WO2022075009A1

WO2022075009A1 - Vibration reducing material

Info

Publication number: WO2022075009A1
Application number: PCT/JP2021/033497
Authority: WO
Inventors: 正貴青山; 淳市弘中; 亮太小川; 英基永谷; 一成佐藤; 詩瑶中本
Original assignee: 三井化学産資株式会社
Priority date: 2020-10-07
Filing date: 2021-09-13
Publication date: 2022-04-14
Also published as: JP2022061557A

Abstract

Provided is a vibration reducing material with which it is possible to effectively reduce vibrations associated with the traveling of a heavy machine, and to enable the heavy machine to travel stably. A vibration reducing material 2 comprises a plank 6 on which a heavy machine 4 travels, and a netted sheet 8 made of synthetic resin and disposed under the plank 6. The netted sheet 8 has a plurality of upper contact parts 10a to 10e in contact with the lower surface of the plank 6, and a plurality of lower contact parts 12a to 12e in contact with the surface on which the netted sheet 8 is provided. In a state in which the netted sheet 8 is not deformed, the lower connection parts 12a to 12e are not present immediately under at least some of the plurality of upper connection parts 10a to 10e.

Description

Vibration reduction material

The present invention relates to a vibration reducing material and a vibration reducing method for reducing vibration when a heavy machine such as a crawler crane or a hydraulic excavator travels.

The following Patent Document 1 discloses a vibration reducing material for reducing vibration when a heavy machine travels at a construction site or the like. This vibration reducing material is composed of an open cell polyurethane foam which is a thermosetting resin and a floor plate placed on the open cell polyurethane foam. In this vibration reducing material, the vibration when the heavy machine runs on the floor plate is absorbed by the open cell polyurethane foam.

Japanese Patent No. 6030376

However, in the above-mentioned vibration reducing material, in order to effectively reduce the vibration when the heavy machine runs, it is necessary to make the thickness of the polyurethane foam relatively thick (about 50 to 150 mm). There is a problem that the polyurethane foam is deformed by the weight and it is difficult to stabilize the running of heavy machinery.

The subject of the present invention made in view of the above facts is a vibration reducing material and a vibration reducing method capable of effectively reducing vibration when a heavy machine travels and allowing the heavy machine to travel stably. To provide.

According to the first aspect of the present invention, the following vibration reducing material that solves the above problems is provided. That is, it is a vibration reducing material for reducing vibration when a heavy machine travels, and includes a floor plate on which the heavy equipment travels on the upper surface and a synthetic resin mesh sheet arranged below the floor plate. The sheet has a plurality of upper contact portions that come into contact with the lower surface of the floor plate and a plurality of lower contact portions that come into contact with the surface on which the mesh sheet is installed. A vibration reducing material is provided in which the lower contact portion does not exist immediately below at least a part of the plurality of upper contact portions.

Preferably, the reticulated sheet includes a plurality of upper streaks and a plurality of lower streaks located below the plurality of upper streaks. The upper muscle and the lower muscle are formed in a sinusoidal shape extending in a predetermined direction in different phases, and it is preferable that each of the upper muscles is connected to three or more of the lower muscles. It is desirable that the net-like sheet has an inclined portion inclined from the upper contact portion toward the lower contact portion. It is convenient that the reticulated sheet is made of an elastomer. It is preferable that the additional floor plate is arranged below the net-like sheet.

According to the second aspect of the present invention, the following vibration reduction method for solving the above problems is provided. That is, it is a vibration reduction method for reducing vibration when a heavy machine travels, and a process of installing a floor plate on which the heavy equipment travels on the upper surface and a synthetic resin mesh sheet arranged below the floor plate are installed. The mesh sheet has a plurality of upper contact portions in contact with the lower surface of the floor plate and a plurality of lower contact portions in contact with the surface on which the mesh sheet is installed. Provided is a vibration reducing method in which the lower contact portion does not exist directly under at least a part of the plurality of upper contact portions in a state where the lower contact portion is not deformed.

