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 at least 3000 psi (211 kgf/cm2) in 28 days with a
maximum slump of 3" (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.
- Foundations have been designed to rest on undisturbed soil
(per EIA-411-A and RS-222-D) with a minimum allowable
net vertical bearing capacity of 2000 psi (9770 kgf/m2.
If undesirable soil conditions are encountered, the Engineer shall
be notified.
- Backfills shall be suitable excavated material or other suitable
material compacted in 6" lifts to 90% of maximum density
as determined by ASTM D1557.
Volume of Concrete 24.5 Cubic Yards
(18.73 Cubic Metres)
Weight of Reinforcing .843 Tons
(764 Kilograms)
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- Ground rods shall be driven to depths as shown (below
permanent moisture level) and ground system resistance
measured. The antenna system shall be connected to a
grounding 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.
- If this foundation is to be located in an area where the
annual frost penetration depth exceeds 15" (381 mm), the local
building code specifying a minimum required foundation
depth should be consulted.
- 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.
- For electrical power to antenna, 1-1/2" to 2-1/2" size conduit
recommended. Type and depth to bury conduit to be determined
by customer, in compliance with local codes. Direction
to route conduit to be determined by location of
communications building/shelter. Conduit to extend 6"
(minimum) above surface of foundation slab. Open ends of conduit
to be sealed to prevent moisture and foreign particle
contamination.
- IFL conduit required if no other means for routine cables are
provided.
- For routing IFL cables, 4" size conduit recommended. Type
and depth to bury conduit to be determined by customer, in
compliance with local codes. Location of conduit on foundation
and direction to route conduit to be determined by location
by of communications building/shelter. Conduit to extend
36" (minimum) above surface of foundation slab. All bends
to be large radius, maximum of two bends per run. Open
ends of conduit to be sealed to prevent moisture and foreign
particle contamination.
Foundation Layout - Slab
7.6-Metre Earth Station Antenna
Figure 3
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