2065438+May, 2006 1 day, after nearly five years of construction, the largest steel box girder suspension bridge in Asia-Yunnan Longjiang Bridge was officially opened to traffic.
Construction background
Baoteng Expressway passes through Gaoligongshan fault zone, with high seismic intensity, volcanic landforms along the way, high mountains and deep valleys, and difficult construction. Longjiang Bridge is the key project of Baoteng Expressway and the first super-long-span steel box stiffening girder suspension bridge in Yunnan Province. Due to the complex technology, the key technology research of the 1,000-meter suspension bridge in Yunnan strong earthquake mountainous area is listed as the science and technology project of western traffic construction, and the bridge is listed as the pilot project of highway construction informatization in Yunnan Province.
Located in the mountainous area with high intensity and frequent strong earthquakes, the geological conditions on both sides of the river are complex, the slope stability treatment is difficult, the seismic design standard of bridges is high, and the seismic system design is complex. The bridge adopts gravity anchorage structure, which is the first time in China to adopt this anchorage form in fully weathered basalt area.
work progress
Important node
On May 23rd, 20 1 1, the Longjiang Bridge project of Baoshan-Tengchong Expressway in Yunnan Province, which was undertaken by the Second Public Security Bureau of China Communications and South China Engineering Co., Ltd., was officially implemented.
Construction started on August 5, 20 1 1.
At 9: 00 am on June 265438+1October 2 1 and June 20 13, the concrete pouring of the right cap of the main pier of Baoshan Bank of Longjiang Bridge was completed, which marked the completion of the concrete construction of the main pier of Longjiang Bridge and laid the foundation for the next tower construction. The bearing platform of the main tower of the bridge is a dumbbell-shaped structure with a length of 2 1.4, a width of 2 1.4m and a height of 6m. C40 concrete is adopted, and the designed concrete volume is about 6308.2m3, which will be poured in two stages.
On April 20 13/morning of kloc-0/6 1, the first floor of the right picture of the anchor block of Longjiang Bridge was poured, with a pouring area of 1300 square meters and a volume of more than 2,700 square meters. The anchorage of Longjiang Bridge is gravity anchorage. The excavation amount of anchorage foundation pit is more than 500,000 cubic meters, and the basement area is about 6,300 square meters. The main concrete structure of the anchorage is 88 meters long, 52.9 meters wide and 44.638 meters high, with more than 90,000 pieces of anchorage concrete and 2,666 tons of steel bars.
2065438+May 2005, 338 659,000-meter cable strands on the left and right sides of Longjiang Bridge were all erected, 57 days ahead of schedule.
On July 30th, 20 15, the first steel box girder of Longjiang Bridge slowly left the ground on the bank of Tengchong Tower and moved to the predetermined position in the center of the bridge at a speed of 6 meters per minute. Four hours later, the first steel box girder was correctly placed in the predetermined position. At this point, the successful hoisting of the steel box girder in the first section of Longjiang Bridge marks that the bridge has been fully transferred to the construction of the important key process of engineering construction (the installation of the steel box girder, the main component of the upper part). According to reports, after the bridge is opened to traffic, Baoshan to Tengchong will realize the whole high speed, and the driving time can be saved by half an hour.
On April 20th, 20 16, after nearly five years of construction, Longjiang Bridge in Yunnan, the largest steel box girder suspension bridge in Asia, was officially opened to traffic.
construction unit
The Second Company of China Communications Second Bureau is responsible for the construction of Bid A of Longjiang Bridge, mainly including the installation of the superstructure of the main bridge (main cable saddle, loose cable saddle, main cable, cable clamp, sling, steel box girder, etc.). ), cable tower, anchorage, approach bridge and subgrade works on the shore of Baoshan. Zhongjiao Luqiao South China Engineering Co., Ltd. is responsible for the construction of bid B of Longjiang Bridge, mainly including Tengchong bank tower, anchorage (about 9 1W mass foundation pit excavation), approach bridge and subgrade engineering.
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