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

Maintenance of steel structure space frame industrial plant

The steel structure space frame industrial plant has the advantages of beautiful design, diversified body shapes, bright colors, high factory production of steel components, low engineering cost, short capital construction period, simple installation and construction, and flexible layout. Steel has the advantages of light weight, easy design and calculation, recyclability and other advantages, so that steel structures are used in large quantities in contemporary industrial plants. At the same time, the maintenance of the steel structure workshop is very important in the later use. SAFS briefly introduces the maintenance and maintenance methods of the steel structure workshop in the later period of use.

The picture project is selected from: https://www.safsteelstructure.com/application-center/

The following are three maintenance methods for steel structure space frame industrial plant maintenance:

1. The steel structure workshop is the entire connection of the structural parts. Electric lighting equipment and wires cannot be directly tied to the steel components. It is necessary to set up wire pipes or wire groove blocking devices to avoid electric shock;

2. The steel structure components should be repainted and maintained every 3 years to prolong the overall appearance and service life of the steel structure workshop;

3. After the installation of the steel structure space frame workshop is completed, the owner cannot change the structure without permission, cannot remove any bolt components, and cannot add or reduce partition walls.

If it is necessary to change, it should be negotiated and agreed with the steel structure manufacturing company before the change

Advantages and disadvantages of steel structure space frame connection

 1. Welding

Advantages: strong adaptability to geometric frame shapes and simple structure. Without weakening the section, automatic operation can be realized, the connection has good airtightness and high structural rigidity.

Disadvantages: high material requirements, reduced bearing capacity of welding residual stress and residual deformation compression components, welded structure is more sensitive to cracks, and the problem of low temperature cold brittleness is obvious.

2. Riveting

Advantages: reliable force transmission, good toughness and plasticity, easy quality inspection, and good resistance to dynamic loads.

Disadvantages: complex structure, expensive steel and labor.

3. Ordinary bolt connection

Advantages: easy loading and unloading, simple equipment.

Disadvantages: The bolts should not be sheared when the accuracy is low. When the bolt precision is high, the processing and installation are complicated and the price is relatively high.

4. High-strength bolt connection

Advantages: The friction type shear deformation is small, the elastic performance is good, and it is more suitable for the structure of the follow-up load. The bearing capacity of the pressure bearing type is higher than that of the friction type, and the connection is compact.

Disadvantages: The treatment of the friction surface, the installation process is slightly complicated, and the cost is slightly higher. The shear deformation of the pressure-bearing connection is large, and it cannot be used in the structure that bears the dynamic load.

The geometric structure content is selected from: https://www.safsteelstructure.com/

Xuzhou SAFS Steel Structure Engineering Co., Ltd.

Space Frame Structure Engineering

 1. The quality of the steel structure space frame project is affected by many factors. The quality of the steel is one of the most important aspects. It directly affects the use time of the space frame. Therefore, the choice of space frame building materials is very important. , to avoid buying inferior products.

2. Under the background that the state advocates energy saving and recyclable materials, the space frame residential building will show a trend of geometric development. Among them, steel plates, hot-rolled H-beams, steel pipes, and cold-formed steels are the main products, and products with steel strength of Q345 and Q235 are the first choice of customers.

3. The space frame structure is generally composed of roughly the same lattice or smaller sized units (repeated). Often used in roof structures. The joints of plate space frame and double shell space frame made of steel mainly include cross plate joint, welded hollow ball joint and bolt ball joint.

Space frame structure engineering is a new type of energy-saving and environmentally friendly building system, known as "green building". Space frame engineering has huge development space due to its light weight, high strength, good seismic performance, and the advantages of recycling and comprehensive use.

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Techniques and details of high-altitude bulk loading of space frame roof structures

The space frame roof structure installation adopts high-altitude bulk, so it is necessary to set up an installation platform. In order to improve the construction progress, a scaffolding platform is adopted. The platform surface should be between 0.3 and 0.8m from the bottom chord of the space frame, and the space frame steel bar should be placed on the ground according to the construction sequence, and hoisted to the installation platform in sequence. Each lifting should not exceed 0.5 tons, and the lifting equipment should be hydraulic crane on site. After the components are lifted to the platform, they should be placed according to the installation position immediately to prevent the components from being stacked together. Before the installation of the grid, Before installation of each space frame,in addition to the careful inspection of the steel bar and bolt balls during production, the number check of the steel bar and the bolt balls and the inspection of the external dimensions should be carried out to match the positive and negative deviations of the steel bar and bolt balls.

Generally speaking, there are two main ways to install the space frame roof structure, one is the direct splicing of steel bar, and the other is a small unit installation. During the installation process, the above two methods can be combined and constructed at the same time, and the high-strength bolts must be in place when tightening. The multi-pass tightening method is adopted. After the bolts are tightened, the set screws are tightened. Finally, all the joints and the redundant bolt holes on the node ball are filled tightly with an oil brush, and two coats of anti-rust paint are applied.

