Build a "underwater fence", fill 739 caves, and there are methods for green construction in the east lake section of the two lake tunnels

Skin care pays attention to the establishment of skin barriers and water construction. It can also establish a "green barrier" for water bodies. On the 16th, the reporter saw in the construction area of ​​the East Lake Section of the Ligong Tunnel. A green enclosure was pulled out on the calm East Lake Lake. "It is a green construction" artifact "for the construction unit to protect the ecological environment of the East Lake.

Fill in 739 caves and open a "good road" for the shield

At that end, the two shield machines of the "Donghu" and "Gongxun" have been in the well and are ready to go. On this side, the two lake tunnel projects have completed the temporary use of Donghu water body procedures to start the construction of the cave in the lake bottom.

According to the construction staff, the "underwater wall" can protect the East Lake water body during construction. Reporter Wang Huichun Photo

What is the impact of the shield machine to dig at 50 meters underwater? Guo Haihua, the technical leader of the 2nd Lake Tunnel (East Lake Section) of the construction unit of the construction unit, told reporters that during the special survey of last year last year, the construction party had more than 500 survey holes and found 739 caves. As a result, a tree from a tree from a tree to Wuda Lingbo is a rock -soluble development area. It is about 1 kilometer long. The cave seeing the cave is 76.3%.

He explained that "Shield machine 'is afraid of softness or hardness'. There are free in the cave and full of silt. When the knife is encountered in the cave, it is not a balanced force. It is not conducive to posture control adjustment. The safety of the construction machine. "According to reports, the largest cave proven by the construction party is about 21.6 meters high, which is higher than the" Donghu "shield knife plate with a diameter of 15.094 meters." If it falls, it is dangerous. "

At present, the three shield machines of the Donghu section of the two lake tunnels in Wuhan have been assembled to complete the two units. The whole machine is debugging. It is planned to have the starting conditions at the end of June. The person in charge of the project site stated that the lake -bottomed cave grouting construction started in the construction area of ​​the Village Village will open a "good road" for the dug of the shield machine.

1 kilometer rock -dissolved area, "underwater wall" wrapped up

It is understood that after half a year, the project department has selected a variety of construction plans to compare it from the aspects of feasibility, environmental protection, construction quality, safety risks, and construction periods. After many experts demonstrated, "Steel The best solution for grouting reinforcement outside the trestle+steel platform. In the process, "environmental protection" is the first option, and all construction plans are carried out around this starting point. The first step in construction is to block the construction area, that is, 1 km of rock -soluble development zone.

The reporter saw at the scene that the steel pipe piles had been hit in the distance of the East Lake Lake. On the two construction vessels, the workers were busy with a green enclosure. "The workers are heavyweight to the enclosure, put on a stone cage, and then lay the steel pipe piles to build a 'underwater wall' for our subsequent grouting construction." Double -sided plastic PVC cloth with a width of about 5 meters, the top is a buoyant, and the bottom is perforated.

The construction staff is installing the waters. (Correspondent Zhou Xu's picture)

Gu Haihua introduced that the water depth of the East Lake is about three to four meters, and the bottom of the enclosure is paired with a stone cage, which can sink to the bottom of the lake. The lake buoy is floating with the water level, which is equivalent to pulling out a physical separation green barrier between the construction area and the East Lake water body. Construction, "it can ensure that the water body and Donghu water body maintain a relatively low exchange state, and also reduce the visual impact of construction on the landscape of the East Lake."

There are "wetlands" on the lake under the water, and there are 19 "supervisors"

The person in charge of the project was introduced that in order to ensure that green construction is adopted, the "underwater fence" is only one of them. In the next step, the project department will arrange a "wetland" of 2.5 kilometers along the construction area. The upper floor of these "wetlands" is floating wetlands, planting beautiful banana, puppets and other plants, which can effectively absorb pollutants. The lower layer is an artificial biofilm that can effectively effectively effectively. Attach microorganisms have functions such as pollutant purification, ecosystem recovery, and improvement of landscape improvement.

The construction staff is installing the waters. (Correspondent Zhou Xu's picture)

During the construction process, the impact on the water quality of the East Lake was monitored throughout the process. "We will set up 19 monitoring points in the construction area and peripheral water bodies. 10 water quality indicators and aquatic water such as temperature, pH, dissolved oxygen, transparency, total suspended particulate matter, etc. Biological conditions are monitored. "According to reports, drone cruise monitoring and shore base spectrum camera monitoring will also be used at the scene to monitor the rich educated parameters of the water body. Due to the large amount of rock -soluble treatment, the project is expected to be completed in March next year. After the rock -soluble treatment is completed, the project will remove the construction facilities as soon as possible to remove the section, eliminate the construction of the construction, and restore the original appearance of the lake.

The two lake tunnel projects are the largest large diameter tunnels in the world's largest urban lake under the lake. The design vehicle speed is 50 km/h. The project starts from Qinyuan Road and East Lake Road in the north. After the project is completed, a north -south fast channel will be formed in the Wuchang area, which can effectively alleviate the traffic pressure of roads such as the second ring line, the Lishi South Road, and the Guohu Lake Tunnel, and continuously improve the regional road network system to facilitate the travel of residents in the surrounding areas.

(Yangjiang Daily reporter Wang Huichun correspondent Lei Yu Zhou Xu)

【Edit: Zheng Xiaoxiao】

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