Loading...
April 25, 2:46 a.m
G5 Beijing-Kunming Expressway Chengmian Expansion Project
In the way that the four bridges rotate together
Achieved the crossing of the Northern Ring Road Liaison Line
and Chengdu North Ring Road
(hereinafter referred to as: Chengdu North Ring Line Railway Hub)
Precise docking with the main bridge
The turnaround bridge of the G5 Beijing-Kunming Expressway Expansion Project is located in Qingbaijiang District, Chengdu, which is the throat of the northbound passage out of Chengdu City. The Chengdu North Ring Railway Hub crossed by the turnaround bridge, connecting Qingbaijiang International Logistics Port to the north and Chengdu North Railway Station, the largest freight train marshalling station in Sichuan to the south, is the traffic artery for Chengdu's north-south trains, and the average daily throughput of freight trains and passenger trains such as China-Laos trains and China-Europe trains is more than 170 trains, which is a particularly busy railway trunk line.
Considering the busyness of the Chengdu North Ring Line railway hub, in order to ensure the safety of the train, while not affecting the normal operation of the China-Laos train and the China-Europe train, it was finally decided to adopt the four-bridge simultaneous rotation method.
Synchronous rotation construction of four bridges
Two turnaround bridges on the south side cross the Chengdu North Ring Road
The length is 125 meters and 112 meters, respectively
The weight is more than 16,000 tons
Two turnaround bridges near the north side
It is necessary to cross the Northern Ring Road
The span is 160 meters and 112 meters
Among them, the weight of the 160-meter bridge reached more than 28,000 tons
The total weight of the cluster is 76,000 tons
Such a large volume of cluster turning
It has set a new weight record for cluster rotary bridges in southwest China
To minimize construction
Impact on the passage of rail freight trains
The construction site will first complete the prefabrication of the bridge on both sides of the existing railway
Then through the hydraulic jack system
The bridge body is rotated at an altitude of more than 20 meters
In order to achieve the purpose of crossing the Chengdu North Ring Road railway hub
Ensure the normal passage of passing trains
How to turn a bridge with a total weight of 76,000 tons?
According to the introduction
The construction unit is under the pier
The rotating system is embedded in advance
After the start of the turnaround works
Four sets of hydraulic jacks
Pull the strand through the computer unified control
The ball hinge in the rotating system is driven to rotate
During the turn
The construction personnel always observe the change of angle
Measure the coordinates of the rotation
And through the BIM digital twin system
Precise control of the turning process
Ensure that the parameters must be "just right"
ultimately
It lasted 66 minutes
The four bridges are rotated separately
Precise rotation at 71.8°, 71.8°, 77.9° and 77.9°
After the rotation is completed
G5 Beijing-Kunming Expressway Chengmian Expansion Project
The main part of the railway-related bridge was basically completed
It will lay a solid foundation for the completion and opening of the whole line by the end of this year