Abstract
AbstractThe labor and material costs associated with extracting neutron access tubes used for neutron probe soil water determinations can be substantial. Present commercially available access tube extractors are clumsy to use, and can ruin tubes that are being extracted from high clay content soils. To remedy these problems, a new access tube extractor was designed. The extractor slips over the tube to be removed and is secured in place by a threaded collar that provides the initial pressure to hold it in place until the extraction force is applied. As the extractor pulls on the access tube during removal, conically‐tapered jaws exert additional clamping pressure on the tube in greater proportion than the pulling force required to remove the tube. The device easily extracts access tubes against a resistance of up to 13.7 kN (3086 lb.) with no damage to the tubes. Either a mechanical jack or a hydraulic lift on a tractor may be used to extract access tubes.
Published Version
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