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Related Manuals for Geosense GXM-300 Series
Summary of Contents for Geosense GXM-300 Series
- Page 1 V1.4 July 2020 GXM-300 SERIES MAGNETIC SETTLEMENT SYSTEM...
- Page 2 V1.4 July 2020...
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Page 3: Table Of Contents
V1.4 July 2020 CONTENTS Page 1.0 INTRODUCTION 1.1 General Description 1.2 Theory of operation 1.3 Components 2.0 DELIVERY 2.1 Packaging 2.2 Handling 2.3 Inspection 2.4 Storage 3.0 INSTALLATION 3.1 BASE Readings 3.2 Getting Started 3.3 Installation - GXM300 12-18 3.4 Installation - GXM300I 4.0 DATA 4.1 Taking Readings 4.2 Data Reduction... -
Page 4: Introduction
V1.4 July 2020 1.0 INTRODUCTION This manual is intended for all users of the GXM-300 Series manufactured by Geosense and provides information on their installation, operation and maintenance. It is VITAL that personnel responsible for the installation and use of the GXM-300 Series READ and UNDERSTAND the manual, prior to working with the equipment. -
Page 5: Theory Of Operation
V1.4 July 2020 1.2 Theory of Operation The GXM300 Series magnetic extensometers is installed in embankment fills or boreholes that are associated with different civil / geotechnical engineering applications. The GXM300 Series magnetic extensometers come in two different forms, as follows:- Magnetic Settlement Systems GXM300. -
Page 6: Components
V1.4 July 2020 1.3 Components Access Tubing (GXM-300) : Allows the reed switch probe to be lowered so measurements of the magnetic target position can be taken. Inclinometer Casing (GXM-300I) : The casing allows the reed switch probe to be lowered so measurements of the magnetic target position can be taken. -
Page 7: Delivery
V1.4 July 2020 2.0 DELIVERY This section should be read by all users of GXM-300 Series manufactured by Geosense. 2.1 Packaging GXM-300 Series are packed for transportation to site. Packaging is suitably robust to allow normal handling by transportation companies. Inappropriate handling techniques may cause damage to the packaging and the enclosed equipment. -
Page 8: Installation
V1.4 July 2020 3.0 INSTALLATION This section of the manual is intended for all users of GXM-300 Series manufactured by Geosense and is intended to provide guidance with respect to their installation. It must be remembered that no two installations will be the same and it is inevitable that some ‘fine tuning’... -
Page 9: Getting Started
Number of installation, datum magnet and magnetic targets. Borehole Identification. Boreholes that require the GXM-300 Series to be installed in them should be clearly identified and a labelling/ marking scheme should be established with the client before installation is under taken. - Page 10 V1.4 July 2020 3.3 Installation Procedures - GXM300I Check the drill hole to ensure that the full depth is clear and free of obstructions. Ensure that the base of the borehole is in solid ground. Lay out all the equipment that is supplied, ensuring that the quantity is correct for the installation.
- Page 11 V1.4 July 2020 3.3 Installation - GXM300I contd… Measure and mark the intended location of the datum magnet. Place the magnet over the access tubing and screw the datum magnet in place with the provided Allen key. Duct tape around the corrugated piping and the access tube.
- Page 12 V1.4 July 2020 3.3 Installation - GXM300I contd… Ensure the access tube is firmly in place. Ensure the access tube’s verticality, with a spirit Fill borehole with bentonite pellets. Cover the borehole with fill marital.
- Page 13 V1.4 July 2020 3.3 Installation - GXM300I contd… Insert the first coupling joint over the access tube and ensure that the corrugated piping is pushed into the coupling join firmly. Attach coupling joint to corrugated piping with the screws provide. Place top cap on access tubing.
- Page 14 V1.4 July 2020 3.3 Installation - GXM300I contd… Place fill around the installed access tube. Ensure that the fill is placed by hand around the access tubing. Attach the next access tubing length to the just installed access tube. Place the next corrugated piping over the access tubing and into the coupler, ensuring that the corrugated piping is firmly in the coupler.
- Page 15 V1.4 July 2020 3.3 Installation - GXM300I contd… Place the magnetic coupler over the just installed access tube and corrugated piping. Ensure that the corrugated piping is firmly pushed into the coupler. Screw the corrugated piping in place with the screws provided.
