News Information - Chenxin Heavy Industry (Jiangsu) Co., Ltd

News Information

中国制造钢结构将助力提升巴西铁矿石运输能力中国上海，2022年9月23日——淡水河谷与辰信重工（江苏）有限公司（“辰信重工”）今日就巴西托坎廷斯河新铁路桥建设项目钢结构供应签署协议。该协议由淡水河谷中国区采购总监安凯（Antonio Cardoso）先生与辰信重工董事长史云龙先生于今日下午在上海共同签署。根据协议，辰信重工将向淡水河谷供应约8600吨钢结构，用于巴西托坎廷斯河新铁路桥的建设。托坎廷斯河新铁路桥全长2.3公里，将建于帕拉州马拉巴市托坎廷斯河上方。托坎廷斯河现有一座老铁路桥，系卡拉加斯铁路（EFC）的一部分。新铁路桥将建在老铁路桥上游300米处，建成后将使卡拉加斯铁路47-48路段变为复线。卡拉加斯铁路由淡水河谷运营，连接位于帕拉州卡拉加斯地区的淡水河谷北部运营区和位于马拉尼昂州圣路易斯市的淡水河谷马德拉港海运码头，该铁路运输的主要货物为铁矿石。新铁路桥建成后将提升卡拉加斯铁路的运输能力，改善铁路的交通流量，并降低商业风险。“淡水河谷正在多管齐下，努力恢复铁矿石产能，从而为中国持续供应优质的铁矿石产品。提高北部系统物流能力是我们实现中长期生产目标的关键举措之一。我们很高兴有新的中国合作伙伴加入这一重要征程。我们相信，这将进一步巩固我们与中国之间持续近半个世纪的合作伙伴关系，并将为巴西和中国这两个金砖国家之间的双赢合作树立又一典范。”安凯先生表示。史云龙先生表示，此次合作将成为辰信重工发展历程的重要转折点，将使辰信重工实现重要进步和提升，他期待辰信重工未来能成为淡水河谷的战略合作伙伴。关于辰信重工辰信重工（江苏）有限公司（“辰信重工”）位于江苏省泰兴市虹桥工业园区内，其钢结构生产基地占地30万平方米，年产能超过10万吨。公司还拥有钢结构安装业务，年安装能力达到25万吨。 Release time：2023-05-12

Model theory: Solving the problem of low age of orthotropic Predicting structural life is one of the difficult problems in engineering. The service life of orthotropic steel bridge deck is much lower than the design expectation. Multiple fatigue fractures not only reduce the bearing capacity of the structure, but also are very difficult to repair, which has become a difficult heart disease in the bridge industry. The reason is that the load effect does not match the fatigue resistance of welded joints.Fatigue is the result of the interaction between joint damage and repeated load. On the one hand, it is difficult to determine the damage distribution and type of ultra long and high-density U-rib weld of orthotropic steel deck; On the other hand, the location, size and frequency of the moving load acting on it are not clear, so it is more difficult to determine the expected life of this kind of bridge deck.The fundamental to solve the problem is to realize low damage and high quality welded joints. Limited by the closed structural space of U-rib, the one-sided partial penetration weld is used to connect with the top plate, so that the non penetration part becomes a crack like notch, which greatly reduces the joint resistance.Details improve behavior, damage control life, and process determines success or failure. The domestic original bilateral submerged arc full penetration welding process has been successfully used in U-rib welding, which greatly improves the fatigue reliability of the joint and becomes a sharp tool to crack the low age of orthotropic steel bridge deck.current situation: young diseases become a problem Orthotropic plate steel bridge is an outstanding work of applying welding technology to bridge structure in the 20th century. It has been widely used in bridge engineering all over the world for more than 70 years because of its reasonable structure, economical material use and meeting the complex stress requirements of bridges to the greatest extent. The length and density of welds in steel bridge deck are inferior to all welded structures. However, the design service life of the bridge for up to 100 years is the highest welded structure standard and requirement.The aging of orthotropic steel deck is mainly controlled by the longitudinal weld zone of super long U-rib. During the operation and service period, multiple longitudinal fatigue cracks with uncontrollable shape, length, location and quantity occur randomly, which not only prematurely reduces the service function of the bridge, but also has a very low success rate and high repair cost. The low age disease of orthotropic steel bridge surface has become an unsolved problem in the bridge industry. According to the statistics of Japan in the 1970s, the service life of through cracks on bridge decks passing through 3000 large vehicles in 12 hours is about 10 years. In comparison, the time of disease in China is shorter.After the fatigue crack propagates and penetrates the bridge deck, it will accelerate under load. When the length and number increase, the bearing function of the structure decreases significantly. The difficulty of repairing and strengthening the bridge deck can be seen from figures 3 and 4. Welding repair is effective in a short time, but has not been successful in a long time.welded joint: connection of concentrated structure life The welding thermal process not only coarsens the micro metal structure and reduces the comprehensive mechanical properties in the joint area, but also forms geometric defects such as internal and external defects, undercut, incomplete penetration and incomplete fusion, but also forms mechanical, chemical, metallurgic and geometric discontinuities in the joint area. Geometric defect is a "crack like notch" in fracture mechanics, which is the same as welding crack. It is the most important factor to cause fatigue crack and control life. The fatigue test results of 128 welded steel beams are summarized in the report no. 147 of the national highway cooperative research program (NCHRP), which shows that the fatigue cracks originate from small defects in the weld. In most of the fatigue life, the fatigue crack is semi elliptical and propagates along the plate thickness. The crack propagation process through the plate thickness accounts for about 80% ~ 95% of the fatigue life, depending on the details. From this point of view, the influence of mechanical discontinuity on welding residual stress is much less than "notch effect".The fatigue resistance of welded joints is not directly related to the size of welds, nor to the yield strength of structural steel (FY ≤ 960mpa), but is determined by the damage to the joint area during welding (crack like notch).German Welding master D. radaj used "the best welding structure is the structure without