Langqi Minjiang Bridge

Langqi Minjiang Bridge

Langqi Minjiang River Bridge is a river crossing channel in Fuzhou City, Fujian Province, China. It is located at the estuary of Minjiang River and is one of the important channels connecting Mawei District and langdao

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The construction of Langqi Minjiang Bridge started on September 24, 2010

On November 1, 2013, the bridge and connection were completed, and the whole bridge was connected

It was put into operation on January 1, 2014

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Langqi Minjiang Bridge starts from national highway 104 in the west, crosses Minjiang Estuary in the East and ends at Huandao Road Interchange in the East. The length of the line is 8.437 km, and the length of the bridge is 1280 M. the bridge deck is a two-way six lane urban trunk road with a design speed of 60 km / h. The total investment of the project is 2.256 billion yuan

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Construction process

On December 31, 2009, Fuzhou economic work conference was held, and 322 municipal key projects were preliminarily arranged, including the construction project of Langqi Minjiang River Bridge.

On February 22, 2010, Langqi Minjiang Bridge was approved by Fujian development and Reform Commission

On April 13, Fujian Provincial Development and Reform Commission approved the proposal for the construction of Langqi Minjiang Bridge and its connection project; on May 11, Langqi Minjiang Bridge carried out pier exploration; on September 16, Langqi Minjiang Bridge carried out pile test and held relevant ceremonies; on September 24, construction of Langqi Minjiang Bridge started and the commencement ceremony was held

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On April 9, 2011, Langqi Minjiang Bridge carried out the construction of the last steel protecting bucket for Pier 4 of the main bridge

On April 19, the drilling of No.4 main tower pier of Langqi Minjiang Bridge was carried out; on May 11, the drilling of No.10 hole of Langqi Minjiang Bridge was completed; on December 22, the pouring of No.3 pier bearing platform of Langqi Minjiang Bridge was completed.

On February 15, 2012, the concrete pouring of the first section of the upstream tower column of No. 4 main tower pier in bid section II of Langqi Minjiang Bridge was completed

On May 21, the lower beam of main tower of Langqi Minjiang Bridge was poured; on August 10, the beam of No.0 section of Langqi Minjiang Bridge was poured; on September 27, the middle beam of No.4 main tower pier of Langqi Minjiang Bridge was poured; on November 25, the erection of the first section of steel box girder of Langqi Minjiang Bridge was completed

On December 13, the concrete pouring of auxiliary bearing platform of No. 6 main bridge of Langqi Minjiang Bridge was completed

On December 18, the main pylon pier of Langqi Minjiang Bridge was capped; on December 25, the main pylon pier of Langqi Minjiang Bridge was capped

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On June 19, 2013, the steel box girder closure project of the main bridge of Langqi Minjiang Bridge was completed

On October 31, Langqi Minjiang Bridge completed the bridge and connection, and the whole bridge was connected

On December 29, the expansion joint pavement of the bridge deck on the side of Langqi was completed.

On January 1, 2014, Langqi Minjiang Bridge was opened to traffic and a ceremony was held

On December 28, Langqi Minjiang Bridge passed the acceptance

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Bridge location

Langqi Minjiang Bridge is located in Mawei District, Fuzhou City, Fujian Province, China. The bridge is about 15 km away from Qingzhou bridge in the southwest of the upstream and 8 km away from changmen bridge in the northeast of the downstream. The line starts from national highway 104 in the west, crosses the Minjiang River Estuary in the East and ends at Huandao Road Interchange in Langqi island in the East

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Architectural design

building structure

Overall layout

Langqi Minjiang Bridge is composed of main bridge, pylon, stay cable, pier, approach bridge and interchange ramp, and the main bridge is arranged from northwest to Southeast

 

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Design concept

Langqi Minjiang Bridge adopts diamond shaped cable-stayed pylon scheme, and the beam and top of the pylon adopt circular arc transition, which enhances the landscape effect and integrates with the local "Fu" culture, highlighting the color of Fuzhou City

 

