Witnessing the Infrastructure Madness - China Bridge (Guizhou Part 2)
Baling River Special Bridge
Large span steel truss girder suspension bridge
Baling River Bridge
Profile introduction
Located in The Chongqiu District of Plateau in Anshun City, Guizhou Province, the Baling River Bridge is the first mega-bridge spanning the Baling River Grand Canyon on the main route of the Shanghai-Rui National Highway. The bridge is a single-span steel truss stiffener suspension bridge with a main span of 1088 meters, with a total length of 1564 meters and a bridge deck to the water surface of the Baling River of 370 meters.
The length of the tunnel anchor on the west bank of the bridge is 74.34 meters, and the amount of gravity anchor concrete pouring on the east bank is 81662 cubic meters. The east tower is 186 meters high and the west tower is 201 meters high, and the terrain on both sides of the river valley is steep and undulating, with the river valley reaching a depth of 400 to 600 meters.
Unlike the three cable-stayed bridges introduced in the previous part, the Baling River Bridge is a single-span steel truss stiffener girder suspension bridge.
Construction technology, significance
It is the world's first case of using a large bridge deck crane in the canyon air to splice from the two banks of the canyon to the middle, which greatly shortens the construction period and reduces the cost, which can be described as killing two birds with one stone.
Improved traffic conditions The travel time between the two sides of the strait has been shortened from a few hours to 3 minutes.
Baling River Bridge in the mist
Clearwater River Bridge
The second tallest bridge in the world
The world's largest single-span plate truss combines a stiffener girder suspension bridge and a steel truss girder suspension bridge in Asia's first mountainous area.
The Qingshui River Bridge is a river crossing in Guizhou Province, China that connects Kaiyang County in Guiyang City with Yong'an County in Qiannan Buyi and Miao Autonomous Prefecture, located on the Qingshui River, and is one of the components of the Guiyang-Wong'an Expressway.
Qingshuihe Bridge starts from the Peace Tunnel in the north, crosses the Qingshuihe Gorge in the upper part, and reaches the Maoyun Interchange in the south, with a total length of 2174.1 meters, of which the main span is 1130 meters; the bridge deck is a two-way four-lane highway with a design speed of 80 km / h. The total investment of the project is 1.54 billion yuan, and the anchors on both sides of the strait are gravity anchors; the tower is a reinforced concrete frame structure, the height of the Tower on the Kaiyang Bank is 230 meters, and the height of the two Towers on the Bank of Wong'an is 236 meters and 220 meters respectively.
Pingtang Bridge
The Pingtang Bridge is a high-speed passage in Qiannan Buyi and Miao Autonomous Prefecture, Guizhou Province, China, located on the Grand Canyon of the Chudu River, and is one of the important components of the Yuqing-Anlong Expressway.
Pingtang Bridge starts from Tongzhou Interchange in the west, spans the trough river above the Grand Canyon, and east to the Tooth Boat Interchange; the total length of the bridge is 2135 meters, and the width of the main bridge is 30.2 meters; the bridge deck is a two-way four-lane highway with a design speed of 80 km/h.
On April 29, 2016, the construction of the Pingtang Special Bridge began, and the tower height of 332 meters will set a record for the "first" of the world's high concrete bridge towers, and the total investment of the Pingtang Bridge is expected to be 1.5 billion yuan.
The main structure of the bridge is a three-tower double-cable composite girder cable-stayed bridge with a main span of 2×550 meters, and the main tower tower is 332 meters high. It has become a landmark building in Guizhou.
Design concept
The Pingtang Bridge spans a thousand-meter valley, and the three bridge towers should adopt the same tower type, which is convenient for forming a landscape as a whole to match the mountain. In view of the fact that the façade of the plane bridge tower is relatively monotonous, in order to improve the overall stiffness of the structure and meet the needs of the force and the bridge landscape, the design adopts a rigid and stable, and at the same time has a more distinctive space diamond tower shape at the visual level, so that the bridge deck landscape is rich and integral, and the components are coordinated and unified, strong and powerful.
Construction difficulties
(1) The mechanism and force of the three-tower cable-stayed bridge and the more common ordinary double-tower cable-stayed bridge are quite different, specifically because there is no auxiliary pier and excessive pier dispersion weight and lateral thrust on both sides of the middle bridge tower, which cannot provide effective constraints on the midspan main bridge, and the overload impact of the structure is greater, resulting in the deflection of the main girder of the three-tower cable-stayed bridge, the stress amplitude of the cable-stayed cable and the bending moment of the base of the tower are much larger than those of the two-tower cable-stayed bridge.
(2) The height of the three towers of the Pingtang Bridge is about 300 meters, how to improve the stiffness of the structural system, control the fatigue stress amplitude of the cable-stayed cable, and meet the stress requirements of the tower beam cable is also the key to the design.
(3) The bridge is located near the Pingli River Scenic Area, the landscape requirements of the bridge are higher, and the bridge is a super high tower three-tower cable-stayed bridge, the stiffness of the bridge tower is higher, how to integrate the landscape design into the bridge tower structure design is the design focus and difficulty of the bridge.
Construction significance
The Pingtang Bridge provides a great reference for the long-span multi-tower cable-stayed bridge in the west. Shorten the passage time from Pingtang to Luodian from 2 and a half hours to 1 hour.
Red Maple Lake Bridge
Guizhou Hongfeng Lake Bridge is located in Guizhou Hongfeng Lake National First Class Scenic Nature Reserve, but also a karst development area, the safety, beauty of the bridge and its coordination with the environment put forward higher requirements, the use of a span of 185m single tower cable-stayed bridge scheme, is the first asymmetrical single tower double cable-faced prestressed concrete cable-stayed bridge in Guizhou.
The China Bridge-Guizhou chapter has ended and will continue to increase in the future.