The wisdom of the Fujian people 丨 Fengkou Bridge and the Sea Chisuci, the world's longest public iron dual -use bridge is here

The stormy waves here are as famous as Bermuda and Hope Hope. It is one of the three major storms of storms in the world.

There is no wind here, and the speed of the water flow is equivalent to the flood peak in the middle and lower reaches of the Yangtze River. The tide difference is up to 7 meters;

Here the islands are scattered, geological is complicated, and hard -as -like light -like rocks are nightmares for piles to build pier;

Native

This is the world -renowned style of the "Bridge Bridge Forbidden Area" -Pingtan Strait.

Picture source: Pingtan, China

But since 2013, seven years later, the world's longest cross -sea public railway two -purpose bridge has risen here.

——The is the Pingtan Strait Gongtai Bridge.

Nianwangshu Photo

Practice "Structure" under the wind and waves

The Pingtan Strait Gong Railway Bridge is the Fuzhou to Pingtan Railway and Changle to Pingtan Expressway. It adopts a joint construction method to jointly cross the north exit of the Haitan Strait. The public iron cross -sea bridge is used.

The Pingtan Strait Gong Railway Bridge has a total length of 16.34 kilometers. The structure of the whole bridge is 1.24 million tons and the amount of concrete is 2.94 million cubic meters.

Picture source: CCTV

The environment of the Taiwan Strait in the bridge site is complicated, the construction conditions are harsh, and the construction difficulties are extremely difficult. The bridge is recognized as the most difficult bridge in the world in the bridge industry, which can be called the "super bridge project".

Pingtan Strait is "rich in".

How big can the wind here? It is no exaggeration to say that it is so big that the typhoon needs to be studied here. It is preferred to return to the mountain to push the stones than piled a 10cm sand sculpture in Pingtan.

Picture source: CCTV

It is self -evident under such wind conditions.

The wind and waves are surging, and the wave power of the Pingtan Strait waters is more than 10 times that of the inland river such as the Yangtze River. The windy days above the 6th level of the year exceeded 300 days. According to the requirements of the specifications, it is impossible to operate more than the 6th wind on the scene.

Sometimes the waves are 5 meters high, and the newly hit steel pipe piles are crooked when watching the next morning.

The huge waves shock the channel bridge main pier coffin. Picture source: Zhongtie Bridge Bureau

Because Pingtan is an island, all the materials must be transported through sea, and a large ship stops, which has a great impact on the logistics organization.

In August 2015, the typhoon "Sudero" carried the 15 -level wind and screamed. After drilling the holes, it was impacted and collapsed by the big waves. In the end , To reinforce the ground layer to re -drilled the ground.

After the positioning of the steel truffle beam, the workers nailed to the connection board into the punching nail and fixed the truss beam. Nianwangshu Photo

Faced with the various tests of the "Bridge Forbidden Area", only innovation can break through. The technological innovation of the wind wave is the "stunt" developed by the bridge builders.

In order to find out the "temper" of the wind and waves near the bridge, the establishment of the China Railway Construction Bridge Bureau has established a "Research Research on the Research on the Wild and Wave Inspection Technology of a complex marine environment", and has developed a forecast monitoring platform.

Data Collection Analysis System of Data Collection and Analysis Source of the China Railway Bridge Science Research Institute: WeChat public account of China Railway Bridge Science Research Institute Co., Ltd.

The 47 Tan Tanzi speed instrument and 3 waves are arranged in the whole bridge. The monitoring data was returned to the data processing center of Wuhan Bridge Academy for analysis, and the public forecast of the waves of the waves of Pingtan Sea was associated with neurological associations.

This system realizes the wind and wave forecast within 3 to 7 days of bridge sites, which can accurately reach the specific bridge pier and become a "Zhuge Kongming" that helps the project construction borrows from Dongfeng.

After the early exploration, the construction personnel have a way to restrict the construction conditions of strong winds, high waves, and urgent water:

On the one hand, reducing on -site operations, prefabricated components as possible;

On the other hand, innovative wind barrier technology, increase operating time;

At the same time, new equipment is developed to improve the construction level of piles and hanging.

Workers in life jackets Construction of Wangshu on the pile hole platform formed by aluminum steel plates

In order to solve the problem of asymmetric and storms of the overall steel truss's center of gravity, the "Bridge Seagull" came into being.

The "Bridge Seagull" is a vertical velocity of the Zhelm Book Hermores built by the China Railway Bridge. Hanging height 110 meters.

On May 16, 2018, the "Bridge Seagull" beam was successful, marking that the last large section of the first large section of the first large section of the waterway bridge was completed. Nianwangshu Photo

On January 22, 2018, the ship successfully set up a steel truss with a weighing 3,400 tons to the top of the bridge pier, refreshing the most important record of the world bridge's entire steel truss stand, filling the steel of the large section of the cable bridge in my country The technical blank of the trusteen's entire hole hanging rack is used to achieve a leap from the single shelf to the entire pore rack.

