Adhering to the Concept of 'Intensive, Smart and Ecological', Xining's Underground Utility Tunnel Will Be Built into a National Model
2016-11-04
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The underground utility tunnel is an important part of urban infrastructure construction. It can not only gradually eliminate urban problems such as repeated road excavation and overhead cable clutter, but also make good use of underground space resources, improve the city's comprehensive carrying capacity, enhance the quality of new urbanization development, and create new drivers of economic development. It is a "century project" that improves people's livelihood and serves the public.
Design adheres to the concept of "intensive, smart and ecological"
As a provincial capital city, Xining urgently needs to improve and reorganize its municipal supporting infrastructure, and a large number of power cables need to be laid underground. To avoid the waste caused by repeated road excavation due to pipeline burial or maintenance and to improve the level of municipal supporting services, the construction of underground utility tunnels is very necessary. In 2016, Xining actively responded to the call of the State Council and the provincial government to strengthen utility tunnel construction and launched the construction of Xining's underground utility tunnels.
Xining's underground utility tunnel is one of the important landmark projects of China's first batch of pilot modern new urbanization infrastructure construction, and is also a key project and window project of Qinghai Province and Xining City. The design of Xining's underground utility tunnel adheres to the concept of "intensive, smart and ecological", applies modern information technology, new processes, Internet of Things technology and the sponge city concept, and has achieved the full entry into the tunnel of all eight major municipal pipeline systems, including power, communications, reclaimed water, heating, gas, rainwater and sewage. Its design represents the advanced level in China's underground utility tunnel construction field.
The project planning scope covers the entire city and is implemented in batches and phases
According to the plan, the planning scope of Xining's underground utility tunnel project covers the entire city, with a total length of 624 kilometers. The planning scope includes Xining's central urban area, Duoba New Town, Ganhe Industrial Park, and the urban areas of Huangzhong County, Datong County and Huangyuan County. Utility tunnel planning follows the principles of unified planning and coordinated advancement; one-time planning and phased implementation; contiguous network formation in new areas; implementation in old areas in combination with road widening and reconstruction, old city renovation and subway rail construction; and priority implementation of main lines, implemented in batches.
The main line of Xining's urban utility tunnel in the central urban area is a large cross-shaped backbone network. On the basis of this backbone network, regional main lines are arranged by district, and then branch lines are arranged according to road and pipeline planning conditions, forming a complete and comprehensive utility tunnel system. The central urban area is equipped with 1 main monitoring center and 5 sub-monitoring centers. Some utility tunnels will also be equipped with engineering maintenance vehicles.
"Problems indicate hope, and technology leads the future." "If conditions permit, we must proceed; if conditions do not permit, we must create conditions and proceed." In this difficult rush construction in an "unfamiliar" environment, the builders of the Northwest Company of China Construction Eighth Engineering Division met difficulties head-on and grew braver with each setback. The various new processes and technologies they explored and summarized filled many gaps in China's underground utility tunnel construction field and provided first-hand valuable documentation for utility tunnel construction in other cities.
Innovation 1: Taking the lead in using aluminum alloy formwork and successfully applying it to underground utility tunnel construction at the Xining site. Aluminum alloy formwork is a new type of construction material with multiple advantages such as light weight, reusability and easy operation. After simple assembly, it can easily achieve a fair-faced concrete effect and is a key component for realizing "factory-style, flow-line" construction of urban underground utility tunnels;
Innovation 2: Comprehensively utilizing the integrated fusion technology of 3S, including remote sensing, geographic information systems and global positioning systems, and BIM building three-dimensional information models, to achieve refined design of underground utility tunnels and urban underground space, running through the entire process of planning, design, construction and operation.
Innovation 3: Actively promoting the aluminum formwork sliding system and composite slab technology to realize the development of prefabricated industrialization in construction engineering. Using these new processes and technologies, the ingenious design of combined rainwater and sewage, box culvert entry into the tunnel, and two forms of gas entry into the tunnel is easily achieved.
Innovation 4: Exploring and summarizing collapsible loess replacement and compact pile construction, solving the problem that the geological structure of collapsible loess has extremely poor stability and that building utility tunnels on it makes product quality difficult to guarantee.
In all these ways, during the construction of Xining's underground utility tunnels, there are many more innovations like these. Numerous top technologies and first-class processes are cleverly integrated here, promoting each other and jointly driving the continuous progress of the Section 1 project of the Northwest Company of China Construction Eighth Engineering Division......
Actively assuming social responsibility and putting the concept into practice
In addition to leading by example in the construction field, the builders of the Northwest Company of China Construction Eighth Engineering Division also actively assume social responsibility. They increased funding for the "four savings and one environmental protection" and truly put the construction concept of "intensive utility tunnels, smart utility tunnels and ecological utility tunnels" into practice. In terms of plant layout, the project department adapted to local conditions and, using the natural terrain, successively set up office areas, living areas, activity areas and a large material processing plant. All offices and living quarters are built with high-standard movable container-type prefabricated houses, maximizing material, energy and land savings. In terms of the processing plant, the project department adopted centralized production and unified distribution, turning it into a modern logistics center. All materials required by the sites must be tested, processed, produced and dispatched from here, effectively avoiding the waste of space caused by decentralized processing and stacking. The processing plant is equipped with large gantry cranes that can meet the lifting and transportation requirements for all materials. There is also a fully intelligent rebar processing machine, also a "star" in this processing plant. It occupies little space and is easy to use, and can tailor rebar processing to actual needs, truly achieving "zero loss" material savings......
Xining's underground utility tunnel, led by the Northwest Company of China Construction Eighth Engineering Division, fully demonstrates the concept of "intensive, smart and ecological" and will become a model for domestic utility tunnels; it will provide solid infrastructure support for advancing Xining's new urbanization construction and promoting urban transformation and upgrading; and it will lay a solid foundation for building a moderately prosperous society in all respects, building a "Happy Xining" and writing the Xining chapter of the "Chinese Dream".
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