SHS Jointing, Flowdrill & Hollo-Bolt - Tata Steel

Flowdrill&Hollo-Bolt
Flowdrill &
Hollo-Bolt
Jointing
for Hollow Sections
Flowdrill and Hollo-Bolt give a choice of two
methods to produce bolted joints in
Hollow Sections. Both systems offer the
following benefits:
● They produce bolted joints of structural
capacity in Hot Finished Rectangular Hollow
Sections (HFRHS).
● They minimise the change in the fabrication
process by using connection details which
are standard in the construction industry.
● They reduce fabrication by removing the
need to weld plates or other fittings onto the
outside surface of the RHS.
● They simplify erection by using fully threaded
bolts -an increasing practice in the
construction industry.
● They maintain aesthetics by producing a
flush face on the RHS after fabrication.
Design Guidance
The design guidance produced in this
publication is for Flowdrill and Hollo-Bolt
systems with grade 8.8 bolts in conjunction with
Tubes and Pipes hot finished structural hollow
sections. The design guidance, for joints in
simple construction, result from Tubes & Pipes
initial research work undertaken in connection
with CIDECT (Ref. 1). The guidance
complements the information published by the
BCSA/SCI and is presented in a form
compatible with their publication “Joints in
Simple Construction” (Ref. 2).
Further test work is being undertaken to
establish design guidance for semi-rigid
joints.
Procedural checks are given for bearing, shear
and local bolt pull out of the RHS wall and for
the combined effect of the column axial load
and the structural integrity tensile load of
BS 5950 : Part 1.
The combined check for the column axial load
and the structural integrity tensile load
recognises that the flexibility of the RHS face
caused by the tensile load can, in the presence
of the column axial load, reduce the overall joint
capacity.