Dongting Lake Bridge

Dongting Lake Bridge

Dongting Lake Bridge is a river crossing channel connecting Junshan district and Yueyanglou District in Yueyang City, Hunan Province, China. It is located on the Dongting Lake waterway and is a part of the urban trunk road in the northwest of Yueyang City.

The construction of Dongting Lake Bridge started on December 19, 1996;

The closure project was completed on August 18, 2000;

It was put into operation on December 26, 2000.

Dongting Lake Bridge starts from Jingming Avenue in the west, crosses Dongting Lake waterway in the East and ends at Dongfeng Lake in the East. The total length of the line is 5783.5m, and the total length of the main bridge is 5300m. The bridge deck is a two-way four lane urban expressway with a design speed of 60km / H.

Construction process

In August 1995, the third party meeting of Yueyang City was held, and Yueyang Municipal government decided to have relevant plans for the preparation of Dongting Lake Bridge.

On February 6, 1996, Hunan Provincial Planning Commission approved the construction of Dongting Lake Bridge; on December 19, the construction of Dongting Lake Bridge started.

In 1997, the project headquarters of Dongting Lake Bridge issued a notice to invite tenders for the architectural design of the bridgehead of Dongting Lake Bridge.

On August 18, 2000, the closure project of Dongting Lake Bridge was completed;

On November 27, Dongting Lake Bridge was completed; on December 26, Dongting Lake Bridge was opened to traffic.

On December 29, 2002, Dongting Lake Bridge passed the completion acceptance.

Bridge location

Dongting Lake Bridge is located in the northwest of Yueyanglou District, Yueyang City, Hunan Province, China. It starts from Jingming Avenue in Junshan District in the west, crosses Dongting Lake waterway, extends along Dongting avenue to Yueyanglou District in the East, connects Dongting North Road, and ends at the southeast of Dongfeng Lake.

Architectural design

building structure

Overall layout

Dongting Lake Bridge is composed of main bridge on water, east-west approach bridge, three pylons, piers and their interchange ramps. The main bridge section is arranged from northwest to Southeast.

 

Design concept

Dongting Lake Bridge is located at the throat of the four rivers of Hunan, Ziyuan, Lijiang and the Yangtze River flowing out of Dongting Lake and into the Yangtze River, so flood control is particularly important. According to the approval of the Yangtze River Water Conservancy Commission, the main and auxiliary openings of about 300 meters should be arranged in the main channel, and the large span should be adopted as far as possible. At the same time, the bridge is close to Yueyang Tower and Junshan Scenic Spot, and Yueyang City is a historical city In Huaming city and tourist resort, the structural form of the main bridge must be coordinated with the landscape of Yueyang Tower, Junshan and the vast Dongting Lake. Therefore, considering the factors of novel and beautiful bridge type, advanced technology and convenient construction in combination with the natural conditions and flood control requirements, the three tower cable-stayed bridge scheme with better economic index and novel and beautiful bridge type is finally selected.

 

Design features

The main control of the main bridge of Dongting Lake Bridge is unequal height three tower prestressed concrete cable-stayed bridge, with double inclined cable plane arrangement and longitudinal floating system; the cable tower adopts inverted Y-shaped gem shaped reinforced concrete tower, and the tower body and cross beam adopt No.50 prestressed concrete hollow section; the main beam adopts integral slab section and adopts No.50 prestressed concrete integral cantilever casting. The double inclined plane cables are fan-shaped, the stay cables are protected by hot extruded PE casings and cold cast headed anchors. The bearing platform of cable tower is an integral structure. The East Bank of the auxiliary hole of the main bridge is No. 50 prestressed concrete continuous launching beam, the upper structure is single box single chamber inclined belly bench section box beam, and the lower structure is No. 30 reinforced concrete double column pier. The auxiliary West Bank of the main bridge is located at No. 50 prestressed concrete simply supported T-beam, in which the substructure is double column pier, the capping beam adopts T-section and No. 40 prestressed concrete.

 

Design parameters

The total length of Dongting Lake Bridge is 5783.5 meters, including 5300 meters of bridge, 1880 meters of main river crossing bridge, 3420 meters of auxiliary span bridge and 480 meters of approach bridge. The middle tower is 127.49 meters above the top of the bearing platform, the side tower is 98.23 meters above the top of the bearing platform, the anchorage wall thickness of the tower body is 120 cm, and the rest are 80 cm; the middle tower is 5.5 meters wide along the bridge, 8.0 meters wide at the root, and 35 meters high at the transfer anchorage column; the side tower is 5.5 meters wide along the bridge, 7.5 meters wide at the root, and 25 meters high at the transfer anchorage column. The main beam is 23.40 meters wide, the two main ribs are 250 cm wide, 200 cm high, and the plate thickness is 32 cm. The standard cable distance on the tower is 1.50 m, and that on the beam is 8 m. There are 22 pairs of cables on each side of the middle tower and 16 pairs of cables on each side of the side tower. There are 111 pairs of cables in the whole bridge. The cables are made in China with a diameter of 7 mm low relaxation galvanized high strength steel wire, and the standard strength is 1600 kPa.

