Jimu News reporter Li Xiaoqin
Intern Wang You
Correspondents: Yan Jian, Song Huimin
On a bright spring day, the Jianghan Plain is full of life.
On March 26, Jimu News reporters walked into the construction site of the Wuhan-Hanchuan section of the Wutian Expressway and saw at the construction sites of multiple control projects that pile foundation drilling, steel bar binding, formwork support, concrete pouring, and prefabricated box girder erection were ...... Each process is working in an intense and orderly manner.
At the construction site that stretches for 53 kilometers, more than 2,500 builders and hundreds of large machinery go all out to grasp the construction period, ensure safety and improve quality.
Wutian Expressway construction site
At present, the substructure of the bridge project of the project has been completed by more than eighty percent, and the superstructure construction has been fully entered. Ten beam yards are synchronously made beams, and ten beam erection machines are synchronized to erect beams, and half of the beam will be completed by the end of 2024.
Project business cards
The Wuhan-Tianmen Expressway (Wutian Expressway) is an important part of the Wuhan-Chongqing Expressway.
Among them, the section from Wuhan to Hanchuan is responsible for the investment, construction and operation management of the project by Hubei Wutian Expressway Investment and Construction Co., Ltd., a subsidiary of Wuhan Urban Development Group, as the project company, which starts from the north of Yangxin Village, Yuxian Street, Caidian District, Wuhan City, and ends in Liji Village, Tianerhe Town, Hanchuan City, with a total length of about 53.15 kilometers, and adopts the standard construction of a two-way six-lane expressway with a design speed of 120 kilometers per hour.
The project has about 46,068 meters of bridges, accounting for 86.7% of the total, 7 interchanges, including 2 hub interchanges, 5 general interchanges, 1 main line toll station, 1 service area, 1 maintenance work area and 1 management sub-center. After the completion of the Wuhan-Hanchuan section of the project, it will help Tianmen enter the "one-hour economic circle" of Wuhan.
Songyang hub interconnection
The new five bridges "cross" the Hancai Expressway
Next to the Gong Yu Highway on X104 County Road, Suohe Town, Caidian District, Wuhan City, the reporter saw from the perspective of a drone that as the largest hub interchange node in the Wuhan section of Wutian Expressway, the Songyang hub interchange construction site was busy, and the traffic flow on the Hancai Expressway under the bridge was surging, which was not affected by the construction above.
Songyang hub interchange construction site
Liu Ming, deputy chief engineer of the Wuhan section of the Wutian Expressway Project, introduced that the Songyang hub is interconnected, and the main line of the Wutian Expressway crosses the Hancai Expressway, and the two expressways are connected by the newly built 8 ramps. Since the new ramp will run parallel on both sides of the Hancai Expressway, it is necessary to remove the existing two pedestrian bridges across the Hancai Expressway and build a new overpass with a longer span on the original site to leave room for the ramp. At the same time, the main line bridge and B and D ramps of Wutian Expressway also need to cross the Hancai Expressway.
Renderings of Songyang hub
"This means that we need to dismantle two high-speed prestressed diagonal leg rigid bridges and build five new steel bridges across the Hancai Expressway in the Songyang interchange area. Liu Ming introduced that in the face of the most complex key project in the Wuhan section, in order to ensure that the construction is correct, the project cooperated with all parties to open the "battle mode" of all employees.
The project adopted two-stage guide construction, half-width high-speed closed guide, and adopted the "3+2" parallel flow construction method for the five overpasses, as well as the construction technology of "transverse slotting, longitudinal segmentation, and retreat and hoisting", and finally ensured that the construction task was completed on schedule, creating the first record in Hubei Province to carry out demolition and new bridge construction at the same time without interrupting high-speed traffic.
According to reports, the ramp and pedestrian bridge across the expressway have been concretely poured, and the steel structure "skeleton" of the main line bridge has also been formed, and the next step will be to hoist the bridge deck.
At present, the Wuhan section of the project department is equipped with sufficient personnel, machinery and materials, and is comprehensively promoting the construction speed and efficiency, and the project image progress is "new day by day", and it is making every effort to sprint to the node goal of half of the main line before the "Eleventh Day" and full width of the main line at the end of the year.
Makou Hanjiang Bridge
The first pouring of the "No. 0 block" beam section of the main pier was completed
As the drone's camera turned to the construction site of the Wutian Expressway Hanjiang Bridge in Hanchuan City, from the air, workers wearing seat belts were working on the main piers on both sides of the Hanjiang River.
