Guizhou Echo | The new Huayudong Bridge in Guizhou wins highest international award

花鱼洞大桥拆除和重建项目旨在是对老花鱼洞大桥进行重修；花鱼洞大桥位于中国西南部的贵州省，

The Huayudong Bridge Removal and Reconstruction Project aims to renew the old Huayudong Bridge which is located in Guizhou, southwest of China.

跨越红枫湖国家公园及百万级人口饮用水源保护区。

The Project spans Hongfeng Lake National Reserve and a drinking water supply protection zone for four million residents.

自上世纪起是沪昆国道的控制性工程。

It has been a key point of the Shanghai-Kunming national highway since last century.

为提高服务水平和通行能力，将原桥拆除重建。

For the purpose of improving the capacity of traffic service, the old bridge was decided to be removed and conduct the rebuild.

秉承生态建桥理念，为减少旧桥拆除对环境的干扰

Within the environment-friendly concept of construction, to reduce the impact of old bridge demolition on surroundings,

设计师首次提出“利用新拱拆旧桥”设计思路

the design idea of “Using new arch to remove the old bridge” is proposed by the Engineer for the first time in worldwide;

采用180米的中承式钢管混凝土拱，将新拱肋布置于旧桥两侧

two of the 180m half-through concrete filled steel tubular arches were adopted for new bridge and set on both sides of the old bridge.

施工中先安装新拱肋，然后将旧桥扣挂于新建拱肋之上，

During the construction, the new arch ribs were erected firstly, and then the old bridge was hung and connected on new arch ribs;

逐段切割，倒装拆除旧桥。

thereupon the old bridge was chain-sawed segmentally for deconstruction.

本项目首创了拱桥拆除的新型体系转换工法，并研发了配套装置。

The Project initiated a new conversion method of bridge structural system for arch bridge demolition and developed the accessory equipment as well.

预加顶推力后切割拱顶，

A jacking force is pre-applied to the vault,

逐级释放轴力，

then cut the vault while axial force is released gradually,

最终完成旧桥结构体系转换。

and finally achieves the conversion of the old bridge structural system.

通过以上措施，使结构体系转换瞬间产生的冲击荷载和变形得以逐级缓步释放，确保了施工安全性。

Through the above method, the impact load and deformation generated at the moment of structural system conversion can be released step by step to guarantee the construction safety.

为了达成绿色建桥的目的，

To minimize interference of construction to the environment,

切割过程中，喷淋降尘，

a spraying device for dedusting was adopted in demolition process.

设置挂篮集中收集废水，经酸碱中和沉淀、隔油除渣处理后循环利用。

The resulting wastewater was centralized collection for cyclic utilization; after acid base neutralization precipitation, as well as oil separation and slag removal treatment, the treated wastewater was reused for site construction.

将旧桥构件拆除破碎后作为路基填料重新利用，

The components of old bridge were dismantled, broken and reused as roadbed filler in the Project,

节约填料1953方，减少碳排放1.5万吨。

saving 1,953 cubic meters of filling while reducing carbon emissions of 15,000 tons.