Break the earth
After ten years of disputes and repeated revisions of the scheme, on August 26th, 20 1 year, the construction project of Slender West Lake Tunnel finally broke ground in Shugang Slender West Lake Scenic Area. The tunnel is an east-west passage north of Wenchang Road in Yangzhou City, located under the famous scenic spot Slender West Lake and the ruins of the ancient city in Yangzhou. The total length of the tunnel is 3.6 kilometers, of which the main tunnel section 1.28 kilometers was opened to traffic in September 20 14.
Construction scheme
The underground tunnel of Slender West Lake in Yangzhou is built on the principle of "the protection of the ancient city is supreme". By then, it will effectively alleviate the pressure of urban traffic congestion. Slender West Lake Tunnel starts from the intersection of Caohe Road and Shi Kefa Road in the east and ends at the intersection of Yangliuqing Road and Weiyang Road in the west. From east to west, it passes through the south side of Beimen Ruins Park, Friendship Road, Changchun Road, Slender West Lake Park, State Taxation Administration of The People's Republic of China Party School and Yang Zijiang Road, with a total length of 4.4 kilometers. The main construction contents include main tunnel, ramp, connecting road, wind tower and equipment management room.
Among them, the length of the main tunnel is 1.28 km, the design speed is 60 km/h, the single-pipe double-deck scheme is adopted, and two lanes are arranged on the upper and lower floors, with a diameter of 14.5 m, and the shield construction technology is adopted. The total investment of the whole tunnel and wiring project is about 2.046 billion yuan, and the construction period of the project is 3 1 month.
The problems of the world
The main shield section of Yangzhou Slender West Lake Tunnel is a full-face hard plastic clay stratum. This geological structure is a world-class problem in shield construction, because shield construction is cutterhead excavation, and the mud becomes slag, which is not hard and afraid of sticking. The shield machine used in the Slender West Lake Tunnel in Yangzhou is a mud-water balance shield machine produced by Herrick Company in Germany. It was once used in the construction of the famous Nanjing Yangtze River Tunnel and was tailored for the gravel geological structure. This kind of shield machine must be adapted when it is constructed in full-face hard plastic clay stratum, which has no precedent in China and is a world-class problem.
The slurry balance shield machine used in Nanjing Yangtze River Tunnel has a total length of1.34m, weighs about 4,000 tons, and the cutter head diameter is1.4.93m, which is equivalent to five floors. It consists of more than 20,000 parts. If the manufacturer Herrick of Germany is hired to carry out adaptive transformation, it will not only be expensive, but also the construction period cannot be guaranteed. China Railway 14th Bureau Group decided to transform. Under the guidance of domestic experts, they repeatedly optimized the construction scheme, carefully repaired and reformed, and finally controlled the error accuracy of the shield tail of the shield machine within two hairs. Their self-designed tool bit lug got rid of the monopoly of foreign manufacturers, which not only saved time, but also saved huge expenses and reached the international advanced level. Their successful transformation of the cutter head flushing system solved the long-standing problem of the mud-paste cutter head, which was well received by experts from Herrick Company in Germany.
green building
Slender West Lake is a national 5A-level scenic spot with many historical sites such as Tang Cheng and Song Cheng. Shield construction can effectively protect cultural relics and protect ancient cities.
The construction scheme of Slender West Lake Tunnel in Yangzhou has strict requirements for cultural relics protection, environmental protection and settlement control. Once these problems are successfully solved, it will provide valuable reference experience for the construction of super-large diameter shield in complex geological conditions in China.
Yangzhou is a famous historical and cultural city, and Slender West Lake has been called "the first garden in the world" since ancient times. Therefore, the construction of Slender West Lake Tunnel requires extremely high cultural protection, water saving and environmental protection. In order to realize "green construction", the construction party, China Railway 14th Bureau, organized experts to carry out the key project "Green and Environmental Protection Construction Technology for Mud Water Treatment in Clay Strata in Shugang-Slender West Lake Scenic Area". Environmental experts' demonstration meeting was held to innovate and upgrade the domestic advanced mud-water separation equipment used in Nanjing Yangtze River Tunnel, which was used for mud treatment in Slender West Lake Tunnel, so as to effectively separate large particles of muck.
For the particles below 10 micron, which are difficult to be completely separated, they are led to the abandoned pond through pipelines to minimize the environmental interference to Slender West Lake. At the same time, scientific and comprehensive comprehensive control measures are taken in the aspects of construction dust, noise control and light pollution control, so that all control indexes meet the national requirements.
Engineering construction will inevitably produce construction waste. In the control and treatment of construction waste, the Slender West Lake Tunnel Project will hand over all solid waste to professional units for removal and standardized treatment. At the same time, a strict construction waste reduction plan was formulated at the beginning of construction. According to the relevant national standards, 10,000 cubic meters of construction waste is strictly controlled within the index, and the useful part is recycled, with a recovery rate of 30%.
According to estimates, the utilization rate of earthwork construction waste in Slender West Lake Tunnel Project is above 60%. Environmental professionals praised it as a very rare achievement.
Due to its outstanding performance in engineering culture protection, environmental protection and soil and water conservation, Yangzhou Slender West Lake Tunnel Project was listed in the third batch of "National Construction Industry Green Construction Demonstration Project" published by China Construction Industry Association 20 13.
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