CN101315274A - A monitoring device and real-time monitoring method for bridge vibration deformation - Google Patents

Abstract

The invention discloses a bridge vibration deformation monitoring device and a real-time monitoring method, including a laser emitter, a synchronous light receiving and transmitting device at multiple monitoring points, a centralized control and communication device, a remote monitoring center and the like. When the emitted beam of the laser irradiates the reflective and transmissive prism in the synchronous light receiving and transmitting device, it will split the light in proportion, part of which is reflected and received; part of it is transmitted and transmitted to the reflection of the next measuring point synchronous light receiving and transmitting device on a transmission prism. Each synchronous light receiving and transmitting device can collect, store and upload data on the deformation amount (spot displacement amount) of the measuring point. The monitoring system performs synchronous acquisition and data processing of the deformation of all measuring points, so that the measurement of the vibration deformation of the entire bridge can be realized. The invention can be used for deformation and low-frequency vibration measurement of various large bridge buildings, and has the characteristics of fast, real-time, high measurement accuracy and real-time monitoring.

Description

A monitoring device and real-time monitoring method for bridge vibration deformation

technical field

The invention relates to a measuring device and a measuring method, in particular to a monitoring device and a real-time monitoring method for vibration deformation of a large bridge.

Background technique

At present, there are relatively few devices and methods related to real-time vibration and deformation monitoring of bridges in China, and the existing measurement methods are too complicated and the measurement accuracy is not high, or the measurement methods are simple, and the deformation of the bridge cannot be accurately measured. Accurate real-time collection will bring inconvenience to the bridge monitoring personnel to judge the deformation and safety of the bridge.

Contents of the invention

The invention aims to solve the above-mentioned deficiencies existing in the existing bridge vibration deformation monitoring method, and improve the safety of the bridge in use. Provided are a high-precision, real-time monitoring device and method for bridge vibration and deformation based on the principle of laser imaging.

To achieve the above object, the present invention is achieved by taking the following technical solutions:

A monitoring device for vibration and deformation of a bridge, comprising a laser emitter arranged at one end of the bridge or at any position in the direction of the bridge length, or two laser emitters respectively arranged at both ends of the bridge, characterized in that the laser emitter emits light beams There are multiple monitoring points on the bridge extending in a straight line, and a set of synchronous optical receiving and transmitting devices are installed on each monitoring point; each synchronous optical receiving and transmitting device is connected to a field bus through its own signal line output. The bus is connected to the centralized control and communication device at the location of the laser transmitter, and the centralized control and communication device and a remote monitoring center realize the transmission of monitoring data of the synchronous light receiving and transmitting device through wireless or wired means.

In the above-mentioned device, the synchronous light receiving and transmitting device includes a reflection-transmission prism placed on the outgoing light beam, and an imaging screen, an optical amplifier, a photoelectric conversion and a data memory are arranged in a direction perpendicular to the reflected light of the reflection-transmission prism, and the photoelectric conversion And the data memory is connected to the field bus through the signal line.

A method for monitoring bridge vibration deformation in real time with the above monitoring device, comprising the following steps:

(1) First, install a laser emitter at one end of the bridge or at any position in the direction of the bridge length, or install two laser emitters at both ends of the bridge, and set multiple Monitoring points, each monitoring point is equipped with a set of synchronous optical receiving and transmitting devices, and the laser transmitter emits laser light to the first set of synchronous optical receiving and transmitting devices on the nearest monitoring point;

(2) The first set of synchronous light receiving and transmitting device splits the emitted light of the laser transmitter according to a certain ratio, part of which is reflected and received, imaged and collected and stored; part of it is transmitted and transmitted backwards; thereafter, each synchronous light receiving and transmitting device Carry out the same process to the outgoing light of the previous synchronous light receiving and transmitting device;

(3) The synchronous optical receiving and transmitting devices of each measuring point output the stored optical imaging data to a field bus through their respective signal lines, and then transmit them synchronously to the centralized control and communication device at the position of the laser transmitter through the field bus, Centralized control and communication devices are transmitted to the remote monitoring center through wireless or wired transmission.

In the above method, the first set of synchronous optical receiving and transmitting device described in step (2) splits the outgoing light of the laser transmitter according to a certain ratio. The reflection and transmission prism on the outgoing beam, the reflection and transmission prism splits the outgoing beam of the laser transmitter according to a certain ratio, a part of it is transmitted and transmitted to the subsequent synchronous light receiving and transmission device; a part is reflected to the imaging screen; forming a uniform The light spot is input to the photoelectric conversion and data memory through the optical amplifier. The photoelectric conversion and data memory set the light spot data collected initially as the reference point. When the bridge vibrates and deforms, the light spot will move on the imaging screen. Time-to-photoelectric conversion and data memory compare the collected light spot variation with the reference point, and accurately output the horizontal and vertical deformation of the bridge at the measuring point through the signal line connected to the field bus.

