China FAMOUS Steel Engineering Company Company News

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

It has ten advantages such as shock resistance, wind resistance, durability, heat preservation, sound insulation, health, comfort, speed and energy saving. Steel structure refers to a structure that can withstand and transmit loads by connecting steel plates and hot-rolled, cold-bent or welded profiles through joints. Sound insulation: The wall made up of light steel keel and thermal insulation gypsum board can have a sound insulation effect of up to 60 decibels. The sound insulation effect is an important indicator for evaluating the house. The windows installed in the light steel system are all made of insulating glass, which has good sound insulation and sound insulation of more than 40 decibels. Comfort: Adjustable indoor air dryness and humidity; the roof has ventilation function, which can form a flowing air between the interior of the house. The light steel wall adopts an efficient energy-saving system and has a breathing function to ensure the ventilation and heat dissipation requirements inside the roof. Wind resistance: The building's own weight is only one-fifth of the brick-concrete structure. It can withstand hurricanes of 70 meters per second, so that life and property can be effectively protected. The steel structure has light weight, high strength, good overall rigidity and strong deformation ability. Insulation: Use the insulation board of the outer wall to effectively avoid the "cold bridge" phenomenon of the wall and achieve better insulation effect. The thermal resistance of R15 insulation cotton with a thickness of about 100mm can be equivalent to a brick wall of 1m thick. The thermal insulation material used is mainly made of glass wool, which has good thermal insulation effect. Durability: Steel structure houses can effectively avoid the influence of corrosion of steel plates during construction and use. The light steel structure residential structures are all composed of cold-formed thin-walled steel component systems. The steel bones are made of super anti-corrosion high-strength cold-rolled galvanized sheets, which has been increased. The service life of light steel components. The structural life can reach 100 years. Environmental protection: Really green and pollution-free, materials can be recycled 100%. Health: All materials are green building materials, which meet the requirements of ecological environment and are conducive to health. Dry work construction, reduce the pollution caused by waste to the environment, the steel structure of the house can be 100% recycled, and other supporting materials can also be mostly recycled, in line with current environmental awareness. Fast: A building of about 300 square meters, only 5 workers and 30 working days can complete the whole process from foundation to decoration. All dry work in steel structure engineering is not affected by the environmental season. Energy-saving: heat preservation, heat insulation, sound insulation effect, all adopt high-efficiency energy-saving wall, which can reach 50% energy-saving standard. Seismic resistance: Light steel components form a very strong “rib rib structure system” after sealing structural sheets and gypsum boards. This structural system has stronger earthquake resistance and resistance to horizontal loads, and is suitable for seismic intensity. Areas above 8 degrees. Most of the low-rise villas are sloping roofs, so the roof structure basically uses a triangular roof truss system made of cold-formed steel members.

The choice of bridge guardrail form should first determine the anti-collision level according to the road grade, comprehensive consideration of its safety, coordination, characteristics of the object to be protected and site geometry, and then according to its structure, economy and construction and maintenance. Other factors make the choice of the form of construction. The embedding method includes three types: the column is directly embedded, the flange is connected, and the bridge guardrail and the bridge deck are cast into one body through the force transmission steel. When the conditions permit, the removable guardrail can be used.   There are many ways to divide the type of bridge guardrail. In addition to the position according to the set position, it can also be divided according to the structural features and anti-collision performance. According to the setting position, it can be divided into bridge side guardrail, bridge central divider with guardrail and pedestrian and lane boundary guardrail; according to structural features, it can be divided into beam-column (metal and concrete) guardrail, reinforced concrete wall type expansion and combined guardrail According to the anti-collision performance, it can be divided into rigid guardrail, semi-rigid guardrail and flexible guardrail. Commonly used guardrails are concrete guardrails, corrugated beam guardrails and cable guardrails.

Steel structure is a structure mainly composed of steel materials and is one of the main types of building structures. The structure is mainly composed of steel beams, steel columns, steel trusses and other components made of steel and steel plates, and the joints, bolts or rivets are usually connected between the components or components. Because of its light weight and simple construction, it is widely used in large factories, stadiums, super high-rises and other fields.   The steel is characterized by high strength, light weight, good overall rigidity and strong deformability. Therefore, it is especially suitable for building large-span and super-high and super-heavy buildings. The material is homogeneous and isotropic, and it is an ideal elastomer. It is most in line with the basic assumptions of general engineering mechanics; the material has good plasticity and toughness, can have large deformation, can withstand dynamic load well; construction period is short; its industrialization degree is high, and it can carry out specialized production with high degree of mechanization. Steel structures should be studied for high-strength steels, which greatly increase the strength of the yield point; in addition, new types of steels, such as H-beams (also known as wide-flange steels) and T-shaped steels and profiled steel sheets, are required to accommodate large-span structures and The need for super high-rise buildings.   In addition, there is no thermal bridge light steel structure system, the building itself is not energy-saving. This technology solves the problem of cold and hot bridge of the building with clever special joints; the small truss structure allows the cable and the upper and lower water pipes to pass through the wall, construction The decoration is convenient.   When the steel structure is also damaged, we need to find out the immediate solution to the problem. The main factors that describe the damage of the steel structure in the steel structure network are: 1) due to load changes, overtime service, changes in specifications and procedures, resulting in insufficient structural bearing capacity; 2) components Deformation, distortion, disability, depression, etc. due to various accidents, resulting in weakened section of the member, warpage of the member, joint cracking, etc.; 3) deformation or cracking of the member or joint under temperature difference; 4) due to chemical substances Corrosion caused by corrosion and electrochemical corrosion caused the structural section of steel structural members to weaken; 5) Others include design, production, construction errors and violations of use and operation during service. There are three main technical measures for reinforcement of steel structures: 1) Reinforcement method: Reinforce steel in part or along the length of the member, and join them together to force them together; 2) Change the calculation diagram: add additional support, adjust Load distribution, reduce the internal force level, forcibly shift the statically indeterminate structure support, reduce the stress peak; 3) Prestressed cable method: use high-strength cable to strengthen the structural weak link or improve the overall bearing capacity, stiffness and stability of the structure .

