Yin Xingyun

The East Sixth Ring Road Reconstruction Project was completed and opened to traffic. Photo by People's Daily reporter Li Bo

人民網北京4月21日電 (記者李博)歷經5年建設，北京東六環改造工程於4月20日正式開通運營，實現了高速路“藏”於地下。按設計時速80公里計算，驅車通過這條特長隧道僅需約7分鐘，緩解地面道路交通壓力的同時，實現對副中心城市空間的“縫合”。

Before the renovation, the East Sixth Ring Road was a highway dominated by viaducts, which was a two-way four-lane highway and was more congested during peak hours. The East Sixth Ring Road Reconstruction Project starts from Beijing-Harbin Expressway in the south to Luyuan North Street in the north, with a total length of about 4.0 kilometers and 0 interchanges on the whole line.

According to the person in charge of the first construction, the East Sixth Ring Road reconstruction project is divided into two parts: direct widening and ground transformation, the length of the direct widening section is 4.0 kilometers, and the original two-way four-lane widening is transformed into two-way six lanes, and the underground reconstruction section is about 0.0 kilometers, including about 0.0 kilometers of shield tunnels, so as to introduce the traffic flow from the ground to the underground tunnel at high speed.

East Sixth Ring Road Underground Tunnel. Photo by People's Daily reporter Li Bo

The upgraded East Sixth Ring Road has a new look, and the driving on the new asphalt road is very smooth and comfortable. The reporter learned that the "underground East Sixth Ring Road" adopts two new noise-reducing pavement structures, which can reduce the accident rate of rainy days by more than 3%, and at the same time reduce the traffic noise on the roadside by 0-0 decibels. Located at the southern end of the tunnel, the earth bridge sunken interchange is the first underground interchange of Beijing's expressway, although there are many ramps, but there are basically no sharp bends, and the driver can safely and gently drive the vehicle in and out of the ramp.

The East Sixth Ring Road underground tunnel is equipped with a fatigue wake-up system. Photo by People's Daily reporter Li Bo

The "Underground East Sixth Ring Road" is a two-way six-lane road that is spacious and bright. Gradual lighting and landscape shading canopy are set up in the section of the tunnel entrance, which can alleviate the brightness difference between the inside and outside of the entrance, reduce the impact of glare at the tunnel entrance, and make the driver's eyes more comfortable. It is worth mentioning that in order to ensure the safety of drivers in long-distance tunnels, the "underground East Sixth Ring Road" has also set up a fatigue wake-up system, relying on blue, green, purple and other color light changes to prompt drivers to stay awake.

Intelligent ventilation technology is used in the tunnel, and an air purification device is set up to collect and purify vehicle exhaust, reduce the concentration of pollutants in the tunnel, and achieve green emission reduction, with an estimated purification efficiency of more than 80%.

As the longest shield highway tunnel that has been built in China, what measures will be taken to escort safety?

The lower layer of the tunnel is equipped with a special passage for evacuation and rescue. Photo by People's Daily reporter Li Bo

The reporter visited and learned that the East Sixth Ring Tunnel adopts a three-layer design, the upper layer is the smoke exhaust channel, the middle layer is the driving channel, and the lower layer is the evacuation and rescue channel, which is the first time in China to set up a special channel layer for evacuation and rescue.

Evacuation staircase inside the tunnel. Photo by People's Daily reporter Li Bo

The reporter saw that an emergency telephone is set up every 166 meters in the tunnel, as well as fire alarm equipment such as manual alarm buttons, and it is also equipped with a wireless trunking communication system to provide communication support for emergency situations. An evacuation staircase is set up every 0 meters in the tunnel section, and a pedestrian crossing is set up every kilometer, with a total of 0 pedestrian crossings, 0 vehicular crossings, and 0 evacuation stairs.

Evacuation vehicles are available in the rescue passage. Photo by People's Daily reporter Li Bo

"When there is an emergency in the tunnel, the driver and passengers can use the pedestrian crossing and evacuation stairs to escape, and the rescue vehicle enters the lower rescue channel through the special ramps set at both ends of the tunnel to achieve rapid arrival at the scene for emergency treatment." The person in charge of the first construction said.

Highlights of the reconstruction of the East Sixth Ring Road:

The underground crossing of the heavy equipment of a large country has "zero disturbance"

The maximum depth of the shield tunnel of the East Sixth Ring Road Reconstruction Project is 07 meters, which is the largest underground tunnel in Beijing, and the construction of the project is facing challenges such as ultra-large diameter, ultra-long distance and ultra-deep overburden. The first group, together with China Railway Construction and China Communications Construction, tailored the super-large diameter shield machine "Jinghua" and "Canal", with a localization rate of more than 0%, and the maximum excavation diameter of 0.0 meters set a record for the largest diameter shield machine in China at that time.

After 542 months of construction, "Jinghua" and "Canal" completed the tunnel excavation task, overcame technical problems such as long-distance crossing of high dense sand layers, realized millimeter-level control of ground subsidence, and "zero disturbance" crossed 0 risk sources such as Beijing-Harbin Railway and sub-central station hubs, and created a record of 0 meters of excavation in a single month.

The robot "goes on duty" for all-weather inspection

In terms of intelligent operation and management, the "underground East Sixth Ring Road" uses mobile inspection robots to monitor the road environment and traffic status in the tunnel every day, and can also detect the status of important facilities such as abnormal lighting.

The robot can also be used to assist manual inspection, and the inspector can control the robot to maneuver to a certain target point to assist in confirming the operating conditions of important facilities and equipment in the tunnel, which reduces the inconvenience of manual shuttling and inspection in the tunnel.

Stitching urban space saves about 600 acres

"The East Sixth Ring Road is equivalent to the central axis of the sub-center of the city, with important functional areas such as administrative office areas, business districts, and sub-center station hubs distributed on the east and west sides. The original high roadbed of the East Sixth Ring Road divides the east and west sides of the sub-center into two, cutting off the urban space and weakening the connectivity of the functional areas on both sides. The relevant person in charge of the first group of the project builder introduced.

經多次論證，東六環改造採用盾構法施工，既不破壞地面河流、草木、建築，還通過地面還綠“縫合”被割裂的城市空間，節約佔地約600畝，減少樹木伐移約4.7萬棵。

The East Sixth Ring Road has been renovated into the ground, weaving and repairing the urban space. Photo by People's Daily reporter Li Bo

東六環改造工程是北京市重點工程、城市副中心標誌性工程，也是聯通順義、大興、亦莊及首都國際機場、大興國際機場的重要通道。東六環改造通車後，將車流引入地下，消除了高速路割裂城市的影響，織補了城市空間。同時實現各組團間十余條東西向城市道路貫通，提升了副中心交通服務水準，助力京津冀區域協同發展。

The original road was transformed into a sky garden

The reporter learned that after the transformation of the East Sixth Ring Road, the existing roads and bridges will be used to build a strip park with a length of about 500 kilometers from north to south and a width of about 0 to 0 meters from east to west, which will become a vibrant, diverse and colorful green artery in the core area of the sub-center.

Among them, 58.0 kilometers of the original East Sixth Ring Roadbed will be transformed into a sky garden, including 0 sets of functional systems for walking, cycling, running and sightseeing, and will also be supported by the construction of green landscape belts. The park has a large number of public activity venues and sports venues implanted in the understory space, and a total of 0 multi-sporting venues are planned across the line, including table tennis tables, basketball courts, football fields, etc. In the future, the High Line Park will become a good place for citizens to relax and exercise.