JP2009002073A - Vibration reducing method and vibration reducing structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration reducing method which eliminates the risk of the collapse of a porous wall, exerts a vibration reducing effect without requiring water cutoff control, is excellent in workability and cost efficiency owing to the implementation of the method by a rational and simple structure, and is sufficiently endurable for a long-term use, and to provide a vibration reducing structure. <P>SOLUTION: A vibration-proof groove 3 is formed by being filled with a porous wall stabilizing liquid 4 for preventing the collapse of the porous wall 3a, and a pipe 7 having ejection holes 6 for feeding bubbles 5 into the porous wall stabilizing liquid 4 is set. Thus, by adjusting the number and sizes of the bubbles 5 ejected from the pipe 7 into the porous wall stabilizing liquid 4, vibration propagation is reduced. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vibration reduction method and vibration reduction that can be suitably applied to the surrounding ground of a structure in which ground vibration (environmental vibration) is a problem with a vehicle or a railway traveling in the vicinity or a factory or a live house as a vibration source. A vibration reduction method and vibration that belong to the technical field of structure, and more specifically, provide vibration isolation grooves in the surrounding ground of the structure to reduce vibration propagation to the structure or vibration propagation from the structure that is the vibration source. It relates to a reduction structure.

  As a method for isolating vibration in the propagation path of vibration, an invention (air groove construction method) in which a ground is provided in a surrounding ground of a structure to insulate the ground is already known (see, for example, Patent Document 1). It has been confirmed theoretically and experimentally that the present invention has a great effect of vibration isolation. However, it is difficult to stably hold the air groove for a long period of time due to the collapse of the hole wall due to the earthquake or the flow of groundwater, and if water such as ground water or rainwater enters the air groove, it will vibrate due to incompressible water. Is not practical and few examples are actually implemented.

  Therefore, in order to stably hold the air groove for a long period of time, an invention is also disclosed in which the wall body having higher rigidity than the ground, a steel support frame, or the like is implemented with the air groove attached to the side surface of the hole wall. (For example, see Patent Document 2). However, the vibration isolation effect is lower than that of a complete ditch, which may amplify the vibration depending on the target ground and vibration characteristics. If water such as groundwater or rainwater enters the ditch, it will not be There is a problem that water stoppage management is necessary because vibration is propagated by compressible water.

  In short, although the invention that forms an air groove in the ground around the structure to block vibration is theoretically effective, the problem is that vibration is propagated by incompressible water when water enters the air groove. Was still not practical and not practical.

Therefore, various inventions that improve the air groove construction method to achieve a vibration reduction effect have been disclosed (see, for example, Patent Documents 3 and 4).
As shown in FIG. 1, the invention according to Patent Document 3 is inserted into a groove 2 excavated in the ground, a plate-shaped vibration absorbing material 1 standing in the groove 2, and the vibration absorbing material 1 in the groove 2. By constructing a vibration reducing structure with the backfill material 3, the problem of water intrusion into the groove 2 is solved and a vibration reducing effect is achieved.
As shown in FIG. 1, the invention according to Patent Document 4 includes a solidified wall 3 built in the ground, and a vibration reduction layer 4 that is softer than the solidified wall disposed in parallel with the solidified wall at the center of the solidified wall. By configuring the ground vibration reduction wall 1 with this, the vibration reduction effect is achieved.

JP-A-6-240780 Japanese Patent Laid-Open No. 9-291557 JP-A-4-312607 JP 2001-241061 A

  The vibration reduction structure according to Patent Document 3 is implemented by a structure in which elastic vibration absorbing sheet 11 and a large number of press-fitted air bags 12 are laminated as vibration absorbing material 1, and there is a problem that construction is complicated and cost increases. is there. The high-damping material used for the vibration-absorbing sheet 11 is fragile and difficult to construct with a predetermined shape and quality, and is not suitable for long-term use. In addition, it is necessary to select (design) the vibration-proof material and the structure appropriately according to the target ground and the nature of the vibration, which requires a high level of design power and has a very troublesome problem. Furthermore, there is a problem that it cannot be handled at all when the vibration level of the vibration source is increased by changing the surrounding environment after construction, or when the required level of quietness is improved by changing the environmental standard.

