Jiashao Bridge

Jiashao Bridge

Jiashao bridge is a river crossing channel connecting Haining City of Jiaxing City and Shangyu District of Shaoxing City in Zhejiang Province of China. It is located in the sea area of Hangzhou Bay in Zhejiang Province of China. It is a part of Changtai Expressway < I (National Expressway g1522) < / I.

The construction of Jiashao bridge was started on December 14, 2008. The whole bridge was closed on February 3, 2013 and opened to traffic at 0:00 on July 19, 2013.

Jiashao bridge starts from Guzhu hub in the south, crosses Hangzhou Bay and reaches Nanhu hub in the north, with a total length of 10.137 km; the bridge deck is a two-way eight Lane Expressway with a design speed of 100 km / h; the project investment is 6.28 billion yuan.

Construction process

In 1993, Shaoxing put forward the construction of Jiaxing Shaoxing river crossing project and started the preliminary work.

In June 2000, the 37th executive meeting of Zhejiang provincial government made a decision on the construction of Jiaxing Shaoxing river crossing channel project.

In November 2005, the national development and Reform Commission of the people's Republic of China approved the project proposal for the construction of Jiaxing Shaoxing river crossing project.

In December 2007, the national development and Reform Commission of the people's Republic of China approved the feasibility study report on the construction of Jiaxing Shaoxing river crossing project.

In October 2008, the former Ministry of communications of the people's Republic of China approved the preliminary design of the river crossing project from Jiaxing to Shaoxing. On December 14 of the same year, the commencement ceremony of Jiashao bridge and North South connection project was held on the South Bank of the bridge site.

On July 30, 2009, the trestle project of Jiashao bridge was completed.

On February 17, 2010, the bored pile construction of the main channel bridge of Jiashao bridge was completed; on October 20, the approach bridge in the south land area was closed; on December 28, the approach bridge in the north land area was closed.

On February 23, 2012, the construction of six main towers of Jiashao bridge was completed; on August 1, the approach bridge in the water area on the south bank was closed; on December 3, the approach bridge in the water area on the north bank was closed.

On February 3, 2013, the last two steel box girders were hoisted and the Jiashao bridge was completed; on July 6, the Jiaxing Shaoxing river crossing highway project passed the acceptance; on July 18, the opening ceremony of Jiashao bridge and North South connection was held; on July 19, the Jiashao bridge was officially opened to traffic.

On July 24, 2019, Jiashao bridge passed the completion acceptance of the Ministry of transport of the people's Republic of China.

Bridge location

Jiashao bridge is located in the sea area of Hangzhou Bay, Zhejiang Province, China. It starts from Guzhu hub in the south, connects Changtai Expressway (shangsan Expressway) and Hangyong expressway, and ends at Nanhu hub in the north, connecting Zhajiasu expressway,

It is a part of Changshu Taizhou Expressway < I (National Expressway g1522) < / I.

Architectural design

building structure

The main channel bridge of Jiashao bridge adopts the scheme of 6-tower single column cable-stayed bridge with the highest technical content, which makes the length of the main bridge reach 2680m, with 5 main navigation holes. The number of cable towers and the length and scale of the main bridge rank first in the world. The bridge adopts the standard of two-way eight Lane expressway, and the total width of the main bridge reaches 55.6m (including cable laying area). Large diameter bored piles are widely used in approach bridges in water area, and the pile caps on piers are cancelled.

The main channel bridge of Jiashao bridge adopts a single column four cable plane six tower cable-stayed steel box girder bridge structure, with expansion joints set in the middle of the main bridge span, and the main beam at the expansion joints adopts a rigid hinge structure; the north auxiliary channel bridge adopts a variable cross-section continuous rigid frame bridge; the approach bridges in the South and north middle water areas adopt a span equal cross-section prestressed concrete continuous rigid frame bridge, the substructure adopts a single pile and single column form, and the foundation adopts large-diameter bored grouting The approach bridge in the South and north land area adopts the span equal section prestressed concrete continuous box girder.

Design parameters

Jiashao bridge has a total length of 10.137 km. The main channel bridge adopts (70 + 200 + 5 × 428 + 200 + 70) m cable-stayed steel box girder bridge; the north auxiliary channel bridge adopts (70 + 2 × 120 + 70) m span layout.

The main technical standards of Jiashao bridge are as follows: 1) highway grade: two-way eight Lane expressway, bridge width of 40.5 meters (excluding cable laying area); 2) design speed: 100 km / h; 3) maximum longitudinal slope: ≤ 4%; 4) deck cross slope: 2%; 5) vehicle load grade: Highway - grade I; 6) design reference period: 100 years; 7) it can resist earthquake of grade VI.

