brief introduction
Yiling Yangtze River Bridge, located in Yichang City, Hubei Province, is an urban bridge that spans the Yangtze River and connects the north and south banks of Yichang. Construction started on June 28th 1998, 165438+, and was completed and opened to traffic in February 2006, with a total investment of 6 1 10,000 yuan. The bridge site is located about 7.6 kilometers downstream of Gezhouba Dam, with a river width of about 800 meters and a maximum water depth of about 23 meters ... Combining with the specific conditions of the waterway at the bridge site, the construction is bold and innovative, and the scheme of single cable plane and three towers cable-stayed bridge is put forward for the first time. Its main span of 2×348m is the first in China and the first in the world among similar bridges.
Engineering characteristics
load
Automobile-Super Class 20, the main bridge is the first single-plane prestressed concrete three-tower cable-stayed bridge in China, with a span (m) of 38+38.5+43.5+2x348+43.5+38.5+38. The inverted Y-shaped main tower is about 126 meters high, and the steel strand stay cable and concrete main Liang Kuan are about 23 meters high ... It is fortified according to the basic earthquake intensity of 7 degrees. There are four motor vehicle lanes on the bridge deck, with sidewalks 2.0m wide outside each lane, and the cable zone in the middle of the bridge deck is 3.5m wide.
structure
16 bored piles with a diameter of about 2m are used in the tower foundation, each pile is 42.0m long, the cap size is 16m × 16m, and the side tower foundation is 1 1 bored piles with a diameter of 2.0m, with a pile length of 44.0m in the north tower and 34.0m in the south tower. The upper part of the tower adopts inverted Y-shaped structure. The three towers are different in height, while the side towers are the same in height. The longitudinal dimensions of the side tower and the middle tower are 5.5m and 7m respectively.
Stay cables are arranged in the center of the bridge deck, and each stay cable on the section is composed of two stay cables with the distance of1.2m. The distance between the beam and the side span is 8m and 5.5m, and the distance between the towers is about1.6m. Each tower is equipped with 18 pairs of stay cables, and the middle tower is equipped with 32 pairs of stay cables, totaling 236 stay cables. Stay cables adopt parallel steel strand cable system, which is fully enclosed and unbonded. The diameter of a single steel strand is 15.24mm, and the galvanized steel strand is covered with PE sheath and filled with oily wax. Steel strand strength = 1770MPa, allowable stress [σ]=0.45. The total weight of stay cables is 1225t.
technology
In the design and construction, "new technology, new materials, new technology and new equipment" are actively adopted, and many new breakthroughs have been made in bridge construction technology.
1. The scheme of cable-stayed bridge with three towers and single cable plane was put forward in time. The scheme covers two large-span navigable waters, with good navigation conditions, construction and installation costs of 654.38+65 billion yuan, and remarkable economic benefits.
2. The side span adopts porous continuous structure to improve the stiffness of the three-tower cable-stayed bridge. The technical difficulty of solving the stiffness of the three-tower system is lower than that of the two-tower scheme, and the structural system is reasonable, and the scheme is feasible and economical.
3. Diamond-shaped pylon structure. The bridge tower has the advantages of reasonable stress, strong impact resistance, simple construction and novel shape, which realizes the harmonious unity of stress, beauty and economy.
4. A set of mature calculation program and monitoring technology are adopted in cantilever assembly of main girder, so that the cable-stayed bridge can successfully close two main spans at the same time with high precision without taking any compulsory measures.
5. The closed beam of cable-stayed bridge adopts two forms: inner beam and outer beam. After studying the mechanical behavior of external beam in detail, the design idea and a set of anchorage details of external beam are put forward, which opens up a new idea for bridge design.
6. Created the world record of the longest precast assembly of prestressed concrete box girder segments. The main girder is constructed by segmental prefabrication and assembly method, which achieves the effects of easy quality assurance, fast construction speed, short construction period and low investment. Its assembly span of 348 meters is the largest in the world, and the total length of the largest double cantilever bridge is 383 meters, without precedent.
7. Adopt a new fully enclosed copper stranded cable system with more technical advantages. The system has the characteristics of high accuracy of cable force establishment, convenient construction, no need to equip with large lifting equipment, excellent anti-corrosion performance and convenient replacement.
8. Developed an advanced lightweight multifunctional walking hydraulic control cantilever crane with a dead weight of 34t. It is convenient to advance through the cable area, with stepless speed change and small lifting impact. After lifting, the beam block can move back and forth by 50cm, which is convenient for alignment and adjustment with six degrees of freedom.
9. A set of special tools was made by ourselves, and the new threading technology of long steel strand of main girder was improved.
Engineering advantage
Yiling Yangtze River Bridge is unique in the history of bridge construction in China because of its novel design, exquisite structure, high technology content and low engineering investment. In many ways, this bridge represents the development direction of bridge construction today.
