1. The positioning axis and supporting surface elevation of the foundation are out of tolerance:
The positioning axis of the foundation and the elevation of the supporting steel cylinder exceed the allowable deviation.
The reasons are as follows:
There are errors and deviations in foundation survey control network, foundation survey setting out and elevation finding.
The foundation formwork is not firmly set up, the pouring concrete blanking is too high, and the concrete is vibrated and impacted, which makes the formwork displacement and causes the datum line deviation.
Or the use of steel ruler, theodolite, level without calibration, there are errors.
Or construction wrong drawings, axis wrong, without strict inspection.
Or if the foundation bearing surface is not plastered and leveled twice, the concrete will shrink and sink.
Or the embedded steel plate (or support) is not fixed.
Because the foundation positioning axis and bearing surface are out of tolerance, the column installation axis and bearing elevation will be out of tolerance, which will affect the quality of the whole structural steel construction installation project.
(1) The accuracy of basic survey control network, instruments and measuring tools used for basic survey setting out and leveling shall be accurate. Before use, they must be checked or verified by the measurement department. If problems are found, they shall be adjusted in time to prevent errors or accumulated errors, resulting in axis and elevation exceeding the allowable deviation.
(2) The foundation formwork for steel structure construction must be firmly supported with sufficient strength and rigidity. When pouring concrete, cutting and vibrating, it is necessary to prevent from striking the formwork and causing displacement. In the process of concrete pouring, the positioning axis and elevation shall be checked regularly with measuring tools or suspension lines. If any deviation is found, the pouring and vibration shall be stopped, and the work shall be carried out after reinforcement and adjustment. Before the final setting of concrete, the surface of foundation concrete shall be plastered and leveled twice. For the embedded steel plate or bearing, the elevation and levelness shall be aligned twice, and the concrete at the bottom shall be dense. The steel plate or support of foundation support column shall be provided with necessary fixing devices to ensure correct position and elevation.
(3) When the elevation and levelness of the steel plate or support on the vertical and horizontal axis of the foundation and column bearing surface are out of tolerance, measures shall be taken according to the degree of deviation. When the out of tolerance is not serious, it can be solved by shifting the column base, reaming and packing the base plate. If the deviation is serious and cannot be adjusted, it should be studied with relevant departments to work out a feasible correction scheme before treatment.
2. Foundation anchor bolt thread damage:
The foundation anchor bolt thread is damaged, and the nut cannot be screwed and tightened during the column installation.
The causes of bolt thread damage are as follows:
Anchor bolts are impacted or improperly kept during transportation, loading and unpacking, resulting in serious thread corrosion.
Or the bolts were not protected after burying and were damaged by outside.
Or the bolt is used as electric welding zero line on site, and the thread is damaged due to arc burn.
Or the bolt is used as the binding point of the pulling force of the traction rope.
Due to the damage of bolt thread, it is impossible to screw in nuts to fasten steel columns and other components, which affects the transmission and stability of structural force.
(1) When the anchor bolts are transported, packed and unpacked, the thread protection shall be strengthened. After being smeared with industrial vaseline oil, they shall be wrapped and bound with plastic film to prevent thread damage and corrosion. And should be stored separately, should not be mixed with other parts and components, so as to avoid mutual impact damage thread.
(2) After the anchor bolt is embedded, it shall not be used as the fulcrum of bending processing, the neutral line of electric welding machine, or the binding point of traction force. When lifting components, proper operation shall be carried out to prevent the thread from being damaged by horizontal lateral impact force.
(3) The screw thread of the bolt has been damaged, and the following treatment methods can be adopted: when the damaged length of the screw thread does not exceed its effective length, the steel file can be used to trim the screw thread, so as to smoothly screw in the nut. When the length of thread damage of local foot bolt exceeds the specified effective length, the length of original thread section can be cut by gas cutting; Then, with the same material and specification as the original bolt, one end of the bolt is processed into thread, and the butt end section is made into 30º-- 45º. After butt welding with the lower end of the groove, the corresponding diameter specification and length of the steel casing sleeve into the joint, welding reinforcement. After casing reinforcement for steel work in construction, the diameter of the bolt will be larger than that of the base plate, which can be solved by appropriately enlarging the diameter of the base plate.
