Eight years of grinding a sword, breaking the monopoly of foreign technology
In the past ten years, the international dredging market has been fiercely competitive, the scale of construction projects has become larger and larger, the technical threshold has been continuously improved, and there are high requirements for efficiency, cost and environmental protection. The international dredging market is basically monopolized by European companies, and international bidding. The large-scale dredging and filling project was mainly won by five or six large dredging companies with large dredging equipment in the world. With the large-scale dredging project and the need to expand into overseas markets, the demand for large-scale dredging equipment in China's dredging industry is becoming more and more urgent.
Before 2004, the whole ship design, key equipment and related technologies of large-scale cutter suction dredgers were mainly concentrated in Europe. In order to obtain high profits, the relevant companies have imposed technical closures and only provide complete ships and complete sets of equipment to China. The dependence on imports severely limits the development of dredging enterprises in China, and it is difficult to meet the needs of domestic infrastructure construction and participation in international competition. Therefore, the ability to design and build large-scale dredging equipment by itself is a technical guarantee for China to dredge a large country to dredge and strengthen the country, which has become the consensus of the dredging industry.
In 2002, Shanghai Jiaotong University was commissioned by China Communications Shanghai Waterway Bureau Co., Ltd. to develop the first large-scale cutter suction dredger in China. It was hydraulically driven, and the three-cable system was adopted for ship-moving and positioning. It was completed and put into use in 2004. This is the first in China. A large-scale cutter suction dredger was designed and built on its own.
After eight years of hard work, the project team summarized and mastered the key design technologies of large-scale cutter suction dredgers and related special dredging equipment, broke the technological monopoly of foreign companies, promoted the localization and technical development of supporting equipment, and realized The design and manufacture of large-scale cutter suction dredgers and related special dredging equipment have changed the situation that large-scale cutter suction dredgers and related special dredging equipments rely on imports, which has provided strong support for national major infrastructure projects.
Step by step, from the first domestic to the international leader
The large-scale cutter suction dredger developed by Shanghai Jiaotong University has formed a series. The technical indicators of the ship have reached the international advanced level, and the independent design and construction of large-scale cutter suction dredger has been realized, which has promoted the special technology of domestic cutter suction dredger. development of.
Among the cutter suction dredgers developed in this project, the “aircraft 2001â€, which was completed in 2004, is the first large-scale cutter suction dredger designed and built by China. The “multi-turn†built in 2006 is the first in China. The large-scale cutter suction dredger designed and built by domestic electric shaft driven underwater pump; the "Tiens" built in 2006 is the first large-scale twisting suction designed and built by China using shallow water inverted pile steel pile trolley. The dredger, its successful use is a milestone in the design and construction of large-scale cutter suction dredgers in China, marking the country's ability to design and manufacture large-scale advanced cutter suction dredgers; "No. 1" is the first large-sized cutter suction dredger with variable frequency drive, such as reamer, underwater pump, bridge winch and traverse winch designed and built by our company. The design of ship type, equipment and special dredging equipment and The dredging performance has reached the technical level of the most advanced cutter suction dredger of the same level in the world, which is more environmentally friendly, energy-saving and efficient. The “Tianzhu†and “Tianlin†built in 2009 are the first self-designed and built in China. Three cables System and steel pile trolley system Two sets of positioning systems and deck cranes were the largest non-self-propelled cutter suction dredgers in Asia at that time; the “Tian Whale†built in 2010 was the first self-propelled cutter suction dredger in China. It is the largest self-propelled cutter suction dredger in Asia and the third in the world.
According to Professor Tan Jiahua, the production capacity of large-scale cutter suction dredgers developed by Shanghai Jiaotong University has been continuously improved, gradually increasing from the initial 2000m3/h to 3500m3/h and finally reaching 4500m3/h. The cutter power has increased from 800 kW to 2000 kW. The power of the reamer of the "Sky Whale" self-propelled cutter suction dredger has reached 4,200 kW. At present, most of the dredging equipment of the cutter suction dredger is developed and designed by the institute. It is manufactured by domestic manufacturers. The shipping rate of domestic dredging equipment exceeds 95%, and the total cost is less than 50% of the same type of foreign ships. Compared with similar foreign products, It has the advantages of high cost performance and convenient maintenance service.
Show your skills and lead the development of dredging industry
The dredging industry involves the construction and maintenance of coastal waterways and inland rivers, the construction of coastal industrial zones, the development of coastal cities, sand extraction, mining, land reclamation, water conservancy and dredging, environmental protection and improvement, etc. An important industry for development. The cutter suction dredger is one of the leading ship types in the dredging industry.
In China, the construction and maintenance of large-scale deep-water port channels, the large-scale reclamation of coastal industrial areas and coastal cities, and the emerging industries of marine engineering are placing new demands on dredging. Before 2004, China's dredging volume was about 300 million cubic meters. In 2008, the dredging capacity was about 900 million cubic meters. China's dredging industry is developing rapidly and has become the third largest country in the world, but still can not meet the needs of the dredging market. This provides a broad application prospect and development space for large cutter suction dredgers.
According to reports, the 48 large-scale cutter suction dredgers that have been designed and completed have been built and put into use, with an increase of about 718 million cubic meters of annual dredging capacity and an annual output value of about 11.482 billion yuan. These large-scale cutter suction dredgers have become the main force in China's dredging industry, playing a huge role in land reclamation, port construction and channel dredging and generating huge social and economic benefits.
At present, the Shanghai Jiaotong University Ship and Ocean Engineering Design Institute is developing a new generation of large-scale cutter suction dredgers with the concept of “green dredgingâ€. A cutter suction dredger designed according to this concept is under construction and will lead the large-scale cutter suction in China. The development of dredgers.
Selection and precautions of hydraulic cylinders for excavators
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