JP2964227B2 - Planar sensor for structural abnormality detection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar sensor for detecting an abnormality in a structure, and more particularly, to a fracture of a member due to fatigue of a structure such as a bridge, a steel tower, other buildings, and a mechanical structure such as a construction machine. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar sensor for detecting an abnormality of a structure for detecting an abnormality at the time of occurrence of an earthquake, a typhoon, a flood, or another abnormal force that may cause a large external force.

[0002]

2. Description of the Related Art In general, structures are designed and constructed with predetermined strength and stability or safety. Especially, in the event of an earthquake, a typhoon, a flood or other abnormalities, the displacement, pressure or It is required to detect a change in stress and also a load carrying capacity.

However, detecting a change in stress or displacement in a predetermined portion of a structural material by a predetermined detection or measurement means means that there is no proper detection method other than always checking by human eyes. There's a problem. In addition, it is very difficult to always detect by human eyes as actual work. Therefore, even if the detection work is performed after something abnormal due to an earthquake or the like, it is not necessary to constantly monitor the deviation from the installation state when the bridge etc. was functioning normally, and to ensure safety. There is a problem that this is not an appropriate detection method.

Therefore, by interposing a planar sensor between a support member of a structure and a structural member supported on the upper portion by the support member, a steady state of the structural member supported by the support member is obtained. The abnormality from the state of the structure can be detected by the change from the state of normal operation.

However, the load on a bridge or other structure is very large and moves in an arbitrary direction in the event of an abnormality. Accordingly, the structural material is deformed or changed (displacement in a plane, direction of the displacement and pressure increase / decrease). There has been no flat sensor having a function capable of detecting a change in amount, reaction force, or stress.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and particularly relates to a structure having a large load and capable of detecting a change in a plane from a steady state in a plane. It is an object to provide a detection flat sensor.

Another object of the present invention is to provide a planar sensor for detecting an abnormality of a structure, which has a detection function while enduring a large load from the structure.

Further, the present invention provides a structure capable of detecting a displacement amount and a pressure increase / decrease amount of a structure from a reference position, a change in a reaction force or a stress, and a displacement as a rotation angle from a reference position in any direction. It is an object to provide a flat sensor for detecting an abnormality of an object.

Another object of the present invention is to provide a planar sensor for detecting an abnormality of a structure, which can be disposed between a support member of the structure and the structural material and capable of detecting a change in the structure.

[0010]

That is, the present invention focuses on receiving most of the load from a structure by a strength member, and performing actual detection by a sensor body integrated with the strength member. In, a planar sensor base that can be arranged between the support and the structural material of the structure and that is composed of a strength member, and the support and the structural material are provided in a sensor groove formed in the sensor base. And a sensor main body provided so as to detect a relative change of the structure.

[0011] The sensor main body may have a detection element concentrically arranged on the sensor base.

[0012] The sensor body may include detection elements arranged in a matrix on the sensor base.

[0013] The sensor main body may have detection elements radially arranged on the sensor base.

[0014] The sensor main body may have a detection element arranged in a spiral shape on the sensor base.

As the above-mentioned strength member, an external force is not directly received by the above-mentioned sensor main body, but the sensor main body is cut into the above-mentioned sensor groove and the sensor main body is buried in the supporting member (base material). Generally, iron or other material having sufficient compressive strength is employed. The sensor body is basically made of a synthetic resin material such as a rubber material or a silicon material.

In the planar sensor for detecting an abnormality of a structure according to the present invention, the planar sensor base is formed of a strength member, and the planar sensor is disposed between a support member of the structure and the structural member. Since the sensor body is provided in the sensor groove formed in the sensor base, the sensor base receives most of the large load applied between the support member and the structural member, and the sensor main body receives a small portion thereof.
Thus, a relative change between the support member and the structural member (a shift in a plane, a direction of the shift, a change in pressure, a change in a reaction force or a stress, etc.) can be detected, and the sensor base and the sensor body can be detected. If the ratio of the load received is grasped, the state of the load as a whole and its change can be detected.

As the arrangement or distribution pattern of the sensor body, concentric, matrix, radial, elliptical or any other pattern can be adopted, and it is selected according to the characteristics of the structure to be detected. More appropriate detection can be performed.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a planar sensor for detecting an abnormality of a structure according to a first embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. FIG. 1 is a plan view of a structural abnormality detecting device 1 employing a structural abnormality detecting planar sensor according to the present invention. The structural abnormality detecting device 1 includes an abnormality detecting planar sensor 2 and a sensor. It has a driver 3 and a control circuit 4.

FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1. The abnormal state detecting flat sensor 2 has, for example, a disk-shaped sensor base 5 and a sensor main body 6. The sensor base 5 is made of a material having a predetermined strength such as an iron material, and has a sensor groove 7 formed concentrically on the surface thereof, and a plurality of concentric detections are formed in the sensor groove 7. The element 8 is provided to constitute the sensor body 6. The sensor body 6 is located within the sensor groove 7.
The installation height is adjusted to the height of the sensor base 5, or the mounting height protrudes from the surface of the sensor base 5 by a slight height H.

FIG. 3 is an enlarged sectional view of an essential part in a state where the abnormality detecting flat sensor 2 is provided at, for example, a support portion of a bridge 9 (structure). The bridge 9 is composed of a support member 10 and this support member. And a structural material 11 supported on the upper part of the reference numeral 10. The plane sensor 5 is provided between the support member 10 and the structural member 11. That is, the support top 10A of the support member 10 is arranged at a substantially central position of the flat sensor 5.

FIG. 4 is a plan view of a portion of the planar sensor 2 for abnormality detection. As described above, the planar sensor 2 for irregularity detection has a plurality of concentric circles having a planar spread in the plane. Are arranged. Accordingly, it is possible to detect a relative displacement of the structural member 11 in the plane with respect to the support member 10.

FIG. 5 is a graph showing a pressure distribution between the support member 10 and the structural member 11 detected by the abnormality detecting flat sensor 2, wherein the distribution is in a steady state (solid line in the figure) and the structural member 11 is supported. A distribution (dotted line in the figure) in a state shifted from the material 10 (support top 10A) and a distribution in a state where the pressure is increased in the support top 10A (dashed line in the figure) are shown.

In the abnormality detection device 1 having such a configuration,
Most of the large load from the structural material 11 is transferred to the sensor base 5
Therefore, the sensor body 6 needs to receive only a small portion of the load at a portion protruding by the height H, and can perform an appropriate detection action.

If the relative position between the support member 10 and the structural member 11 changes during an earthquake or other abnormal condition,
When the load applied to the support member 10 changes from the reference position 1, as shown in FIG.
Can be detected. Of course, as shown in FIG. 4, the abnormality detection plane sensor 2 can detect a change in a plane, and therefore, the direction of displacement can be detected, for example, as a rotation angle θ from a reference position.

That is, from the changes in the detected amount, the displacement amount D, the pressure increase / decrease amount C, and the rotation angle θ, the supporting member 3
In addition, it is possible to detect how much displacement occurs in which direction with respect to the structural material 4.

Therefore, if any of these exceeds a predetermined set value (threshold), the control circuit 4 outputs this and alerts the outside as a predetermined alarm display or alarm sound. be able to.

In the present invention, an arbitrary pattern can be adopted for the sensor body provided on the sensor base. For example, FIG. 6 is a plan view of the planar sensor 20 for abnormality detection according to the second embodiment of the present invention. The planar sensor 20 for abnormality detection includes a square sensor base 21, a sensor body 22, Having. The sensor body 22 has a plurality of detection elements 23 arranged in a matrix on the sensor base 21.

An abnormality detecting flat sensor 2 having such a configuration
With 0, as in the case of the abnormality detection flat sensor 2 (FIG. 1), it is possible to detect the displacement of the displacement on the plane, the direction thereof, and the change in the pressure increase / decrease or the reaction force or the stress. By forming the detection element 23 as small as possible, relatively precise detection can be performed.

FIG. 7 is a plan view of an abnormality detection flat sensor 30 according to a third embodiment of the present invention. The abnormality detection flat sensor 30 has a square sensor base 31.
And a sensor main body 32. Sensor body 32
Has a plurality of elongated detection elements 33 radially arranged on the sensor base 31.

An abnormality detecting flat sensor 3 having such a configuration
With 0, as in the case of the abnormality detection flat sensor 2 (FIG. 1), it is possible to detect the displacement of the displacement on the plane, the direction thereof, and the change in the pressure increase / decrease or the reaction force or the stress. Since the detection element 33 is simply formed in a strip shape and provided radially, the configuration is simple and the productivity can be improved.