3. The setting of mortar base plate of column base does not meet the requirements:
The mortar base plate of column base is set randomly, and the elevation, levelness and position do not meet the design and specification requirements.
The reasons are as follows:
The surface of the foundation is not treated and leveled, so that the base plate can not bear the force smoothly, and the surface is uneven and uneven;
The base plate is not reasonably arranged according to the stress requirements, so that the base, base plate and foundation can not bear uniform pressure, so that the settlement of base slurry is uneven, and the elevation and levelness can not meet the requirements.
If the setting of open base plate does not meet the requirements, it can not transfer the load evenly, which will reduce the mechanical performance of the column and affect the stability of the superstructure.
(1) In order to make the base plate group transmit the force to the foundation smoothly, the base plate should be closely combined with the base slurry on the foundation surface. The uneven foundation surface shall be chiseled and leveled.
(2) The location and distribution of the base plate should be correct. Generally, according to the stress area of the steel column base plate, the base plate, the base plate and the foundation should be arranged in the center of the steel plate and the stress concentration position on both sides or near the two sides of the anchor bolt, so that the base plate, the base plate and the foundation can fully bear the pressure load, and bear the force uniformly together to avoid partial bias Concentrated stress or deformation of the base plate occurs when the anchor bolts are tightened.
(3) The area of the base plate directly bearing the load should meet the needs of the stress, which should be determined by calculation, and the area should not be too large or too small. Too large will cause waste, too small will cause local concentrated overload of foundation and affect the overall and uniform stress of foundation. The thickness of the base plate is generally within the range of 4 ~ 25 mm, each group is no more than 3 pieces. The base plate has a 10 ~ 12 mm thick steel plate, the length of the base plate is 100 ~ 300 mm, and the width is 50 ~ 120 mm. When setting the mortar, use non shrinkage cement mortar with strength not lower than 30MPa. As the steel column is mainly installed with cushion plate to adjust the elevation and levelness, the elevation and levelness shall be found when grouting, and the allowable deviation shall comply with the specification, and the supervision shall be strengthened. Before the base plate is grouted, the rust, oil stain and burr on the surface of the base plate shall be cleaned, so that the base plate can be firmly combined with the concrete when grouted and grouted; The length of the base plate group exposed to the outside of the base plate edge is about 10 ~ 20 mm.
4. Before the installation of steel column, the foundation is directly installed without inspection:
Before the installation of steel column, the axis and elevation of the foundation, the position and elevation of the anchor bolt and the concrete quality of the foundation are not checked in advance, so the installation is carried out directly. In this way, there may be out of tolerance without repair, which will cause structural installation difficulties, increase the steel column installation stress and affect the installation accuracy, and even cause quality hazards.
Before the installation of steel column, the positioning control line, foundation axis, elevation, anchor bolt position, elevation and concrete quality of foundation shall be pre checked. If the deviation is found, measures shall be taken to correct and adjust to the allowable deviation range of the specification. For elevation inspection, the measured data shall be compared with the pre inspection data of steel column size and elevation, and the error of the two shall be eliminated when the support base slurry pad or anchor bolt nut is adjusted. The allowable deviation of foundation support surface, anchor bolt position and base slurry pad shall meet the requirements of the specification. The quality of foundation concrete shall be dealt with in accordance with relevant regulations.
5. Don't check the dimension of steel members, deal with deformation and quality defects before installation
Before the installation of the structure, the external dimensions of the steel members are not checked, and the deformation and quality defects of the members are handled.
Although the steel components have passed the quality inspection before they are processed in the factory, they may fail to be inspected, or new deformation and damage may occur in the transportation and stacking of the components. If the review is not carried out before the installation, these problems can not be dealt with in time before the installation, which will affect the installation quality of the steel structure and cause installation difficulties or permanent quality defects.
Before the installation of steel members, the steel members shall be carefully checked in advance:
It includes checking the model and quantity of the component, the overall dimension of the component, the relevant dimensions between the supporting surfaces and the installation holes, and marking the datum line of the axis of the component. Check whether the component is deformed, and correct and repair the deformation error if there is any.
Whether the connecting plate, splint and other accessories of the component are complete and whether the position and size are accurate. Inspect whether the surface quality of the welding area of the component and the friction surface of the high-strength bolt connection meet the requirements and whether it is polluted.
