How much aggregate is used in the Hong Kong-Zhuhai-Macao Bridge?

Hong Kong-Zhuhai-Macao Bridge spans the Lingdingyang Sea outside the Pearl River Estuary, connecting Hong Kong, Macao and Zhuhai. In the past, it took three and a half hours to drive from Zhuhai to Hong Kong. With the opening of the Hong Kong-Zhuhai-Macao Bridge, the journey will be shortened to half an hour. So, how much aggregate is used in the Hong Kong-Zhuhai-Macao Bridge?

It is understood that the artificial island reclamation project of the Hong Kong-Zhuhai-Macao Bridge costs 1.6 billion yuan and uses 22 million cubic meters of sand. The surface of the 6.7-kilometer-long immersed tube is backfilled with stone, and the total amount of stone used is 2.5 pyramids, which is equivalent to the total transportation of 36,000 trains. These are just some of the projects of the Hong Kong-Zhuhai-Macao Bridge!

According to Xie Jun, general manager of Gree Hong Kong-Zhuhai-Macao Bridge Artificial Island Development Co., Ltd., the whole construction process of Hong Kong-Zhuhai-Macao Bridge includes the construction of four artificial islands. The demand for sand and gravel is astonishing: "The island is 28,000 square kilometers, and the filler is sand and stone.". In the final settlement, 22 million cubic meters of sand were used.

The island tunnel project is the core control project of the Hong Kong-Zhuhai-Macao Bridge, including two artificial islands with an area of 100,000 square meters and a 6.7-kilometer-long submarine immersed tube tunnel. It is the first offshore immersed tube tunnel in China and the longest, deepest and most technically difficult immersed tube tunnel in the world. The total length of the submarine immersed tube tunnel of the Hong Kong-Zhuhai-Macao Bridge is about 6.7 kilometers, and the deepest point is 48 meters deep. The tunnel consists of 33 prefabricated immersed tubes and a "final joint" about 12 meters long and weighing 6500 tons. Each standard section of the 33 immersed tubes is 180 meters long and has a maximum displacement of 80000 tons. Only such a single standard section has a larger displacement than a giant aircraft carrier. The surface of the immersed tube with a

total length of 6.7 kilometers needs to be backfilled. What is the total amount of stone used? No one can guess that 2.5 pyramids are equivalent to the total transportation of 36000 trains. These stones do not include the foundation that needs to be laid after the excavation of the basically equal-length submarine foundation trench, as well as the gravel that is used to "lay the mattress" for the immersed tube. The former is 2-3 meters thick, and the latter is 1.3 meters thick. Think about how many stones are needed?! The concrete factory of the

Hong Kong-Zhuhai-Macao Bridge, which requires high

quality of sand and gravel aggregates, will be equipped with an ice maker to add ice to the concrete when mixing it to achieve cooling. The concrete pouring temperature of the bridge is controlled within 28 ℃ (crack control technology of precast immersed tube concrete of super-large section of Hong Kong-Zhuhai-Macao Bridge), which meets the requirements of durability index. "We have initiated a concrete certification system in cooperation with Hong Kong and Macao. Every cubic meter of concrete and every grain of sand and stone in the Hong Kong-Zhuhai-Macao Bridge can be traced back to the source and have standards." Wei Dongqing, Chief Executive Officer of the Hong Kong-Zhuhai-Macao Bridge Authority, said. What is the emphasis on the gravel

used for bridge deck pavement? Zhu Ding, a project engineer of the

Hong Kong-Zhuhai-Macao Bridge, pointed out that in order to ensure the service life of 120 years, the Hong Kong-Zhuhai-Macao Bridge has adopted a large number of steel bridge decks for environmental protection. The pavement of this steel bridge deck is to overcome the problems of "anti-corrosion and rust removal" and "waterproof construction", and the second is to resist the rolling of vehicles and the cracking of pavement. What kind of gravel is used in asphalt has been tested repeatedly. The surface of the steel bridge deck should be paved with a layer of asphalt pavement with a thickness of 7 centimeters. The stones in the asphalt. "Zhu Ding picked up a group of" gravel samples "of different sizes in small display bottles:" Simply put, to resist pressure, that is, to resist the rolling of automobiles, we need to use big stones. " Pointing to a conical stone with a grain size of about one centimeter, Zhu Ding said, "This kind of stone has a good effect and needs to be specially processed in the factory. To resist cracking, that is, to resist cracking of the road surface, we have to use the finest stone grains, or even stone powder, so as to increase toughness. It is like playing Tai Chi. I will catch whatever force you have.."

"If it is not'factory 'production, how can we break out a cone with a uniform shape?"? Where is the uniform and huge yield of stone grains? With hand-hammered stones from a quarry? The quality is not up to standard, and the time is not enough.

It is understood that Jiangsu Shanbao Group Co., Ltd. has provided the overall solution of sand and gravel aggregate for Jiangsu Maodi Group, and the special aggregate for bridge produced by Jiangsu Maodi Group has provided a large number of high-quality bridge deck aggregate for the construction of Hong Kong-Zhuhai-Macao Bridge, which has provided sufficient power for the construction of national infrastructure. Fujian Nanfang Pavement Machinery Co., Ltd. has designed Zhongshan Aggregate Factory according to the use requirements of Hong Kong-Zhuhai-Macao Bridge to provide aggregates for the deck pavement of Hong Kong-Zhuhai-Macao Bridge. 22 million cubic meters of sand were used in the artificial island reclamation project of

the Hong Kong-Zhuhai-Macao Bridge. The surface of the 6.7-kilometer-long immersed tube is backfilled with stone, and the total amount of stone used is 2.5 pyramids (the volume of Khufu Pyramid in ancient Egypt is 2.5 million cubic meters), which is equivalent to the total transportation of 36,000 trains. These are just some of the projects of the Hong Kong-Zhuhai-Macao Bridge! The amount of sand and gravel used in the concrete structure of the Hong Kong-Zhuhai-Macao Bridge is also very large. Judging from the length of about 55 kilometers of the Hong Kong-Zhuhai-Macao Bridge, the amount of sand and gravel used in the Hong Kong-Zhuhai-Macao Bridge is at least 30 million cubic meters! Infrastructure construction in

Guangdong-Hong Kong-Macao Greater Bay Area continues to accelerate, and various reclamation projects use huge amounts of sand and gravel. On December 4, the main backfilling project of the third runway reclamation project of Hong Kong Airport officially started. The backfilling project of Section 3206 of Hong Kong Airport Third Runway Reclamation Project adopts medium sand cushion, sea sand and machine-made sand for hydraulic reclamation construction, with a quantity of about 30.05 million cubic meters.