The hottest Yangtze River Third Bridge will erect

The Third Yangtze River Bridge will erect the "China's first steel tower" with a maximum lifting of more than 200 meters

the Third Yangtze River Bridge will erect the "China's first steel tower" with a maximum lifting of more than 200 meters

highly effective China Construction machinery information

Guide: at 9:50 a.m. on September 9, with the issuance of the lifting order, at the construction site of the north pier of the Third Yangtze River Bridge, A huge steel block with a weight of 150 tons, the steel tower column of the first section of the third bridge (T1 section) is slowly lifted from the zhenhanggong 2818 berthing ship with a lifting weight of 1200 tons, and slowly moves towards the lower tower column of the North Tower

at 9:50 a.m. on September 9, with the issuance of the lifting order, at the construction site of the north pier of the Third Yangtze River Bridge, a huge "steel block" weighing 150 tons - the protection and maintenance of the pressure blasting experimental machine for the steel tower column of the first section of the third bridge (T1 section): it is being slowly lifted from the mooring ship of "zhenhanggong 2818 with a lifting weight of 1200 tons", Slowly move towards the lower tower column of the North Tower...

a section of steel tower column is about 2 floors

does a section of steel tower column look small now? Li Jiaxian, a technical consultant at the lifting site and an engineer of the former Bridge Engineering Bureau of the Ministry of railways, said excitedly, "why not? A section is two stories tall, 6.8 meters long, 5 meters wide and 8 meters high, with a volume as large as a medium-sized suite and a weight of 150 tons. The whole three bridge steel tower has 94 sections, and its 215 meter height can be called 'China's first steel tower' after its formation."

standing on the cross beam of the cable tower more than 40 meters high, Li Jiaxian pointed to the steel tower column being slowly lifted and told him that the part above the cross beam under the cable tower of Nanjing Third Bridge was of all steel structure, which was the first in China, and the arc design of its steel tower column was also the first in the world

the gap error between the two steel tower columns is not more than 1mm

it was seen on site that after the steel tower column was slowly lifted up, it began to dock with the base of the cable tower beam. On site technical experts said that after 4000 bolts are used to connect the two steel tower columns, the gap error cannot exceed 1mm, and the technical requirements are very high

it is noted that 12 "jacks" are placed around the tower base of the cable tower beam in all directions. The on-site construction personnel said that these instruments, which are usually used to move "big guys", are now only used to "fine tune" the position of the steel tower column to ensure successful docking

on the one hand, the installation accuracy and the manufacturing process requirements are also very high. The cross section of the steel tower column is required to be like a mirror, and the technical concave convex difference cannot exceed 0.25mm at most. Chen Xin, the director of the Third Yangtze River Bridge project and academician of the Chinese Academy of engineering, touched the steel tower column under "fine adjustment" with his hand and said that after the technical breakthrough of domestic and foreign scientific research institutes, the steel tower was finally manufactured by China Railway Baoji Bridge factory. Because the steel tower column is too heavy, they can only carry out bulk transportation. Finally, they choose to assemble it in Anqing and then transport it to Nanjing

after the hoisting of the steel tower is completed before the end of the year, it is noted that beside the cable tower beam, there is also a high hanging tower for the precautions of debugging the universal tensile testing machine. Lou Xuequan, deputy chief commander of the Third Yangtze River Bridge Construction Headquarters, said that because the single section weight of the steel tower column is between 130-180 tons, and the maximum lifting height is more than 200 meters, the general crane cannot complete it. Therefore, two giant cranes are specially customized from Botan company of France to undertake the lifting task. The height of the hooks of these two balanced tower cranes can reach 232 meters, and their scale ranks first in the world in the same type. It is expected that a total of 94 steel towers with two herringbone shaped steel towers of the third bridge will be hoisted by the end of this year, and then the third bridge will be transferred to the stage of bridge deck hoisting. At that time, the beautiful scenery of the third bridge will be displayed in front of you

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the world's first "crane" is 252 meters tall

the third Nanjing Yangtze River Bridge entered the steel tower hoisting yesterday, and the "human" steel tower will be the most obvious sign of the third bridge. In order to complete the hoisting, the third bridge construction headquarters specially customized two extra large tower cranes from abroad, with a height of 252 meters, which are the tallest tower cranes in the world

the two "human" steel towers of the third bridge are a major difficulty in the construction of the third bridge. The tower is 215 meters high, and its main part is assembled from 94 steel sections. It is the first time in the history of bridge construction in China that all steel materials are used. The arc design of its steel tower column is also the first time in the world. There is no relevant experience at home and abroad to learn from, and the requirements for steel tower hoisting construction technology are very strict

the weight of a single section of the steel tower column is 130-180 tons, and the maximum lifting height is more than 200 meters. The lifting capacity of the corresponding equipment is required to exceed 3000 tons/meter. To this end, through international bidding, France Botan company has customized two large cranes for the third bridge. The total weight of the structure is 900 tons, and the maximum lifting capacity is 180 tons. These two tower cranes adopt a balanced structure, and their scale ranks first in the world among the same type of tower cranes. The value of one tower crane is up to 85million yuan. At present, the first "crane" of the north pier has been installed. Although it is only about 100 meters high at present, this "big high" can automatically "grow" to a lifting height of 252 meters in the river with the rise of the cable tower of the third bridge