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Geosense VW PIEZOMETERS, Инструкция по эксплуатации

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Version 1.4 May 09 

 
 

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VW PIEZOMETERS

 

Содержание VW PIEZOMETERS

Страница 1: ...Version 1 4 May 09 I N S T R U C T I O N M A N U A L VW PIEZOMETERS...

Страница 2: ...e Readings 5 2 Preparation for installation 5 3 Installation Procedures Boreholes 5 4 Installation Procedures Trenches Pockets 5 5 Installation Procedures Observation Wells or as Water Level Sensor 5...

Страница 3: ...hind retaining walls Assessing soil consolidation Measurement of uplift pressures acting on structural foundations Verification of seepage patterns and models Slope stability monitoring Water level mo...

Страница 4: ...iring conditions and resistant to interference from external electrical noise The MGS Geosense range of VW piezometers is supplied in various configurations to suit varying installation environments a...

Страница 5: ...wire to oscillate at its resonant frequency The wire continues to oscillate for a short period through the field of the permanent magnet thus generating an alternating current sinusoidal output The fr...

Страница 6: ...w Voltage Directive 73 23 EEC as amended by 93 68 EEC The Electromagnetic Compatibility Directive 2004 108 EC The Construction Products Directive 89 106 EEC Equipment description Vibrating Wire Piezom...

Страница 7: ...7 Version 1 4 May 09 3 0 MARKINGS Geosense piezometers are labelled with the following information Manufacturers name address Product type Model Serial number CE mark...

Страница 8: ...of Vibrating Wire Piezometers manufactured by MGS Geosense 4 2 Handling Whilst they are a robust devices VW piezometers are precision measuring instruments They and their associated equipment should a...

Страница 9: ...units eg 0 03612 a calculation must be performed to convert to Hz2 1000 Linear Digits units since the calibration sheet is presented in Hz2 1000 units The Geosense Readout model VW200 displays the re...

Страница 10: ...reeze Storage areas should be free from rodents as they have been known to damage connecting cables No other special requirements are needed for medium or long term storage although temperature limits...

Страница 11: ...the following procedures will be required to suit specific site conditions 5 1 ZERO Pressure or BASE Readings Vibrating wire transducers differ from most other pressure sensors in that they indicate a...

Страница 12: ...With the transducer still submerged in the water carefully remove the filter from the piezometer body by carefully twisting and pulling it leaving both submerged in the water 5 At the free end of the...

Страница 13: ...he transducer to the water with the open end upwards but submersed 10 Obtain and record the barometric atmospheric pressure for future use It is best to use a site based reading but a local metrologic...

Страница 14: ...14 Version 1 4 May 09 13 Store the piezometer in water until ready for installation or repeat the above just prior to installation Continued from page 13...

Страница 15: ...th or observation well installation is probably the next most common It simply allows groundwater from any horizon to flow into the borehole to be registered by the piezometer Where a rapid response i...

Страница 16: ...r to placing 5 Bentonite seal Where a sealed pocket is to be formed for the piezometer compressed and dehydrated Bentonite in the form of either pellets balls chips etc is commonly used to form the se...

Страница 17: ...the installation of Vibrating Wire Piezometers Fibre measuring tape with a weight added to the end for borehole depth measurement and cable length measurement Shovel for placing and levelling fill by...

Страница 18: ...nse and a gen eral understanding of the sub surface conditions There are many approaches to piezometer installation and in addition to these broad installation guidelines MGS Geosense are committed to...

Страница 19: ...ole Be sure not to let the pellets balls plug or stick to the inside of the casing by checking the depth using a weighted tape Ensure that the Bentonite level always remains below the bottom of the ca...

Страница 20: ...there is enough slack cable to prevent the casing pulling the piezometer back up the borehole This will have to repeated whenever casing is to be raised or removed When a section of casing is removed...

Страница 21: ...maining void with Grout as shown in the grouting procedure See Section 5 6 15 The piezometer installation is now complete but the initial in situ piezometer readings have yet to be recorded Since the...

Страница 22: ...se of the borehole slowly drop Bentonite pellets balls down the borehole Be sure not to let the pellets balls plug or stick to the inside of the borehole Feeding pellets balls in to the borehole too q...

