MEP-Technical Manual CDN 0408.qxd - Hambro

3.2 FABRICATION
(a) Fabrication shall be in accordance with the Hambro
Shop Standard Practice.
(b) The joist top chord shall be fabricated to allow for
40 mm (1 1 /2”) embedment into the concrete slab.
(c) Provide Hambro joist bottom chord ceiling extensions
unless otherwise noted.
(d) After installation, permissible Hambro joist sweep
shall be 25 mm (1”) in 6 m (20’-0”).
(e) Hambro joists shall be fabricated with an appropriate
camber to suit span and slab thickness. The camber
shall be designed according to the non-composite
dead load.
3.3 QUALITY CONTROL
Joist shall be manufactured in a fabricator’s facility
having a continuous quality control program. The
inspection shall include checking of size, span,
assembly and weld.
PART 4 - EXECUTION
4.1 ERECTION
(a) Installation shall be in accordance with the latest
Installation Manual for the Hambro Composite
Floor System, approved erection drawings and
any amendments which may be issued by the manufacturer.
(b) All joists shall be erected in such a manner so that
they are vertical, level and plumb and at the proper
elevation. Any shimming that may be required shall
be done with metal.
(c) Special conditions requiring top and/or bottom
bracing shall be shown on erection drawings prepared
by supplier.
(d) Welded Wire Fabric - Lapping shall be in accordance
with the provisions of CAN/CSA A23.3-04 and
Hambro construction drawings.
(e) End anchorage - Joist shoes shall be properly
welded, anchored or embedded as per engineer’s or
architect’s drawings.
(f) Concreting Practice
2
1- Do not pour concrete in excess of the slab thickness
stated on the erection drawings.
2- Do not drop large bucket loads in concentrated
areas over Hambro joists. Lightly vibrate concrete.
SPECIFICATIONS
3- Construction joints made parallel to the joists should be
made midway between the joists but never closer than
150 mm (6”) to the top chord. Construction joints made
perpendicular to the joists should be located over the
supporting wall or beam.
4- It is recommended that the following publications be
followed:
(a) CAN/CSA A23.3-04 “Design of Concrete Structures
for Buildings”.
(b) CAN/CSA A23.2-04 “Methods of Test for Concrete”.
(c) CAN/CSA A23.1-04 “Concrete Materials and
Methods of Concrete Construction”.
(g) Stripping - Under normal conditions form work may be
stripped at such time as the concrete has reached a
cylinder strength of 3.5 MPa (500 psi).
(h) Construction Loads
1- Bundles of plywood or roll bars should not be placed
on joist system but rather on supporting walls or
beams.
2- During construction, the minimum non-composite
joist capacity for a 70 mm (2 3 /4”) slab and joist
spacing of 1 251 mm (4’-1 1 /4”) on center, shall be
3.5 kN/m (240 plf). Joists spaced at greater than
1 251 mm (4’-1 1 /4”) on center shall have their noncomposite
capacity adequately increased to carry the
additional load. Construction loads may be applied
when the concrete has reached a cylinder strength of
7 MPa (1000 psi).
(i) Minimum joist bearing shall be as follows:
1- Steel support: 65 mm (2 1 /2”) for 75 mm (3”) shoe
90 mm (3 1 /2”) for 100 mm (4”) shoe.
2- Masonry, concrete, wood and metal stud support:
90 mm (3 1 /2”). Bearing surface of supporting units
to comply with applied shoe end reaction, based
on minimum supplied bearing area of 107 cm 2
(16.6 in. 2 ).