  Although it is recognized that the vibration reduction structure according to Patent Document 4 is devised in the installation method of the vibration reduction layer 4, the process of creating the vibration reduction layer 4 is troublesome, and the problem of increasing the cost is still not solved. . In addition, the problem that it cannot be dealt with at all when the vibration level of the vibration source has increased due to changes in the surrounding environment after construction, or when the required level of quietness has improved due to changes in environmental standards has not been solved. .

The object of the present invention is that there is no possibility of collapse of the hole wall, it is possible to exhibit a vibration reduction effect without the need for water stop management, and since it can be carried out with a rational and simple structure, it is excellent in workability and economy, and for a long time. Another object of the present invention is to provide a vibration reduction method and a vibration reduction structure that can sufficiently withstand the use of the above.
The object of the present invention is to provide a vibration reduction method and vibration excellent in flexibility, capable of responding to changes in the surrounding environment and environmental standards after construction, and capable of reliably exhibiting a desired vibration reduction effect. It is to provide a reduction structure.

  As a means for solving the above-mentioned background art, the vibration reduction method according to claim 1 is a vibration reduction method for reducing vibration propagation by providing a vibration isolation groove in the ground, wherein the vibration isolation method The groove is constructed by filling with a hole wall stabilizing liquid that prevents the hole wall from collapsing, and a pipe having an ejection hole for supplying bubbles into the hole wall stabilizing liquid is installed, and the hole wall stabilizing liquid is provided from the pipe. It is characterized in that vibration propagation is reduced by adjusting the number and size of bubbles blown out.

  A vibration reduction structure according to a second aspect of the invention is a vibration reduction structure in which a vibration isolation groove is provided in the ground to reduce vibration propagation, and the vibration prevention groove has a hole for preventing the collapse of a hole wall. A control system that is filled with the wall stabilizing liquid to the required height and that has a discharge hole for supplying bubbles to the wall stabilizing liquid, and that can adjust the pressure of the bubbles. It is characterized by being communicated with.

  According to a third aspect of the present invention, in the vibration reducing structure according to the second aspect of the present invention, the pore wall stabilizing liquid has a specific gravity such as fresh water, muddy water in which fine ground soil is dissolved, or a stabilizing liquid. It is characterized by being a high liquid.

  According to a fourth aspect of the present invention, there is provided the vibration reducing structure according to the second or third aspect, further comprising a stabilizing liquid supply system that maintains a constant amount of the hole wall stabilizing liquid filled in the vibration isolating groove. It is characterized by.

According to the vibration reduction method according to the invention described in claim 1 and the vibration reduction structure according to the invention described in claims 2 to 4, the following effects can be obtained.
1) Since the vibration-proof groove can be filled with a hole wall stabilizing liquid that prevents the hole wall from collapsing and the vibration reducing effect can be achieved, there is no possibility of hole wall collapse, and there is no need for water stop management. It can sufficiently exhibit the anti-vibration effect even in the ground with high groundwater level that cannot be handled by the so-called air ditch method.
2) Since the hole wall stabilizer used in the continuous wall construction method can be used as it is and the air bubbles are supplied into the hole wall stabilizer, it can be carried out with a rational and simple structure, so the cost of materials, etc. can be reduced. Construction is also easy. Since it can implement without providing a wall material in the ground, it does not take time and can suppress generation | occurrence | production of industrial waste in connection with this.
3) Since the vibration reduction effect can be adjusted appropriately afterwards to changes in the surrounding environment and environmental standards after construction, it has excellent flexibility.
4) Maintenance of the hole wall stabilizing liquid and piping is easy and permanent use is possible.

