Installation steps of steel structure columns

The installation of steel structure columns is one of the difficulties in the construction of the radiant chamber of the heating furnace, and ensuring the verticality of each column is the key to the installation of the columns. In order to ensure the construction quality of the column, the "cross reinforcement symmetrical erection method" is used for installation during the construction. Specific steps are as follows:

1. Use a 50t truck to hang the first column on the ring beam at the bottom of the furnace. After aligning with two theodolites from two vertical directions, use four steel wire ropes to seal and temporarily fix it from four directions, and weld the column feet to the ring beam at the bottom of the furnace.

2. After erecting the second column in the same way in the symmetrical direction, use two seamless steel pipes (with connecting plates in the middle) to connect the two columns at about 2/3 of the height and reinforce them into sheets.

3. Use the same method to erect the third and fourth uprights in the vertical direction, and use two steel pipes to reinforce them horizontally. After connecting the four uprights into a frame, remove all the reinforcing cords.

4. With these four columns as the support, a 50t truck is used to erect the other 12 columns in turn. For each erected one, complete the installation and spot welding of the reinforcing ring beam below the cross reinforcement with the previous column at the same time. Then erect the next one in the same way until all are erected.

A 50t truck can be used to hang the hoarding. According to the layout plan, along the mesh steel skeleton from the lower ring to the upper ring of the hoarding. Before the hoarding, according to the arrangement of the board, there is no reinforcing ring beam at the upper and lower ends of the board, and a circle of wall bars can be temporarily set up to facilitate the hoarding and ensure the quality.

Testing method for bolt ball of steel structure space frame

       1. Bolt balls and materials needed to manufacture bolt ball joints. Its varieties, specifications, performance, etc. should meet the national product standards and design requirements.

Inspection method: Check the product's quality qualified documents, Chinese signs and inspection reports.

2. The bolt ball shall not have burning, cracks and folds.

Inspection method: Check a part of the bolt ball of each specification, observe with a 10x magnifying glass and inspect the surface.

3. The bolt ball thread size and thread tolerance should comply with the current national standards.

Inspection method: Check a part of the bolt ball of each specification and measure it with a standard thread gauge.

4. The size and allowable deviation of bolt ball diameter, roundness, and the angle between the center lines of two adjacent bolt holes should comply with the "Code for Acceptance of Construction Quality of Steel Structure Engineering".

Inspection method: Check a part of the bolt ball of each specification, and check whether it meets the specified value with a caliper and an indexing head instrument.

The above four are the detection methods of bolt balls for steel structure space frame. We can apply them to the actual inspection to improve the overall quality of the project.

Technical requirements for the production of space frame steel structure accessories

The current space frame and steel structure accessories include blanking plates, grid rods, bolt balls, high-strength bolts, cone, non-groove nuts and other products. There are high requirements for the production technology of these accessories. Improving production skills can improve the performance of the product is beneficial for the accessories to ensure the entire safety and stability of the building during construction. The following SAFS Steel Structure Space Frame Engineering Co., Ltd. will give you a detailed introduction.

For space frame steel structure accessories, it is necessary to gradually improve the performance of the product. It is very important to add the content of production technology. In the traditional production process, there are many impurities in the produced product, which affects the later use of the product., and the time of use will also be reduced. For the entire project construction, the overall project quality and safety factor will also be reduced, so for space frame steel structure buildings, they will have higher requirements for space frame accessories. The emergence of these situations also forces manufacturers to upgrade their production technology.

The wear resistance and anti-corrosion requirements of steel structure space frame accessories are relatively high. At the same time, due to these accessories are used in the construction industry, they have high requirements for the overall safety factor, because they need to be used after the completion of the large-span space frame project. , If the safety factor does not meet the standard, it will have a great impact on the later use of the building, and affect the service life of the building. Many real estate development industries have the highest requirements for the quality of space frame products, even if the price of the product is relatively expensive, but they are also willing to buy more products, so for space frame manufacturers, they need to learn from foreign production technology and join domestic product production, so that they can have an absolute competitive advantage in the market competition.

How to use steel structure for large-span roof construction

Large-span roof construction is very important for buildings, so what is the process of using steel structure for large-span roof construction? Is there anything to pay attention to? China SAFS steel structure takes everyone to learn together. The space frame manufacturer analyzes the steps of steel structure roof construction:

①When laying glass wool roll felt, the veneer should face the indoor side, perpendicular to the purlin, leave about 20 cm of rolled felt at the eaves of one side, and fix it on the outermost purlin with a special clamp or double-sided tape;

② Ensure that the roll is aligned and tensioned when unwinding, lay the glass wool roll felt on the other side of the eaves, also leave 20 cm of roll felt, and fix it on the outermost purlin with a special clamp or double-sided tape;

③ The two rolls of cotton are connected together by binding with a stapler on the veneer flash;

④ Install the roof color steel plate, remove the fixtures at the eaves on both sides, and use the reserved 20 cm veneer to close the edge of the glass wool;

⑤ Pay attention to maintaining the tension and alignment of the glass wool roll felt, and the joint between the rolls is tight. When the longitudinal overlap is required, the overlap joint should be arranged at the purlin;

⑥ According to the needs of the project, in order to avoid the generation of cold bridges, some hard thermal insulation materials can be considered on the purlins.

The space frame company analyzes three installation methods for the structure of a single-story industrial plant

       SAFS Steel Structure Space Frame analyzes three installation methods for single-story industrial plant structures: piece-by-piece hoisting method, inter-node hoisting method and comprehensive hoisting method.

1. Piece hoisting method

The hoisting method in parts is that when the plant structure is hoisted, only one or two components are hoisted each time the crane is hoisted. Generally, all components are hoisted in three times. The first time to hoist the column, and to correct and fix it; the second time to hoist the crane beam, the connecting beam and the inter-column support; the third time to hoist the roof truss, skylight frame, roof panel and roof support between sections.

Part-to-piece hoisting method, the same type of components are hoisted every time the crane is used. The crane can be selected according to the weight and installation height of the components. Different types of cranes are selected for different components, which can give full play to the working performance of the crane. During the hoisting process, the number of rigging changes is small, the hoisting speed is fast, and the efficiency is high, which can provide sufficient time for component correction, welding and fixing, and concrete pouring and curing.

2. Comprehensive hoisting method

The comprehensive hoisting method means that part of the components in the building (columns, inter-column supports, crane beams and other components) are hoisted by the separate hoisting method. Part of the components (all the components of the roof) are hoisted by the internode hoisting method. The comprehensive hoisting method absorbs the advantages of the piece hoisting method and the inter-node hoisting method. Therefore, this method is mostly used in structural hoisting.

3. Inter-node hoisting method

The inter-node hoisting method means that in one operation of the crane during the hoisting process, all or most of the various types of components are hoisted between the sub-nodes. The advantage is that the crane has a short walking route, and the working surface can be created for the next process according to the interval in time. However, it is required to choose a crane with a larger lifting capacity. The performance of the crane cannot be fully exerted, the rigging is frequently replaced, the installation speed is slow, the supply of components and the layout are complex, and the time for component correction and post-fixing is urgent. This method is generally not used for the hoisting of reinforced concrete structure workshops, and is only suitable for the installation of steel structure workshops and gantry structures.

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.