JP3136442B2 - Bridge abnormality detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting an abnormality in a structure, and more particularly, to a fracture of a member caused by fatigue of a structure such as a bridge, a steel tower, other buildings, and construction machines.
The present invention relates to an abnormality detection device for a structure for detecting an abnormality when an earthquake, a typhoon, a flood, or any other large external force may act on the abnormality.

[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.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been described in view of the above-mentioned problems. It is an object of the present invention to provide a structural abnormality detection device capable of detecting a deviation from an installation state when it has been installed, a direction of the deviation, a change in pressure or stress, and the like.

It is another object of the present invention to provide a structural abnormality detecting device capable of detecting a deviation or the like from a support member in a plane of the structure and grasping the state of the deviation.

It is another object of the present invention to provide a structural abnormality detection device capable of detecting a change in the magnitude or distribution of a pressure, a reaction force, or a stress in a vertical direction applied to a support portion of the structure.

Further, the present invention provides a method for controlling the displacement of a structure in a plane and in a vertical direction, the magnitude of a pressure, a reaction force or a stress, and a distribution shape exceeding a predetermined set value (threshold). It is an object of the present invention to provide a structural abnormality detection device capable of displaying a warning or outputting a warning.

[0008]

That is, the present invention focuses on interposing a flat sensor between a support member of a structure and a structural member supported by the support member. A flat sensor provided between the supporting member and the structural material, and control means capable of detecting an abnormality of the structure by a change from a steady state of the structural material detected by the flat sensor. This is a structural abnormality detection device.

[0009] The flat sensor can detect a relative displacement of the support member and the structural member in a plane, or a change in a reaction force or a stress.

The control means can output the change when the change exceeds a threshold value.

As the above-mentioned plane sensor, any other structure can be adopted as long as it can detect a planar deviation and a pressure change amount, in addition to a matrix sensor.

In the structure abnormality detecting apparatus according to the present invention, since the planar sensor is provided between the structural support member and the structural member, the stationary state of the upper structural member supported by the structural support member is maintained. An abnormality in the structure can be detected by a change from the state (the state of construction after normal operation). Therefore, it is possible to detect changes from the time when the construction of the structure was functioning normally, and if the structure is displaced due to a member breakage due to fatigue or an external force at the time of abnormality such as earthquake, typhoon, flood, etc. It is possible to accurately grasp and determine whether more detailed inspection is required, whether full repair is necessary, or whether use is stopped and use is stopped.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a structural abnormality detecting apparatus 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4, taking a bridge as an example. FIG. 1 is a perspective view of a bridge 2 (structure) equipped with a structural abnormality detection device 1 according to the present invention. The bridge 2 includes a support member 3 and an upper structural member supported by the support member 3. And 4.

The abnormality detection device 1 has a flat sensor 5, a sensor driver 6, and a control circuit 7 (control means).

FIG. 2 is an enlarged side view of a main part of the support member 3 in the bridge 2, wherein a flat sensor 5 is provided between the support member 3 and the structural member 4. That is, the support top 3A of the support member 3 is arranged at a substantially central position of the flat sensor 5.

FIG. 3 is a plan view of a portion of the flat sensor 5. The flat sensor 5 has a plurality of detection elements 8 in a matrix shape having a planar spread in the plane.
Is arranged. Therefore, it is possible to detect a relative displacement of the structural member 4 in the plane with respect to the support member 3.

FIG. 4 is a graph showing a pressure distribution between the support member 3 and the structural member 4 detected by the flat sensor 5, and shows a distribution in a steady state (solid line in the figure). A distribution in a state shifted from the top 3A) (a dotted line in the figure) and a distribution in a state where the pressure is increased in the support top 3A (a dashed line in the figure) are shown.

In the abnormality detection device 1 having such a configuration,
If the relative position between the support member 3 and the structural member 4 changes during an earthquake or other abnormality, or if the load from the structural member 4 to the support member 3 changes, as shown in FIG. Can be detected. Of course, as shown in FIG. 3, since the flat sensor 5 can detect a change in the plane, the direction of displacement can also be detected, for example, as the rotation angle θ from the reference position.

That is, the change in the detected amount, the displacement amount D, the pressure increase / decrease amount C, the rotation angle θ, etc.,
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 7 outputs this and calls attention to the outside as a predetermined alarm display or an alarm sound. be able to.

[0021]

As described above, according to the present invention, since a plane sensor is interposed between the support material of a structure such as a bridge and the structural material, a change in displacement or pressure is detected. Detects abnormal conditions that occur during an earthquake or other abnormality, and enables appropriate measures to be taken thereafter.

[Brief description of the drawings]

FIG. 1 is a perspective view of a bridge 2 (structure) equipped with a structure abnormality detection device 1 according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of a main part of a support member 3 in the bridge 2;

FIG. 3 is a plan view of the same flat sensor 5;

FIG. 4 shows a support member 3 detected by a flat sensor 5
6 is a graph showing a pressure distribution between the first and second structural members 4.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure abnormality detection apparatus (embodiment, FIG. 1) 2 Bridge (structure) 3 Support material of bridge 2 3A Support top of support material 4 Structural material of bridge 2 5 Planar sensor 6 Sensor driver 7 Control circuit ( Control means) 8 Detecting element of plane sensor 5 D Displacement amount of structural material 4 with respect to support material 3 Pressure change amount θ Direction of displacement (rotation angle from reference position)

Continuation of the front page (56) References JP-A-56-29777 (JP, A) JP-A-61-122513 (JP, A) JP-A-7-218214 (JP, A) JP-A-61-10734 (JP) JP-A-4-132928 (JP, A) JP-A-10-274523 (JP, A) JP-A-50-133155 (JP, U) JP-A-1-67508 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) G01M 19/00-19/02 G01B 21/32 JICST file (JOIS)

Claims (3)

(57) [Claims] 1. A construction state in which the bridge is functioning properly between the support top of the bridge support and the structural material of the bridge.
In the steady state, and the support top
Planar detection element for detecting the pressure between said structural member and
A planar sensor arranged with a broadening, abnormality of bridges and having a a detectable control means abnormal in the plane of the bridge by a change from the steady state of the bridge detected by the plane sensor Detection device. 2. The bridge according to claim 1, wherein the plane sensor is capable of detecting a relative displacement in the plane between the support member and the structural member, or a change in a reaction force or a stress. Anomaly detection device. 3. The bridge abnormality detecting device according to claim 1, wherein said control means is capable of outputting the change when the change exceeds a threshold value.