The synchronous light receiving and transmitting device described in the step (2) splits light according to a certain ratio and refers to: the reflectivity of the reflective transmission prism of the first set of synchronous light receiving and transmitting device is calculated by 10%, and each subsequent synchronous light receiving and transmitting device The reflectivity of the reflective and transmissive prism of the transmission device is increased by 5%, so that the number of measuring points meets the length and accuracy requirements of the bridge to be measured.

When the laser transmitter is installed at both ends of the bridge as described in step (1), the laser transmitter can shoot from the two ends of the bridge to the synchronous light receiving and transmitting device on each monitoring point in the middle of the bridge, and then press step (2) ~(3) to realize the real-time monitoring of vibration and deformation of long-span bridges.

Since the work of light receiving, transmission and emission of the measuring device of the present invention is continuous, not only can the timing collection of bridge deformation be carried out, but also high-precision real-time collection and monitoring of bridge vibration deformation can be carried out, and the deformation of the bridge can be understood more conveniently and quickly, so that The measurement is more accurate and safe, and the vibration mode of the bridge structure can be obtained. In this way, monitoring personnel can analyze various deformations of the bridge, make judgments and deal with abnormal changes of the bridge in advance, and provide a basis for optimal design.

In the measurement process, the present invention can realize the measurement requirements by increasing or decreasing the number of measurement points and the distance of the measurement points according to the different characteristics of the bridge itself, and can also adopt the method of two-end shooting for long-span bridges. Deformation measurement can also be measured in sections, and the measurement effect and accuracy will not be affected.

Description of drawings

Fig. 1 is the block diagram of the structural principle of the laser deformation measuring device of the present invention; Among the figure: 1, laser emitter; 2, outgoing light beam; 3, reflective transmission prism; 4, imaging screen; Memory; 7. Reflected beam of prism; 8. Transmitted beam of prism; 9. Synchronous light receiving and transmitting device; 10. Centralized control and communication device; 11. Remote monitoring center.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, firstly, the outgoing beam 2 is emitted by the laser transmitter 1 and passed through the beam expanding and collimating optical system to irradiate the reflective and transmissive prism 3 of the first set of synchronous light receiving and transmitting device 9, and is reflected by the prism according to a certain ratio. The light beam 7 is irradiated on the imaging screen 4 (the imaging screen can be a piece of frosted glass) to form a uniform spot, which is imaged on the photoelectric conversion and data memory 6 through the optical amplifier 5, and the photoelectric conversion and data storage store the light spot data collected initially. Set as the reference point, when the bridge deforms, the light spot will move on the frosted glass. At this time, the photoelectric conversion and data memory 6 will compare the collected light spot change with the reference point through the data processing software, and can accurately output and upload the bridge. The lateral (X direction) and vertical (settlement) deformation of the point.

During the measurement process, the transmitted light beam 8 passing through the reflective and transmissive prism 3 is then irradiated onto the reflective and transmissive prism of the synchronous light receiving and transmitting device at the next measuring point, and the deformation at this point of the bridge is calculated through the same imaging and acquisition method as before . According to this method, the deformation of each point to be measured of the bridge can be measured, so as to complete the deformation measurement of the whole bridge. The data of each measuring point is measured and stored synchronously through each synchronous light receiving and transmitting device, and transmitted to the centralized control and communication device 10 through the field bus, and transmitted to the remote monitoring center 11 through the remote communication system (wireless or wired). The vibration characteristics of the entire bridge can be analyzed according to the change of deformation with time. In this way, the real-time monitoring of deformation vibration of large bridge buildings can be realized.

The reflective transmissive prism 3 of synchronous light receiving and transmitting device reflects by a certain ratio: the reflectivity of the reflective transmissive prism of the first set of synchronous light receiving and transmitting device 9 is calculated by 10%, and each subsequent synchronous light receiving and transmitting device The reflectivity of the reflection-transmission prism increases by 5%, so that there are 18 measuring points. It is also possible to adjust the reflectivity of the first set of reflection-transmission prisms and the increment of reflectivity of the rear reflection-transmission prisms to meet the length and accuracy requirements of the bridge to be measured.

The remote monitoring center 11 can adopt a computer pre-installed with signal processing software. The optical amplifier can use f16, f25, f40, f50 and other lenses with different focal lengths according to the measurement range and accuracy.

