Berntsen Survey Markers Installation Instructions Video
Aluminum Survey Markers from Berntsen promotes favorable long-term recognition of the investment in land surveying
Survey markers for rebar with SureGrip plastic insulators ... another first from Berntsen, makes good sense. Fast and easy installation helps you lower costs in the field. Feedback from our customers told us that:
A good rebar cap would not "wobble" when tapped on the rebar. Berntsen's survey markers have a deep hex socket and are orbital forged from 6000 series aluminum ... a better design than a simple tapered "cone" socket, and a significantly stronger aluminum alloy than 99% pure aluminum other manufacturers use for survey caps. The 6000 series aluminum used in Berntsen survey markers is the same alloy family used for the rods in our rotating rod monument system. When rods are driven to refusal, they have to be super tough. So are Berntsen rebar caps.
A good metal survey marker must virtually eliminate dis-similar metal corrosion. Surveyors know that aluminum attached directly to rebar or pipe would loosen in a short period of time. This confirms metallurgical theory. Aluminum is less "noble" than steel, and an electrical current will actually flow from the aluminum (+) to the steel (-). Corrosion will occur in the annode (+) area of this battery like combination of metals in the presence of moisture (air or soil acting like an electrolyte).
Our aluminum material is versatile and resistant to most environmental conditions, however, if the survey markers are intended to be used in high traffic or caustic environments, such as roadways or salty conditions, we highly recommend using bronze survey markers to improve the lifetime of the markers.
Berntsen originated SureGrip insulator technology which effectively isolates the aluminum from the steel and de-forms around the ribs of the rebar. The hex shaped socket fills with the deformed plastic material and the cap is locked on with a super tight compression fit. Great force is required to remove the cap.
How to install Berntsen Survey Markers
Tools: Berntsen suggests these tools to help with your installation.
Pre-Installation: Save time in the field with a little preparation in your shop.
- Cut your rebar to your desired length using a hacksaw or power press.
- Remove any burrs and/or mushrooming on the end that will be receiving the survey marker
- For maximum grip, bevel the end of the rebar that will be receiving the survey marker
Installing the Rebar:
With a felt-tip permanent marker, place a mark about 1½" from the end of the rebar. This mark will be your guide to assure the cap is tightly and completely seated on the rebar.
Drive your rebar to the desired depth. Remember to leave enough rebar to install the survey marker.
Installing the Survey Marker:
To restrict any "sinking" of the rebar into the ground when applying the survey marker, clamp a vice-grip pliers to the rebar at ground level. The handle of the pliers will prevent the rebar from sinking into the soil as you drive on the survey cap.
Some surveyors pre-install the survey marker onto the rebar prior to entering the field and then drive the rebar and marker assembly with a urethane faced dead-blow hammer.
Once you have your rebar and cap to the desired depth your installation is complete.