Construction and installation technical frame of light steel structure in building(II)

 (2) Connection and installation between beams and columns

The middle column of multi-span portal steel structure needs to be designed according to the swing column, but in the actual construction process, the inclined beam and the middle column are welded tightly, which leads to the actual construction is not in line with the design drawings, and it is easy to cause construction accidents. Therefore, the construction personnel need to carry out construction in strict accordance with the design drawings.

When the flange plate is welded on the thickened or widened connection plate, it is not made into an excessively inclined style according to the construction requirements. For welded joints, if the thickness or width of the member is not the same, and the difference distance on the side of the same direction reaches more than 4 mm, it should be made from the same side of the width or thickness of the tilt Angle is not greater than 1:4.

Because the cutting of the construction personnel is not smooth enough, resulting in the joint of the top plate surface is rough, or improper operation when welding with the edge of the beam and column, making the shape of the top plate bending and deformation, resulting in the contact between the top plate surface is not consistent, the connected bolt can not bear a certain force load, resulting in the joint position can not withstand tensile bending and other specific properties.

When welding steel frame beams and columns, the joints of two bottom plates are placed on the same horizontal section, which is easy to cause safety hazards. When welding joints, the joints of the two baseplates should be staggered a certain distance according to the construction regulations.

When the steel frame beam and column are welded, the corresponding stiffening equipment is not set at the joint of the load borne, which is easy to lead to the phenomenon of the compression of the building structure and its local imbalance.

In the specific construction, the connection bolts do not meet the relevant regulations of building construction, and should be strengthened and tightened repeatedly at the nodes of large structures. The tightening work should be completed on the same day, and the final screwing link cannot be omitted. After the installation of the structure is complete, the construction personnel need to carefully check the connected bolts to avoid missing or loose phenomena.

Some construction projects lack some professional suspended ceiling schemes. If temporary measures are not taken to ensure the stability of the steel frame in the initial stage of the suspended steel frame, it will cause the collapse of the steel frame. The column near the wall should be installed first, and then the other steel frames should be installed.

(3) Installation of purlins and supports

In order to ensure the smooth installation, the purlin can be lengthened, because the role of purlins is not only used to support the components of the wall panel, but also can play a supporting role in the beam and column of the steel frame, which can reduce the calculated length of the steel frame and can straighten the stability of the steel frame. If the purlin holes are too large, it will lose its due function.

In the connection with the steel beam, when the steel frame is subjected to external pressure, it will cause the local loss of stability of the steel beam.