Guozigou Bridge

As the first cable-stayed bridge and the tallest bridge in Xinjiang, Guozigou bridge is the largest and most important bridge in Xinjiang, and also the first highway steel truss cable-stayed bridge in China. It integrates new technology, new structure, new technology and new equipment, which is a major breakthrough in the history of highway construction in Xinjiang. It is the first time in Xinjiang to use domestic leading technologies such as mass concrete temperature control technology, tower beam asynchronous construction technology, hydraulic climbing membrane, self-propelled mobile formwork, which has accumulated valuable experience for mountainous expressway construction.

After the project is completed and opened to traffic, it will solve the problem of travel difficulties in the Ili Valley, and make the Ili Prefecture direct access to Urumqi all day, which is of great significance to the stability and economic development of the border areas.

In the design and construction of the bridge, the environmental protection concept of "minimum damage and maximum recovery" is adhered to. While overcoming the influence of frequent geological disasters on traffic, the environmental protection recovery work is carried out at the same time of construction. The bridge body and the beautiful scenery of Guozigou are integrated, which will add another beautiful scenery line to Guozigou national scenic spot.

Guozigou Bridge

Guozigou bridge is a highway in Xinjiang Uygur Autonomous Region of China. It is located on Guozigou gorge. It is one of the main components of Lianyungang Horgos highway and an important livelihood project in Xinjiang.

The construction of Guozigou bridge started on August 16, 2006;

The closure project of the main bridge was completed on August 28, 2010, and the whole bridge was connected;

It was put into operation on September 30, 2011.

Guozigou bridge starts from mengqiongkule in the north, crosses Guozigou gorge in the upper, and ends at jiangjungou tunnel in the south. The total length of the line is 4.4km, and the length of the bridge is 700m. The bridge deck is a two-way four lane Expressway with a design speed of 80km / h.

Construction process

On August 16, 2005, the Ministry of ecological environment of the people's Republic of China approved the environmental impact report of Sailimu Lake guozigoukou expressway project, including Guozigou bridge.

On August 16, 2006, the construction of Guozigou bridge started, and the commencement ceremony of the bridge was held.

On June 24, 2007, the first pile foundation of No.1 Main Tower of Guozigou bridge was poured; on August 22, the pile cap of Guozigou bridge was poured.

On June 30, 2009, the main tower capping project of Guozigou bridge was completed.

On August 28, 2010, the closure project of the main bridge of Guozigou bridge was completed, and the whole bridge was connected.

On September 18, 2011, Guozigou bridge completed the deck asphalt paving work;

On September 30, the Guozigou bridge was opened to traffic.

On August 30, 2012, Guozigou bridge passed the completion acceptance.

On July 29, 2016, the load test of Guozigou bridge was completed.

On July 28, 2017, the static and dynamic load tests of Guozigou bridge were carried out.

On September 11, 2018, the pavement reconstruction project of Guozigou bridge was carried out.

Bridge location

Guozigou bridge is located in Huocheng County, Yili Kazakh Autonomous Prefecture, Xinjiang Uygur Autonomous Region, China. It is located at the intersection of Guozigou and jiangjungou, and in the Guozigou scenic spot in the west of North Tianshan Mountain, Xinjiang. Its bridge deck is about 180 meters away from the bottom of the valley. The bridge starts from mengqiongkule in the north, crosses Guozigou gorge in the top, and ends at jiangjungou tunnel in the south, passing through Lianyungang Horgos Expressway < I (national highway) High speed (G30) < / I.

Architectural design

building structure

Overall layout

Guozigou bridge is composed of main bridge, main bridge, two pylons, stay cables and approach bridge, and the main bridge section is arranged from southwest to northeast.

 

Design features

Design parameters

The line of Guozigou bridge is 4.4km long, and the bridge is 700m long. It adopts (170 + 360 + 170m) span layout, in which the main span is 360m, the cable distance on the beam is 12M, the cable distance on the tower is 2.1m, and the full width of the bridge deck is 26.93m. The upper tower is 133.5M high, the middle tower is 38m high, the lower tower Z1 and Z2 are 38m and 44m respectively, the total height of Z1 tower is 209.5m, the total height of Z2 tower is 215.5m; the width of the tower column along the bridge is 7m, the width of the upper part of the second cross beam across the bridge is 4m, the width of the lower part is 4.5m, the width of the middle tower pier along the bridge is 8m, the width of the transverse bridge is 5m, and the width of the lower tower pier along the bridge is 9m The bridge is 6.5m wide, the upper crossbeam is 4m high, and other crossbeams are 4.5m high; the foundation of Z1 and Z2 main towers are provided with 24 bored piles with diameter of 2.5m, with pile length of 30m and 55m respectively, pile center spacing of 6.4m, plane dimension of (49.1 × 23.2m), pile cap thickness of 5.5m and tower base thickness of 2m. The diameter of stay cable steel wire is 7mm, and the standard value of steel wire tensile strength is 1670mpa.