On December 28, 2018, the first navigation Kongbridge of the bridge was a large and small tracting waterway bridge steel truss beam. Nianwangshu Photo

The world's largest diameter "Dinghai God Needle"

The geological conditions of the Pingtan Strait are complicated. To build a bridge, the sea beds on both sides of the island are almost all exposed hard granite.

In 2015, the bridge began to pile, and the steel pipe piles walked down a little bit, but they could not stand firmly.

Because the bottom of the sea is too hard, the bottom of the steel pipe pile was squeezed back and rolled back. The layers were piled at the bottom, and the rock was not hit at all. Construction environment Geological conditions Complex Source: Pingtan Rong Media

The slope surface is 1.5 kilometers continuously tilted nude rocks, and 13 piers are all placed on it. In routine, there are only one or two pier with this condition that cross -sea bridge.

The construction of the sea must be stabilized first. For this reason, the China Railway Construction Bridge Bureau has developed the first domestic "deep -water nude rock area buried sea platform".

Construction technical map of buried steel hybrid combination platform: Pingtan, China

To build this platform, we must first use the submarine scanning technology to find out the underwater situation where the steel pipe pile is located. The workers put the steel pipe pile with a few suitable lengths at the predetermined location, and then welded these steel pipe piles into one in one. Drilling through each steel pipe pile, drilling a pile hole with a deep diameter of the steel pipe pile in the bottom of the sea, injecting concrete riveting piles to form a "bench" with several legs, and then extended outward to deep water naked naked Rock drilling construction platform.

The world's largest diameter bridge pile base embedded rock pile has become the "Dinghai God needle" for the bridge to stand firm.

On May 21, 2016, the first main tower pier steel crane coffin coffin of Pingtan Strait Bridge was successfully lifted successfully. Nianwangshu Photo

Some piles inserted into the rock formation pile diameter reached 4.5 meters, and the pile diameter became thicker and increased hardness, which also reduced the number of steel pipe piles, thereby shortening the construction cycle.

The red arm of the mixing boat "Iron Construction 01" extended the red arm to the top of the concrete at the top 37 of the 22 -meter. Nianwangshu Photo

How to accurately into the hard underwater rocky rocks becomes a new challenge. The China Railway Bridge has independently developed the world's most advanced KTY5000 hydraulic dynamic head rig, drilling a diameter with a diameter of 4.5 meters into a hard seabed.

The first deep -water steel guard was set up, the first supporting steel crane installation, and the first time the deep -water pier body was irrigated by the first sea ... Fuping high -speed rail Beidou Waterway Waterway Bridge No. 26 pier, creating a Fuping high -speed rail Multiple firsts. Nianwangshu Photo

To innovate to solve the answer, in the construction of the Pingtan Strait Gongtai Bridge, such examples are everywhere:

In order to solve the difficulty of installing the upper part of the steel truss beam at sea, the builder adopted the factory manufacturing, welded the steel truss directly into a pore steel beam weighing about 1490 tons in the factory, and was transported by a special ship to the position of the standing rack to set up a rack to set up a rack on the shelf. This technology is the first application of similar bridges in China;

In order to solve problems such as long operating time, slow bridge speed, and high risk of high -altitude operations at sea, the first domestic "dual -hole continuous assembly bridge -making machine" was developed, and the national patent was obtained;

Autonomously develop a large hydraulic dynamic head rig, which can be drilled in a 5 -meter diameter drilling pile at a time to successfully build the world's largest bridge engineering pile;

Native

On May 12, 2019, the last hole of the Pingtan Strait Bridge Bridge was set up. Nianwangshu Photo

On September 25, 2019, the Pingtan Strait Gongtai Bridge across the line.

In seven years, this super project, known as the "Dream Bridge", has created a series of remarkable for the buried steel mixed combination maritime platform, the dual -hole continuous assembly of the bridge, the "bridge seagull", etc. The major achievements have filled many "Chinese blank" and "world blank".

Photo by Jiang Xinheng, the first two -hole consecutive bridge -making machine in the country

Today, this project that has been rated by countless people as "impossible" will not only stand in the sea, but also stand firmly in the long history of history; not only span the strait, but also span the time and space.

The bridge is opened to traffic Lin Yingshu Nianwangshu Photo

The long -lasting craftsman's spirit, writing the magnificent chapter of the bridge, is the embodiment of the new wisdom of the Fujian people, and it is also a vivid practice of Chinese manufacturing.

Source: Editorial Department of "Fujian Wisdom"

Content comprehensive: China Discipline Inspection and Supervision Newspaper, Pingtan Comprehensive Experimental Zone Rong Media Center Lin Shuling Wengjuan, Xinhua News Agency

- END -