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Design features

Design parameters

Langqi Minjiang River Bridge is 8.437 km long and 1280 m long, with a span of (60 + 90 + 150 + 680 + 150 + 90 + 60) m, including 680 m main span, 28.7 m deck width and 0.44 side span ratio,. It is 223.0m high above the top of the bridge tower bearing platform. The beam at the bridge center line is 3.5m high, the full width of the bridge deck is 30.12m, the steel box girder is 2 to the outer web, 24mm thick, and the transverse spacing is 27.4m; the inner web is 5.98M away from both sides of the bridge center line, 12mm thick; the top plate is 16mm thick, and the bottom plate is 12mm thick; the U-shaped rib of the top plate is 280mm high, and the plate is 8mm thick, and the spacing is 600mm; the U-shaped rib of the bottom plate is 210mm high, and the plate is 6mm thick, and the spacing is 720mm; the width of the steel box girder is Diaphragms are 12mm thick with standard spacing of 3.0m. The height of the tower is 220.0 meters above the top of the tower base and 162.435 meters above the bridge deck. The outer outline dimension of the tower column is 7.2 to 12.0 meters wide along the bridge and 4.8 to 9.0 meters wide across the bridge; the standard section height of the lower cross beam is 7.0 meters wide and 12.0 meters wide; the middle cross beam is 5.0 meters high and 8.2 meters wide. The height of the middle beam of the upper beam is 5.0 meters; the arc diameter of the tower top is 12 meters, and the length of the lower beam is 40.884 meters. The transverse distance between the two cable planes on the bridge deck is 27.6 meters, and 21 pairs of stay cables are arranged on each cable plane. The distance between the upper cables on the main beam is 15 meters and 9 meters, and the distance between the upper cables on the bridge tower is 2 meters; the diameter of the steel wire of the stay cables is 7 mm, and the standard strength is 1670 MPa

 

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Equipment and facilities

Anti collision facilities

As of January 2014, new composite anti-collision facilities have been adopted for the Langqi Minjiang Bridge, which can effectively reduce ship collision accidents

 

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Operation

Ticket price

On January 1, 2014, Langqi Minjiang River Bridge was put into operation, and no toll system was implemented

 

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Traffic matters

During the typhoon period, when the average wind force along the coast or on the land is more than 10, and the gust is more than 12 and may continue, the bridge will be closed and vehicles will be prohibited

 

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Construction achievements

The construction features and technologies of the Langqi Minjiang River Bridge are as follows:

1. The pier pile of No.4 bridge tower of the bridge is about 100 meters long, and the rock surface fluctuates greatly. The rotary drilling rig is used in the construction, and the steel casing is inserted into the clay layer. After the pile foundation construction is completed, the steel casing extending into the bearing platform is cut into serrated plate shape, and connected with the bearing platform as a whole, which is conducive to the structural stress.

2. The bridge is located at the entrance of the sea, with high wind speed. The unfavorable factors of the construction of the tower column and the erection of the main beam need to reasonably arrange the construction period and effectively avoid the typhoon period.

3. The surface of the bridge is mostly covered by Quaternary alluvial marine silt, muddy soil and cohesive soil, so the support construction has a large amount of work and high risk.

4. The bridge deck girder erecting crane is used to install each section of steel box girder symmetrically, and the stay cables are symmetrically hung and tensioned until the main girder is closed. The side span box girder of Tingjiang River is located on the shore, and the side span steel box girder landing wharf is set up, and the running slideway or beam transporting access road is set up to drag or transport each section of steel box girder in place, so that each section has the bridge deck girder erecting conditions. The middle span and Langqi side steel box girder are all located in the water The girder section is transported to the lifting position by the girder carrier, and the installation method of the main girder ensures the safety of girder erection and reduces the amount of steel used in construction

 

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Value significance

The opening of the Langqi Minjiang Bridge shortens the distance from Fuzhou Langqi to the central area of Mawei to about 15 minutes, and the distance to the main urban area of Fuzhou to about 40 minutes. It indicates that Langqi, the largest island of Fuzhou, is rushing to the embrace of the main city of Fuzhou, and the urban territory of Fuzhou has really entered the river and sea

 

. < I (China news online review) < / I

After the completion of Langqi Minjiang River Bridge, for Langqi Island, it will not only realize the wishes of Langqi people for many years, but also directly enter Langqi island from the central area of Mawei in Fuzhou. With the further improvement of the surrounding road network, the distance between the central urban area of Fuzhou and Langqi island can be shortened to about 23 km. At that time, the driving distance between the central urban area of Fuzhou and Langqi island can be shortened to 20 minutes. Langqi will usher in a new opportunity for development, which indicates a beautiful and unlimited future of Langqi island

 

. < I (comment on the Fifth Engineering Co., Ltd. of China Railway Bridge Bureau Group) < / I < I < / I

Address: Langqi Town, Changle City, Fuzhou City

Longitude: 119.5430558

Latitude: 26.0946899

Ticket information: no ticket required.

Chinese PinYin : Lang Qi Min Jiang Da Qiao