USER`S MANUAL TAPE EXTENSOMETER MODEL 98073
Contents
1. WARRANTIES WHICH EXTEND BEYOND THE DESCRIPTION ON THE FACE HEREOF AGI s liability arising out of the sale of its goods is expressly limited to the repair and or replacement of defective parts or the cost of such repair and or replacement APPLIED N D00048 Rev A 11 GEOMECHANICS If software does not perform substantially in accordance with the documentation the entire and exclusive liability and remedy shall be limited to either at AGI s option the replacement of the software or the refund of the license fee you paid for the software Liability for any other form of loss or damage is hereby expressly excluded Customer shall indemnify AGI against any third party claim arising out of the use of goods and or services supplied by AGI including any claim arising directly or indirectly out of alleged negligence on the part of AGI its employees servants representatives or agents APPLIED N D00048 Rev A 12 GEOMECHANICS2. for the tape extensometer has an anchor distance of about one meter The calibration should always be done at the same temperature and in a temperature controlled room Whenever the tape extensometer is used sufficient time should be allowed for the instrument and calibration stand to equilibrate to the ambient temperature APPLIED NN D00048 Rev A 2 pe It is always advisable to maintain a record of the temperature and correct the readings accordingly Temperature induced lengthening or shortening of the steel tape is obtained by multiplying the thermal expansion coefficient in Table 2 by the temperature change and then by the exposed length of the tape For example if the temperature change is 10 C and the tape is unreeled to a length of 10m the temperature induced lengthening is 11 x 10 x 10 C x 10 000mm 1 1mm 1 3 Digital Display Table 3 Digital Display Specifications Resolution 0 01mm 0 0005 in Accuracy 0 02 mm 0 0001 in Repeatability 0 01 mm 0 0005 in Power One SR44 silver oxide cell Battery Life 3 years under normal operation Operating Temperature 0 C to 40 C Storage Temperature 10 C to 60 C NOTE These specifications are for the digital display only and not for the complete extensometer CAUTION If the tape extensometer is not used for more than three months remove the battery from the LCD compartment and store it properly Otherwise liquid may leak from the battery and dama
3. the previous punched hole This previous reading B A reading will always have to be added to subsequent readings to determine the correct displacement between the two points The following example illustrates this point Initial tape hole reading TH 20 03 2007 14 725 mm APPLIED NN D00048 Rev A 4 pee Initial digital reading A 20 03 2007 20 25 mm Subsequent digital reading B 25 06 2007 30 55 mm Convergence B A 10 30 mm At this stage because the digital reading has gone beyond 30 mm it is essential that another reading be taken on 25 06 07 with pin 9 in the adjacent hole of the tape As convergence has taken place the pin 9 will now align with the tape hole at around 14 712 5 mm The readings will be something like as follows New initial tape hole reading TH 25 06 2007 14 712 3 mm New initial digital reading A 25 06 2007 18 52 mm Subsequent digital reading B 10 08 2007 20 55 mm Convergence since 25 06 07 2 03 mm Total convergence from beginning 10 30 2 03 12 33 12 33 mm 2 3 Replacing Battery If B appears on the indicator the battery voltage is low Immediately replace the battery Remove the LCD compartment lid by unscrewing the eight M2 x 12 screws Replace the SR 44 battery with its positive side facing up Refasten the compartment lid NOTE Always use an SR44 battery silver oxide cell Do not attempt to charge or disassemb
