The new speed of the subway, the new span of the bridge, the foundation of the world's largest sinking well, and the smooth delivery of the super-large ore ship. Less than the first quarter of 2021 has passed. These latest, largest and number one in the world have been refreshed by the Chinese transport builders!

176 kilometers! Running out of the new speed of China's subway

The top speed reached 176 kilometers per hour in the trial operation of Guangzhou Metro Line 18 on March 7th, setting the latest speed in China's current full underground operation of the subway! According to on-site inspection data from China Railway Research Institute Group Co., Ltd., during the train test run, the wheel-rail relationship and the bow-to-net relationship are in compliance with industry standards. Among them, vehicle stability, track quality index, and catenary smoothness are among the leading domestic indicators. Level.

China Railway Construction South China Construction Co., Ltd. adopted a large number of high-speed rail technologies such as 27.5 kV rigid contact nets, double-block sleepers and CP Ⅲ precision measurement in construction management to meet the design speed of 160 kilometers per hour.

The foundation of the world's largest underwater caisson was successfully sealed

On March 9th, 2021, the Changtai Yangtze River Bridge No. 5 main pier steel caisson was poured into the Changtai Yangtze River Bridge, the first cross-river passage on the Yangtze River that was constructed by the Second Navigation Bureau of China Communications Commission, which integrates expressways, intercity railways, and first-class highways. Completed, this is the largest underwater steel caisson foundation currently under construction in the world.

Changtai Bridge is located between Taizhou Bridge and Jiangyin Bridge. It crosses the Yangtze River to connect Changzhou and Taizhou. It is an important project in the comprehensive three-dimensional transportation corridor of the Yangtze River Economic Zone. Pier No. 5 is a new stepped caisson for weight reduction and erosion reduction. Its plane size is 95 meters long, 57.8 meters wide, and 64 meters high. It has 23 floors and is equivalent to the size of 13 basketball courts. It is currently the largest under construction in the world. Foundation of steel caisson in water.

A total of 42,000 cubic meters of concrete was poured on the bottom of the caisson, which is unprecedented in the construction of underwater concrete on the Yangtze River. After the pouring is completed, the total weight of the caisson will exceed 320,000 tons, which is heavier than the sum of the full displacement of the five "Liaoning" aircraft carriers, and can stably support the load of the main span of the bridge over a kilometer.

At the same time, the caisson is also equipped with the most advanced command "brain"-an intelligent monitoring system for the entire process of caisson construction first developed by the Second Aviation Administration of China Communications. More than 200 monitoring components are installed inside the caisson to automatically collect relevant data and display it on the monitoring cloud platform to monitor the attitude and structural stress of the caisson in the process of bottom sealing in real time. The whole process is measurable, visible, and Controllable to ensure the safety and accuracy of caisson construction.

The first arch of the Yellow River sets four "world firsts"

On March 15th, the overall improvement of the 300-meter arch ribs of the main span weighing 6,800 tons was completed. So far, the Qilu Yellow River Bridge constructed by the Second Public Bureau of China Communications Construction, the main bridge of the 420-meter span arch ribs marks the world’s largest, through-type mesh The construction of the main span of the tied arch bridge and the yellow passageway is further improved. In this overall improvement of the arch ribs, Closing Dragon has set four "firsts" at one time: the world's first lifting weight in the three-section method of bridge engineering, and its overall lifting weight is 6,800 tons, which is approximately equivalent to the weight of 220 Boeing 737 aircraft; For the first time on the Yellow River, the lifting and closing technology was adopted; for the first time in the world, bridges without separate closing sections were used for arch rib lifting and closing operations; the main span of the world’s largest through mesh tied arch bridge was completed, and it was the veritable "Yellow River First Arch" , The world's first hanging".

Chibi Yangtze River Highway Bridge adds the world's best

The Chibi Yangtze River Highway Bridge was successfully closed on March 16. The world’s largest span steel-concrete composite beam cable-stayed bridge constructed by Hubei Communications Investment Group and constructed by China Railway Bridge Bureau by China Railway Bridge Engineering Corporation was transferred to deck system construction, providing for the bridge’s early opening to traffic. A strong guarantee. The Chibi Yangtze River Highway Bridge connects Honghu City and Chibi City. The main bridge is 1,380 meters long. The entire line adopts two-way six-lane first-class highway standard construction. The design speed is 100 kilometers per hour. The main span is a steel-concrete composite beam cable-stayed bridge with a main span of 720 meters.

After the completion of the Chibi Yangtze River Highway Bridge, it will become an important node for the Wuhan City Circle Ring Expressway and the Suiyue, Shanghai-Chongqing, Hanhongjian, Beijing-Hong Kong-Macao, Hangrui and other high-speed highways, making the traffic of Honghu and Chibi free from the national transportation network. Seam butt.

During the construction of the Chibi Yangtze River Highway Bridge, innovative design methods and technological innovations have achieved a number of "world firsts". They have overcome large-volume platform concrete pouring, ultra-high main tower concrete one-time vertical transmission, and a large span of 720 meters. There are many world problems such as steel-concrete combined beam cable force and bridge alignment control.

Six ultra-large ore ships were successfully delivered

On March 16, the sixth 325,000-ton ore ship built by China Shipbuilding was successfully delivered. It was named "ORE ZHOUSHAN". The ship has a total length of 340 meters, a width of 62 meters, and a depth of 29.5 meters. It has a single continuous main deck. , Straight stern, square stern, with a capacity of 30 people, classified into American Bureau of Shipping and China Classification Society.

"ORE ZHOUSHAN" has the characteristics of green, safety, high efficiency, energy saving, etc. This type of ship can use heavy oil, diesel, MGO as fuel, has LNG READY function, is equipped with ballast water treatment equipment, desulfurization equipment, high-voltage shore power equipment, and SOx emissions It can be reduced to less than 0.1%, and it has the function of zero emission when docking. In terms of safety, the ship has adopted PAUT&TOFD flaw detection and equipped with a real-time stress monitoring system; in terms of energy saving, the ship has been optimized in the design stage, equipped with high-efficiency propellers, vortex fins, ultra-long-stroke main engines, and energy efficiency management systems. , Verified by actual ship, the speed is up to standard, and the fuel consumption per ton of nautical mile is leading. The ship can also meet the requirements of multi-port loading and multi-port unloading. It adopts advanced design concepts such as fast loading, one-person bridge building, and drone cabin, and its operation is efficient and convenient.

The longest underwater highway tunnel floor under construction in China penetrates

On March 18, the concrete pouring of the last floor of the Taihu Tunnel undertaken by the Third Company of the China Communications Third Aviation Administration was completed. The Mashan section of the Taihu Tunnel and the Nanquan section of the longest underwater highway tunnel under construction in China realized the "hand in hand" of the floor.

The Taihu Tunnel on the Southern Suzhou-Wuxi-Changzhou Expressway is 10.79 kilometers long and is currently the longest underwater highway tunnel under construction in China. The bottom plate of the Mashan section constructed by China Communications Third Aviation Bureau has a total length of 5,410 meters. The single-section bottom plate is poured with concrete of about 1200-2000 cubic meters. It belongs to "super-volume concrete" and has extremely strict requirements on all aspects of the construction process and concrete quality.

At present, the construction of the roof of the main line of the tunnel and the island in the lake is proceeding in an orderly manner. The entire project is expected to be completed and opened to traffic by the end of this year. After the completion of the Taihu Lake Tunnel, it will greatly enhance the function of the Shanghai-Nanjing Corridor as a major national comprehensive transportation corridor, and become a new engine driving the economic development of the Yangtze River Delta.