JP2003090386A - Vibrationproof engineering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a more practical and excellent vibrationproof engineering method capable of unconventionally providing a favorable vibrationproof effect and also capable of contributing to the reduction of construction costs. SOLUTION: At least one layer of waste tires is buried in a horizontal and/or vertical arrangement underground right below or in the circumference of a structure under the application of the vibrationproof engineering method to prevent and reduce vibration to propagate to a periphery of the structure of generating or receiving vibration. It is preferable to fill at least one kind as a filling material selected from site sediment, fluidized treated soil and urethane foam into the waste tires. Additionally, it is preferable to arrange the waste tires in the horizontal state and to connect the adjoining tires to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration method, and more specifically, it suppresses the propagation of vibrations in the ground near a vibration source such as a road or railway structure to thereby prevent the surrounding buildings and ground surfaces from being vibrated. Vibration-proof construction method for preventing or reducing the vibration of the.

[0002]

2. Description of the Related Art In recent years, vibration disturbances frequently occur around roads, railway structures and the like due to traffic vibrations and mechanical vibrations. In particular, in the vicinity of roads and railroad tracks with heavy traffic, the adverse effects of such vibrations on surrounding houses and residents are enormous.Therefore, there is a strong demand for measures to more effectively and efficiently suppress vibrations. Has been.

As a conventionally known method for suppressing vibration, for example, a vibration-proof groove construction method in which a groove is provided in the ground of a vibration propagation path, or a method of filling the groove with a specific material to form an underground wall There is an anti-vibration underground wall construction method to form. These construction methods directly isolate the vibration propagating in the ground due to the existence of the trench or the subterranean trench, respectively, to obtain the vibration isolation effect.However, in the former case, it is practically impossible to keep the trench as it is. Since it is possible to do so, it is necessary to perform auxiliary work for installing soil retaining members and supporting members, which leads to an increase in cost, and there is a drawback that the vibration isolation effect is reduced by such auxiliary work. In addition, the latter method merely replaces the groove with an underground wall of a certain material in order to eliminate the need for auxiliary work in the former, and generally does not provide the same vibration isolation effect as the former method. It was

On the other hand, the present inventors have previously proposed a vibration damping method (flat plate block (WIB) method) by burying a flat plate block (Patent No. 285018).
No. 7). This technique is characterized by burying a flat plate block having a specific size and rigidity at a specific depth below or around a foundation structure that emits or receives vibration. Therefore, by finding that the flat plate block has a higher damping effect than the vertical underground wall that has been conventionally used, the theory of wave propagation in the ground established by the inventors (wave propagation・ It was realized based on the non-propagation phenomenon identification method.

[0005]

However, although this method is an effective method for suppressing vibration, it cannot be said that it has sufficiently satisfied the required level of vibration-proofing effect that has been increasing in recent years. Also, there was a drawback that the construction cost including material cost would be high.

[0006] Therefore, an object of the present invention is to provide a more practical and excellent vibration-proofing method which can obtain a better vibration-proofing effect than ever before and can also contribute to cost reduction. To do.

[0007]

Means for Solving the Problems Based on the wave propagation theory in the ground described in the above-mentioned Japanese Patent No. 2850187, the inventors of the present invention have earnestly studied to realize further improvement of the vibration isolation effect, The present inventors have completed the present invention by finding that a structure utilizing the mechanical properties of a tire can provide an excellent vibration damping effect that cannot be obtained by conventional methods. That is, the vibration-proof construction method of the present invention is as follows.

(1) In a vibration-proof construction method for preventing and reducing vibrations that propagate or propagate around a structure that emits or receives vibrations, waste tires are provided below or around the structure, in the ground. It is a vibration-proof construction method characterized by burying at least one layer in a horizontally and / or vertically arranged state.

(2) The vibration isolation method of the above (1), in which the waste tire is filled with at least one selected from local earth and sand, fluidized soil and urethane foam as a filling material.

(3) In the vibration isolation method of the above (1) or (2), the waste tires are arranged horizontally and the adjacent waste tires are connected to each other.

(4) The vibration isolation method of the above (1) or (2), in which the waste tires are arranged horizontally so as to form a honeycomb shape.

(5) In the vibration isolation method of the above (1) or (2), the waste tires are arranged so that their tire central axes coincide with each other in a vertically installed state.

(6) The vibration isolation method of the above (1) or (2), wherein a hard layer is formed on the lower surface of the buried waste tire.