weld", indicating the inevitability of defects in welded joints. Professor Xu Jinquan, author of fatigue mechanics, also expressed the concept of defect control life as, "All things have defects, and they will produce defects by themselves. Defects are born and die constantly and have a cumulative potential. Their potential changes from strong to weak, so the number of all things varies. Look at their images, observe their theories, form their potential, know their numbers, and how they exist. If numbers are contrary to each other, they will be false, theories will be contrary, and images will be false, so it is important to know numbers."The welded joint between U-rib and bridge deck is inclined T-shaped (70 ° ~ 75 °), which is a T-shaped welded joint. American Bridge Welding Code (AASHTO / AWS d1.5m / d1.5) The T-joint has the following provisions: the fillet joint and T-joint that bear bending parallel to the joint axis must be designed to avoid tensile stress concentration at any weld root. When the T-joint adopts bilateral partial penetration weld, the non penetration part is regarded as a defect, the fatigue resistance is lower than that of the penetration weld, and its reduction coefficient is in the American code for design of building steel structures (ANSI / AISC 360-10) is calculated according to the incomplete penetration length and expressed as rpjp & lt; 1.For a long time, orthotropic plates all over the world have been welded outside the U-rib to form a partially penetrated single-sided weld, which has become a special case of violation.confusion in predicting fatigue life Predicting the structural life is a process of predicting damage propagation, which is a major problem in the engineering field. The bridge design code can only use the expected value for the structural life. The design service life ≥ 100 years is the expected life of the structure, which is limited to the occurrence of visible cracks without repair. Under the condition of clarifying the crack location and the nominal stress amplitude level of material mechanics, the S-N curve method is used to evaluate the structural life The S-N curve is determined by the fatigue test statistics of typical welded joints. The life can be expressed as: n = C · s-mS is the unidirectional stress amplitude obtained by the method of material mechanics. For complex stress system, it needs to be simplified.The fatigue life is predicted by the method of fracture mechanics Δ K and initial damage A0 are obtained:Due to the uncertainty of the location, size and frequency of the acting load on the orthotropic plate, the damage distribution and damage degree of the bridge deck structure during the operation period are also uncertain, and the nominal stress at the damage is difficult to calculate accurately. Many factors can not form a definite relationship, when and where fatigue cracks will occur, and the prediction of life is also difficult to be accurate.Because the stresses of the first system and the third system of orthotropic bridge deck are orthogonal, they have no effect on fatigue, and the prediction of fatigue life will be different.The failure criterion of fatigue life is the appearance of visible cracks, and the surface length of penetrating cracks is more than 3 times the plate thickness.The fatigue life is determined according to the equal fatigue damage principleThe orthotropic bridge deck is multi span continuous in the longitudinal direction, and the multiaxial effect makes the repeated times of the live load action of the third system greatly exceed that of the main structure of the first system. According to the principle of equal fatigue damage, when the main structure fails, the constant amplitude fatigue life of the bridge deck is n Ⅰ, and the crack length a Ⅰ is the same as that of the bridge deck a Ⅲ, the constant amplitude fatigue life of the bridge deck is n Ⅲ & gt; n Ⅰ, which can Avoid the early occurrence of fatigue cracks in bridge deck.According to the standard fatigue vehicle loading in the domestic highway code, assuming that the vehicle crosses the bridge once, and considering the multi axle effect of the loaded vehicle, the loading times of the third system are k times that of the first system. Because the transverse loading is not sensitive to the longitudinal wheelbase, when the diaphragm spacing is set as 3M, k = 2.5 and the constant amplitude loading times n Ⅲ = 2.5 × two × 106=5 × 106. Therefore, the first system and the third system of orthotropic bridge deck should be designed according to different life to delay the occurrence time of fatigue cracks in bridge deck.Equal damage and unequal life design method is also one of the fatigue design principles of aircraft structures.the best countermeasure against fatigue The high quality of welded joint needs the process to realize. Taking the rolled T-shaped steel as the standard, it is determined as the process goal of U-rib welded joint.For welded joints, the design and process criteria formulated by the International Welding Association (IIW) are "not perfect, but suitable for use". When applied to u ribs, it can be specifically the process index of "striving for low defects and high quality".The U-rib non grooved internal and external submerged arc welding process is adopted to realize full penetration and high-quality welded joints that can effectively control welding defects. The U-rib non grooved welding has small filler metal, and the welding deformation and residual stress are correspondingly reduced. The submerged arc welding under flux protection has stable thermal process, good forming, few defects, and the penetration rate can reach 