Whether the member nodes are complete and whether the center of gravity of main components is marked.
Whether the surface of the component is polluted, whether the paint falls off, etc.
Pre inspection records of components shall be made; For the components with deformation and defects exceeding the allowable deviation, they shall be corrected and repaired on the ground before installation, and can be installed after they are qualified.
6. The perpendicularity of steel column installation is out of tolerance:
The verticality deviation of steel column exceeds the allowable value in design or code
When the steel column is manufactured, the deformation control measures are not taken or the bending deformation is not straightened.
Or the length of the column is large, the rigidity is poor, and the elastic or plastic deformation occurs under the action of external force.
Or due to the unreasonable hoisting technology and procedure, the roof panel is bent and deformed under the action of temperature, wind and external force.
Or there is deviation in the span size of the roof truss, the external force is used to force the connection during the installation, resulting in the over deviation of the verticality of the steel column.
This will lead to the deflection of the steel column and affect the bearing capacity and stability.
(1) Anti deformation measures shall be taken for assembly and welding of steel column, and the deformation during fabrication shall be corrected in time. When transporting and stacking steel columns, the supporting points should be appropriate to prevent bending deformation under the action of self weight. The out of plane stiffness of long column is poor, so the lifting point should be selected at 2 / 3 of the total length of the column to prevent deformation. If the span size of steel roof truss exceeds the deviation, it should be corrected before installation to prevent forced connection and bending deformation of column body.
(2) When the steel column is hoisted to the foundation plane in place, the vertical and horizontal axis above the column base plate should be aligned with the foundation line, so as to prevent the deviation of span size, which will lead to the horizontal tension or thrust when the column head is installed and connected with the roof truss, so as to make the column body bending and deformation, and carry out appropriate control.
(3) When the roof slab is hoisted after the connection and installation of the steel column and the tail-stock, it should be carried out symmetrically and synchronously from the edge of the two slopes in the center of the top chord to the middle, so as to prevent the bending deformation of the steel column caused by the lateral concentrated pressure generated by the one slope. Without the permission of the design, the steel column and other connected components shall not be used for horizontal dragging or vertical hoisting of heavy components and equipment, and the column bending deformation or damage to the connecting structure shall be prevented.
(4) If the bending steel column is elastic deformation, it can be restored to its original state after the external pressure is removed; If it is plastic deformation, it can be corrected by adding temporary support above or at the top of the bending part of the steel column before correction, so as to reduce the load-bearing gravity, and then fixing one side reaction frame at the bending part, and using jack for correction. If the rigidity of the steel column is large, it can be corrected by heating the bending convex surface with oxyacetylene flame, and then applying jacking force.
7. Steel column installation height is out of tolerance：
Height dimension or relative position of steel column after installation (±) The elevation dimension is out of tolerance, which makes the difference between the total height of each column and the height deviation of the bracket.
The reasons are as follows
Foundation elevation is incorrect or deviation occurs.
The length and dimension of steel column during the production stage are out of tolerance.
Or when the foundation elevation is adjusted and treated during installation, it is not combined with the actual length (height) of steel column, which will cause the positive or negative difference of the height dimension or elevation dimension of the steel column after installation.
Because of the over tolerance, it is difficult to install and adjust the components connected with it, which makes it difficult to correct and takes time.
(1) During the foundation construction, the elevation size should be strictly controlled to ensure the accuracy of elevation. The elevation dimension of the upper surface of the foundation shall be adjusted according to the actual length of the steel column or the elevation dimension of the bracket supporting surface, so as to make it consistent with the height and elevation dimension of the steel column after installation.
(2) During the manufacturing process of steel column, the length and size (including the total length and the length of each position specified in the design, the length and size within the allowable positive and negative deviation range, and the positive excess value not allowed) and the correct size of the total length and bracket of the steel column without contact point shall be strictly controlled. The latter can be adopted to weld the column body first, and the column base plate and column head plate shall not be welded temporarily, In case of out of tolerance, adjust before welding the base plate or upper column head plate of the column, and finally weld the base plate and column head plate of the column.
The full name of MDC is"MONDU DA CASA (home world)", which is constructed by Qingdao Xinguang Zheng Steel Structure Co., Ltd. This is a comprehensive shopping center centering on the theme of "happy home". This theme is the same as the enterprise mission of "benefiting the society, achieving employees and making customers happier". In addition to "home world", she has another interpretation of "modern decoration Center".
