Stainless Steel Pin with Mast Overview
Stainless Steel Pin with Mast
Stainless steel mast designs may vary. In general, they consist of a threaded pin set into bedrock with cement or epoxy, with a threaded mast screwed onto the pin. Throughout the semi-permanent GNSS network in Afar, Ethiopia (E. Calais, Purdue University), pins are ten inches long and masts are 1"-diameter and 0.5m (19.7") long (shown below). The pin is installed as close to vertical as possible; a stainless steel cup with a threaded brass adapter is used for the antenna mount. The cup does not allow for precise leveling but does allow for the antenna to be oriented to north. A dimple on the pin allows the pin to be used as a survey marker should the mast be removed.
Design and Construction
A battery-powered drill is all that is needed for installation of the pin.
Please note: Alternatively, a 8" long SS 5/8" all-tread rod with a SS nut epoxied or welded on to the rod can be substituted for the pin mentioned above.
Similar to the all tread mast but installed flush to the ground. See the article on the all tread rod mast.
This cost is for the monumentation only; the antenna mount is not included.
Mount Commonly Used
A 5/8" threaded leveling mount (cost $150) can be used, but we commonly use a simple non-leveling mount consisting of a stainless steel cup holding a brass adapter. The antenna is screwed onto the brass adapter and can be rotated to north. The adapter is then held in place in the cup with a set screw. The monument itself is installed as close to vertical as possible.
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|Posted by: Beth Bartel - Thu, Feb 18, 2010 at 6:56 PM. This article has been viewed 51554 times.|
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