Labajin Bridge

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Labajin Bridge
腊八斤特大桥
Yingjing, Sichuan, China
750 feet high / 229 meters high
656 foot span / 200 meter span
2012


One of the ten largest viaducts in the world, the huge new Labajin Bridge is a spectacular new addition to the G5 north-south highway that connects Chengdu with Kunming in China's western province of Sichuan. The most amazing part of this bridge is pier 10 which rises 600 feet (182.6 mtrs) from the foundation. This is the 3rd highest bridge pier ever built in China and ranks 5th in the world after Millau in France and the San Marcos bridge in Mexico.

The Labajin Bridge uses a unique concrete pier design that the Chinese developed for just 3 large bridges on the Yaxi highway. The other two spans to use this first-ever technique are the Heighigou and Tangjiawan Bridges.

The concept behind the SRC or steel reinforced concrete column is to combine the shear-wall strength of concrete but retain steel tubes for cross bracing and to maintain the skeletal strength of the piers to meet seismic requirements of bending and flexibility. The optimum height level for each concrete pier section was 12 meters which was partly determined by the weight of a 12 meter steel column which has a weight of 30 tons. The concrete is placed on both the outside and inside of the steel tubes making for a steel and concrete sandwich. At each 12 meter interval there is a flat concrete deck that gives the 4 walls rigidity. The two parallel piers are 13.8 meters by 6.8 meters at the base and taper to 10 by 6.8 meters at the cap. The 5.6 meter gap between the two parallel piers are connected by steel truss tubes. Pier 10 contains 16 levels of boxes that support the ends of the two largest spans of 656 feet (200 mtrs). This unique type of pier has never been done before. This is grand scale bridge building of the tallest order and the highway planners have wisely decided to build a tourist parking area that will allow people to take in a view of the bridge and ravine.



Labajin Bridge Elevation


You can see a video of the bridge and highway project here: http://v.youku.com/v_show/id_XMTQwMTM2ODI4.html

Some construction footage of the piers can be seen here: http://v.youku.com/v_show/id_XMTM0MjUwNTcy.html


作为世界规模前十的高架桥梁之一,宏伟的腊八斤大桥是中国西部省份四川省会成都和云南昆明之间的一条高速公路上的新建大桥。最令人吃惊的是该桥的10号桥墩,自基础向上高达182.6米。这是中国境内建成的最高的桥墩,也是世界第四刚度,紧紧排在法国的米约、墨西哥的圣·马科斯大桥以及同样将在2012年将建成的埃尔·卡里佐大桥之后。与中国其他的大桥桥墩所不同的是,腊八斤大桥的这些最高桥墩的结构很特殊,是所谓的“钢管混凝土组合柱”形式,先在桥墩四角安装四根钢管柱,钢管柱内浇筑混凝土,再用钢筋混凝土将四根钢管柱包围,并用钢筋混凝土板连接,形成空心箱结构(每次形成桥墩的一层)。然后,10号桥墩共有16层,在顶部承担着200米的主跨的一端。因此,这一座建在最高墩上建成的特大桥,路桥设计者们还很英明的设计了一个紧急停车道,可以让有可能驻足欣赏大桥周边的美景


Image By 从一品尚书.


Image By 从一品尚书.


Image by LSZ.gov.





image by www.scol.com.cn



Image by www.beiww.com




Labajin Bridge pier design.



Drawings of the unique pier frame design.



A view of one of the unique box piers formed with 4 large steel tubes at the corners.





For those who might be interested, the list below shows the World's 10 Tallest Bridges as measured from the top of the foundation to the top of the tower. All are suspension or cable stayed bridges.


1. Hutong Bridge, China 345 meters

2. Millau Viaduct, France 336 meters

3. Russky Island Bridge, Russia 320 meters

4. Sutong Bridge, China 300 meters

5. Stonecutters Bridge, China 290 meters

6. Akashi-Kaikyo Bridge, Japan 287 meters

7. Chishi Viaduct, China 287 meters

8. Yi Sun-sin Bridge, South Korea 270 meters

9. Jingyue Bridge, China 265.5 meters

10. Guizhou Bridge, China 262 meters


Image by www.beiww.com


Labajin Bridge satellite image.


Satellite view of Heishigou, Labajin and Shizijinghe Bridges on the G5 expressway. Not shown is the Tangjiawan Bridge further to the south which also uses the unique steel reinforced concrete column tubes. The Shizijinghe Bridge was built with conventional concrete-only piers that are on nearly every other high beam bridge in China.


Location map of Heishigou, Labajin and Shizijinghe Bridges. Tangjiawan Bridge is just off the map to the south.


Yaxi Expressway Map.


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