Страница 23: ...hould now be recorded Since the piezometric balance may have been disturbed by the installation operations a series of piezometer readings may have to be recorded so as to determine when the pressure...

Страница 24: ...shed to the required elevation the rods and adaptor can be extracted leaving the piezometer in place Where drilling rods are to be used to push the piezometer only into the base of the borehole it is...

Страница 25: ...occur The calibration and Zero values would then be invalidated The piezometer would not then provide any useful data 7 If necessary use hydraulic equipment rig head or jacking ram to apply gradual l...

Страница 26: ...tended location referring to the marks placed on the piezometer cable Since no sand filter will be installed the piezometer must be supported in the borehole by its cable so that the grout can be plac...

Страница 27: ...ively to maintain short term saturation in highly permeable tidal locations for example piezometers can be installed with their filter downwards in a small plastic container filled with saturated coar...

Страница 28: ...pocket as shown 6 Coil the cable in the pocket to form a loop as shown This helps to reduce the risk of cable damage due to excessive settlement or stretching 7 Lay a section of the cable into the tr...

Страница 29: ...be installed Check the elevation of the pocket to ensure that the piezometer will be installed at the correct level See sketches for level details 4 The piezometer can be either placed in the pocket a...

Страница 30: ...ezometer by hand and using only light hand held machines around the cable 11 Complete the cable laying operation snaking the cable in the trench only where specified and backfill the trench with grade...

Страница 31: ...eters are available In these instruments the rear of the diaphragm is vented to atmospheric pressure by a fine tube included in the special cable This removes the need for barometric compensation as b...

Страница 32: ...to batch it is important to use representative samples of the material that will be used on site when preparing samples for lab testing and mix design Where the grout is to be used to backfill for a...

Страница 33: ...06 portable readout 1 Connect signal cable from the sensor to the readout following the wiring colour code Conductor colours may vary depending upon the extension cable used Commonly these are RED VW...

Страница 34: ...Period units e g 0 03612 or 3612 depending upon the readout used the first step to producing an engineering value is to convert the reading to Linear Digits Hz2 1000 Two examples of this calculation c...

Страница 35: ...each factor or at the end of the equation 1 psi 0 7031 mH2O for example An instrument calibration sheet similar to the example in the appendix of this manual includes the following information Model...

Страница 36: ...units Seconds 7 to Metres of Water mH2O using a Linear equation is given below Site Zero Reading 3235 Zero Converted to Linear Digits 9555 5 Calibration Factor for mH2O K 0 18159 Current Reading 3289...

Страница 37: ...e applied Either a special barometric transducer or an additional low pressure piezometer can be used to measure atmospheric pressure The following is an example of how to carry out the correction usi...

Страница 38: ...y However if a low range piezometer is suspended in a shallow standpipe or well it may be affected by day to day changes and seasonal changes in temperature In this instance temperature corrections co...

Страница 39: ...rade 17 4 stainless steel There is also a Nitrile rubber O ring sealing the diaphragm and the stainless steel body It would only be necessary to resort to dissolving any build up if it either blocked...

Страница 40: ...40 Version 1 4 May 09...

Страница 41: ...tection Semitron Bi Polar 230V Excitation Pluck or Swept Frequency Filter Options Ceramic 3 bar air entry Sintered Stainless Steel 316 50 Micron Standard Pressure Ranges When the temperature has stabi...

Страница 42: ...ilter assembly Civil engineering sites are hazardous environments and instrument cables can be easily damaged if they are not adequately protected Geosense can therefore provide the following parts th...

Страница 43: ...mination please contact MGS Geosense for details Inspection estimate It is the policy of MGS Geosense that an estimate is provided to the customer prior to any repair being carried out A set charge fo...

Страница 44: ...ch are determined to be defective upon inspection at the factory Shipment of defective part or parts to the factory shall be at the expense of the Purchaser Return shipment of repaired replaced part o...

Страница 45: ...45 Version 1 4 May 09 VW piezometer specification Mikolit specification Bentonite specification Sample VW piezometer calibration sheet 12 0 APPENDIX...

Страница 46: ...is a division of Marton Geotechnical Services Ltd Geotechnical Centre Rougham Industrial Estate Rougham Bury St Edmunds Suffolk IP30 9ND England Tel 44 0 1359 271167 Fax 44 0 1359 271168 email info m...

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