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(Chinese international channel reports the official opening page of the Hong Kong-Zhuhai-Macao Bridge, the picture is from the video screenshot)

Hong Kong-Zhuhai-Macao Bridge is indispensable for sensor black technology

Name: High-precision tilt sensor

Role: real-time monitoring

Inclination sensors, also known as inclinometers, inclinometers, spirit levels, and inclinometers, are often used to measure horizontal angle changes in systems. Levels from simple blister levels in the past to current electronic levels are the result of the development of automation and electronic measurement techniques. As a testing tool, it has become an indispensable measurement tool for bridge erection, railway laying, civil engineering, oil drilling, aviation navigation, industrial automation, intelligent platform, and machining. The electronic level is a very accurate inspection tool for measuring small angles. It can measure the inclination of the measured plane relative to the horizontal position, the parallelism and verticality of the two parts.

It is understood that because the Hong Kong-Zhuhai-Macao Bridge needs a lot of long and heavy huge concrete immersed pipes, and then transport them to the construction sea area, installed into the submarine base trough, these immersed pipes are like the big pendulum under the sea, and need to accurately measure the left and right , the swing up and down and the direction of the tilt. Due to the deep sea water, the ultra-low frequency of the immersed tube movement is impossible, and it is impossible to measure if the sensor is not extremely sensitive.

Finally, a sensor technology company in China deeply analyzed the docking problem of deep water pipe joints, and decided to adopt the method of monitoring the movement posture of the pipe joints to ensure the smooth docking of the pipe joints. Test points were set at the front and rear ends of the pipe joints, and the key points were The front end is provided with a plurality of backup sensors to ensure the accuracy and reliability of the test signals, and the monitoring of the deep water long-period pipe joint motion posture belongs to ultra-low frequency and small amplitude vibration. This is the most advanced micromachined gyroscope and high precision tilt sensor in China.

Name: High precision gyroscope

Role: to achieve accurate docking of curved lines

The gyroscope is an angular motion detecting device that uses a momentum moment sensitive housing of a high-speed rotating body to orbit the one or two axes orthogonal to the rotating shaft with respect to the inertial space. The gyroscope is divided into a piezoelectric gyroscope, a micromachined gyroscope, and a fiber optic gyroscope. Instruments and laser gyros, they are all electronic, and they can be used with accelerometers, magnetoresistive chips, GPS, to make inertial navigation control systems.

During the construction of the Hong Kong-Zhuhai-Macao Bridge, the construction of the section curved pipe curtain tunnel encountered great construction difficulties, because how to realize the control and docking of the Hong Kong-Zhuhai-Macao Bridge connection line became the "special grade" at the time of the bridge penetration. problem". It is understood that due to the limitation of geographical terrain, the Gongbei tunnel adopts the curved pipe curtain construction technology. Because the tunnel has a section that is not straight, the construction of the super large curved pipe curtain is very difficult.

Finally, the gyroscope technology was adopted to implement the precise docking of the curved line. This is the key control project of the Zhuhai connecting line of the Hong Kong-Zhuhai-Macao Bridge.

Name: Laser sensor

Role: measuring and positioning the immersed tube

A laser sensor that uses laser technology to measure a sensor consisting of a laser, a laser detector, and a measurement circuit. The laser sensor is a new type of measuring instrument. Its advantage is that it can realize non-contact long-distance measurement, fast speed, high precision, large measuring range, strong resistance to light and electric interference. Since the Hong Kong-Zhuhai-Macao Bridge uses a lot of submarine immersed pipes, ordinary sensors cannot be realized when measuring their position.

The three-dimensional visual measurement system consisting of laser sensors can measure and locate tunnel excavation section measurement, ship anchoring location and multi-beam measurement display underwater three-dimensional topographic map. This technology is in a leading position in the world.

Name: Monitoring sensor (displacement sensor, hydraulic load cell, etc.)

Role: monitoring the health of the bridge

As Zhuhai Macau and Hong Kong are close to the coastal areas, they encounter a variety of typhoons every year. In the event of strong winds, the safety monitoring of bridges is of paramount importance. In the design of the Zhuhai-Hong Kong-Macau Bridge, in addition to using better equipment to ensure the bridge's compression and normal operation, a powerful sensor detector has become an indispensable black technology product. It is reported that there are many hydraulic load cells, torque sensors, gravity sensors, etc. on the Zhuhai-Hong Kong Bridge. They send the latest data to the monitoring system to achieve accurate judgment on the health status of the bridge.

Thousands of sensors form the high-precision sensing system of the Hong Kong-Zhuhai-Macao Bridge

In addition to the four technically difficult sensors listed in the above-mentioned small series, various sensors are installed on the Hong Kong-Zhuhai-Macao Bridge to use them for wind speed, temperature, humidity, pressure, air pressure difference, and carbon dioxide in the tunnel. The parameters such as the concentration of nitrogen oxides and micro-particles are monitored in real time. According to rough statistics, the Hong Kong-Zhuhai-Macao Bridge uses at least a thousand related sensors. Gas sensors, temperature and humidity sensors, pressure sensors, laser sensors, etc. are essential. Together they form the high-precision sensing system of the Hong Kong-Zhuhai-Macao Bridge.