General situation of Langqi Minjiang River Bridge
Langqi Minjiang River Bridge and its connection project will adopt beautiful twin towers (equal height) cable-stayed bridge. The main bridge is 1 160m long and 28.2m wide, with four lanes in both directions (6 lanes reserved).
At present, Langqi Minjiang Bridge has entered the substantive stage of preliminary preparation. Recently, the reporter took a ferry from Mawei Tingjiang to Langqi and arrived at Langqi Ferry Terminal. The reporter saw that the passage from Hong Guang Village to the riverside (the terminal of Langqi Bridge under design) is being widened.
According to relevant persons from the Management Committee of Langqi Economic Zone, the site of Langqi Minjiang Bridge is located about 800 meters upstream of Dongqi Wharf in Tingjiang. After the bridge crosses Chang 'an Avenue to the west, it meets the planned road on the east side of Shenhai Expressway, crosses Minjiang River to the east of the bridge, and then reaches Huandao Road and Tonghe Road in Langqi Island. The total investment of the bridge is 2.7 billion yuan.
Langqi Minjiang Bridge and its wiring works are divided into Langqi Minjiang Bridge, Tingjiang Interchange, Langqi Huandao Road Interchange and Tingjiang Wiring, and the China Railway Bridge Bureau is responsible for the construction. Among them, the main line is a first-class highway with a design speed of 60km/h, starting from National Highway104 (2,300km+272m), connecting with Tingjiang River in the west and connecting with Huandao Road and Tonghe Road in Langqi Island across Minjiang River in the east. Among them, Langqi Minjiang River Bridge is 2675 meters long, the main bridge is 1.280 meters long and the main bridge deck is 28.7 meters wide. According to the design of two-way four-lane and emergency parking zone, six lanes are reserved. Under the bridge, 30,000-ton seagoing ships can be navigable. The main bridge is designed as a cable-stayed bridge with twin towers and the same height, with a main span of 680m, ranking 10 among similar bridges in the world. After the completion of Langqi Minjiang River Bridge, you can directly enter Langqi from the central area of Fuzhou Economic and Technological Development Zone through the bridge. In the future, with the further improvement of the surrounding road network, the distance between the central city of Fuzhou and Langqi Island will be shortened to about 23 kilometers, and the driving time will be shortened to about 20 minutes, thus greatly shortening the distance between Langqi and the central city of Fuzhou, further highlighting Langqi's location advantage at the mouth of Minjiang River, and laying a solid foundation for Langqi's great development, great development and great leap.
The construction units of Langqi Minjiang River Bridge are: China Communications No.2 Navigation Bureau and China Railway Bridge Bureau, and the supervision unit is Xi 'an Ark Engineering Consulting Co., Ltd. ..
20: 10/1May1July 10: 10 minutes 4-10 # of Langqi Minjiang River Bridge (pier 4/pile kloc-0/0 #) 20:/.
technology standard
Design base period: 100 year.
Road grade: the main line is a first-class highway and a first-class urban trunk road, and the branch line is a first-class urban trunk road;
Design driving speed: 60 km/h;
Design load grade: Highway-I;
Bridge width: main bridge 28.7m, approach bridge 25.5m m.
Road width: 45m, 32m.
Design flood frequency:1/300;
Navigation standard of bridge: Class I channel, navigable for 30,000-ton seagoing ships;
Navigation clearance: maximum navigable water level: 6.778m (Luozero elevation), with clear height > 55.1m;
Clear width of navigation: single-hole two-way navigation, with clear width greater than 630 m;
Design wind speed: 10m height, 100 annual basic wind speed is 39.1m/s;
Earthquake: The peak horizontal acceleration of bedrock with 50-year exceeding probability 10% and 100 exceeding probability 10% and 4% is 66 and 93,138 gal respectively; They are;
Construction conditions
The climate of the project area belongs to a typical subtropical maritime monsoon climate, with alternating cold and warm seasons and distinct dry and wet seasons. The geographical location near the sea makes it cold in winter, hot in ciel phantomhive, warm in climate and average in rainfall. In terms of seasons, March-June is spring, July-September is summer, 10 ~ 1 1 is autumn, and12 ~ February is winter.
The annual average temperature in the project area is 19.3 ~ 20.0℃, the average temperature in spring is 19.5 ~ 20.2℃, the average temperature in summer is basically maintained at around 27.3 ~ 27.9℃, and the temperature changes little, and the average temperature in autumn is19.3 ~ 20./kloc. The annual average relative humidity is 75% ~ 8 1%, and the annual rainfall is1380 ~1550 mm; The annual precipitation peak occurs in March-June and July-September; The seasonal distribution of precipitation is uneven, and spring is rainy. Spring precipitation is close to half of the annual rainfall, accounting for 45% ~ 50%; There are few rainy days in summer, but the rainfall is strong, and the seasonal rainfall accounts for 3 1% ~ 36% of the annual rainfall. Autumn and winter are dry periods, especially in autumn, and the rainfall in the two seasons accounts for 7% ~ 8% and 1 1% ~ 12% of the annual rainfall respectively. There are many typhoons in this area. The first typhoon station appeared in mid-May, and the typhoon influence concentrated in July-September. The high incidence period of typhoon influence is in late August, early September and late July.
Temperature: the annual average temperature is about 19.5℃, the highest in Leng Yue is 1, the hottest month is July, the extreme maximum temperature is 38.0℃, and the extreme minimum temperature is-1.65,438+0℃.
Air pressure: the annual average air pressure is about 10 14Pa, with the highest in February and the lowest in August. The extreme maximum pressure is 1036.3 hectopascals; ; The extreme minimum air pressure is 975.5 hectopascals.
Humidity: the annual average relative humidity is 78%, the highest in June, and the lowest in 1 1 and 65438+February. The minimum relative humidity is 13%.
Wind: The annual average wind speed is about 3m/s, which is the largest in autumn and winter, followed by spring and relatively small in summer. The average maximum wind speed in ten minutes is 26 m/s, and the wind direction is northeast wind. The dominant wind axis is obvious, SSW in summer and NE in other seasons.
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