Hereinafter, embodiments of a vibration reducing method and a vibration reducing structure of the present invention will be described with reference to the drawings.
As schematically shown in FIGS. 1A and 1B, the present invention is a vibration reduction method for reducing vibration propagation to a structure 1 by providing a vibration isolation groove 3 in the ground 2 around the structure 1. The anti-vibration groove 3 is constructed by filling with a hole wall stabilizing liquid 4 for preventing the hole wall 3a from collapsing, and a pipe 7 having an ejection hole 6 for supplying bubbles 5 into the hole wall stabilizing liquid 4 is installed. The vibration propagation to the structure 1 is reduced by adjusting the number and size of the bubbles 5 ejected from the pipe 7 into the hole wall stabilizing liquid 4 (the invention according to claim 1). ).
In the vibration reducing structure constructed by the vibration reducing method, the anti-vibration groove 3 is filled with a hole wall stabilizing liquid 4 to prevent the hole wall 3a from collapsing to a required height, and the hole wall stabilizing liquid 4 is provided with a pipe 7 provided with an ejection hole 6 for supplying bubbles 5, and the pipe 7 communicates with a control system 8 capable of adjusting the ejection pressure of the bubbles 5 (the invention according to claim 2). ).

  Incidentally, the structure 1 is a technical idea including the whole building, and in this embodiment, the building 1 is a building requiring quietness such as a residence, a music hall, a precision machine factory, and the like. However, the structure 1 is not limited to a building where quietness is required, and conversely, when the structure 1 is implemented as a vibration source such as a live house, the structure 1 can be similarly implemented.

The anti-vibration groove 3 is constructed by a known continuous wall construction method (also referred to as an underground continuous wall construction method) for the ground 2 while injecting the hole wall stabilizing liquid 4 while preventing the hole wall 3a from collapsing. The hole wall stabilizing liquid 4 maintains the filled state at a necessary height even after the vibration isolating groove 3 is constructed. By carrying out like this, collapse of the said hole wall 3a can be prevented permanently. Therefore, there is no need to attach a highly rigid wall body or steel support frame to the hole wall 3a.
Incidentally, the anti-vibration groove 3 is provided in a rectangular shape so as to surround the structure 1 when viewed in the plane direction as shown in FIG. 2 in the present embodiment, but is not limited thereto. The design can be changed as appropriate according to the location conditions of the vibration source and the structure 1. For example, the anti-vibration groove 3 can be constructed linearly so as to cut off between the structure 1 and a vibration source such as a vehicle or a railway. The size of the anti-vibration groove 3 such as the width is appropriately changed according to the location conditions of the structure 1 to be implemented and the surrounding environment. However, it is preferable that the size is as small as possible because it is economical.

  In the present embodiment, the hole wall stabilizing liquid 4 uses the stabilizing liquid 4 suitable for both the continuous wall construction method and the hole wall 3a, but the present invention is not limited to this, and the fine grain size of the ground having a high specific gravity dissolves. Even muddy water can be suitably implemented. In addition, when it implements in the ground 2 in which a waterless digging and a fresh water digging are possible, it is applicable also with a fresh water (water). In short, the hole wall stabilizing liquid 4 can be appropriately selected and implemented according to the properties of the ground 2 to be implemented (the invention according to claim 3).

  In the present embodiment, the air pump 8 is applied to the bubble 5 as the control system 8 and is operated to supply the air 5 into the hole wall stabilizing liquid 4. The bubbles 5 supplied into the hole wall stabilizing liquid 4 are not limited to the air 5 and are not particularly limited as long as they are compressible gases.

  In the present embodiment, the pipe 7 connects the pipe 7 a installed in the horizontal direction and the pipe 7 b installed in the vertical direction in an L shape, and the pipe 7 a extends along the bottom wall (bottom surface) portion of the vibration isolating groove 3. Implemented in configuration. One end of the vertical pipe 7b communicates with the air pump 8 provided on the ground. By the way, in the present embodiment, the ejection hole 6 is provided only in the pipe 7a installed in the horizontal direction, and the bubbles 5 are ejected only from the pipe 7a.

