Influence of temperature difference on steel space frame structure construction engineering

What are the effects of temperature difference on steel space frame structure construction projects? The phenomenon of thermal expansion and contraction of objects has obvious influence on the installation of column components in steel space frame structure buildings. The independent steel column hoisted on the column foundation is exposed to sunlight, causing it to have front and back sides, and there is a temperature difference on both sides and deformation, which will cause the steel column to tilt. As time goes by, the steel columns tilt westward in the morning and eastward in the afternoon. The steel columns of large steel structure workshops, commercial steel structure buildings, and municipal steel structure buildings all have the phenomenon of vertical changes. In the measurement adjustment, pay attention to the following points:

1. Distinguish whether the component is the original bending or the bending caused by the weather, so as to prevent unnecessary repeated adjustment;

2. You can choose to adjust the measurement in the morning or at night (of course, cloudy days without temperature difference are better) to eliminate the existence of temperature difference;

3. Or establish a column as a standard column, install it when there is no temperature difference, and correct its verticality deviation to ±0. When calibrating other columns, the verticality of the standard column shall prevail. Re-calibrate other steel columns to make their vertical values and inclination directions consistent with those of standard columns;

4. Or use the temperature difference displacement value formula to calculate the displacement value, so as to correct the displacement of the column end, and the direction can be consistent with the calculation.

Five advantages of Chinese space frame structure manufacturers

In recent years, due to the rapid development of electronic computing technology, the calculation problem of high-order statically indeterminate structures of steel structure space frames has been solved, and the development trend of steel structure space frames in both the formal level and the specific application level is the same.

At this stage, the focus is on large and medium-span commercial buildings, such as gymnasiums, hangars, exhibition halls, waiting rooms, gas stations, coal bunkers in power plants, etc. Large and medium-sized workshops have been gradually applied and promoted. The greater the distance, the more obvious the advantages of choosing this construction method and the practical effect of economic development.

China's space frame structure factory has five major advantages:

1. The manufacturer will actively contact the whole process of multi-channel processing technology such as flat roof, home improvement ceiling, stairway, civil engineering, water and electricity, anti-corrosion and thermal insulation engineering related to this construction project, so as to help you feel at ease and labor-saving;

2. Will actively review the rationality of the space frame engineering drawings you give, and give you clear opinions and suggestions on the results of the combing, you only need to make strategic decisions;

3. The manufacturer will reasonably arrange the construction period and do a good job of frame-line construction;

4. The manufacturer will provide complete raw material acceptance for the entire project;

5. China's space frame structure manufacturers will provide tracking and after-sales maintenance service project tracking services in the whole process of new project application in the later stage of the space frame project.

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How to Tighten the Dry Coal Shed Space Frame Bolts

SAFS Space Frame Bolt Ball

1. In the middle and late application of the dry coal shed space frame, the corrosion resistance of its own stainless steel sheet is weak, because it is impossible to completely block the gas with architectural coatings on the construction site, and it is in a closed and restricted space, accumulating The unique chemical substances such as coal also have many uncertain factors, which cause and accelerate the corrosion of the steel structure.If there is a lack of timely maintenance measures during application, and in the whole process of application, if you do not pay attention to the extrusion of the rubber bearing and the bending of the components caused by the stacking pressure of coal, this will give safety to different levels. lead to a safety hazard or an immediate accident.

2. At the construction site of the space frame of the dry coal shed, in order to control the cost or not attach great importance to the construction party, the construction party will not carry out the engineering construction or timely engineering construction of the fireproof material for the surface layer of the steel structure. The heat resistance of stainless steel sheet is weak, and many of its properties change with the rise and fall of temperature. When the temperature reaches 430-540 °C, the yield limit, compressive strength and elastic mold of the stainless steel sheet will be greatly reduced, and the bearing capacity will be lost.

Steel structure manufacturers analyze the effects and disadvantages of steel structure buildings

What is the effect of steel structure manufacturers' steel structure buildings? What drawbacks need to pay attention to? We often see elegant streets in movies, with quaint but elegant buildings. This kind of building is built with wood structure or light steel structure, but now with the continuous rise of wood price, the market of light steel structure system gradually grows rapidly and is gradually widely accepted by the market, which is called building system.

steel structure buildings 

Steel structure is currently controversial as a prominent architectural form. Of course, there has also been a lot of negative news. It is not without news that steel buildings are degraded or collapsed. This has led many to suspect that the thermal conductivity of steel structures is large.