100%, which is more helpful to improve the fatigue resistance The ribbed plate adopts intelligent equipment for welding and industrialized high-efficiency production, and the full-length detection of the weld is realized, so that the product quality is stable and reliable.confirmatory fatigue test Through the fatigue tests of different models, it is verified that the U-rib full penetration welded joint has good fatigue resistance and reliable welding process, as shown in FIG. 17, 18 and table 1.It is the basic concept of fatigue resistance of welded joints and the expression of the concept of welded structural integrity design.From unilateral to bilateral welding, the performance of U-rib welded joint has changed substantially. The implementation of full penetration bilateral submerged arc welding process has optimized the joint quality and greatly improved the fatigue resistance. The goal of ultra long U-rib welded joint, ultra long service life and low maintenance has been realized. It reflects the contribution of made in China to the development of bridges in the world. At present, this process has been officially used For highway and railway bridges, the low age cracking of the fatigue resistance of orthotropic steel bridge decks allows bridge engineers to obtain more space in optimizing the thickness of bridge decks and the spacing of diaphragms, making lightweight steel structures more internationally competitive."Economic index is an important standard for evaluating technical level" will not change over time. Release time：2021-09-26

Leading the development direction of domestic weather resistant bridge ! The bridge is known as the "pearl on the crown" of civil engineering. With the rapid development of China, a number of world-class super large projects are emerging, which are destined to become milestones and symbols of the new era.Compared with large-scale construction projects such as skyscrapers, stadiums, ports and docks, bridges not only need to bear their own load, but also have to withstand the huge impact of cars and trains passing at high speed and the test of various adverse weather conditions in the open air.With people's personalized demand for bridge steel construction, weather resistant bridge steel came into being.Weathering bridge steel (i.e. atmospheric corrosion-resistant bridge steel) can be developed and innovated continuously after being integrated into the new mechanism, new technology and new process of modern metallurgy. It is one of the series of steel types at the forefront of Super Steel Technology in the world. Weather resistant bridge steel is made of low alloy steel with a small amount of corrosion-resistant elements such as chromium, copper and nickel. By forming a dense oxide rust layer on the surface of the steel plate, it can effectively block the infiltration and transmission of corrosive medium and reduce the corrosion rate in the atmospheric environment. With the characteristics of strength, toughness, plastic extension, forming, welding and cutting, abrasion, high temperature and fatigue resistance of high-quality bridge steel, its weather resistance is 2 ~ 8 times that of ordinary carbon steel, which can be thinned, exposed or simplified for coating. The steel has the characteristics of rust resistance, corrosion resistance, life extension, thinning and consumption reduction, labor saving and energy saving, which can benefit component manufacturers and users. The coating cost saved by using weather resistant bridge steel is generally more than 10% of the construction investment. In recent years, as a "green" new material with long life, energy saving and environmental protection, weather resistant bridge steel conforms to today's concept and national development policy guidance, and its R & D and promotion are of great economic significance.weathering bridge beam steel Six advantages of Hegang Wugang are highlightedThe height of the product determines the height of the enterprise. WISCO continues to focus on the re optimization of "two structures", guided by the demand of high-end customers and the high-quality development trend of the industrial chain, constantly promotes product upgrading and creates more "world first", "domestic first" and "singles champion" products. Standing at the strategic height of maintaining the safety of the national industrial chain, leading the high-quality development of the industry, and improving the core competitiveness and brand image, Wuhan Iron and Steel Co., Ltd. has developed weather resistant bridge steel with various specifications and strong technical advantages, taking the R & D and promotion of new bridge steel as its own responsibility, leading the development direction of the new bridge steel market.At present, Wuhan Iron and Steel Co., Ltd. of Hegang can produce weather resistant bridge beam steel with yield strength of 235mpa ~ 690mpa according to GB714, GB1591, ASTM a709, en10025 and other standards. According to Dr. Gao ya, head of R & D in the field of bridge steel and vice minister of science and technology of Hegang Wugang, compared with many bridge steel manufacturers, the weather resistant bridge steel developed by Hegang Wugang has six unique technical advantages.First, the steel is pure. Phosphorus content ≤ 100ppm, sulfur content ≤ 30ppm, oxygen content ≤ 15ppm, nitrogen content ≤ 60ppm, hydrogen content ≤ 1.5ppm. The contents of these elements are lower than the standards specified by the industry. Second, low-carbon design. It can ensure good welding performance and can be welded directly without preheating, which is convenient for customers' later installation and production. Third, good