China FAMOUS Steel Engineering Company Company News

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.

The steel structure is a structure 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. Beijing professional steel structure production and installation company is widely used in large factories, stadiums, super high-rises and other fields because of its light weight and simple construction. 1. Before the steel structure is installed, it is necessary to inspect various records and reports such as the factory certificate, the material test report, the non-destructive inspection report of the weld, and check whether the appearance of the component meets the design requirements, and the problem should be corrected immediately. 2. Drawing the steel structure installation flow chart and installing according to the flow chart. Before the installation, the accuracy of all anchor bolts should be checked, and the space position and design drawings should be corrected in time to ensure the anchor position. The accuracy. 3. The order of component installation should be carefully designed to form a rigid body as soon as possible so as to continue to maintain a stable state and to facilitate the elimination of errors in the installation of steel structures. 4. Component lifting should be carried out for necessary checking. For members with small lateral stiffness, measures should be taken to stop the distortion and damage. 5. During the installation of the column or steel structure, the beam and support should be installed in time, and if necessary, the cable rope should be temporarily fixed. 6. The installation of the steel column should pay attention to the influence of the temperature difference on the verticality of the component. The adjustment side quantity is based on the verticality of the standard column determined first, and the other columns are reviewed. 7. When the column is installed, the positioning axis of each column must be directly drawn from the control axis of the ground. The top axis of the next column should not be used as the positioning axis of the upper column. 8. Steel structure installation site welding environment, welding position, high-altitude operation, air temperature and humidity are unfavorable. Therefore, it is easy to produce weld defects, so measures must be taken to overcome the adverse effects. Unqualified weld rework No more than two times. 9. The torque wrench used for high-strength bolts must be calibrated before use. It should be calibrated after use. Once the calibration torque error is found to exceed the allowable range, the wrenches that are applied by the wrench are unqualified. The high-strength bolts shall be inspected after the final screwing, and the nuts may be tested one by one by a small hammer tapping method. The torque should also be tested 10. After the steel structure is installed and corrected, the gap between the column bottom plate and the top surface of the foundation should be grouted in time to make the bottom plate and the base surface tightly contact. 11. After the installation of the entire steel structure is completed, it shall be checked and accepted according to the requirements of “Code for Acceptance of Construction Quality of Steel Structure Engineering” (GB 50205-2001).

Due to the increase in steel production in China, more and more enterprises are beginning to use the steel structure design steel structure factory. The steel structure factory is divided into light steel structure workshop and heavy steel structure workshop. The main load-bearing components are composed of steel, including Steel pillars, steel beams, steel structure foundations, which are different from traditional brickwork buildings, have the following characteristics: 1. The steel used in the steel structure design workshop is plastically good. Under normal circumstances, the structure will not suddenly break due to accidental overload or partial overload. The toughness of the steel is good, so that the structure has strong adaptability to dynamic loads; 2. The steel used in the steel structure design workshop is uniform in material and high in structural reliability; 3. Steel structure design The steel used in the workshop has high strength, light weight structure and large span of manufacturing plant, which can be made into a structure with a large span; 4. The steel of the steel structure workshop has weldability, which greatly simplifies the connection of the steel structure and is suitable for manufacturing various complicated shapes; 5. High degree of industrialization in the manufacture and installation of steel structures The production of steel structures is mainly carried out in specialized metal structure factories, so the production is simple and the precision is high. The manufactured components are transported to the site for installation, with high assembly degree, fast installation speed and short construction period. Of course, the steel structure design factory also has other special features, such as heat resistance, non-refractory, and poor corrosion resistance, and should avoid the humid environment as much as possible. However, in general, the steel structure plant has high strength, large span, short construction period of steel structure construction, and correspondingly reduced investment cost, which is more and more welcomed by enterprise manufacturers.

According to the data of the General Administration of Customs on May 8, the export of steel products in China was 6.326 million tons in April 2019, a decrease of 0.1 million tons from the previous month, down 2.3% year-on-year. In the first four months, China exported 23.351 million tons of steel, an increase of 8.3%. . In April, China imported 1.0 million tons of steel, an increase of 101,000 tons from the previous month, down 4.3% year-on-year; in January-April, China's cumulative imports of steel was 3.896 million tons, down 13.4% year-on-year. In April, China imported 80.772 million tons of iron ore and its concentrates, a decrease of 5.752 million tons from the previous month, down 2.6% year-on-year; from January to April, China imported a total of 34.208 million tons of iron ore and concentrates, down 3.7% year-on-year. . In April, China exported 582,000 tons of coke, down 18,000 tons from the previous month, down 28.4% year-on-year. From January to April, China exported 2.585 million tons of coke, down 13.8% year-on-year.

Prestressed concrete box girder bridge with corrugated steel web, also known as corrugated steel web PC bridge, refers to box girder with corrugated steel plate instead of concrete web of prestressed concrete box girder as web. Its remarkable feature is 10~ A 20 mm thick steel plate replaces a concrete web having a thickness of 30 to 80 cm.   Origin In the 1980s, France first designed and built a new composite bridge-cognac bridge with corrugated steel webs instead of ordinary concrete box girder webs. Later, several Maupre viaducts, Asterix bridges and Dole corrugated steel were built. Web bridge.   Development Since the 1990s, Japan has also studied this type of bridge. Based on the similar bridges in France, it has built a series of bridges such as the New Bridge, the Bengu Bridge [1], and the Pine No. 7 Bridge. There are continuous beam bridges and continuous rigid frame bridges, which widen the scope of use of such bridges and develop design and construction techniques.   Domestic There are no real bridges for corrugated steel web prestressed concrete composite box girder. At the same time, several bridges of this type have been built in France/Germany, especially in Japan. Design and construction techniques are increasingly mature. Prestressed concrete composite box girder with corrugated steel web is especially suitable for continuous box girder with medium and large span. With the development and deepening of the analysis and research of this structure in China, as well as the reference to foreign engineering practice experience, the prestressed concrete composite box girder with corrugated steel web will be applied in the construction of bridges in China.

Bailey Bridge is a fast-assembled bridge designed by the Highway Planning and Design Institute of the Ministry of Communications on the basis of the original British-made Bailey Steel Truss Bridge. It is a decomposable and fast-erecting standard bridge. High-strength steel is fully welded. The main beam is a decomposable light truss. The truss is connected by a single pin. The components are interchangeable and light in weight. It is easy to transport and disassemble. It can also be assembled according to the requirements of span and load. The type of assembled steel bridge is a well-prepared and comprehensive emergency transportation support assembled steel bridge. Applicable to 5 kinds of loads such as automobile-10, automobile-15, automobile-20, crawler-50, and trailer-80.