A bundle of steel cables can withstand a stress of 500 MPa.
Like this“Divine power”How can I have？

June 12，Xinhua News Agency published《Innovation in a unit of measurement｜Behind 500 megapascals“Divine power”Break through》Reports，Gathering the Scientific and Technological Innovation Achievements of Liugong Owim Company，At present, the number of views of the report has exceeded 1 million.。

At Liugong Owim Company（Hereinafter“Overeem”）The cable workshop，The neatly arranged pay-off reels rotate at the same frequency，Steel wires as thick as the little finger are guided by the tractor.，Be bunched into a cable。

It is such a cable.，It has withstood 2 million fatigue tests under 500 MPa stress amplitude.，Hold it up“China Sky Eye”（FAST）The world's largest astronomical observation facility，It has also achieved a world technological breakthrough in the field of prestressing.，Behind it is three years of repeated experiments and the support of 12 independent and innovative patent achievements.。

How do these cables hold up?FAST，Let's start with prestress.。Prestress means a pre-added force。“It's like a barrel.，Put a tendon on the outside.，Hoop，The cask will not break when filled with water.。”Zou Yiqing, deputy chief engineer of Owim, said.，It is indispensable to many major projects.“Screw”，Widely used in bridges、Architecture、Rock and soil、Water Conservancy、Nuclear power and other infrastructure construction fields，It has a huge application market at home and abroad.。

Specific toFAST，It is a 500-meter aperture spherical radio telescope.，The reflecting surface has a main cable consisting of 6670 cables,、A huge and precise cable net project woven by 2225 downstay cables。“FASTIt's like the earth's big eyes are turning.，To observe the universe。SupportFASTThe cable net of displacement should have both elasticity and super fatigue resistance.。”Owim chief engineer Xie Zhengyuan said.。

Xie Zhengyuan further explained，BecauseFASTSpecial ways of working，The cable net with a span of 500 meters often changes frequently between a sphere and a paraboloid.，The maximum working stress amplitude of the cable shall reach 500 MPa.，Is the traditional standard 2.5x。

Achieve this cable fatigue performance that has never been achieved in the world，It's not easy。

“When I received the task，It feels almost impossible to achieve.。”Xie Zhengyuan's memory is still fresh。He said，Cable products available at that time，It will be broken after less than one hundred thousand times of tensioning.，Distance“2 million cycles fatigue test at 500 MPa stress amplitude”Requirements of，It's out of reach。

The researchers decided to have a try.，Try to improve the cable product structure and the anchoring structure。After three years of trial and error，They finally made a breakthrough.，Develop a suitableFASTThe finished cable used，O that the function of flexible displacement can be realized satisfactorily.。Initiate cold casting extrusion composite anchoring technology、Initiate the combined cable-making technology of high-strength prestressed steel wire and steel strand、Adaptive connecte mechanism of reflecting surface unit…… Many “Initiate”And“ Invention ”，It reflects Owim's determination to overcome difficult problems.。At“China Sky Eye”In the project，Owim has created 12 independent and innovative patent achievements.，Among them, there are 7 invention patents.。

The process of cable installation also brings together wisdom and innovation.。“FASTThe main net cable has 1454 specifications.，We have to spin our webs like spiders.，Use‘Suo’Knit a piece.‘The big net’。”Zou Yiqing introduced，Overeem bondFASTFeatures of spherical structure，Overcome all difficulties，The construction method of high-altitude cable net was invented.，The construction accuracy shall be controlled within 5 mm.，Finally, the task was successfully completed.。

In modern society，Prestressing applications are everywhere。Nowadays，Three Gorges Dam、Shanghai Maglev Line、Hong Kong-Zhuhai-Macao Bridge、Beijing-Guangzhou high-speed railway……An important project that enjoys a good reputation at home and abroad.，Are all active in the figure of Owim.。So far，Owim has won the National Science and Technology Progress Award five times.，More than 1260 patents have been authorized.，Countries leading and participating in the formulation、There are nearly 100 industry standards.，Won 6 Chinese patent awards。

The output value of Owim Company has also increased from several million yuan to more than two billion yuan per year.，2023，The company achieved sales revenue of 2,243,040,000 yuan.，Become the leading brand in China's prestressing industry。

This is inseparable from Owim's long-term persistence in innovation and vigorous investment.。Li Muhan, chairman of Owim, gave a set of figures.，Overeem has a national technology center.，There are nearly 300 technical research and development personnel.，Each year, research funding exceeds 3% of sales revenue%Above。“Your progress is slow.，Others will catch up.。Trying to stay ahead，We can only persist in innovation for a long time.。”Li Muhan said。

In addition，Owim also integrates excellent resources in the industry.，A post-doctoral workstation has been established.、Three Academician Workstations，With Tongji University、Southeast University has jointly established a research Institute.，These scientific research institutions bring new cutting-edge technology to Owim.，Make the company's products have a strong ability to update iteratively，Ensure the core competitiveness of products。

As a key technology in infrastructure construction，Huge market scale of prestressing at home and abroad，It is also ushering in a broader industrial prospect in the breakthrough of innovation.。“Insisting on innovation has enabled the company to provide its own strength in major infrastructure projects throughout the country and even the world.，It has broken the monopoly of foreign prestressing technology in many fields.。Future，The pace of the company's innovation will not stop.。”Li Muhan said。