That year, on this day, the Lupu Bridge was opened and opened!A lot of precious photos, more stories behind!

June 28, 2003

At that time, the Huangpu River Bridge, known as the "first arch in the world"

——Shapu Bridge Project is completed and opened to traffic

This is obtained by the Shanghai Yuejiang Project Construction

Another fruit!

△ On the morning of June 28, 2003, the Shanghai Lupu Bridge officially opened

So

How much do you know about Lupu Bridge?

Let's go with us today

Know its story

Native

The Lupu Bridge is the sixth bridge on the Huangpu River in Shanghai. The project started construction in October 2000. From the north of Puxi Luban Road -Quxi intersection north and south viaduct roads. Connect.

The total length of the engineering line is 8.7 kilometers, of which the main line of the bridge is about 3.9 kilometers long, and the south extension section is about 4.8 kilometers. The main bridge is 550 meters, the main bridge is equipped with two -way six lanes, and the sidewalk on both sides is a sidewalk with a width of 2 meters.

The Lupu Bridge has a tourist function like Sydney Steel Structure Gongqiao Bay Bridge. Visitors can go from the four high -speed elevators at the bridgehead to the 50 -meter -high bridge deck, and then follow the sidewalk and the archway of the archway to a tourist platform of 22 meters long and 13 meters wide to enjoy the beauty of Shanghai.

Why build the Lupu Bridge?

Since 1992, Shanghai has officially opened three "three -year big change" construction climax. Those pile drivers have left a rich valuable wealth for the city. To this day, it is still the pursuit of the builders to crack the pain points of the city's operation with innovation.

In the 1980s, Shanghai people basically rely on ferry from Pudong to Puxi. With the central urban area, the bridge that created a new record is successively completed, crossing the two sides of the east and west, and the exchanges between Puxi Puxi are no longer a problem.

The realization of this "dream of crossing the river" is inseparable from the efforts of a number of builders such as Lin Yuanpei, an academician of the Chinese Academy of Engineering and the senior chief engineer of the Shanghai Municipal General Court. Yangpu, Nanpu, Lupu, and Xupu in the central urban area of ​​Shanghai, and the East China Sea Bridge to Yangshan Port are designed by him.

When building the Lupu Bridge, Lin Yuanpei also chose the arch bridge that he had never done. Because there was no experience to follow, he needed to derive the formulas, write software, and solve the problems of structural calculation and construction technology.

"80%of them, but we will overcome difficulties with 120%." Lin Yuanpei replied. After all, scientific research allows failure, but engineering does not allow, "engineers must ensure that their design can not be problems." Looking back, Lin Yuanpei admits that only by innovation in practice can we continue to improve, and innovation is forced out of difficulties.

"World's First Arch" technology revealed

Lupu Bridge five first

For the first time, a variety of craftsmanship builds one "equal" three "equal"

Unlike most of the "steel truss" arch bridge connected to the bolt, the Lupu Bridge is the world's first full -welded steel structure arched bridge. Because my country has not yet built an arched bridge of more than 500 meters, the construction technology of the Lupu Bridge integrates the three different types of bridges of the cable bridge, steel arch bridge, and suspension bridge for the first time. According to Lin Yuanpei, chief designer of the Lupu Bridge, this is also the first time in the world.

How does the continuous large steel boxes turn into two "rainbow"? According to reports, some construction methods are to assemble all a section of arched ribs on the land, and then go directly to the river through the method of "turning the arch". Essence Therefore, the builder built two 128 -meter -high all -steel temporary Sota on both sides of the Huangpu River. By using the cable -cape frame tied to the Sota, the arched rib was used to build the arched rib to form the arch.

In the process of being sent to the "sky", the construction method of the arch bridge plays a role. When the steel arched dragon, the construction process of the suspension bridge also showed its skills. Due to the gravity of the arch bridge itself, the Lupu Bridge with a span of 550 meters will generate a horizontal thrust of about 20,000 tons. Therefore, the bridge on the two "feet" on the "mud" may be "collapsed". In order to balance this power, experts will install 16 huge levels for the bridge, so that the horizontal cable will tightly "bind" the ends of the bridge together.

The first design of the unique software at any time is to grasp the situation of the bridge at any time

The construction of the Lupu Bridge needs to be converted into a number of different bridges during the construction process, and the spandema of the bridge is super long. The structural force changes greatly. Construction control and adjustment measures need to be carried out during the construction process. To solve these problems, you need to rely on the "brain" of computer software, but the corresponding calculation software cannot be found in the world.

Unprecedented available, experts have to design themselves. Before preparing software, Lin Yuanpei creatively proposed the calculation theory of "non -linear thin -walled space rod stabilization finite element method". In order to "dual insurance", the Municipal Institute of Design and Tongji University's Education and Research Office were divided into two roads, while developing design software.

According to reports, this program is currently the first design computer software in the world for such a large -scale full -welded steel arch bridge. Through it, it can verify the structural design of the bridge and whether the overall is stable. Its content can also calculate various types of bridge internal force.

