Appendix D. 3D Monitoring; Array Of 3 Crackmeters; Installing The 3D Array; Figure 13: Typical 3D Array - Top View - Geokon 4420 Series Instruction Manual

APPENDIX D. 3D MONITORING

D.1 ARRAY OF 3 CRACKMETERS
Monitoring crack movements in three dimensions requires an array of three
4420 crackmeters, one each for monitoring the X, Y, and Z dimensions.

FIGURE 13: Typical 3D Array - Top View

FIGURE 14: Typical 3D Array - Front View

Range 9: 'A' Length @ Midrange
25 mm (1") 342.90 mm (13.50")
50 mm (2") 396 mm (15.625")
100 mm (4") 554.81 mm (21.843")

TABLE 9: 3D Array, Typical Version

The ends of the crack meters are fixed on each side of a fissure by means of a
bracket or by direct mounting using expansion anchors.
D.2 INSTALLING THE 3D ARRAY
ANCHOR SPACING
For spacing distances, refer to Table 1 in Section 2.2.1. When setting the gauge
position using a portable readout, refer to Table 1 in Section 2.2.1 to determine
the proper position.
MODEL 4420 VIBRATING WIRE CRACKMETER | 3D MONITORING | 21
'B' Height 'C' Length 'D' Dimension
384.56 mm 558.80 mm 34.93 mm
(15.14") (22") (1.375")
489.28 mm 612.78 mm 60.33 mm
(19.263") (24.125") (2.375")
701.88 mm 770.71 mm 111.13 mm
(27.633") (30.343") (4.375")
13:
14:
'E' Dimension
28.58 mm
(1.125")
53.98 mm
(2.125")
104.78 mm
(4.125")