JPH1183666A - Underwater/in-soil vibrating table apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the absorption of vibrations of a vibrating table even when soil is put in a water/soil tank, by mounting an elastically deformable vibration- absorbing seal member forming a space of an adjustable internal pressure in a gap between a fixed part and a vibrating part of the water/soil tank. SOLUTION: A vibration-absorbing seal member 11 comprises a rubber annular tube 11a and a pair of rubber flange parts 11b set at a side face of the annular tube and extending in a diametrical direction. The flange parts 11b are mounted on a bottom wall 12a and a vibrating table 13 of a water/soil tank by bolts and seal materials, whereby the seal member is fitted at a gap between the bottom wall 12a and the vibrating table 13. This underwater/in-soil vibrating table apparatus is constructed with the rubber vibration-absorbing seal member 11 of the adjustable internal pressure fitted at the gap of the bottom wall 12a and the vibrating table 13 of the water/soil tank. Therefore, even if the apparatus receives a pressure of soil in the water/soil tank, the space in the annular tube 11b can be maintained by adjustment of the internal pressure, so that the vibrations of the vibrating table 13 are absorbed through deformation of the annular tube 11a towards the space.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water and soil shaking table apparatus capable of reproducing the behavior of underwater and soil structures during an earthquake.

[0002]

2. Description of the Related Art When a structure such as a breakwater or a quay is constructed underwater, an earthquake-resistant design is more complicated than a land-based structure. This is because it is necessary to take into account the fact that the connection with water is added and the liquefaction phenomenon of the ground.

In Japan, an underwater shaking table apparatus capable of reproducing the behavior of such an underwater structure during an earthquake has already been put to practical use.

FIGS. 9 and 10 schematically show an example of the apparatus. FIG. 9 is a longitudinal sectional view, and FIG. 10 is a plan view.

This device comprises a horizontal shaker 1 and a vertical shaker 2
The vibration table 3 is set on the bottom wall 4a of the water tank 4 and the gap between the bottom wall 4a of the water tank 4 and the vibration table 3 is sealed and the vibration of the vibration table 3 is absorbed. The structure has a vibration absorbing seal member 5 made of an elastic material.

[0006] The water tank 4 is provided on a base 6, and the shaking table 3 is mounted on the base 6 via the vibrators 1 and 2, and the base 6 is set on the base 7. The diameter of the shaking table 3 is 5.6
5 m, and the water tank 4 is a 15 m square tank having a depth of 2 m. As shown in FIG. 11, the vibration-absorbing seal member 5 has a hat-shaped cross section, and is attached to the bottom wall 4a of the water tank 4 and the vibration table 3 with the concave portion facing upward at the flange portion 5a.

The specifications of the apparatus are suitable for an underwater vibration test of the structure 8 installed on the shaking table 3.
That is, it is possible to input an arbitrary random wave as a seismic motion, and it is possible to reproduce a previously observed waveform on the shaking table 3.

Since the conventional underwater shaking table apparatus has such a structure, if the structure 8 is installed on the shaking table 3, water is filled in the water tank 4, and the shaking table 3 is vibrated, It is possible to experiment with the behavior of the structure 8 in water according to the conditions at that time.

[0009]

However, the water in the water tank 4 is drained, and soil, sand, gravels, water, etc. (hereinafter simply referred to as soil), which cause an earthquake in the structure, are put into the water tank 4, and the ground itself is removed. For example, when experimenting the behavior of the liquefaction phenomenon, or experimenting the behavior according to the properties of the ground of the structure on the ground, the following problems occur.

[0010] That is, when soil is put into the water tank 4, they enter the concave portion of the vibration-absorbing seal member 5, making the elastic deformation of the member 5 impossible. For this reason, the vibration of the vibration table 3 cannot be absorbed by the vibration absorbing seal member 5, and the device does not function.

When the vibration-absorbing seal member 5 is attached to the water tank 4 and the vibrating table 3 with its concave portion facing downward, the same phenomenon as described above occurs because the member 5 is inverted by earth pressure. Will not work.

The present invention has been made to solve such a conventional problem, and has a vibration-absorbing seal member capable of absorbing vibration of a vibrating table even when soil is put in a water / earth tank. It is an object of the present invention to provide a water and soil shaking table device.

[0013]

Means for Solving the Problems Water provided by the present invention
The underground shaking table apparatus is described in the following (1) to (4).

(1) A part of the bottom wall of the water / soil tank is used as a shaking table, and the gap is sealed in a gap between the bottom wall and the shaking table.
And a vibration-under-water shaking table device to which a vibration-absorbing seal member made of an elastic body that absorbs vibration of the vibration table is attached, wherein the vibration-absorbing seal member is a member that forms a space capable of adjusting an internal pressure in the gap. A water and soil shaking table device (hereinafter referred to as a first water and soil shaking table device).

