building material
Name of Bridge: Chongqing Dafosi Yangtze River Bridge
Bridge type: concrete cable-stayed bridge with twin towers and double cable planes.
Span: 450 meters
Bridge address: Chongqing
Design unit: Chongqing Communications Research and Design Institute
Construction unit: Chongqing Bridge Engineering Company of China Railway Bridge Bureau Group
Cement dosage: 12 1830m3.
Steel consumption: 15870 tons
Cost: 3,296,543.8 million yuan.
Completion date: 20065438+0 65438+February
Brief introduction of bridge
The Great Buddha Temple Yangtze River Bridge is the most important control project in Chongqing, Guizhou and expressway. Chongqing dafosi Yangtze river bridge is located about five kilometers downstream of Chongqing chaotianmen wharf. 1997 1 1 started construction and was completed and opened to traffic in 2002 1. The cost of the bridge is more than 200 million yuan, and the design task is independently undertaken by Chongqing Jiaotong University. The chief designer is Professor Liu Yuxiang, a senior engineer. The total length of the bridge is 1 168m, with a deck width of 30.6m and six lanes in both directions. The main bridge is a cable-stayed bridge with twin towers and double cable planes, with a span of 198+450+ 198m. The maximum height of the main pier tower is 206.68 meters, the main span of the bridge is 450 meters, and there are 55 pairs of stay cables on both sides of each tower. The cable spacing is 8. 1m (excluding side stays), and the inclined angle of stay cables is 2716' ~ 80 27', ranking first among similar bridges in China.
main feature
The dafosi bridge in traffic is the first Yangtze River bridge in the lower reaches of the main city, connecting the north and south banks of the Yangtze River in the east of Chongqing, forming a fortress on the Chongqing inner ring road and the Chongqing-Guizhou line, and is the largest control project on the main line of the national highway from Chongqing to Zhanjiang. At the foot of the Yangtze River Bridge, the Great Buddha Temple is an important container port in Chongqing and the largest beach in the upper reaches of the Yangtze River. The downstream 10 km of the Yangtze River Bridge of the Great Buddha Temple is the well-known Guojiatuo Ro-Ro Port. From here, Chongqing products are transported to all parts of China and overseas through the Yangtze River Golden Waterway. Materials from all over China also enter the Chongqing market continuously through here.
The Big Buddha Temple Bridge under construction stands out. Bridge length 1 168m, deck width 30.06m, two-way six lanes. The bridge type is prestressed reinforced concrete cable-stayed bridge with twin towers and double cable planes. The tower of this bridge is 206 meters high and the main span is 450 meters, ranking second among similar bridges in China at present.
At the north bridge head of the Yangtze River Bridge in the Giant Buddha Temple, the "covered bridge waterfront" of Jinke Real Estate faces the riverside bridge, which is gorgeous and attractive, and it is an out-and-out Yangtze River scenic room; Next to the north approach bridge of the Great Buddha Temple Yangtze River Bridge is the real estate community of Luneng Real Estate; The left bank of the Yangtze River Bridge in the Big Buddha Temple, on the Tazi Mountain, seems to be closely related to the White Pagoda in Beihai Park; The Great Buddha Temple Yangtze River Bridge and the White Pagoda together constitute the first landscape and sign of the Yangtze River going up and entering the main city of Chongqing.
bridgework
The Dafosi Bridge is a prestressed concrete cable-stayed bridge with twin towers and double cable planes floating system, with a total length of1168m and a main span of 450m. There are 55 pairs of stay cables on both sides of each tower, with a cable spacing of 8. 1 m (excluding side braces), and the inclination range of stay cables is (2716'). Floating system.
The approach bridge is a prestressed reinforced concrete T-shaped simply supported beam bridge. Cable-stayed hanging basket cantilever casting is adopted for the main bridge.
When the magnificent Chongqing Giant Buddha Temple Yangtze River Bridge was opened to traffic, it set a new record for similar bridges in Asia, and Comrade Jiang Zemin wrote the name of the bridge himself.
work progress
1998 started and 200 1 completed. Won the Luban Award of China Construction Engineering. It was built by China Railway Bridge Bureau Group Co., Ltd. and Chongqing Bridge Engineering Corporation.
The domestic advanced climbing formwork construction technology is used to solve the construction problem of high tower, and the advanced light hanging basket with small lifting and small falling truss and construction control technology are used to solve the construction problem of cast-in-place concrete with long cantilever of main girder. In addition, in view of the difficulties in the construction of 1# block, the closure of side spans and the installation of large-tonnage stay cables, a set of advanced cable-stayed bridge construction technologies has been formed. The Yangtze River Bridge of Chongqing Giant Buddha Temple is the largest bridge on the expressway of Chongqing, Guizhou and the most important control project. The bridge has high technology content and great technical difficulty.
On the north bank of the Great Buddha Temple Bridge, the rocks stand tall and the mountains are continuous. Several fish ridges in the riverbed on the north shore stretch for hundreds of meters along the river, either hidden or present, with the fluctuation of the river. The pier of the north main tower is on the "fish ridge" on one side of the main channel, more than 300 meters away from the north bank. Roads are impassable, boats are difficult to travel, and even electricity is rural electricity. On the other side is Chongqing Road and Bridge, an important place in the bridge construction industry. The main pier on the south bank is only 30 meters away from the shore, and several trestles reach the main pier directly.
