Wuhan Changfeng Avenue viaduct twist length 174 meters, 32 meters wide, is the most difficult construction Changfeng Avenue elevated section. Bridge Han Yi, Han Dan railway tracks a total of four shares, a day after a train 171 pairs, an average of four minutes per trip there, very busy. To reduce interference railway artery, the design approach taken by the horizontal swivel construction, divided into two sections each twist, after closure. Specific processes: first install the swivel ball joint in the construction of railway bearing on both sides of the stage, pouring piers, then along the direction of placing railway bridge girder, box girder horizontal swivel and finally across the Han Yi, Han Dan railway.

As of April 6, wherein one side of the bridge pier construction has been completed; the other side of the pier construction to 6.5 meters high, will continue to grow as high as 23 meters.

Changfeng Avenue Expressway reconstruction project west Third Ring bamboo Ye Haili cross, east Second Ring Interchange Chang pier, a total length of 7.2 km, press "+ mainline elevated ground Voeux Road" mode construction, Wuhan Fair Park main road supporting the expected September opening. In addition to the elevated section across the Han Yi, Han Dan railway, will leap into the Light Rail Line 1 appearances and Beijing-Guangzhou railway, construction difficult, currently only across the Han Yi, Han Dan railway section horizontal swivel construction.

Two giant turntable to rotate 28,000 tons

Changfeng Avenue across the Han Yi, Han Dan railway swivel bridge is divided into two sections: a period of 14,500 tons, 13,500 tons another section, how to complete the twist?

April 6, the construction of CLC, has been built under the two piers, each security has a big turntable, jack continuous action through computer-controlled Big Wheel strand and force together, holding-built bridge slowly rotating, like "donkey mill."

Entire core rotation means, it is both the Big Wheel - they are special ball joints, each four meters in diameter and weighs 10 tons, in Luoyang, Henan Province ordered, are currently in place.

According to the plan, in August, "Twist in the air" will use the railway "window period" to complete, heavier within a period of 93 minutes at 109 degrees clockwise, lighter within a period of 59 minutes at 71 degrees clockwise, the final "handshake" docking. After two giant twist ending, it will conduct a final closure section construction.

It is understood that the swivel bridge is not straight, the radius of 600 meters located on the curve, which gives swivel challenges. Technical personnel, curved bridge and a straight bridge the biggest difference is two-way asymmetric, easily shifted, the control of high precision.

Under the viaduct, high-speed rail motor car a top speed of 250 kilometers, when the air swivel, even a screw fall, the consequences are unimaginable.

Just in case, will be installed on the bridge anti-cast net twist, using hanger closure section closed construction method to ensure a screw will not fall into the railway track.