み１０ｍｍの網状シートであり、比較例１は、実施例１と同一の材料を用いて製作した厚み１０ｍｍの無孔シートである。実施例２は、実施例１よりも柔らかいオレフィン系熱可塑性エラストマーを用いて図２および図３に示すとおりの形状（実施例１と同一の形状）で製作した厚み１０ｍｍの網状シートであり、比較例２は、実施例２と同一の材料を用いて製作した厚み１０ｍｍの無孔シートである。 Here, examples of the present invention will be described with reference to FIG. 4. Example 1 is a 10 mm thick mesh sheet made with an olefin-based thermoplastic elastomer in the shape shown in FIG. 2 and FIG. 3, and Comparative Example 1 is a 10 mm thick non-porous sheet made with the same material as Example 1. Example 2 is a 10 mm thick mesh sheet made with an olefin-based thermoplastic elastomer that is softer than Example 1 in the shape shown in FIG. 2 and FIG. 3 (the same shape as Example 1), and Comparative Example 2 is a 10 mm thick non-porous sheet made with the same material as Example 2.
実施例１および２ならびに比較例１および２のそれぞれについて、ＪＩＳ Ｋ ６３９４：２００７に準拠した測定方法によって損失正接tanδを測定した。損失正接tanδは振動低減効果を示すひとつの指標であり、損失正接tanδの値が大きいほど振動低減効果が高いと考えられる。なお、損失正接tanδを測定した際の試験温度は２３℃であり、測定周波数は１～１００Ｈｚであり、静的荷重は１５０ｋＰａである。 For each of Examples 1 and 2 and Comparative Examples 1 and 2, the loss tangent tan δ was measured by a measurement method conforming to JIS K 6394:2007. The loss tangent tan δ is an index of the vibration reduction effect, and it is considered that the larger the value of the loss tangent tan δ, the higher the vibration reduction effect. The test temperature when measuring the loss tangent tan δ was 23°C, the measurement frequency was 1 to 100 Hz, and the static load was 150 kPa.
図４に示すとおり、実施例１の損失正接tanδは０．１４～０．１６であり、比較例１の損失正接tanδは０．０８～０．１１であり、比較例１よりも実施例１の方が損失正接tanδの値が大きかった。また、実施例２の損失正接tanδは０．１４～０．１６であり、比較例２の損失正接tanδは０．１１～０．１４であり、比較例２よりも実施例２の方が損失正接tanδの値が大きかった。したがって、図２および図３に示す形状で製作した網状シートは、同一の材料で製作した無孔シートよりも振動低減効果が高いといえる。 As shown in Figure 4, the loss tangent tan δ of Example 1 was 0.14 to 0.16, and the loss tangent tan δ of Comparative Example 1 was 0.08 to 0.11, so Example 1 had a larger loss tangent tan δ value than Comparative Example 1. Furthermore, the loss tangent tan δ of Example 2 was 0.14 to 0.16, and the loss tangent tan δ of Comparative Example 2 was 0.11 to 0.14, so Example 2 had a larger loss tangent tan δ value than Comparative Example 2. Therefore, it can be said that the mesh sheet manufactured in the shape shown in Figures 2 and 3 has a higher vibration reduction effect than a non-perforated sheet manufactured from the same material.
なお、実施例１および２の硬さを測定したところ、図４に示すとおり、実施例１の材料は硬さ９０（デュロメーターＡ）であり、実施例２の材料は硬さ５３（デュロメーターＡ）であった。また、静的荷重１５０ｋＰａを加えた際の実施例１および２のひずみ率を測定したところ、実施例１は１６％であり、実施例２は５０％であった。 When the hardness of Examples 1 and 2 was measured, the material of Example 1 had a hardness of 90 (Durometer A), and the material of Example 2 had a hardness of 53 (Durometer A), as shown in Figure 4. In addition, when the strain rate of Examples 1 and 2 was measured when a static load of 150 kPa was applied, it was 16% for Example 1 and 50% for Example 2.
また、実施例１の網状シートを未舗装の地面と鋼鉄製の敷板との間に敷設して、敷板の上面を重機が走行した際の振動レベルを測定すると共に、網状シートを除去して未舗装の地面に敷設した鋼鉄製の敷板の上面を重機が走行した際の振動レベルを測定した。 The mesh sheet of Example 1 was also laid between an unpaved ground and a steel floor plate, and the vibration level was measured when heavy machinery ran over the top surface of the floor plate. The mesh sheet was also removed, and the vibration level was measured when heavy machinery ran over the top surface of the steel floor plate laid on the unpaved ground.