4. USER S MANUAL TAPE EXTENSOMETER MODEL 98073 01 Serial No APPLIED GEOMECHANICS A DIVISION OF PINNACLE TECHNOLOGIES 140 Chestnut Street San Francisco CA 94111 USA Tel 415 364 3200 Fax 415 861 1448 info geomechanics com www geomechanics com Copyright 2008 by Applied Geomechanics All rights reserved Document No D00048 Rev A TABLE OF CONTENTS 1 Introduction and Specifications cie etie tt epe AEE EEEE eb tetro ee bk ele indi deerers 1 1 1 Operating Principles A dede N Hesan TN 2 1 2 General DesCEptOn 2 ail ei a ede preset edes te etae eon tb Ee teens 2 1 3 Digital Display ttti Hoe i te i Lae en e eb t Hg oti e ie fa 3 2 Detailed Instructions nee e een cet tee tii 3 PAX IB ERES TID ATE senp UE Ea ENESE TROET NOE LANET EEE AEEA EEEE EE EA EE EEEE 3 2 2 Subsequent Readings comia e fate eee f NES Nod Ne mette eie 4 2 5 Replacing Battery 2 25 iue RR HR IIR N E Na RA sn RAN 5 2 4 Tape Extensormeter COMponents tati eee pe ee tee dee Eod ene tient 6 2 5 AxiS ATigntnetita ee eth teer petere e De beans el tbe rette eer 7 2 6 Replacing the Tape eee eet Tte tene e atac 7 3 Observation SHES oes Gare Rte eg f ie eI e regiis tate iii 10 4 Warranty and Limitation of Liability ses r ssrssstesnses rigesterssspens ioesstesbesprss sdessrerbgsninbissesntnsenvsrsbesernear elers 11 1 Introduction and Specifications The Applied Geomechanics tape extensometer is a precision instrument designed to mea
5. and c that return authorization is received from AGI prior to the goods being sent back Should goods be damaged in transit to the Purchaser AGI will accept no liability unless the Purchaser can show that such damage arose solely from AGI s failure to pack the goods properly for shipment Software products are warranted to perform substantially in accordance with their documentation for 90 days following your receipt of the software AGI and its suppliers do not and cannot warrant the performance or results you may obtain by using the software or its documentation In respect of goods or parts thereof manufactured by others and resold by AGI AGI will pass on to the customer the benefit of any guarantee or warranty received by AGI from the original manufacturer insofar as such guarantee or warranty is assignable ANY OTHER CONDITIONS OR WARRANTIES WHETHER EXPRESS OR IMPLIED BY STATUTE OR OTHERWISE ARE EXCLUDED THE REMEDIES PROVIDED HEREIN ARE THE BUYER S SOLE AND EXCLUSIVE REMEDIES APPLIED GEOMECHANICS INC SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES INCLUDING LOST PROFITS OR LOST SAVINGS WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY THIS WARRANTY EXTENDS ONLY TO THE ORIGINAL PURCHASER AND IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES WHETHER OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR USE AND OF ALL OTHER OBLIGATIONS AND LIABILITIES OF ANY KIND AND CHARACTER THERE ARE NO
6. e The extensometer is now ready to be checked on the calibration frame N D Engaging A o Tape pin plate B Kg anchor pin Lock slide Side plate Figure 5 Remove Tape APPLIED N D00048 Rev A 8 GEOMECHANICS D00048 Rev A Figure 6 Install Tape VA N Y W N d 4 N Lo N P4 N NN A f EN A New Tape Roll APPLIED GEOMECHANI A DIVISION OF PINNACLE TECHNOLOGIES 3 Observation Sheet TAPE EXTENSOMETER SERIAL REFERENCE LOCATION gt INITIAL READING Date Temp Tape hole Digital reading Tape hole Digital reading Tape hole Digital reading reading A reading A reading A TH TH TH C mm Mm mm Mm mm mm SUBSEQUENT READINGS Date Temp Digital Convergence Digital Convergence Digital Convergence reading B A reading B A reading B A B B B C mm Mm mm Mm mm mm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NOTE 1 Spacing of holes on tape is about 12 5 mm In case reading on digital indicator reaches about 30 mm it is required that extensometer reading be taken with pin 9 in present hole on tape and then repeated with pin in adjacent hole This will allow continuity in data Replace Observation Chart for this reference location with a
7. emperature reading at the site after the extensometer readings have been completed 11 Unlock the lock slide 10 and carefully wind in the tape after the work is completed 12 Clean the tape extensometer after completing the work 13 Pack the extensometer in the case provided To do this it may be necessary to adjust the extensometer serrated knob 2 2 2 Subsequent Readings For taking subsequent readings follow instructions given in Steps 1 to 13 above If the two anchor points change in distance over time the digital display will show an increased or decreased numerical reading For example assume that pin 9 engages the punched hole at 13 225m and that the digital readout displays 14 65 at the time of initial reading If in a subsequent reading pin 9 engages the same punched hole and the digital readout displays 10 45 the distance between the two points has increased by 4 20mm The spacing of the holes in the tape is about 12 5mm If deformation causes the digital display to reach about 30 mm the subsequent extensometer reading must be taken with pin 9 in a different hole than the initial reading This is essential to allow continuity in the data In this situation replace the Observation Chart for this reference location with a new one The new initial reading will then be referenced to the new punched hole Make a note at the bottom of the observation sheet to this effect and specifically note the B A reading with reference of
8. ension by means of a spring inside the extensometer housing A precision digital readout measures this fine adjustment reading while the tape is held under a constant repeatable force The difference from a reading that was recorded earlier gives the change in distance between the two anchor points The marked graduation on the tape where the pin 9 engages the punched hole in the steel tape is used only as a reference for taking future readings For determining change in distance at any given time only the reading on the digital readout is compared with the initial reading assuming that the same punched hole is engaged on the pin If the measured deformation is so large that a different hole must be used the interval between the two holes may be added or subtracted to the fine reading to get the total change in distance Note The tape extensometer is not to be used for measuring absolute distances between two points It only measures the change in distance between them Never add the reading on the tape to the digital reading to get the correct distance between the two points This will give you erroneous results Measurements if properly taken by an experienced operator are repeatable to within 0 125 mm 0 005 For maximum accuracy it is recommended that the same instrument be used for each project To check the zero stability and accuracy of the tape extensometer a calibration frame must be used The Applied Geomechanics calibration frame
9. ge the tape extensometer NOTE The digital display reads in metric units You may change the display from metric units to English units by first removing the LCD compartment lid by unscrewing the eight M2 x 12 screws Then change the display units by operating the display change pin 2 Detailed Instructions 2 1 Initial Reading 1 Record in the Observation Chart Section 3 the reference location temperature and date of the initial reading Let the temperature of the extensometer stabilize within the location for about half an hour before taking the reading 2 Press the on off pin on the digital readout of the LCD to display a reading 3 Unscrew the extensometer serrated knob 2 to adjust the reading to approximately 000 00 4 Hook the shackle 4 at the end of measuring tape to the eyebolt on the anchor 5 at one side of the rock face cavity or tunnel wall 5 Carefully transport the extensometer to the other anchorage point allowing the punched tape to unreel until the shackle on the extensometer body can be hooked on to the opposite eyebolt Take care that the holes in the tape measure 3 do not get entangled in the pin 9 CAUTION Take care that the holes in the tape measure 3 do not get entangled in the pin 9 during winding or unwinding of the tape reel This can damage the tape extensometer APPLIED NN D00048 Rev A 3 GEOMECHANICS 6 Take the slack out of the tape 3 by winding it on the reel Loosen it slightl
10. le the battery It may be short circuited Error Symptoms and Remedies ErrC and display flickering appear when the scale surface inside the LCD compartment is stained Remove the lid of the LCD compartment and clean the scale Apply a small amount of low viscosity oil to repel water If E is displayed the tape extensometer is in the same state as that of ErrC Use the ErrC remedy APPLIED NN D00048 Rev A 5 pee 2 4 Tape Extensometer Components LL LLL LILLI PA 5 No Description 4 S 1 Body 2 Serrated knob N 3 Tape measure D 4 Shackle 5 Anchor 6 Arm A 7 Meter hook 9 8 Tape guide i 8 9 Engaging pin 10 Lock slide White Fp Black N mark A 0 NL L3 2 p P S J 6 Z8 N N 1 N a 8 N 10 SS S S EN KN I 7 AKON N ASN NNN Figure 1 Tape Extensometer Components D00048 Rev A 6 Material Oty Aluminium 1 Aluminium 1 Steel 1 AISI 304 1 Mild steel 2 Aluminium 1 AISI 304 1 Aluminium 1 AISI 304 1 AISI 304 1 APPLIED GEOMECHANICS 2 5 Axis Alignment 1 Align Marks N 000 00 d mm in T Y Figure 2 Marks Aligned 2 Sway extensometer slightly N N 000 00 A mm in 7 booth RS Figure 3 Center Mark Moves Away from Digital Readout 3 If the center mark moves away from the digital readout when the extensometer is swayed side to side or up and down the tension needs further adjustment Apply more tensi