low temperature toughness. It can meet the requirements of impact energy above 150j at - 40 ℃. Fourth, the weather resistance index is high. Weather resistance index ≥ 6.0 (more than 6.5 can be achieved), which can resist atmospheric and seawater corrosion and prolong service life. Fifth, excellent lamellar tear resistance. It can meet the requirements of Z35 level and is applicable to the range of beam column joints connected by welding technology with strong joint constraints and bearing the tensile force along the plate thickness direction. The national standard gb5313 "thickness direction performance steel plate" is formulated by the representative industry of Hegang and Wugang. Sixth, green environmental protection, thinning and consumption reduction. TMCP + tempering and other methods are adopted for delivery, with short delivery cycle, which can reduce the manufacturing cost for customers.In addition to the incomparable advantages of the above six other steel manufacturers, the weathering bridge steel currently developed by Hegang Wugang is divided into three categories in terms of supply status and process performance.One is TMCP, TMCP + tempered weathering bridge beam steel. Representative brands mainly include q345qenh, q370qenh, q420qenh, etc. the maximum production thickness is 80mm, and the executive standard is gb714-2015. The other is controlled rolling and normalized weathering steel. Representative brands include q355nhd / E and s355k2w produced by controlled rolling and normalizing process, and the Executive Standards are GB / t4171-2008, GB / t4172-2000, en10025-5, etc. The other is quenched and tempered weather resistant bridge beam steel. The representative brand is a709m-hps485w, which is produced by quenching and tempering process; The maximum production thickness is 90mm (TMCP + tempering production can be realized below 50mm); The executive standard is ASTM a709.steel plate River steel dance steel On July 12, 2011, all the steel structures used for the construction of San Francisco auckland new Bay Bridge in the United States were successfully completed on July 11, and officially passed the acceptance of relevant U.S. departments, all of which met their acceptance standards. This indicates that nearly 50000 tons of River steel "Wugang brand" quenched and tempered weather resistant bridge steel a709m-hps485w steel plate has been successfully used to manufacture the world's top bridges.San Francisco auckland new bay bridge is a key project implemented by San Francisco with an investment of US $7.2 billion. It was completed and opened to traffic in 2013. The bridge is the world's largest span single tower self anchored seismic suspension steel structure bridge. The single tower column with a self weight of 13000 tons supports the weight of 70000 tons of the whole bridge, ranking first among similar bridges in the world; The seismic design is grade 8, which is the most seismic design of bridges in the world; The bridge deck is 70 meters wide, which is the largest single tower bridge in the world; The daily traffic flow reaches 300000 vehicles, and the bridge capacity ranks first in the world. The industry said that the bridge is the most technically difficult and expensive steel bridge project among similar steel bridges in the world. After completion, it will become a landmark building on the west coast of the United States. In 2006, Zhenhua heavy industry, an important strategic cooperative customer of Hegang Wugang, stood out in the competition with companies from Japan, South Korea and Western European developed countries, and undertook the fabrication of nearly 50000 tons of steel structures of bridge steel towers and bridges of San Francisco auckland new bay bridge.In order to meet the requirements of earthquake resistance, tension and pressure resistance of the bridge, the science and Technology Department of Wuhan Iron and Steel Co., Ltd. of Hegang quickly formulated and issued the production process scheme of relevant steel types required. According to the requirements of the contract, the manufacturer strictly implemented the process standards to ensure that one furnace into one furnace and one piece into one piece. The quality inspection, acceptance, warehousing and shipment were closely coordinated to ensure the high-quality delivery of nearly 50000 tons of steel plates. The sales staff made every effort to provide pre-sales, in-sales and after-sales services to meet the engineering requirements of bridge steel tower and bridge steel structure manufacturing.He Gang Wu Gang weather resistant steel prop up The world's largest span corrugated steel web low tower cable-stayed bridgeOn August 23, 2019, Yuncheng (Shanxi Yuncheng) Bao (Henan Lingbao) Yellow River Bridge was completed and opened to traffic. Hegang Wugang has supplied more than 3000 tons of high-performance weather resistant bridge steel for the project. The bridge is the world's largest span low tower cable-stayed bridge with corrugated steel webs. It is the first large-scale highway bridge with bare weather resistant steel in China, and won the 13th "Gold Award for steel structure in China". As one of the suppliers of steel materials for the bridge, q345qdnh developed and produced by Hegang Wugang is used in key parts of the bridge, once again highlighting the unique charm of "the first board in China".The bridge is divided into three parts: approach bridge, main bridge and auxiliary bridge. The approach bridge adopts 4 × 40m prestressed T-beam, 110 + 2 for main bridge × 200 + 110m corrugated steel web central single cable plane low tower cable-stayed bridge, and 48 + 9 is adopted for auxiliary