JP2011122824A - Bridge deterioration monitoring and recording device and bridge deterioration monitoring and recording system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein the investigation cost of the bridge strength of a road bridge or a railroad bridge becomes bulky and the strength (life) of the bridge can not be accurately estimated. <P>SOLUTION: A light sending device, which emits a sharp laser beam controlled in emission time by a control circuit for the purpose of monitoring and recording the variation quantity of the member of the road bridge or the like, is fixed to an object to be monitored; the laser beam is detected by a light detector fixed at a stable place; a row of light detection elements for detecting the laser beam is provided to the light detector to supply the signal outputs of the light detection elements irradiated with the laser beam to a recorder; the surface of which is discolored by an amplified current, through a recording needle; and the displacement quantity of the object to be monitored is monitored and recorded. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention provides a direct view of the deterioration of a bridge by periodically monitoring and recording (memorizing) the direction and amplitude of vibrations that occur when trucks / railways pass through bridges such as railway bridges and road bridges. The present invention relates to a bridge deterioration monitoring and recording device that can be monitored and quantitatively evaluated.

The strength (lifetime) of a road bridge, one of the bridges that has withstood the use for many years, was diagnosed by sequentially investigating those that have passed 50 years with reference to the construction year of the road bridge. As a conventional method, a visual inspection by an expert of a specialized company has been mainly used. In this visual inspection, a crane or the like was used, which was a large-scale work. As another method, accelerometers and strain gauges are installed in many places on the road bridge, and a lot of data is taken from these multiple measuring instruments, and the experts (specialized companies) analyze and predict them for repair. The time and replacement time were decided.
It is necessary to omit the work using these large-scale devices and analysis predictions that must be requested from specialists and professional companies, and simply monitor and record the bridge.

FIG. 5 is a diagram illustrating a configuration example of Patent Document 1 of the prior art.
In Patent Document 1, M, which is a non-contact type vibration / displacement measuring device, includes a lens unit 11 for aiming at a measurement target region, an irradiation unit 12 for irradiating the measurement target region with laser light, and reflection of the laser light. An optical system 15 including a light receiving unit 13 that receives light, a drive unit 20 that drives the optical system 15, and control information of the drive unit 20 when the lens unit 11 is aimed at the measurement target region is stored. Irradiating the laser beam to the storage unit 25, the aiming position defining unit that determines the aim of the laser beam emitted from the irradiation unit 12 based on the control information of the driving unit 20, and the aiming determined by the aiming position defining unit, A detection unit that detects a change in the output of reflected light caused by vibration or displacement of the measurement target region, and a vibration analysis unit 30 that analyzes the displacement state or vibration state of the measurement target region based on the change in output of the reflected light. This By, thereby achieving the simplification of using a laser Doppler measurements.

  Further, in Patent Document 2, when a laser Doppler is used in a non-contact measurement system for vibration characteristics of a structure, how to set a surface that a laser reflects when a high part such as a bridge is a measurement target surface. In order to solve the problem, a non-contact measurement target surface is formed by landing a paint bullet and attaching a retroreflective coating to a non-contact measurement device for vibration characteristics of a structure using laser light. Non-contact measurement target surfaces can be quickly and accurately formed on places where retroreflective seals that have been used as reflective targets, such as river bridges and high places, cannot be easily applied. To improve efficiency and safety. Furthermore, since the laser light emitted from the U Doppler device, which is a new system capable of non-contact measurement of structural vibration over a long distance, is retroreflected, the retroreflected laser light can be accurately reflected by the U Doppler device. It can detect and perform accurate non-contact measurement.

JP 2007-309899 A JP 2008-281422 A

  However, the conventional method has a problem that the cost of investigating the strength of the road bridge becomes enormous and the strength (lifetime) of the road bridge cannot be accurately predicted. There were also major problems related to human life, such as missed road bridges due to financial difficulties, repair work being delayed, and replacement work not being possible.

  A light transmission device that emits a sharp light beam whose light emission time is controlled by a control circuit for the purpose of monitoring and recording the amount of variation in road bridge members, etc. is fixed to the monitored object, and the light beam is fixed in a stable location. A recording body whose surface is discolored by an electric current obtained by amplifying the signal output of the light receiving element irradiated with the light beam is provided in the light receiving apparatus. It is characterized by being supplied through a recording needle and monitoring and recording the amount of displacement of the monitored object.

  In addition, the installation location can be changed so that the light receiving device is fixed to an object to be monitored and the light transmission device is installed at a fixed location.

  Furthermore, it is possible to use it in a place where a storage battery (battery) is mounted or placed separately and AC100V power is not supplied.

  Furthermore, a wireless LAN card is mounted, and a wireless communication function is provided so that collected data can be transmitted wirelessly.

  Using this automatic monitoring system for deterioration of road bridges, the vibration direction and amplitude data of several points on the road bridge are collected regularly every year, and the degree of change over time of the data is confirmed directly. The degree of deterioration of the road bridge can be determined by analysis.

The figure explaining the structure of the light transmission part of this invention. The figure explaining the structure of the light receiving part of this invention. The figure explaining the path | route which obtains the light beam radiated | emitted from the light transmission part as an electrical signal in a light-receiving part. The figure which shows an example of a displacement amount. The figure which shows an example of a prior art.

