CN112833768A

CN112833768A - Bridge monitoring system based on Beidou satellite and arrangement method thereof

Info

Publication number: CN112833768A
Application number: CN201911169276.1A
Authority: CN
Inventors: 姚金城
Original assignee: Beidou Guotie Wuhan Intelligent Technology Co ltd
Current assignee: Beidou Guotie Wuhan Intelligent Technology Co ltd
Priority date: 2019-11-25
Filing date: 2019-11-25
Publication date: 2021-05-25

Abstract

The invention relates to the field of bridge detection, and discloses a bridge monitoring system based on Beidou satellites and an arrangement method thereof. The invention has the following advantages and effects: according to the method, the three-dimensional positioning data of the bridge deck monitoring points of the railway bridge are acquired through the signals of the Beidou satellite, the three-dimensional positioning data are calibrated by means of mutual ranging between the Beidou GNSS base stations, and finally the acquired three-dimensional positioning data are summarized through the data processing system to obtain the deformation condition of the railway bridge, so that the deformation condition of the bridge can be continuously monitored, early warning can be given at the early stage of bridge damage, and the risk of bridge collapse is greatly avoided.

Description

Bridge monitoring system based on Beidou satellite and arrangement method thereof

Technical Field

The invention relates to the field of bridge monitoring, in particular to a bridge monitoring system based on a Beidou satellite and an arrangement method thereof.

Background

According to statistics, the quantity and difficulty of bridges built in China are already at the top of the world; in 2019, nearly 20 thousands of railway bridges exist in China, and in 2016, 9 seats of extra-large railway bridges are finished. Relevant statistics show that from 2007 to 2012, 37 bridges collapse in China, and more than 6 'life-taking bridges' are used on average every year, so that 180 people are lost. Among the collapsed bridges, almost six years are established after 1994, and the bridge age is less than 20 years. For example, 6 months 2012, the dam river in western ampere was flooded, 5 piers of the seawall dam bridge were collapsed successively, and 6-hole beams fell into the river; in 8 months in 2010, bridges from Deyang to Guanghan stone pavilion river of the Baocheng railway are broken by flood, and a train from Xian to Kunming falls into the stone pavilion river from the 15 th and 16 th carriages of K165 trains. The post-accident analysis shows that the real-time health monitoring of large-scale railway bridges and tunnels is very important in the face of sudden natural disasters.

Mainly lean on the manpower to carry range finding equipment regularly to detect the bridge among the prior art, but this kind of detection mode is wasted time and energy, and the time interval is big, is difficult to in time discover the bridge problem.

Patent publication No. CN106767664B provides a big span bridge deformation real-time supervision method based on beidou system, and this kind of method is more provides the processing mode of a detection data, does not mention directly carrying on bridge detecting system's equipment, locating position, how to detect etc. and is difficult to directly apply to bridge detection.

Disclosure of Invention

The invention aims to provide a bridge monitoring system based on a Beidou satellite and an arrangement method thereof, and the bridge monitoring system has the effects of long-acting detection, real-time inquiry and crisis early warning.

The technical purpose of the invention is realized by the following technical scheme: .

A bridge monitoring system based on Beidou satellites comprises a plurality of Beidou GNSS base stations and a data processing system, wherein each Beidou GNSS base station comprises a Beidou GNSS monitoring station arranged on a bridge and a Beidou GNSS reference station arranged outside the bridge, the number of the Beidou GNSS monitoring stations is not less than three, and the number of the Beidou GNSS reference stations is not less than one; the Beidou GNSS base station comprises a power supply module, a measurement module and a communication module, wherein the measurement module is used for receiving information provided by the Beidou foundation enhancement system, the communication module is used for transmitting data detected by the communication module back to the data processing system, and the power supply module provides required electric power;

and software of the data processing system receives original observation data of the Beidou GNSS reference station and the Beidou GNSS monitoring station, and performs data processing to obtain instantaneous centimeter-level dynamic real-time position change and millimeter-level creep.

As a further improvement of the invention, the measurement module further comprises a UWB communication module, the UWB communication module is used for measuring the distance between any two Beidou GNSS base stations and measuring the distance between the Beidou GNSS bridge monitoring station and the Beidou GNSS bridge reference station, and the measured and calculated data are transmitted to the data processing system.

As a further improvement of the present invention, the power supply module supplies power to either solar power or power grid.

As a further improvement of the present invention, the signal transceiver module is any one of WIFI, 4G, 5G or optical fiber.