According to the present invention, since the lower contact portion does not exist directly under at least a part of the plurality of upper contact portions in the state where the mesh sheet is not deformed, the load applied to the mesh sheet from the upper contact portion is applied in the horizontal direction. By dispersing and absorbing the reticulated sheet, it is possible to effectively reduce the vibration when the heavy machine runs even if the reticulated sheet is relatively thin. Further, according to the present invention, since the mesh sheet can be made thin, the amount of deformation of the mesh sheet when the heavy machine travels is small, and the heavy machine can travel stably.

The side view of the vibration reducing material configured according to this invention. The plan view of the net-like sheet shown in FIG. (A) AA line sectional view in FIG. 2, (b) BB line end view in FIG. 2, (c) CC line end view in FIG. 2, and (d) DD line end face in FIG. FIG. 2 (e) is a sectional view taken along line EE in FIG. 2. The table which shows the loss tangent etc. of the net-like sheet of an Example and the non-perforated sheet of a comparative example. (A) A graph showing the vibration level when the crawler crane is running, (b) a graph showing the vibration level when the hydraulic excavator is running, and (c) a graph showing the vibration level when the vibration roller is running. A table showing the maximum values of the solid line and the dotted line in FIGS. 5 (a) to 5 (c), and the difference between the maximum values.

Hereinafter, a preferred embodiment of the vibration reducing material configured according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, the vibration reducing material 2 includes a floor plate 6 on which a heavy machine 4 such as a hydraulic excavator runs on the upper surface, and a synthetic resin mesh sheet 8 arranged below the floor plate 6. In the illustrated embodiment, one mesh sheet 8 is installed on the ground, but an additional floor plate (for example, the same plate as the floor plate 6) may be installed between the mesh sheet 8 and the ground. .. By arranging the floor plate 6 above and below the net-like sheet 8 (the net-like sheet 8 is sandwiched between the floor plates 6), deterioration of the net-like sheet 8 can be suppressed and the vibration reducing effect can be enhanced. Further, two or more mesh sheets 8 may be laminated between the floor plate 6 and the ground.

The floor plate 6 can be formed of an appropriate metal material such as a rectangular steel plate. The net-like sheet 8 absorbs vibration when the heavy machine 4 travels on the upper surface of the floor plate 6. The dimensions of the mesh sheet 8 that can be formed into a rectangular shape may be, for example, about 1 to 2 m in width, about 10 m in length, and about 10 mm in thickness.

The reticulated sheet 8 can be formed from various synthetic resins. The synthetic resin for the mesh sheet 8 may be either a thermoplastic resin (for example, an olefin resin, a silicon resin, etc.) or a thermosetting resin (for example, a urethane resin, an imide resin, etc.). Among the synthetic resins, it is preferable that the net-like sheet 8 is formed from an elastomer having rubber elasticity from the viewpoint of the vibration reducing effect. Further, when the net-like sheet 8 is formed from an elastomer having rubber elasticity, it can be easily cut with scissors or the like, so that it can be easily adjusted to a required size and has a strip-like net-like shape. The sheet 8 can be easily wound into a cylindrical shape, and the net-like sheet 8 can be easily transported, installed, removed, and housed.

Explaining with reference to FIGS. 2 and 3, the mesh sheet 8 of the illustrated embodiment has a two-stage structure including a plurality of upper streaks 10 and a plurality of lower streaks 12 located below the plurality of upper streaks 10. Is. As can be understood by referring to FIG. 2, the upper streaks 10 and the lower streaks 12 are formed in a sinusoidal shape extending in a predetermined direction in different phases.

Assuming that the direction indicated by the arrow X in FIG. 2 is the X axis, the direction indicated by the arrow Y in FIG. 2 (the direction orthogonal to the X axis) is the Y axis, and the upper direction in FIG. 2 is the positive direction of the Y axis, each upper stage is shown. The maximum waveform value (maximum value in the Y-axis direction) of the streak 10 is located at each point of ..., X ₂ , X ₄ , ..., And the maximum waveform value (maximum value in the Y-axis direction) of each lower streak 12 is ..., X ₁ , X3 _, ..., Each upper bar 10 and each lower bar 12 are formed in a sinusoidal shape extending in the X-axis direction in different phases from each other. The amplitude A1 of the upper streak ₁₀ and the amplitude _A2 of the lower streak 12 may be the same or different. Further, although each of the upper muscles 10 in the illustrated embodiment is connected to three of the lower muscles 12, each upper muscle 10 may be connected to four or more of the lower muscles 12.