MDC is located in KIKUXI section of Luanda expressway, surrounded by Angola national stadium, high-end residential villa area, Brazil nursery garden, and Luanda commercial pedestrian street under planning, with superior geographical environment and convenient transportation.
"MDC home world" shopping center covers an area of about 30000 square meters. Relying on the global procurement network, it has gathered kipor generator 4S shop, furniture store, building materials store, home furnishing store and home appliance store. The categories include building materials pipe fittings, wood, floor tiles, paint and coating, decorative lamps, kitchen and bathroom equipment, hardware tools, electrical and electrical materials, gardening supplies, cloth furniture, home appliances, etc., and also auxiliary It is one of the most comprehensive "one-stop purchasing" centers for home furnishings in Luanda with public service facilities such as business office, catering, leisure and entertainment, bank, etc.
The light steel structure of commercial steel building is a structure composed of steel materials, and each component or part is connected by welding, bolts or rivets.
commercial steel building is mainly used for low-rise or multi-storey buildings: the prefabricated wall panels are transported to the construction site by special vehicles, hoisted by cranes, connected with the foundation by anchor bolts and connectors, and the wall panels are connected by screws and connectors, and then the light steel floor is installed. The light steel floor is composed of floor beams, profiled steel plates Steel wire mesh and concrete. The construction of the main structure can be completed by constructing the upper floor according to the construction method of one floor and finally installing the roof. The system is applicable to buildings with 6 floors and below. It has the advantages of high assembly rate, short construction cycle, earthquake resistance and typhoon resistance, thermal insulation, large use area in the sleeve, no exposed beams and columns, and recyclable materials.
1. The construction period is short. The construction period of commercial steel building can be shortened by more than 50%;
2. The project quality is stable. The quality of parts and components produced in commercial steel building factory is more stable, which solves many common quality problems of on-site construction technology and human errors in on-site construction, and ensures the project quality;
3. Energy saving and environmental protection, less construction pollution. commercial steel building adopts energy-saving technology, which greatly improves the performance of house thermal insulation and sound insulation, and improves the living comfort of the building. According to statistics, the prefabricated construction method can save about 50% water, 70% wood and 70% construction waste;
4. Integrated decoration, which is carried out simultaneously with architecture, structure and electromechanical design. commercial steel building completes the pre functional conditions, pipeline installation, wall decoration and component installation in place at one time, which not only ensures the decoration quality, but also avoids the repeated waste and secondary pollution of secondary decoration.
The construction quality problems of commercial steel building will continue to evolve and change with external changes and the extension of time, and quality defects will gradually manifest. For example, the welds of steel components cause cracks in the welds that did not originally have cracks due to changes in stress: delayed cracks can occur due to the activity of hydrogen in the welds after welding. In addition, if the component is subjected to long-term overload, the steel component will be bent and deformed under the arch, which will cause hidden dangers.
When faced with the relatively unfamiliar construction and construction techniques of steel structures, managers and technicians engaged in construction must be very careful and trained before they can take up their posts.
Knowing this, do you also want to order a commercial steel building? Qingdao Xinguangzheng Steel Structure Co., Ltd., which has been a Chinese pioneer in commercial steel building for many years. Their skilled staff can use the best solution for anything, particularly when a custom product is required.
Introduction of Product:
Steel structure building has a history of several decades in Europe and the United States. It develops rapidly with the
advantages of good seismic resistance, environmental protection and rapid installation. After more than 20 years of
steady development, xinguangzheng steel structure has continuously improved the "turnkey" ability of steel structure
product project from design, construction to decoration completion, providing systematic solutions for enterprises.
Take xinguangzheng apartment building as an example to show the new face of industrial enterprise apartment building.
Xinguangzheng steel structure apartment building
Project structure system:Steel structure light steel structure
Project area:270 square meters
Project detail: The whole apartment building has 5 floors, from the foundation to the external wall insulation, including water and
electricity system and decoration, are all completed by xinguangzheng steel structure, and equipped with independent
energy-saving central air conditioning.