When the laser transmitter is installed at both ends of the bridge, the laser transmitter can shoot from the two ends of the bridge to the middle of the bridge, and then realize the real-time monitoring of the vibration and deformation of the long-span bridge according to the above method. It can also be measured in sections, and the measurement effect and accuracy will not be affected.

Claims (6)

1. the monitoring device of a bridge vibration deformation, comprise a generating laser that is arranged on bridge one end or the arbitrary position of bridge length direction, or be separately positioned on two generating lasers at bridge two ends, it is characterized in that, the bridge that generating laser outgoing beam rectilinear direction is extended is provided with a plurality of monitoring points, a cover synchronizable optical all is set on each monitoring point receives and transfer device; Each synchronizable optical receives and transfer device is exported fieldbus of connection by signal wire separately, this fieldbus is connected to centralized control and the communication device that is in laser transmitter positions, and this centralized control and communication device and a remote monitoring center realize that by wireless or wired mode synchronizable optical receives and the transmission of transfer device Monitoring Data.

2, the monitoring device of bridge vibration deformation as claimed in claim 1, it is characterized in that, described synchronizable optical receives and transfer device comprises a reflection and transmission prism that is placed on the outgoing beam, be provided with imaging screen, optical amplifier and opto-electronic conversion and data-carrier store perpendicular to reflection and transmission prismatic reflection light direction, opto-electronic conversion and data-carrier store connect fieldbus by signal wire.

3, a kind of monitoring device method of real-time of using the bridge vibration deformation of claim 1 is characterized in that, comprises the steps:

(1) at first a generating laser is installed in an end or the arbitrary position of bridge length direction of bridge, or two generating lasers are installed respectively at the bridge two ends, the bridge that generating laser outgoing beam rectilinear direction is extended is provided with a plurality of monitoring points, one cover synchronizable optical all is set on each monitoring point receives and transfer device, generating laser receives and transfer device emission laser to the first cover synchronizable optical on its nearest monitoring point;

(2) first cover synchronizable optical receptions and transfer device carry out beam split by a certain percentage to the emergent light of generating laser, part reflection reception, imaging and collection storage; Part transmission is also transmitted backward; Thereafter each synchronizable optical reception and transfer device are handled equally to the synchronizable optical reception of front and the emergent light of transfer device;

(3) synchronizable optical of each measuring point receives and transfer device outputs to a fieldbus with the photoimaging data of the storage signal wire by separately, to centralized control that is in laser transmitter positions and communication device, centralized control and communication device arrive remote monitoring center by wireless or wire transmission through this fieldbus synchronous transmission.

4, as described in the claim 3 with the monitoring device method of real-time of the bridge vibration deformation of claim 1, it is characterized in that, the first cover synchronizable optical described in the step (2) receives and transfer device to the concrete grammar that the emergent light of generating laser carries out beam split by a certain percentage is: the first cover synchronizable optical receive and transfer device in adopt a reflection and transmission prism that is placed on the outgoing beam, this reflection and transmission prism carries out beam split with the outgoing beam of generating laser by a certain percentage, and a part of transmission and synchronizable optical sternward receive and the transfer device transmission; A part reflexes to imaging screen; Form a uniform hot spot, be input in opto-electronic conversion and the data-carrier store through optical amplifier again, its initial hot spot data of gathering of opto-electronic conversion and data-carrier store are set to reference point, when bridge generation vibration deformation, hot spot can be moved on imaging screen, at this moment opto-electronic conversion and data-carrier store compare hot spot variable quantity and the reference point that collects, by its accurate output bridge of signal wire that connects fieldbus at the horizontal and vertical deflection of this measuring point.

5, as described in the claim 3 with the monitoring device method of real-time of the bridge vibration deformation of claim 1, it is characterized in that, reception of synchronizable optical described in the step (2) and transfer device carry out beam split by a certain percentage and be meant: the reflectivity of the reflection and transmission prism of the first cover synchronizable optical reception and transfer device is by 10%, the reflectivity of each synchronizable optical reception thereafter and the reflection and transmission prism of transfer device increases progressively by 5%, makes the measuring point number satisfy length and the accuracy requirement that will measure bridge.

6, as described in the claim 3 with the monitoring device method of real-time of the bridge vibration deformation of claim 1, it is characterized in that, when at the two ends of bridge generating laser being installed described in the step (1), generating laser can receive and the transfer device correlation from the synchronizable optical of two ends on each monitoring point, bridge middle part of bridge, and the method for (2) then set by step～(3) realizes the bridge vibration of large span and the real-time monitoring of distortion.