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21
Table 2.0
- Example Layout Plan
DESCRIPTION
SPECIFICATION
COMMENT
System Configuration (Single or Twin) 18 ft (5.5 m)
Left Side
Platform Length
24 ft (7.3 m)
Mast Distance from Structure
6 in. (152 mm)
Platform Height
100 ft (30.4 m)
Masts [Height (ft)/4.8] (2x for Twin)
100/4.8 = 21 Masts (2x) = 42 Masts
Minimum Ties Needed
[Height (ft)/18 + 1] (2x for Twin)
100/18+1 = 6.6 => 7 (2x) = 14
14 Ties
Climbing Unit
2 qty
Platform Support
2 qty
Base
2 qty
Drill
2 qty
Extension Cords
3 qty
100 ft
(30.5 m)
Power Strip/Splitter
2 qty
LAYOUT PLANNING
SECTION
2
Referring to the layout plan, examine the ground conditions to ensure the surface can
support the intended load of the system. Prepare the base surface for erection, removing
any debris, obstacles, or any other conditions that could lead to injury during erection.
Prepare the bearing areas by leveling and/or compacting the ground surface. Add cribbing
or base plates to properly support the bearing force. (See Table 2.1)
Table 2.1
- Ground Preparation
DESCRIPTION
SPECIFICATION
Maximum System Weight [200 ft Single Mast System with
750 lbs Rated Load (or 841 lbs) + (7 lbs/ft x 200)]
2241 lbs (1016 kg)
*
Surface Area of Base Plate
93 sq in. (600 sq cm)
*
Maximum Ground Pressure on Base (200 ft + 750 lb Load)
24 psi (1.69 kg/sq cm)
*
*
Actual system weight is less for heights less than 200 feet (70 meters). The freestanding system base configurations
would also weigh less.
2.1
Ground Preparation