One is the staff dining room, the other is cement foam board for maintenance. The two - five story is the employee dormitory, the
two outer wall maintenance material is the cement foam board, and the three to five layers of external wall maintenance material
is composite board. There are 4 suites on each floor. The bathroom and toilet of each room are independent rooms. The specific
configuration is 2 rooms, 1 kitchen, 1 hall,1 bath and 1 toilet.
Industrial steel building is easy to move and recycle without pollution. These are stronger than traditional workshops, and the walls of the steel structure workshops can also be filled with bricks, which are completely load-bearing. All future plant constructions will be steel structure plants. Here we are going to introduce the steps of installing Industrial steel building.
What are the raw materials used in industrial steel building?
What is the main installation process of industrial steel building?
What is the production and installation process of industrial steel building?
In addition to iron and carbon, the raw materials of industrial steel building also contain other elements. Divided into permanent elements; occasional elements; hidden elements and alloying elements. The common elements are manganese, silicon, sulfur, and phosphorus. Incidental elements are due to the different origins of ore (there are intergrowth ore mixed with iron) and scrap steel as raw materials, such as copper, titanium, vanadium, rare earth elements, etc., are brought into steel during smelting and process operations. The cryptic elements refer to non-metal elements with a small atomic radius, such as oxygen and hydrogen. Alloying elements refer to elements specially added to change the composition, such as chromium, nickel, tungsten, molybdenum, vanadium, etc.
Carbon steel (referred to as carbon steel) is an iron-carbon alloy with a carbon content of more than 0.0218% and less than 2.11%. Because carbon steel has good mechanical properties and process properties, and is large in output and low in price, it is a metal material that is widely used in mechanical engineering. However, carbon steel also has some shortcomings, such as low hardening energy, poor temper softening resistance, and low yield ratio. The strength potential of carbon steel cannot be fully utilized even after heat treatment. In order to meet the continuous development of modern industry and science and technology, alloy steel was developed.
Foundation → production and installation foundation is divided into (foundation ground survey → foundation excavation → embedded screws → foundation casting → later foundation grouting → outdoor water dispersion → outdoor drainage ditch (some factory design indoor drainage ditch or cable ditch suggestion Completed simultaneously with installation)→Enclosure masonry→tiling tiles, etc.)
The production and installation are divided into (processing production→component painting→structural pre-assembly→steel component hoisting→main structure adjustment→purlin installation→door and window column installation→gutter downpipe installation→steel component painting (some are fireproof, some are Anti-corrosion, according to design requirements) → roof panel (some with steel mesh, some with insulation layer, completed at the same time) → wall panel installation → door and window installation → water supply and drainage installation → electrical equipment installation)
Qingdao Xinguangzheng Steel Structure Co., Ltd., as a Chinese pioneer in producing Industrial steel buildings, can ensure the products’ quality and the after-sales service.
Industrial steel building mainly means that the main load-bearing components are composed of steel. Including steel pillars, steel beams, steel structure foundations, steel roof trusses (of course, the span of the factory building is relatively large, and it is basically steel structure roof trusses now), steel roof, note that steel structure walls can also be surrounded by brick walls.
What are the characteristics of Industrial steel building?
What are the industrial characteristics of Industrial steel building?
Why do we have to carry out daily maintenance on Industrial steel buildings?
The characteristics of the steel construction workshop are:
1. Industrial steel building is light, high-strength and has a large span width.
2.The construction time of industrial steelworks is short, reducing investment costs accordingly.
3. Industrial steel buildings have poor fire resistance and corrosion resistance and steel structures should not be used in areas with low temperatures.
4. Industrial steel building is easy to move and recycle without contamination.
The roofs of flat buildings are mostly inclined roofs, so that the roof construction essentially uses a triangular roof chair system made of cold-formed steel components. The light steel components form a very strong structure after sealing the building plates and plasterboard plates. "Plate-rib structural system", the industrial steel structure of this structure has a stronger earthquake resistance and resistance to horizontal loads and is suitable for areas with earthquake intensities above 8-degree.
The Industrial steel building has a low weight, a high strength, a good overall stiffness and a strong deformability. The building weighs only a fifth of the brick concrete construction and holds a hurricane of 70 meters per second so that life and property can be effectively protected.