The mesh sheet 8 has a plurality of upper contact portions that come into contact with the lower surface of the floor plate 6, and a plurality of lower contact portions that come into contact with the installation surface (ground or the upper surface of an appropriate plate) on which the mesh sheet 8 is installed. It is important that the lower contact portion does not exist directly under at least a part of the plurality of upper contact portions in the state where the mesh sheet 8 is not deformed. The upper contact portion and the lower contact portion of the mesh sheet 8 are an upper end portion and a lower end portion of the mesh sheet 8 in a state where the mesh sheet 8 is not deformed, respectively.

The mesh sheet 8 is made of synthetic resin, and the mesh sheet 8 may be deformed when a heavy machine runs on the vibration reducing material 2 or when the floor plate 6 is placed on the mesh sheet 8, which is shown in the figure. In the mesh sheet 8 of the embodiment, the lower contact portion does not exist directly under at least a part of the upper contact portion in a state where the mesh sheet 8 is not deformed due to the running of heavy machinery or the like. When the net-like sheet 8 is deformed, the lower contact portion may be present immediately below the upper contact portion.

In the illustrated embodiment, as shown in FIGS. 3A to 3E, each upper bar 10 has a plurality of

upper contact portions

10a, 10b, 10c, 10d, 10e, which are in contact with the lower surface of the floor plate 6. Have ... Each lower bar 12 has a plurality of

lower contact portions

12a, 12b, 12c, 12d, 12e, ... The upper contact portions 10a to 10e and the lower contact portions 12a to 12e are a part of the upper contact portion and the lower contact portion of the mesh sheet 8, and the upper contact portion and the lower contact portion of the mesh sheet 8 are these. Not limited to.

Continuing the description with reference to FIGS. 2, 3 (a) and 3 (e), the cross section of each upper bar 10 and each lower bar 12 is rectangular, and each upper bar 10 and each lower bar 12 has a rectangular shape. It's twisted. Then, the mesh sheet 8 has a one-sided inclined portion 14 that inclines laterally to one side (left side in FIG. 3) from the upper contact portion 10a toward the lower contact portion 12a, and the upper contact portion 10e toward the lower contact portion 12e. It has another side inclined portion 16 which is inclined to the other side in the lateral direction (right side in FIG. 3). As described above, since the mesh sheet 8 of the illustrated embodiment has the one-side inclined portion 14 and the other-side inclined portion 16, the

lower contact portions

12a and 12e are present immediately below the

upper contact portions

10a and 10e. It is designed not to.

In the mesh sheet 8, as shown in FIGS. 3 (b) and 3 (d), the lower streak 12 is not located directly under the upper streak 10, and the lower contact portion is directly under the

upper contact portions

10b and 10d. 12b and 12d do not exist. Further, in the end surface shown in FIG. 3C, the lower streak 12 is located directly under the upper streak 10, but the position of the upper contact portion 10c and the position of the lower contact portion 12c are slightly deviated. The lower contact portion 12c does not exist directly below the upper contact portion 10c.

As described above, in the vibration reducing material 2 of the illustrated embodiment, the lower contact portions 12a to 12e do not exist directly under the upper contact portions 10a to 10e of the mesh sheet 8, so that the upper contact portions 10a to 10e are reticulated. By distributing and absorbing the load applied to the sheet 8 in the horizontal direction, it is possible to effectively reduce the vibration when the heavy machine 4 runs even if the mesh sheet 8 is relatively thin. Further, in the vibration reducing material 2, since the mesh sheet 8 can be made thin, the amount of deformation of the mesh sheet 8 when the heavy machine 4 travels is small, and the heavy machine 4 can travel stably.

The reticulated sheet 8 of the above-described embodiment has a two-stage structure having an upper streak 10 and a lower streak 12, but the reticulated sheet of the present invention may have a single-stage structure. Further, the upper bar 10 and the lower bar 12 of the mesh sheet 8 may have a form other than the sinusoidal shape. In the mesh sheet of the present invention, for example, the upper and lower bars extending straight may intersect each other to form a mesh, and in this case, the mesh shape of the upper and lower bars is rectangular, rhombic, and hexagonal. Any shape such as can be adopted.

