This morning
Hong Kong-Zhuhai-Macao Bridge officially opened
But you certainly don’t know
Hong Kong-Zhuhai-Macao Bridge has 72 piers
It was built in Dongguan Hongmei.
The single pier has a maximum weight of 3510 tons
Created multiple firsts during the construction process
Laid a solid foundation for the Hong Kong-Zhuhai-Macao Bridge
▲Hong Kong-Zhuhai-Macau Bridge Pier manufactured in Dongguan
Manufacturing secret
The pier has a maximum weight of 3,510 tons, using steel bars to set a world record.
The construction of the pier of Hong Kong-Zhuhai-Macao Bridge is divided into three sections. The piers built by Dongguan Prefabrication are mainly used for the Qingzhou Waterway Bridge (China knot). The prefabrication site is located in Jinshasha Village, Hongmei Town, and belongs to the fifth project of CCCC. Co., Ltd., from the end of 2012 to June 2015, built 72 bridge piers for the Hong Kong-Zhuhai-Macao Bridge, a total of 113 (since some of the bridges are too large, too high, using prefabricated prefabricated piers), the single pier is the heaviest 3510 tons.
▲The first pier pier loading
There are 9 types of bridge piers built in Dongguan prefabrication yards, 40 types of models, a total of 229 concrete pouring, a maximum single casting amount of 974m3, a single pier with a maximum weight of 3510 tons. Three new technologies are used in the construction of the pier - large The technology of thick-coated epoxy steel bar processing, the vertical matching prefabrication technology of dry joints of bridge piers, and the vertical ship-loading technology of bridge piers are of great significance for shortening the bridge construction period and realizing rapid bridge formation, and creating bridge foundation structure construction. New method.
▲ undertake bridge deck
'The Hong Kong-Zhuhai-Macao Bridge is designed for 120 years of service, and the durability requirements of the pier are very high. This requires high quality control for the pier making process.' Zhang Wanda, a technician at the Dongguan Prefabrication Plant of the China Aviation Industry Corporation. In order to improve the corrosion resistance of steel bars, the project department uses large-diameter thick-coated epoxy steel bar processing technology to add epoxy coating on the outer surface of the steel bar for protection. However, the epoxy coating is very fragile, slightly bumped during construction, scraping蹭, will cause fatal damage to the coating, affecting the service life of the pier, so pay attention to the pouring accuracy in the concrete pouring process.
▲ green is epoxy steel
High-performance concrete with good corrosion resistance is used for pouring. This type of high-performance concrete has a large amount of cement used. Compared with ordinary concrete, it has different mixing ratios. At the same time, the outer surface of concrete is not allowed to be installed with embedded parts and Reserve holes to avoid corrosion channels.
▲Prestressed coarse steel bar
'The bridge pier is a large-scale assembly pier, the installation accuracy is in the millimeter level, and the precision of the fabrication of the butt joints of the components is very high. ' Zhang Wanda said. Because the pier is very high, the production and transportation is very difficult, the designer takes Sectional assembly, like building block type, inevitably creates seams after docking, which requires prestressed steel bars to strengthen the horizontal direction of the force to prevent loosening. The prestressed coarse steel bars used in the piers manufactured by Dongguan prefabricated yards are For the first time in the world, the thickest steel bars are used in large quantities, with a diameter of 75mm.
Sea thriller
Towed boat draught more than 4 meters, the shallowest point of the channel is about 5 meters
On June 18, 2013, the first pier was 26 meters high and weighed 2,650 tons. It was consigned from Dongguan to the construction destination. It was hauled to the construction water by a tow boat with a length of 120 meters and a width of 43 meters.
▲ bridge pier consignment
As the maritime department of Dongguan from the dock to the Meizhou waterway escort warning mission, the towing vessel has a complicated navigation environment through the flight section. In order to ensure the success of the first towing operation, the maritime department has formulated an escort plan in advance. 'We sent 3 sea cruisers The boat, 9 law enforcement officers, arrived in the waters near the starting point of the escort in advance, cleared the harbor pool, the waterway, and implemented traffic control on the navigable waters. ' The relevant person in charge of the Dongguan Maritime Bureau accepted an interview with the Dongguan Daily reporter: ' Towed boat draught more than 4 meters , and the shallowest point of the channel is only about 5 meters, which requires special attention.
▲ bridge pier consignment
When voyages through Pazhou Ferry, Dongguan Waterway Yanjiang Expressway and Pazhou Crossing Cable, the maritime personnel also implemented traffic control; when the towed fleet entered the dense waters of the Shatian port area, law enforcement officers reminded the passing ships to pay attention. Avoid, keep a safe distance and safe speed with the towing fleet. Until the towing fleet successfully arrived in the waters of Guangzhou, complete the escort mission.
This escort mission, the Dongguan Maritime Department has completed more than 100 times.
Like this manufacturing project in Dongguan!