Influenced by many factors such as hydrology and geology, bridge foundation construction is the key control process of the whole bridge. Its construction progress and engineering quality directly affect the realization of the scheduled construction period of the whole bridge, not to mention the construction of the bridge on the Chuanjiang River with complex geology and rapid water depth. After careful organization and repeated argumentation, the construction scheme of beach filling and road construction is adopted, and it is determined to grab the pier foundation of the main tower in the dry season to ensure the continuity of the main tower construction. The pile foundation at the pier adopts drilling and excavation method, and the soil and sea are combined. The underwater pier pile foundation was completed in more than three months, and the dry season is coming to an end. 4,000 cubic meters of concrete for the main tower pier was poured at one time. In order to ensure the success of one-time grouting and prevent the hydration heat crack of mass concrete, the concrete formula was optimized through many experiments, and low hydration heat slag cement was used and fly ash was added. The cooling water pipe is embedded in the pile cap, and the thermal insulation and moisture protection layer covers the pile cap. On March 28th, before the spring flood, the bearing platform of the main tower pier of Chongqing Dafosi Yangtze River Bridge was successfully poured, setting a new record for pouring mass concrete in the history of bridge construction in China.
The main tower of this bridge is built with climbing formwork. The construction of the main tower was completed safely and with high quality. In the construction of the main girder, the "Big Mac" cable-stayed hanging basket was designed, and the main girder with a width of 30.5 meters and a length of 8 meters was poured at one time. The hanging basket adopts the method of vertical cable on the tower, which minimizes abnormal deformation and ensures the linear smoothness of the main girder. The hanging basket adopts bolt truss structure and is manufactured in blocks, which ensures the accuracy of manufacturing and installation. In particular, the new technology of small lifting and small lowering is adopted, that is, when the bracket is supported by formwork, the bracket truss beam leaves the beam body slightly, and the clapboard and bottom die in the beam body descend to the top surface flush with the bottom surface of the beam body again, so that it can walk, avoiding hundreds of tons of bracket truss beam from moving forward after lifting 3 meters, eliminating unsafe factors, and laying the foundation for the construction of "Big Mac" super-large hanging basket. According to experts' argumentation, structurally, the 30-meter-wide main girder on the north main tower is poured at one time, which is better than the left and right sides of the main girder on the south main tower.
The upper beam slab of No.4 main tower pier is 3 1m, 8m wide and 6m high, with more than 200 tons of steel bars and 800 cubic meters of concrete, which are poured twice. There are also many technical problems in the construction: first, the deformation of the upper beam construction support is as high as 55 meters; Second, the relative deformation of tower beam during concrete pouring; Thirdly, formwork, steel bar and prestress system. Cableway 0 requires high installation accuracy. In order to overcome these difficulties, a series of technical measures have been taken. For example, the weight supported by the upper beam structure requires 700 tons of pressure. If weighted in kind, the workload is heavy and the loss of construction period is immeasurable. Technicians skillfully adopted the prestressed weighing method, and completed the large tonnage weighing task simply and effectively. Pier 4 is the control project of the whole bridge, and the main tower pier must be taken out of the flood line of 185 meters safely and with high quality before the flood comes. Under the condition that mechanical equipment can't enter the site, island cofferdam construction is adopted, and 7500 cubic meters of earthwork is excavated manually. The 3-meter-diameter 15 bored pile is changed into a 3.8-4.8-meter-diameter variable-diameter digging pile, and the onshore concrete plant is changed into an aquatic concrete plant to ensure the smooth construction. During the concrete construction of the super-large cap of Pier No.4, it was considered in advance and organized scientifically. It took only 1 10 hour to pour 4000m3 of concrete at a time, which set a new record in the history of bridge construction in China. During the pouring construction of No.0 block of No.4 main tower pier, the project department specially formed a technical research team with the project manager and chief engineer as the main members, conducted a thorough and scientific construction organization, and specially compiled the construction technology and operation procedures of No.0 block; Technical clarificaiton for many times, so that all the technicians and construction personnel involved in the construction know fairly well.
The successful application of silica fume concrete is a highlight of technical innovation of bridge project department. Silica fume concrete has the characteristics of easy pouring, compactness, non-segregation, long-term stability, high early strength and high durability. However, the technology is high and difficult. In order to ensure the quality of bridge engineering and produce high-quality concrete, the project department has given strong support to the site laboratory from the aspects of people, money and materials since the beginning of construction, and set up a special research group on the new technology of preparing high-strength and high-performance concrete with micro-silica powder. After nearly half a year's hard and meticulous work, we finally solved a series of technical problems, screened out the excellent technical and economic mix ratio, and passed the appraisal of the owner and supervision expert group. The successful application of this new technology not only ensures the construction quality and structural durability of the Big Buddha Temple Bridge, but also fills a gap in the bridge construction history of the company and the southwest region.
technical innovation
(1) Large cable-stayed bridge adopts large tonnage (pressure 2200t, tension 300t, displacement (up to 1 120mm) tension and compression bearings.
(2) Large-diameter variable cross-section pile foundation with maximum diameter of 4.8m is adopted for large-scale cable-stayed bridges. Shorten the construction period and ensure the foundation construction is completed in dry season.
(3) In large cable-stayed bridges, the design method of partial prestress is adopted. On the premise of ensuring the quality, less prestress is used, which saves a lot of materials and reduces the cost.
(4) In the long-span prestressed concrete cable-stayed bridge, the design method of one-time cable adjustment is adopted.
(5) The super-large cable-stayed bridge is constructed with the largest double cantilever for the first time, and the maximum length of the double cantilever is 19 1.2m, which is the highest of its kind at that time.
(6) The closure design of side span is based on the tail beam consolidation model for the first time.
(7) The design method of 8cmSMA pavement without planing layer is adopted for the first time. On the premise of ensuring the construction quality, this method reduces the construction links and shortens the construction period.
For more information about bid writing and improving the winning rate, click on the bottom customer service for free consultation.