Introduction of Jiahua Jialing River Bridge in Chongqing?

Chongqing Jiahua Jialing River Bridge spans the Jialing River and is the main link connecting the north and south of Chongqing. The bridge was designed by Shanghai Municipal Engineering Design and Research Institute and Chongqing Traffic Planning Survey and Design Institute. Construction started on February 29th, 2004 and was officially opened to traffic in June, 2007. Jiahua Bridge is a three-span prestressed concrete continuous rigid frame bridge with a length of 528m, a main span of 252m and a side span of 138m, which is symmetrically arranged. Two-way eight lanes, 65438+ 0.5m sidewalks on both sides. The road grade of this bridge is urban expressway, the design speed is 80km/h, the design load is first-class highway ... The channel standard is third-class channel, the navigation clearance height is 10m, and the width of main navigation hole is 180m.

The development of history

Jiahua Jialing River Bridge project mainly includes a two-way eight-lane Jiahua Jialing River Bridge and a prestressed concrete continuous rigid frame bridge with a main span of 252m; Hong 'en Temple and Daping are two two-way six-lane urban tunnels, about 800m long and 1500m long respectively, with 9 interchanges. The first phase of the project has a total length of about 4.35km and a total investment of about 2 billion yuan. Construction started at 65438 on February 29th, 2004, with a planned construction period of 3 years. The project was implemented by Chongqing Road and Bridge Co., Ltd. in BOT mode, designed by the consortium of Chongqing Design Institute and Shanghai Municipal Engineering Design Institute, undertaken by China Railway Eighth Bureau Group, and supervised by the supervision company of Chongqing Academy of Building Science.

Engineering generalization

Chongqing Jiahua Jialing River Bridge is a north-south expressway project reserved in Chongqing's master plan from 2000 to 2020, and it is also one of the eight popular projects.

According to the relevant person in charge, the Jiahua Jialing River Bridge project is planned to be implemented in stages. The first phase of the project starts from Yujiawan overpass of Yu He Expressway in Yubei District in the north and ends at Lijiatuo in Banan District in the south. Cross Jialing River to connect Huacun Interchange, Daping Tunnel and Huangshaxi Interchange, and connect with Caiyuan Road. The total length is 4.35 kilometers, in which the main bridge (including the approach bridge) is about 1000 meters, with 8 lanes in both directions. Moreover, this bridge deck width is unique among the bridges in the main urban area of our city.

The implementation of this project can not only alleviate the bottleneck problem of river-crossing traffic, but also solve the network connection between trunk roads, which plays an extremely important role in the road system of the whole main city. According to the person in charge of the project, the Jiahua Jialing River Bridge project * * * passes through five major districts: Yubei District, Jiangbei District, Yuzhong District, Jiulongpo District and Banan District.

Then, after the bridge is repaired, what convenience can it bring to the public? The person in charge of the project calculated an account for us: citizens of Renhe Town in Yubei District want to go to Lijiatuo in Banan District, and they can choose to take the bus from Renhe to Nanping and then transfer to Nanping to Lijiatuo to reach their destination. Plus the transit time, the journey takes more than two hours. However, after the Jiahua Bridge was completed and opened to traffic, the citizens traveled from Yubei District to Lijiatuo in Banan District at a speed of 80 kilometers per hour, which only took about half an hour.

Completed and opened to traffic

On the morning of June 16, 2007, Chongqing Jiahua Bridge was completed and passed. Jiahua Jialing River Bridge is a north-south expressway in the road network system of the main city. Today is the first phase of the project, which consists of "one bridge", "one tunnel" and "three interchanges". "One Bridge" is the first two-way eight-lane Jiahua Jialing River Bridge in Chongqing, with a main span of 252 meters, which is the widest in Asia. "One Tunnel" is a large-span two-way six-lane daping urban tunnel, the width of which is the first in the main city. The "three interchanges" are Liziping Interchange, Huacun Interchange and Huangshaxi Interchange.

architectural feature

1. Bridge superstructure

The superstructure of Jiahua Bridge is a single box and single room vertical web structure with variable cross section. The top width of single box is 17.8m, the bottom width is 9.8m, the flange plate is 4m long, the root beam height of box beam is 15.5m, which is the main span116.3, and the middle beam is 5m high, which is the main span 1/50, and the beam bottom is 650. The thickness of the web is changed from 100cm (fulcrum) to ~45cm (mid-span), and the size of each section of No.0 beam section of the main girder is appropriately increased. Variable thickness of bottom plate 1 10cm (fulcrum) 32cm (mid-span), indoor thickness of top plate box 30cm, cantilever end thickness 20cm and root thickness 55cm. Set a fulcrum diaphragm beam, the thickness of diaphragm beam at the top of pier No.0 is 100cm, and the thickness of diaphragm beam at the beam end is 150cm. The middle span is provided with a transverse partition of 40cm. No.0 block length 12m, cantilever construction beam section is divided into 3m, 3.5m and 4m, and closure section is 2m. The maximum pouring weight of cantilever casting is 350t, and C55 concrete is used for box girder. The top surface of box girder is provided with 2% one-way transverse slope, and the web is provided with exhaust holes.