bridge × 90 + 48m corrugated steel web rigid frame continuous composite system beam bridge. The main span of the main bridge is 200 meters, making the bridge the largest corrugated steel web low tower cable-stayed bridge in the world. And the project has the characteristics of "new, long, deep and dangerous". The corrugated steel webs of the main and auxiliary bridges and the steel beams of the main bridge are all bare with q345qdnh weather resistant steel, which effectively reduces the later maintenance and operation cost and increases the durability of the overall structure of the bridge.In early 2016, during a visit to the market, the marketing team of Hegang Wugang learned that an equipment manufacturer in Wuhan wanted to purchase a batch of high-performance bridge steel for the yunbao Yellow River project. Due to the special construction site of the project, high requirements are put forward for bridge steel. In addition to withstanding the tests of strong wind and severe cold climate erosion, there are also special requirements for steel strength, toughness, weldability and corrosion resistance.Guided by the special steel road and strong special steel brand, WISCO quickly formed a marketing and technical team to deeply communicate with the equipment manufacturer and the owner, accurately grasp the special needs of customers and provide targeted technical services. Facing the additional requirements put forward by users in terms of steel plate surface quality, Hegang Wugang gives full play to its strong technical advantages and fully meets the special conditions of users. In view of the users' exceeding the conventional requirements in the strength, toughness, weldability and corrosion resistance of the steel plate, Wuhan Iron and Steel Co., Ltd. innovated the production process and customized the exclusive supply scheme for it. In addition to making every effort to do a good job in the technical intervention in the early stage of the project, it also successively organized to overcome a number of production process organization difficulties to meet the ordering needs of users. Finally, at the bidding meeting of the project supplier, with strong brand quality advantages and unique, professional, meticulous and thoughtful technical services, Hegang Wugang won the unanimous recognition of the equipment manufacturer and the owner, won the bid in one fell swoop, and fully demonstrated the strong brand strength of Hegang Wugang wide and thick steel plate. Since then, in the process of supply, Hegang Wugang supplied goods in time according to the contract requirements, which was highly praised by users.This batch of high-performance weather resistant bridge beam steel supplied by Hegang Wugang has been used without coating in yunbao Yellow River Bridge, which not only speeds up the construction progress, but also eliminates the later bridge anti-corrosion maintenance, which is highly praised by the construction party.exclusive supply of Hegang Wugang The longest weather resistant steel-concrete composite girder bridge in ChinaOn June 13, 2020, the longest weather resistant steel-concrete composite girder bridge in China - Jingyang River Bridge of Shaanxi Xizhen Expressway (Xixiang Zhenba) was successfully closed two months in advance. The 26000 tons of high-quality green and environment-friendly new material q345qdnh used in the bridge is developed by Hegang Wugang.Jingyang River Bridge of Xizhen expressway is 6.05 km long. For the first time in China, the bridge adopts the form of weather resistant steel-concrete composite beam bridge. The weather resistant steel made of q345qdnh is used. The steel can not only protect the steel matrix under the rust layer, but also greatly improve the atmospheric corrosion resistance by relying on the 50 μ m ~ 100 μ m thick dense and highly dependent protective film formed on its surface, The bearing capacity and service life are more than 10% higher than those of ordinary concrete bridges. In addition, due to the coating free process adopted by the whole bridge, the steel plate can be recycled after reaching the service life of 100 years, which will greatly reduce construction waste and truly realize green environmental protection and recycling.According to the personalized requirements of the project for materials in green and environmental protection, Wuhan Iron and Steel Co., Ltd. formed a "small and micro team of Jingyang River Super Bridge", carefully designed high-quality green and environmental protection materials for customers, formulated exclusive process schemes, and established an information communication channel integrating sales, technology, quality, production and shipment. In the production process, the small and micro team ensured the stability of the internal quality of the steel plate by accurately controlling the steelmaking composition; Many technological problems affecting the strength of steel plate in rolling and heat treatment have been solved successively, so that the atmospheric corrosion resistance, yield strength and tensile strength of steel plate all meet the upper limit requirements of national standards. With the full cooperation of the whole production line and functional departments, 26000 tons of high-quality weathering steel plates customized by Hegang Wugang for the project are delivered with high quality and high efficiency according to customer needs, laying the foundation for the smooth closure of Jingyang River Bridge two months in advance. Hegang Wugang high-end weather resistant bridge plate Set up Shaanxi Pingzhen Expressway to get rich roadUp to now, Hegang Wugang has supplied 6500 tons of high-end weather