 

Equipment and facilities

Traffic monitoring

From March 19, 2019, the Dongting Lake Bridge will be equipped with electronic police to capture the illegal behaviors of large trucks violating the ban signs.

 

Lighting facilities

Landscape lamps are installed on the tower of Dongting Lake Bridge, and red landscape lamps are set on the top of each tower. At the same time, a long pole street lamp is set on the bridge deck every certain distance.

 

Operation

Fare system

On May 1, 2009, the toll system of Dongting Lake Bridge was cancelled and the whole bridge was free of charge.

 

Traffic matters

According to the Circular of Yueyang Municipal People's Government on strengthening the management of Dongting Lake Bridge (yuezhenggao No. 2) in 2010, the following provisions are made on the driving vehicles of Dongting Lake Bridge:

1. It is forbidden for overload vehicles to pass through Dongting Lake Bridge; inflammable, explosive and chemical dangerous goods transport vehicles passing through the bridge must first apply to the municipal Dongting Lake Bridge Administration Bureau for approval and take corresponding safety protection measures before passing.

2. Tracked vehicles, iron wheeled vehicles, animal powered vehicles and vehicles that may damage the road surface of the bridge and affect traffic safety are prohibited to drive on the bridge.

 

Construction achievements

Technical problems

construction technique

Dongting Lake Bridge is located in the special geographical environment at the junction of Dongting Lake and the Yangtze River. The wind is strong, the wind and rain co-exist for a long time, and the intersection angle between the main wind direction and the bridge axis is 0 Since the bridge was completed and opened to traffic, there have been many times of strong wind rain vibration, the most serious is the unilateral amplitude of more than 40 cm, which seriously affects the safe operation of the bridge and the service life of the cable. Therefore, the variable damping characteristics of magnetorheological damper are applied to control the wind rain vibration of the cable in Dongting Lake Bridge It effectively solves the problem of rain wind vibration

1. The damping coefficient of the passive damper is constant, and it is impossible to have a good effect on each cable and the vibration of each order of the cable; while the damping coefficient of the MR damper can be adjusted according to different needs through the external DC voltage, so as to achieve the semi-active control of the cable vibration and achieve the optimal damping effect.

2. MR damper has a good effect on restraining the vibration of cable (such as wind and rain vibration). It is economical and practical in price, and is worthy of promotion.

 

technological innovation

1. The basic performance of multi tower PC cable-stayed bridge is studied systematically for the first time. A set of effective methods to improve the overall stiffness of multi tower structure and reduce the stress amplitude of tail cable are explored. The multi tower PC cable-stayed bridge structure without stable cable and auxiliary pier is first realized in China.

2. This paper puts forward the forward iteration method for determining the reasonable construction state of multi tower PC cable-stayed bridge and the optimization method for determining the reasonable completion state of the bridge.

3. In China, the forced vibration method for determining flutter derivative of bridge in wind tunnel test is first realized, which makes a creative contribution to the wind tunnel test technology of bridge in China and greatly improves the accuracy of flutter derivative measurement. At the same time, a new generation of aerodynamic derivative identification software with self checking and mutual checking functions is developed.

4. It is the first time in China to carry out quantitative observation and Research on cable vibration, and successfully develop and install the world's first cable damping system using modern magnetorheological control technology. The system can make every cable in the best vibration reduction state, which opens up a new effective way for cable vibration reduction. Magnetorheological damper is similar to the general hydraulic damper, but its working fluid is magnetorheological fluid. It can change the viscosity of magnetorheological fluid by applying DC voltage, so as to change the damping coefficient of the damper and suppress the rain wind vibration of the cable.

5. A series of construction and control technologies adapted to the structural characteristics of multi tower cable-stayed bridge have been developed, including a new generation of front fulcrum hanging basket equipped with spatial rotating anchor seat and horizontal thrust device, deep-water high pile drilling platform, large underwater casing construction technology, construction control technology based on artificial neural network (ANN), etc.

6. A complete set of C60 high performance concrete technology was developed. It is the first time that C60 high strength concrete is applied to such a large-scale cable-stayed bridge in China.

 

Honorary recognition

Value significance

Dongting Lake Bridge is a magnificent cultural landscape, which is closely related to Yueyang Tower, Junshan, Dongting Lake and other famous scenic spots

Chinese PinYin : Dong Ting Hu Da Qiao