The box girder adopts three-dimensional prestressed system. PE corrugated pipe and vacuum grouting technology are used for prestressed pipeline.

Block 0# is provided with transverse and vertical prestressed tendons at the partition and web. Shear prestressed steel bars are arranged in the closed section of the middle hole, and the middle is connected by connectors. In order to avoid unpredictable deflection, external prestressed holes and anchor pads are reserved for box girders.

The main girder is constructed by cantilever casting method with symmetrical hanging basket.

2. Bridge substructure

The main pier of Jiahua Bridge adopts thin-walled box single pier, which is rare in similar bridges in China. The main pier is made of C55 concrete. The width along the bridge is 7.0m, the width across the bridge (excluding the diversion tip) is 9.8m, and the wall thickness is 80cm and 100cm respectively. Both upstream and downstream are provided with water diversion ends. A partition board is arranged in the pier body, and an arc chamfer is arranged at the bottom of the pier. The side pier is made of C40 concrete, and its form is the same as that of the main pier. It is a single thin-walled pier with a width of 3.5m along the bridge direction and 9.8m across the bridge direction (excluding the diversion tip), and the wall thickness is 50cm and 60cm respectively. A partition board is arranged in the pier body. The pier is constructed by turnover formwork method.

technical innovation

(1) The pier of the main bridge adopts a thin-walled box pier which is rare in similar bridges in China. At the same time, water diversion points (anti-collision and diversion structures) are set on both sides of the pier, which are integrated with the pier.

(2) In order to overcome the structural cracks and beam deflection of similar bridges in China, various countermeasures are taken in design theory, technical measures and construction methods for effective control.

① High-performance concrete and concrete durability design are adopted, and scientific and systematic requirements are put forward for various parameters. Automatic shotcrete curing system is adopted in the construction to ensure the high quality performance of concrete.

(2) In order to cope with the unpredictable deflection that may occur, an external prestressing system is reserved for the box girder.

(3) Strict construction management and strict construction monitoring are implemented, and measures such as parameter sensitivity analysis technology, reasonable pre-camber setting, identification and correction of key parameters, and jacking measures before closure are taken to ensure that the completed bridge line shape and internal force state meet the design requirements. The average closure accuracy of the whole bridge is 4mm (6mm upstream and 2mm downstream).

(4) Optimize the hanging basket technology, and make many improvements to the force transmission system, anchoring system and walking system of the hanging basket to minimize the impact of temporary construction load on the permanent structure.

(3) Optimize the construction organization design and construction technology.

(1) In the middle of the river with a water depth of 3-5m and a flow velocity of 2m/ s, earth-rock cofferdams are used for construction, and reinforced cages are used to cut off the river in advance, so as to overcome the influence of scouring and stagnant water on the lateral pressure of the weir body; It has achieved ideal water-stopping effect and is a successful example in similar foundation construction.

(2) The cap adopts the one-time pouring technology of mass concrete (h=6.5m, V = 4,500m3), the internal temperature measuring system of "Yuhuan mass concrete one-way communication" and the thermal insulation and curing technology of warm water storage concrete, which ensures the pouring quality of mass concrete.

(3) Optimize the formwork technology, with the maximum cantilever casting weight reaching 322t and the maximum cantilever casting height reaching14.80 m..

④ A series of key technologies, such as cable-stayed truss trestle construction technology, high-performance pumping concrete technology and universal bar support system (about 60m high), were adopted in the construction.

Achievement honor

Jiahua Bridge is a gift project for the 10th anniversary of Chongqing's direct administration, with a total length of 4.35km, setting a new record for the construction of municipal highway traffic tunnels in China. The deck width of the main bridge of Jiahua Bridge is 37 meters, which is the widest in Asia.

Examples of thin-walled hollow flexible pier technology, high-quality concrete construction technology, high-precision closure technology and long-span beam bridge construction technology adopted by China Railway Eighth Engineering Co., Ltd. in the construction of Jiahua Bridge have been compiled into the book "Modern Bridges in China Facing Innovation" compiled by the Ministry of Communications, the Ministry of Construction and the Ministry of Railways, which has gone down in history.

In 2008, the project won the National Customer Satisfaction Construction Project in 2008, Chongqing Bayu Cup Quality Project Award, Chongqing Municipal Engineering Gold Cup Award and Sichuan Tianfu Cup Construction Project Gold Award.

Construction significance

The construction of Jiahua Jialing River Bridge not only alleviates the bottleneck of cross-river traffic, but also solves the network connection between trunk roads, which plays an extremely important role in the road system of the whole main city.

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