JP4392617B2 - Horizontal displacement measuring device for seismic isolation structures - Google Patents

Description

  The present invention relates to a measuring device that measures a relative horizontal displacement of an upper structure relative to a lower structure in a base-isolated structure in which a seismic isolation device is interposed between the upper structure and the lower structure.

There is a need to measure and record the deformation of each part of the structure in order to acquire information on the response characteristics and performance degradation of the structure affected by disturbances such as earthquakes. In particular, seismic isolation structures with seismic isolation devices are structures that reduce the seismic input acceleration by large horizontal deformation of the seismic isolation layer during an earthquake, so it is not possible to measure and record the horizontal deformation of the seismic isolation layer. It is very important to understand the response characteristics of the structure and confirm the performance of the seismic isolation device.
Conventionally, a simple recording apparatus using a writing instrument or the like has been used to meet such a demand. For example, in Patent Document 1, a pressure-sensitive recording sheet that has been subjected to moisture-proofing is attached to an observation recording table provided on a foundation that constitutes a lower structure, and a pen-like member provided on a beam that constitutes the upper structure. The invention is such that the tip of the head is pressed against the recording paper at a pressure required for pressure-sensitive recording by the spring of the mounting device, and the state of relative horizontal movement relative to the foundation of the beam can be pressure-sensitive recorded on the recording paper during an earthquake. It is disclosed.
JP 2002-168962 A

  However, the above method is merely a simple method, and only information about the direction of deformation and the maximum value can be obtained. In order to obtain detailed data, it is necessary to measure using a measuring device that combines a contact displacement sensor using a rod or wire or a non-contact displacement sensor using a laser with a measuring jig. is there. However, since the seismic isolation layer usually deforms in two horizontal directions and the maximum horizontal displacement is about several tens of centimeters, a displacement sensor is installed in each of the two horizontal directions, and a large target ( Must have a fixed point). As a result, there is a problem that the measuring apparatus becomes large and costs increase.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a simple measuring device that can measure the displacement of the seismic isolation layer in two horizontal directions with high accuracy.

  In order to achieve the above object, the present invention measures the relative horizontal displacement of the upper structure relative to the lower structure in the base isolation structure in which the base isolation device is interposed between the upper structure and the lower structure. A measuring device, a rod pivotally supported by a first support portion installed on one of the upper structure or the lower structure and rotating in a horizontal plane; and the other of the upper structure or the lower structure A measuring jig which is pivotally supported by a second support portion installed on the rod and which is movable on the rod in the rod axis direction, a rotation angle measuring means for measuring a rotation angle of the rod, An axial displacement measuring means for measuring the displacement of the movable part in the rod axial direction is provided.

When the upper structure moves in the horizontal direction with respect to the lower structure, the rod rotates in a horizontal plane around the first support portion, and the movable portion moves on the rod in the rod axis direction. If the rotation angle θ of the rod at this time and the rod axial displacement L of the movable part are measured, the horizontal displacement of the seismic isolation layer (relative horizontal displacement of the upper structure relative to the lower structure) X, Y is X = L · cos θ and Y = L · sin θ can be uniquely obtained.
In the present invention, a rod that is pivotally supported by a first support portion installed on one of the upper structure and the lower structure and rotates in a horizontal plane, and a second that is installed on the other of the upper structure and the lower structure. Using a simple measuring jig that is pivotally supported by the support and consists of a movable part that moves on the rod in the axial direction of the rod, the rotational angle θ of the rod is measured by the rotational angle measuring means, and the axial displacement is measured. By measuring the rod axial displacement L of the movable part by means, the horizontal two-direction displacements X and Y of the seismic isolation layer can be measured with high accuracy.

In the present invention, a potentiometer may be used for the rotation angle measuring means, and a rotary encoder may be used for the axial displacement measuring means.
The rotation angle of the rod is measured by a potentiometer installed at the part that supports the rod or the movable part, and the displacement of the movable part in the axial direction of the rod is provided with a mechanism that converts the linear movement of the movable part into a rotational movement. Measure with a rotary encoder installed at the site.

  According to the horizontal displacement measuring apparatus for a seismic isolation structure according to the present invention, a rod that is pivotally supported by a first support portion installed on one of the upper structure and the lower structure and rotates in a horizontal plane, and the upper structure Using a simple measuring jig that is pivotally supported by a second support part installed on the other side of the object or the substructure, and that is movable on the rod in the rod axis direction, the rotation angle of the rod By measuring the rotation angle and measuring the rod axial displacement of the movable part by the axial displacement measuring means, it is possible to measure the displacement of the seismic isolation layer in two horizontal directions with high accuracy.

Hereinafter, an embodiment of a horizontal displacement measuring device for a seismic isolation structure according to the present invention will be described with reference to the drawings.
FIG. 1 shows a horizontal displacement measuring apparatus according to the present invention.
The floor where the seismic isolation device 4 is installed is referred to as a seismic isolation layer S, and the horizontal displacement measuring device 1 is installed in the seismic isolation layer S. For horizontal seismic isolation, not only the laminated rubber shown in FIG. 1, but also other horizontal seismic isolation devices such as roller bearings and sliding bearings may be used.
The horizontal displacement measuring device 1 is pivotally supported by a first support portion 13 fixed to the lower structure 3 and fixed to the upper structure 2 and a rod 11 that rotates around the first support portion 13 in a horizontal plane. The measuring jig is comprised of a movable part 12 that is pivotally supported by the second support part 14 and movable on the rod 11 in the rod axial direction. A potentiometer and a rotary encoder built in the movable part 12 are used. Then, the rotation angle θ of the rod 11 and the rod axial displacement L of the movable portion 12 are measured.

