T-REX T-REX INCREMENTAL EXTENSOMETER SETTLEMENT GAUGES

Transcription

1 _ T-REX INCREMENTAL EXTENSOMETER SETTLEMENT GAUGES

2 T-REX INCREMENTAL EXTENSOMETER SISGEO designed the T-REX incremental extensometer to measure the position of magnetic rings set along the axis of inclinometer casing. Measurements are later used to calculate changes in position, which indicate displacement. T-REX probe incorporates two accurate linear transducers and is supplied with operating cable, placement rods and portable readout. The Archimede readout is supplied with a special battery pack to increase working time. A USB cable is used to transfer measurements from the Archimedes readout to a PC. Klion Software running on the PC uses T-Rex measurements to compute displacements at 1 meter intervals. APPLICATIONS Extrusion (detensioning) on tunnel face Vertical displacements in embankment dam Settlements along path of tunneling machine Displacements related to consolidation activity FEATURES Large measurement range for operation in both rock and soil High accuracy and repeatability Fully compatible with inclinometer components: tubing, cable, readout Simple, on-site plots Meet the essential requirements of the EMC Directive 2014/30/UE T-REX INCREMENTAL EXTENSOMETER 2

3 OPERATING PRINCIPLE The T-REX system requires model Sisgeo S141 inclinometer casing installed with external magnet rings fixed at 1 meter intervals along the length of the casing. The T-REX probe has an aluminum body. Two sensors inside the body are able to detect the magnetic field generated by the magnetic rings fixed to the casing. The sensors inside the probe are mounted exactly 1000 mm apart. When connected to the Archimede readout with the control cable and lowered into the casing, the system is able to detect the relative distance between two rings with great accuracy. T-REX surveys usually start from the bottom of the casing, if the botttom is in stable ground. First, the operator readings the relative distance between the two lower rings (ring 1 and ring 2). Then, the operator pulls the probe 1000 mm upwards to read the relative distance between ring 2 and ring 3, then ring 3 and 4, and so on, until all rings have been read. The first complete survey of the ring positions serves as the reference (baseline) survey. Subsequent surveys are compared to the first. Changes in the distance between rings indicates settlement or heave. It is possible to use the top ring as the reference, if the top of the casing is surveyed optically each time measurements are made. control cable ring 5 ring 5 STEP 1 STEP 2 waterproof connector ring 4 ring 4 upper sensor ring 3 ring 3 ring 2 ring 2 reading #1 reading # mm ring 1 ring 1 lower sensor T-REX INCREMENTAL EXTENSOMETER 3

4 T-REX SYSTEM PERFORMANCE (PROBE, CONTROL CABLE AND ARCHIMEDE READOUT) System repeatability ±0.02 mm over 1000 mm Maximum error under repeatability condition of measurement (same procedures, same operator, same measuring system same operating condition and same location) over a short period of time. System reading resolution 0.01 mm over 1000 mm The smallest increment (1 digit) shown on the readout. System accuracy ±0.04 mm over 1000 mm The accuracy that can be obtained in the field. PROBE TECHNICAL SPECIFICATIONS rod-probe connecting device 266 mm PRODUCT CODES Sensor type Measuring range Measuring base length Signal output Probe linearity Sensor resolution Temp. operating range Temperature effect Pressure Rating 0REX (probe only) 0REX45100S0 (with positioning device (1) ) high performace displacement transducer ±50 mm (100 mm) 1000 mm 0-10 V DC < ±0.2% FS mm 30 C to +75 C < 0.07 % FS / C IP68 up to 1.0 MPa (2) 15 mm (1) the positioning device is needed only for vertical or near-vertical measurements (2) higer pressure test available on request 1664 mm PHYSICAL FEATURES Material Body diameter Total length Wheel carriage Wheel diameter Weight stainless steel, brass and aluminium 40 mm 1664 mm (without rod connecting device) pair of wheels mounted on long-life sealed ball bearings 32 mm 5.4 kg (probe only) 42 mm T-REX INCREMENTAL EXTENSOMETER 4