Here, an embodiment of the present invention will be described with reference to FIG. Example 1 is a mesh sheet having a thickness of 10 mm manufactured by using an olefin-based thermoplastic elastomer in the shapes as shown in FIGS. 2 and 3, and Comparative Example 1 is manufactured by using the same material as that of Example 1. It is a non-perforated sheet with a thickness of 10 mm. Example 2 is a mesh sheet having a thickness of 10 mm manufactured by using an olefin-based thermoplastic elastomer softer than that of Example 1 and having a shape as shown in FIGS. 2 and 3 (the same shape as that of Example 1), and is compared. Example 2 is a non-perforated sheet having a thickness of 10 mm manufactured using the same material as in Example 2.

For each of Examples 1 and 2 and Comparative Examples 1 and 2, the loss tangent tan δ was measured by a measuring method based on JIS K 6394: 2007. The loss tangent tan δ is one index showing 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 the loss tangent tan δ was measured was 23 ° C., the measurement frequency was 1 to 100 Hz, and the static load was 150 kPa.

As shown in FIG. 4, the loss tangent tan δ of Example 1 is 0.14 to 0.16, and the loss tangent tan δ of Comparative Example 1 is 0.08 to 0.11. The value of the loss tangent tan δ was larger in. Further, the loss tangent tan δ of Example 2 is 0.14 to 0.16, and the loss tangent tan δ of Comparative Example 2 is 0.11 to 0.14, and the loss of Example 2 is higher than that of Comparative Example 2. The value of tangent tan δ was large. Therefore, it can be said that the net-like sheet manufactured with the shapes shown in FIGS. 2 and 3 has a higher vibration reducing effect than the non-perforated sheet manufactured with the same material.

When the hardness of Examples 1 and 2 was measured, as shown in FIG. 4, 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). Met. Moreover, when the strain rate of Examples 1 and 2 when a static load of 150 kPa was applied was measured, it was 16% in Example 1 and 50% in Example 2.

Further, the mesh sheet of Example 1 is laid between the unpaved ground and the steel floor plate, the vibration level when the heavy machine runs on the upper surface of the floor plate is measured, and the mesh sheet is not removed. The vibration level when a heavy machine traveled on the upper surface of a steel floor plate laid on the pavement ground was measured.

FIG. 5A shows the vibration level when a 4.9-ton class (lifting capacity) crawler crane with a synthetic rubber pad attached to the crawler travels, and FIG. 5B shows the vibration level. , The vibration level when a 0.25 m ³ class (bucket capacity) hydraulic excavator with a synthetic rubber pad attached to the crawler runs is shown. FIG. 5 (c) shows the 4 ton class (airframe mass). The vibration level when the vibration roller is running is shown. In FIGS. 5A to 5C, the vibration level when the mesh sheet of Example 1 is laid (with the mesh sheet) is shown by a solid line, and when the mesh sheet is removed (without the mesh sheet). ) Vibration level is shown by the dotted line.

6 shows the maximum value of the solid line in FIGS. 5A to 5C (the maximum value of the vibration level when the mesh sheet of Example 1 is laid (with the mesh sheet)) and FIG. 5 (a). ) To the maximum value of the dotted line in FIG. 5 (c) (the maximum value of the vibration level when the reticulated sheet of Example 1 is removed (without the reticulated sheet)) and the difference between the respective maximum values are shown. As shown in Fig. 6, when the mesh sheet is laid, the maximum vibration level of the 4.9-ton class crawler crane during travel is reduced by 6 dB, and the maximum vibration level of the 0.25 ^m3 class hydraulic excavator during travel is reduced. The value was reduced by 14 dB, and the maximum value of the vibration level during running of the 4-ton class vibration roller was reduced by 20 dB.

Next, a preferred embodiment of the vibration reduction method of the present invention will be described. In the present embodiment, first, a construction step of creating a ground on which the vibration reducing material 2 is installed is carried out. In the construction process, the ground on which the vibration reducing material 2 is installed is smoothly molded, or crushed stone or the like is spread and leveled.