According to the National Bureau of Statistics, in March 2019, the national pig iron output was 69.83 million tons, an increase of 10.1% year-on-year. The output from January to April was 262.65 million tons, a year-on-year increase of 9.6%.   In March 2019, the national crude steel output was 85.03 million tons, a year-on-year increase of 12.7%. The output from January to April was 314.96 million tons, an increase of 10.1% year-on-year.   In March 2019, the national steel output was 102.05 million tons, an increase of 11.5% year-on-year. The output from January to April was 370.86 million tons, an increase of 11.1% year-on-year.   In March 2019, the national coke output was 38.99 million tons, a year-on-year increase of 3.4%. The output from January to April was 151.8 million tons, a year-on-year increase of 6.5%.   　 April January to April   Output Year-on-year growth％ Output Year-on-year growth％     Pig iron(10,000 tons) 6983 10.1 26265 9.6   Crude steel (10,000 tons) 8503 12.7 31496 10.1   Steel (10,000tons) 10205 11.5 37086 11.1   Coke (10,000tons) 3899 3.4 15184 6.5      

Bailey panels can be used for highway bridges, assembling gantry cranes, guide beams, bridge erecting machines, hanging baskets, etc. Bailey truss combined gantry cranes, assembled gantry frames with assembled highway steel bridge members, and their span and column height can be adjusted to adapt to different work sites, widely used in road, railway, municipal, construction, water conservancy and other construction projects, bridge construction prefabrication yards, lifting and transporting prefabricated components, bridge piers and transporting girders and other on-site construction operations. The Bailey panel is welded by the upper and lower chords, the vertical rod and the diagonal rod. The upper and lower chords have male and female joints at the ends, and the truss joint pin holes are arranged on the joints. The chord of the Bailey piece is composed of two No. 10 channel steels (back to back). On the lower chord, there are several steel panles with round holes, and there are reinforcing chords and double trusses in the upper and lower chords. The bolt holes are connected, and there are four bolt holes for connecting the support frame in the upper chord. The two holes in the middle are used for connecting the double or multi-row trusses with the same joint. 1. The two holes at the ends are for inter-section connection. When multiple rows of belays are used as beams or columns, the joints of the upper and lower Bailey panels must be reinforced with a support frame. On the lower chord, there are four beam plates with a tenon on top to fix the position of the beam on the plane. There are two elliptical holes on the channel steel web at the end of the lower chord for connection. Use against wind levers. The Bailey panel vertical rods are made of 8# I-beam, and a square hole is opened on the side of the lower chord of the vertical rod, which is used for fixing the beam by the beam fixture. The material of the Bailey panel is 16Mn, and each piece weighs 270kg. The "321" steel bridge is a prefabricated highway steel bridge. Its biggest feature is: the components are light, easy to disassemble and assemble, and adapt to five kinds of loads such as the car -20, the crawler-50, and the trailer-80. The bridge deck has a clear width of 3.7m and can be combined into a variety of span-span simple bridges in the range of 9m to 63m. The parameters of Bailey beam are imported and domestically produced. The domestic Bailey beam is made of 16 manganese steel, the pin is made of chrome-manganese-titanium steel, the bolt is made of spring steel, the welding rod is T505X type, the bridge deck and the guard wheel are made of pine. Or fir. 2. The allowable stress of the material is increased by 30% according to the basic stress. When the individual steel rod exceeds the above requirements, it shall not exceed 85% of the yield point. The allowable stress used in the design is as follows: wood material - the bending stress and pressure of the wood grain The stress and bearing stress are 16.2 MPa; the shear stress of the wood grain when bending is 2.7 MPa. The modulus of elasticity E = 98.5 x 105 MPa. The tensile stress, compressive stress and bending stress of the steel material—16 manganese steel is 1.3×210=273 MPa; the shear stress is 1.3×160=208 MPa. 3.30 Cr, Mn and Ti tensile stress, compressive stress and bending stress are 0.85×1300=1105MPa; shear stress is 0.45×1300=585MPa. The existing imported Bailey beam is a product of the 1940s. The yield point strength of the material is 351 MPa, and the allowable stress is considered to be 0.7×351=245 MPa. The allowable stress of the pin can be considered as the domestic pin. In this case, the strength is increased by 33% and the stiffness is increased by 2.3 times. Scope of application Single-lane bridge deck net width 4.2M, combined span 9.14-76.2M, double-lane bridge deck net width 7.4M, combined span 9.14-57.91M.