  By the way, when the mechanism that can reduce the vibration propagation from the vibration source to the structure 1 when the bubbles 5 are generated in the hole wall stabilizing liquid 4 in the vibration isolating groove 3 is described, 3, the vibration is reflected and refracted at the boundary surface between the hole wall stabilizing liquid 4 and the bubbles 5, and diffused and attenuated, and the effect of insulating with the bubbles 5 contained in the hole wall stabilizing liquid 4 It was thought that vibration propagation from the source to the structure 1 could be reduced. Therefore, the present applicant made a model and conducted an indoor experiment. As a result, the volume of each bubble 5 was reduced and the surface area of the bubble 5 ejected into the pore wall stabilizing liquid 4 was increased. It has been found that the vibration reduction effect increases as the occupied volume of the bubbles 5 ejected into the hole wall stabilizing liquid 4 increases. However, how much vibration reduction effect is suitable in practice depends on the quietness required for the structure 1 to be applied, the size of the vibration source, the form of the vibration isolating groove 3, or the ground properties. Different. Therefore, in actuality, considering the size of the vibration source and the required vibration reduction effect, the shape of the anti-vibration groove 3, the quantity and arrangement of the piping 7, and the performance of the air pump 8, and the performance of the air pump 8 are roughly designed. Since the number and size of the bubbles 5 ejected from the pipe 7 into the hole wall stabilizing liquid 4 are appropriately adjusted so that vibration propagation from the vibration source to the structure 1 can be reduced to a desired value at the site. is there.

Therefore, when the hole wall 3a of the vibration isolating groove 3 is high, the pipe 7 and the air pump 8 can eject the bubbles 5 into the vibration isolating groove 3 (hole wall stabilizing liquid 4) with sufficient balance. In order to be able to do so, the ejection performance and the piping path are appropriately changed in design according to the specific gravity of the hole wall stabilizer 4 used (the stabilizer 4 in this embodiment).
For example, when the pipe 7 becomes too long, the ejection pressure of the ejection hole 6 far from the air pump becomes lower than the ejection pressure of the ejection hole 6 close to the air pump 8, and there are few bubbles 5 and the vibration-proof performance is lowered. . Further, even when the capacity (amount of ejection) of the air pump 8 is small, the volume occupied by the bubbles 5 per height of the hole wall 3a is small and the vibration isolation performance is lowered. Based on such facts, the optimum length of the pipe 7 is determined from the balance between the capacity of the air pump 8 and the required vibration-proof performance. Incidentally, in this embodiment, as shown in FIG. 2, the vibration pump 3 that surrounds the structure 1 has one air pump 8 for the vibration-proof groove 3 corresponding to one side (straight line). In total, four air pumps 8 are used. Each of the air pumps 8 is provided with four sets of pipes 7 in a well-balanced manner, and bubbles are contained in the hole wall stabilizing liquid 4 filled in the vibration-proof grooves 3 formed in a square shape when viewed from the plane. 5 is implemented in a configuration that can be ejected evenly.
Of course, the configuration of the pipe 7 is not limited to this, and in order to further improve the vibration-proof performance, two pipes 7 are arranged in parallel as shown in FIG. You can also.

  Incidentally, the material of the pipe 7 is not particularly limited as long as it can withstand the pressure of the bubbles 5 ejected from the ejection holes 6 such as metal or vinyl chloride. A pressure gauge and a valve can be installed on the pipe 7 as necessary for inspection and maintenance. Further, in order to improve the ejection performance of the individual pipes 7, the number of ejection holes 6 can be increased as shown in FIG. 3A, or as shown in FIG. 3B, A so-called porous stone 9 can be attached and a fine bubble can be ejected.

