China FAMOUS Steel Engineering Company Company News

At 8 o'clock on June 27, with the completion of the concrete pouring of the last party, the south main tower of the Hutong Yangtze River Bridge, which was constructed by the China Railway Corporation, the design of the China Railway Bridge and the construction of the China Railway Bridge Bureau, was successfully capped. So far, the two bridges are up to 330m. The main tower was completed.   The Hutong Yangtze River Rail-to-Use Railway Bridge has a total length of 11072m, a main bridge length of 2296m and a main span of 1092m. It is the largest spanned cable-stayed bridge in China and the world's first super-km-long cable-stayed bridge. The bridge is the control project of the entire line of Hutong Railway. It is also a “three-in-one” function of the national railway, intercity railway and expressway. It is designed as the upper layer for the Hutong Railway, Tongsujia Intercity Railway and Xitong Expressway. 6 lane highway, lower 4 lane railway. The steel used in the bridge project is about 480,000 tons, which is equivalent to the steel used in 12 "Bird's Nest"; the concrete is 2.3 million m3, which is equivalent to the use of 8 national grand theatres. The bridge is made of new materials such as Q500qE high-strength steel and 2000Mpa parallel steel wire stay cables. Its large scale of engineering, high construction difficulty, and a large number of scientific and technological innovations have created the world's bridges and many of China's bridge construction, representing the highest level of bridge construction in China and the world at present.

At 8 o'clock on June 27, with the completion of the concrete pouring of the last party, the south main tower of the Hutong Yangtze River Bridge, which was constructed by the China Railway Corporation, the design of the China Railway Bridge and the construction of the China Railway Bridge Bureau, was successfully capped. So far, the two bridges are up to 330m. The main tower was completed.   The Hutong Yangtze River Rail-to-Use Railway Bridge has a total length of 11072m, a main bridge length of 2296m and a main span of 1092m. It is the largest spanned cable-stayed bridge in China and the world's first super-km-long cable-stayed bridge. The bridge is the control project of the entire line of Hutong Railway. It is also a “three-in-one” function of the national railway, intercity railway and expressway. It is designed as the upper layer for the Hutong Railway, Tongsujia Intercity Railway and Xitong Expressway. 6 lane highway, lower 4 lane railway. The steel used in the bridge project is about 480,000 tons, which is equivalent to the steel used in 12 "Bird's Nest"; the concrete is 2.3 million m3, which is equivalent to the use of 8 national grand theatres. The bridge is made of new materials such as Q500qE high-strength steel and 2000Mpa parallel steel wire stay cables. Its large scale of engineering, high construction difficulty, and a large number of scientific and technological innovations have created the world's bridges and many of China's bridge construction, representing the highest level of bridge construction in China and the world at present.

According to the statistics of the National Bureau of Statistics, from January to May 2019, China's crude steel output was 404.88 million tons, an increase of 10.2% year-on-year. In the same period, steel output was 480.36 million tons, an increase of 11.2% year-on-year. The double-digit growth in crude steel and steel production has made the search for “steel demand” a problem that the steel industry has to face.   At the same time, the steel structure shows great potential for development. “In 2018, the output of steel structure was 0.6874 billion tons, the output of steel structure accounted for 7.4% of steel output, and the output increased by 11.84%; the output of overseas exported steel structure reached 1.117 million tons.” Recently, Deputy Secretary-General of China Construction Metal Structure Association The Construction Steel Structure Branch President’s Party Defence announced the development data of the construction steel structure industry last year to the whole industry at the National Steel Structure Construction Industry Conference.   The same double-digit increase indicates that the steel structure building is becoming a new force for “steel demand”.

On June 18th, the Apengjiang Bridge, the first high-span railway bridge in China, was successfully completed. The first high span means that the pier is 123.5 meters high and the main span is 240 meters. The long span of such a high pier is rare for domestic railways. The successful completion of the Apengjiang Bridge marked the completion of the work in front of the Zhangjiajie Changde Railway Station and won time for the entire line of timelines.

The modern economy is constantly improving and the construction of cities is not falling behind. With the booming of high-rise buildings and the height of building heights, more and more people are paying attention to steel structures because steel structures have high strength, light weight, good seismic performance, short construction period, low base cost and structural occupation. Many advantages such as small area and high degree of industrialization. However, compared with the concrete structure, a significant weakness of the steel structure is that it is easy to conduct heat. When the surface temperature of the steel reaches 400 °C, the strength and elastic modulus will decrease significantly. When the temperature reaches 600 °C, the strength of the steel for steel structure is almost Zero. The fire resistance of bare steel is usually only 15 to 30 minutes. According to the requirements of China's building fire protection design code, the main load-bearing components of the building, such as the fire resistance limit of columns, beams, walls and floors, are 0.5 to 3.0 hours respectively. Our country has clearly stated that it is necessary to adopt fire prevention measures on the steel structure, and it is necessary to meet the corresponding national standards before passing the acceptance.   The fire protection treatment methods of steel structures are various. In the past, solid concrete outer cladding layers by cast-in-place molding, fire barriers such as refractory bricks, gypsum board coating or internal cooling of hollow pipes were used. Now more is to protect the steel structure by spraying fireproof coating, anticorrosive coating and fluorocarbon paint. Because of the good fireproof and heat insulation performance of this measure, the construction is not restricted by the structural geometry, generally no need to add auxiliary facilities, and the coating quality is light, and there is a certain aesthetic decorative effect, so it has been widely used.   In addition, there are steel structure stairs, steel structure steel frame, light steel structure, steel structure stadium, steel structure shed, steel structure canopy, steel structure canopy, steel structure canopy, steel structure advertising facility, steel structure automobile exhibition hall, steel Structural light boxes, power plant steel structures, airport steel structures, etc.