According to the present invention described above, a wave barrier construction technique based on the aforementioned wave propagation theory in the ground (Patent No. 285) is used.
No. 0187) and new knowledge about the mechanical characteristics of a medium-sized tire, it is possible to maximize the characteristics of the tire to greatly improve the damping effect of vibration propagation in the ground, The recycling effect of waste tires can greatly contribute to the reduction of construction cost. As a result, it becomes possible to provide a vibration-proof technology having high practical value.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. In the present invention, a structure using the filled tire according to the present invention, which will be described in detail below, is embedded in the ground below or around the structure that emits or receives vibration.

In the present invention, as the filling material for the waste tire, local earth and sand, fluidized soil, urethane foam, etc. can be used, but at least urethane is used as the filling material for the hollow portion (donut portion) of the waste tire. Foam is preferred. In this case, by adjusting the hardness by blending the urethane foam raw material, it is possible to easily change the shear rate of the padded tire against vibration input. In addition, when using local earth and sand or fluidized soil as the filling material, voids are likely to occur in the filling of the tire hollow part, and strength will decrease if there are voids, so be careful when filling. It is necessary to pay, but in the case of urethane foam, it is easy to perform dense packing without producing voids even when the hollow portion of the tire is bent, and this is also preferable. Furthermore, since urethane foam is lighter than other materials, the inner tire itself can be made extremely lightweight, which makes it suitable not only for carrying, but also for soft ground, and the buoyancy effect of groundwater. And can be a lightweight underground structure.

As schematically shown in FIG. 1B, by embedding the filled tire 1 filled with the filling material 3 in the hollow portion of the waste tire 2 in the ground, an input vibration damping effect can be obtained. The reason for this is that the propagating periodic input undergoes a modulation effect due to the elastic deformation of the tire material itself, and the input energy disappears. For example, when the filled tire 1 is placed vertically in the ground as shown in FIG. 1A, when vibration propagating from the ground surface is input into the filled tire, the tire is elastically deformed and the input vibration is generated. Is modulated in a manner corresponding to twice the diameter of the tire, and as a result, a wave scattering phenomenon occurs in which the input vibration is converted into the overring vibration along the tire axle. That is, the vertical input stress is converted into hoop stress propagating in the tire circumferential direction,
At the wavelength corresponding to the filling material, the input vibration energy is lost due to the interference action, and the propagating vibration is greatly attenuated. In addition, although the vibration damping mechanism in the case of vertical installation is shown in FIG. 1 (A), the theory is the same in the case of horizontal installation, and the same is true for vibration propagating horizontally to the ground surface. I can say that.

By changing the filling material 3 to be filled in the waste tire, the propagation wavelength of the vibration in the filling tire can be adjusted appropriately, so that, for example, the target structure, for example, the traffic load on the road The damping effect can be enhanced by setting the wavelength corresponding to the periodicity of the input vibration in correspondence with the periodic band.

When urethane foam is used as the filling material 3, the compounding raw material, the filling method for the waste tire 2 and the like are not particularly limited. For example, as the compounding raw material, a prepolymer containing TDI and a polyol as the main ingredients is used. It is generally possible to use a polymer and use MOCA (3,3′-dichloro-4,4′-diaminodiphenylmethane) and a polyol together as a crosslinking agent for the curing agent, but in order to improve the curability. MDI-based prepolymers that are highly reactive to the base compound, and polyamines that are highly reactive to curing agents (diethyltoluenediamine, 3,5-dimethylthiotoluenediamine, 3,3'-diethyl-4,4'-diaminodiphenylmethane, etc.) ) Can also be used. Further, as a filling method, for example, an on-site foaming urethane spray machine can be used.

Fluidized soil is used for both the hollow portion (donut portion) 4 of the waste tire 2 and the wheel arrangement area (central portion) 5, or the filling material 3 for the hollow portion of the waste tire 2 is urethane foam. When fluidized soil is used for the wheel placement region 5, industrial fluid may be mixed with general-purpose fluidized soil as such fluidized soil. Can also contribute to. However, in this case, it is necessary to consider the ground pollution, and it is important to prevent the surrounding ground from being adversely affected.

In the construction method of the present invention, since the waste tire which is originally a waste is used as the main material, the material cost can be greatly reduced, and in addition to the improvement of the vibration isolation effect, the low cost In terms of, it is also superior to the conventional method.

There is no particular limitation on the arrangement form of the inside tire 1, and it can be appropriately determined according to the symmetrical structure. The direction in which the tire is embedded may be horizontal or vertical, or both may be used in combination. Preferably, in the ground below the target structure, at a suitable depth based on the above publication, a hard layer is formed over a suitable area based on the above publication, and the waste tires 1 are disposed on the hard layer at appropriate intervals. Place and bury. The thickness and hardness of the hard layer may be appropriately selected according to the hardness of the ground.

