Page 265 - Reciprocating Compressors Operation Maintenance

2 SO Reciprocating Compressors: Operation and Maintenance

Method of repairing compressor foundations that are crackad parallel to
FIGURE 4-11. Method of repairing compressor foundations that are cracked
parallel to the crankshaft.

An unfilled or liquid epoxy is now injected into the annular space
around the bolt. Air in the annular space around the bolt is pressed into
the porous concrete as pressure builds. After the annular space has been
filled, injection continues and the crack is injected from the inside out.
This repair method places the concrete in compression. Note that it
would otherwise be in tension. This compressive condition must be over-
come before a crack could possibly develop again and, as a result, the
repaired foundation is usually much stronger than the original founda-
tion. This technique is often used when the concrete in the foundation is
of poor quality.
ANCHOR BOLT REPLACEMENT

When anchor bolt failure is such that complete replacement is neces-
sary, it can be accomplished using techniques consistent with the illustra-
tion in Figure 4-12.
Complete replacement of an anchor bolt is possible without lifting or
regrouting the machine. This is accomplished by drilling large diameter
vertical holes, adjacent to the anchor bolt to be replaced and tangent to
the base of the machine. Once the cores have been removed, access is
gained to concrete surrounding the anchor bolt.
After the surrounding concrete is chipped away, a two-piece and
sleeved anchor bolt is installed. After the replacement anchor bolt has