Geokon 4400 Manuel utilisateur

Instruction Manual

Model 4400

V W Embedment Jointmeter

No part of this instruction manual may be reproduced, by any means, without the written consent of

Geokon, Inc.

The information contained herein is believed to be accurate and reliable. However, Geokon, Inc. assumes

no responsibility for errors, omissions or misinterpretation. The information herein is subject to change

without notification.

(Doc Rev J, 11/10/16)

Warranty Statement

Geokon, Inc. warrants its products to be free of defects in materials and workmanship, under

normal use and service for a period of 13 months from date of purchase. If the unit should

malfunction, it must be returned to the factory for evaluation, freight prepaid. Upon examination

by Geokon, if the unit is found to be defective, it will be repaired or replaced at no charge.

However, the WARRANTY is VOID if the unit shows evidence of having been tampered with or

shows evidence of being damaged as a result of excessive corrosion or current, heat, moisture or

vibration, improper specification, misapplication, misuse or other operating conditions outside of

Geokon's control. Components which wear or which are damaged by misuse are not warranted.

This includes fuses and batteries.

Geokon manufactures scientific instruments whose misuse is potentially dangerous. The

instruments are intended to be installed and used only by qualified personnel. There are no

warranties except as stated herein. There are no other warranties, expressed or implied, including

but not limited to the implied warranties of merchantability and of fitness for a particular purpose.

Geokon, Inc. is not responsible for any damages or losses caused to other equipment, whether

direct, indirect, incidental, special or consequential which the purchaser may experience as a

result of the installation or use of the product. The buyer's sole remedy for any breach of this

agreement by Geokon, Inc. or any breach of any warranty by Geokon, Inc. shall not exceed the

purchase price paid by the purchaser to Geokon, Inc. for the unit or units, or equipment directly

affected by such breach. Under no circumstances will Geokon reimburse the claimant for loss

incurred in removing and/or reinstalling equipment.

Every precaution for accuracy has been taken in the preparation of manuals and/or software,

however, Geokon, Inc. neither assumes responsibility for any omissions or errors that may appear

nor assumes liability for any damages or losses that result from the use of the products in

accordance with the information contained in the manual or software.

CONTENTS

1. INTRODUCTION...........................................................................................................................................1

2. INSTALLATION.............................................................................................................................................2

2.1. PRELIMINARY TESTS ...................................................................................................................................2

2.2. EMBEDMENT JOINTMETER INSTALLATION...................................................................................................2

2.2.1. Installing the Socket............................................................................................................................2

2.2.2. Installing the Jointmeter.....................................................................................................................3

2.2.3 Setting the Initial Rreading.................................................................................................................4

2.3. CABLE INSTALLATION ................................................................................................................................5

2.4. ELECTRICAL NOISE.....................................................................................................................................5

2.5. INITIAL READINGS.......................................................................................................................................5

3. TAKING READINGS.....................................................................................................................................6

3.1. OPERATION OF THE GK-403 READOUT BOX...............................................................................................6

3.2 OPERATION OF THE GK-404 READOUT BOX ................................................................................................6

3.3. MEASURING TEMPERATURES......................................................................................................................7

4. DATA REDUCTION......................................................................................................................................8

4.1. DEFORMATION CALCULATION....................................................................................................................8

4.2. TEMPERATURE CORRECTION ......................................................................................................................9

4.3. ENVIRONMENTAL FACTORS......................................................................................................................10

5. TROUBLESHOOTING................................................................................................................................11

APPENDIX A - SPECIFICATIONS...............................................................................................................12

A.1 MODEL 4400 EMBEDMENT JOINTMETER...................................................................................................12

A.2 THERMISTOR (SEE APPENDIX BALSO).......................................................................................................12

APPENDIX B - THERMISTOR TEMPERATURE DERIVATION............................................................13

LIST of FIGURES, TABLES and EQUATIONS

FIGURE 1-MODEL 4400 VIBRATING WIRE EMBEDMENT JOINTMETER .................................................................. 1

FIGURE 2-SOCKET INSTALLATION......................................................................................................................... 2

FIGURE 3SHOWING PIN ENGAGED IN SLOT............................................................................................................ 3

FIGURE 4–COMPLETED EMBEDMENT JOINTMETER INSTALLATION....................................................................... 4

EQUATION 1-DIGITS CALCULATION...................................................................................................................... 8

EQUATION 2-DEFORMATION CALCULATION......................................................................................................... 8

TABLE 1-ENGINEERING UNITS CONVERSION MULTIPLIERS .................................................................................. 8

EQUATION 3-THERMALLY CORRECTED DEFORMATION CALCULATION................................................................ 9

EQUATION 4-THERMAL COEFFICIENT CALCULATION ........................................................................................... 9

TABLE 2-THERMAL COEFFICIENT CALCULATION CONSTANTS ............................................................................. 9

EQUATION 5-GAGE LENGTH CORRECTION............................................................................................................ 9

TABLE A-1 EMBEDMENT JOINTMETER SPECIFICATIONS....................................................................................... 12

EQUATION B-1 CONVERT THERMISTOR RESISTANCE TO TEMPERATURE............................................................. 13

TABLE B-1 THERMISTOR RESISTANCE VERSUS TEMPERATURE ........................................................................... 13

1. INTRODUCTION

Geokon Model 4400 Vibrating Wire Embedment Jointmeters are intended primarily for the

measurement of joint openings between lifts or sections in mass concrete or across fracture

zones in fully grouted boreholes.