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Page 16: Installation - Gxm300
V1.4 July 2020 3.3 Installation - GXM300I contd… Screw the corrugated tubing in place with the screws provided. Repeat for the number of magnets required. Proceed to place and compact fill around installation by hand. Installation is complete. 5.4 Installation - GXM300 The installation for the GXM300 is exactly the same as the GXM-300I except the internal access tube is 33mm (1”) with flush threads and the external corrugated pipe is 35mm external diameter. -
Page 17: Data
V1.4 July 2020 4.0 DATA 4.1 Taking Readings TO ENSURE CONSISTENT READINGS MAINTAIN THE SAME PROCEDURES EVERY TIME READINGS ARE TAKEN. WHEREVER POSSIBLE USE THE SAME REED SWITCH PROBE. IF DIFFERENT PROBES ARE USED ALWAYS TAKE BASE READINGS WITH EACH PROBE AND COMPARE DATA. APPLY ANY OFFSET TO LATER READINGS Remove top cap. - Page 18 V1.4 July 2020 4.1 Taking Readings contd... Please Remember …….It is ABSOLUTELY VITAL that the same procedure is adopted for ALL monitoring operations on the same instrument. There are more than one methods that can be employed to gather data from Magnetic Extensometers.
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Page 19: Data Reduction
V1.4 July 2020 4.2 Data Reduction Readings taken from the GXM300 Series are taken from the top of the access tube, to indicate the depth of the probe. Therefore the site readings are referenced to the top of the access tubing and not the datum magnet. The data in the table below show reading sets recorded from 1 instrument over 6 months: Magnet Collected Readings... - Page 20 V1.4 July 2020 4.2 Data Reduction contd.. Settlement Calculations Once the inverted values have been obtained, as shown on the previous page, the calculation of settlement can be made. This calculation uses the first month’s ‘inverted’ readings as the initial readings, subtracting the current month’s ‘inverted’ values to determine the ‘change’.
- Page 21 V1.4 July 2020 Settlement Calculations contd... In the previous graph, the settlement profile for each months data is presented as a line which joins the change / elevation co-ordinates. The negative ‘change’ values mean that the graph expands to the left as settlement increases.
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Page 22: Grouting
V1.4 July 2020 5.0 GROUTING THERE IS OFTEN CONFUSION REGARDING THE PURPOSE OF THE SPIDER LEG SPRINGS. THEY ARE NOT AS MOST PEOPLE THINK TO KEY INTO THE SURROUNDING GROUND. ALTHOUGH SOME KEYING EFFECT MIGHT OCCUR THE LEGS ARE ONLY THERE TO KEEP THE TARGET IN PLACE UNTIL IT IS GROUTED. ONCE GROUTED THE LEGS BECOME REDUNDANT. -
Page 23: Maintenance
V1.4 July 2020 MAINTENANCE As the GXM300 Series access tubing and magnetic targets are installed within a borehole and grouted or within embankments it is a non-retrievable system and therefore maintenance free. However the reed switch probe will require some basic maintenance including the following:- Status of the battery - change as required •... -
Page 24: Specification
V1.4 July 2020 8.0 SPECIFICATION GXM-300 Access Casing OD 33mm Access Casing ID 25mm Casing Length 1.0 or 3m Casing Weight 0.6kg/m Bottom Cap OD 33mm Material CORRUGATED PIPE (compressibility 40%) Pipe OD 42mm Pipe ID 35mm Length 3m ,50m coil Magnetic Target/Coupler 42 x 50mm Material... -
Page 25: Spare Parts
V1.4 July 2020 GXM-300i contd... CORRUGATED PIPE (compressibility 40%) Pipe OD 90mm Pipe ID 75mm Length 3m ,50m coil Magnetic Target/Coupler 90 x 70mm Material ACCESSORIES ACCESSORIES Mastic Tape Reed Switch Probe 30,50,100,150, 200m 9.0 SPARE PARTS The access tubing of GEO-XM Series magnetic settlement system (GXM100, GXM100T, GXM100P and GXM100C) is installed within non-recoverable environments (below ground) it is not serviceable nor does it contain any replaceable parts. -
Page 26: Return Of Goods
10.2 Chargeable Service or Repairs Inspection & estimate It is the policy of Geosense that an estimate is provided to the customer prior to any repair being carried out. A set charge for inspecting the equipment and providing an estimate is also chargeable. -
Page 27: Limited Warranty
Sufficient site data has been provided to Geosense by the purchaser as regards the nature of the installation to allow Geosense to select the correct type and range of GXM300 Series and other component parts. The GXM300 Series equipment shall be installed in accordance with the manufacturer’s recommendations. - Page 28 V1.4 July 2020...
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