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A23.4-09
©
Canadian Standards Association
November 2009
31 Transportation
31.1
All materials and products shall be satisfactory for delivery before loading. The manufacturer’s procedures
shall indicate how units shall be transported.
Note:
The responsibility for transporting precast elements should be clearly established in the contract documents (see
Annex A
).
31.2
Elements shall be supported and braced during transportation to ensure that they are not subjected to
stresses for which they are not designed.
Notes:
(1)
Significant vibration, impact, and lateral forces occur during transportation.
(2)
Particular care should be taken with slender elements to minimize excessive twisting or whipping. Lateral stability
during transportation should be investigated.
31.3
All precast elements shall be delivered to the site clearly marked in accordance with
Clause 29.5
. The mass
of the unit shall be provided.
Note:
All orientation and identification marks should be located on the element in such a way as to be visible during loading
and unloading.
32 Installation
32.1
Installation procedures or drawings shall include
(a) the installation sequence;
(b) temporary shoring, bracing, supports, and guys; and
(c) the sequence for installation and removal of temporary shoring, bracing, supports, and guys.
Note:
For further information, see PCI MNL-127
.
32.2
All elements shall be installed as shown on the installation drawings to the tolerances specified in
Clause 12
. Precast elements shall be positioned in such a way that cumulative dimensional errors shall not
exceed allowable tolerances.
Note:
For example, a
9 m
long slab adjacent to a
3 m
long slab having a different upward deflection is not considered to
constitute differential camber. Such situations should be addressed through proper installation procedures.
32.3
Elements shall be installed in a sequence that takes into account the actual loading on the building, the
loading on previously installed elements, attachments, weather-sealing, and tolerances. Elements shall not
be stacked temporarily on other elements during installation unless allowance has been made for this in
the design of the elements and the connections.
32.4
Installation shall not impose undue stresses or overloads on the structure, elements, or connections.
Note:
Panels with a large vertical dimension should be designed to be turned in the air using a double-crane hookup.
32.5
Connections and bearings shall be set within specified tolerances (see
Clause 12
and see CSA A23.1).
Elements shall be positioned to avoid any eccentric application of forces not considered in the design.
Note:
It is important that bearing surfaces make proper contact with the supports in accordance with the design criteria;
otherwise, it is possible that the structure will be built with serious structural deficiencies.
Licensed for/Autorisé à Jed Friesen Sold by/vendu par CSA on/le June/18/2015.
~Single user license only. Storage, distribution or use on network prohibited. Permis d'utilisateur simple seulement.
Le stockage, la distribution ou l'utilisation sur le réseau est interdit.