(2) A part of the bottom wall of the water / soil tank is used as a shaking table, and the water / soil tank and the shaking table are provided with a fixed partition wall and a vibration partition wall for partitioning the water / soil tank, respectively. In the gap between the partition wall and the vibration table and the vibration partition wall, seal the gap,
And a vibration-under-water shaking table device provided with a vibration-absorbing seal member made of an elastic body that absorbs vibrations of the vibration table and the vibration partition wall, wherein the vibration-absorbing seal member forms a space in the gap where an internal pressure can be adjusted. Water,
Underground shaking table apparatus (hereinafter, referred to as a second underwater shaking table apparatus).

(3) A part of the bottom wall of the water / soil tank is used as a shaking table, and the water / soil tank and the shaking table are provided with a fixed partition wall and a vibration partition wall for partitioning the water / soil tank, respectively. In the gap between the partition wall and the vibration table and the vibration partition wall, seal the gap,
A water-and-earth shaking table device provided with a vibration-absorbing seal member made of an elastic body that absorbs vibration of the vibration table and the vibration partition wall, wherein the vibration-absorbing seal member is a member that forms a space in the gap. A water / soil shaking table device (hereinafter referred to as a third water / soil shaking table device).

(4) A part of the bottom wall of the water / soil tank is used as a shaking table, and the water / soil tank and the shaking table are provided with a fixed partition wall and a vibration partition wall for partitioning the water / soil tank, respectively. In the gap between the partition wall and the vibration table and the vibration partition wall, seal the gap,
A water-and-earth shaking table device equipped with a vibration-absorbing seal member made of an elastic body that absorbs vibration of the vibration table and the vibration partition wall, wherein the vibration-absorbing seal member is a member having a hat-shaped cross section. Water and soil shaking table equipment
Water and soil shaking table equipment. ).

[0018]

The vibration-absorbing seal member of the first and second underwater shaking table devices is elastically deformable to form a space in which the internal pressure can be adjusted in the gap between the fixed portion and the vibrating portion of the water and earth tank. Since it is a member, it can maintain an optimum space while adjusting the internal pressure even when receiving earth pressure. For this reason, the vibration of the vibration table can be absorbed by the deformation of the same member toward the space side.

Since the vibration-absorbing seal member in the third water / soil shaking table apparatus is an elastically deformable member that forms a space in a gap between the fixed portion and the vibrating portion of the water / soil tank, The space can be maintained by appropriately selecting the performance of the vibration-absorbing seal member. For this reason, the vibration of the vibration table can be absorbed by the deformation of the same member toward the space side.

Since the vibration-absorbing seal member in the fourth water / soil shaking table apparatus is an elastically deformable hat-shaped cross-section member that seals the gap between the fixed part and the vibrating part of the water / soil tank,・ If receiving the pressure of the water put in the earthen tank,
It is still elastically deformable against the pressure. For this reason,
The vibration of the shaking table can be absorbed by the deformation of the same member.

[0021]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a plan view showing an embodiment (hereinafter, referred to as Embodiment 1) of a first underwater shaking table apparatus, and FIG. 2 is an enlarged cross-sectional view taken along line BB of FIG. FIG. FIG. 1 is FIG.
0 and FIG. 2 correspond to FIG.

Embodiment 1 is an example in which a vibration-absorbing seal member 11 as shown in FIG. 2 is used in place of the vibration-absorbing seal member 5 in the conventional underwater vibration table apparatus shown in FIGS.

The vibration-absorbing seal member 11 is composed of a rubber-made annular tube 11a and a pair of rubber-made flange portions 11b provided on a side surface thereof and extending in a radial direction.
A flange portion 11b is attached to the bottom wall 21a of the earthen tub 12 and the shaking table 13.
Are attached by bolts and sealing material,
It is mounted in the gap between 2a and 13.

The annular tube 11b has a watertight and airtight structure, and its internal pressure can be adjusted by an unillustrated accumulator. The other configuration is substantially the same as the conventional underwater shaking table apparatus shown in FIG.

The water / soil shaking table apparatus of the first embodiment is, as described above, provided in the gap between the bottom wall 12a of the water / soil tank 12 and the shaking table 13 with a rubber vibration-absorbing seal capable of adjusting the internal pressure. Member 11
Is attached, the space in the annular tube 11b can be maintained by adjusting the internal pressure even when receiving the pressure of the soil put in the water / soil tank 12.

Therefore, the vibration of the vibration table 13 is absorbed by the deformation of the annular tube 11b toward the space.