 

Such as composite board, insulation board, PVC and so on. The melting point of steel is 1400~1500, and the softening temperature of steel is about 500. When building temperatures hit around 500, it's not something we need to think about anymore. The steel structure is covered with fireproof gypsum board on both sides of the wall and the ceiling of the floor, and is protected with gypsum board on the ordinary fire wall and basin parapet, which can meet the fire protection requirement of one hour. The glass fiber filled between the wall and the wall column floor grid also has a positive protective effect on fire prevention and heat transfer.

 

If you insist that the fire protection effect of steel structures is not good, it is only a one-sided analysis, and you want to judge the fire performance of steel structures, not the fire performance of individual materials. After all, steel structure buildings are not made of steel plates, composite panels, thermal insulation surfaces, and PVC, but various materials are designed and perfected. In fact, many steel structures seem to be flammable substances. Why does every factory say that the fire resistance rating of steel structures is four, because it is impossible for anyone to use flammable substances to build houses.

 

In the sense of environmental protection, the steel structure is a green building, it is a dry work, does not require a lot of water, and will not waste water resources, no construction waste will be generated during the construction process, no noise, and the most important thing is steel The structure is a recyclable material, which greatly reduces the loss of resources.

 

Generally, all building materials of steel structures must be customized in advance in the factory, and after assembly, they can be directly pulled to the site for modular assembly. So it saves a lot of time required to build the steel structure.

steel structure construction 

In the construction process of steel structure, a lot of materials are used in thermal insulation, fire prevention, sound insulation, etc., so it is not only suitable for residential convenience, but also has advantages in steel structure industrial buildings, and the plasticity of steel structure is relatively strong,The shapes are also varied.

Control of 3D Space Coordinate of Steel Space Frame

For steel space frame structure, precision instruments must be used for the spatial positioning of ball joints. Therefore, it is necessary to convert the original coordinates into polar coordinates, and to determine the spatial position of the spherical node by means of point angle ranging and elevation positioning. The theodolite, far-infrared rangefinder, and level can be used to achieve the design accuracy. Numerous data from around the world show that positioning with the center of the dot and mounting from the outer ring inward has more advantages, it can reduce the closure error. According to the hoisting capacity, we divide it into four ring belts from the outside to the center, and adopt flow operation. After the small units are prefabricated on the ground, they are assembled one by one. The small-unit ball nodes on each annular belt are provided with ball bases on the scaffolding. The three-dimensional space coordinates of this base completely correspond to the spherical nodes of the small unit after the measurement. Dimensions and coordinates should be checked and recorded. Due to the flow of water from the outside to the inside, the three-meter positioning method can be realized. The ball base on the scaffold should be made into a form that is easy to adjust, and it should be temporarily fixed after adjustment.

SAFS steel structure entrance

The above is an introduction to the control of the three-dimensional space coordinates of the steel space frame, which can help you understand the space frame structure faster. Of course, you can go to our homepage to see more related content.

How to control the quality of bolted connection construction of steel structure engineering? The high-strength bolt connection project is also one of the most important sub-items of steel structure engineering, and it is also one of the weak links in the current construction quality, mainly in:​

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(l) Some high-strength bolts are shoddy (replace high-strength bolts with ordinary refined bolts);

(2) The surface treatment of high-strength bolts does not meet the requirements of the specification, including surface treatment, leveling and closeness, and quality of bolt holes;

(3) The tightening of high-strength bolts is not carried out according to the specifications. For example, the initial tightening and final tightening are completed at one time, no torque wrench is required, and it is entirely based on subjective estimates.

In order to ensure the construction quality of the high-strength bolted connection project, the supervising engineer must have a high sense of responsibility. While urging contractors to improve quality awareness, strengthen quality management, and implement quality assurance measures, work methods such as side-by-side supervision and parallel inspection are actively adopted. Only in this way can the construction quality of the high-strength bolted connection project be under strict control.

Introduction of four major systems in large-span steel structure engineering buildings

How many systems are there in large-span steel structure engineering buildings? Steel structure engineering is a direct reflection of the current level of construction in the construction industry. Therefore, both in industry and commerce, steel structure engineering has developed rapidly, and steel structure engineering has also attracted much attention. At present, in the field of steel structure engineering, there are mainly four kinds of structural models, the specific categories are as follows.

Image from SAFS Steel Structure Engineering Company.

1. Cold-formed thin-walled steel system. In this system, steel structural members are cold-formed with thin steel sheets into C-shaped and Z-shaped members, which can be used alone or in combination. However, self-tapping screws are used for the connection between components, and the stiffness of the joints is not easy to guarantee. It has poor lateral force resistance and is generally only used in residential buildings or villas with 1-2 floors.