Also provided is a deployment method using the beidou satellite-based bridge monitoring system of any one of claims 1 to 4, characterized by comprising the steps of:

s1, at least one Beidou GNSS reference station is arranged outside a bridge;

s2, at least three Beidou GNSS monitoring stations are arranged in the bridge, and according to different types of bridges, the following arrangement method is adopted,

1) arrangement mode of common beam type bridge Beidou GNSS monitoring station

Combining geological topography under a bridge and traffic conditions in the process of laying control points; for a common beam bridge, a Beidou GNSS monitoring station is arranged on a girder L/2 section and a bridge abutment with hidden danger, and high pier measuring points are properly added in multiple spans; the multi-span bridge can properly reduce the number of the measuring points according to the symmetry principle and is arranged in a span-spaced manner;

2) arrangement mode of continuous rigid frame bridge Beidou GNSS monitoring station

Combining geological topography under a bridge and traffic conditions in the process of laying control points; the Beidou GNSS monitoring station is arranged at a main span L/4, a main span with the largest deflection 3L/4, a side span with the largest deflection point, a bridge pier and a bridge abutment with hidden danger;

3) arrangement mode of arch bridge Beidou GNSS monitoring station

The layout rules of the hollow stone arch bridge, the double-arch bridge, the box arch bridge, the rib arch, the rigid frame arch and the truss arch bridge Beidou GNSS monitoring station are as follows: for the middle bridge, a Beidou GNSS monitoring station is arranged at an L/2 (vault); for the bridge, the Beidou GNSS monitoring stations are arranged at L/4, L/2 (vault) and 3L/4; for the grand bridge, the Beidou GNSS monitoring stations are arranged at L/4, 3L/8, L/2 (vault), 5L/8 and 3L/4; measuring points are also arranged on the abutments with potential safety hazards;

4) arrangement mode of suspension bridge Beidou GNSS monitoring station

The Beidou GNSS monitoring stations are arranged at the top of the main tower, main span main beams L/4, L/2, 3L/4 and 4 anchorages;

5) cable-stayed bridge Beidou GNSS monitoring station arrangement mode

The Beidou GNSS monitoring station is arranged at the top of the main tower, main span main beams L/4, L/2 and 3L/4 and a pier with potential safety hazards;

6) the rest kinds of bridges are randomly arranged.

As a further improvement of the present invention, the arrangement position of the beidou GNSS reference station in step S1 should satisfy all of the following conditions:

1) the station should be selected in a place which is solid and stable in foundation, easy to store for a long time and beneficial to safe operation, and has annual average sinking and displacement less than 3 mm;

2) the reference point is buried and measured outside the deformation influence range, and the distance between the reference station and the monitoring body is preferably 1-3 kilometers;

3) the distance between the site and the surrounding high-power radio emission source (such as a television station, a radio station, a microwave station, a communication base station, a substation and the like) is more than 200 m; the distance between the microwave transmission line and the microwave channel is more than 100 m;

4) objects which strongly interfere with receiving satellite signals, such as large buildings, glass curtain walls, large-area water areas and the like, are not needed near the station site;

5) accumulation of barrier shielding angles with height angles larger than 10 degrees in a station site view field should not exceed 30 degrees;

6) sites should avoid areas of geological instability such as: a fault fracture zone, a place (such as a mining area, an oil and gas mining area, an underground water funnel settlement area and the like) where local deformation such as landslide and subsidence easily occurs, and a place where underground water level changes greatly;

7) the station site should be able to conveniently erect commercial power lines or have reliable power supply; and should facilitate access to public or private communication networks;

8) after the station address is selected, a field intensity meter is used for field intensity test on the spot, and the noise field intensity on the central frequency points of L1 and L2 is preferably lower than-180 db/mv and-160 db/mv respectively. And the GNSS station building condition test and data analysis should be continuously carried out for 24 hours, wherein the data efficiency rate should be higher than 90%, the multipath influence MP1 is less than 0.35, and the MP2 is less than 0.4.

The invention has the beneficial effects that: according to the method, the three-dimensional positioning data of the bridge deck monitoring points of the railway bridge are acquired through the signals of the Beidou satellite, the three-dimensional positioning data are calibrated by means of mutual ranging between the Beidou GNSS base stations, and finally the acquired three-dimensional positioning data are summarized through the data processing system to obtain the deformation condition of the railway bridge, so that the deformation condition of the bridge can be continuously monitored, early warning can be given at the early stage of bridge damage, and the risk of bridge collapse is greatly avoided.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is an elevation view of an approach bridge monitoring point.

Fig. 2 is a plan view of the upper approach bridge monitoring point.

Fig. 3 is an elevation view of a cable-stayed bridge monitoring point.

Fig. 4 is a plan view of a cable-stayed bridge monitoring point.

FIG. 5 is an elevation view of a monitoring point of the lower approach bridge

FIG. 6 is a plan view of a monitoring point of the lower approach bridge

Detailed Description

The technical solution of the present invention will be clearly and completely described below with reference to specific embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.

In this embodiment, a typical large-span cable-stayed bridge is used for illustration, and the bridge in this embodiment is divided into an upper approach bridge, a main bridge and a lower approach bridge.