(Embodiment 2) FIG. 3 is a cross-sectional view showing a main part of another embodiment (hereinafter, referred to as Embodiment 2) of the first water / soil shaking table apparatus, which corresponds to FIG. It is.

The second embodiment is different from the first embodiment in that the vibration-absorbing seal member 11 shown in FIG.
This is an example using No. 1.

The vibration-absorbing seal member 21 is composed of a pair of annular bands 21a having a hat-shaped cross section. One annular body 21
a, the flange portion f is provided on the bottom wall 22a of the water / soil tank 22 and the upper surface of the vibrating table 23, and the other annular band 21a is provided with the flange portion f provided on the lower surfaces of the 22a and 23, respectively, with a bolt and a sealing material. By being attached in a water-tight and air-tight manner, it is mounted in the gap between the two 22a, 23.

In the mounted state, an annular space is formed in the gap. The internal pressure of the space can be adjusted by an unillustrated accumulator. The other configuration is substantially the same as the conventional underwater shaking table apparatus shown in FIG.
The operation and effect are the same as those of the first embodiment.

(Embodiment 3) FIG. 4 is a plan view showing an embodiment (hereinafter, referred to as Embodiment 3) of a second underwater shaking table apparatus, and FIG. 5 is an enlarged view of a main part of FIG. is there. Embodiment 3 corresponds to FIG.
11 is replaced with the water / soil tank 31 shown in FIG. 4 in the underwater shaking table apparatus shown in FIG. This is an example using 32.

As shown in FIG. 4, the water and earth tank 31
Water / soil tank body 31a corresponding to the water / soil tank 12 of FIG.
Further, a partition wall including a fixed partition wall 31b provided thereon and a vibration partition wall 31c provided on the vibration table 33 is provided. The water / soil tank main body 31a is divided into an A zone and a B zone by this partition wall.

The vibration-absorbing seal member 32 is attached to a gap between the bottom wall 31d and the fixed partition wall 31b of the water / soil tank 31 and the vibration table 33 and the vibration partition wall 31c.

Two vibration-absorbing seal members 32 are used, each of which is a tube 32a made of rubber and closed at both ends.
And a pair of radially extending rubber flanges 32b provided on the side surfaces thereof. Tube 32a
Can be adjusted by an unillustrated accumulator.

The single vibration-absorbing seal member 32 is mounted on the bottom wall 31b, the fixed partition wall 31b, the vibrating table 33, and the vibration partition wall 31c with the flange portion 32b from the zone A side by bolts and a sealing material. Installed in the gap. The other one of the vibration-absorbing seal members 32 is similarly attached to the gap from the zone B side.

The other structure is the same as the conventional underwater shaking table apparatus shown in FIG. The operation and effect are not essentially different from those of the first embodiment.

(Embodiment 4) In Embodiment 4, as shown in FIG. 6, the tube 3 of the vibration-absorbing seal member 32 in Embodiment 3 is used.
This is an example in which a rubber tube 34 is inserted into 2a. In this way, it is possible to control that the tube 32a is largely compressed and deformed by the pressure of the soil put in the A and B zones.

In the third and fourth embodiments, a tube having a watertight and airtight structure is used, but a tube having both ends opened may be used. In this case, it is necessary to appropriately select performance such as elastic strength.

(Embodiment 5) FIG. 7 is a plan view showing another embodiment (hereinafter, referred to as Embodiment 5) of the second water / soil shaking table apparatus, and FIG. 8 is an enlarged view of a main part of FIG. FIG.

The fifth embodiment is similar to the third embodiment (FIGS. 4 and 5).
Instead of the vibration-absorbing seal member 32 in FIG. 8, a vibration-absorbing seal member 41 as shown in FIG.
This is an example in which a water tank 42 having the same shape as the earth tank 31 is used.

The water / soil tank 42 is, as shown in FIG.
Water / soil tank main body 42a corresponding to the water / soil tank 12 of FIG.
Further, a partition wall comprising a fixed partition wall 42b provided thereon and a vibration partition wall 42c provided on the vibration table 43 is provided. The water / soil tank main body 42a is divided into an A zone and a B zone by the partition wall.

The vibration-absorbing seal member 41 is attached to a gap between the bottom wall 42d and the fixed partition wall 42b of the water / soil tank 42 and the vibration table 43 and the vibration partition wall 42c.

