JP3253252B2 - Seismic isolation base structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base-isolated base structure, and more particularly, to a base-isolated base capable of effectively absorbing vertical and horizontal vibrations caused by an earthquake or the like and preventing transmission of the vibrations to an upper structure. Related to structures.

[0002]

2. Description of the Related Art As a conventional seismic isolation structure, for example, there is an invention described in Japanese Patent Application Laid-Open No. H8-240033.

That is, in this prior art, as shown in FIG. 4, a seismic isolation member 2 'and a rolling member 7' are mounted at predetermined positions on the lower surface of a foundation beam 6 '. 7 'absorbs the vertical and horizontal vibrations and prevents the transmission of the vibrations to the upper structure B' built on the foundation beam 6 '.

[0004]

However, in the above-described conventional seismic isolation base structure, since the vertical load of the upper structure 6 'is supported only by the rolling members 7', an earthquake or the like is required. When the horizontal vibration due to is large, there is not much problem, but when such vibration is relatively small, the smooth rolling of the rolling member 7 ′ is disturbed and it cannot be absorbed, There was a serious problem that the vibration was transmitted to the upper structure B '.

[0005] The base beam 6 'is directly supported by the seismic isolation members 2' and the rolling members 7 'arranged on the base beam 6'.
Since there is no work space, there was also a management defect that maintenance such as maintenance and inspection of the seismic isolation material 2 'etc. could not be performed after construction.

[0006] Therefore, the present invention has been made to solve the above-mentioned conventional problems, and it is possible to surely prevent the transmission of vibrations to the upper structure, and to secure a work space. The task is to provide maintenance and inspection services.

[0007]

In order to solve the above-mentioned problems, means adopted by the present invention is a pit P having an upper opening shape.
A plurality of columns 3 are erected through the seismic isolation member 2 and a foundation beam 6 projecting laterally from the columns 3 is provided with a rolling member 7.
And the vertical structure of the upper structure B constructed on the foundation beam 6 is supported by the seismic isolation member 2.

Accordingly, the vertical load of the upper structure B constructed on the base isolation structure is supported by the seismic isolation member 2 through the column 3, and the rolling member 7 is supported by the vertical load. The rolling operation is not hindered, and the smooth rolling operation is favorably maintained.

[0009] The vertical vibration caused by an earthquake or the like is as follows .
The restoring force and the damping effect of MenShinzai 2 comprises, also, vibration in the horizontal direction, the rolling member 7 regardless foundation beam 6 on the magnitude
For example, by rolling the upper surface of the foundation 1 in the horizontal direction.
Therefore, they are not transmitted to the upper structure B.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION One embodiment of a seismic isolation base structure according to the present invention will be described below with reference to the drawings.

In FIGS. 1 to 3, P denotes a box-shaped pit having an open top and buried in the ground, and is made of reinforced concrete or the like. Reference numeral 1 denotes a foundation laid on the ground G at predetermined intervals around the pit P so that the pit P is arranged at the center.

Reference numeral 2 denotes four seismic isolation members fixed to the upper bottom surface of the pit P, which are arranged at four points corresponding to the vertices of a square.
An iron plate or the like is adhered to both ends of an elastic body made of neoprene rubber or the like to provide a restoring force and a damping effect.

Numerals 3 denote standing columns which are fixed to the upper part of each of the seismic isolation members 2 with the lower end fixed thereto. ing.

Reference numeral 6 denotes a foundation beam made of an I-shaped steel, and an inner foundation beam 6a having one end fixed to the upper end and two outer surfaces of each column 3 respectively.
And an outer foundation beam erected on the other end face of the inner foundation beam 6a
6b.

Reference numeral 7 denotes a rolling member composed of rotatable rollers mounted on the lower surface of the outer foundation beam 6b located on an extension of the inner foundation beam 6a. The rolling member 7 is configured to be rotatable in the horizontal direction. In addition, it is rollably supported by a recess 8a of a channel 8 fixed to the upper surface of the foundation 1.

Numeral 9 denotes an auxiliary beam made of I-shaped steel erected between the inner side foundation beams 6a on the long side and between the inner side foundation beam 6a and the outer side foundation beam 6a. Reference numeral 10 denotes a tension member that is diagonally installed in a rectangular space formed by the horizontal member 4, the foundation beam 6, and the auxiliary beam 9, and includes a wire 12 having a turnbuckle 11.

In this embodiment, the upper structure B is constructed on the substructure A, and most of the vertical load is supported by the seismic isolation member 2,
The vertical load applied to the rolling member 7 is set to be a small load.

When a vibration such as an earthquake occurs, the vertical vibration is reduced by the restoring force and damping of the seismic isolation material 2.
Due to the effect, horizontal vibrations are
The rolling member 7 of the foundation beam 6 is, for example,
The upper structure B by rolling in
Is not transmitted.

In this case, most of the vertical load of the upper structure B is supported by the seismic isolation member 2, so that the rolling operation of the rolling member 7 is hindered by the vertical load of the upper structure B. The smooth rolling motion is maintained regardless of the magnitude of the vibration, and the transmission of the vibration to the upper structure B is reliably prevented.

Although the number of columns 3 is generally four as in the above-described embodiment, the present invention is not limited to this, and a plurality of columns 3 may be provided depending on the shape of the upper structure B and the like. What is necessary is just to form the foundation structure by combining the support | pillar 3 and the foundation beam 6 suitably.

As shown by a two-dot chain line in FIG. 1, when an entrance 14 communicating with the pit P is opened on the floor 13 of the upper structure B, a person enters and exits the pit P via the entrance 14. Therefore, it is possible to provide a favorable effect that the system can be used for maintenance such as maintenance and inspection of the base isolation structure.

Further, the rolling member 7 is not limited to the roller as in the above embodiment, but may use a ball or the like.

The upper structure B is applicable regardless of whether it is a steel structure or a wooden structure.

In addition, the shape of the pits P and the laying shape of the foundation 1 can be freely changed within the range intended by the present invention.

[0025]

As described above, the present invention is configured so that the vertical load of the superstructure constructed on the foundation beam is supported by the seismic isolation material, so that the rolling member is rolled by the vertical load. The dynamic motion is not disturbed as in the conventional one, and therefore, the smooth rolling motion is maintained regardless of the magnitude of the vibration, and as a result, the transmission of the vibration to the upper structure can be prevented well. The effect was obtained.

In addition, by allowing a person to enter and exit the pit as described in claim 2, a unique effect is provided in that it can be used for maintenance such as maintenance and inspection of the seismic isolation base structure. Become.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view according to an embodiment of the present invention.

FIG. 2 is a plan view of the pit and a basic portion.

FIG. 3 is a plan view showing a state in which the foundation beams are provided.

FIG. 4 is a partial cross-sectional front view showing a conventional example.

[Explanation of symbols]

 2 ... seismic isolation material 3 ... prop 6 ... foundation beam 7 ... rolling member 13 ... floor surface 14 ... entrance P ... pit

Claims (2)

(57) [Claims] 1. A plurality of columns (3) are erected through a seismic isolation material (2) in an upper open pit (P).
A foundation beam (6) protruding laterally from (3) is movably supported by a rolling member (7), and furthermore, a superstructure (B) constructed on the foundation beam (6). Vertical load is the seismic isolation material (2)
A base-isolated base structure characterized by being configured to be supported by: 2. The seismic isolation device according to claim 1, wherein an entrance (14) is opened in the floor (13) of the pit (P) so that people can enter and exit from the superstructure (B). Substructure.