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Chuanguan News reporter Wang Meiling
Piling in the river, the surrounding river water is clear without sewage leakage, the green trees that have made holes in the mountains and cave entrances are still lush... From October 25 to 26, Shudao Group held a 2021 construction project ecological environmental protection work meeting, and spent a day to visit the construction line of the Luding-Asbestos Expressway (referred to as Lushi Expressway), and Chuanguan News reporters saw these "rare" scenes at the scene.
Zero discharge, wading construction does not pollute the river water
The Lushi Expressway Deturt Bridge, located on the Dadu River, has several piers to be built in the river, and the construction process is to first drive piles and then pour the piers. The pile foundation is deep into the bottom of the river, the construction is rushing pile construction, the construction trestle bridge, the machine roars, the river water under the bridge is clear, and no sewage is leaked.
"This sediment separator has made the construction 'zero emissions'." Chen Fujun, the project manager, pointed to a working machine and said that the sand and gravel containing water slowly climbed to the mouth of the cave and fell into the steel box by relying on the frequency of the machine. Originally, during construction, the mud formed by the water flow washing the pile foundation was pumped into the sediment separator, the sand and gravel with large particles were initially screened out, and the remaining mud entered the sedimentation tank located on the shore through the laid pipe, and filtered again through the filter press and other equipment; the filter press filtered out clear water and solid particles, and the solid particles were pressed into mud cakes.
Lushi Expressway Deturt Bridge pile foundation construction site
All the separated dirt has a place to go – gravel and fine sand are recycled into the yard as raw materials for concrete; the filtered water can be used as water for tanker cleaning, site washing and mixing station flushing; mud cake is used as subgrade filler or green soil.
Sedimentation tanks located on the shore not only treat the sewage collected by the piling construction. Yan Hongguang, director of the Luding Representative Office of Lushi Company, introduced that all production and domestic sewage in the production line are connected to the sedimentation tank through pipelines, separating mud cakes and clean water, and recycling.
Zero discharge of sewage and all solid waste are reused. At present, the entire line of Lushi high-speed construction has achieved "zero discharge" of production and domestic sewage.
"Zero excavation", tunneling focuses on ecological protection
It is common for highway construction to open roads in the face of mountains, build bridges in the face of water, and build tunnels. At the entrance of the Liyue Tunnel, the Chuanguan News reporter saw that the opening of the Liyue Tunnel has a circular curved bracket that protrudes out, and the construction is excavated from this bracket, and the area around the cave entrance is lush trees, a greenery.
"We have 'zero excavation' for all tunnels." Peng Zhizhong, director of safety and environmental protection of Lushi Company, said. The traditional tunnel opening excavation, just like cutting tofu, first carries out a large-scale slope cutting and reinforcement of the mountain, and then excavates and constructs on a relatively flat section; while "zero excavation" is to extend the tunnel first and spray concrete slope protection, which not only maximizes the protection of the trees and vegetation around the cave entrance, but also avoids safety risks such as slope collapse increased by large-scale excavation.
Pointing to the opening of the Liyue Tunnel behind him, Peng Zhizhong introduced that the construction bracket of the extended tunnel is about 10 meters high, while the traditional tunnel, the height of the opening is at least about 20 meters. "These trees at the mouth of the cave will be dug up." Peng Zhizhong said.
Lushi Expressway Liyue Tunnel Entrance
According to reports, Lushi Expressway is the first full-line tunnel construction in the province to implement the concept of 'zero excavation' highway, the whole line of 18 tunnels and 72 holes on all lines are using the "zero excavation" construction of the hole, the reduction of the hole wound damage is about 43,000 square meters, equivalent to 8 standard football fields.
Innovate and explore the standard of environmental water protection for the construction of mountain highways
In addition to the visible "zero emissions" and "zero excavation", there are also many innovations in many "invisible" places. Sun Lai, executive deputy manager of the C2 General Contracting Department of Lushi Expressway, introduced that as a construction unit, they use a large number of intelligent machinery instead of labor. For example, the integrated sewage treatment equipment in the tunnel, the on-board mud treatment equipment of the bridge project, etc.; excavators, loaders, slag trucks, etc., gradually replace the traditional diesel equipment with electric equipment to reduce air pollution; in the centralized sewage treatment area of the construction site, a 360-degree 24-hour monitoring camera is installed, and an APP is developed to monitor the front line in a timely manner through mobile phones. "Some construction sites are piloting infrared probe monitoring, and once man-made pollution is found, it can be warned in time." Sun Lai said.
The 96.5-kilometer Lushi Expressway connects Yakang and Yaxi two major traffic arteries in western Sichuan, which is close to the Gongga Mountain Scenic Area, and connects tourist scenic spots such as Hailuogou, TianwanHe and Anshunchang along the route, facing the tests of complex engineering geological conditions, high proportion of bridges and tunnels, difficult construction, and fragile ecological environment. "Minimal destruction is maximum protection." Yuan Feiyun, deputy general manager of Shudao Group Zanggao Company and chairman of Lushi Company, introduced that lushi high-speed construction adheres to "protection first, prevention first, comprehensive treatment", compiles and completes the "Standardized Atlas of Environmental Protection and Soil and Water Conservation of Complex and Difficult Mountain Expressway Construction Projects" (version 1.0), explores and establishes a new set of environmental protection and soil and water conservation management mode for the whole process of expressways, and strives to create an "ecological road".
Lushi high-speed renderings
"This on-site meeting is to set up a positive example in the whole group and promote the good practice of Lushi Expressway." Shu Yongxi, director of the Safety, Environmental Protection and Emergency Management Department of Shudao Group, said that "green water and green mountains are golden mountains and silver mountains", Shudao Group is actively promoting the ecological environmental protection of construction projects, changing extensive construction to refined construction, in addition to the implementation of standardized, standardized and unified "positive list", will also establish a "negative list", Chen listed the construction process is not environmentally friendly, not ecological, need to eliminate the behavior, so that all the personnel of the project construction are clearly understood.