The instrument consists of a vibrating wire sensing element in series with a heat treated,

stress relieved spring which is connected to the wire at one end and a connecting rod at the

other. As the connecting rod is pulled out from the gage body, the spring is elongated

causing an increase in tension and a resulting change in frequency of the vibrating wire

sensing element The tension in the wire is directly proportional to the extension, hence, the

opening of the joint can be determined very accurately by measuring the frequency change

with the vibrating wire readout box. The unit is fully sealed and operates at pressures of up

to 250 psi.

Alignment Slot

Alignment Pin

Socket Socket Thread

Transducer Shaft Transducer Housing Tripolar Surge Arrestor Seal Screw

Coil Assembly Instrument Cable

16.093"

Gage Connector

Universal Joint

Gage End Flange

Connector Alignment Pin Swagelok Fitting

Transducer Wires

(2 places)

Protective PVC Gage Housing

408.8mm

Figure 1 - Model 4400 Vibrating Wire Embedment Jointmeter

In use, a socket is placed in the first lift of concrete and, when the forms are removed, a

protective plug is pulled from the socket. The gage is then screwed into the socket, extended

slightly and then concreted into the next lift. Any opening of the joint is then measured by

the gage which is firmly anchored in each lift. The sensing gage itself, is smaller than the

protective housing, and a degree of shearing motion is allowed for by the use of universal

ball-joint connections on the gage.

A thermistor is also located inside the vibrating wire transducer housing for the measurement

of temperature at the jointmeter location. In addition, a tripolar plasma surge arrestor inside

the housing provides protection for the sensor coils from electrical transients such as may be

induced by direct or indirect lightning strikes.

17.37 “

441m

2. INSTALLATION

2.1. Preliminary Tests

Upon receipt of the instrument, the gage should be checked for proper operation (including

the thermistor). See Section 3 for readout instructions. In position "B" the gage will read

around 2000 when the threaded connector is pulled out approximately 3 mm (0.125"). Do

not extend the connector more than the range of the gage. The threaded connector on the

end of the gage should not be turned independently of the gage body.

Checks of electrical continuity can also be made using an ohmmeter. Resistance between the

gage leads should be approximately 180 , ±10 . Remember to add cable resistance when

checking (22 AWG stranded copper leads are approximately 14.7/1000' or 48.5/km,

multiply by 2 for both directions). Between the green and white should be approximately

3000 ohms at 25° (see Table B-1), and between any conductor and the shield should exceed 2

megohms.

2.2. Embedment Jointmeter Installation

The installation of the Vibrating Wire Embedment Jointmeter consists of two stages; first,

installing the socket and, second, installing the gage.

2.2.1. Installing the Socket

The socket of the gage is meant to be installed in the first lift of concrete. The socket comes

with a PVC plug held in place by two O’rings. This plug is designed to keep concrete from

entering the inside of the socket and to hold the socket in place while the concrete is poured.

After installation the face of the socket must coincide with the finished face of the concrete if

it is to be accessible. If the socket plug is removed and needs to be replaced it will be

necessary to temporarily remove the socket plug bolt so that the air inside the socket can

escape when the plug is forced back into the socket..

Figure 2 - Socket Installation

The protective socket plug is supplied with a ¼-20 x 1 inch bolt which can be used to bolt the

socket to the forms. See Figure 2.

2.2.2. Installing the Jointmeter.

1. After the forms have been stripped and socket exposed, the socket plug should be

removed using the socket plug bolt or, if necessary, one of the eyebolt supplied. The

bore of the socket is supplied covered with O’lube to facilitate the assembly. Make sure

that the inside of the socket is clean and greased before proceeding.

2. Before pushing the jointmeter into the socket, make sure that the pins in the

connector engage the slots in the plastic housing. (See Figure 3). This is very

important.

Figure 3 Showing Pin Engaged in Slot

3. Remove the seal screw from the cable end flange. See Figure 1. This allows air to enter

the inside of the jointmeter while it is being adjusted.

4. Push the gage into the socket until it stops. While applying an inward pressure, rotate

the gage in a clockwise direction, for approximately 4 revolutions until the connection is

snug in the socket thread. Note: If the stiff direct burial cable is being used, the cable

bundle or reel should also be rotated to avoid crimping the cable. Again, it is very

important that the pins in the connector are inside the slots of the PVC housing. If

the pins are not in the slots and the jointmeter is twisted the jointmeter will be

broken.

5. The next step is to secure the gage body and cable in position for placing concrete.

Readings should be taken on the gage (and thermistor) at this time (see Section 3).

2.2.3 Setting the Initial Rreading

2.2.3.1 Models 4400 –25, 4400-50, 4400-100, 4400-150

To allow for slight compression of the gage, it is recommended that the gage be pulled out

until a reading of 3000-3500 in position 'B' is obtained. This will set the gage at

approximately 25% of its range in tension. It should be remembered that the gage should not

be rotated after pulling it from the socket. After extending the gage, wrap 2-3 layers of

electrical tape around the gage tube immediately adjacent to the socket to hold the gage at

this reading while the concrete is being placed. If the gage has to be removed from the

socket, it MUST be pushed back in until the pins catch and then rotated counter-clockwise

until it comes loose.

2.2.3.2 Model 4400-12

The above procedure for the longer range models is not recommended for the 4400-12

model. Here the danger of over-ranging the sensor due to the sudden release, when pulling

the gage out, is too great. So leave the transducer as is. The natural compression of the gage a

will be enough to allow for any small amount of joint closure.

6. Don’t forget to re-install the 10-32 3/8" seal screw into the gage end flange.

Figure 4 – Completed Embedment Jointmeter Installation

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