Bosideng Bridge
Coordinates: 28 ° 53 ′ 32 " N , 105 ° 52 ′ 47" E
| Bosideng Bridge | ||
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| Official name | chinese 波司登 大桥 | |
| Convicted |
 Chengdu-Chongqing ring road |
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| Subjugated | Yangtze River | |
| construction | Arch bridge in CFST technology | |
| overall length | 831 m | |
| Number of openings | 15 (including preliminary bridges) | |
| Longest span | 530 m | |
| completion | 2012 | |
| location | ||
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The Bosideng Bridge ( Chinese 波司登 大桥 ) is a CFST bridge (tubular steel arch bridge filled with concrete) over the Yangtze River in the Chinese province of Sichuan . The bridge, 45 kilometers east of Luzhou , is the first river crossing in the province and crosses the Chengdu-Chongqing ring road . With a span of 530 meters, it is the third largest arch bridge in the world and the largest CFST bridge in the world.
planning
A suitable location for the Yangtze crossing near Rongshanzhen had to be found for the G93 . Three variants of the structure, which was first designated as Hejiang Bridge 1 , were examined: a suspension bridge , a steel arch bridge and a CFST bridge. The CFST bridge turned out to be the cheapest and the least steel needed to build it.
Compared to a suspension bridge, the CFST bridge requires less maintenance, but the technology for the construction was more complex, especially because a CFST bridge with such a large span has never been built before. The longest previously constructed bridge using this technique was the Wushan Bridge over the Yangtze with a span of 460 meters.
construction
First the fighters were created. In order to prevent the thermally induced stresses caused by solidification , a high proportion of hard coal fly ash was added to the concrete .
For the cantilever construction of the arch, a 148-meter-high auxiliary tower using CFST technology was built above the fighters, to which the arch could be braced during the construction process. Each tower had to be braced with rock anchors that were 30 to 50 meters deep, so that the tensile forces of up to 5400 t generated during the construction of the bridge could be safely absorbed.
The 40 segments of the arch, which were delivered by ship on the Yangtze, were lifted and deployed using a cable crane system running over the towers . The heaviest segment weighed 197 t and was 40 meters long. The segments were prefabricated in an upright position and adapted to the neighboring segments. By manufacturing in the later installation position, the effects of deformations that would have occurred in horizontal manufacture and later turning of the parts could be avoided.
After the arch had been assembled, its pipes were filled with 6400 cubic meters of concrete. The filling was carried out from the bottom up, the concrete being filled first at the base of the arch, then at a third of the height and finally at two thirds of the height. A partial vacuum was created in the pipe to be filled so that the concrete could be poured in without air and bubbles . It took 14 hours to fill each of the eight pipes in the bend, with 30 cubic meters of concrete being produced every hour. The raw materials for the concrete were selected very carefully in order to achieve a predictable, consistent behavior during the filling process. Fly ash was also buried here in order to reduce the heating during solidification.
Building
The bridge consists of the arch in CFST technology, which is joined on both sides by prestressed concrete front bridges in box girder construction , so that the structure has a total length of 831 meters.
The bow consists of two parallel box-shaped from pipes formed trusses , the two over 1000 cubic meters large fighters from concrete to be worn. The girders are 16 meters high at the base and taper to 8 meters at the apex , the width is 4 meters throughout. The four pipes of each beam have a diameter of 1.3 meters and a wall thickness of 3 centimeters at the base, which tapers to 2.2 centimeters towards the apex. The 6000 t heavy steel construction of the arch was filled with 6400 cubic meters of concrete after it was built.
Hangers made of parallel wire ropes attached to the arch support the 28.6 meter wide roadway girder with four lanes . It consists of a steel lattice girder coated with concrete.
Web links
- Yu Han, Dayan Qinm Zhi Feng: Key Technologies in the construction of the Bosideng Hejiang Yangtse River Bridge. 2013, accessed April 21, 2014 .
- Ting-min Mou, Bi-kun Fan, Shang-shun Lin: The Design of the longest Concrete-filled Stell Tubular Arch Bridge - Hejiang Yangtse River Bridge. 2013, accessed on May 1, 2014 .
Individual evidence
- ↑ a b Tingmin Mou, Bikun Fan, Bo Tian, Qiyu Tao: Scheme design of a 530 m CFST arch bridge - the First Yangtze River Bridge in Hejiang, Sichuan, China. (No longer available online.) Archived from the original on March 1, 2014 ; Retrieved April 30, 2014 . Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ List of the largest arch bridges
- ↑ a b c Yu Han, Dayan Qinm Zhi Feng: Key Technologies in the Construction of the Bosideng Hejiang Yangtse River Bridge. (No longer available online.) 2013, archived from the original on March 1, 2014 ; accessed on April 21, 2014 (English, Chapter 1 “Introduction”). Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ^ Hejiang Yangtze River Bridge. In: HighestBridges.com. Retrieved May 1, 2014 .