The housing structure of the Industrial steel building consists entirely of cold-formed thin-walled steel component systems. The steel frame consists of a high-strength, cold-rolled, fire-soaked super-corrosion protection sheet which effectively avoids the influence of steel sheet corrosion during construction and use and increases the durability of light steel components. The durability of the structure can reach 100 years.
Industrial steel buildings must be regularly cleaned and maintained. Under normal circumstances, it must be inspected and maintained once a year. When cleaning the outer wall of the Industrial steel building, you must be careful not to contaminate anything. Do not use steel wire balls, brushes and other abrasive cleaning agents. If you use clean water, you should rinse from top to bottom. The branches, leaves and similar objects on the Industrial steel building should be cleaned in time to avoid unnecessary problems due to the delay. If the surface of the metal plate for industrial steelmaking is damaged, it should be repaired in time to prevent the surface of the metal plate from corroding by sun and rain. If necessary, use all coated high-elastic nanomaterials to protect the metal roof plate, act effectively in thermal insulation and sealing and save energy for room climate.
Seeing this, do you also want to order a Industrial steel building? If necessary, you can contact Qingdao Xinguangzheng Steel Structure Co., Ltd. they will provide the Industrial steel building of the best quality.
Steel building accessories include steel components such as steel wall trusses, steel trusses, steel windshields, steel roof trusses, steel beams, steel columns, steel supports, etc.; specific requirements are corresponding to the quota sub-items, which are calculated separately, and different sub-items are set.
What are the advantages of using Steel building accessories to build houses?
What are the common Steel building accessories on the market?
Why do Steel building accessories need to be fireproofed?
1. The total weight of the building using Steel building accessories is light, which is about half of the concrete structure. At the same time, it can greatly reduce the foundation cost of the house.
2。 The construction speed of Steel building accessories is fast, and the construction period is at least one third shorter than that of the traditional residential system. A 1000 square meter building can be completed in only 20 days and five workers.
3. The house with Steel building accessories has good environmental protection effect. This is because the consumption of sand, stone and ash is greatly reduced during the construction of the residential buildings built by Steel building accessories. The materials used are mainly green, 100% recycled or degraded materials. When the buildings are demolished, most of the materials can be reused or degraded without causing garbage.
4. Steel building accessories is welcomed by everyone for its flexibility and abundance. Large bay design, indoor space can be divided by multiple schemes, which can meet the different needs of users.
5. The use of Steel building accessories meets the requirements of housing industrialization and sustainable development. The steel structure is suitable for mass production in the factory with a high degree of industrialization. It can integrate advanced finished products such as energy saving, waterproof, heat insulation, doors and windows, and apply them in a complete set, integrating design, production and construction, so as to improve the level of construction industry.
1. u-shaped bracket
The u-shaped bracket is also one of the important accessories of Steel building accessories. The bracket is used for the connection between the ground and the main material. In addition to the fixing function, the u-shaped bracket can also balance the overall bearing force.
2. Fishing rod bracket
The fishing rod bracket of the steel structure frame is a single-unit fixing device accessory, which is used for the initial fixing of the single-unit room.
The temperature resistance of steel is poor, and many of its properties change with the rise and fall of temperature. When the temperature reaches between 430-540℃, the yield point, tensile strength and elastic modulus of the steel will drop sharply, and the load-bearing capacity will be lost. Steel building accessories must be maintained with refractory materials.
Qingdao Xinguangzheng Steel Structure Co., Ltd., as a Chinese pioneer in producing Steel building accessories, can ensure the products’ quality and the after-sales service
Project Area: 23408 sqm
Project Usage：Pakistan Cola workshop
Project Location: Lahore, Pakistan
Project weight of steel structures： 760 tons.
Wall & Roof：0.5mm galvanized steel sheet +50mm glass wool+0.4mm galvanized steel sheet.
Span: Multi-Span 100m and 50m
Total Height: 12m
Project picture of Pakistan Prefabricated Steel Structure Construction Cola Workshop :
A brief introduction to you about our company first, then you can contact me if there is suitable project in the future.
1200 workers, 360000 ㎡ non-dust workshop, 25 years experience, CE, ISO9001, ISO9712, ISO3834, BV, SGS certificated, one hour reach Qingdao port, our company, as a manufacture, this is how we keep good quality and competitive prices for global valued customers.
We provide steel building design, farm house design, manufacture and installation service.