resistant bridge steel q345qdnh (bridge d) for Shaanxi Pingli Zhenping Expressway (hereinafter referred to as Pingzhen Expressway) located in the depths of Qinling Mountains.As the high-end weather resistant bridge steel used in the project has complex process, difficult production, high quality requirements and short construction period, as the project contractor, China Railway Baoqiao first issued an invitation to Hegang Wugang. China Railway Baoqiao has a strategic cooperation friendship with the company for more than 20 years. Among the 176 bridges under construction and completed and used on the Yangtze River in China, hundreds of high-end bridge steel of Hegang Wugang have been used, such as Wuhu Yangtze River Highway and railway dual-purpose bridge, Wuhan yingwuzhou Yangtze River Bridge, Shanghai Hutong Yangtze River Bridge, etc., which has become the glory of Hegang Wugang bridge steel. After fierce competition, Wuhan Iron and Steel Co., Ltd. won the bid for 3500 tons of weather resistant bridge steel q345qdnh (bridge d). Subsequently, the Ministry of science and technology, sales department, marketing department, production department, steelmaking system and rolling system attached great importance to unified coordination and formulated strict process standards to ensure the high-quality completion of the production task of 3500 tons of high-end weather resistant bridge steel. Due to excellent quality and timely delivery, since then, Hegang Wugang has successively received additional orders from customers.It is reported that Pingzhen expressway has a total length of 85 kilometers, four lanes, a total length of 32294 meters / 83 bridges, and a total investment of 11.529 billion yuan. The road is an important part of the national expressway project construction. It plays a very important role in strengthening the communication and cooperation between "Chengdu Chongqing Economic Zone" and "Yangtze River Economic Zone", promoting the circular economic development of Southern Shaanxi, improving the layout of regional road network and building an ecotourism corridor.weathering bridge beam steel of Hegang Wugang Support the world's first sea crossing high-speed railway bridgeOn the afternoon of September 15, 2020, with the completion of the last concrete pouring, the main tower on the South Bank of Quanzhou Bay sea crossing bridge of Fuzhou Xiamen high speed railway (the world's first large-scale sea crossing project using coating free weather resistant steel) was successfully capped, which marks that the world's first sea crossing high speed railway bridge with a design speed of 350 km / h has entered the construction fast lane as a whole. The 3000 ton Ni q345qdnhy-i marine environment resistant bridge steel plate developed by Hegang Wugang supports the key parts of the project. In view of the corrosion problem of important bridge structures in the marine environment, Quanzhou Bay sea crossing bridge of Fuzhou Xiamen high speed railway innovated and adopted new materials in the construction of cable tower steel anchor beam and support. For the first time in China, it adopted marine atmospheric corrosion-resistant steel without coating (without paint) and dehumidification system. It has become the first large-scale sea crossing project in the world to adopt coating free weather resistant steel, It is suitable for the marine corrosive atmospheric environment with high salt and humidity.1ni marine environment resistant bridge steel plate is recognized as one of the "green and environmental protection steels in the new century" by the industry. It is a landmark product reflecting the R & D competitiveness of steel enterprises. It is mainly used in bridges, engineering machinery, marine facilities and other fields. In addition to the characteristics of high toughness, high strength, fatigue resistance and lamellar tear resistance, it also has good weldability and easy processing, And resistance to marine environmental corrosion, the market prospect is broad.Wuhan Iron and Steel Co., Ltd. of Hegang has further promoted the re optimization of "two structures", relying on the advantages of the group's technology R & D platform and customer demand-oriented, focusing on creating high-quality products and leading the progress of the industry. According to the requirements of Quanzhou Bay sea crossing bridge project of Fuzhou Xiamen high speed railway, a research group was established to deeply connect with customers and provide customers with material solutions, which was recognized by customers. During the supply process, relying on the "four support systems", we innovated the smelting, rolling and heat treatment processes, broke through the industrial technical problems that the surface quality of steel is difficult to control under the design conditions of special composition of steel, realized the best matching of the surface quality of steel plate with high alloy content and corrosion resistance coefficient of marine climate, and successfully developed products with various performance indexes completely superior to the requirements of customers. Among them, the strength, low temperature toughness and marine atmospheric corrosion resistance of the products have reached the international leading level.At present, WISCO has supplied more than 130000 tons of high-quality weather resistant bridge steel to the market, which has made outstanding contributions to promoting the application of new steel materials and the development of national economy. At the same time, with the responsibility of developing more high-end bridge steel and serving the society, the bridge steel team of Hegang Wugang has