Yachi Bridge

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Yachi Bridge
贵黔高速鸭池河大桥
Daguanzhen, Guizhou, China
1,424 feet high / 434 meters high
2,625 foot span / 800 meter span
2016

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With a height of over 400 meters, the Yachi Bridge is not only the world's second highest cable stayed bridge but also one of the longest with a main span of 800 meters. Wedged between two long tunnels, the 1,461 meter long structure is supported by towers as tall as 258 meters. There is no other cable stayed bridge in the world in a mountain setting as colossal as Yachi Bridge. The 800 meter span is also a record for any truss-deck cable stayed crossing.

Despite an official height of over 400 meters, Yachi Bridge is actually only 306 meters above the surface of a huge reservoir more then 130 meters deep formed by the Yachi Dam that is located just 2 kilometers downstream. The road deck is at elevation 1,276 with the surface of the reservoir at 970 meters. The original river level was at 842 meters.

With steep slopes on both sides of the canyon, Yachi Bridge has unusually short but heavy concrete back spans of only 220 meters that counteract the pull of each of the 400 meter halfs of the 800 meter main span. The span configuration is 71+72+77+800+77+72+71 +8x30 meters. Yachi is the largest bridge on the 77 kilometer Guiyang to Qianxi 贵阳至黔西高速公路 expressway.

Yachi is one of several dozen bridges over the Wu River that are over 100 meters high. No other river on earth has as many high spans across its waters then the Wujiang. The Province of Guizhou has more high bridges within its borders then any other region on earth. All of the high bridges in Europe combined would not equal the number of Guizhou spans that exceed 100 meters in height.

Yachi Bridge might also hold the record for the fastest construction ever for a large size cable stayed span with a total construction time of 3 years. Crews were reportedly working 7 days a week on multiple shifts including holidays.


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Yachi Bridge Elevation


鸭池河大桥桥面高度超过400米,不仅是世界第二高的斜拉桥,同时也是跨度最大的斜拉桥之一,主跨达到800米。两侧都是隧道,中间的主桥长达1461米,由258米高的主塔支撑。在世界山区斜拉桥中,此桥的规模是绝无仅有的第一。同时其800米跨度在钢桁梁斜拉桥中也是最大的。

虽然此桥到原始河面的高度超过了400米,但桥面到水库水面不过306米高。桥下是一个深达130米以上的水库——东风水电站,其大坝位于桥址下游二公里处。桥面高程海拔1276米,水库满水位海拔970米,原始水位海拔842米。

因为峡谷陡峭,鸭池河大桥边跨只有220米,边跨使用沉重的钢筋混凝土结构,以平衡每侧主跨400米钢桁梁的重量(斜拉桥桥塔两册斜拉索总受力必须均匀)。桥跨结构为71+72+77+800+77+72+71 +8x30米。鸭池河大桥是77公里长贵阳到黔西高速公路上最大的控制性工程。

鸭池河大桥是乌江上许多高度超过100米的桥梁之一(鸭池河是乌江上游段当地的名字)。地球上没有一条河上桥面高度超百米的桥梁数量能和乌江相比。贵州省内高桥的数量超过世界其他地区的总和。欧洲所有高桥的数量之和,还不及贵州比其更高100米的桥梁数。

鸭池河大桥同时保持着另一个世界纪录,一座大规模斜拉桥仅用3年建成。据报道工人们每周七天都在修桥,假日也有人干活(估计有倒班。


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Yachi Bridge center span truss cross section.


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Ben Usagani.


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Image by Eric Sakowski.


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Image by Eric Sakowski.


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Image by Eric Sakowski.


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Yachi Bridge cable stay truss connection diagram.


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Yachi Bridge plan.


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Image by John Hart.


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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A drawing of the transition between the concrete back spans and steel truss at each tower.


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Richard Scott.


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Image by Richard Scott.


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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The West tower rises 258 meters.


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Image by Eric Sakowski / HighestBridges.com


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These unique circular anchors will be placed inside the thick concrete back span beams whose weight will be strong enough to counteract the weight of the all steel main span stretching 800 meters across the river channel. This unusual engineering solution was necessary to maintain the equal weight of a balanced cantilever since since the back spans are only half the length of the main span. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Aerial view of the giant reservoir and the east tower.


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Aerial view of the west tower that will eventually rise to 258 meters.


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Yachi east tower construction in 2014. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Yachi Bridge east tower. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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A view of the taller west tower from the east side. Image by Eric Sakowski / HighestBridges.com


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Base of the west tower. Image by Eric Sakowski / HighestBridges.com


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West tower construction. Image by Eric Sakowski / HighestBridges.com


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Completed in 1995, the Yachi Dam is located 2 kilometers downstream of the bridge. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Old and new crossing of the Wujiang River 1 kilometer north of the dam. Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Image by Eric Sakowski / HighestBridges.com


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Tianzhu Peak overlooks the junction of 3 of Western China's greatest waterways - the Wujiang, Sancha and Liuchong Rivers.


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Foundation work on one of the Yachi Bridge towers.


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Yachi Bridge satellite image.


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Yachi Bridge satellite image before construction began.


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Yachi Bridge location map.


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Guiyang to Qianxi expressway map.

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