TABLE OF CONTENTS - Khalid S. Al-Shahrani

8.5. Scaffolding components
8.5.1. Tube
Ordinary scaffold tube is 1 29/32 inches in diameter and is usually referred to
as two-inch tube.
Tubes shall be free form cracks and surface flaws, laminations, excessive rust,
and other defects. The ends shall be cut cleanly and square with the axis of the
tube.
Tube shall not deviate from a straight line by more than 1/600 of its length
measured at the center of its length.
8.5.2 Fitting
All fittings (couplers, clamps etc.) shall be approved type. They shall be
examined regularly and care must be taken to ensure that moving parts of
fittings are sound and well lubricated and that threads are not stripped.
8.5.3 Board
Board shall be of rough timber, minimum 35mm thick and not less than
200mm wide, and shall conform to following specifications:
a) Looking at the face of the board, not more than one-third the width of
the board in any one place shall be knot wood.
b) Looking at the face of the board, the ends shall not be split up more
than 300mm, with the hoop iron fixed or the end bolted through.
c) Looking at the edge of the board, not more than half the depth shall be
knot wood.
d) Looking at the edge of the boards, the grain shall not cross from face to
face in a distance of less than 300mm.
e) Looking along the aboard from one end, the board must not be twisted
by more than 12mm. Board shall not be painted or treated on any way
that may conceal defects.
f) Boards Which are split, decayed or wrapped shall not be used, but the
parts affected may be cut off to procedure shorter boards with the
ends banded or bolted through.
Pre-Qualification Document Khalid S. Al-Shahrani Est. Page 44