Geokon 4415 Manuel utilisateur
Instruction Manual
Model 4415
3D Mechanical Crackmeter
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.
Copyright © 2015-2018 by Geokon, Inc.
(Doc Rev B, 1/15/18)
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.
TABLE of CONTENTS
1. INTRODUCTION .................................................................................................................................................. 1
2. INSTALLATION INSTRUCTIONS .................................................................................................................... 1
3. TAKING READINGS............................................................................................................................................ 2
1
1. INTRODUCTION
The Geokon Model 4415 3D Mechanical Crackmeters is designed to measure movement across
joints such as the construction joints in buildings, bridges, pipelines, dams, etc.; tension cracks in
soils and joints in rock and concrete.
The 3D Mechanical Crackmeter is shown in Figure 1.
Figure 1 – Model 4415 3D Mechanical Crackmeter
It consists of a horizontal square bar that is anchored on one side of the crack and a three-sided
box, in which the end of the square bar nests, anchored on the other side of the crack.
The anchors are made from two lengths of #4 rebar, 4 inches long, grouted into boreholes drilled
on either side of the crack. The crackmeter will measure any widening of the crack and the extent
of any shearing movements in two directions. The measurements are made using a dial indicator.
When the crackmeter is shipped it is shipped with its two parts bolted together by two cap
screws. In addition, there are two, half inch thick, black, Delrin spacer blocks held in place to
keep the two parts of the crack meter at the correct distance apart ready for installation.
2. INSTALLATION INSTRUCTIONS
1) Position the crackmeter so that it spans across the crack, using the rebar lengths mark the
position of holes that need to be drilled.
2) Drill two, 5/8 inch to 3/4 inch boreholes, to the depth necessary to leave the crack meter at
the desire height above the surface.
3) Fill both holes with quick-setting grout and push the rebars into the grout-filled holes.
4) Wait for the grout to set up.
5) Unscrew the two cap screws and using a screwdriver push out the two black Delrin spacer
blocks. The crack meter is now ready to use.
2
3. TAKING READINGS
Readings are made by means of a dial indicator – the metric model is Model 1400-2-2 and the
English model is Model 1400-1-2.
1) Push the spring-loaded tip of the dial indicator through one of the three holes in the crack
meter. Push the tip in all the way until the collar of the dial gage rests firmly against the steel
surface of either the square bar or the three-sided box. [The hole in the square bar measures
vertical shear; one of the two holes in the three-sided box measures horizontal shear; and the
other hole, crack widening].
2) Record the reading of the dial indicator. This will be the initial reading against which all
subsequent readings will be compared so verify that the reading is correct.
3) Record the temperature – it could have an effect on the readings.
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