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Permanent GPS Stations - Monumentation - Pillar Type Monument
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Pillar Type Monuments
These are simple monuments typically consisting of reinforced concrete set within a tubular concrete form. The leveling mount and GPS antenna are secured to a stainless steel pin which is anchored within the top of the pillar. The foundation of the pillar can be coupled to exposed bedrock or be a larger mass of concrete set within a pit in soil. The pillar's ultimate design may vary depending upon availability of building materials, location, site conditions, and project requirements. It is generally simple and easy to construct and can be used just about anywhere. The building materials are commonplace worldwide and typically very inexpensive.
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Pros:
- Can be very inexpensive
- Materials and tools required are widely available
- Easy to construct (varies with design)
- Can be installed upon bedrock or in unconsolidated material
Cons:
- Concrete can degrade over time through freeze-thaw action
- Weight of concrete mass can settle in certain unconsolidated
materials over time
- Probably does not provide the long-term stability of a drilled-braced
type monument
Design and Construction
Examples:
Required Materials, Tools, etc.
The following is a basic list of materials and tools needed for a very basic pillar design. More complex pillars may require additional tools and materials.
- concrete
- rebar
- water
- sono tube (concrete form)
- stainless steel monument pin with
machined grooves and 5/8" thread for antenna
- shovel and pickaxe
- concrete mixer
- hacksaw (for cutting rebar)
Last modified Thursday, 17-Nov-2005 03:57:00 UTC
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