05.11product manualH-4202ADynamic Cone Penetrometer Set
BACKGROUND:The Standard Penetration Test (SPT) has its roots in the empirical observation ofblows per unit measure of driving casing. The SPT method requires mechanizedequipment to raise and drop a 140lb mass 30 in. Numerous methods have beendeveloped to miniaturize the SPT such that hand operated tools could be usedat shallow depths where confined spaces or the need for expedience excludesthe use of a mechanized SPT device.The late Prof. George Sowers developed one of the more popular devices in1959 for field exploration and the evaluation of lightly loaded shallow spreadfootings during the construction phase. For underlying theory the reader isencouraged to consult the following reference: George F. Sowers and Charles S.Hedges. Dynamic Cone for Shallow In-Situ Penetration Testing, Vane Shear andCone Penetrations Resistance Testing of In-Situ Soils, ASTM STP 399, AmericanSociety Testing and Materials, 1966, pg. 29. Copies can be purchased fromHumboldt.The Dynamic Cone Penetrometer (DCP) illustrated in Figure 1a, uses a 15 lbsteel mass falling 20 in. to strike an anvil to penetrate a 1.5 in. diameter 45degree cone that has been seated in the bottom of a hand augered hole. Thedevice has been used extensively in the Southeastern region of the USA andcalibrated with standard SPT results. The original correlations by Sowers areshown in Figure 1b. Of course, similar correlation could be developed for soilsof other regions and of differing geologic derivation.OPERATING INSTRUCTIONS:1. The penetration test is performed in the bottom of a hand augeredhole generally 3 to 6 in. diameter.2. Auger to the desired test depth taking care to remove as much of the bottomcuttings as practical. Use the auger cuttings to identify and visually classifythe soil.WARNING: Handle the Dynamic Cone Penetrometer with care. Do not graspthe E-rod between the pull out anvil and the driving anvil as the 15 lb. slidingweight moves easily along this part of the rod.3. Gently lower the sliding drive hammer, extension rods and drive point tothe bottom of the borehole.4. Making sure the assembly is plumb set the cone 2 in. into the undisturbedbottom of the hole such that the cone is completely embedded.NOTE: Laying a flat straight edge such as a survey stake across the boreholeand marking a beginning reference point will expedite measurements.
5. Maintaining the assembly in a plumb position, drive the cone point l-3/4 in.(44mm) using the ring weight and allowing it to free fall 20 in. (bringing thering weight to the uppermost position against the pullout anvil will assure a20 in. drop). Count and record the number of blows required to achieve l-3/4in. (44mm) penetration.6. If desired, perform a second and third penetration test by driving the coneadditional 3/4 in. (44mm) increments. Beyond three increments the effect ofshaft friction may become apparent.7. Remove the DCP assembly from the borehole taking care not to place handsbetween the anvil and keeping clear of the sliding weight.8. Auger to the next test location and repeat steps) through 7.Experience has shown that the DCP can be effectively used in auger holesto depths of 15 to 20 ft. Beyond these depths it becomes cumbersome tohandle the string of rods by hand. Also, correlations have not been verifiedfor deeper depths where energy losses from thread joints and rod inertiahave not been consideredDrive Tube AccessoryThe Cone and Adapter Rod Assembly can bereplaced with the H-4202.7A Drive Tube Assemblyfor taking 3 x 10" tube, H-4202.10, samplesin augered holes.
Individual Items for H-4202Standard drive hammerH-4202.1Sleeved drive hammerH-4202.1AE drill rod extension 1 ft.H-4202.21 E drill rod extension 2 ft.H-4202.22 E drill rod extension 2.5 ft.H-4202.225 E drill rod extension 5 ft.H-4202.25 Drive point w/1 ft. adapterH-4202.3 Drive point onlyH-4202.3DPAuger assembly, includes auger head, twoconnector pins, tee handle and one extension.H-4202.6AAuger Tee handleAuger Tee handle, stainless steelAuger extension. 36"Auger extension, stainless steel. 36"Auger head, standard Auger head, stainless steel 3-1/4".H-4202.6SSWindowed auger head,standard (heat-treated carbon steel). 3-1/4"H-4202.6WWindowed auger head,standard (stainless steel) 3-1/4"Drive tube assembly, zinc plated steel. 3 x 10"Replacement connector pin.Replacement connector pin, stainless steel.ASTM special technical H-4202.9
WarrantyHumboldt Mfg. Co. warrants its products to be free from defects in material orworkmanship. The exclusive remedy for this warranty is Humboldt Mfg. Co.,factory replacement of any part or parts of such product, for the warranty of thisproduct please refer to Humboldt Mfg. Co. catalog on Terms and Conditionsof Sale. The purchaser is responsible for the transportation charges. HumboldtMfg. Co. shall not be responsible under this warranty if the goods have beenimproperly maintained, installed, operated or the goods have been altered ormodified so as to adversely affect the operation, use performance or durabilityor so as to change their intended use. The Humboldt Mfg. Co. liability underthe warranty contained in this clause is limited to the repair or replacement ofdefective goods and making good, defective workmanship.Humboldt Mfg. Co.875 Tollgate RoadElgin, Illinois 60123 U.S.A.Testing Equipment forU.S.A. Toll Free: 1.800.544.7220Voice: 1.708.456.6300Fax: 1.708.456.0137Email: [email protected] MaterialsHUMBOLDTwww.humboldtmfg.com
Cone Penetrations Resistance Testing of In-Situ Soils, ASTM STP 399, American Society Testing and Materials, 1966, pg. 29. Copies can be purchased from Humboldt. The Dynamic Cone Penetrometer (DCP) illustrated in Figure 1a, uses a 15 lb steel mass falling 20 in. to strike an anvil to penetrate a 1.5 in. diameter 45File Size: 1MB