The world's first three-tower, four-span, double-deck steel truss girder suspension bridge opened to traffic
On May 27th, it was built by CCCC Second Aviation Bureau.
The world's first three-tower four-span double-deck steel truss suspension bridge
Wenzhou Oujiang Beikou Bridge completed and opened to traffic
Marking my country's coastal traffic artery
Ningbo to Dongguan National Expressway
The last node realizes the connection
The Beikou Bridge project has a total length of 7913 meters
Among them, the main bridge spanning the Ou River is 2090 meters long
Adopt the design of "two bridges combined"
The upper level is Yong-Dong Expressway
Two-way 6-lane expressway standard
Design speed 100 kilometers per hour
The lower level is the National Highway G228 Nanjin Highway
Two-way 6-lane first-class highway standard
Design speed of 80 kilometers per hour
bridge available
Capacity of 107,000 vehicles per day
Contracted by CCCC Second Aviation Bureau
There are two tenders for civil construction three tenders and four tenders
in
The three civil works started on April 28, 2017
Main construction content
Including South Tower, South Anchorage, South Approach Bridge, etc.
Construction of the Fourth Civil Construction Project started on August 25, 2020
Construction content
Including the main cables and slings of the upper structure of the main bridge
Cable saddle installation and erection, steel truss beam hoisting
and ancillary facilities
Since the construction of the bridge
The project team of CCCC Second Aviation Bureau adheres to the combination of production and research
Forming a three-tower four-span suspension bridge in a strong typhoon area
Superstructure construction and control complete technology
Achievements of a complete set of construction technology for caisson in the land area of the strong tide estuary
Overcome the problems of tight schedule and high security risks
Provides experience and reference for subsequent bridge construction of the same type
The opening of the bridge will help Wenzhou make good use of the construction of Guangdong, Fujian and Zhejiang coastal urban agglomerations by improving the national road network, improving the traffic capacity of the eastern coastal highway transportation channel, further strengthening the communication between the Yangtze River Delta, the west coast of the Taiwan Strait and the Pearl River Delta region, and helping Wenzhou make good use of the construction of coastal city clusters in Guangdong, Fujian and Zhejiang. important meaning. Since then, the journey time for citizens of Yueqing in Wenzhou to cross the river to Wenzhou Longwan International Airport has been shortened from more than one hour to 15 minutes.
Six Breakthroughs / Looking at the Chinese Bridge
1
The world's first three-tower four-span double-layer steel truss girder suspension bridge structure
Oujiang Beikou Bridge
my country and the world at present
The most technical difficulty, the construction process
one of the most complex bridges
Adopt three-tower four-span double-layer steel truss structure
world's first
The bridge includes south anchorage, south tower, middle tower and north tower
Main structures such as north anchorage, main cable and main beam
The average height of the 3 main towers is 139 meters
The main girder on the upper part of the bridge
It is composed of 110 steel truss beams
The bridge has two main cables
Each main cable consists of 169 strands and is 2300 meters long
Can lift about 1.5 "Liaoning" aircraft carriers
Total wire length of the two main cables
Combined, it can circle the earth 2 times
2
The world's first multi-tower continuous-span suspension bridge with high stiffness concrete mid-tower
Oujiang Beikou Bridge is in the estuary area
The marine environment is highly corrosive to steel structures
Concrete tower durability and corrosion resistance
Better than steel structure
And the post-maintenance work is greatly reduced
at the same time
In order to reduce the deformation of the main beam under the action of the moving load
Improve the driving comfort after the completion of the main bridge
The bridge was finally adopted
Longitudinal A-shaped concrete tower scheme
This is a world first
3
The world's first deep silty clay super-large caisson foundation in the estuary of strong tides
Anchor is an important part of suspension bridge
The caisson is one of the basic forms of anchorage
It is buried deep in the ground, on which sits the anchor body
