After cleaning the corroded area and cutting back the
corroded edges, you weld the reinforcing bars to the
flanges and the web. A form is then placed around the
corroded section and filled with concrete. Figure 7-18
shows this procedure for a steel H-pile. The same
system can be used for other structural members.
Sheetpiling usually serves as a bulkhead to retain
earth or other fill. Holes in the bulkhead will result in
loss of materials and settlement behind the bulkhead.
Local damage or holes can be repaired by welding on
plates or more sections of steel sheetpiling. If the holes
are small, wooden plugs can be used to fill the holes.
Usually, it is necessary to install new sheetpiling in the
deteriorated areas; however, it may be economically
feasible to protect the damaged sheetpiling with a
concrete facing, as shown in figure 7-19. Remove all
rust, scale, and marine growth before placing concrete.
Concrete covers, when applied to the exposed exterior
face of the piling, should be at least 6 inches in
thickness and extend well beyond the area of
corrosion, damage, or deterioration. Formwork should
be of wood, supported in place by stud bolts that are
welded to the sheetpiling. Use heavy zinc-coated bolts
and nuts. It is preferable that the wood forms be left in
place because they will provide protection against
damage from floating debris and erosion for some
time. Where the back of the bulkhead can be easily
exposed, it may be advisable to encase the sheetpiling
completely in concrete. Minimum thickness of
concrete facing where the piling is completely encased
in concrete should be 3 inches. Care must be taken in
replacing the backfill when the sheet pile has been
encased. GRANULAR materials are preferable. Fill
should be placed in layers and well compacted.
Tie Rod Repair
Deteriorated tie rods will allow the top of a
bulkhead to move outward. Remove the fill to expose
the tie rods and turnbuckles by starting the excavation
at the back face of the bulkhead, and progress to the
shore in as narrow a trench as possible along the tie
Figure 7-19.Concrete encasement of steel sheet pile.
Figure 7-18.Concrete encasement of steel pile.