Go up the bridge approach monitoring range and arrange from pier No. 1 to pier No. 4 across the footpath: 4 x 40m simple T-shaped beams are arranged, 4 sections and 5 measuring points in total are arranged, and the measuring points are shown in figures 1 and 2. 1 measuring point is respectively arranged at the tops of No. 01, No. 02 and No. 04 piers and distributed at the upstream, and the transverse settlement deformation of the piers is monitored; total 3 points, which are static observation points. 1 cross section is arranged in 50m span of No. 01 and No. 02, monitoring points are symmetrically distributed, and deformation of a main beam is monitored, wherein the number of the monitoring points is 2; are static observation points.

The monitoring range of the main bridge is No. 0-5 main piers, and 24 sections and 46 measuring points are arranged in total, as shown in figures 3 and 4.

Arranging 1 measuring point at the top of each main tower, and monitoring the space displacement of the top of the tower; 2 points of the full bridge are dynamic measuring points; 2 measuring points are respectively arranged at the tops of the side piers and the auxiliary piers, and the number of the measuring points is 1 respectively at the upstream and downstream, so that foundation settlement is monitored; 8 points of the full bridge are static measuring points; the side span monitoring cross section, the upper reaches of which are respectively provided with 1 dynamic measuring point; 2 full bridges are provided; monitoring quartering point sections of the secondary main span, wherein 2 measuring points are arranged on each section, and the deformation of the main beam is monitored at each of the upstream and downstream; the total number of the full bridge is 12 points which are dynamic measuring points; monitoring 12-point sections of the main span, wherein 2 measuring points are arranged on each section, and the deformation of the main beam is monitored at the upstream and downstream of each section by 1; the full bridge has 22 points, which are dynamic measuring points.

The bridge approach monitoring range is from pier No. 6 to pier No. 15, and the span is arranged as: 9X 50m simple T-shaped beams are arranged, 6 sections are arranged, and 9 measuring points are arranged in total, as shown in figures 5 and 6.

7. 2 measuring points (1 is respectively arranged at the upstream and the downstream) are arranged at the top of the No. 9 pier, and the transverse settlement deformation of the pier is monitored; 4 points in total are static observation points; 6. 1 measuring point (upstream arrangement) is respectively arranged at the tops of No. 8 and No. 15 piers, and the settlement deformation of the piers is monitored; 3 points in total are static observation points; 1 section is arranged in each span of 8-9 spans (50 m spans), and the deformation of the main beam is monitored, wherein the total number of the sections is 2; are static observation points.

A Beidou GNSS reference station is arranged on a high building with 10 floors of height at one end of the bridge, and another Beidou GNSS reference station is arranged on a high building with 12 floors of height at the other end of the bridge.

The Beidou GNSS monitoring station is installed on the special support, and the installation height and the specific position are determined according to the field environment.

The test point placement is collectively as follows:

monitoring point summary table of large-span cable-stayed bridge

Claims

1. The utility model provides a bridge monitoring system based on big dipper satellite which characterized in that: the Beidou GNSS monitoring system comprises a plurality of Beidou GNSS base stations and a data processing system, wherein each Beidou GNSS base station comprises a Beidou GNSS monitoring station arranged on a bridge and a Beidou GNSS reference station arranged outside the bridge, the number of the Beidou GNSS monitoring stations is not less than three, and the number of the Beidou GNSS reference stations is not less than one; the Beidou GNSS base station comprises a power supply module, a measurement module and a communication module, wherein the measurement module is used for receiving information provided by the Beidou foundation enhancement system, the communication module is used for transmitting data detected by the communication module back to the data processing system, and the power supply module provides required electric power;

the data processing system comprises an original data processing module, a secondary data processing module, a database and an inquiry module, wherein the original data processing module is used for receiving original observation data of a Beidou GNSS reference station and a Beidou GNSS monitoring station, processing the data to obtain instantaneous centimeter-level dynamic real-time position change and millimeter-level creep, and sending the position change and the millimeter-level creep into the database; the secondary data processing module can retrieve data from the database, and perform calculation processing to form a report; the query module can issue command query information; the database is used for storing information.

2. The Beidou satellite based bridge monitoring system of claim 1, characterized in that: the measuring module further comprises a UWB communication module, the UWB communication module is used for measuring the distance between any two Beidou GNSS base stations and measuring the distance between a Beidou GNSS bridge monitoring station and a Beidou GNSS bridge reference station, and measured and calculated data are transmitted to the data processing system.

3. The Beidou satellite based bridge monitoring system of claim 2, characterized in that: the power supply module supplies power to solar energy or a power grid.

4. The Beidou satellite based bridge monitoring system of claim 3, characterized in that: the signal transceiver module is any one of WIFI, 4G, 5G or optical fiber.

5. An arrangement method of the bridge monitoring system based on the Beidou satellite according to any one of claims 1 to 4, characterized by comprising the following steps: