Deep Drilled Braced Monument Overview
Deep Drilled Braced Monument
The deep drilled braced monument (UNAVCO DDBM*) provides for a high degree of stability and longevity and can be anchored in bedrock or unconsolidated material. It is in the form of a tripod, each leg extending into the ground up to about 40 feet and welded at the top with gusset reinforcements. If site access is an issue and bedrock is available, the short drilled braced monument is the next best alternative to this type. The UNAVCO DDBM is used throughout the PBO network. It is based on the SCIGN design used at older installations in the SCIGN, BARGEN, PBO and PANGA networks.
* Modified from the original SCIGN DDBM design of Duncan Agnew and Frank Wyatt.
Design and Construction
A drilling contractor is required to install this monument. The cost of installation depends upon factors such as the type of drilling rig used, distance the drill rig and crew need to travel to site (mobilization/de-mobilization), foundation material (ground) being drilled, etc.
Depends principally on drilling (substrate, distance drill rig needs to travel to and from the site)
This cost is for the monumentation only; the antenna mount (e.g. SCIGN mount) is not included.
Mount Commonly Used
The SCIGN mount is the antenna mount most commonly used with the deep drilled braced monument, although it is only required when using the SCIGN radome. Otherwise, any other leveling mount, such as the SECO 2072-series antenna mount, is acceptable.
Send questions or comments to Support (supportunavco.org).
|Posted by: Beth Bartel - October 26, 2011. This article has been viewed 2170 times.|
|Online URL: https://kb.unavco.org/article/deep-drilled-braced-monument-overview-300.html|
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