The first time I use a fully welded welding deviation, I can't even climb the ants

The Lupu Bridge is unprecedented in the history of the bridge with a fully welded connection. According to Gu Xinyue, an expert from Jiangnan Shipyard, the reason why Shanghai knows is difficult and mainly based on the following considerations -

Beauty: If you connect with bolts, a bridge is densely packed with nuts and iron cables. It looks like a pimple, and the aesthetics will be greatly reduced. Economy: The steel arched rib and wind support from embolism to welding can save more than 4 million yuan of high -intensity materials and threading processing costs.

Speed ​​speed: If the Lupu Bridge is used, it may take 3-5 years to build, which takes at least one times more than it is now. Taking the arched ribs connected to the Heilong section as an example, the light of Jiangnan Shipbuilding Factory created this steel box and drilled nearly 15,000 threaded holes. It took more than 2 months from making drilling templates to completing the drilling hole.

Mobility: If an error occurs during the assembly process, you can immediately cut the cut change according to actual needs.

Although there are many benefits of welding, the difficulty also increases. The S355 N steel adopted by the Lupu Bridge is a very "delicate" steel material. The welding worker of Shanghai workers use the "embroidery" general method "melting" steel, so that the docking welds between the two huge steel arch ribs are wrong. The deviation is less than 1 mm, and even a small ant can not climb. After nearly 50 arched ribs on both sides of Pudong and Puxi, and more than 500 meters long space distance, the axis (position) bias on both sides to the Helong section is less than 5 mm.

According to the Shanghai construction worker Wang Xiaohong, the thickness of the Lupu Bridge has a thickness ranging from 6 mm to 100 mm. The welding environment itself is complicated, and the thermal expansion and contraction of the temperature, light, wind, rain, and bridge itself will make the steel structure welded in welding. Cracks or deviations occur during the process.

The earthquake that is installed for the first time will not be destroyed

Don't look at the "lonely" of the Lupu Bridge across the river, but it is definitely "strong and unyielding." Experts are specially installed with a "seat belt" for the bridge, so that the bridge can ensure that the steel plate is not cracking and the steel bars will not be broken. Even if it encounters a super earthquake in 3280, it has enough deformation ability. It shakes left and right and shakes down and shakes down, but it will never collapse.

According to Hu Shide, a earthquake -resistant expert at Tongji University, the Lupu Bridge must consider earthquake resistance, but the seismic design of the 550 -meter steel arch bridge across the 550 -meter steel arch bridge is fundamentally unregulated in my country. To this end, experts from the Civil Engineering Laboratory of Tongji University Civil Engineering Laboratory have compiled the "Code for Seismic Design of Urban Bridge", which may also be the first seismic standard for such bridges in my country. Unlike ordinary seismic specifications, the new specifications can not only test the strength of the bridge strength, but also test the deformation capacity of the bridge.

In particular, in order to ensure that the bridge is under the action of the vehicle's braking power, wind, and seismic power, the bridge deck on both sides of the telescopic joints does not collide, and the bridge also sets up four "seat belts". On the middle beam of the two bridges, the experts each placed two 3 meters long viscosity closure. Once the bridge has a severe vibration, this device will immediately have a great damping force to play a cushioning role. Suddenly, "pull" the bridge to prevent severe collisions and vibrations on the bridge surface and the middle. The world is the first time in the world of giant arch bridges.

For the first time, a wind turbine 12 -level strong wind is not afraid of the front attack

Shanghai is located in the southeast coastal area. It is affected by the wind caused by typhoons and cold waves. Especially the Lupu Bridge arches are "real -bearing". The area of ​​strong wind is greater. Therefore, whether Lupu can "stand upright" must be considered.

In order to improve the accuracy of calculation, experts from Tongji University's Winds Labs collected the three meteorological stations around Shanghai -Baoshan, Longhua and Sichuan -Sang Meteorological Station for 35 consecutive years and their corresponding wind speeds and their corresponding wind directions. Through statistics from more than 60,000 data, experts accurately "manufacture" out of the 16 directions that may encounter on the Lupu Bridge Bridge. The experts then produced a 1: 500 terrain model based on the topographic and landform environment of the bridge for wind tunnel experiments. This approach is still the first in China.

In the final stage of the entire experiment, through the 1: 100 full bridge model wind tunnel test, experts confirmed that the overall wind resistance of the bridge was excellent, and it was almost impossible to cause the vibration of the bridge to collapse. Experts also found that a series of vortex produced a series of vortex after passing through the "bridge arch". These vortex excited vortex resonance, especially in the construction stage. Bridge status is a hidden danger.

After discovering this hidden danger, the experts immediately prescribed the prescription and "coated" the upper layer of "lubricating oil" for the bridge ————— to set up multiple building membrane structures on the bridge vaults to "guide the wind". The results of the test show that the wind through these "lubricating oils" is like cars driving on the ice surface will accelerate the arch ribs.

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