The total weight of over 9,000 tons of Hunan's largest bridge top upgrade project was launched

The bridge top promotion site is about 383 meters north at the intersection of Wanjiali Road Elevation and Fuyuan Road. Photo by Sheng Lei

Xingsha Times (Reporter Sheng Lei Correspondent Huang Chuyun) On August 3, the rapid transformation of Wanjiali Road, Changsha City, Hunan Province, which was built by the 5th Bureau of China Railway Bureau, started the construction of the Bridge of the North Extension Project, and opened to traffic to the main bridge. Another important step. It is reported that this is currently the largest bridge Dingxiao Bridge project in Hunan Province.

The bridge top lift is a new type of bridge correction technology that uses hydraulic pressure to raise the main load -bearing structure of the bridge without changing the plane position of the original bridge. This time the bridge top promotion is located at the intersection of Wanjiali Road Elevation and Fuyuan Road at about 383 meters north. In order to ensure the full connection with the new viaduct, it is necessary to top up the two existing two -crossing bridge. The total length of the top upgrade is 150 is 150 Mi, the maximum top lift height is 5.4 meters, the total weight is 9255 tons, and the top rise area is 3750 square meters.

"This time the bridge is up to the top level in the industry whether from height, weight, or technical difficulty." Shen Zhi, executive deputy manager of the rapid transformation of Wanjiali Road in China Railway Fifth Bureau. It has introduced the most advanced PLC computer synchronization control system in China, and uses 73 large -scale jack equipment ranging from 100 to 300 tons to meet the needs of the overall synchronization top -up and control construction and control.

When the top of the beam rises to the design height, all the upper structure loads are borne by the hydraulic jack and tighten the hydraulic pound mechanical full pressure ring. Then remove the follow -up jack and its support structure to provide construction space for the pier column transformation. After the top is lifted to the design height, the original lower structure bridge pier is removed, the steel bars are connected, and the concrete is poured. After the pier column reconstruction, support, and stone padding are completed, the hydraulic jack and its support structure are removed.

According to the top upgrade process, it is planned to rise by 30 to 40 cm per day, and the construction cycle of the entire top upgrade project takes about 1 month. After the bridge surface is in place, the bottom structure of the bridge will be renovated. It is expected that at the end of November this year, seamless docking between the new and old elevations will be achieved.

Xiong Ying, an on -site engineer of the North Extension Line Project of Wanjiali Road, said that the scale of the top upgrade is large and the height of the rampance is high to ensure the safety, reliable quality, and high standards of the top upgrade process. Essence

In order to ensure the smooth progress, the project department set up a special management team of Dingli construction to mobilize experienced technical managers, implement quality goals management, timely solve difficult problems in the construction process, and ensure construction safety and engineering quality. Before the construction of the top -up construction, do a good job of verification of the actual bridge deck, bridge pier, etc., the approval of the special construction plan, and the training of the safety technical interchange of the construction personnel to ensure that the on -site workers understand the safety, quality standards, the construction procedures and work content of the on -site workers at the scene Essence

At the same time, the on -site configuration of the advanced top -lifting control system can be configured to achieve the slope top upgrade function of multi -point synchronization control capabilities and the same angle speed, and according to the actual situation of the on -site, do a good job of designing and construction of the beam structure offset device. Take reasonable measures such as wedge -shaped steel pads to solve the problem of not vertical problems with the beam.

The person in charge of the county key construction project affairs center said that the center will take the "year -on -year speed -up year" as the starting point, use clear weather to seize the construction period, further strengthen the project on -site management, strictly control the safety and quality of the project, and speed up Wanjiali Road to be fast fast. The construction progress of the transformation project ensures the smooth progress of the project.

The reporter learned that after the completion of the rapid transformation of Wanjiali Road, the north extension line project can carry medium and long -distance traffic, especially the function of long -distance transit traffic, effectively alleviate the traffic congestion of the north and south of Changsha City. , A large number of vehicles on the road that needs to be transformed through nodes can quickly enter the main line to realize the seamless connection of Xiangfu Road elevated, Wanjiali Road, Xingsha connection line and the second ring line without red and green lights. The existing Wanjiali North Road traffic saturation problem, shortening the driving time of the stars and sandy areas to enter the main urban area, and accelerating the integration and development of Xingsha and Changsha urban areas.

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