A few days ago, the new transportation bridge project of Hangzhou Asian Games, the new bridge of Qiantang River, was officially started. It is expected to be completed before the opening of the Asian Games in 2022. As a key project of the Hangzhou section of the Shanghai-Hangzhou-Ningbo Expressway, the completion of the bridge is of great significance to promote the development of Zhejiang Dawan District, Metropolitan Area and Hangzhou City.   The new Qiantang River Bridge is located on the downstream side of the Pengyu Bridge. It has a total length of 1350.8 meters and is divided into two upper and lower floors. The upper level is the elevated expressway and the lower level is the double-line fast track. The airport track express line crosses the Qiantang River from here. After the completion of the bridge, it will further support the development strategy of Hangzhou's eastward expansion and support the river, and improve the internal traffic of the city; connecting Xiaoshan Airport, Qianjiang Century City, Qianjiang New City and East Station Hub will become an important commuter passage for Hangzhou citizens.   It is understood that the Hangzhou section of the Shanghai-Hangzhou-Ningbo Expressway has a total length of 23.6 kilometers. In addition to the main toll station, the entire line is in the form of a viaduct. The viaduct adopts the first-class highway construction standard, and the design speed is 80 km to 100 km. The ground road adopts the first-class highway construction standard and takes into consideration the urban road function, and the design speed is 60 km.

Last week, the Hangzhou Bay Cross-sea Railway Bridge (the Shanghai-Jialong Railway Hangzhou Bay Bridge) laid the first hole and the marine survey work was fully launched. On the same day, the No. 1 hole completed the installation and positioning of the equipment platform and began the drilling work.   In 2008, the Hangzhou Bay Bridge was completed and opened to traffic. The distance between Ningbo and Shanghai was shortened to more than 120 kilometers. However, this bridge is a highway bridge. It takes more than two hours to travel from Ningbo to Shanghai. However, when the Hangzhou Bay Cross-sea Railway Bridge, which has recently laid the first hole, will be built on the bridge, the high-speed rail will be built on the bridge. Therefore, the “1 hour traffic circle” between “Shanghai-Ningbo” will no longer be a dream.   It is reported that the Hangzhou Bay Cross-sea Railway Bridge with a total length of about 26 kilometers has been included in the overall scheme of the Tongsu Jiayu high-speed railway, and has become an integral part of the coastal railway passenger transport corridor in the main skeleton of the national high-speed railway network. According to the pre-feasibility review meeting of the Tongsu Jiayu Railway held in Beijing at the end of April this year, the north and south ends of the Hangzhou Bay Cross-sea Railway Bridge are Jiaxing Haiyan and Ningbo Cixi. Therefore, in the future, people can take the 350-kilometer high-speed train from Shanghai via Jiaxing to Ningbo, no longer detour to Hangzhou and Shaoxing.

On May 24, 2019, the “Steel Rebar Export Certification Training Seminar” was held in Nanjing. The meeting was jointly organized by China Iron and Steel Industry Association and British steel industry certification authority CARES. More than 70 representatives from steel companies and related technical service organizations attended the meeting.   The successful convening of this training meeting will help steel companies understand the new development trend of domestic and international construction steel industry and new demand for steel application, strengthen information sharing and cooperation, promote domestic steel enterprises to build international brands, and promote the global development of construction steel industry.