11. new one The new initial reading will then reference the adjacent punched hole Make a note at the bottom of the observation sheet to this D00048 Rev A API PLIED GEOMECHANICS effect and specifically note the B A reading with reference of the previous punched hole This previous reading B A reading will always have to be added to subsequent readings to determine the correct displacement between the two points NOTE 2 If required observation sheet may be extended for more than three reference locations Any standard worksheet like Excel may be used to store the data in a computer NOTE 3 Sign convention Positive B A denotes convergence Negative B A denotes divergence 4 Warranty and Limitation of Liability Standard goods those listed in Applied Geomechanics published sales literature excluding software manufactured by Applied Geomechanics Inc AGI are warranted against defects in materials and workmanship for twelve 12 months from the date of shipment from AGI s premises with the following exceptions AGI will repair or replace at its option goods that prove to be defective during the warranty period provided that they are returned prepaid to AGI and a that the goods were used at all times for the purpose for which they were designed and in accordance with any instructions given by AGI in respect of them b that notice is received by AGI within 30 days of the defects becoming apparent
12. on through the serrated adjustment knob 000 00 mm in boty Figure 4 Center Mark Moves Toward Digital Readout 4 Ifthe center mark moves towards the digital readout when the extensometer is swayed side to side or up and down the tension is correctly set and a reading may be taken 2 6 Replacing the Tape To change a damaged tape measure the following procedure is recommended 1 Unscrew four M2 screws marked A in Figure 5 to remove the engaging pin plate This will release the tape from its slot 2 Reel off the damaged tape from the reel Knock out the tape anchor cylindrical pin from the reel using a suitable drift punch APPLIED NN D00048 Rev A 7 GEOMECHANICS 3 Place the extensometer with the handle side down Unscrew five M3 screws marked B in Figure 5 and lift side plate from the reel bracket assembly 4 Take out the new tape and place over the reel with the tape end facing the way shown in Figure 6 5 Engage the cylindrical tape anchor pin in the hole in the reel and gently knock the pin in until the tape sides are flush with the reel sides 6 Assemble the side plate and tighten with the five M3 screws 7 Tighten the engaging pin plate back after passing the tape through the slot 8 Cut the cable tie holding the tape rolled only after this procedure is complete 9 Rotate the handle clockwise to compact the tape reel and lock the reel by pushing the lock slid
13. onents in Figure 1 Applied Geomechanics tape extensometer has an epoxy coated aluminium body 1 that houses the digital display The display is a five digit LCD screen that works on a 1 5 V silver oxide SR 44 button cell battery The body 1 contains a push type on off power switch The hole positioning is taken from the graduate markings on the steel measuring tape After tension adjustment a reading is observed on the digital display that has a resolution of 0 01 mm 0 001 in Readings taken off the tape itself should only be used as a reference Fine readings are taken using the adjustment knob 2 and the LCD display as described below To take displacement readings the stainless attachment shackle 4 at the end of the steel tape is hooked to an anchor point 5 grouted in the structure or the excavation The tape is then allowed to unreel until the shackle on the other end 7 can be hooked to the second anchor point The slack is taken out of the tape and coarse tension adjustment is accomplished by inserting the engaging a pin 9 into one of the punched holes in the steel tape The holes are spaced at 12 5 mm 2 intervals along the entire length of the tape The fine tension adjustment is achieved by rotating a serrated aluminum adjustment knob 2 that shortens the overall length of the device until two index marks on the extensometer coincide white mark and black mark in Figure 1 At this point the tape is held at a standard t