A preferred example of the arrangement of the waste tire 1 on the hard layer is shown in FIGS. 2 (a) and 2 (b). 2 (a) and 2 (b) are both examples in which the solid tire 1 is arranged on the hard layer without a gap, and such a waste tire layer may be formed by one layer, It is preferable to form two or more waste tire layers in the depth direction while shifting the positions to keep the overall strength constant. 3A and 3B are cross-sectional views of an example of a buried structure of a waste tire when the waste tire layers are laminated in two or three layers. In the figure, 6 is a hard layer formed in the ground, and 7 is the ground surface. In addition, when forming such a waste tire layer, a sandbag or the like can be filled with local earth and sand or fluidized soil in the wheel arrangement region of the waste tire and the gap between the tires.

As for the arrangement form, as shown in FIG. 4 (a), a fixed number of the filled tires 1 are arranged in a horizontal position so as to draw a regular hexagon, as shown in FIG. 4 (b). As described above, it is also preferable to adopt a honeycomb-shaped arrangement as a whole. Also in this case, the waste tire layer can be formed by one layer or two or more layers in the depth direction as appropriate.

Further, in the construction method of the present invention, the input energy is absorbed due to the movement of the waste tire due to the ground deformation and the friction generated between the waste tire and the surrounding ground to reduce the vibration damping effect in the ground. It can be improved. For example, as shown in FIGS. 5 and 6, a solid tire 1
In the case of a preferred arrangement mode in which one or two or more waste tire layers are formed by arranging the tires vertically on the hard layer 6 so that the tire central axes coincide with each other, the input stress from the ground surface On the other hand, the waste tire layer sandwiched between the upper ground 8 and the hard layer 6 has a sandwich effect. That is, since the waste tire layer has a high shear rate and a small density, the input stress in the vertical direction acts on the waste tire layer in the direction of causing the shear deformation in the horizontal direction between the upper and lower base plates. Thus, in addition to the above-described vibration damping effect in each of the waste tires, the vibration can be damped by the horizontal movement of the filled tire 1 and the friction with the surrounding ground.

Further, in the case of this arrangement mode, the communicating through holes 1 formed in the wheel arrangement area of the filled tire 1
By filling the fluidized soil 11 in 0, the fluidized soil 11 exerts a function of connecting the packed tires 1 juxtaposed with each other, and even if no connecting means is provided between the tires. The continuous state can be stably maintained. 2 and 3
In the case of the arrangement configuration in which the tires are adjacent to each other in the laterally placed state as illustrated in 4 and 4, for example, an appropriate connecting member such as vinyl tape is used to join the adjacent portions between the tires. The tires should be connected so that each tire does not move independently.

The embedding depth and the embedding area area of the inside tire 1 or the waste tire layer can be appropriately determined based on the wave propagation theory in the ground described in the above publication. In particular, the area of the buried region of the filled tire 1 or the area of at least one of the waste tire layers as illustrated may be substantially equal to or larger than the bottom surface area of the target structure. It is suitable. For example, when the waste tire layer is formed in the cross-sectional arrangement form as shown in FIGS. 3A and 3B, the maximum width W of the waste tire layer shown in FIG.
It is preferable that the width is equal to or larger than the width of the target structure, for example, a road or a track.

[0028]

EXAMPLES The present invention will be described below with reference to examples. First, the hollow portion (donut portion) and the central portion (wheel arrangement region) of a waste tire having an average size of 60 cm in outer diameter and 20 cm in width are filled with fluidized soil, and a predetermined number of medium-sized tires (see FIG. 7). -10 out of 10 is called "fluidized soil WIB")
Was produced. Further, a similar number of waste tires were similarly filled with the soil of the original ground to prepare a predetermined number of medium-sized tires (referred to as “waste tire WIB” in FIGS. 7 to 10). Note that FIG.
Among 10 to 10, before the ground improvement is referred to as "original condition" or "before WIB construction". The composition of the fluidized soil used is as shown in Table 1 below.

[0029]

[Table 1]

At the experimental site, a surface layer having an N value of 10 or less was present below the ground surface, and a gravel layer having an N value of 50 or more was present near GL 11.5 m. Here, the depth from the ground surface is 0.5
A hard layer is formed at the position of m, and the buried region area of the uppermost layer is abolished so as to have a width of 5 m and a length of 10 m in the arrangement form shown in FIG. 2 (a) and the laminated form shown in FIG. 3 (b). Three tire layers were laminated and embedded. Each tire was restrained with vinyl tape to prevent the individual tires from moving independently.