  When the upper structure 2 moves in the horizontal direction with respect to the lower structure 3, the rod 11 rotates in the horizontal plane around the first support portion 13, and the movable portion 12 moves on the rod 11 in the rod axis direction. To do. If the rotation angle θ of the rod 11 at this time and the rod axial displacement L of the movable part 12 are measured, the horizontal displacement of the base isolation layer S (relative horizontal displacement of the upper structure 2 with respect to the lower structure 3) X, Y can be uniquely determined as X = L · cos θ and Y = L · sin θ from the rotation angle θ of the rod 11 and the displacement L in the rod axis direction of the movable portion 12.

  FIG. 2 shows the trajectory T of the base end portion 11a on which the rod 11 is pivotally supported. For example, when the base end portion 11a draws a counterclockwise circle as shown in FIG. 2, the rotation angle θ of the rod 11 and the rod axis direction displacement L of the movable portion 12 draw a time history as shown in FIG.

FIG. 4 shows details of the horizontal displacement measuring apparatus 1.
The movable portion 12 includes a box-shaped housing 18, and the rod 11 passes through the housing 18. Bearings 18 a and 18 a are mounted on both end faces of the housing 18, the rod 11 is supported by the bearings 18 a and 18 a, and the housing 18 can slide along the rod 11.
A pulley 17 that is in sliding contact with the rod 11 is built in the housing 18, and the pulley 17 is rotated when the housing 18 slides along the rod 11 (that is, the rod axial displacement L occurs). It has become. A rotary encoder 16 having the same rotational axis as the pulley 17 is attached to the pulley 17. The rotary encoder 16 detects the rotational speed of the pulley 17, and the rod axial displacement L is calculated from the rotational speed of the pulley 17. .
When the number of rotations of the pulley 17 is small, a potentiometer may be used instead of the rotary encoder.

  A potentiometer 15 is built in the housing 18, and the shaft portion 15 a of the potentiometer 15 is fixed to the second support portion 14. When the rod 11 rotates in a horizontal plane, the potentiometer 15 rotates about the shaft portion 15a, and the rotation angle θ of the rod 11 is measured.

  The joint between the rod 11 and the first support portion 13 is a universal joint 19. Therefore, even if the upper structure 2 is locked, the rod 11 does not rotate in the vertical plane, and the horizontal displacement measuring device 1 is not damaged.

  In the seismic isolation structure horizontal displacement measuring apparatus 1 according to the present embodiment, the rod 11 that is pivotally supported by the first support 13 fixed to the lower structure 3 and rotates in the horizontal plane is fixed to the upper structure 2. The rotation angle θ of the rod 11 is measured by the potentiometer 15 by using a simple measuring jig that is pivotally supported by the second support portion 14 and that is movable on the rod 11 in the rod axis direction. At the same time, by measuring the displacement L in the rod axis direction of the movable portion 12 by the rotary encoder 16, the displacements X and Y in the two horizontal directions of the seismic isolation layer can be measured with high accuracy.

  As mentioned above, although embodiment of the horizontal displacement measuring apparatus of the seismic isolation structure based on this invention was described, this invention is not limited to said embodiment, It can change suitably in the range which does not deviate from the meaning. . For example, in the above embodiment, the potentiometer is built in the movable part, but may be installed on the shaft part of the first support part. Needless to say, the mechanism for converting the linear motion of the rod into a rotational motion is not a pulley but may be another mechanism such as a rack and pinion. The point is that the desired function can be obtained in the present invention.

The horizontal displacement measuring device which concerns on this invention is shown, (a) is the elevation view, (b) is a top view. It is the figure which showed the locus | trajectory of a rod base end part. It is the figure which showed the time history change of the axial direction deformation amount L of a rod, and the rotation angle (theta) of a rod. The detail of a horizontal displacement measuring device is shown, (a) is the standing sectional view, (b) is a plane sectional view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal displacement measuring device 2 Upper structure 3 Lower structure 4 Seismic isolation device 11 Rod 12 Movable part 13 First support part 14 Second support part 15 Potentiometer 16 Rotary encoder 17 Pulley 18 Housing 19 Universal joint S Seismic isolation layer

Claims (2)

In a seismic isolation structure in which a seismic isolation device is interposed between an upper structure and a lower structure, the measuring device measures the relative horizontal displacement of the upper structure with respect to the lower structure,
A rod that is pivotally supported in a horizontal plane by a first support portion installed on one of the upper structure or the lower structure, and a second that is installed on the other of the upper structure or the lower structure. A measuring jig that is pivotally supported by a support portion and includes a movable portion that moves on the rod in the rod axis direction;
A horizontal displacement measuring device for a seismic isolation structure, comprising: a turning angle measuring means for measuring a turning angle of the rod; and an axial displacement measuring means for measuring a displacement in a rod axis direction of the movable portion.   2. The seismic isolation structure horizontal displacement measuring apparatus according to claim 1, wherein the rotation angle measuring means is a potentiometer, and the axial displacement measuring means is a rotary encoder.

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