General Notes
- All dimensions are shown in feet and inches (and millimeters)
and (reference).
- Contractor shall field verify all dimensions locating existing
construction before fabrication of new construction begins.
- Concrete and related work shall be mixed, placed and
cured in accordance with the "Building Code Requirements
for Reinforced Concrete" ACI 318-86 (Rev 88) and "Specifications
for Structural Concrete" ACI 301-84 (Rev 88) publication
SP-15 (88).
- Concrete for foundations shall develop a minimum compressive
strength of 3000 psi (211 kgf/cm2) in 28 days with a
maximum slump of 3 inches (76 mm) at time of placing.
- Reinforcing bars shall conform to ASTM A615 (S1) grade 60
deformed type Fy = 60,000 psi (4,219 kgf/cm2).
- Unless otherwise noted, concrete cover for reinforcing bars
shall conform to the minimum requirements of ACI 318-89
(Rev 88).
- Fabrication of reinforcing steel shall be in accordance with
the "Manual of Standard Practice for Detailing Reinforced
Concrete Structures" ACI 315-80 (Rev 86).
- Provide 3/4" x 45" (19 mm x 45") chamfer on all exposed
concrete edges.
- Plans are to be designed by a registered professional engineer
for depth type and reinforcement for the following loads:
| Pier 1 |
17.6K (Down) |
-12.5K (Uplift) |
| Pier 2 |
17.5K (Down) |
-15.0K (Uplift) |
| Pier 3 |
13.9K (Down) |
-18.6K (Uplift) |
- The excavation and base flare are to be made with an auger
and the piers are to be cast against undisturbed soil.
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- Foaming is required for any above ground concreting.
- Backfills shall be suitable excavated material or other
suitable material compacted in 6" lifts to 90% of maximum
density as determined by ASTM D1557.
- Ground rods shall be driven to depths as shown (below
permanent moisture level) and ground system resistance
measured. The antenna system consisting of a number of
interconnected ground rods. The system shall meet the
standards of the Underwriters' Laboratories Publication
No. UL96A for lightning protection. The ground rod
system-to-earth resistance shall not exceed 1.0 Ohm at
any time during the year.
- Grounding system shown is the minimum necessary. Local
conditions will dictate grounding system design.
- This foundation is a typical design only. Certification of its
suitability for a particular installation by a Professional
Engineer is required prior to its use for Actual Fabrication.
- A Tolerance of ±1/8" (3 mm) applies to all anchor bolt layout
dimensions.
- Level all shear caps individually and to within ±1/4" (6 mm)
of each other.
- This alternate foundation plan may be required in lieu of the
footing foundation if space is limited or the soils are active
and may heave or settle excessively.
Foundation Layout - Pier
5.6-Metre Earth Station Antenna
Figure 4
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