2. The frame system. This kind of steel structure project is set up with steel frame both vertically and horizontally, and the doors and windows can be set flexibly to provide large bays. Therefore, it is widely used in multi-storey steel structure houses.

3. Frame support system. Under this system, steel structure engineering generally has multiple lateral force resistance systems. Beam-column connections and column foot connections can be designed as hinged semi-rigid connections. The construction structure is simple, the foundation mainly bears the axial force, and the size is small.

4. Frame-shear wall system, mainly used in low-rise residential buildings. Currently, it is widely used.

These four steel structure systems also constitute the main structural system of steel structure engineering. It also plays an excellent role in promoting the development of steel structure engineering.

Specific inspection items and methods for steel structure spherical space frame

The specific inspection items of the steel structure spherical space frame mainly include the following five aspects. SAFS steel structure will introduce the specific details to you:

1. The first is the inspection of raw materials. Check the factory certificate, test report, etc. of the material, and you can also sample for re-inspection.

2. Ultrasonic flaw detection is mostly carried out by sampling method when testing welds. If unqualified, sampling test is required.

3. The tensile and compressive bearing capacity testing is similar to the welding seam testing. Three pieces are randomly selected from each batch for tensile and pressure testing.

4. The surface of the welded ball needs to be checked with an arc-shaped die and a steel ruler. Spot check 5% of nodes according to various specifications, and require no less than 5 pieces of each type.

5. The detection of the thinning of the wall thickness of the finished ball is similar to the detection of the surface of the welded ball, but the method used is an ultrasonic thickness gauge, and the extraction method is the same.

The above are the specific inspection items of SAFS steel structure spherical space frame. If you want to know more details, please submit a message below.

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Steel structure sun sheds are widely used

In our daily life, the application of steel structure sunshade is more and more extensive. Why do so many builders like to use steel structure to build buildings? SAFS steel structure shares the following 6 points with you:

1. The strength of this building is very high, because most of the main body of the steel structure sun shed uses steel as the raw material for production and installation, so when it is used, the age will be increased accordingly.

2. We all know that steel is more prone to rust, and in order to reduce this situation, the steel structure sun shed has been treated with anti-rust treatment on the frame.

3. In order to make the shed feel brighter, the strength of the shed roof is strengthened, and the feet are firmly welded.

4. It has good impact resistance. Because of the stability of the structure, the steel structure sun shed can be well adapted to bad weather.

5. The appearance is simple and elegant, because the steel has good toughness, so it can well meet the needs of users when designing. The finished product designed is also in line with the aesthetics of the public.

6. Simple installation. Because most of this raw material is produced by factories, it can be installed quickly after mastering the corresponding technology during construction.

Xuzhou SAFS Steel Structure Engineering Co., Ltd.

Two elements of quality control of steel space frame structure processing

                1. Steel structure blanking control

Before cutting, the cleanliness, flatness, cutting size, section roughness, verticality, notch depth and groove angle of the steel surface meet the requirements; the surface of assembly and welding needs to be treated.

Setting out: The assembly of various components and parts, and the assembly of pre-assembled components require professional setting out workers to accurately stakeout on the machined surface and assembly large template. After setting out, it must be checked by an inspector to ensure that the geometry and angle of the component machining are accurate.

The drilling template, the connecting plate after drilling, and the gusset plate correspond to the body reference line; strictly control the eccentricity of the hole, the offset of the hole distance, the hole distance, the roundness and perpendicularity, and the surface quality of the hole wall and hole edge. In order to ensure the accuracy and quality of drilling, when using die drilling, a setting out worker must set out a line to mark the reference axis and the center of the hole.

2. Steel structure assembly control

Strength, rigidity, levelness and related fixtures of work platforms and tire frames; dimensions of details and special tires; parts material, number, size, machining accuracy, quantity, surface treatment of connections and welds; datum planes , datum line, cross center line and assembly position line of parts; assembly position, direction, angle, concentricity, verticality, camber, groove angle, blunt edge, gap, gasket seal and joint dislocation of parts; Assembly sequence and method, additional welding shrinkage and machining allowance; size, length, spacing, location and surface quality of tack welding.

Component assembly: Component assembly refers to spot welding positioning and fixing before submerged arc welding. Before assembly, the small material should be corrected, and the setting out personnel should draw the center line and positioning line. After passing the inspection, spot welding is fixed, and after inspection, it is delivered for formal welding.

Article source: https://songmoon0115.medium.com/two-elements-of-quality-control-of-steel-space-frame-structure-processing-26f89f8dd97a