successfully developed q500qenh and q690qenh in combination with national projects, making due contributions to the national promotion of high reinforcement, lightweight and green environmental protection of bridge steel.With the development of domestic railway steel bridges towards high-speed, heavy load, long-span and beautiful and novel structure, the market puts forward higher performance requirements for bridge steel. The production, marketing and research team of WISCO continues to adhere to the product R & D concept of "no one has me, no one has me, no one has me, no one is better than me, no one is better than me, no one is better than me, no one is better than me", give full play to the technical advantages, further strengthen the R & D management, constantly increase the R & D efforts of high-end new bridge steel, and lead the development of the industry. As the main participant, the project of "high performance bridge steel", the national key R & D plan of the 13th five year plan undertaken by Wuhan Iron and Steel Co., Ltd. of Hegang, has made phased progress, and continued to make efforts to achieve a major breakthrough in the field of domestic bridge steel technology. Release time：2021-09-26

Hoisting the steel cofferdam at the first section of Pier 2 of Changtai the pouring of the first 0 block on Hezhou Bank of Zhuhai Jinhai bridge is completed On the morning of November 27, the main bridge of Huanghu bridge, the longest Lake crossing bridge in Anhui Province, was successfully closed. The successful closure of the main bridge of Huanghu bridge lays a solid foundation for the opening of Huanghu bridge at the end of December 2021 as planned.At the construction site of Huanghu bridge, machinery roared, and the project builders were pouring concrete for the closure section of the main bridge. Huanghu bridge starts from xiacang town in the north and Huayang River Farm in the south, with a total length of 7.5km and a main bridge of 230m. Since this year, all the staff of the project have overcome the construction difficulties such as epidemic situation and rising water level in the inner lake, optimized the construction scheme and adopted various measures to ensure the smooth closure of the main bridge of Huanghu bridge in the early stage of ensuring safety and high quality.Huanghu bridge is the longest Lake crossing bridge in Anhui Province, and it is also an important link in the construction of wetland infrastructure of Huayang River and lake group. The construction of the bridge will be of great significance to promote the co construction of reclaimed land and the integration of farms into local economic development, and regulate the ecological environment and sustainable development of Huayang rivers and lakes. It is expected that after the completion of Huanghu bridge, the traffic between xiacang town and Huayang River farm will be shortened from the original 50 minute drive to 15 minutes.the steel cofferdam at the first section of Pier 2 of Changtai Yangtze River Bridge is hoisted in place On November 28, the steel cofferdam at the first section of Pier 2 of Changtai Yangtze River Bridge was successfully hoisted at the pier position, marking a new stage in the underwater foundation construction of Tianxingzhou special channel bridge of Changtai Yangtze River Bridge.In the morning of that day, at the bridge construction site, the hulls of two 600 ton and 800 ton floating cranes were fixed side by side, and the transport ship docked steadily at the downstream side of the drilling platform. With the command of the commander, the floating crane ship lifted the steel cofferdam and moved smoothly to move the behemoth accurately. It is understood that the cofferdam of Pier 2 is equivalent to the size of 3.7 standard basketball courts. It is hoisted in two sections. This time, the hoisting of the bottom section steel cofferdam is completed, with a height of 13.7m and a weight of 775 tons.Tianxingzhou special channel bridge, with a main span of 388m, is the largest highway railway steel truss arch bridge in the world. The construction of 1#-4# pier bearing platform adopts double wall steel cofferdam for protection construction. On the one hand, the steel cofferdam is used as the water retaining structure during the bearing platform construction, on the other hand, it is used as the formwork for concrete pouring of the bearing platform, and its section form is consistent with the plane layout of the bearing platform. The first section of the steel cofferdam was successfully hoisted in place, officially opening the prelude to the construction of the main tower pier bearing platform, and laying a good foundation for the next cofferdam heightening, main pier bottom sealing and bearing platform construction of Changtai Yangtze River Bridge. It is expected to complete the bottom sealing construction of four cofferdams by the end of February 2021 and the construction of four bearing platforms by the end of June 2021.the pouring of the first 0 block on Hezhou Bank of Zhuhai Jinhai bridge is completed On November 28, with the last truck of concrete pouring, the concrete pouring of block 0# of 75# pier on the left side of Hezhou Bank of Zhuji intercity Jinhai bridge was completed, marking that Hezhou bank has entered the superstructure construction stage.The Hezhou Bank of the bridge is located in the reclamation area (isolated island) of Hezhou island. There is no electricity or water, and there is no road to the construction area. The construction environment is very difficult. As the channel grade of Modaomen waterway is grade I, the trestle needs to reserve a channel, which cannot directly