The main quantities of Jiashao bridge are as follows: 975498 cubic meters of concrete, 114308 tons of steel, 130902 tons of steel, 16893.1 tons of steel strand, 3698.5 tons of parallel steel wire, 546292 square meters of concrete coating, 693538 square meters of steel structure coating, 101665 square meters of steel deck pavement, 282101 square meters of concrete deck pavement, 52 expansion joints, 4 sets of inspection vehicles and 26 sets of dehumidification system.

The main structural quantities of Jiashao bridge are: 150 bored piles with a diameter of 3.8m, 228 bored piles with a diameter of 2.5m, 322 bored piles with a diameter of 2.0m, 92 pile caps of approach bridges in land area, 10 pile caps of main channel bridges, 18 pile caps of north auxiliary channel bridges, 150 single column piers of approach bridges in water area, 88 double column piers of approach bridges in land area, and 287 precast prestressed concrete box girders of approach bridges in water area of north bank There are 8 sections, 300 sections of 70m cantilever Cast-in-place Box Girders for approach bridge in south bank water area, 496 sections of Cast-in-place Box Girders for north auxiliary channel bridge and embankment crossing, 40 sections of Cast-in-place Box Girders for support in land area, 6 main towers, 60 steel anchor boxes for main tower, 374 sections of steel box girders for main bridge, 576 stay cables and 40548m steel guardrails.

Equipment and facilities

Safety facilities

The cable tower, steel box girder, concrete box girder column, bridge deck and other specific positions of Jiashao bridge are targeted with corresponding professional mechanical and electrical equipment, so as to strengthen the monitoring, monitoring and control of these important structural parts, timely find out potential safety hazards, prevent man-made damage, realize all-round effective control of the bridge, and ensure the safety of the bridge itself and driving safety.

 

Lighting monitoring management system

Jiashao bridge lighting monitoring and management system consists of street lighting equipment, single lamp controller, centralized controller, onenet cloud platform of Internet of things, remote data control center, mobile terminal software, etc. Firstly, the project shows the momentum of six towers and X brackets through high-power LED lighting (620W, 220W, 76W) and 400W high-power metal halide lamps; secondly, it shows the effect of the external cable-stayed lock through 620W residual light; thirdly, it outlines the outline of the bridge through LED line lights and LED point lights; and it reflects the modernization of the bridge by controlling the color change of LED lighting. At the same time, the system can set various scene modes through onenet IOT cloud platform, such as normal mode control scheme ("ink misty rain"), holiday mode control scheme ("sword string combination"), major holiday mode control scheme ("sword of the sky" and "fairy light cloud shadow").

 

Operation

Traffic matters

According to zzbh (2013) No. 56 document, the toll for small cars passing through Jiashao river crossing channel is 65 yuan, of which Jiashao bridge toll is 40 yuan, and freight cars are charged according to the model and actual tonnage. For the section from the North interchange of Binhai New City in Shaoxing to Jianshan interchange in Haining, traffic control on dangerous chemicals vehicles is still prohibited.

 

traffic flow

As of July 16, 2014, the total two-way flow of Jiashao bridge has reached 6324186 vehicles, with an average of 17422 vehicles per day. The average number of vehicles passing by is more than 700 vehicles per hour, and the toll income is 330 million yuan.

 

As of July 24, 2019, in the six years of trial operation, the traffic volume of Jiashao bridge has maintained a high growth rate of more than 20% annually, with a total of 73 million vehicles passing, and the proportion of trucks is more than 40%. In the first half of 2019, the average daily traffic volume of Jiashao bridge is 44100 vehicles.

 

Construction achievements

Technical problems

In order to prevent the influence of the swing of the main channel on navigation, Jiashao bridge creatively set up five main navigation holes to adapt to the frequent swing of the river bed. For the first time, the 3.8m large-diameter single pile and single column pier design was adopted for the approach bridge in the water area, with a total of 150 piers, and the water resistance rate of the bridge was reduced to less than 5%, so as to ensure that the spring tide of Qiantang River was not affected. In addition, the rigid hinge installation was creatively adopted for the bridge This device is the first in the world to solve the expansion and contraction problem of the main girder of a similar super long continuous bridge. Jiashao bridge is the first cable tower "X" bracket in China. As an important part of the main tower "sword", the bracket has complex structure and has no precedent at home and abroad.

 

1. Jiashao bridge is a world-class bridge built for the first time at the estuary of Qiantang River, one of the three strong tidal bore estuaries in the world (Qiantang River in China, Amazon River in Brazil, Ganges River in India). two

Chinese PinYin : Jia Shao Da Qiao