The single hole double layer chunfeng tunnel was drilled 128 meters

Chunfeng tunnel project has been tunneling 128 meters, shield machine is under construction on the riverside avenue. Chunfeng tunnel excavation diameter of 15.8 meters. The chunfeng tunnel starts from binhe avenue in the west to the east side of the overpass, docking with binhe avenue in the east to the south side of xinxing interchange and docking with henan road, with a total length of about 5.08 km, including a tunnel length of about 4.82 km. Two - way four - lane, using a single - hole double - layer form, shield tunnel length of 3,603 meters. Chunfeng tunnel is the first municipal highway tunnel constructed by shield method in shenzhen. The tunnel is constructed by mud-water balanced shield tunneling machine with the largest diameter in China. The total length of the shield tunneling machine is 135 meters, the excavation diameter is 15.8 meters and the total weight is more than 4,800 tons.

In October this year, the shield tunneling machine officially went into the well, and the current position has been drilled 128 meters. Along the chunfeng tunnel, there are many structures under the tunnel, and it needs to pass through the buji river, luohu railway station, subway line 1 and line 9, 11 geological fault zones and other extremely high risk sources. The construction difficulty and construction risk are ranked in the forefront among similar projects at home and abroad. The shield tunneling of the current project has been tunneled to the bottom of the main road of binhe avenue. The tunnel roof is about 12 meters, less than the excavation diameter, and the shield tunneling goes through a sewage box culvert in parallel with a vertical distance of 8 meters, which makes the construction risk high. In order to ensure the construction safety, chunfeng tunnel adopts various measures to continuously strengthen the monitoring work, real-time feedback of surface and tunnel monitoring data; Pay close attention to the parameters of shield tunneling machine to ensure the safety of shield tunneling; Increase the mud weight and viscosity to increase the thickness of the mud film to stabilize the formation. The shield tail seal has been protected by oil and grease replenishment to ensure that the shield tail is not broken by external water and soil pressure, avoiding the risk of water and sand gushing in the shield tail.

In order to reduce the impact of chunfeng tunnel construction on the production and life of the surrounding residents, the project took the initiative to carry out sound insulation and noise reduction for the sludge water treatment plant, installing shock absorber, adding double-layer sound insulation board, setting up independent vibrating screen foundation, etc. Measured by the luohu administration of the municipal bureau of ecological environment, the indexes are in line with the national standards. The relevant person in charge of chunfeng tunnel project department said that during the shutdown of the shield tunneling machine, there are risks such as water gushing, sand gushing, settlement and cracking of the upper sewage box culvert, and surface subsidence endangering traffic safety, so the shield tunneling must be kept safe. Under the condition of ensuring safety, chunfeng tunnel will optimize the construction time, create a civilized construction atmosphere, through the project tunnel as soon as possible, to facilitate the transportation of shenzhen citizens.