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A HYDRAULIC CORING SYSTEM FOR SOIL–ROOT STUDIES

^a USDA-ARS Natl. Soil Dynamics Lab., 411 South Donahue Drive, Auburn, AL 36832
^b USDA-ARS, Natl. Program Staff, 5601 Sunnyside Ave., Beltsville MD 20705

View larger version (108K): [in a new window]   Fig. 1. Photograph of soil-coring system (fully extended position) getting ready to insert small-diameter core tube: (A) outer pipe section, (B) hydraulic post driver (ports visible at top right side of post driver), (C) slots in outer pipe section allowing passage of inner pipe mounting brackets, (D) support structure (with bottom braces) connected to the inner pipe section and bumper unit, (E) lock pin which holds driving head in bore of post driver, (F) inner pipe section (housing hydraulic cylinder) connected to bumper unit, (G) small-diameter core tube, (H) hoses for hydraulic cylinder passing through hole in inner pipe section, (I) insert showing system in fully retracted position (note that screwdriver has been inserted through core tube and driving head before extraction), (J) insert showing starting position for insertion of large core tube, and (K) insert showing extraction of large core tube.

View larger version (22K): [in a new window]   Fig. 2. Schematic of soil-coring system mounted to the front end of a small tractor: (A) outer pipe section, (B) inner pipe section, (C) hydraulic cylinder housed by inner pipe section, (D) post driver, (E) support structure, (F) post driver (front view), and (G) machined slot for operational clearance of support structure. Detailed views of X-X, Y-Y, and Z-Z are shown in Fig. 3.

View larger version (16K): [in a new window]   Fig. 3. Schematics of detailed views referenced in Fig. 2. Component parts are (A) post driver top mount, (B) hydraulic ports (fitted to universal agricultural quick couplers), (C) inner pipe mounting bracket (flat bar parts welded to inner pipe section and bolted to tractor bumper unit), (D) post driver (front view), (E) detent for drive adaptor lock pin, (F) post driver bottom mount, and (G) upper mount connecting inner pipe section to support structure.

View larger version (21K): [in a new window]   Fig. 4. Schematics of driving head, core tubes, and extractor collar: (A) driving head used for small core tubes and with Extension B for large core tubes, (B) driving head extension for large core tube, (C) collar with chain for extracting large core tubes, (D) large core tube, and (E) small core tube.