Image credit: safsteelstructure.com

How to Control the Installation Deviation of the Bolt Ball Space frame

        There are generally deviations in the installation of the bolt ball space frame. How to reasonably control deviations during installation and avoid deviation accumulation? SAFS steel structure Engineering Company has organized three ways for your reference:

1. The embedded parts should be leveled and the axis of the spring should be leveled to ensure that the rubber bearings meet the installation requirements under the design standards. Properly dispose of embedded parts that do not meet the conditions.

2.  Prevent the overall space frame from settling before forming. Give enough grid support points on the actual operating platform.

Image from: https://www.safsteelstructure.com/

3. After each unit or multiple units are installed, the grid must be checked and recorded step by step to prevent deviations in the processing and production process from accumulating during installation. If it is found that the deviation accumulation is too large in the whole process of the installation, which affects the subsequent installation, it is necessary to stop the installation, analyze the reasons, and make rectifications in time.

For large-span space frames, when installing a single-span, the bolts cannot be tightened at one time, so as to adjust the deviation of the rubber bearing caused by the accumulation of deviations or the insufficient support of the scaffolding platform in the later stage. Adjusting the height of the platform support can be adjusted with a jack, but the strength and stability of the scaffolding must be ensured.

The design and material of the steel structure carport must have corresponding requirements

 If we want the large steel structure carport we build ourselves to be of good quality, then we must have corresponding specifications in the design and selection of materials. How to do it? Here are five points to share with you.

First of all, when we design, we must consider the toughness of the SAFS steel structure carport. When designing, we cannot because the plasticity of the steel is better and ignore the effect of force, so that after the construction is completed, there is only aesthetics.

Second, after the construction is completed, we must also regularly repair it, especially with the increase of use time, there will be some problems on the surface of the steel structure carport, we must repair it as soon as possible.

Third, when we choose steel, we must choose good toughness, so that when we use it, we can reduce the cracking situation.

Fourth, when we are processing, we must choose the appropriate processing technology according to the state of the steel, otherwise it will have a great impact on the strength and toughness of the steel structure carport.

Official website consultation: https://www.safsteelstructure.com/

Fifth, the material used in the steel structure carport must have good durability, so that it can have a good life when it is used. Otherwise, we need to replace or repair it regularly when we use it.

Precautions of space frame construction in rainy period

In the rainy period, the construction of the space frame structure project must be considered carefully, pay attention to the influence of various factors, and make the correct treatment method according to the actual situation.

1. For the earthwork piled up on the construction site, measures should be taken to prevent rain erosion around the site. For example, put strip stones around to prevent the earthwork from being washed into the excavated foundation groove or pipe trench by rainwater. Or bury some infrastructure that has already been completed. After the foundation construction is completed, the backfilling work around the foundation pit should be carried out as soon as possible. When artificial precipitation is stopped, the anti-floating stability of the box-shaped foundation and the buoyancy of groundwater on the foundation should be checked, and the anti-floating stability coefficient should not be less than 1.2. Stop construction when the impact of rain is great. What is being excavated is mainly supported by slowing down edge breaking.

2. The working surface of the space frame during the rainy season should not be too large, and should be completed segment by segment and segment by segment; when the rainfall is heavy, the earthwork construction should be stopped in a large area; For the foundation soaked by rainwater, necessary work such as excavation and backfilling should be done to restore the bearing capacity of the foundation; important or special projects should be completed before the rainy season.

3. To prevent the slope from being washed away by rainwater, nail wire mesh can be added to the slope, and 50cm of fine stone concrete can be applied; the slope can also be covered with plastic sheets;

4. In order to prevent the foundation pit from being soaked, drainage ditch and water collecting well should be made in the foundation pit and necessary drainage force should be organized during excavation; the pool and basement located at the bottom should be carefully considered during construction. If the pre-consideration is not careful, after pouring and pounding, in the event of heavy rain, it will often cause the basement and pond to float up. ​​

5. When excavating foundation trenches or pipe trenches in rainy period, attention should be paid to the stability of the slope. If necessary, slow down the side slope or set up supports. The inspection and control of side slopes and supports shall be strengthened during the construction of space frame engineering; supports shall be provided for excavated foundation trenches or pipe trenches. ​​

6. The earthwork backfilled before the rain should be rolled in time to form a certain slope on the surface, so that the rainwater can be automatically discharged.

To sum up, in the construction of space frame structure, we must pay attention to the influence of the unique influencing factors in the rainy period, so as to solve unique problems in the rainy period, and strengthen the safety and stability of the space frame structure.

Space frame industry knowledge: https://www.safsteelstructure.com/news-center/