14. ound behavior and may give rise to the deformations measured by your tape extensometer These factors include seasonal weather changes temperature rain barometric pressure earthquakes traffic construction activity ocean tides excavation and sequence of construction Personnel changes also can result in measurement differences as the technique of individual technicians may vary These factors should be observed and recorded to assist in correlating data and interpreting your measurements APPLIED NN D00048 Rev A 1 GEOMECHANICS 1 1 Operating Principle The tape extensometer measures the displacement that takes place over time between two reference anchors fixed in an excavation or structure It is designed to accurately measure small changes in distance between two points that may be from 1m to 30m 3 ft to 100 ft apart 1 2 General Description The tape extensometer consists of a steel tape a tape tensioning apparatus with a tension spring and tension adjustment knob a small digital readout and two shackles that allow the tape to be stretched between two anchor points Figure 1 The built in tension spring and indexing mark allow the tape to be tensioned at a constant value for each measurement This permits the measurement to be made with high repeatability and a minimum amount of sag in a horizontal inclined or vertical direction Note The item numbers that accompany the descriptions in the following pages refer to the numbered comp
15. sure the change in distance between two points on a structure rock mass or excavation It is a valuable piece of equipment for monitoring the deformation of foundations slopes embankments underground openings bridges buildings and other structures This instrument is also a vital tool for investigations of tunneling especially tunnels constructed using the New Austrian Method of Tunneling NATM NOTE The tape extensometer is designed to measure change in distance between two points It is not meant for measuring actual distance between two points Features e Rugged compact and cost effective e Lightweight portable and reliable e Measures small changes over distances of 1m to 30m longer tape measure available on request e Heavy duty engineering steel tape e Large serrated knob for easy tension adjustment e Rapid and accurate measurement can be made with the tape extended in any direction Table 1 Tape Extensometer and Accessory Model Numbers Tape Extensometer 98073 01 Calibration Frame 98073 02 Replacement Tape 98073 03 Convergence Eye Bolt and Anchor 01639 Table 2 Tape Extensometer Specifications Measurement mm inch Length of Tape 1 30 m 3 100 ft Measurement Precision 0 1 mm 0 005 in LCD Resolution 0 01 mm 0 0005 in Coefficient of Linear 11 ppm C 6 11 ppm F Thermal Expansion of Tape Please note that many different factors affect structural and gr
16. y until the nearest punched hole just engages with the pin 9 at the end of the extensometer 7 Lock the lock slide 10 to prevent the tape from unreeling 8 Tension the tape by turning the serrated adjustment knob 2 on the extensometer until the black reference mark on the brass cylinder is accurately aligned with the white reference mark on the body The precision of the alignment determines the accuracy of measurement The extensometer should be supported all times to avoid any force on the measuring tape due to its weight NOTE The extensometer must be supported by the operator to prevent the tape from sagging due to the weight of the extensometer body NOTE The axis of the extensometer body should be in line with the eyebolts on the anchors in the walls This can be done with a little practice by gently swaying the extensometer from side to side and up and down and at the same time observing the alignment of the reference marks on the extensometer From the correctly aligned position the black center mark will only move towards the digital readout and never away from it If the black center mark moves away from the digital readout more tension must be applied by tightening the adjustment screw Refer to Figures 2 to 4 9 Take a reading of the tape at the point where the extensometer pin 9 engages the punched hole Also take the digital display reading Record these in the Observation Chart sixth row from the top 10 Take a t
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