But it is the increased flexibility in the selection of resin anchors that has meant that, in most applications where loads need to be transferred into restricted sections of concrete or via a base plate of restricted dimensions, a resin system will provide a solution where a mechanical anchor, either expansion or undercut, just won’t.
As to their ‘Pros’ mechanical anchors are usually cheaper as an installed fixing than chemicals; they are far less sensitive to poor installer technique; they can be loaded immediately; and some of them (throughbolts and sleeve anchors) may usefully be fixed through the clearance holes in the fixture – whereas most resin anchors require larger clearance holes to facilitate this.
The curing time is the other bugbear of resin anchors whereas mechanical anchors may be loaded immediately.So we’ve established that resin systems can be stronger, work at closer edge and spacing dimensions, and offer a solution for masonry. However, best practice has, until recently, dictated that holes for resin anchors should always be thoroughly cleaned out using a process of both blowing (or vacuuming), brushing and blowing.
Chemical anchors (I prefer the simpler term ‘resin anchors’) exert no setting stresses in the base material so can be specified at closer edge and spacing distances in concrete and will usually develop the strongest anchorage in masonry materials – which are their main ‘Pros’. The closest mechanical anchors get to this degree of flexibility is that many types of throughbolt are available in a variety of lengths – catering not just for different fixture thicknesses, but for different embedment depths and therefore loads as well.
As to their ‘Pros’ mechanical anchors are usually cheaper as an installed fixing than chemicals; they are far less sensitive to poor installer technique; they can be loaded immediately; and some of them (throughbolts and sleeve anchors) may usefully be fixed through the clearance holes in the fixture – whereas most resin anchors require larger clearance holes to facilitate this.
The curing time is the other bugbear of resin anchors whereas mechanical anchors may be loaded immediately.So we’ve established that resin systems can be stronger, work at closer edge and spacing dimensions, and offer a solution for masonry. However, best practice has, until recently, dictated that holes for resin anchors should always be thoroughly cleaned out using a process of both blowing (or vacuuming), brushing and blowing.
Chemical anchors (I prefer the simpler term ‘resin anchors’) exert no setting stresses in the base material so can be specified at closer edge and spacing distances in concrete and will usually develop the strongest anchorage in masonry materials – which are their main ‘Pros’. The closest mechanical anchors get to this degree of flexibility is that many types of throughbolt are available in a variety of lengths – catering not just for different fixture thicknesses, but for different embedment depths and therefore loads as well.
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