After carrying out the construction process, the net-like sheet installation process of installing the net-like sheet 8 on the created ground is carried out. In the mesh sheet installation step, first, the mesh sheet 8 wound in a cylindrical shape and packed is unloaded to the ground near the installation position. Next, the net-like sheet 8 wound in a cylindrical shape is manually unfolded. In this case, it is preferable to fix the mesh sheet 8 to the ground with an anchor or the like as necessary to prevent the mesh sheet 8 from slipping. Further, in order to prevent the mesh sheets 8 from being displaced from each other, the mesh sheets 8 may be fixed to each other by welding, adhesion or the like, if necessary.

After carrying out the net-like sheet installation process, carry out the floor plate installation process of installing the floor plate 6 on the net-like sheet 8 installed on the ground. In the floor plate installation step, for example, a hook (not shown) is provided on the floor plate 6, the floor plate 6 is suspended by a lifting machine such as a crane, and the floor plate 6 is installed on the mesh sheet 8 installed on the ground. In order to prevent the floor plates 6 from slipping each other, it is preferable to fix the floor plates 6 to each other by welding or the like as necessary. As a result, stable running of the heavy machine traveling on the upper part of the floor plate 6 becomes possible. The vibration reducing material 2 can be constructed by these net-like sheet installation steps and floor plate installation steps.

When installing the additional floor plate below the net-like sheet 8, after performing the above-mentioned construction step, the additional floor plate installation process of installing the additional floor plate on the created ground is carried out. In the additional floor plate installation process, a hook is provided on the additional floor plate (the same plate as the floor plate 6 may be used), and the additional floor plate is hung by a lifting machine such as a crane and installed on the ground. In order to prevent the additional floor plates from slipping each other, the additional floor plates may be mutually fixed by welding or the like, if necessary. Then, after carrying out the additional floor board installation step, the net-like sheet installation step and the floor board installation step are carried out in order. As a result, it is possible to construct a vibration reducing material in which the mesh sheet 8 is sandwiched between the floor plate 6 and the additional floor plate. With the vibration reducing material 2 constructed by such a method, when a heavy machine 4 such as a hydraulic excavator runs on the upper surface of the vibration reducing material 2, vibration can be effectively reduced as described in the first embodiment. , Stable running is ensured.

2: Vibration reducing material 4: Heavy equipment 6: Floor plate 8: Net-like sheet 10: Upper bar 12:

Lower bar

10a, 10b, 10c, 10d, 10e:

Upper contact part

12a, 12b, 12c, 12d, 12e: Lower contact part 14: Inclined part on one side 16: Inclined part on the other side

Claims

It is a vibration reducing material for reducing vibration when heavy machinery runs.
A floor plate on which a heavy machine runs on the upper surface and a synthetic resin net-like sheet arranged below the floor plate are provided.
The mesh sheet has a plurality of upper contact portions that come into contact with the lower surface of the floor plate, and a plurality of lower contact portions that come into contact with the surface on which the mesh sheet is installed.
A vibration reducing material in which the lower contact portion does not exist directly under at least a part of the plurality of upper contact portions in a state where the net-like sheet is not deformed.
The vibration reducing material according to claim 1, wherein the mesh sheet includes a plurality of upper bars and a plurality of lower bars located below the plurality of upper bars.
The vibration according to claim 2, wherein the upper muscle and the lower muscle are formed in a sinusoidal shape extending in a predetermined direction in different phases, and each of the upper muscles is connected to three or more of the lower muscles. Reduction material.
The vibration reducing material according to any one of claims 1 to 3, wherein the mesh sheet has an inclined portion inclined from the upper contact portion toward the lower contact portion.
The vibration reducing material according to any one of claims 1 to 4, wherein the mesh sheet is made of an elastomer.
The vibration reducing material according to any one of claims 1 to 5, wherein an additional floor plate is arranged below the mesh sheet.
It is a vibration reduction method for reducing vibration when heavy machinery travels.
It includes a step of installing a floor plate on which a heavy machine runs on the upper surface and a process of installing a mesh sheet made of synthetic resin arranged below the floor plate.
The mesh sheet has a plurality of upper contact portions that come into contact with the lower surface of the floor plate, and a plurality of lower contact portions that come into contact with the surface on which the mesh sheet is installed.
A vibration reduction method in which the lower contact portion does not exist directly under at least a part of the plurality of upper contact portions in a state where the net-like sheet is not deformed.