The installation of the Bailey beam must be discharged according to the design location. According to the spacing between the piers, the mid-span 50m box girder support frame length is 48m, which can be adopted according to the seven-span (8+2+11+2.5+11+2+8)m structure; the side span 35m beam support frame length is 29m, The span adopts a (10+2+8.5+2+8)m structure. The Bailey pieces are connected by a support frame, and are assembled by a crane after being assembled on the ground. When the Berea beam is installed, try to place the position of the Beray pole on the I-beam. Channel distribution beam construction A channel distribution beam is arranged on the top surface of the Bailey sheet longitudinal beam. The channel steel specification is [16a, the channel steel buckle is on the Bailey beam. According to the design spacing, the encryption section spacing is not more than 45cm, and the remaining 60cm. The lap joint of the distribution beam must be placed on the longitudinal beam to avoid the vertical pole arrangement of the suspended probe full bracket construction: the longitudinal spacing of the vertical pole is 60cm, and the spacing between the beam end and the middle beam is 40cm. The lateral spacing is 40 to 45 cm under the side web and the middle web, 60 cm in other parts, the longitudinal spacing of the lower vertical rails is 60 cm, the lateral spacing is 90 cm, and the bottom step is 20 cm. 1. The crossbar has a step distance of 120cm except for the top and bottom step distance of 20cm. The height of the bracket is adjusted by the top bracket. The rod is supported on the laid distribution beam by the lower support. The upper part of the rod is supported by the upper support bracket and the transverse shear support is arranged every 4 rows, and the top and bottom of the bracket are provided with horizontal scissors. The angle between the axis of the transverse scissors slanting rod and the horizontal line is generally 45°~60° to ensure the lateral stability of the bracket. All the scissors slanting rods must be set long. When the length of the single steel pipe is not enough, two fasteners are connected. The fasteners must be fastened and fastened to ensure reliable transmission. All vertical and horizontal bars that intersect the slant bar must be reliably connected to the slant bar. 2. The bottom mold of the box girder and the side mold construction bottom mold are directly laid on the square wood with 12mm thick bamboo rubber board, fixed with small iron nails, so that the bottom mold and the bottom of the box girder are exactly the same, and the axis and elevation are adjusted. Install the box girder side mold after meeting the requirements. The side stencils are installed sequentially from one end of the beam, requiring tight seams and flat joints between adjacent stencils. The side mold arc chamfering is cut by a 110mm diameter PVC pipe, installed according to the requirements of the drawings. The rest is made of wood mold, the back rib is 10cm square wood attached to the back of the plywood as the transverse rib, and the square wood support and the steel pipe oblique support are used for reinforcement. Arranged at a distance of 30 cm in the horizontal direction, so that the longitudinal formwork is sewn on a line to ensure the appearance quality of the box girder. The pre-pressing scheme of the bracket pre-pressing bracket is to check the strength and stability of the bracket and the foundation, eliminate the elastic deformation and inelastic deformation of the bracket, and measure the elastic deformation data of the bracket to set the pre-cavity of the cast-in-place beam template, and pre-stress the bracket. The preload load is 110% of the maximum load of the beam construction. 3. Accurate measurement during preloading can measure the elastic deformation value and foundation subsidence value of the bracket under the beam load, and the elastic deformation value, foundation sinking value and other reasons proposed in construction control The factor needs to be set to pre-cavity superposition, calculate the pre-camber degree that should be used during construction, and adjust the bottom mold elevation according to the calculated pre-camber. Measuring point layout? Measuring point layout principle: each of the two ends of the beam, 1/4 beam span, mid-span, 3/4 beam spans are set with 5 measuring points, a total of 65 measuring points.

In April, the national crude steel output was 85.03 million tons, up 12.7% year-on-year, and the growth rate was up 7.9 percentage points year-on-year; steel output was 102.05 million tons, up 11.5%, up by 3 percentage points. Coke production was 38.99 million tons, up 3.4%, down 3.6% in the same period last year. The output of ferroalloys was 2.59 million tons, an increase of 3.8%, down 0.3 percentage points. The export of steel products was 6.33 million tons, which was the same as that of the previous month; the import volume was 1 million tons, an increase of 100,000 tons from the previous month. The import of iron ore was 80.77 million tons, a decrease of 5.65 million tons from the previous month; the export of coke was 580,000 tons, a decrease of 20,000 tons from the previous month.   From January to April, the national crude steel output was 314.96 million tons, an increase of 10.1% year-on-year, and the growth rate increased by 5.1 percentage points year-on-year; the steel output was 370.86 million tons, an increase of 11.1%, an increase of 6.1 percentage points. Coke production was 15.84 million tons, an increase of 6.5%, a decrease of 3.5% in the same period last year. The output of ferroalloys was 10.27 million tons, an increase of 6%, down 2.3 percentage points. From January to April, steel exports reached 23.35 million tons, an increase of 8.3%; imports of 3.9 million tons, down 13.4%. Iron ore imports were 34.21 million tons, down 3.7%. The export of coke was 2.58 million tons, down 13.8%.   Steel prices have risen from last month. In April, the domestic market steel price composite index averaged 112.05 points, up 2.89 points from the previous month and up 0.66 points year-on-year. The average price of 8mm high line was 4262 yuan / ton, up 3.5% from the previous month and up 4.6% year-on-year; the average price of 20mm medium plate and 1.0mm cold rolled coil was 4129 yuan / ton and 4525 yuan / ton respectively, compared with last month. They rose by 2.5% and 1.3% respectively, down 3.1% and 2.5% respectively. Source: National Development and Reform Commission