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Micro Piles |
Pressure Grouting |
Rock Anchors |
Permeation Grouting
Soil Nailing |
Compaction Grouting |
Micropiles |
Injection Grouting |
Chemical Grouting
Our
techniques apply when adding new structures:
especially
rock anchor,
microfine cement,
soil nailing,
micropile
installations for
foundation support.
We
specialize in
slope stabilization,
anchors,
permeation grouting,
foundation repair
and support,
grouting,
soil nails,
rock drilling,
micropile installations, and
sinkholes. We
use a
problem-solving approach geotechnical
architecture of buildings, bridges,
water plants, sewage plants, tunnels,
sinkholes,
caisson,
shoring,
underpinning,
agriculture, and
roads
construction. We
are experienced in these applications:
micro piles,
sinkhole repair,
permeation grouting, pressure
grout,
soil nails,
chemical grouting,
micropiles,
compaction grout, and
rock anchors.
Our specialties are
rock anchor,
acrylamide and
compaction grouting,
mini piles,
sinkhole repair,
micropiles,
acrylamide grouting, and
soil nailing.
We will continue to
dedicate ourselves to
excellence,
including
insurance mortgage, in our performance, in our
integrity, and in our relationships with our
customers. We will carefully weigh our
decisions, actions, and results to make sure
that we remain the most trusted name in the
geotechnical contracting industry. Please
visit our website
http://www.rembco.com/.
Add Concrete Construction URL
|
JULY
1997
Footing Foundations
4-22
be made for some non-uniformity such as small pockets and lenses of material having
somewhat different properties).
3) Condition of the foundation bearing surface (undisturbed by excavation operations
and uncontaminated by sloughing and/or entrance of water).
4) Proximity of structures, highways, railroads, and other facilities which may require
shoring or underpinning.
5) Forms conform with layout, depth, dimensions, and pour grade of plans. Forms are
mortar tight.
6) Reinforcing steel firmly and securely tied in place, shear steel hooked to both top and
bottom rebar mats and securely tied. Proper concrete cover over top rebar mat (2 inch
minimum rebar clearance to wood forms, 3 inch minimum for neat formed excava-
tion).
7) Concrete placing operations: proper mix number, truck revolutions, back-up alarm,
concrete temperature. Wet down rebar and forms, do not allow concrete to drop over 8
feet, reconsolidate and finish top one foot of concrete no sooner than 15 minutes after
initial screeding, then cure.
Footing forms are either built-up or consist of prefabricated panels. The forms are generally
secured at the bottom by stakes, horizontal kickers or ties and are externally braced, tied or
strapped at the top. If the forms extend above the top of footing elevation, a pour strip or
similar device must be attached to the forms to designate the top of footing elevation.
Often, the footings are excavated “neat,” (excavated to the footing dimensions) and the
concrete placed against the sides of the excavation, eliminating the need for footing forms.
Top of footing grades must be clearly delineated with stakes or flagged spikes driven into the
sides of the excavation. A bench of sufficient width to prevent sloughing or cave-in should
be provided around the excavation for access and work area. Ensure that “neat” excava-
tions conform to the planned footing dimensions, or if not, place the exact footing dimen-
sions as constructed on the “As-Built” drawings. On recent seismic retrofit projects, several
costly Contract Change Orders have had to be written to correct past undocumented footing
overpours.
Whether footings are formed or excavated “neat”, a template should be constructed for
positioning vertical reinforcing steel cast in the footing to prevent displacement of the
vertical rebar during the pour.