CN108827158B - Laser monitoring device and method for main tower deviation of long-span bridge - Google Patents
Laser monitoring device and method for main tower deviation of long-span bridge Download PDFInfo
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- CN108827158B CN108827158B CN201810602314.7A CN201810602314A CN108827158B CN 108827158 B CN108827158 B CN 108827158B CN 201810602314 A CN201810602314 A CN 201810602314A CN 108827158 B CN108827158 B CN 108827158B
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- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
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Abstract
The invention discloses a laser monitoring device and method for deviation of a main tower of a long-span bridge, wherein the laser monitoring device for deviation of the main tower of the long-span bridge comprises an adjusting plate, a laser range finder and a cloud computing data processing server, the adjusting plate is arranged at the center line position of the top of the bridge tower, the plate surface of the adjusting plate is perpendicular to the side surface of the bridge tower, the laser range finder is arranged at the center line position of the bottom of the bridge tower, the included angle between the axis of the laser range finder and the plate surface is theta, the laser range finder is connected with a wireless data transmitter, and the cloud computing data processing server is used for receiving signals sent by the wireless data transmitter and computing the left and right offsets of the bridge tower according to the signals. According to the invention, the vertical displacement value measured by the laser range finder is converted into the transverse left-right offset displacement value of the bridge tower through the adjusting plate, and a precision coefficient can be provided for the measured value by adjusting the angle of the adjusting plate, so that the sensitivity and precision of measurement are improved.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a device and a method for monitoring deviation of a main tower of a long-span bridge by using laser.
Background
In recent years, large-span cable-stayed bridges and suspension bridges are increasingly emerging in traffic construction and are in a rapidly increasing situation, such as Wuhan parrot Changjiang bridges, Hangzhou expressway Beijing bridges and the like.
In the construction process of the large-span bridge, a large number of cables are used for bearing to increase the span, the cables are loaded on the bridge tower, and the stress of the whole bridge is transmitted to the bridge tower through the cables and then transmitted to the underground foundation by the bridge tower. Due to the fact that construction load is constantly changed and is affected by factors such as external wind load, the synchronous monitoring of the left deviation and the right deviation of the tower column of the cable system bridge and the construction is very important, and scientific basis is provided for construction quality and process control of a main cable, a stay cable and a beam body in the later period. At present, a method of manual periodic testing is generally adopted for bridge tower deviation monitoring of a bridge, namely monitoring points distributed on a tower column are observed by using a total station, the cost is high, the efficiency is low, and the scientificity of a measured result is greatly influenced by subjective factors of people; and a part of construction sites also adopt a GPS (global positioning system) to monitor the deviation of the main tower, but the GPS has high cost, and the transformation and data calculation of a coordinate system are very complicated and have low precision.
In view of this, it is urgently needed to improve the monitoring mode of the bridge tower in the existing large-span bridge, increase the measurement precision, improve the measurement efficiency and reduce the cost.
Disclosure of Invention
The invention aims to solve the technical problems of poor measurement precision, low measurement efficiency and high monitoring cost in the conventional bridge tower monitoring mode in the large-span bridge.
In order to solve the technical problem, the technical scheme adopted by the invention is to provide a laser monitoring device for the deviation of a main tower of a long-span bridge, which comprises:
the adjusting plate is arranged at the center line position of the top of the bridge tower, and the plate surface of the adjusting plate is vertical to the side surface of the bridge tower;
the laser range finder is arranged at the center line position of the bottom of the bridge tower, the included angle between the axis of the laser range finder and the plate surface is theta, and the laser range finder is connected with a wireless data transmitter;
and the cloud computing data processing server is used for receiving the signals sent by the wireless data transmitter and computing the left and right offset of the bridge tower according to the signals.
In the above scheme, the adjusting plate is made of a non-specular reflection material or a non-transparent material.
In the scheme, the length of the adjusting plate is 2/sin theta m.
In the above scheme, the laser range finder is connected with a solar power supply device.
In the above scheme, the range of the included angle θ between the plate surface and the vertical surface is as follows: 0< theta <45 deg..