Yiling Yangtze River Bridge starts from Yichang Stadium Road in the north and crosses Yayi Railway, Dongshan Avenue, Yiling Avenue and Jiang Yan Road in turn along Shengli Third Road in the south. After crossing the Yangtze River, it is connected with Jiangnan Avenue in wulong village, a military area command.
Winning record
In 2002, he won the "Luban Award".
In 2004, he won Zhan Tianyou Cup.
Management and maintenance
In June 2009, Yichang Yiling Yangtze River Bridge Company set the best record for bridge maintenance and management in China, and the main deck was intact for 8 years, which is very rare in the national bridge system.
On June 20 1 1 or so, the damaged pavement on the south bank of Yiling Yangtze River Bridge was repaired. For the safety of drivers coming and going, the construction party set up a sign with a speed limit of 5 kilometers in the construction area.
dependent event
Enable "Vehicle Weighing System"
Yiling Yangtze River Bridge aims to build a "century-old peace bridge". Since July 2007, a vehicle weighing system has been installed to restrict the passage of overweight vehicles that endanger the safety of the bridge and ensure that the century-old foundation of the bridge is "as stable as Mount Tai". This kind of vehicle weighing system mainly restricts overweight vehicles from passing through the bridge, and the overloaded vehicles that really need to pass through can pass through the way of shunt and load sharing.
Install anti-collision facilities
On February 20, 2008, the meeting of the Standing Committee of Yichang Municipal Committee decided to install anti-collision facilities for the bridge during the year, and dismantle pier 1-4 upstream of the bridge in advance; Before the flood season, the barge "Oriental Pearl" was towed away from the scene, and the Maritime Safety Administration, the Port and Shipping Bureau and the Transportation Bureau were ordered to be specifically responsible for the implementation. If the owner of the ship fails to show up for a long time, it shall be forcibly towed away according to law; Cancel other operating docks within the scope of Daqiao 1200m within 2 years; For the upstream wharf without relocation task, it is necessary to implement safety responsibilities and increase facilities; Strengthen publicity, education and tips, enhance the safety awareness of dock and port personnel, and ensure foolproof.
On October 30th, 2065438+2003165438+/KLOC-0, the anti-collision construction project of the main pier of Yiling Yangtze River Bridge was officially started, and the No.4 pier of Jiangzhong Waterway Bridge was surrounded by anti-collision piers. The new "anti-collision suit" is designed according to the impact force of 5000-ton ships, which will completely solve the safety hidden trouble that has plagued Yiling Yangtze River Bridge for many years.
Drop the charges
20 1 1 12, 14, Yichang municipal government issued mayor's decree 154, canceling 20112,25 [14]. In order to prevent the hidden dangers caused by the surge in traffic volume after free passage, the bridge will ban vehicles with a total weight of more than 30 tons, with a speed limit of 60 kilometers for small cars and 40 kilometers for large cars. In addition, an overload control station will be added at the bridgehead in the south of the Yangtze River, and a video surveillance and overspeed capture system will be installed on the bridge. It is planned to install sound insulation and noise reduction facilities in the residential area near Jiangbei Bridge.
201165438+February 24th, the bridge toll was terminated. According to statistics, since the toll of the bridge was cancelled, the traffic volume has increased by about 1.5 times, the vehicles of vegetable farmers have increased, and the social vehicles from Yichang City, Zigui, Changyang and Enshi have increased. It turned out that with the cancellation of the toll station of the bridge, the driving distance from Yidu and Changyang to Yichang was shortened to 1 hour, while it took only half an hour from Yichang to Zigui and half an hour from Yichang to Enshi.
Canceling the bridge toll is only the first step for Yichang to implement the development of the south of the Yangtze River. With the dream of building a "modern megacity suitable for living, traveling and working", Yichang will fully implement the development to the south and across the river. What excites Yichang people is that the Miaozui Yangtze River Bridge, the second Yangtze River bridge in the urban area, is about to be completed, truly stringing together the urban pattern of "one river and two banks".
Speed limit increase
20 13,18 On May 8, the reporter learned from the traffic police brigade of Dianjun that the speed limit of small motor vehicles in this section was increased from 60 km/h to 70 km/h, and the speed limit of trucks was increased from 40 km/h to 50 km/h.
Hu Junfeng, the squadron leader of the traffic police brigade of the stronghold troops, said that there are four reasons for speeding up: First, the safety conditions of the Yiling Yangtze River Bridge and its surrounding connecting roads have been greatly improved compared with the past, and the traffic safety facilities are complete, which meets the requirements for speeding up; Second, the number of motor vehicles in urban areas has exceeded 6.5438+0.5 million. Before the speed increase, the daily traffic volume of Yiling Yangtze River Bridge was 90,000, and it is expected to increase to at least 654.38+0. 1.00 million after the speed increase. Yiling Yangtze River Bridge is the main channel for troops to enter the central city, and speeding up will undoubtedly greatly improve the traffic capacity and ensure smooth flow. Third, in order to meet the needs of smooth engineering and civilized city construction; The fourth is to build an efficient and fast Yichang.
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