図５（ａ）には、合成ゴム製パッドをクローラに装着した４．９トンクラス（吊上能力）のクローラクレーンが走行した際の振動レベルが示されており、図５（ｂ）には、合成ゴム製パッドをクローラに装着した０．２５ｍ３クラス（バケット容量）の油圧ショベルが走行した際の振動レベルが示されており、図５（ｃ）には、４トンクラス（機体質量）の振動ローラが走行した際の振動レベルが示されている。図５（ａ）～図５（ｃ）においては、実施例１の網状シートを敷設した場合（網状シートあり）の振動レベルが実線で示されており、網状シートを除去した場合（網状シートなし）の振動レベルが点線で示されている。 Fig. 5(a) shows the vibration level when a 4.9 ton class (lifting capacity) crawler crane with synthetic rubber pads attached to its crawlers runs, Fig. 5(b) shows the vibration level when a 0.25 m3 class (bucket capacity) hydraulic excavator with synthetic rubber pads attached to its crawlers runs, and Fig. 5(c) shows the vibration level when a 4 ton class (machine mass) vibrating roller runs. In Figs. 5(a) to 5(c), the vibration level when the mesh sheet of Example 1 is laid (with mesh sheet) is shown by a solid line, and the vibration level when the mesh sheet is removed (without mesh sheet) is shown by a dotted line.
図６には、図５（ａ）～図５（ｃ）における実線の最大値（実施例１の網状シートを敷設した場合（網状シートあり）における振動レベルの最大値）と、図５（ａ）～図５（ｃ）における点線の最大値（実施例１の網状シートを除去した場合（網状シートなし）における振動レベルの最大値）と、それぞれの最大値同士の差が示されている。図６に示すとおり、網状シートを敷設すると、４．９トンクラスのクローラクレーンの走行時の振動レベルの最大値が６ｄＢ低減し、０．２５ｍ３クラスの油圧ショベルの走行時の振動レベルの最大値が１４ｄＢ低減し、４トンクラスの振動ローラの走行時の振動レベルの最大値が２０ｄＢ低減した。 FIG. 6 shows the difference between the maximum values of the solid lines in FIGS. 5(a) to 5(c) (the maximum value of the vibration level when the mesh sheet of Example 1 was laid (with mesh sheet)) and the maximum value of the dotted lines in FIGS. 5(a) to 5(c) (the maximum value of the vibration level when the mesh sheet of Example 1 was removed (without mesh sheet)). As shown in FIG. 6, when the mesh sheet was laid, the maximum value of the vibration level when a 4.9-ton crawler crane was traveling was reduced by 6 dB, the maximum value of the vibration level when a 0.25 m3 hydraulic excavator was traveling was reduced by 14 dB, and the maximum value of the vibration level when a 4-ton vibrating roller was traveling was reduced by 20 dB.
次に、本発明の振動低減方法の好適実施形態について説明する。本実施形態では、まず、振動低減材２を設置する地面を造成する造成工程を実施する。造成工程では、振動低減材２を設置する地面を平滑に成型し、または、砕石等を敷き詰めて均す。 Next, a preferred embodiment of the vibration reduction method of the present invention will be described. In this embodiment, first, a ground preparation step is carried out to prepare the ground on which the vibration reduction material 2 is to be installed. In the preparation step, the ground on which the vibration reduction material 2 is to be installed is molded smoothly or is leveled by laying crushed stone or the like.
造成工程を実施した後、造成した地面に網状シート８を設置する網状シート設置工程を実施する。網状シート設置工程では、まず、円筒状に巻かれて梱包された網状シート８を設置位置近くの地面に荷下ろしする。次いで、円筒状に巻かれた網状シート８を人力等で展開する。この際は、網状シート８のずれ防止のため必要に応じて地面にアンカー等で網状シート８を固定するのが好ましい。また、網状シート８の相互のずれ防止のため必要に応じて溶着や接着等により網状シート８を相互に固定してもよい。 After the construction step is performed, a mesh sheet installation step is performed in which the mesh sheet 8 is installed on the constructed ground. In the mesh sheet installation step, first, the mesh sheet 8 that has been rolled up into a cylindrical shape and packed is unloaded onto the ground near the installation position. Next, the cylindrically rolled mesh sheet 8 is unfolded by human power or the like. At this time, it is preferable to fix the mesh sheet 8 to the ground with anchors or the like as necessary to prevent the mesh sheet 8 from shifting. In addition, the mesh sheets 8 may be fixed to each other by welding, adhesive, or the like as necessary to prevent the mesh sheets 8 from shifting relative to each other.
