casagrande and standpipe piezometers
Contents
1. anD STANDPIPE CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 CASAGRANDE AND STANDPIPE PIEZOMETERS INDEX INTRODUCTION Page 4 DESCRIPTION Page 5 FILTER CELLS SATURATION Page 5 INSTALLATION Page 6 TAKING MEASUREMENTS Page 8 TROUBLESHOOTING Page 10 MAINTENANCE Page 10 WWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 2 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS Notes on the use of product For safe and efficient use of the product please read carefully the following instructions before starting any operation Any use of the product other than the one described in this manual shall be considered the user s full responsibility The same applies for any unauthorized modifications In addition to the hereby listed standards the user must comply with the provisions of the current legislation regarding personal safety and health together with all other persons in the workplace SISGEO is not responsible for any accident breakdown or other problems due to lack of knowledge and or non compliance with the requirements contained in this manual Check that the product has not been damaged during the transport Verify that the package includes all items as well as any requested optional accessories if anything is missing please promptly contact SISGEO The user must strictly follow all the operations described in this manual Maintenance or repair of the device is permitted only by authorized operators T2. covering casing 70cm measure casing 100cm Bentonite waterproof cap 70cm fay 5 3 2 oO Oo i 2 3 ad 5 5 O o 2 2 Q Q 8 T r GENERAL RECOMMENDATIONS Saturate the cell as explained in the previous paragraph flush accurately the hole with clean water until doesn t get out clear water use fine sand or gravel max 0 5 cm if the piezometer is expected to be at an intermediate quote fill in the empty part with a mix of water cement bentonite in order to recreate the consistency of the original ground wrap the teflon on the threads to secure the holding Join two casings using the couplings be careful when you screw the casings to the filter cell Handle the cell using the black upper junction DO NOT handle it by the filter Screw without forcing If there is a double casing tie them together with adhesive tape lower the casings in the borehole by hand Be careful Don t use pliers let the casing stick out the ground for 20 30 cm if necessary recover the coverings ensuring that the instrument will not be lifted use the protective cap to protect the casing WWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 7 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS TAKING MEASUREMENTS For Casagrande casing To create the cap pour the bentonite in more stages each layer shouldn t be more than 25 30 cm thick Compact the bentonite pellets with a pestle not s
3. sand and or gravel in order to allow the water to enter the casing through the filter After a while depending on ground permeability piezometer ae the water stabilizes at the water layer level casing We have a Casagrande piezometer when the filter cell is insulated from the borehole in order to measure the interstitial pressure in the layer where it is installed For the measure we use a water level indicator or an electric pressure transducer see manual Pressure Transducer Sisgeo designed a special pressure transducer that allows to close the filter cell obtaining a close circuit piezometer the measure of the interstitial pressure variations occurs more quickly also in waterproof grounds such as clay This transducer can be removed for the maintenance see manual Pressure Transducer standpipe filter unit WWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 4 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS DESCRIPTION WATER LEVEL INDICATOR Water level indicator consists of 1 a coated steel graduated tape and 2 electric conductors at sides 2 aprobe 3 some weights 4 a cable reel On a side there is a 9V power battery and an electronic circuit with a ringtone and a led light 2 batteries and a display for the water temperature level probe F I L T E R E L L S Porous filters saturation is needed to S A T U R A T I 0 N minimize t
4. E Problem Possible cause Solution There is no sound Low battery Change the battery Shake lightly the graduated tape to remove the waterdrops False contact caused from Non st d f H PER waterdrops or sticky liquids Aftersales assistance for calibrations maintenance and repairs is performed by SISGEO s service department The authorization for shipment shall be activated by RMA Return Manufacturer Authorization Create your account and then fill in the RMA module clicking on http www sisgeo com repairs html Send back the instrument equipment with the complete accessories using suitable packaging or even better the original ones The shipping costs shall be covered by the sender Please return to the following address with correct delivery documentation SISGEO S r l Via F Serpero 4 F1 20060 MASATE MI On the delivery document it is mandatory to indicate the RMA code received Technical assistance e mail assistance sisgeo com WWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 10 of 10
