Spherical Nodes

Spherical Nodes

In a space frame, spherical nodes (sometimes called a ball joint, ball node, or ball hub) is a solid steel sphere that serves as the central connection point for multiple tubular members in three dimensions. It allows the frame to achieve high strength, stiffness, and geometric flexibility.

Key Features

1. Shape & Material

   • Typically a precision-machined steel sphere (often Q235, Q345, or equivalent grades)

   • Diameter ranges from 60 mm to 300 mm depending on design loads.

2. Connection Method

   • Members are connected via high-strength bolts that screw into tapered threaded holes in the spherical node.

   • The bolts pass through conical sleeves or welded cones at the ends of space frame pipes.

3. Load Transfer

   • Transfers axial, shear, and bending forces between members in all directions.

   • Distributes loads efficiently due to the 3D geometry.

Advantages

• High structural rigidity due to 3D triangulation.

• Flexible geometry — can connect members at various angles.

• Fast assembly — no on-site welding, mostly bolted connections.

• Aesthetic — often used in airports, stadiums, exhibition halls for both strength and design appeal.

Manufacturing Process

1. Cutting and forging the steel sphere blank.

2. CNC machining to precise spherical shape.

3. Drilling and tapping holes at specified angles.

4. Surface treatment — galvanizing, epoxy coating, or painting.

Typical Applications

• Stadium roofs

• Airport terminals

• Exhibition centers

• Industrial warehouses

• Atriums and skylights

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