網状シート設置工程を実施した後、地面上に設置した網状シート８の上に敷板６を設置する敷板設置工程を実施する。敷板設置工程では、たとえば、敷板６にフック（図示していない。）を設け、クレーン等の揚重機により敷板６を吊り下げ、地面上に設置した網状シート８の上に敷板６を設置する。敷板６の相互のずれ防止のため必要に応じて溶接等により敷板６を相互に固定するのが好適である。これにより、敷板６の上部を走行する重機の安定走行が可能となる。これら網状シート設置工程および敷板設置工程により、振動低減材２を構築することができる。 After the mesh sheet installation process is performed, a plate installation process is performed in which a floor plate 6 is installed on the mesh sheet 8 installed on the ground. In the plate installation process, for example, a hook (not shown) is provided on the floor plate 6, and the floor plate 6 is hung by a lifting machine such as a crane, and the floor plate 6 is installed on the mesh sheet 8 installed on the ground. To prevent the floor plates 6 from shifting relative to each other, it is preferable to fix the floor plates 6 to each other by welding or the like as necessary. This allows for stable travel of heavy machinery traveling on top of the floor plates 6. Vibration reduction material 2 can be constructed by the mesh sheet installation process and the plate installation process.
なお、網状シート８の下方に付加敷板を設置する場合には、前記造成工程を実施した後、造成した地面に付加敷板を設置する付加敷板設置工程を実施する。付加敷板設置工程は、付加敷板（敷板６と同一の板でよい。）にフックを設け、クレーン等の揚重機により付加敷板を吊り下げ、地面上に設置する。付加敷板の相互のずれ防止のため必要に応じて溶接等により付加敷板を相互に固定してもよい。そして、付加敷板設置工程を実施した後、前記網状シート設置工程および前記敷板設置工程を順に実施する。これによって、敷板６と付加敷板とで網状シート８を挟みこむ形態の振動低減材を構築することができる。このような方法で構築された振動低減材２により、振動低減材２の上面を油圧ショベル等の重機４が走行する際に、実施例１記載のとおり、振動を効果的に低減させることができ、安定した走行が確保される。 When an additional floor plate is installed below the mesh sheet 8, the above construction step is followed by an additional floor plate installation step in which the additional floor plate is installed on the developed ground. In the additional floor plate installation step, a hook is provided on the additional floor plate (which may be the same as floor plate 6), and the additional floor plate is hung by a lifting machine such as a crane and installed on the ground. To prevent the additional floor plates from shifting relative to each other, the additional floor plates may be fixed to each other by welding or the like as necessary. After the additional floor plate installation step is performed, the mesh sheet installation step and the floor plate installation step are performed in sequence. This allows the construction of a vibration reduction material in which the mesh sheet 8 is sandwiched between the floor plate 6 and the additional floor plate. With the vibration reduction material 2 constructed in this manner, when a heavy machine 4 such as a hydraulic excavator runs on the top surface of the vibration reduction material 2, the vibration can be effectively reduced as described in Example 1, ensuring stable running.
２：振動低減材
４：重機
６：敷板
８：網状シート
１０：上段筋
１２：下段筋
１０ａ、１０ｂ、１０ｃ、１０ｄ、１０ｅ：上側接触部
１２ａ、１２ｂ、１２ｃ、１２ｄ、１２ｅ：下側接触部
１４：片側傾斜部
１６：他側傾斜部
2: Vibration-reducing material 4: Heavy machinery 6: Floor plate 8: Mesh sheet 10: Upper reinforcement 12: Lower reinforcement 10a, 10b, 10c, 10d, 10e: Upper contact portion 12a, 12b, 12c, 12d, 12e: Lower contact portion 14: One-side inclined portion 16: Other-side inclined portion
Claims (6)
上面を重機が走行する敷板と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートとを備え、
前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、
前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、
前記網状シートは、複数の上段筋と、前記複数の上段筋の下方に位置する複数の下段筋とを含み、前記上段筋および前記下段筋は互いに異なる位相で所定方向に延びる正弦波状に形成されており、前記上段筋のそれぞれは前記下段筋の３本以上に連結されている振動低減材。 A vibration damping material for reducing vibrations when heavy machinery is traveling,
The present invention comprises a base plate on which heavy machinery runs, and a synthetic resin mesh sheet disposed below the base plate and having a plurality of through holes extending vertically therethrough;
The mesh sheet has a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is placed,
When the mesh sheet is not deformed, the lower contact portion is not present directly below at least some of the upper contact portions,
The mesh sheet is a vibration-reducing material that includes a plurality of upper level reinforcements and a plurality of lower level reinforcements located below the plurality of upper level reinforcements, the upper level reinforcements and the lower level reinforcements are formed in a sine wave shape extending in a predetermined direction at different phases from each other, and each of the upper level reinforcements is connected to three or more of the lower level reinforcements .
上面を重機が走行する敷板と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートとを備え、
前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、
前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、
前記網状シートは、前記上側接触部から前記下側接触部に向かって傾斜する傾斜部を有する振動低減材。 A vibration damping material for reducing vibrations when heavy machinery is traveling,
The present invention comprises a base plate on which heavy machinery runs, and a synthetic resin mesh sheet disposed below the base plate and having a plurality of through holes extending vertically therethrough;
The mesh sheet has a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is placed,
When the mesh sheet is not deformed, the lower contact portion is not present directly below at least some of the upper contact portions,
The mesh sheet is a vibration-damping material having an inclined portion that slopes from the upper contact portion toward the lower contact portion .
