Key points of grid structure construction

Key points of grid structure construction

1、 The node forms of grid structures include bolt balls, welding balls, etc. The bolt ball is composed of steel balls, high-strength grid bolts, pins, sleeves, cone heads, and sealing plates. Generally produced by professional factories and assembled on-site. The drawing and processing of bolt balls require a series of processes such as plane processing, angle division, drilling, tapping, and inspection. The bolt ball shall be hot forged and formed, and the appearance quality shall not have cracks, wrinkles, or excessive burning. The oxide skin shall be removed.

2、 The welding ball is a hollow sphere, formed by butt welding two hemispheres. Welding balls are divided into two types: non ribbed and ribbed. The important nodes of steel grid structures are generally ribbed welded joints, and the forms of ribs include single ribs, vertical double ribs, and so on. So before assembling the ribbed ball, it should also be ribbed and welded. Note that the height of the ribs should not exceed the inner surface of the ball to avoid affecting assembly.

1. Control the size during the cutting of welding balls and allow for appropriate allowances.

2. The welding ball material is heated to an appropriate temperature of 600-00 in a heating furnace, placed in a semicircular inspection tool, and gradually pressed into a semicircular ball to obtain uniform heating measures. During pressing, the oxide skin should be cleaned in a timely manner, and the semicircular ball should be able to change its position in the mold,

3. After correcting and cutting the half circle ball,

4. After the half round ball is formed, it should be taken out from the tire for cooling. A groove should be made at the connection point, and the half round ball should be corrected with a template, leaving a splicing allowance. The angle and form of the groove should meet the design requirements.

5. When assembling round balls, there should be molds to ensure assembly quality.

6. The welding ball splicing is a full penetration weld seam, and the weld quality level is Level 2. Place the assembled ball on the welding tool, with small holes on each side to fix the ball and slowly rotate it. Rotate the ball once, adjust various welding parameters, and perform multi-layer and multi-pass welding on the welding ball using Bocai welding (or gas shielded welding) until the weld seam is filled flat.

7. The appearance of the weld seam is required to be smooth, without cracks or wrinkles. The weld seam reinforcement meets the requirements. After passing the inspection, ultrasonic testing should be conducted on the steel ball weld seam after 24 hours.