How did China Railway Construction achieve the world record of China Bridge's aerial swivel?

After a 90-minute thrilling "flying over" in the air, Baoding swivel cable-stayed bridge located in Le Kai Street, Baoding City achieved swivel closure and broke the world record.

According to China Railway Highway Construction Corporation, this cable-stayed bridge is divided into two parts: the mother tower and the child tower. The main bridge is 495 meters long and the deck is 39.7 meters wide. Two-way eight lanes, north and south across the Beijing-Guangzhou railway artery 265,438+0 railway lines.

How does the rotary seal work? As mentioned above, the bridge structure is built on both sides of the railway, and then the cable-stayed bridge is turned and closed in place.

This method can make the bridge construction overcome the limitation of terrain, traffic and environment, save the engineering cost, shorten the construction period and ensure the safety and reliability of the construction process.

But how does such a heavy bridge turn? Will it suddenly deviate?

According to CCTV reports, in order to make this behemoth spin, the "black technology" was adopted in the bridge construction-a "rotating device" with a diameter of 6.5 meters and a weight of 92 tons was installed under the bridge foundation to make the whole tens of thousands of tons of bridge spin.

According to experts, the scientific name of this "rotating device" is "rotating ball hinge", which is mainly divided into two parts: upper ball hinge and lower ball hinge. Their contact surface is a smooth spherical structure, and the upper spherical hinge and the lower spherical hinge can rotate with each other, thus realizing the functions of bridge rotation and load bearing.

In order to make tens of thousands of tons of bridges rotate flexibly, stably and accurately, technicians adopted high-performance nonmetallic composite materials and high-precision spherical machining technology, which not only significantly reduced the friction coefficient, but also met the design requirements of large bearing capacity and solved the problems of large bearing capacity and flexible rotation of large-tonnage bridge swivel devices.

So everything is ready, how to ensure the accurate docking of the bridge?

The key point is the production and installation of this spherical hinge, which weighs more than 70 tons and has a diameter of 6 1.48 meters, and the real-time monitoring of stress, strain, displacement and straightness during the rotation process, and then the data is used to guide the construction.

During the formal rotation, the mother tower and the sub-tower will rotate at a speed of 8 meters per hour, with the mother tower rotating 49.3 degrees counterclockwise and the sub-tower rotating 50 degrees counterclockwise.

In fact, the "mother-child tower double swivel technology" used in the construction of this bridge has existed for a long time. Why did this bridge in Hebei successfully attract the attention of the global infrastructure industry?

As we all know, the heavier the bridge and the wider the pavement, the higher the technical requirements in the construction process, such as lifting equipment and precision control.