上面を重機が走行する敷板を設置する工程と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートを設置する工程とを含み、
前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、
前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、
前記網状シートは、複数の上段筋と、前記複数の上段筋の下方に位置する複数の下段筋とを含み、前記上段筋および前記下段筋は互いに異なる位相で所定方向に延びる正弦波状に形成されており、前記上段筋のそれぞれは前記下段筋の３本以上に連結されている振動低減方法。 A vibration reduction method for reducing vibration when a heavy machine travels, comprising:
The method includes the steps of: installing a base plate on which heavy machinery runs; and installing a synthetic resin mesh sheet that is disposed below the base plate and has a plurality of through holes that extend vertically through the base plate.
The mesh sheet has a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is placed,
When the mesh sheet is not deformed, the lower contact portion is not present directly below at least some of the upper contact portions,
A vibration reduction method in which the mesh sheet includes a plurality of upper level muscles and a plurality of lower level muscles located below the plurality of upper level muscles, the upper level muscles and the lower level muscles are formed in a sine wave shape extending in a predetermined direction at different phases from each other, and each of the upper level muscles is connected to three or more of the lower level muscles .
上面を重機が走行する敷板を設置する工程と、前記敷板の下方に配置され上下方向に貫通する複数の貫通穴が形成された合成樹脂製の網状シートを設置する工程とを含み、
前記網状シートは、前記敷板の下面と接触する複数の上側接触部と、前記網状シートが設置される面と接触する複数の下側接触部とを有し、
前記網状シートが変形していない状態において前記複数の上側接触部の少なくとも一部の直下には前記下側接触部が存在せず、
前記網状シートは、前記上側接触部から前記下側接触部に向かって傾斜する傾斜部を有する振動低減方法。 A vibration reduction method for reducing vibration when a heavy machine travels, comprising:
The method includes the steps of: installing a base plate on which heavy machinery runs; and installing a synthetic resin mesh sheet that is disposed below the base plate and has a plurality of through holes extending vertically therethrough;
The mesh sheet has a plurality of upper contact portions that contact the lower surface of the floor plate and a plurality of lower contact portions that contact the surface on which the mesh sheet is placed,
When the mesh sheet is not deformed, the lower contact portion is not present directly below at least some of the upper contact portions,
The mesh sheet has an inclined portion that slopes from the upper contact portion toward the lower contact portion .
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| JP2020169546A JP7568465B2 (en) | 2020-10-07 | 2020-10-07 | Vibration damping material |
| PCT/JP2021/033497 WO2022075009A1 (en) | 2020-10-07 | 2021-09-13 | Vibration reducing material |
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| JP2020169546A JP7568465B2 (en) | 2020-10-07 | 2020-10-07 | Vibration damping material |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3152250U (en) | 2009-05-13 | 2009-07-23 | 株式会社ジェイエスピー | Anti-vibration mat for heavy machinery |
| JP2011190653A (en) | 2010-03-16 | 2011-09-29 | Ohbayashi Corp | Method of suppressing construction vibration |
| JP2014034813A (en) | 2012-08-09 | 2014-02-24 | Inoac Corp | Vibration isolation structure with heavy machine placed thereon |
| JP2020118012A (en) | 2019-01-25 | 2020-08-06 | 佐藤工業株式会社 | Anti-vibration mat for work on heavy machinery |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS618130U (en) * | 1984-06-19 | 1986-01-18 | トヨタ自動車株式会社 | Vibration damping composite steel plate |
| JPS6237144A (en) * | 1985-08-12 | 1987-02-18 | 松下電工株式会社 | Cushion material |
| JPH084482Y2 (en) * | 1990-11-21 | 1996-02-07 | 早川ゴム株式会社 | Shock absorbing sheet |
| JPH05272588A (en) * | 1992-03-30 | 1993-10-19 | Matsushita Electric Works Ltd | Vibration damping material |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3152250U (en) | 2009-05-13 | 2009-07-23 | 株式会社ジェイエスピー | Anti-vibration mat for heavy machinery |
| JP2011190653A (en) | 2010-03-16 | 2011-09-29 | Ohbayashi Corp | Method of suppressing construction vibration |
| JP2014034813A (en) | 2012-08-09 | 2014-02-24 | Inoac Corp | Vibration isolation structure with heavy machine placed thereon |
| JP2020118012A (en) | 2019-01-25 | 2020-08-06 | 佐藤工業株式会社 | Anti-vibration mat for work on heavy machinery |
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