By using the center of the waste tire burying region as a vibration point (zero point), a guide hammer having a weight (about 70 kg) attached to the tip of an arm (about 70 cm) of a hinge structure as a vibration source. Impact loading and repeated vibration loading by traveling of a dump truck and a caterpillar vehicle are applied, and every 30 m at intervals of 5 m in the width direction.
The vibration of the surrounding ground was measured at 7 points on one measuring line to the point. The effect of damping is shown in FIG. In addition, for measurement,
A servo type speedometer (manufactured by Tokyo Senshin Co., Ltd.) was used. Also,
For comparison, the same measurement was performed on the unimproved ground before burying the waste tires.

The graph of FIG. 7 is drawn with respect to the speed response of the ground. The horizontal axis represents time (sec) and the vertical axis represents speed (cm / cm).
Seconds). Further, FIG. 8 shows the Fourier spectrum of the result shown in FIG. 7, where the horizontal axis represents the frequency (Hz) and the vertical axis represents the Fourier amplitude (cm / sec.sec).

From the above-mentioned measurement results, it can be seen that after the improvement, the vibration suppressing effect of 50% or more is exhibited compared to before the ground improvement. In particular, it shows that the response after ground improvement is highly damped.

Next, FIG. 9 shows the measurement results when the waste tire filling is constructed with the earth and sand of the original ground. From Fig. 9, the frequency of vibration generated from a general traffic vehicle is about 10Hz,
In the construction method of the embodiment, the vibration frequency is 30
It was confirmed to show an effective damping effect of% over the entire distance.

FIG. 10 shows the result of the computer simulation of the measurement result of FIG. 9, and it can be seen from this FIG. 10 that vibration can be greatly reduced by sufficiently hardening the waste tire filling. In particular, by arranging the waste tires vertically, greater rigidity can be expected.

[0036]

As described above, according to the vibration isolating method of the present invention, it is possible to obtain a better vibration isolating effect than ever before, and the use of waste tires as waste reduces the construction cost. It can also contribute to cost reduction.

[Brief description of drawings]

FIG. 1A is an explanatory diagram showing how vibration propagating from the ground surface is input into a buried waste tire. (B) is
It is a sectional view of a waste tire concerning the present invention.

FIG. 2 is a plan view showing a preferred example of an arrangement form of waste tires.

FIG. 3 is a vertical cross-sectional view showing an example of a buried structure of a waste tire.

[Fig. 4] Fig. 4 is a schematic plan view showing a honeycomb-shaped arrangement form of a waste tire.

FIG. 5 is a schematic perspective view showing a preferred example of an arrangement form of a waste tire in a vertically installed state.

6 is an explanatory diagram showing a vibration damping effect in the arrangement form of FIG.

FIG. 7 is a graph showing a comparison of time history responses in measurement results in an example.

FIG. 8 is a graph showing comparison of Fourier spectra in measurement results in the example.

FIG. 9 is a graph showing the distance attenuation of the maximum velocity in the measurement result in the example.

FIG. 10 is a graph showing distance attenuation as an analysis result in an example.

[Explanation of symbols]

1 middle tire 2 scrap tires 3 filling materials 4 hollow part 5 Wheel placement area 6 hard layer 7 Ground surface 8 upper ground 9 Upper ground 10 through holes 11 Fluidized soil

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hirokazu Takemiya             3-1-1 Tsushimachu, Okayama City, Okayama Prefecture Okayama University             Faculty of Environmental Science and Engineering, Department of Environmental Design Engineering F term (reference) 3J048 AA01 AC02 BA24 BD06 DA03                       EA38

Claims (6)

[Claims] 1. A vibration-proof construction method for preventing and reducing vibration propagating to the periphery of a structure that emits or receives vibration, wherein a waste tire is laterally disposed below or around the structure. An anti-vibration method characterized by burying at least one layer in a standing and / or vertical arrangement state. 2. The vibration isolating method according to claim 1, wherein the waste tire is filled with at least one selected from local earth and sand, fluidized soil and urethane foam as a filling material. 3. The waste tires are arranged sideways,
The vibration-proof construction method according to claim 1 or 2, wherein adjacent waste tires are connected to each other. 4. The anti-vibration method according to claim 1, wherein the waste tires are arranged in a horizontal position so as to form a honeycomb shape. 5. The anti-vibration method according to claim 1, wherein the waste tires are arranged vertically so that the tire central axes thereof coincide with each other. 6. The vibration isolation method according to claim 1, wherein a hard layer is formed on the lower surface of the buried waste tire.