 

Operation

Fare system

As of July 2016, Guozigou bridge is one of the < I (National Highway G30) < / I components of Lianyungang Horgos expressway, and its toll standard is charged according to the requirements of the expressway.

 

Traffic matters

From 8:00 to 22:00 on July 28, 2016, the inspection work of Guozigou bridge was carried out, and the intermittent traffic control was carried out. During the inspection, vehicles should pay attention to detour.

 

Construction achievements

Technical problems

Construction problems

The main construction problems and characteristics of Guozigou bridge are as follows:

1. The construction of access road is difficult and the cost is high;

2. The existing highway has poor alignment, large slope, many diseases and extremely difficult transportation conditions;

3. Guozigou bridge passes through the famous Guozigou scenic spot, which requires high environmental protection;

4. The construction site of Guozigou bridge is narrow, so it is difficult to arrange a large number of prefabrication sites and other construction sites;

5. The winter is long, the temperature is very cold, concrete construction needs to take specific measures, the quality of concrete construction in winter is difficult to guarantee.

 

technological innovation

1. According to the complex terrain, complex climate, fragile ecology, scenic spot landscape requirements, short effective construction period, narrow construction site and other construction conditions of Guozigou bridge, the steel truss cable-stayed bridge is selected as the implementation scheme of Guozigou bridge, which can better solve the problems of component transportation and beam erection in mountainous terrain, and reflects the close combination of bridge type selection and construction conditions.

2. The steel truss girder of the Guozigou bridge is better than the concrete girder in terms of structural stress, half of dead load and good seismic performance, which is suitable for the high seismic intensity at the bridge site; It has good ventilation and wind resistance, and is suitable for the complex wind environment at the bridge site. Its members are miniaturized, factory made, convenient for transportation and hoisting, free from the influence of climate, fast installation speed, low risk during construction, and easy to guarantee the construction period and quality.

3. The steel truss girder of Guozigou bridge adopts integral joint technology, which has smooth overall appearance, strong integrity, few parts and small on-site installation workload, and is well adapted to the requirements of construction period.

4. Due to the lack of meteorological data in the mountainous area, a temporary observation station is set up at the bridge site. The observation data are compared with the four nearby meteorological observation stations synchronously, and the meteorological parameters at the bridge site are deduced. The wind environment parameters of the Guozigou bridge are calculated and analyzed by using the digital terrain. The dynamic characteristics of the structure and the wind tunnel tests of the segmental model and the whole bridge model are carried out, so as to find out the anti wind characteristics of the bridge Wind performance.

5. Due to the high seismic intensity and bridge height, the seismic performance of high bridge is an important factor in the selection of bridge type. Guozigou bridge has carried out special research on a variety of bridge structures and seismic measures, and the research results are directly applied to the construction drawing design.

6. Guozigou bridge is located in Guozigou scenic area, which requires high bridge landscape, and the main tower landscape of cable-stayed bridge plays an important role. It is rare that the height above the deck of the main tower of this bridge is lower than that of the tower pier. The ladder shape is adopted in the design, and the visual segmentation is carried out in the height direction, which has achieved good landscape effect and has the originality in China.

7. Because the steel bridge deck pavement has the characteristics of complex construction technology, high use environment requirements and easy damage during operation, the precast concrete slab is used in the bridge deck system of Guozigou bridge, which can avoid many problems and improve the durability and driving comfort of the bridge deck pavement. There are many closure positions of the main truss, including 2 lower chords, 2 upper chords and 2 inclined bars, with a total of 6 closure positions, In the design, chord is used to achieve accurate closure through long round holes and round holes on the vertical plate, and inclined rod is used to achieve semi accurate closure through on-site hole casting. The closure process is original in highway industry.

 

Scientific research achievements

Honorary recognition

Cultural characteristics

"Yiwu passenger travel"

Chinese PinYin : Guo Zi Gou Da Qiao