5. e Do not use solvents or strong detergents WNWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 8 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS MEASURE WITH WATER LEVEL INDICATOR TEMPERATURE The water level probe can be supplied with temperature sensor to gather the temperature at different heights e Turn the switch ON OFF on ON Level measurement Is active e follow the steps as described earlier move the switch in a central position to turn it off move the switch on temperature ON to gather the temperature in C on the display Attention the probe must be underwtater to work Wait 10 15 seconds or the time needed in order to adapt the steel probe to the temperature in the casing move the switch in a central position to turn it off rewind the tape on the reel e clean accurately the probe Do not use solvents or strong detergents CASAGRANDE PIEZOMETER With double casing installation if the measurements taken in the casing will become very different in time is recommended to clean the filter cell in order to clean the casings and the filter from impurities or air bubbles Enter in one of the two casings clean water at the minimum pressure needed for a forced flow making it leave from the other casing WWW SISGEO CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 9 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS TROUBLESHOOTING SERVIZIO MANUTENZION
6. he possibility that the filter pores would block increase the filter system answer speed when an external pressure is applied Usually the filter that has to be saturated is left in a container full of water for 24 h before the installation The saturation is more effective if the water had been previously de aerated making it boil for at least 10 minutes and then make it cool WWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER_EN_00_14 Page 5 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS INSTALLATION STANDPIPE PIEZOMETERS INSTALLATION The installation is expected in a borehole carried out through a continuous core or destructive drilling We recommend to always stabilize the walls with a temporary covering casing with an internal diameter not less 85mm while the use of muds shall be avoided To stabilize the bottom hole without water you shall keep water level within the borehole a little higher than piezometer level in the ground This precaution has to be taken also during the installation The needed tools are depth meter bentonite pellets teflon tape adhesive tape jig saw Installation scheme without filter tmeasure casing covering casing 100cm sand or gravel 70cm depth meter filter cell 70cm 50cm sand or gravel WWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 6 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS Casagrande installation scheme with seal
7. hese operators must be physically and intellectually suitable For information about instrument or to order spare parts always specify the product information which can be found on the identification label When replacing parts always use ORIGINAL SPARE PARTS The manufacturer reserves the right to make either technical and or commercial changes without prior notice It is our policy to keep manuals continuously updated Symbols Pay particular attention to the following instruction Identification Instruments can be identified e From a production lot number written on the Compliance Certificate e From a serial number s n engraved indelibly on the instrument e From a label on the instrument e From a label on the cable WNWW SISGEO COM CASAGRANDEANDSTANDPIPEPIEZOMETER EN 00 14 Page 3 of 10 CASAGRANDE AND STANDPIPE PIEZOMETERS I N T R 0 D U T I 0 N protective cap Standpipe piezometers also called open circuit have a wide use in civil and foundation engineering for the survey of waterbearing layer piezometer height or for the interstitial pressure in saturated grounds They can have a single or a double casing and they usually consist in e a filter unit or fissured casings covered with woven non vowen fabric e 3m long casings and different diameters 0 5 G 1 G 1 5 G 2 G 3 G e couplings e protective caps optional The borehole is filled around the casing with
8. upplied of suitable dimensions Verify with the depth meter the solidity of the cap and the quote reached Note if there is a waterproof ground coat higher then the layer you have been measuring it is recommended that the bentonite cap is made at the same height of the layer to restore the continuity If you need to install two piezometers with two different layers in the same borehole it will be necessary to make two filtering coats and two seals Pay attention to the stratigraphy and to the permeable and waterproof ground s coats thickness In this case the internal diameter of the casings must not be less then 110mm To perform a measurement you have to gather the water level quote within the casing using the graduated tape of the water level indicator It s important that the measurement Is taken always at the same quote Usually the reference is the casing head The topographyc survey of the casing height is useful to define the layer level measurement as absolute value 1 Drop carefully the probe in the piezometer casing until you hear a sound and the led switches on 2 lift the probe until the sound stops 3 if necessary shake a little the graduated tape to remove any drop of water that would stick on the probe and create a false signal 4 drop slowly the graduated tape until you reach precisely the level 5 gather the value in the chosen reference point 6 rewind the tape on the reel 7 clean accurately the prob
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