The vibration-absorbing seal member 41 has a hat-shaped cross section.
It consists of a book member and one closing member. Both are made of rubber. One is formed on the bottom wall 42d and the lower surface of the vibrating table 43 at the flange portion 5 like the annular band 21 in FIG.
An annular band 41a (not shown in the drawing) attached with a bolt and a sealing material, one of which is disposed on the bottom wall 42d and the fixed partition wall 42b, the vibrating table 43 and the vibration partition wall 42c from the A zone side. In the flange portion f, an open annular band 41b attached with a bolt and a sealing material, one is an open annular band 41c similarly attached from the B zone side, and one closing member 41d is a fixed partition It is a rubber closing member for closing an opening of a space formed by the wall 42b, the vibration partition wall 42c, and the open annular bands 41b, 41c.

The internal pressure of the space formed in the gap by the vibration absorbing seal member 41 can be adjusted by an accumulator. Other configurations are the same as those of the conventional underwater shaking table apparatus shown in FIG. The operation and effect are the same as those of the third embodiment. Note that the closing member 41d may not be provided. In that case, it is necessary to appropriately consider the pressure resistance performance and the like of the vibration absorbing seal member. Further, for example, if water is to be supplied only to the A zone, a member having a hat-shaped cross section may be attached from the A zone side.

[0046]

As described above, according to the water / soil shaking table apparatus of the present invention, the elasticity for forming the space capable of adjusting the internal pressure is provided in the gap between the fixed portion and the vibrating portion of the water / soil tank. Since the deformable vibration-absorbing seal member is attached, the space can be maintained even under the pressure of the soil put in the water / soil tank. For this reason, the vibration of the vibrating table can be absorbed by the deformation of the same member toward the space side.

Therefore, according to the water / soil shaking table apparatus of the present invention, for example, a seismic test of a ground formed in a water / soil tank or a seismic test of a structure on a different ground can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a shaking table device in water and soil according to a first embodiment.

2 is an enlarged cross-sectional view taken along the line BB of FIG. 1;

FIG. 3 is a sectional view of a main part of a shaking table apparatus in water and soil according to a second embodiment.

FIG. 4 is a plan view of a water / underground shaking table apparatus according to a third embodiment.

FIG. 5 is an enlarged view of a main part of FIG. 4;

FIG. 6 is a plan view of an essential part of a water / underground shaking table apparatus according to a fourth embodiment.

FIG. 7 is a plan view of a main part of a water and soil shaking table apparatus according to a fifth embodiment.

FIG. 8 is an enlarged view of a main part of FIG. 7;

FIG. 9 is a longitudinal sectional view of a conventional underwater shaking table apparatus.

FIG. 10 is a plan view of a conventional underwater shaking table apparatus.

11 is an enlarged cross-sectional view taken along the line AA of FIG. 10;

[Explanation of symbols]

 11, 21, 32, 41 Vibration absorbing seal member 12, 22, 31, 42 Water / earth tank 13, 23, 33, 43 Shaking table 34 Tube

Claims (4)

[Claims] 1. A vibration table, wherein a part of a bottom wall of a water / soil tank is used as a vibration table, a gap between the bottom wall and the vibration table is sealed, and a vibration absorbing member made of an elastic body absorbing vibration of the vibration table is used. A water and soil shaking table device having a seal member mounted therein, wherein the vibration absorbing seal member is a member that forms a space in the gap where an internal pressure can be adjusted. 2. A part of the bottom wall of the water / soil tank is used as a shaking table, and the water / soil tank and the shaking table are provided with a fixed partition wall and a vibration partition wall for partitioning the water / soil tank, respectively. A water and soil shaking table device in which a gap between the wall, the shaking table and the vibration partition wall is sealed, and a vibration absorbing seal member made of an elastic body that absorbs vibration of the shaking table and the vibration partition wall is attached. In addition, the vibration-absorbing seal member is a member that forms a space in which an internal pressure can be adjusted in the gap. 3. A part of the bottom wall of the water / soil tank is used as a shaking table, and the water / soil tank and the shaking table are provided with a fixed partition wall and a vibration partition wall for partitioning the water / soil tank, respectively. A water and soil shaking table device in which a gap between the wall, the shaking table and the vibration partition wall is sealed, and a vibration absorbing seal member made of an elastic body that absorbs vibration of the shaking table and the vibration partition wall is attached. The vibration-absorbing seal member is a member that forms a space in the gap. 4. A part of the bottom wall of the water / soil tank is used as a shaking table, and the water / soil tank and the shaking table are provided with a fixed partition wall and a vibration partition wall for partitioning the water / soil tank, respectively. A water and soil shaking table device in which a gap between the wall, the shaking table and the vibration partition wall is sealed, and a vibration absorbing seal member made of an elastic body that absorbs vibration of the shaking table and the vibration partition wall is attached. In addition, the vibration-absorbing seal member is a member having a hat-shaped cross section, and is a shaking table device under water and underground.