(Temporary Fixing Inserts for As-Cast Element Tolerances)
INTRODUCTION:
To ensure proper alignment and structural efficiency in the handling and installation of prefabricated concrete elements by placing temporary fixing inserts within the allowable as-cast dimensional tolerances as specified in Australian Standard AS 3850.2:2015.
Inserts for the temporary attaching of prefabricated concrete elements shall be placed within the nominal dimensional tolerances provided by the as-cast state, in order that there is proper alignment and structural efficiency for handling and installation.
INSERT LOCATION TOLERANCES FROM A SPECIFIED POSITION
| TYPE OF INSERT | TOLERANCE, mm |
| Face lifting Bracing Strongback Edge-lifting Longitude Thickness | ±20 ±50 ±5 ±5 ±20 ±5 |
The temporary elements are only used for demoulding, transport, erection.
Once the panel shop drawing is issued for construction (IFC), the manufacturing process begins.
However, the elements may not exactly match the shop drawing dimensions due to factors such as concrete pouring and vibration.
These factors can lead to dimensional variations. In Australia, precast concrete manufacturing follows the standard AS 3850.2:2015, which provides insert location tolerances relative to the specified position.
(For Example):
This is the actual dimension of the Edge lifter
This shop drawing is for IFC; after that, it will be used for the manufacturing process.
(For Example):
The edge lifter dimension after curing:
After curing, the edge lifter dimension is acceptable with a tolerance of ±5 mm, as specified in the Australian Standard AS 3850.2:2015 (refer to Table 2.7)
Leave a Reply