FIG. 1 shows a main part of a light transmitting device including the present invention.
1-1 is a monitored object such as a bridge member that is displaced by vibration, 1-2 is a light emitter, and light emission is performed as described later by a light emission control circuit shown in 1-3. The pause time, start time, and time for supplying power necessary for light emission are controlled.

1-4 is a condenser that converges the light beam 1-5 of the light emitter 1-2 and emits a light beam 1-5 directed to the light receiving device shown in FIG.
The output 1-6 of the light emission control circuit sends out a signal for automatically operating the light receiving device (FIG. 2) described later.

FIG. 2 shows a light receiving device that receives a light beam 1-5 emitted from the light transmitting device shown in FIG. 1 by a light receiving element array 2-4 accommodated in a container 2-2 of the light receiving device.
The interior of the light receiving element container 2-2 is subjected to antireflection processing 2-3 so that light other than the light beam 1-5 does not enter the light receiving element row 2-4.
In the light receiving element column 2-4, for example, photodiodes are arranged at intervals such that changes in the displacement amount can be distinguished (recognized). Will be explained.

  The signal output 2-5 amplifies the output current of the photodiode and supplies it to the recording needle row 4-1 shown in the description of the recording of the displacement amount (FIG. 4) by the recording signal cable 2-6.

FIG. 3 shows a path for obtaining an electrical signal from the light beam 1-5.
The signal output 2-5 of the column 2-4 of the light receiving elements is supplied to the column 3-3 of the amplifier circuit, amplified, and passed through the recording signal cable 2-6 as a column 3-7 of the recording electric signal. This is supplied to the recording needle row 4-1.
In this embodiment, the recording surface 3-8 is recording paper.
The surface of the recording substrate 3-5 is attached with a substance that changes color when a current is applied to the surface of the recording surface 3-8, and forms a color-change image at a position where the light beam 1-5 is received as will be described later.
Reference numeral 3-2 denotes a power source of the light receiving element for supplying power necessary for the light receiving element column 2-4 to convert the light beam 1-5 into an electric signal to the light receiving element column 2-4.
Reference numeral 3-4 amplifies the signal output 2-5 outputted from the row of the light receiving elements, and a row 3-6 of recording needles arranged so as to come into contact with the recording surface 3-8, and a signal output 2- 5 is a recording power supply for supplying necessary power to the column 3-3 of the amplifier circuit to which 5 is supplied.

FIG. 4 shows a displacement amount recording example 4-4 and a recording surface feed direction 4-3. The recording surface 3-8 is discolored by the current in the recording electrical signal train 3-7 transmitted from the recording signal cable 2-6 to the recording needle train 4-1. On the recording surface 3-8, a displacement scale 4-2, a time mark 4-6 for starting recording of the light beam 1-5, and a recording pause mark 4-7 are drawn according to the control signal of the light emission control circuit 1-3. To do.
The recording surface 3-8 is advanced in the recording surface feed direction indicated by an arrow (←-).
With the above operation, the displacement amount of the light beam 1-5 as illustrated in the displacement amount recording example 4-4 is recorded.

  The recording surface 3-8 is an example of recording paper, but by changing (improving) the configuration of 3-5 to 3-8 in FIG. 3, a cathode ray tube (CRT: Cathode Ray Tube, CRT), liquid crystal display It is also possible to use a general display such as (LCD: Liquid Crystal Display).

  In this embodiment, when the direction of monitoring and recording is changed, the set angle of the light receiving device may be installed so as to match the planned (predicted) direction of displacement of the light beam.

  Further, in this embodiment, in order to improve the monitoring and recording density, a sharper light beam may be used to reduce the interval between the arrangement of the light receiving elements in the row of light receiving elements.

Claims (5)

  A light transmission device that emits a sharp light beam whose light emission time is controlled by a control circuit for the purpose of monitoring and recording the amount of variation in road bridge members, etc. is fixed to the monitored object, and the light beam is fixed in a stable location. A recording body whose surface is discolored by an electric current obtained by amplifying the signal output of the light receiving element irradiated with the light beam is provided in the light receiving apparatus. A bridge deterioration monitoring and recording device, which is supplied through a recording needle and monitors and records the amount of displacement of the monitored object.   2. The bridge deterioration monitoring recording apparatus according to claim 1, wherein the light receiving device is fixed to an object to be monitored, and the installation location can be changed so that the light transmission device is installed at a fixed location.   The bridge deterioration monitoring and recording apparatus according to claim 1, wherein the bridge deterioration monitoring and recording apparatus according to claim 1, wherein the bridge deterioration monitoring and recording apparatus can be used even in a place where AC 100 V power is not supplied by mounting or separately installing a storage battery (battery).   The bridge deterioration monitoring and recording apparatus according to any one of claims 1 to 3, wherein a wireless LAN card is mounted and the collection data can be transmitted wirelessly with a wireless communication function.   A bridge deterioration monitoring and recording system and a bridge deterioration monitoring and recording system capable of receiving a plurality of collected data wirelessly transmitted from a monitored recording device of a monitored object at a remote location, displaying the collected data in an aggregated manner, and performing centralized monitoring.