lead to Hezhou reclamation area from Hengqin. According to the construction organization design, 1.1km trestle and 13 underwater drilling platforms need to be built on Hezhou bank. The input of steel structure is about 15000 tons. All steel structure materials need to be transported to the construction location by ship from Hengqin bank.However, there are many construction piers at Hezhou side, and there are simultaneous construction of pile foundation, cofferdam, bearing platform, pier body, box girder, steel beam and other parts, involving a variety of processes carried out at the same time on adjacent working faces, which makes it difficult to manage the site.In addition, there are many bridge structures and large quantities within the construction scope, and the corresponding investment in personnel, materials, large machinery and equipment is huge. During the peak period of construction, there will be more than a dozen sets of hanging baskets working at high altitude at the same time, so the risk and difficulty of safety and quality management are high. The underground water in the bridge area has sulfate erosion and magnesium salt erosion, and the chemical environmental action level is high, The grade of salt crystallization damage and chlorine salt environmental action is high, and the bridge concrete adopts high-performance marine durability concrete. In the absence of hydropower, Hezhou bank only relied on generators to generate electricity in the early stage, and completed the construction tasks of 1.1km trestle and some drilling platforms. Through the unremitting efforts of the on-site workers, the problem of power and water consumption was solved by laying submarine cables and water pipes, which laid a solid foundation for the construction of the main structure of Hezhou bank.The total number of pile foundations on Hezhou bank is 323, of which 308 have been completed and the remaining 15; 51 cushion caps are designed and 32 have been completed; 51 pier shafts have been designed and 24 have been completed.Jinhai super major bridge is the first highway and railway dual-purpose bridge built at the estuary of the Pearl River Delta. The main bridge is a cantilever steel box girder multi tower rigid frame system highway and railway cable-stayed bridge on the same floor. The bridge is 1369m long and 49.6m wide. There is a double track 160km / h intercity Railway in the middle, and a six lane 100km / h Expressway on the left and right sides of the same floor.Gaolingtou water storage bridge of Jingwen Expressway enters the upper tower column construction stage At 7:30 on November 29, after 24 hours of continuous pouring, the second pouring of the lower cross beam of the z2# main pier of Gaolingtou water reservoir bridge of Jingwen Expressway Control Project was completed, marking the successful completion of the construction of the main tower 0# block. At present, the tallest concrete cable-stayed bridge in Zhejiang Province has entered the construction stage of the upper tower column.Gaolingtou water storage bridge is a tower pier beam consolidation system. The whole main beam 0# block includes the lower beam of the main tower and the π beam cantilever in the direction of large and small mileage. This construction 0# block is completed together with section 20 of the tower column. The lower beam of the main tower adopts a single box and single chamber section, and the top surface is a 2% two-way cross slope. The beam at the center of the box section is 6.28m high, 30.063m wide in the transverse direction and 6.0m wide along the bridge direction; The center of π beam is 2.98M high, the transverse width is 28.5m, and the length of unilateral cantilever is 5.5m.Through several demonstration and disclosure, the project team successfully put the high-altitude cantilever support of the lower beam into practice, solved the problem that the lower beam is high from the ground and can not be constructed with floor support, so that the cantilever π beams on both sides can be completed stably; According to the structural form of 0# block, concrete block, water bag, steel bar, section steel, etc. are used for support preloading to observe settlement and eliminate inelastic deformation. In formal pouring, the measurement department and a third-party monitoring unit are also used for joint monitoring and real-time observation; By optimizing the mix proportion of polypropylene fiber concrete, the fluidity state of concrete is the best, and the construction problems such as easy pipe blockage in high tower pumping of mass concrete are avoided.Considering the follow-up construction of the main bridge, the project department made a reasonable layout and planning for the embedded parts of the bridge deck construction in advance, including the reserved holes and thrust blocks of the hanging basket, the reserved holes and embedded steel plates of the winch, the embedded steel plates of the bridge deck elevator, the embedded steel plates of the inspection car track, etc., which provided convenience for the next process such as the removal of the main beam, elevator and lower beam support.The successful pouring of z2# main tower 0# block broke through the most difficult link in the construction of Gaolingtou water reservoir bridge, successfully completed the construction of section 20 of the main tower, opened the prelude to the construction of the upper tower column, provided a key platform for the construction of the upper tower column, and accumulated valuable experience for the subsequent main beam construction of z1# main tower. Release time：2021-09-26

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