* * * Chongqing Expressway Construction Process
20 10 according to the requirements of the State Council's "Yushu Earthquake Recovery and Reconstruction Master Plan" on improving the technical level and disaster resistance of national and provincial trunk highways, and improving the construction level and support capacity of Xining-Yushu Highway, Qinghai Provincial Department of Transportation immediately started construction of * * * and Yushu Expressway (namely * * * Jade Expressway).
20 14 12 18 After four years of construction, the first expressway crossing the permafrost region of the Qinghai-Tibet Plateau-the total length is 63.561km, and the estimated investment is 1 1.44 billion yuan * * and Yushu. * * * After the Chongqing Expressway (Phase I) was completed and opened to traffic, the travel time from Xining to Yushu was shortened by 2 hours. On April 26th, with the excavator breaking ground on the maduo county Plateau in Qinghai Province at the source of the Yellow River, the second phase reconstruction and expansion project of the first permafrost expressway and national highway in the Qinghai-Tibet Plateau to Yushu Expressway (hereinafter referred to as * * * Jade Expressway) started in an all-round way. The second single project is expected to be completed by the end of August 2065438+2006. The expressway is divided into two lanes and four lanes, with a design speed of 80 kilometers per hour. The starting point and the end point are Qiabuqia Town in Hainan Prefecture and Jiegu Town in Yushu County, Yushu Prefecture.
* * * Chongqing Expressway Construction Technology
How to effectively protect frozen soil and improve the stability of subgrade is the key to determine the fate of the project when constructing in permafrost regions. * * * In the design of Chongqing Highway, the existing research results of highway construction are fully used for reference, and detailed special geological exploration is carried out for permafrost along the line, and the design is carried out according to the principle of "protecting frozen soil and slowing down melting". Since the construction started in May, 20 1 1, * * Jade Highway * * has made 15 technological advances and innovations, two of which have won national patents, making a major breakthrough in key technologies of permafrost subgrade, bridge and culvert and tunnel.
Protecting frozen soil is the basic principle of engineering construction in permafrost regions in China. "G2 14 Demonstration Project of Qinghai-Tibet Plateau Trunk Highway Upgrading and Reconstruction" extensively integrates the existing scientific research achievements in the transportation industry, and systematically applies the existing technologies to "freeze" the frozen soil as much as possible to improve the stability and durability of the project. There are many long iron bar-shaped facilities in some sections of the * * * Chongqing Expressway and the shallow buried section of the tunnel, which are called "hot bars". Thousands of "hot rods" are inserted into the frozen soil layer, aiming at radiating the heat in the frozen soil, transferring the cold energy in the air to the soil layer, keeping the frozen soil layer frozen, and thus realizing the stability of the subgrade.
In the subgrade structure of some sections, culvert ventilation pipes with different diameters are also buried, so that heat can be taken away from the interior of the subgrade through airflow to achieve the purpose of thermal insulation; The roadbed of some sections is made of stone chips or pebbles of different sizes, and this kind of stone chip roadbed or gravel roadbed is also designed to effectively isolate frozen soil. In fact, many technologies for controlling frozen soil have been effectively applied in the construction of Qinghai-Tibet highway and Qinghai-Tibet railway, but it is the first time to apply them to the construction of high-grade highways on the Qinghai-Tibet Plateau on a large scale. Therefore, the accumulation of the previous years has also become the key to the success of the * * * Chongqing Expressway project crossing the plateau frozen soil area.
The above is the introduction of CBI Zhong Da Consulting on the construction of * * * Tea Expressway. For more information about expressways, please pay attention to the architectural knowledge column of Zhong Da Consulting.
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