FIG. 8 is a plan view of an abnormality detection flat sensor 40 according to a fourth embodiment of the present invention. The abnormality detection flat sensor 40 has a square sensor base 41.
And a sensor main body 42. Sensor body 42
Has a plurality of elongated detection elements 43 radially arranged on a sensor base 41.

The abnormality detecting flat sensor 4 having the above configuration
With 0, as in the case of the abnormality detection flat sensor 2 (FIG. 1), it is possible to detect the displacement of the displacement on the plane, the direction thereof, and the change in the pressure increase / decrease or the reaction force or the stress. The sensor main body 42 only detects the minimum pressure distribution necessary for detection, and can simplify the structure.

FIG. 9 is a plan view of an abnormality detecting flat sensor 50 according to a fifth embodiment of the present invention. The abnormal detecting flat sensor 50 has a circular sensor base 51.
And a sensor main body 52. Sensor body 52
Has a continuous detection element 53 arranged on the sensor base 51 in an elliptical shape.

An abnormality detecting flat sensor 5 having such a configuration is provided.
With 0, as in the case of the abnormality detection flat sensor 2 (FIG. 1), it is possible to detect the displacement of the displacement on the plane, the direction thereof, and the change in the pressure increase / decrease or the reaction force or the stress. In addition, since the sensor main body 52 is composed of one detection element 53, control by the control circuit 3 can be relatively easily performed.

In each of the above embodiments, the degree of detection can be controlled by gradually changing the width or thickness of the sensor bodies 32, 42, 52 in the length direction.

[0036]

As described above, according to the present invention, the sensor pedestal is formed of a strength member, which receives most of the load of the structure. Necessary detection action can be performed.

[Brief description of the drawings]

FIG. 1 is a plan view of a structure abnormality detection apparatus 1 employing a structure abnormality detection planar sensor 2 according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged cross-sectional view of a main part in a state where the abnormality detection flat sensor 2 is provided on a support portion of, for example, a bridge 9 (structure).

FIG. 4 is a plan view of the abnormality detection flat sensor 2;

FIG. 5 is a graph showing a pressure distribution between the support member 10 and the structural member 11 detected by the abnormality detection flat sensor 2;

FIG. 6 is a plan view of an abnormality detection flat sensor 20 according to a second embodiment of the present invention.

FIG. 7 is a plan view of an abnormality detection flat sensor 30 according to a third embodiment of the present invention.

FIG. 8 is a plan view of an abnormality detection flat sensor 40 according to a fourth embodiment of the present invention.

FIG. 9 is a plan view of an abnormality detection flat sensor 50 according to a fifth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Structure abnormality detection apparatus (FIG. 1) 2 Structure abnormality detection flat sensor (1st Embodiment, FIG. 1) 3 Sensor driver 4 Control circuit 5 Sensor base part by a strength member 6 Sensor main body 7 For sensor Groove 8 Detecting element 9 Bridge (structure) 10 Support material 10A Support top of support material 11 Structural material 20 Planar sensor for detecting structure abnormality (second embodiment, FIG. 6) 21 Sensor base 22 Sensor body Reference Signs List 23 detection element 30 structure abnormality detection flat sensor (third embodiment, FIG. 7) 31 sensor base 32 sensor body 33 detection element 40 structure abnormality detection flat sensor (fourth embodiment, FIG. 8) 41 sensor base part 42 sensor body 43 detecting element 50 planar sensor for detecting structural abnormality (fifth embodiment, FIG. 9) 51 sensor Part 52 Sensor main body 53 Detecting element H Slight height at which the sensor main body 6 protrudes from the surface of the sensor base 5 in the sensor groove 7 D Displacement amount of the structural member 11 with respect to the support member C Pressure increase / decrease amount θ Displacement Direction (rotation angle from reference position)

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Claims (5)

(57) [Claims] 1. A planar sensor base which is formed of a strength member and which can be disposed between a support member of a structure and a structural material; A planar sensor for detecting an abnormality of a structure, comprising: a sensor main body provided to detect a relative change with respect to a structural material. 2. The planar sensor for detecting an abnormality in a structure according to claim 1, wherein the sensor main body has detection elements arranged concentrically on the sensor base. 3. The planar sensor according to claim 1, wherein the sensor body has detection elements arranged in a matrix on the sensor base. 4. The planar sensor according to claim 1, wherein the sensor body has detection elements radially arranged on the sensor base. 5. The planar sensor according to claim 1, wherein the sensor main body has a detection element arranged in a spiral shape on the sensor base.