The invention also provides a laser monitoring method for the deviation of the main tower of the long-span bridge, which comprises the following steps:
s1, respectively fixedly mounting an adjusting plate and a laser range finder on the side surfaces of the top and the bottom of the bridge tower, wherein the adjusting plate and the laser range finder are arranged on the same side and are both arranged at the center line position of the bridge tower;
s2, adjusting the laser range finder to enable the axis of the laser range finder to be parallel to the vertical central line of the side face of the bridge tower, adjusting the adjusting plate to enable the adjusting plate to be perpendicular to the side face of the bridge tower, and enabling the axis of the laser range finder and the plate face of the adjusting plate to form an included angle which is theta;
s3, connecting the laser range finder with the solar power supply device and the wireless data transmitter;
s4, arranging the cloud computing data processing server in a bridge construction building site command center, and receiving a signal sent by the wireless data transmitter through the cloud computing data processing server;
s5, the cloud computing data processing server receives a signal sent by the wireless data transmitter, and takes a static state of the bridge tower just after completion as a displacement balance point, at the moment, the initial distance L0 between the laser range finder and the adjusting plate is recorded, in the construction process, the laser range finder monitors the distance L between the laser range finder and the adjusting plate, and the cloud computing data processing server computes a displacement variable delta L, wherein the delta L is a difference value between L and L0;
s6, the cloud computing data processing server obtains the offset l of the bridge tower according to a displacement formula, wherein the displacement formula is as follows:
l＝ΔL×tanθ
s7, the cloud computing data processing server stores the current offset l and the warning values lmin and lmax of the offset l, the site constructor can inquire the current offset l at any time through a web browser, and when l is larger than lmax or l is smaller than lmin, the site constructor can perform early warning prompt on other operators in site construction through interphone channel broadcasting.
In the above scheme, the monitored sensitivity s is adjusted by changing the size of the included angle θ, and the calculation formula of the sensitivity s is as follows:
the value range of s is as follows: 0< s < 1.
In the above-described aspect, the included angle θ is 30 °.
Compared with the prior art, the invention converts the vertical displacement value measured by the laser range finder into the transverse left-right offset displacement value of the bridge tower through the adjusting plate, and can provide a precision coefficient for the measured value by adjusting the angle of the adjusting plate, thereby improving the sensitivity and precision of measurement.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a line graph illustrating the monitoring of a sample according to the present invention.
Detailed Description
The invention aims at the problems that the scientificity of the measurement result is greatly influenced by human subjectiveness, the GPS measurement cost is high, the conversion of a coordinate system and the data resolving are complicated and the like in the method for monitoring the deviation of the main tower by adopting manual periodic test or utilizing the GPS in the prior art, improves the bridge tower monitoring mode in the existing large-span bridge construction, increases the measurement precision, improves the measurement efficiency and reduces the cost. The invention is described in detail below with reference to the drawings and the detailed description.
As shown in fig. 1, the invention provides a laser monitoring device for main tower deviation of a long-span bridge, which comprises an adjusting plate 4, a laser range finder 5 and a cloud computing data processing server 8, wherein the adjusting plate is used for monitoring the offset of a bridge tower 3 in the construction process, and a beam body 2 and a bridge cable 1 are arranged on the bridge tower 3. The adjusting plate 4 is arranged at the center line position of the top of the bridge tower 3, and the plate surface of the adjusting plate is vertical to the side surface of the bridge tower 3.
Laser range finder 5 sets up the central line position in 3 bottoms on the bridge tower, and the axis of laser range finder 5 is theta with the contained angle of the face of regulating plate 4, and laser range finder 5 is connected with wireless data transmitter 7. Preferably, the included angle θ has a value range as follows: 0< theta <45 deg. has better measurement results.
The cloud computing data processing server 8 is used for receiving signals sent by the wireless data transmitter 7, and according to the invention, the left and right offset of the bridge tower 3 is computed according to the distance between the laser range finder 5 and the adjusting plate 4, the invention has the characteristics of rapid measurement and high monitoring precision, and the monitoring principle is as follows:
and taking the static state of the bridge tower 3 just after completion as a displacement balance point, receiving a signal sent by the wireless data transmitter 7 through the cloud computing data processing server 8, and recording the initial distance L0 between the laser range finder 5 and the adjusting plate 4, wherein the L0 is the dead distance between the laser range finder 5 and the adjusting plate 4 before construction.