5 ARCHIMEDE READOUT ARCHIMEDE is a rugged, water-resistant portable readout designed to read the T-Rex extensometer and inclinometer probes. The readout has a large, daylight-readable graphic display capable of showing plots as well as data. A convenient handswitch allows one-man operation. For reliable daily operation, the readout connects to the probe or T-REX by cable. An external 12V battery pack is recommended when the Archimede is used with the T-REX probe, which has high power consumption. The external battery pack provides a working time of up to 8 hours. TECHNICAL SPECIFICATIONS PRODUCT CODE A/D converter Storage memory Resolution Accuracy Input impedance LCD color display Communication with pc/notebook Temperature operating range Case Dimensions and weight T-REX probe power supply Battery Operating time 0CDL300INCL 2 x 24 bit, with autocalibration 2 GB 100 μv with FS ±10 V 0.01% FS >10 MΩ for voltage <2.5 V 5.7 (320 x 240 pixel), sunlight readable USB 2.0, 1.0 Mbit / sec -20 C +60 C Crushproof ABS, IP x 280 x 75mm (LxWxH), 2 kg 24 V 12V Ah, Ni-MH approx. 8 hours (with additional battery pack) SURVEY AND PLOT At each depth, Archimede displays a reading in mm (the distance between the rings minus 1000mm), date, time, battery level, signal of each sensor in mv, survey direction, reading level and reference reading. High-resolution plots can be easily generated and displayed when the survey is finished. The SMART Manager Suite permits to manage ARCHIMEDE directly by your PC, offering also an on-line technical assistance. T-REX INCREMENTAL EXTENSOMETER 5

6 CONTROL CABLES Cables are used to control the depth of the probe and transmit readings from the T-REX to the readout. The cables are supplied on reels and include a factory-attached connector for the probe. Slip-ring reel allows the readout to remain connected while the reel is operated. Probe-end connectors are watertight to 20 bar. SLIP RING HD CABLE REEL 0S2RCS00000 HD CABLE REEL 0S2RC Slip-ring HD cable reel allows the Heavy Duty cable has a stainless readout to remain connected while steel core wire to control stretching the reel is operated. and a stainless steel torsion braid to prevent twisting. Cable jacket has copper depth marks. Cable lengths 50,100,150,250 m 30,50,60,100,150,200 m Conductors layout 6x0.50 mm 2 6x0.50 mm 2 Depth tactile marks copper, every 500 mm copper, every 500 mm Slip ring HD cable reel 0S2RSC00000 Stress member steel core steel core Max strength 500 kg 500 kg Outer jacket yellow, polyurethane yellow, polyurethane Cable diameter 10.4 mm 10.4 mm Weight (cable+marks) 0,150 kg/m 0,150 kg/m Total weight with 50 m cable 14 kg 12 kg CALIBRATION DEVICE The calibration device (product code 0REX0CAL0FR) is used to check the calibration of the probe in the office before and after surveying. The calibration device is mostly ceramic with a low thermal coefficient of expansion. It is supplied with two magnetic rings and support legs. One ring is fixed to the tube, the other one can be moved in a range of ±25 mm. The calibration device is supplied with aluminium carring case. Probe and calibration device should be at 20 C ±1 C for calibration. T-REX INCREMENTAL EXTENSOMETER 6

