news

china news service, ningbo, october 3 (zhang bin, ma jingbo) during the national day holiday, at the construction site of the jintang submarine tunnel of the china railway 14th bureau ningbo-zhou railway in qingzhi chemical industry park, beilun district, ningbo city, zhejiang province, operators and construction vehicles are constantly coming and going.

the ningbo-zhou railway starts from yinzhou district, ningbo city in the west and ends at dinghai district, zhoushan city in the east. it has a total length of about 77 kilometers and a design speed of 250 kilometers per hour. the jintang undersea tunnel is 16.18 kilometers long. it uses two shield machines to run from ningbo and zhoushan respectively. the opposite tunnel is currently the submarine high-speed rail tunnel with the longest length, largest diameter, most complex geology, and the most difficult construction in the world.

"the geological conditions on the ningbo side are complex. the tunnel first passes through the city and then the sea. it has to go under more than 40 risk sources such as oil pipelines, seawalls, docks, and access channels." hu hao, person in charge of the ningbo-zhou railway project of the china railway 14th bureau, said nearly 70% of the construction area of ​​the "yongzhou" shield machine is hard rock and unevenly soft and hard strata. it has to complete 12 sections of hard rock stratum excavation, and has gone through 24 changes in soft and hard strata. the stratigraphic and sea environment are extremely complex.

in may this year, after the "yongzhou" shield machine was launched, it has successfully passed through a 620-meter full-section hard rock formation. now it is entering the upper soft and lower hard composite formation. the shield driver needs to pay close attention to the tunneling posture of the shield machine. , adjust the excavation parameters, cutterhead speed and cutting pressure in time to ensure the smooth excavation of the shield machine.

hu hao introduced that this is an important stage of advancing project construction, and there will be many important nodes in the future. every day is particularly critical. during this national day holiday, more than 200 builders of the ningbo-zhou railway project gave up their rest and all staff stayed at their posts. always keep an eye on the progress of your homework.

after the ningbo-zhouzhou railway is opened to traffic, it will be possible to achieve 30-minute railway access from ningbo to zhoushan, ending the history of zhoushan being without railways. (over)