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ROCTEST TEXAM Instruction Manual Download Page 7

E1001A-171107                                                                                                                                           

6 

4 

USING THE DP BOX 

4.1  DESCRIPTION 

 

 

DP BOX communicating with a tablet by Bluetooth 

 

The  DP  BOX  is  designed  for  reading  and  logging  measurements  obtained  from 
pressuremeters  and  dilatometers  manufactured  by  Roctest  (including  models  DMP  95, 
TEXAM

E

 and PROBEX). Thanks to the Bluetooth communication feature and to the DP 

Box  READER  Application,  the  DP  Box  can  be  used  in  conjunction  with  a  Tablet  for 
reading the sensors, for configuring a calibration or a testing session, for visualizing and 
logging the test results in real time, and for reviewing any test data. These test data can 
be  uploaded  to  a  laptop  via  USB  communication.  The  DP  Box  comes  in  a  convenient 
water proof enclosure and is fitted with two 12-V rechargeable batteries providing over 8 
hours of autonomy in normal conditions. The DP Box also comes with cable universal AC 
wall plug with US/Euro a adapter cable for car (lighter) and for external battery. 
The  battery  can  be  charged  every  night.  A  charging  circuit  inside  the  readout  limits 
charge time to a certain level. 

The  front  panel  is  splash  proof  allowing  the  use  the  equipment  in  wet  conditions. 
However  do  not  let  the  readout  with  the  cover  lifted  up  under  the  rain  over  extended 
period of time, otherwise water could get into the unit. 

The DP Box is compatible with Android-based tablet model. 

 

 

 

 

 

 

Summary of Contents for TEXAM

Page 1: ... potentially dangerous The Company makes no warranty as to the information furnished in this manual and assumes no liability for damages resulting from the installation or use of this product The information herein is subject to change without notification Tel 1 450 465 1113 1 877 ROCTEST USA Canada 33 1 64 06 40 80 Europe www roctest com www telemac com E1001A 171107 ...

Page 2: ...3 Saturating the tubing probe assembly 16 6 CALIBRATION 16 6 1 Calibration for pressure correction 16 6 2 Calibration for volume correction 17 7 TEST EXECUTION 17 7 1 Making of the borehole 17 7 2 Initial readings 17 7 3 Strain controlled test 18 7 4 Stress controlled test 19 8 PROBE DISASSEMBLY AND ASSEMBLY 19 9 TRANSPORT 22 10 LIMITATIONS OF USE 22 10 1 Cold temperature 22 10 2 Soft material 22 ...

Page 3: ...g the method that will produce the least disturbance to the test material with the tightest hole possible Once in place the probe is submitted to equal increments of increasing volume or pressure and the pressure volume data is plotted The graph below shows a typical curve obtained from a pressuremeter test The curve can be divided into three parts The first portion of the curve corresponds to the...

Page 4: ...gh precision digital gauge mounted on a quick coupler and vent valve assembly e A 70 mm diameter probe or a 44 mm probe for use in a slotted casing The probe consists of a cylindrical metallic body covered with an inflatable rubber sheath protected or not with metallic strips f The high pressure black tubing also called Tecalan g A steel pipe for calibrating the probe not included h One Readout Bo...

Page 5: ...andle b Screw jack actuator c Hexagonal Nut 4 d Washer 4 e Knurled Nut f 8 32 Flat Head Screw 4 g Volume Counter optional h Handle i Support Column 4 j Control Box Please see the appendix for additional components descriptions a b c d e f g h i j ...

Page 6: ...r 5 Make sure volume and pressure transducers read properly Refer to section below on how to use the DP Box Note that volume readings obtained from the electrical sensor must prevail over the one displayed by the mechanical volume counter See section 13 for more details 6 Place the small crank handle h on the crank shaft of the actuator Turn the handle counter clockwise to bring the actuator screw...

Page 7: ...test data These test data can be uploaded to a laptop via USB communication The DP Box comes in a convenient water proof enclosure and is fitted with two 12 V rechargeable batteries providing over 8 hours of autonomy in normal conditions The DP Box also comes with cable universal AC wall plug with US Euro adapter adapter cable for car lighter and for external battery The battery can be charged eve...

Page 8: ...Application should be installed on a Tablet This application can be downloaded from Roctest web site 4 3 CONNECTING AND TURNING ON THE DP BOX Connect the electrical cable of the testing equipment to the DP Box Turn on the DP Box The LED on the front panel will then blink Turn on the Tablet Go in the Tablet Setup and make sure that the DP Box is available and paired with the Tablet Set up the Table...

Page 9: ...DP Box and the Tablet which will be confirmed when the DP box LED will blink quicker see below for more information 4 4 USING THE DP BOX READER APPS The DP Box Application allows configuring the unit to read and to log the data and to review the results 4 4 1 MAIN MENU Main menu of the applications includes the following elements ...

Page 10: ...DP BOX which takes a few seconds The name of the DP Box will then replace the Scanning inscription Used for configuring and running a testing session Used for configuring and running a calibration session Used for viewing readings Used for Establishing Bluetooth communication Selecting an Instrument Type TEXAM DMP PROBEX Selecting the units Setting Date and Time And for Quick Readings of the Senso...

Page 11: ...ent Add a New Instrument and Select the Type of instrument TEXAM and enter the serial number appearing on the control unit e g 001A17003 The DP Box name should appear here Select for additional functions Editing deleting instruments ...

Page 12: ...cessary Go in Quick Readings and press the green icon for reading the sensors Two types of calibrations can be done one with the probe unconfined Pressure Loss Calibration and one with the probe confined Volume Loss Calibration See next section for more details For configuring a calibration go to Calibration and Select the type of calibration Select a probe by giving a serial number generally indi...

Page 13: ...itial readings the operator should press Start for starting the timer Readings will be recorded when timer gets to 0 second Then the operator can increase the volume or pressure to the first step and then press Start for starting the timer and so on until completing the test When the calibration or test is over press on For starting the timer Readings are automatically recorded each time timer get...

Page 14: ... imperative to maintain the ends of the tubings submerged during the saturation Otherwise air will enter the TEXAMe You may tape the tubings to the bottle for ensuring that 3 Set valve No 6 on FILL 4 Turn the small crank handle clockwise to bring the cylinder piston to its uppermost position corresponding to about 1732 cc on the counter The uppermost position is reached when resistance is felt whe...

Page 15: ...wise to expel any air that may have accumulated at the top of the cylinder During this operation watch closely to see that all entrapped air is evacuated and only bubble free water is flowing into the bottle by the tubing connected on the port No 1 10 Return the instrument to the vertical and disconnect tubing from the port No 1 11 Connect the hose to port No 3 12 Turn the crank until water comes ...

Page 16: ... is more than 15 cc the instrument is not completely saturated Repeat the saturation procedure described in steps 4 1 7 to step 4 1 15 The instrument is completely saturated when the volume indicates less than 15 cc at 2 500 kPa Having determined that the instrument is completely saturated rotate the large crank handle until the pressure reaches 10 000 kPa The pressure should stabilize after 2 min...

Page 17: ...n tubing from port No 1 Refill the cylinder by placing valve No 6 on FILL and returning the piston to its lowermost position Wait a few seconds 6 Repeat step 4 2 as a final check on the saturation of the unit 7 Disconnect the tubing from port No 4 8 The instrument is ready to be calibrated The instrument probe and tubing can be saturated in advance and transported to the site ready for testing 6 C...

Page 18: ... least 5 seconds prior to recording readings Record volume and pressure after 60 seconds 5 Install the large crank handle 6 Increase pressure by another 500 kPa step and take readings after 60 seconds as described above Repeat this procedure to 6 000 kPa 7 When tests in very hard material are to be done where it is expected to exceed 6 000 kPa during the test follow the same calibration procedure ...

Page 19: ...ts typically for determining the limit pressure with a satisfactory accuracy typically between 1000 to 1200 cc for an NL probe b or when risk of bursting the probe is high see chart at the end of this manual 3 It is possible and suggested to carry on an unload reload cycle in the pseudo elastic zone i e between Pf creep pressure and Po in situ horizontal earth pressure This cycle can be performed ...

Page 20: ...an be estimated with the following relation Pressure step bar N blow per foot 20 Example if N 17 start with a 0 5 bar pressure increment Check delta V 60 sec 30 sec cc at each step in order to determine if you are in the pseudo elastic zone or in the yielding zone The first zone is characterized by rather constant delta V The second zone is characterized by increasing delta V If you still are in t...

