INSTALLATION OF FIRE-TEK BEAM AND COLUMN SLAB USING WELDED PIN FIXING SYSTEM

Structural Steel Protection
INSTALLATION OF FIRE-TEK BEAM AND COLUMN SLAB

The Welded Pin Fixing System - Can be used to provide up to 2 hours fire protection structural steelwork.

I and H Section Beams

CD weld nails are fixed along the top and bottom flange toes on both sides of the beam, and in two rows to the underside of the bottom flange via a capacitor discharge welding machine. The nails are located at nominal 800mm centres on the flange tips, and at no more than 110mm from the board ends. Those on the bottom flange are located at a nominal distance of 50mm from the flange edges and at nominal 500mm centres along the length of the beam, and again at no more than 110mm from the board ends.

The beam is clad on three sides with the Fire-teK Beam and Column Slab insulation. The flange face panels are cut to the corresponding width of the beam and the web face panels are cut to the corresponding depth of the beams plus 1x the nominal protection thickness applied. Joints in the panels across the web are offset with respect to those across the bottom flange by a minimum of 750mm. The boards are installed by pushing them over the pins and securing them in place using 38mm-diameter x 0.4mm-thick mid steel disc washers pushed over the weld pins. All board-to-board joints are glued using a suitable thixotrophic mastic adhesive.

Any gaps between the boards and the soffit of the construction above the beam are sealed with intumescent sealant. 

Rectangular and square hollow section beams

This method can also be used to protect rectangular and square hollow steel beams. In this case, the pins are located on each face of the hollow section in pairs, 50mm from the edge of each face. Those on the sides of the beam are located at nominal 800mm centres and those on the bottom face at nominal 500mm centres.