geographical environment
After the completion of Ganhaizi Bridge, driving on it is like "in the clouds". After the completion of the bridge, only the Nishan Tunnel and a section of Yingjing Road are still under construction and are expected to open to traffic at the end of this month. By then, the Chongqing-Kunming Expressway, the national trunk line, will run through expressway in Sichuan, and Chengdu-Xichang will be shortened to 420 kilometers, which can be reached in 5 hours by car, saving about half the time compared with the past. However, if you need to continue south to Panzhihua, you can go through the completed expressway in Pan Xi, and the whole journey takes only 6 hours.
Due to the low temperature in winter when Ganhaizi Bridge enters, the road surface is slippery and prone to snow, and rescue and relief equipment such as snow removal vehicles will be equipped in the future. At the same time, the guardrails on both sides are also 30 cm higher than ordinary high-speed guardrails to prevent vehicles from rushing out of the bridge. In addition, the pier of the bridge also adopts a unique air traffic control design, which reduces the weight of the pier and the seismic intensity of the bridge design is 9 degrees.
build
build
Ganhaizi Bridge started construction in June, 2009. The weather is harsh all the year round, the wind speed reaches 7-8 in spring, it is rainy and foggy in summer and autumn, and the mountain is closed by snow and ice in winter, which makes the construction difficult.
In order to ensure the smooth completion of the construction, 800 construction teams from the Third Company of China Railway 23rd Bureau worked 24 hours a day, and the bridge realized the first longest concrete filled steel tubular truss beam bridge in China. The first high-rise concrete-filled steel tube lattice pier, composite pier and mixed pier; The longest continuous structure of its kind; For the first time, the steel tube steel fiber reinforced concrete structure is fully adopted, which is the first in the world.
(of a project) completed.
On April 22, 20 12, Ganhaizi Bridge was officially completed, which also marked the end of all ground civil works except partial debugging, partial installation and seven service areas. Ganhaizi Bridge, as one of the key and difficult control projects in Yaxi expressway, has attracted much attention since its construction. This bridge is located in the asbestos section of Yaxi Expressway, with a total length of181m, a bridge width of 24.5m and a span of ***36. In addition to the shape of "Big Mac Roller Coaster", Ganhaizi Bridge has many innovative construction technologies, which make it occupy a place in highway bridges all over the world.
The most edited bridge
Four world firsts
The first longest concrete-filled steel tubular truss bridge;
The first high-rise concrete-filled steel tube lattice pier, composite pier and mixed pier;
The longest continuous structure of its kind;
Steel fiber reinforced concrete filled steel tube is applied to engineering for the first time.
technical characteristics
Full steel tube concrete structure
The main load-bearing component of the bridge is concrete filled steel tube or steel tube. The upper and lower chords of the main girder are made of concrete filled steel tubes, and the web members are made of steel tubes; Concrete-filled steel tube is used for the main limb of pier, and hollow steel tube is used for diagonal web members, parallel web members and cross braces.
Measures to increase stiffness
Taking the second joint as an example, the joint length 1045. 1 m, the pier of the second joint 15 ~ 26 and the pier of1~14 and the pier of 27 ~ 30 are conditionally released with longitudinal freedom; 2. Dimensions: longitudinal bridge gradient 1: 50, the maximum pier bottom width in longitudinal bridge direction is 7.8m, and the transverse bridge width is an integer, reaching 13m, with horizontal cross braces; 3. Structure: Whenever the pier height is more than 60m, a web plate is longitudinally arranged within 30m of the pier bottom height, and a "K"-shaped strut is transversely added.
Concrete filled steel tube pier
According to the different heights of piers, concrete filled steel tubular lattice piers and hybrid piers are adopted. Compared with the traditional concrete pier, the concrete-filled steel tubular lattice column pier has the advantages of mature construction technology, simple construction, small structural size, beautiful appearance and good wind resistance. The overall bearing capacity of concrete-filled steel tubular lattice columns can be divided into transverse and longitudinal bridge directions. In the field of engineering, concrete filled steel tubular lattice pier is adopted for the first time. For high piers, the composite pier composed of concrete-filled steel tubular column foot and concrete web is used for the first time, and it is mixed with lattice pier, which is called mixed pier for short.
The curved beam was dragged into place.
The length of the main girder of the whole bridge is 18 1 1 m, with pier 15 as the closing point for dragging in place. The ground earth tire main girder assembly site is designed at Ya 'an side abutment, and the support main girder assembly site is set between piers 28 -30 at Lugu side. After the main girder (double girder) is assembled, it will be dragged from both sides to pier 15 for closure, so as to realize the erection of the main girder.
The reaction device of the traction girder is a series of piers, and the slideway system is a curved slider. The minimum dragging unit length is 2× 44.5m, the maximum dragging unit length is 6× 62.5m, the minimum dragging walking curve radius is 356m, the maximum dragging walking pier height is107m, and the maximum dragging walking span is14m. The installation technology of main girder has realized the dragging installation and erection technology of curved girder (r = 356m), high pier (maximum pier height 107m) and multi-span (1 1 span), and explored the applicable technical ways of main girder erection under complex terrain conditions in mountainous areas.
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