The construction of the Makou Hanjiang Bridge is in full swing
Makou Hanjiang Bridge is the control project of Wutian Expressway, the bridge is a double-tower single-cable surface prestressed concrete backbone beam low tower cable-stayed bridge, with a total length of 570 meters, its main span of 260 meters across the river, the span ranks third among the same type of bridges in the country.
The reporter found that the shape of the main piers on both sides of the Han River is very eye-catching, and each main pier is composed of two rectangular thin pilasters parallel to each other, and the river water can flow slowly between the two columns. Wang Zhenyu, head of the first branch of the first standard Hanchuan section of the Wutian Expressway project, said that these are rectangular thin-walled solid columns with double limbs, each column is 22 meters long, but only 2.2 meters wide.
Renderings of the Makou Hanjiang Bridge
If the ratio of length to width of the pier is too large, the stress distribution is uneven, and cracks are prone to occur. In order to overcome this difficulty, the project cooperated with well-known universities in the province to try the method of online and external pouring test section for the first time to optimize the C55 high-grade concrete mix ratio, and finally ensure the pouring quality of the main pier.
Just a week ago, the Makou Hanjiang Bridge successfully passed a "big test" - the "No. 0" beam section of the No. 3 pier on the Hanchuan side was poured for the first time, marking the official transfer of the bridge to the superstructure construction stage.
According to reports, the design length of the "No. 0 block" beam section of the superstructure of pier 3 is 15 meters, 9 meters high, 36.7 meters wide, and about 1,892 cubic meters of concrete need to be used, which is poured in two layers, and the first pouring is completed 1,002 cubic meters.
Wang Zhenyu was very excited to see the preliminary formation of the "No. 0 block" beam section, "This not only ensures the smooth completion of the important node construction period and schedule, but also provides data guidance and strong technical support for the pouring of other sections of the continuous beam." ”
According to the plan, the Makou Hanjiang Bridge will fully enter the main beam construction stage in mid-May, and sprint to have the construction conditions for hanging cable girders by the end of this year.
Cross-Shanghai-Chengdu railway crossing project
Carefully plan the construction of the escort rotary bridge
At the same time, in Gaoguan Village, Ma'an Township, Hanchuan City, the Wuhan-Chongqing Expressway Wuhan-Hanchuan Section and Shanghai-Rong Railway Crossing Project (hereinafter referred to as the "Cross-Shanghai-Chengdu Railway Turnaround Bridge Project") has also officially started, and all members of the project have entered the working state of "full string".
The cross-railway project held a technical disclosure and construction coordination meeting
It is reported that the cross project is 404 meters long, in order to reduce the impact of construction on the railway, the section of the cross-iron bridge will be constructed by means of cast-in-situ rotation of the bracket, that is, the bridge is first divided into left and right widths along the direction of the railway up and down the line respectively, and then through the rotating device to achieve the rotation, across the railway. The single-width rotating bridge is 150 meters long, 19.88 meters wide, weighs about 1.6 tons, and crosses the railway at an angle of about 88.3 degrees.
"The construction of the turntable bridge is very well established, and the challenge is that the main bridge is very close to the existing railway line. He Lin, deputy director of the engineering technology department of Wutian Expressway Project Company, told reporters that the main bridge pier protective pile is only 4.73 meters away from the Shanghai-Rong railway protective fence, and the minimum clearance from the bottom of the main bridge bridge beam to the top of the track is only 10.22 meters.
To this end, the project department will pilot the operation of the intelligent monitoring system in the project, through which the existing line will be monitored 24 hours a day for long-distance automatic monitoring, and once the warning value is reached, the alarm system can be automatically started to ensure the full monitoring of the line.
At the same time, the balance control of the synchronous rotation of the double-spoke bridge is the most critical control link. He Lin introduced that the two rotating bridges need to be rotated synchronously to achieve parallel layout, and the interval between the two bridges must be controlled at 37 cm. In other words, the operating accuracy of the turntable must be controlled within 1 cm.
In order to guide the bridge to complete the rotation safely and smoothly, the project department is carefully planning and plans to use the attitude positioning technology of the measuring robot to track the rotation in real time to effectively ensure the accuracy and safety of the rotation.
He Lin is full of confidence: "We will organize the railway-related construction units to sprint towards the goal of completing the construction of the lower part of the project within the year." ”
(Photo courtesy of the correspondent)
(Source: Jimu News)
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