Shallow Braced (non-drilled, hand augered or pounded) Monument Overview


Shallow Braced (non-drilled,hand augered) Monument

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Mount Commonly Used
Stability
Cost
Install Time
Labor
Substrate
Site Impact

SCIGN mount

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$800

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2-3
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The shallow braced (non-drilled, hand augured or pounnded) monument consists of 4-5 1"-diameter stainless steel legs in a tripod configuration pounded into the substrate up to depths of about 5-6 feet. The legs are welded together at the top. The short braced monument is nearly identical to the shallow drilled braced monument, with the exception that the legs are either pounded into unconsolidated ground  or a hand auger is used to create the holes for the legs.

Rather than epoxied into holes drilled in bedrock. Use the SBM (Short Braced Monument) at locations where there is no bedrock available.

  laugered_monument_final.png
Site P492 of EarthScope’s Plate Boundary Observatory (PBO) (left); test site NWOT on Niwot Ridge (middle) and ,Costa Rica   (right).

Pros

Cons

Design and Construction

A heavy duty hammer drill with a special chuck is required for installation.

Documents

Installation Photos

Ed Arnitz of UNAVCO drives the central rod into the ground with a Hilti drill.

The rods can also be pounded into the ground with a sledgehammer.

You first need to make the ends pointed.

sdbm_auger.png

Victor Gonzales (OVSICORI) using the hand auger to dig out the holes for the legs.

 

Approximate Cost

$800

This cost is for the monumentation only; the antenna mount (e.g. SCIGN mount) is not included.

Materials

The materials specific to construction of the SBM are available as a kit which can be purchased from:

Tools

Mount Commonly Used

The SCIGN mount is the antenna mount most commonly used with the shallow 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.

Other Links

Send questions or comments to Support (supportunavco.org).



Article ID: 323
Created: April 9, 2014
Last Updated: April 28, 2017
Author: Beth Bartel

Online URL: https://kb.unavco.org/article/shallow-braced-non-drilled-hand-augered-or-pounded-monument-overview-323.html