In the construction process, the laser range finder 5 monitors the distance L between the laser range finder 5 and the adjusting plate 4, and the cloud computing data processing server 8 is used for computing a displacement variable delta L, wherein the delta L is the difference value between L and L0;
the cloud computing data processing server 8 obtains the current offset L of the bridge tower as a construction reference according to the computed displacement variable Δ L and through a displacement formula, and specifically, the displacement formula is as follows:
l＝ΔL×tanθ
the cloud computing data processing server 8 stores the current offset l and the warning values lmin and lmax of the offset l, field construction personnel can inquire the current offset l at any time through a web browser, and when l is larger than lmax or l is smaller than lmin, the field construction personnel can perform early warning prompt on other operation personnel in field construction through interphone channel broadcasting, adjust construction in time and change the posture of the bridge tower 3.
Preferably, the adjusting plate 4 is made of a non-specular reflection material and a non-transparent material, so that the laser energy emitted by the laser range finder 5 can be reflected diffusely, and the optimal length of the adjusting plate 4 is 2/sin θ m. In the deviation process of the bridge tower 3, the displacement of the adjusting plate 4 in the width direction is kept unchanged, the width of the adjusting plate 4 can be in a narrow range, the accurate receiving of the light path of the laser range finder 5 can be ensured, and the optimal width is 10-30 cm. The laser range finder 5 is connected with a solar power supply device 6.
The invention is applied to a certain suspension bridge, the main span of the suspension bridge is 430 meters, the main tower is in a door-shaped concrete structure with the height of 105 meters, the bridge is subjected to quality inspection after construction, the bridge is monitored by adopting the invention in the vehicle loading process, the monitoring data of the upstream deviation of the main tower on the main tower of the bridge is monitored by the invention, and the line graph of the change data is shown in figure 2.
Compared with the prior art, the invention has the following advantages:
(1) the laser range finder 5 is used as a sensing device and is arranged at the bottom of the bridge tower 3, so that the equipment cost is low, and the installation is simple and convenient;
(2) the vertical displacement value measured by the laser range finder 5 is skillfully converted into the transverse left-right offset displacement value of the bridge tower 3 through the adjusting plate 4, and a precision coefficient can be provided for the measured value by adjusting the angle of the adjusting plate 4, so that the sensitivity and precision of measurement are improved;
(3) a solar power supply device 6, a wireless data transmitter 7 and a cloud computing data processing server 8 are introduced, an intelligent monitoring and early warning system for bridge tower 3 deviation monitoring is established in the construction of a large-span bridge, and datamation and unmanned measurement and management are achieved.
The invention also provides a laser monitoring method for the deviation of the main tower of the long-span bridge, which is used for monitoring the left and right offsets of the bridge tower 3 in real time and comprises the following steps:
s1, respectively fixedly mounting an adjusting plate and a laser range finder on the side surfaces of the top and the bottom of the bridge tower, wherein the adjusting plate and the laser range finder are arranged on the same side and are both arranged at the center line position of the bridge tower;
s2, adjusting the laser range finder to enable the axis of the laser range finder to be parallel to the vertical central line of the side face of the bridge tower, adjusting the adjusting plate to enable the adjusting plate to be perpendicular to the side face of the bridge tower, and enabling the axis of the laser range finder and the plate face of the adjusting plate to form an included angle which is theta;
s3, connecting the laser range finder with the solar power supply device and the wireless data transmitter;
s4, arranging the cloud computing data processing server in a bridge construction building site command center, and receiving a signal sent by the wireless data transmitter through the cloud computing data processing server;
s5, the cloud computing data processing server receives a signal sent by the wireless data transmitter, and takes a static state of the bridge tower just after completion as a displacement balance point, at the moment, the initial distance L0 between the laser range finder and the adjusting plate is recorded, in the construction process, the laser range finder monitors the distance L between the laser range finder and the adjusting plate, and the cloud computing data processing server computes a displacement variable delta L, wherein the delta L is a difference value between L and L0;
s6, the cloud computing data processing server obtains the offset l of the bridge tower according to a displacement formula, wherein the displacement formula is as follows:
l＝ΔL×tanθ
s7, the cloud computing data processing server stores the current offset l and the warning values lmin and lmax of the offset l, the site constructor can inquire the current offset l at any time through a web browser, and when l is larger than lmax or l is smaller than lmin, the site constructor can perform early warning prompt on other operators in site construction through interphone channel broadcasting.
