Precautions for bolt connection during steel structure building construction

      The quality of steel structure construction is related to the safety of the construction of the building afterwards, so the quality control of each construction link is very important. So what do you need to pay attention to for steel structure bolt connection? The following is introduced by SAFS Steel Structure Company.

The bolt connection is the key task of the quality control of the steel structure. We need to check each bolt after tightening to prevent the phenomenon of leakage. For those phenomena that are not tightened or twisting, we must re -tighten or replace bolts.

1. Do not use gas cutting

The bolts in the steel structure building are usually used in ordinary bolts and high -strength bolts. The connection of ordinary bolts must not be padded with more than two spacers at each end of each bolt. And if the bolts are misplaced, they cannot be expanded with gas cutting, and they must be used to use a knife or re-cutter.

2. High-strong bolt quality control

After the bolt is tightened, the exposed thread must not be less than 2 to 3 thread distance. The control of high -strength bolts is the connection of the bolt, the treatment of the friction surface, and the frictional surface anti -slip coefficient. The initial twist and final twist of the bolt connection, and the torque value, the surface of the node is damaged and deformed.

3. Installation of high -strength bolts

During the installation process of the high -strength bolt of the steel structure, the contact surface must be flat, and the area of contact must be greater than 75%, and the gap of the edges must not be greater than 0.8 mm. The high -strength bolt cannot be used as a temporary installation, and the tightness of the bolt should be performed in one direction. The bolts installed every day must complete the final tightening work and check them one by one to prevent leakage.

Different steel structures have different fire protection measures

1. Expansive material

The steel structure fireproof coating is used to protect the components. This method has the advantages of good fireproof and heat insulation performance, and the construction is not limited by the geometric shape of the steel structure. Belongs to modern advanced fire prevention technical measures.

 

2. Outer cladding

It is to add an outer cladding on the surface of the steel structure, which can be cast-in-place or sprayed. The solid concrete outer cladding of steel structure fire-proof cast-in-place is usually reinforced with steel wire mesh or steel bars to limit shrinkage cracks and ensure the strength of the shell. Spraying method can apply sand pump to the surface of the steel structure at the construction site to form a protective layer. The sand pump can be lime cement or gypsum mortar, or it can be mixed with perlite or asbestos. At the same time, the outer cladding can also be made of perlite, asbestos, gypsum or asbestos cement, and light concrete to make prefabricated panels, which are fixed on the steel structure with adhesives, nails, and bolts.

 

3. Shield

The steel structure is set in the wall or ceiling composed of refractory materials, or the components are enclosed in the gap between two walls, and the purpose of fire prevention can be achieved only by adding a little or no refractory materials. This is one of the most economical fire prevention methods.

 

4. Fill with water

Filling the hollow steel structure with water is the most effective protection measure for steel structure fire prevention. This method keeps the steel structure cool during a fire, and water circulates within the steel structure, absorbing heat from the material itself being heated. The heated water can be recirculated after being cooled, or cool water can be piped in to replace the heated water.

The difference between steel structure carport and membrane structure carport

1. The value of landscape design

The carport is a small building, and its shape has attracted people's attention. Due to the particularity of steel, the steel structure carport has a relatively simple shape. The main material of the membrane structure carport is membrane material, the curve is high, and it can be shaped at will according to the designer's imagination.

 

2. Construction management cycle

1. The membrane structure carport is smooth and simple, and can be completed in the processing plant without more processes, and the construction period is short.

2. The steel structure carport requires complex processes such as welding, and the construction period is long.

 

3. Maintenance cost

1. The membrane structure carport uses the membrane material to contact the social air pollution environment, the membrane material will not be corroded by the air, and there is no maintenance and management cost in the later period. the

2. Steel structure carport, the appearance is made of steel, generally painted to prevent corrosion temporarily. Generally, steel will rust in a large area within one or two years, requiring complicated maintenance procedures such as paint removal, rust removal, and painting, and the maintenance cost is high.

 

4. Security

1. The surface of the membrane structure carport is smooth, there will be no snow and rain in large-scale development and stagnation areas, and the weight is light, so there is no need to worry about the risk of collapse.

2. The steel carport is very heavy, and the safety risk of collapse is great.

 

5. Service life

1. Membrane structure carport can be anti-corrosion, generally can be used for 20 years. the

2. The steel structure shed can generally be used for about 10 years.

 

6. Cost

1. Membrane structure carport uses membrane as the main material, which is cost-effective and easy to maintain.

2. The steel structure carport uses steel as the main research material, the process is complicated, the labor cost is high, the maintenance management cost is high, and the comprehensive engineering cost is low.