JP6253926B2 - Vibration reduction method in ground environment - Google Patents

Description

  The present invention relates to a vibration reducing method in a ground environment.

  Conventionally, vibrations of heavy construction equipment and the like accompanying building construction propagate to surrounding buildings and cause pain for people, and complaints concerning construction construction vibrations are constant. Therefore, as a method for reducing ground vibration, for example, as Conventional Example 1, as shown in FIG. 8, a method of forming a vibration isolation wall between a vibration source and a receiving building such as a house is known. This is because, as in the construction method of the ground vibration propagation suppressing structure described in Patent Document 1, the inside of the groove in which the solidification material is mixed in a predetermined range of the ground between the vibration generation source and the affected facility. A plurality of bag-like bodies supported by a support member are arranged in a row, a fluid is supplied and expanded before the solidified material is cured, and then the solidified material is cured to form a hollow portion. A hollow wall body in which is formed is constructed (see Patent Document 1).

  Further, as conventional example 2, there is known a method for reducing vibration by reducing the ground response by increasing the rigidity of the ground directly under the vibration source by, for example, a method of replacing the cement with a mixed improvement or a high-strength sandbag. ing.

JP 2009-121085 A

  However, in the conventional vibration reduction method, in the conventional example 1, the wraparound from the lower part of the wall is large, and large vibration reduction cannot be expected for the construction scale. Furthermore, there is a problem that the cost associated with construction is large in both cost and construction period.

  Moreover, in the prior art 2, when it implements in a wide range, there exists a subject that a construction plan will be restrict | limited if the cost increases more than a vibration-proof wall and conversely narrowing the range of ground improvement. The vibration reducing method in the ground environment according to the present invention is proposed in order to solve such a problem.

The gist for solving the above-mentioned problems of the vibration reduction method in the ground environment according to the present invention is to provide a weight between the ground between the vibration source and the object to be received by using the ground as a ground spring. The weight is placed directly on the surface of the ground so that the vibration reduction effect increases as the frequency increases, and the phase of the wave of the vibration source and the wave of the weight is opposite to the vibration source with respect to the weight. The object to be received is placed behind the weight, which is an inner range of a comprehensive line that connects points where the peaks and valleys of the waves cancel each other due to the interference of the two waves that are shifted .

The weight is sandbag or embankment.

  According to the vibration reducing method in the ground environment of the present invention, since the weight as the vibration isolation element is merely placed on the ground, it does not take time for excavation of the ground or processing of the remaining soil, and the weight is removed. However, it can be constructed at a very low cost without much trouble, and has an excellent effect that it can dramatically reduce the construction period and implement vibration countermeasures.

  By making the weight a sandbag, its manufacture is easy, and it is easy to obtain, thereby reducing the cost.

It is explanatory drawing which shows schematic structure of the vibration reduction method in the ground environment which concerns on this invention. In the vibration reduction method in the ground environment of this invention, it is sectional drawing of the state which mounted the weight 1 on the surface of the ground. It is sectional drawing (A) in the state which mounts the same weight 1 on the weight receiving member 2 with a pile, and the top view (B) which shows the inside of the said weight receiving member 2. Sectional view (A) of a state in which the natural period adjusting rubber 5 and the weight receiver upper member 6 are installed on the weight receiving member 2 and the weight 1 is placed thereon, and the natural period adjusting rubber 5 It is sectional drawing (B) at the time of setting it as the force-applying apparatus 7 instead of. It is explanatory drawing which shows the propagation state of a vibration by planar view of the vibration reduction method in the ground environment which concerns on this invention. It is a perspective view which shows three-dimensionally the propagation state by which the vibration by the weight 1 is synthesize | combined with the vibration of the vibration source 10 in the ground surface by the vibration reduction method in the ground environment which concerns on the same invention. In the vibration reduction method in the ground environment which concerns on this invention, it is a characteristic curve figure which shows the difference in the acceleration amplitude ratio by the piled-up stage number of a sandbag. It is explanatory drawing which shows schematic structure of the vibration reduction method in the ground environment which concerns on a prior art example.

  As shown in FIG. 1, the vibration reducing method in the ground environment according to the present invention places a weight 1 as a vibration isolation element on a ground 13 between a vibration source 10 and a receiving object 11 such as a house. Then, the vibration receiving object 11 enters the shade of the weight 1 to reduce vibration.

  Here, the shade 8 of the weight 1, as shown in FIG. 5, is a comprehensive line that connects the points where two waves shifted in phase interfere with each other on the opposite side of the vibration source 10 with respect to the weight 1. This is the inner range. Therefore, the weight 1 is placed on a straight line connecting the vibration source 10 and the vibration receiving object 11.

