STATIC CONE PENETROMETER
Contents
1. 105 Harrison Street American Falls Idaho 83211 U S A 800 635 7330 208 226 2017 www ams samplers com STATIC CONE PENETROMETER USE AND OPERATING GUIDELINES GENERAL INFORMATION The Static Cone Penetrometer is an unparalleled device for measuring soil consistency It is specifically designed for use in fine grained soft soils to depths as much as 30 feet The basic unit is totally self contained weighs 5 1b and is set up for a 2 ft maximum depth It is intended to be operated by one person and requires no auxiliary equipment The device is extremely rugged and is built for day in day out use Items included Item 1 Head Assembly Item 8 or 11 Outer Inner Rod Assembly Item 18 Cone Assembly S 215 IM User Manual PRACTICAL APPLICATIONS e Rapid Selection of locations for field density tests e Earthwork control for embankments e Evaluating backfills in trenches and behind walls e Muck and soft soil probes e Light foundation investigations e Probing shallow marine deposits e For rapid correlation of field CBR tests e Probing beneath existing shallow foundations e Pavement subgrade evaluation PRACTICAL APPLICATIONS Dual rods enable the cone stress to be measured directly Soil friction on the outer rod does not influence the reading Depending upon the application either the maximum bearing for an increment of push or the least bearing for an increment can be reported If you were investigating for soft spots you wou2. now ready for use Piston O Ring Replacement a Remove the Inner Outer Rod Assembly Item 8 or 11 from the head Assembly Item 1 b Remove the Insert Item 7 from the Head Assembly Note For this procedure you will need a 3 8 16 x 2 long bolt and nut Screw the bolt and nut into the insert and use the nut to jam the bolt this will prevent the bolt from backing out of the Insert Now use the bolt to screw the Insert out of the Head This procedure can be made easier if the Head Assembly is slightly heated at the Insert Leaving the nut and bolt in the Insert will facilitate reassembly c Remove the Adjustment Screw Item 4 and drain the oil from the unit d Using a long screw driver or similar tool press the Piston Item 6 out of the bottom of the Head e Replace the O ring Item 5 being careful not to damage it f Replace the Piston from the bottom of the Head with the drilled hole facing outward CAUTION The Piston must be inserted from the bottom of the Head to prevent damage to the O ring and should not be pushed above the Gauge opening Reinstall the Insert in the bottom of the Head Assembly using the bolt and nut Note Loctite thread fastener is recommended to insure the Insert does not unthread during use Using a long screw driver or similar tool press the Piston from the top or Adjustment Screw end of the Head down against the Insert being careful not to damage the bore
3. 1 Refill the Head with Automatic Transmission oil until flush with the top j Drop in the brass Adjustment Screw and thread clockwise until flush with the top Note Oil will run out during this step preventing air from being trapped inside Screw the Outer Rod Assembly in to the Head Assembly watching the needle of the Gauge If the Gauge needle begins to move back out the Adjustment Screw to allow the excess oil to escape CAUTION Failure to allow excess oil to escape will over pressurize and damage the Gauge 1 Once the Outer Rod Assembly is tight the Adjustment Screw is turned clockwise until the needle on the Gauge begins to move At this time back off the Screw until the Gauge reads zero Ne 8 h Ne k Ne STATIC CONE PENETROMETER PART LIST a includes items 9 amp 10 9 2 ftStarterInmerRod 2 ft Extension Rod Assembly includes items 12 amp 13 Gauge Guard not shown Gauge Assembly not shown 17 O ring Packing Kit not shown includes 2 each of item 5 Helpful Hint Starter Inner Rods are 0 875 longer than the similar looking Extension Inner Rods 1 e 2 ft Starter Inner Rods are 24 875 OAL The Extension Inner Rods are 24 OAL A
4. a situation in which the rods could be bent It is infinitely easier to avoid bending the rod than to straighten the rod Periodically inspect the Cone Assembly If the Cone Assembly has suffered excessive wear it needs to be replaced The original diameter of the Cone is 0 544 When the outer diameter is reduced to a diameter of 0 520 it is recommended that the point be replaced REPAIR AND REPLACEMENT Repair If you notice that your penetrometer is leaking or will not hold pressure you will need to replace the O ring Item 5 on the Adjustment Screw Item 4 and or the piston Item 6 Adjustment Screw O Ring Replacement a Remove the Outer Rod Assembly Item 8 or 11 from the head Assembly Item 1 b Clamp the Head Assembly in a vise with the brass Adjustment Screw pointing up c Remove the Adjusting Screw from the Head Assembly and discard the O ring d Install the new O ring being careful not to damage it e Fill the reservoir with automatic transmission oil until flush with the top f Drop in the Adjustment Screw and thread clockwise until flush with the top Note Oil will run out during this step preventing air from being trapped inside g Screw the Outer Rod Assembly into the Head Assembly h Continue to screw the brass Adjustment Screw clockwise until the needle on the gauge begins to move At this time back off the screw until the gauge reads zero 1 The Static Cone Penetrometer is
