Lu's three-dimensional scanner is being used to fully scan the chiangcheon bridge。
Golden rain (people's visualization)
"how's the jack?" "be careful, pull the seat out slowly." in wuhan city, hubei province, a high-mounted bridge that was loaded onto the bus, often led by drivers who did not know that the bridge beneath their feet was undergoing a partial “surgery” to replace the wing above the bridge. “although the amount of work is modest, the replacement of the substations without interruption requires us to calculate in advance the various parameters, the fine work, and not to fail.” lu hongqui says。
Lu hongqui is the director and senior engineer of the institute for bridge research and structural strengthening, china iron bridge scientific research institute ltd. From the technicians' journey, he has been involved in more than 100 bridges that have been treated. “our job is to treat the bridge, to detect the disease, to diagnose the cause, and finally to eradicate the disease, and to maintain the safety of the bridge.” lu hongqui said。
Diagnosis techniques are constantly being upgraded and bridge medical examinations are being made more accurate
A tripod was set up with colleagues, a 3-d scanner was installed, lu's monitor was closely watched, data changes were observed, and strung。
As one of the landmark buildings in wuhan, the rainbow-like han river and the chiangcheon bridge, which connects hanguchi and hanyang, lu and the team showed us two new techniques for detection: three-dimensional laser scanning techniques and microwave radar testing。
"a three-dimensional laser scanning technique allows quick access to detailed data on the appearance of the various parts of the bridge, key points, etc., and generates three-dimensional graphics. When compared to the early data of the bridge, we can quickly discover whether parts of the bridge have been shaped, transpositioned, etc..” lu hongqui said, “our bridge detection technology has improved considerably more than 10 years ago.”
Lu has been working on the assessment and design of bridge diseases since he graduated from university in 2007. He clearly remembers his involvement in the first bridge maintenance strengthening project, the great bridge of nanchang。
At that time, lu, along with his masters and colleagues, stopped looking at the issue of the tilt lasso, a little bit at the state of health of the key parts of the “knocking” bridge, providing the bridge with a full three-dimensional scan, identifying the “stoves” and developing “pharmaceutical formulas” and eventually completing the reinforcement of the bridge. “we had to check the issue of the tilt lasso, and have people climb the top of the ramp, not only dangerous, but also limited in sampling, with some invisibility. And now we've developed the bridge razo smart-detecting robot, which can automatically locate and return, making a precise diagnosis of each one.” lu hong-kyu said, "i went to nanchang a while ago and made a special turn on the bridge. It is a great achievement to see that we have worked well so far to repair the strengthened bridges.”
Systematic maintenance of reinforced bridges and treatment of landmarks ben
Under a junction bridge, journalists observed that some of the bridges were not only packed with a “barrel” but also had wide u-shaped “big wings” above them, holding the bridge like a big hand. “single poles have a single bearing and are easy to flip. Our design of wings is called leung, adding two points to it and a more stable structure. The steel structure, which is wrapped in steel, goes deep into the subterranean backbone and makes it stronger.” lu, while checking the operation of the pillar, described it as follows: “at the turn of some bridges, the speed locker was added above the bridge”
“doctors treat both symptoms and symptoms, and so does our work.” lu hongqui said. In his view, if there were a “secondary disease” after systematic repair of reinforced bridges, it would be the cure of the symptoms。
Ten years ago, lu took over the repair of a high bridge. After some time the bridge was running, according to the crowd, there were always pits on the bridge that were constantly being repaired. Lu xianqui said: “for a thorough diagnosis and treatment of the disease, systematic maintenance must be designed and reinforced, and headaches and feet cannot be treated.” as a result of the team's work, the bridge has not been overhauled to date, and the programme has become a common solution to similar diseases。
In recent years, the emergency management of sudden-onset diseases in the bridge has tested the team. A high-speed ramp bridge is tilted and fractured, lu hongqui and the team are in danger, carrying out a bridge assessment and reinforcement design to defuse the crisis in a relatively short period of time; affected by the floods, a railway bridge bridge has been dashed and stopped, he and the team quickly arrived on the scene to conduct monitoring and provide critical data support for follow-up. Similar emergencies are always visible to the team, and their ability to respond to emergencies has been enhanced。
Strengthen real-time monitoring of bridges and detect dangerous intelligence alerts
“see those boxes?” lu hongqui points to boxes installed above some of the bridges, some of which are receptors of the bridges, and says, “that is actually the bridge health monitoring equipment, which is connected to our back-office system, which automatically alerts back-office in case of an anomaly.”
On 26 april 2020, the main beam of the yangtze river bridge in the country of parrots experienced considerable vibrations, causing widespread concern in the community that drivers could feel uncomfortable passing through the bridge. What's wrong with the bridge? There's a lot of talk。
The bridge health monitoring system, which was set up by the central iron bridge scientific research institute ltd., recorded in a timely and complete manner key data such as wind direction, structural amplitude, structural vibration properties, duration, etc. Throughout the event. Based on the analysis, the company's testing team gave the basic analysis within 24 hours: “the incident was a wind vortex vibration, the structure vibrating at the time of the incident was larger and the key parameters of the structure after the wind shivers had returned to normal and it was recommended that traffic should not be closed.” subsequently, the team conducted an in-depth analysis of the incident-wide data, summarized the conditions necessary for wind vortex vibrations on the bridge, added monitoring equipment and developed appropriate early warning procedures。
“we are also shifting our focus towards a balance between preventive conservation, rather than waiting for the bridge to fall into disrepair, but keeping abreast of its functioning and removing potential hazards.” lu told journalists that the ams was initially used on some old bridges, and that new bridges were later added, “wuhan is an earlier city in the country with ams, and hundreds of bridges are now integrated into the `wisdom bridge' system”
Daily people's journal (18/01/07 edition 2023)