  As shown in FIG. 1, the vibration reducing method in the ground environment according to the present invention receives vibration on the ground between the vibration source and the receiving object without any improvement or modification to the ground 13. By placing the weight 1 as an element, the vibration receiving object 11 enters the shade of the weight 1 and as a result, vibration is reduced.

  The weight 1 is a sandbag (for example, about 20 kg per bag) in which soil is packed in a hemp bag or a plastic bag. The weight 1 is placed on the surface of the ground 13 between the vibration source 10 and the vibration receiving object 11 as shown in FIG. In addition, it is sufficient if the weight 1 is suitable for cost reduction and construction period shortening, for example, embankment.

For this purpose, for example, the first stage sandbag is placed in a range of about 1 m × 1 m, and it is stacked from four to five stages. The size of the weight 1 and the load amount (weight mass M) depend on the condition of the ground spring (K) of the ground 13 and the magnitude of vibration generated at the vibration source 10 (angular frequency: ω). It is determined appropriately with reference to α = Mω ² / (K + Mω ² ).

  In the state shown in FIG. 1, the state of vibration reduction by the vibration reducing method in the ground environment according to the present invention is as follows. As shown in FIG. Locations where the peaks or troughs of the vibration increase due to the vibration peaks (solid line) and troughs (broken lines) caused by the weight 1 that vibrates due to the source vibration, and where the peaks and troughs cancel each other. (Location shown by x in the figure) appears, and shade 8 is formed.

  In addition, as shown in FIG. 6, the weight 1 creates a shadow 8 of the weight 1 due to the interference of two waves, and the vibration receiving object 11 exists within the range of the shadow 8. It is. Thus, in the vibration receiving object 11, as shown in FIG. 7, by providing the weight 1, the acceleration / amplitude ratio of vibration is reduced to about 80% to 50%, and the effect is reduced as more sandbags are stacked. Is getting bigger.

  Regarding the weight 1, as another embodiment, as shown in FIGS. 3A and 3B, the weight 1 is placed on a weight receiving member 2 with a pile 4 that penetrates into the ground 13. The weight receiving member 2 is a hollow rectangular box made of steel, for example. The pile 4 is joined to the weight receiving member 2 with a bolt 3. And the pile 4 is with the blade | wing 4a penetrated in the ground 13 by rotating in one direction.

  By doing in this way, the vibration from the vibration source 10 propagates well to the weight 1, and the vibration of the weight 1 also propagates well to the ground 13. Moreover, since the weight 1 is mounted on the weight receiving member 2, handling becomes easy.

Furthermore, as another embodiment, as shown in FIG. 4A, a natural period adjusting rubber 5 and a weight receiver upper member 6 made of a steel plate or the like are interposed between the weight 1 and the weight receiver member 2. Is provided. Thereby, the natural period of the weight 1 can be appropriately adjusted. This is effective when the vibration due to the weight 1 is to be adjusted .

  As shown in FIG. 4 (B), instead of the natural period adjusting rubber 5, a force device 7 and a weight receiving upper member 6 are provided between a weight 1 and a weight receiving member 2, and the weight receiver The member 2 is provided with a force control device and a power device for the force device 7 installed therein.

  With such a configuration, the vibration due to the weight 1 can be vibrated, and the size and shape of the shade 8 due to the weight 1 can be changed.

  The vibration reduction method in the ground environment according to the present invention is widely applied without limitation as a method for reducing the vibration of the vibration source, especially for ground construction such as excavation in the city and vibration of heavy equipment movement. .

1 weight,
2 Weight receiving member,
3 volts,
4 steel pipe piles, 4a feathers,
5 Natural period adjustment rubber,
6 Weight receiving upper member,
7 force device,
8 Yin,
10 Vibration source,
11 Target object,
12 Damping wall,
13 Ground.

Claims (2)

A weight is directly placed on the ground surface between the vibration source and the receiving object so that the effect of reducing vibration increases as the weight of the ground increases with the ground as a ground spring. On the opposite side of the vibration source, in the inner range of the inclusion line connecting the points where the peaks and troughs of the waves cancel each other due to the interference of two waves whose phases of the vibration source wave and the weight wave are shifted Allowing the object to be received to enter behind the weight ,
A vibration reduction method in a ground environment characterized by The weight is sandbag or embankment,
The method for reducing vibration in the ground environment according to claim 1, wherein:

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