Anchor Bolts
There are the several options for holding down bolt placement, soleplate levelling and grouting. The choice of the most appropriate can have a significant impact on the cost and ease of installation. Gantrail prepare proposal drawings with many quotations based on their knowledge of the application. However local conditions may make alternative solutions more appropriate. We have a large number of standard drawings that are also available on request. Alternatively, cost savings may be achieved using different procedures and details on site. This note shows some options and identifies some of the advantages and disadvantages.
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Holding down bolt levelling options
J-bolt or deformed bar cast into concrete
Cheap materials
Reduced positional accuracy
Soleplates may not fit over bolts
Angle cut bar threaded into drilled hole
Very accurate
Soleplate holes can be used as template
May hit reinforcement on drilling
Void formed on casting
Gantrail sell specialised void forming tubes
Economic with cement based grout
Expensive to fill with epoxy/poly grout
Cast into proprietary removal bolt sleeve
Tolerant to inaccuracies
High strength with simplicity
Complicated formwork to hold dummy soleplate
Notched soleplate, cover plate then drill bolt holes
Position can be changed on site if reinforcement struck
More parts and operations
Welders may not be available during fitting
Zinc must be removed before welding to galvanised plates
Threaded bar cast in threaded sleeve
Easier re-levelling and lifting of soleplate
Caters for settlement
Difficulty to ensure accuracy
More parts/expense
Levelling
Levelling screw through welded nut
Cheap and easy to use
Nuts often removed during transit
Can become a load path
Can become bonded to grout
Levelling nut under soleplate
Low material cost (+1 nut/washer)
No need to remove levelling screws
Sometimes cannot access nut in trench
Fibre washer must be used before grouting
Drilled and tapped soleplate
Easy to use on site
No increase in soleplate dimensions
Expensive to drill and tap
Set screws must be removed for bolt tightening
Set screws often bond to grout
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