In the above steps, the monitored sensitivity s can be adjusted by changing the size of the included angle θ, and the calculation formula of the sensitivity s is as follows:
wherein 0 ° < θ <45 °, i.e. the value range of the sensitivity s is: 0< s < 1.
When contained angle theta is 30 degrees, for more optimization, reasonable selection, both properly improved the precision of monitoring and also considered the length of regulating plate, avoid leading to difficult installation because of its length overlength.
Compared with the prior art, the invention converts the vertical displacement value measured by the laser range finder into the transverse left-right offset displacement value of the bridge tower through the adjusting plate, and can provide a precision coefficient for the measured value by adjusting the angle of the adjusting plate, thereby improving the sensitivity and precision of measurement.
The present invention is not limited to the above-mentioned preferred embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
Claims (8)
1. The utility model provides a long span bridge king-tower off normal laser monitoring devices which characterized in that includes:
the adjusting plate is arranged at the center line position of the top of the bridge tower, and the plate surface of the adjusting plate is vertical to the side surface of the bridge tower;
the laser range finder is arranged at the center line position of the bottom of the bridge tower, the included angle between the axis of the laser range finder and the plate surface is theta, and the laser range finder is connected with a wireless data transmitter;
the cloud computing data processing server is used for receiving the signals sent by the wireless data transmitter and computing the left and right offset of the bridge tower according to the signals;
the step of calculating the left and right offset of the bridge tower is as follows:
s1, respectively fixedly mounting an adjusting plate and a laser range finder on the side surfaces of the top and the bottom of the bridge tower, wherein the adjusting plate and the laser range finder are arranged on the same side and are both arranged at the center line position of the bridge tower;
s2, adjusting the laser range finder to enable the axis of the laser range finder to be parallel to the vertical central line of the side face of the bridge tower, adjusting the adjusting plate to enable the adjusting plate to be perpendicular to the side face of the bridge tower, and enabling the axis of the laser range finder and the plate face of the adjusting plate to form an included angle which is theta;
s3, connecting the laser range finder with the solar power supply device and the wireless data transmitter;
s4, arranging the cloud computing data processing server in a bridge construction building site command center, and receiving a signal sent by the wireless data transmitter through the cloud computing data processing server;
s5, the cloud computing data processing server receives a signal sent by the wireless data transmitter, and takes a static state of the bridge tower just after completion as a displacement balance point, at the moment, the initial distance L0 between the laser range finder and the adjusting plate is recorded, in the construction process, the laser range finder monitors the distance L between the laser range finder and the adjusting plate, and the cloud computing data processing server computes a displacement variable delta L, wherein the delta L is a difference value between L and L0;
s6, the cloud computing data processing server obtains the offset l of the bridge tower according to a displacement formula, wherein the displacement formula is as follows:
l＝ΔL×tanθ
s7, the cloud computing data processing server stores the current offset l and the warning values lmin and lmax of the offset l, the site constructor can inquire the current offset l at any time through a web browser, and when l is larger than lmax or l is smaller than lmin, the site constructor can perform early warning prompt on other operators in site construction through interphone channel broadcasting.
2. The laser monitoring device for the deviation of the main tower of the long-span bridge according to claim 1, wherein the adjusting plate is made of a non-specular reflective material or a non-transparent material.
3. The laser monitoring device for the deviation of the main tower of the long-span bridge according to claim 1, wherein the length of the adjusting plate is 2/sin θ m.
4. The laser monitoring device for the deviation of the main tower of the long-span bridge according to claim 1, wherein a solar power supply device is connected to the laser range finder.
5. The laser monitoring device for the deviation of the main tower of the long-span bridge according to claim 1, wherein the included angle θ between the plate surface and the vertical surface is in the range: 0< theta <45 deg..
