Injectors from the Compressed Rubber group lock within the drill
hole by mechanically compressing a rubber cylinder around a hollow
threaded shaft. These injectors are available with different shaft
lengths, allowing for the injector to seat at varying depths below
the surface. This design makes these Resi-Mizers particularly effective
in "punky" concrete or surfaces which have been weakened by chemical
attack or in layered surfaces like Shotcrete, Gunite, or Shale.
The 5/8" hole size is the oldest and most commonly
used. However, smaller diameter drill holes may sometimes be desirable
because smaller holes are quicker to drill and take out less concrete.
Small diameter injectors are subject to depth limitations because
of bit diameter-vs-length constraints. As the bit diameter becomes
smaller, the maximum length of the bit must become shorter. Thus,
short and small bits may be easier to use but somewhat more likely
to miss intersection with the targeted crack.
For large injectors in drilled holes sizes of
1.0" to 2.0", Strata Tech has the Twist-Lok Injector series.
Resi-Mizer Injectors in the Compressed Rubber
group are the oldest design type and have certain advantages which
cause them to be chosen often for some applications. The Compressed
Rubber design is quite reliable. It seals quickly and tightly even
at gauge pressures of several thousand psi. Though not the lease
expensive type, it is relatively inexpensive and may be discarded
after only on use.