The anchor body anchors the main cable of the bridge
bear the load of the entire bridge
South Anchorage of Oujiang Beikou Bridge
caisson plane size area
Equivalent to 10 standard basketball courts
22 storeys high
About 230,000 cubic meters of shared concrete
The total weight of the caisson is 500,000 tons
sinking process
like in "cream" and "gummy"
Stabilize the giant "scale weight"
Give caisson attitude control
and steady sinking brings many challenges
CCCC Second Aviation Administration Project Team
Innovative research and development of "underwater rapid soil borrowing device"
Design inspired by quadcopter drones
By installing four sets of reamers
Cutting the soil to form lumpy soil
Then suck it out through the air suction pump
Effectively solve the problem of soil borrowing from clay silt layer
4
The world's first deep groove saddle
- The largest "comb" in the world
Oujiang Beikou Bridge is designed with 3 main towers
A "cable saddle" is installed on top of each main tower
The role of the saddle is to place the main cable strands
As a transition force point of the main cable corner
Evenly transfer the load to the main tower
The saddle looks like a "comb" in appearance
The gap between its baffles is used to place the main cable strands
Middle tower cable saddle of Oujiang Beikou Bridge
Its comb plate (clapboard)
20 to 30 cm from common cable saddles
increased to 90 cm
This is the world's first deep groove saddle
Can be vividly called the world's largest "comb"
5
The first intelligent deep groove saddle robot in China
Using a robot to "comb the hair" of the bridge
Stranding into the saddle is one of the key processes in the erection of the main cable
To put the main cable strands in
In deep grooved cable saddles with vertical partitions
If manual smashing is used
It is easy to cause loose wire, skip wire, drum wire, etc.
and cannot be placed accurately and quickly
Inside the vertical bulkhead of the cable saddle with a depth of close to 1 meter
CCCC Second Aviation Administration Project Team
Successfully developed the first intelligent deep groove saddle robot in China
The robot uses a hydraulic ejector as a manipulator
"Push" the cable strand into the cable saddle
Successfully solve the problem of jumping wire and random wire
Saddle ergonomics increased by 30%
6
The world's largest lifting capacity cable-mounted crane
The heavy weapons of the great powers provoke "thousands of jins"
Steel truss girder of upper structure of Oujiang Beikou Bridge
A total of 110 hoisting sections, nearly 80,000 tons
Among them, the maximum weight of a single segment exceeds 800 tons]
how to be on the water
How about splicing together such a heavy steel truss beam?
Suspension bridge installation equipment developed by CCCC Second Aviation Bureau
The world's largest lifting capacity cable-mounted crane
The 1,000-ton cable-mounted crane provokes a "burden"
Easily walk the "tightrope" at a height of 100 meters
Its novel design and simple structure
At the same time, it has the function of large inclination swing
solved
Large-tonnage, long-span suspension bridge box girder section hoisting
Poor synchronization stability, lifting capacity
and the problem that the lifting speed cannot be guaranteed
2017-2022/ Bridge Growth
▲ On May 15, 2018, the first sinking of the caisson in Nanmo Anchorage was completed.
▲ On November 20, 2018, the construction of the south tower cap was completed.
▲ On November 11, 2019, the construction of the towers of the South Tower was completed.
▲ On March 26, 2020, the South Tower was successfully capped.
▲ On April 12, 2020, the construction of the caisson in the Nanmo Anchorage was completed.
▲ On February 24, 2021, the first main cable strand was erected.
▲ On April 7, 2021, all the main cables of the bridge were erected.
▲ On July 14, 2021, the bridge entered a new stage of steel girder erection.
▲ On October 15, 2021, the bridge completed the hoisting of the steel truss girder in the intersection area of the cable girder.
▲ On December 30, 2021, the bridge was successfully closed.
▲ On January 14, 2022, the main works of the bridge will be completed.
▲ On April 22, 2022, the asphalt paving of the steel deck of the main bridge of the bridge was completed.
▲ On May 9, 2022, the main bridge completed the load test.
▲ On May 27, 2022, the bridge was completed and opened to traffic.
The original intention is not changed, and the struggle is hard
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