Under the railway, "tiger mouth extraction"!Changsha's "57 -year -old" old railway bridge is opened for demolition

Changsha Evening News, Changsha, August 17 (All media reporter Nie Yingrong intern Su Hong) The above is the busiest Beijing -Guangzhou line in the Puchai Railway passing through Changsha. Below is the "57 -year -old" Lijiang Road Old Railway Bridge. Today, at the construction site of the Kyoto Railway Handong Tuojian Reform Project in Lijiang Road, which is located in Tianxin District, the old railway bridge was officially opened and the historical stage is about to bid farewell.

At the time of construction, there is still a train every 3 to 5 minutes through the railway. To ensure safety, its construction difficulty can be imagined. The construction party claimed that it was like "extraction from the tiger's mouth", but solved the problem one by one through multiple measures. At the end of this year, the narrow "bottleneck road" under the bridge will become a two -way 6 -lane path.

Dismantle the old bridge

Change the "fulcrum" for the railway in advance, and the train is still connected

"Oh! Oh! 1!" At 10 am on the 17th, at the intersection of Lijiang Road and the Beijing -Guangzhou Line in Tianxin District, an excavator cannon machine was working to break the concrete bridge of the old railway bridge of Lijiang Road. Personnel carried out Feng Ho's operation simultaneously.

On the side beam platform next to it, the commanders are conducting the safety and orderly operation of the excavator artillery machine, and the guardians monitor the conditions of the bridge and the steel beams in real time. "

The reporter found that every 3 to 5 minutes, a train passed by the railway on the bridge. But this bridge is removing. How to support the rails above and passing the train?

Liu Xinjun, the manager of the three companies of China Railway Twenty -Fifth Company, across the Beijing -Guangzhou Railway Handong Tuotong Reform Engineering Project, pointed at the part of the bridge body and the railway, saying that they had installed D -type steel beams in early August and built a pier. The column has completed the overhead system transfer.

"Now it is completely supported by steel beams and pier columns, and the old railway bridge will no longer work." Liu Xinjun introduced that the old railway bridge will be demolished at the end of August. Essence

Build a way

The 2 lanes under the bridge become 6 lanes, say goodbye to "bottleneck road"

According to the information provided by the designer, the old railway bridge was completed in 1965 (when it was a single -line bridge, and the complex bridge was completed), it has been 57 years. Since the bridge of Lijiang Road, only 12 meters wide and two -way lanes. With the development of the surrounding economy and society, it has become a "bottleneck road" that is often congested.

In order to solve this problem, Lijiang Road across the Beijing -Guangzhou Railway Handong Tuo Tuo project came into being. The project is also one of the matters of the Hunan Provincial Government's "I do practical things for the masses".

"It will eventually be transformed into a 39 -meter -wide 4 -Kong Handong Cave. The motor lanes have two -way 6 lanes, and are also equipped with sidewalks and non -motorized lanes." Liu Xinjun introduced that at the end of last year, one of them was built in advance for Lijiang Road in advance for Lijiang Road. Temporary pass. Other culverts are planned to be opened to traffic by the end of this year. By then, it will not only help the smoothness of Lijiang Road itself, but also help the smooth spread between the newly opened road and the Xiangjiang South Road. question.

Solve problems

The automatic spray is to cool down the rail, and the three classes are "one column, one inspection"

The upper train is running, and the bridge below is dismantling! Liu Xinjun said with emotion: "It is very difficult to keep the bridge under the existing railway route running, it is indeed like‘ extraction from the tiger's mouth ’.”

Where is it? He analyzed five major difficulties: first, high -temperature weather construction, the rails may have deformation of the rails; second, the railway bridge is in the railway round curve turning section, the line is large and high, and the safety requirements are higher; third, the Beijing -Guangzhou line train is driving The density is high, and the construction interference is large; fourth, there are many uncertain factors such as the suspension of the railway temporarily stopping the construction operation scheduling command, resulting in a large pressure on the construction period.

In order to ensure safety and complete construction tasks on schedule, they have adopted multiple measures to solve problems. For example, in order to prevent the rails from high -temperature bloating rails, they deliberately laid water pipes on the bottom of the waist of the rail rail and automatically spray to cool down the rail.

In order to ensure the safe operation of the railway, except for the guardians of the bridge demolition site, line maintenance personnel on the railway have been dynamically tested and maintained. They fell in 24 hours, and they were "one -column and one inspection" -the every time they took a bus, they quickly checked the rail buckle, screws, and rail distances. When the train passes through this section, the speed will also be reduced from 120 km/h to 45 km/h.

When an old security officer of the Changsha Electric Power Section of China Railway Guangzhou Bureau Group Co., Ltd., when a routine safety supervision and inspection of this line, watching the dismantling of the old railway bridge, I couldn't help thinking of the inspection here when I first entered the industry more than 30 years ago. Scene, "This bridge is not big, but with the memory of old railways, we are reluctant, but we are also witnessing better development."

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