Therefore, according to the vibration reducing method and the vibration reducing structure having the above-described configuration, the vibration reducing groove 3 can be filled with the hole wall stabilizing liquid 4 for preventing the hole wall 3a from collapsing, so that the vibration reducing effect can be achieved. There is no risk of the wall 3a collapsing, and there is no need for water stoppage management. Moreover, the vibration isolation effect can be sufficiently exerted even on the ground having a high groundwater level that cannot be handled by the so-called air gutter method.
Since it can be implemented with a rational and simple structure that uses the hole wall stabilizer 4 used in the continuous wall construction method as it is and supplies the bubbles 5 into the hole wall stabilizer 4, the cost of materials, etc. is low. The construction is easy. Since it can implement without providing a wall material in the ground, it does not take time and can suppress generation | occurrence | production of industrial waste in connection with this.
Since the vibration reduction effect can be adjusted appropriately afterwards to changes in the surrounding environment and environmental standards after construction, it has excellent flexibility.
Maintenance of the hole wall stabilizing liquid 4 and the piping 5 is easy and can be used permanently.

The embodiments have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments, and design modifications and application variations that are usually made by those skilled in the art are within the scope of the technical idea of the invention. I will add a note to include the range.
For example, in order to enable more permanent implementation, a stabilization liquid supply system (not shown) that maintains a constant amount of the hole wall stabilization liquid 4 filled in the vibration isolation groove 3 may be provided. (Invention of Claim 4).
Further, the upper portion of the vibration isolating groove 3 can be implemented even in an opened state as shown in FIGS. 2B and 4B, but generally, as shown in FIG. It is carried out in a storage (rain ending) shape that secures C. Incidentally, reference numeral 10 denotes concrete, reference numeral 11 denotes a metal steel plate, reference numeral 12 denotes a drainage groove, and reference numeral 13 denotes a drain hole.

A is a perspective sectional view showing an example of a vibration reducing method and a vibration reducing structure according to the present invention, and B is a plan view. It is the top view which showed one Example of the vibration reduction method and vibration reduction structure which concern on this invention. A and B are perspective views showing variations of piping used in the vibration reducing method and the vibration reducing structure according to the present invention, respectively. A is a perspective cross-sectional view showing different embodiments of the vibration reducing method and the vibration reducing structure according to the present invention, and B is an elevational view. A to C are respectively elevation views illustrating the storage above the vibration-proof groove.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Structure 2 Ground 3 Anti-vibration groove 3a Hole wall 4 Hole wall stabilizer (stabilizer)
5 Bubbles 6 Blowout holes 7 Piping 8 Control system (air pump)
9 Porous Stone

Claims (4)

A vibration reduction method for reducing vibration propagation by providing a vibration isolation groove in the ground,
The anti-vibration groove is constructed by filling with a hole wall stabilizing liquid that prevents the hole wall from collapsing, and a pipe provided with an ejection hole for supplying bubbles into the hole wall stabilizing liquid is installed. A vibration reduction method characterized by reducing vibration propagation by adjusting the number and size of bubbles ejected into the wall stabilizing liquid. It is a vibration reduction structure that reduces vibration propagation by providing anti-vibration grooves in the ground,
The anti-vibration groove is filled with a hole wall stabilizing liquid for preventing the collapse of the hole wall to a required height, and a pipe is provided with an ejection hole for supplying bubbles into the hole wall stabilizing liquid. The vibration reducing structure is characterized in that the pipe is communicated with a control system capable of adjusting the bubble ejection pressure.   The vibration reduction structure according to claim 2, wherein the hole wall stabilizing liquid is a high specific gravity liquid such as fresh water, muddy water in which fine ground soil is dissolved, or a stabilizing liquid.   4. The vibration reducing structure according to claim 2, further comprising a stabilizing liquid supply system that maintains a constant amount of hole wall stabilizing liquid filled in the vibration isolating groove.

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