Analysis on the content of supervision work in the installation stage of steel structure engineering in China

Large-span steel structure engineering is a structure mainly made of steel, and it is one of the main types of building structures. It is the most common structural form in modern construction engineering. Let's analyze the content of the supervision work in the installation stage of China's steel structure engineering:

The supervision work in the installation stage of large-scale steel structures is mainly to supervise the operation of the internal management system and quality assurance system of the contractor, to supervise the implementation of various technical and organizational measures designed by the construction organization, and to carry out construction in strict accordance with the current national norms and standards for steel structures. The supervision of the steel structure installation stage should focus on the following links: The rationality and implementation of the installation plan, installation measurement, connection of high-strength bolts, installation welding quality, actual measurement of installation size deviation, painting, etc. Supervision work should strengthen on-site inspection, parallel inspection and side station supervision. Especially in the case that the quality of some steel structure construction units is low and the construction is still under-standardized, it is more practical to do a good job of on-site inspections and side stations to ensure the construction quality of steel structure projects.

Introduction to the painting process of large space frame steel structure

Compared with other building structures, large-scale space frame steel structures have more advantages. You can refer to the industry knowledge I wrote before. On the news page of the SAFS steel structure official website, today we will introduce its painting process:

Inspection and acceptance of paint coating for space frame steel structure:

1. During and after the surface paint coating construction, the painted workpiece should be protected to prevent flying dust and other debris;

2.  Paint coating post-processing inspection,  it should be consistent in color, bright in color, bright, without wrinkle and pimple;

3. To measure the thickness of paint film, use a touch-type paint film thickness gauge to measure the thickness of the paint film. The paint film thickness gauge generally measures the thickness of 3 points and takes the average value.

Space frame steel structure paint finished product protection: 

1. After the space frame components are painted, they should be temporarily enclosed and isolated to prevent stepping on and damage to the coating;

2.  After the space frame member is painted, if it encounters strong wind or rain within 4 hours, it should be covered to prevent dust and moisture from sticking to it and affect the adhesion of the coating;

3. When the painted components need to be transported, attention should be paid to prevent bumping, prevent dragging on the ground, and prevent the coating from being damaged;

4. Do not touch the acid liquid on the mesh frame components after painting to prevent the coating from being bitten.

The quality problems that should be paid attention to in the paint of space frame steel structure: 

1. The temperature of the paint coating operation should be between 5 and 38 °C. When the weather temperature is lower than 5 °C, the corresponding low-temperature coating material should be used;

2. When the temperature is higher than 40℃, stop the paint coating operation. After treatment, the coating operation is carried out;

3. When the air humidity is greater than 85%, or there is condensation on the surface of the component, do not carry out the paint coating operation, or carry out the coating operation after treatment;

4. Before the production of the space frame structure, the hidden parts of the components and the parts of the structure interlayer that are difficult to remove rust should be removed in advance and painted in advance.

Features of building roof steel color plate

Color steel plate is a kind of steel plate with organic coating. It has a wide range of applications and is mainly used for the walls and roofs of large public buildings, public workshops, prefab houses and other places.What are the characteristics of the steel color plate?

 

First of all, steel color panels are divided into veneer, color steel composite panels, floor decks, etc., which are generally used in the walls and roofs of public buildings, workshops, prefab houses and integrated houses. Because the composition is a very light organic material, it still weighs a little less than normal bricks. And it is resistant to corrosion, high temperature and high strength. So the scope of application is also wider. Because there are many types, there are more places to use.

 

Secondly, because the spliced ​​installation method is used, its installation and disassembly are more convenient. The rich colors meet the needs of many prefab buildings and achieve customer satisfaction. And the material is non-combustible. Fully meet the fire protection requirements of the mobile house. Because of its strength, it can adapt to most bad weather and terrain, and can still be used normally. The cost of production and purchase is also lower than that of general building materials, which can save some costs.

 

Finally, the steel color plate can maintain a large degree of heat preservation and heat insulation, and has the effect of maintaining room temperature. To a certain extent, the steel color plate can replace the use of bricks, will not cause a lot of construction waste, is environmentally friendly, and has a long service life, and it is not easy to rust. It can also be recycled and reused, and it is a very environmentally friendly new building material.

Why is steel structure processing and manufacturing an inevitable product of the era of economic development?

In recent years, a large number of new building materials have been developed and researched. With the promotion of energy saving, environmental protection and green buildings, steel structure processing and manufacturing was born. The construction field is no longer the era when reinforced concrete dominates, and because of the advantages of steel structure itself. On a global scale, especially in some areas of developed countries, steel structures have been reasonably and widely used in the field of construction. Why is steel structure fabrication popular in the construction industry? How is its unique advantage manifested? The following SAFS steel structure processing manufacturers will analyze it for you, and hope to help you.

The steel structure engineering system has the comprehensive advantages of light weight, quick installation, short construction period, good seismic performance and less environmental pollution.

The specific performance is as follows:

Earthquake resistance: Insiders know that the roof structure of low-rise villas is basically a triangular roof truss made of cold-formed steel members, which has stronger earthquake resistance and can be used even in places with high earthquake magnitudes.

Wind resistance: Steel structure buildings are light in weight, only one-fifth of that of brick-concrete structures. It can resist the hurricane of 70 meters per second, so that life and property can be effectively protected.

Durability: Light steel structure residential structures are all composed of cold-formed thin-walled steel member systems. The steel frame is made of super anti-corrosion high-strength cold-rolled galvanized sheet. Effectively avoid the influence of corrosion of steel plates during construction and use, increase the service life of light steel components, and make the service life of steel structures up to 100 years.

Buildings processed with steel structures also have the advantages of comfort, heat preservation, and energy saving, which are not available in traditional reinforced concrete buildings. So some people say that the steel structure even prolongs the life of the house, and there is some truth to it. It can be seen that the steel structure series products are still very useful, and the application will be more extensive.

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:​

steel structure engineering：https://www.safsteelstructure.com

(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.