5. ield use of the unit Further verification of correlation in your local soil types is essential AMS accepts no liability for the accuracy of the suggested correlations Standard Penetration Strength and Cohesion CBR Value 1 Test N Value Q Unconfined compression kg cm Q 2 5 to 3 3 CBR Q 4 N c Cohesion kg cm Uniform clay and silty clays Q 5 Q Q 10c Clayey Silts Q 10 to 20 Q Q 20 to 40 c Assembly and Adjustment To assemble your Penetrometer screw the Cone Assembly Item 18 into the Outer Inner Rod Assembly Item 8 or 11 and tighten with a wrench Next screw this sub assembly into the Head Assembly Item 1 and tighten with a wrench Check to be sure the system is properly adjusted by pressing the Penetrometer down on to a board or rubber mat The needle on the gauge should move as soon as pressure is applied After pressure is removed the needle should return to zero If the gauge does not respond when force is applied to the Cone turn the brass Adjustment Screw Item 4 in the Head Assembly Item 1 clockwise until the needle moves This is the zero point to the system If the gauge will not return to zero turn the brass Adjustment Screw counter clockwise until the needle returns to zero You should now be ready to use your Static Cone Penetrometer Borehole Preparation Kit Improve effectiveness of geotechnical testing and sampling with a pre bored hole Include
6. ld take the least reading In typical use you would force the cone into the soil 6 inches retract the cone slightly until the gauge reads zero then advance an additional 6 inch increment If you meet with refusal the cone can be removed and the hole opened with a hand auger to permit a continuation of measurements against depth The tool has been designed to allow a maximum force of 250 foot pounds to be applied somewhat more than the average weight of an operator The unit can be operated in a vertical or horizontal position The cone tip has an included angle of 60 The cone has a section area of 1 5cm The maximum total bearing is Q_ is 70 kg cm The penetrometer assembly comes standard with a 2 ft extension Inner Outer Rod assembly Note Starter Inner Rods are 0 875 inch longer than the similar looking Extension Inner Rods 1 e the overall length for the 2 ft Starter Inner Rods is 24 875 in and for the Extension Inner Rods is 24 inches the Starter and Extension Outer Rods have the same length Simple determination of approximate unconfined compression strength standard penetration test N and CBR values can be derived from the cone index HOW TO USE THE CONE INDEX The reading Q_ is in kg cm which is essentially equal to ton ft The cone index Q_ is read directly The correlation between he cone index and soil constants is not absolute Generally the following results have been determined through extensive f
7. s 2 1 4 5 8 regular auger 2 1 4 5 8 planer auger one 1 4 5 8 extension one 1 3 5 8 extension rubber coated cross handle black poly canvas bag Borehole Preparation Kit 400 78 Borehole Preparation Kit Replacement Parts AUGERS 400 08 21 4 Regular Auger 400 53 21 4 Planer Auger EXTENSIONS 408 02 3 Extension 408 03 4 Extension MISCELLANEOUS 406 04 16 Rubber Coated Cross Handle 430 32 4 Signature Poly Canvas Case pee XY AMS S08 105 Harrison Street American Falls Idaho 83211 U S A 800 635 7330 e 208 226 2017 www ams samplers com STATIC CONE PENETROMETER MAINTENANCE REPAIR AND REPLACEMENT MAINTENANCE Your Cone Penetrometer is a ruggedly designed device intended to tolerate a reasonable amount of field abuse The most critical requirement is keeping foreign matter outside the annulus between the Inner and Outer Rods It is recommended that a drop or two of lightweight machine oil be applied frequently to the annulus A schedule of every 2 3 days is recommended if the unit is being used daily The Inner Rod is a surface ground stainless steel rod which will not rust The Outer Rod is made of a high strength alloy steel tubing which is subject to rusting The machine oil will curb that tendency Always make an attempt to apply a normal vertical or in line thrust on the assembly as it 1s pushed into the ground A severe horizontal thrust coupled to a normal vertical thrust could produce
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