6. A main tower deviation laser monitoring method for a long-span bridge is characterized by comprising the following steps:
s1, respectively fixedly mounting an adjusting plate and a laser range finder on the side surfaces of the top and the bottom of the bridge tower, wherein the adjusting plate and the laser range finder are arranged on the same side and are both arranged at the center line position of the bridge tower;
s2, adjusting the laser range finder to enable the axis of the laser range finder to be parallel to the vertical central line of the side face of the bridge tower, adjusting the adjusting plate to enable the adjusting plate to be perpendicular to the side face of the bridge tower, and enabling the axis of the laser range finder and the plate face of the adjusting plate to form an included angle which is theta;
s3, connecting the laser range finder with the solar power supply device and the wireless data transmitter;
s4, arranging the cloud computing data processing server in a bridge construction building site command center, and receiving a signal sent by the wireless data transmitter through the cloud computing data processing server;
s5, the cloud computing data processing server receives a signal sent by the wireless data transmitter, and takes a static state of the bridge tower just after completion as a displacement balance point, at the moment, the initial distance L0 between the laser range finder and the adjusting plate is recorded, in the construction process, the laser range finder monitors the distance L between the laser range finder and the adjusting plate, and the cloud computing data processing server computes a displacement variable delta L, wherein the delta L is a difference value between L and L0;
s6, the cloud computing data processing server obtains the offset l of the bridge tower according to a displacement formula, wherein the displacement formula is as follows:
l＝ΔL×tanθ
s7, the cloud computing data processing server stores the current offset l and the warning values lmin and lmax of the offset l, the site constructor can inquire the current offset l at any time through a web browser, and when l is larger than lmax or l is smaller than lmin, the site constructor can perform early warning prompt on other operators in site construction through interphone channel broadcasting.
7. The laser monitoring method for the deviation of the main tower of the long-span bridge according to claim 6, wherein the monitored sensitivity s is adjusted by changing the size of the included angle θ, and the calculation formula of the sensitivity s is as follows:
the value range of s is as follows: 0< s < 1.
8. The method for monitoring the deviation of the main tower of the long-span bridge according to claim 7, wherein the included angle θ is 30 °.
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| CN111551915B (en) * | 2020-06-10 | 2024-04-23 | 广东海洋大学 | Bridge deck height monitoring device and method based on laser ranging |
| CN111797531B (en) * | 2020-07-07 | 2023-04-25 | 四川公路桥梁建设集团有限公司 | Hinge support tower deviation calculation method for three-span cable hoisting system with tower pressing cable |
| CN112304227B (en) * | 2020-10-24 | 2022-06-28 | 浙江中岩工程技术研究有限公司 | Bridge displacement detection device and detection method thereof |
| CN112504260B (en) * | 2020-10-28 | 2023-08-25 | 中铁大桥局集团第五工程有限公司 | Real-time positioning measurement method for structural object posture based on cloud network |
| CN113555757B (en) * | 2021-07-21 | 2022-09-20 | 四川省肿瘤医院 | Laser device with analysis and calibration functions |
| CN116793180B (en) * | 2023-08-29 | 2023-10-31 | 山西建筑工程集团有限公司 | Anti-collision wall deflection measuring device |
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| DE4003932A1 (en) * | 1990-02-09 | 1991-08-14 | Messerschmitt Boelkow Blohm | METHOD FOR VISOR ADJUSTMENT IN WEAPON SYSTEMS |
| CN103245940B (en) * | 2012-12-24 | 2015-05-20 | 西南技术物理研究所 | Portable optical axis detecting system of laser range finder |
| CN103940357A (en) * | 2014-03-26 | 2014-07-23 | 北京卓越经纬测控技术有限公司 | Non-contact spatial displacement measurement device |
| CN105333822A (en) * | 2015-10-20 | 2016-02-17 | 江苏国恩信息科技有限公司 | Opening range and over stroke test mechanism for moulded case circuit breaker |
| CN105300304B (en) * | 2015-10-26 | 2017-10-17 | 长安大学 | A kind of dynamic deflection of bridge span detection method of contactless multipoint high-frequency |
| CN206056527U (en) * | 2016-09-26 | 2017-03-29 | 中国建筑第八工程局有限公司 | A kind of cast-in-place concrete deformation measuring system |
| CN106840115A (en) * | 2016-11-23 | 2017-06-13 | 广西交通科学研究院 | Electromagnetic levitation type bridge main tower tower top deviation measurement device and its measuring method |
| CN206321248U (en) * | 2016-11-23 | 2017-07-11 | 广西交通科学研究院 | Electromagnetic levitation type bridge main tower tower top deviation measurement device |
| CN106438220A (en) * | 2016-12-01 | 2017-02-22 | 三重型能源装备有限公司 | System and method for monitoring dangerous torsion changes of draught fan tower drum |
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