Page 21: ...tly fixed to the bench vice 7 Do not grease the o ring Slide a metallic sheath on the probe s body Make sure the electrical tape on each end of the sheath has been removed 8 Place the second o rind at the other end of the probe Make sure the sheath is centered and that both o rings are at their place 9 Make sure that the metallic strips are not twisted 10 Put hose clamps over the sheath Pay attent...

Page 22: ...t the brass knurled nut in place and screw it This will push the yellow ring inward Proceed until three threads can be seen 14 Free the probe from the vice and from the vice adaptor then reinstall it on the vice but on its other end 15 Make sure that the metallic strips are still straight Put the yellow ring and knurled nut on this end of the probe 16 Using a strap wrench keep on tightening the kn...

Page 23: ...w temperatures will significantly increase viscosity of the liquid which means that time required for inflating and deflating the probe will significantly increase too A 50 50 solution of water ethylene glycol by volume will allow using the equipment at about 25 C a 70 30 solution can be used down to about 10 C It is very important to flush the unit with clean water as often as possible to protect...

Page 24: ... for performing tests at great depth over 100 m provided the borehole is filled with fluid 11 RECOMMENDATIONS Do not wait until the last minute to verify and calibrate the equipment On site keep different sizes of drilling bits and two complete probes to speed up testing On remote sites bring a bench vise for membrane replacement Check data as test proceeds The shelf life of sheaths is 2 years The...

Page 25: ...er saturating the pressuremeter put it under pressure up to 10 000 kPa and check for leaks If the filter leaks tighten up the nuts or put a new filter assembly 12 3 SPLICING THE TECALAN TUBING 1 Cut the tubing at a right angle cleanly 2 Install a socket in a vice Do not overtighten do not misshape the socket 3 Screw the tubing into the socket thoroughly by rotating counter clockwise Then unscrew o...

Page 26: ...ith a volume correction factor c given by the following equation c a b The correction factor a is calculated from the linear part of the curve of the calibration in the steel tube The b parameter takes into account the expansion of the steel tube during the calibration and is calculated with following equation b 2V r e 1 m Em e Where V Volume of the probe when in contact with the metallic calibrat...

Page 27: ...to Vo plus twice the volume injected in order that the probe contacts the walls of the borehole The recommended procedure to obtain PL is to estimate it on the manually extended pressuremeter curve Note that Roctest offers a spreadsheet TEXAMCOMPANION for data reduction You may contact us to get a free copy Reading interpretation can be done referring to the following documents ASTM D4719 07 Stand...

Page 28: ...e two sides of the piston 7 At each constant pressure step record the volume readings at regular intervals 8 To return the piston to its initial position it is necessary to couple the actuator screw to the piston shaft using the knurled nut Please note that pressuremeter equipped with a creep test kit should be assembled as shown on the following picture Volume readings of the electrical sensor vs...

Page 29: ...te PMT probe l Vulcolan steel ring F Probe shoe m Vulcolan collar G Probe to bench vice adaptor n Metallic sheath Tecalan Tubing and Connectors a Tecalan Tubing Assembly b Tecalan Connector 10 1001001145 including a Socket b and a Coupling c c d Adaptor from probe to Tecalan e Ferrule 05 R17LA1111000 f Modified Nut 10 mm 10 1001001149 g Male quick connect h Elbow Connector optional i Union for spl...

Page 30: ...E1001A 171107 29 Typical Corrected Test Data ...

Page 31: ...E1001A 171107 30 Optional Pressure Gauge Operation For more info see www ashcroft com ...

Page 32: ... contact below 400 cc uniform borehole Unless otherwise specified the test is terminated when sufficient data has been accumulated for the intended purposed of the test typically between 1000 and 1200 cc for an NL probe or before reaching high risks of bursting the probe as indicated on this chart Note that the probe may burst at lower pressures depending among others on how the sheath was assembl...

Page 33: ...essure Units Variations Units Volume cc Pressure Units Variations Units Soil Description ________________________________________________Temperature ___________ Pressuremeter Type _________________________ Notes ____________________________________ _____________________________________________________________ Operator _______________ PRESSUREMETER TEST DATA SHEET ...

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