7 ACCESSORIES AND SPARE PARTS T-REX POSITIONING DEVICE 0REX0CS1000 SET OF 10 POSITIONING RODS 0REXROD10BX ANALYSIS SOFTWARE 0SWKLION000 Improves accuracy of vertical surveys. Required if measurements are critical. The positioning device has clamps for T-Rec top cap (product code 0REX0TS2350). The positioning rods are needed for horizontal measurement with T-REX system. The aluminum rods are 2 meters long and have nickel-plated connectors. Supplied with carrying bag. Klion Software processes measurements from T-Rex system, providing incremental or cumulative displacements. For more information refer to the relevant datasheet. REPLACEMENT CARRYNG CASE 0REX0CASE00 POSITIONING ROD 0REXROD2000 EXTERNAL 12V BATTERY PACK 0CDL012EXBP Replacement shock-resistance carring case for T-REX probe, made in aluminium. Aluminum rod, 2 meters long, with nickel-plated connectors. Used with Archimede readout to increase working time to 8 hours. Supplied with carrying case. T - Rex positioning device Archimede datalogger with carryng case external 12V battery pack slip ring cable reel T - Rex probe carryng case set of 10 positioning rods T - Rex probe T-REX INCREMENTAL EXTENSOMETER 7

8 MEASURING TUBES The T-REX probe operates in S141 inclinometer ABS casing with magnet target rings externally attached every meter. In vertical applications, the T-REX top cap is needed to holding the positioning device. For horizontal applications, Sisgeo suggest installing the lockable top cap on the accessible end of the tube. For further information refer to S141 casing datasheet. ABS INCLIN. CASING 0S Flush-coupled ABS inclinometer casing model S141, 3 m length, OD 70 mm, ID 59 mm. COUPLING 0S141TS7000 Self-aligning coupling for S141 flush inclinometer casings. OD 70 mm, length 200 mm. BOTTOM CAP 0S141TS7000 Simple bottom cap for Flush casings, made of ABS. Suitable for inclinometer column or extenso-inclinometer column. CASING ASSEMBLY KIT 0S1ABKIT200 Suitable for 100 m of ABS casings, it includes rivets, adhesive tape, selfamalgamating tape and drill bits. RING SETTING ROD 0REX0DIMA00 Setting rod for positioning the rings 1 m apart. LOCKABLE TOP CAP 0S100CH1000 Lockable cap for horizontal application with survey pin permits topographical surveying in order to define and check the borehole coordinates. MAGNET REFERENCE RING 0REX0RING93 T-REX TOP CAP 0REX0TS2350 Magnet ring for T-REX incremental extensometer OD 93 mm, ID 71 mm. Material: PVC with permanent magnet Lockable top cap for vertical application ready with fixing plate for T-REX positioning device. T-REX INCREMENTAL EXTENSOMETER 8

9 3-D (INCLINOMETER AND EXTENSOMETER) SURVEY IN TUNNEL APPLICATION Slip ring HD cable reel Archimede datalogger T - rex positioning device tunnel in construction magnet ring T-Rex probe bottom cap T-REX INCREMENTAL EXTENSOMETER 9

10 TUNNEL FACE EXTRUSION T-REX incremental extensometer is often used in tunneling to monitor the tunnel face detensioning and ground displacement vs distance from the face. The system consists of a measuring tube with pre-attached magnet target rings installed in a horizontal borehole drilled from the tunnel face. Usual tube lengths are 15 m to 30 m. The probe is inserted in the tube and pushed to reach the farthest magnetic ring. The first survey will give the zero position of all the magnetic targets. Subsequent surveys are performed after each tunnel excavation step (the exposed portion of the tube is destroyed at each step). These surveys are compared to the reference survey to calculate displacement of the face. TUNNEL IN CONSTRUCTION Positioning rod Magnet ring T-Rex probe ABS measuring tube rod-probe connecting device Preparing T-REX probe for horizontal surveying All the information in this document is the property of Sisgeo S.r.l. and should not be used without permission from Sisgeo S.r.l. We reserve the right to change our products without prior notice. The datasheet is issued in English and other languages. In order to avoid discrepancies and disagreement on the interpretation of the meanings, Sisgeo Srl declares that English Language prevails. SISGEO S.R.L. Via F. Serpero 4/F Masate (MI) Italy Phone Fax info@sisgeo.com TECHNICAL ASSISTANCE SISGEO offers customers and phone assistance to ensure proper use of instruments and readout and to maximize performance of the system. For more information, us: assistance@sisgeo.com T-REX INCREMENTAL EXTENSOMETER 10