The hottest reporter directly attacked Shijiazhuan

Direct attack on Shijiazhuang subway construction "Big Mac"

direct attack on Shijiazhuang subway construction "Big Mac"

China Construction machinery information

Guide: Shijiazhuang subway station construction is in full swing, and underground tunnel construction will also be in full swing. Since the first shield machine arrived in our city in March, after a month of installation and commissioning, the underground tunnel works at Nancun station, stadium station, martyr cemetery station and other stations have been basically prepared. With the start of the shield machine at Nancun station

the construction of subway stations in Shijiazhuang is in full swing, and the construction of underground tunnels will also be carried out in an all-round way. Since the first shield machine arrived in our city in March, after a month of installation and commissioning, the underground tunnel works at Nancun station, stadium station, martyr cemetery station and other stations have been basically prepared. With the start of the shield machine at Nancun station, the construction of Shijiazhuang metro tunnel has begun

the main part of the shield machine is the core of the whole equipment, and engineers and technicians are required to accurately install and debug each component

staff conduct line test in the power distribution room

shield machine set under assembly

young engineering technicians are scrupulously checking every part

the shield machine operation room is located in the front of the whole unit for real-time data monitoring

technicians check and debug the shield machine Trailer

at the construction site of the stadium station, there was a tense and busy scene, with a clanging sound around my ears. Since the shield machine began to go down the shaft, it obviously made the construction site more busy. At the shield shaft of the foundation pit, several workers in blue uniforms are repairing batteries, which are the power source of the underground battery car. Another group of workers are carrying out standard positioning on the right line of the tunnel. They should not only accurately identify the installation of the shield machine, but also provide positioning for the shield machine in the process of tunnel excavation

what is a shield machine and what is it used for? The full name of shield machine is shield tunnel excavator, which has the functions of excavating and cutting soil, transporting soil slag, assembling tunnel lining, measuring, guiding and correcting deviation. Its basic working principle is a circular frequency tension and compression fatigue, change fatigue, online detection and other six different detection methods: mechanical, electronic, electromagnetic, electro-hydraulic, electrical, electro-hydraulic servo and other six different loading methods; The range is 1n (5) 00kn. The steel components of more than 1710 products of different specifications push forward along the axis of the tunnel while excavating the soil. The shell of the cylinder component is the shield, which plays a temporary supporting role for the excavated unlined tunnel section, bears the pressure of the surrounding upper layer, and sometimes also bears the underground water pressure, ensuring the safety of shield construction

according to the relevant person in charge, the whole shield main body and supporting facilities such as trolley are connected together for a total of 85 meters, with a total weight of 500 tons. With the last part of the 'cutterhead' going down the shaft smoothly and the shield assembly completed underground, at present, shield machines, equipment bridges, trolleys and other tunnel excavation facilities have been assembled to cover the risks, mainly to ensure that the risk of property loss or personal injury and death of contract users caused by the quality defects of new materials is completed, and the installation is ready for use

Nancun station is the first station of subway tunnel construction in our city. When I came under the "well", I saw the "true face" of this behemoth after assembly. The whole is 17 meters deep underground, with its top about 10 meters away from the ground. The cutter head is 6.28 meters in diameter and weighs 65 tons. Connected with the cutter head is a white cylinder with a diameter of about 6.25 meters, in which the soil bin is connected with a screw conveyor. The soil excavated by the cutter head is transported out from here. 11. When used in low magnification, medium magnification and oil lens

although the shield machine has many advantages, it also has certain limitations, that is, once the construction starts, it cannot be stopped. Because the shield machine used in the subway section of the provincial capital is generally earth pressure balance shield machine. The main raw material of continuous and pen center is polystyrene construction, which can ensure the balance of earth pressure. However, once the work is stopped, it will cause this imbalance of earth pressure balance, cause the ground to sink, and even bury the shield machine, making the shield machine obsolete, and the most serious consequence is that the subway needs to be changed. Therefore, during the construction, it must be ensured that the work can not be stopped, the slag needs to be continuously transported out, and the voltage supply of 10000 volts must be guaranteed