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1.Intended purpose
The dynamic plate load test with the help of the ZFG 3000 Light Weight Deflectometer is a
rapid method of determining the dynamic deflection modulus E
vd
[[MN/m²]. This allows
conclusions to be made about the load-bearing capacity and compaction of soils.
In accordance with German regulations TP BF-Stb Part B8.3, the procedure can be used on
mixed-grained and course-grained soils up to a grain size of maximum 63 mm, loose base
courses, backfill material and for soil improvement. It is used in civil and road construction. It
is ideal for documentation, self-monitoring and preparing reports.
The Light Weight Deflectometer can be used alternatively to a static plate load device
according to DIN 18 134, and has the following benefits:
- no necessity for a loaded truck as a required counter balance in the static plate bearing test or
the tripod required for settlement measurement
- testing facilities in restricted space, for example during rail track construction, trench
backfilling, for general backfill, in boreholes or other locations with difficult access
- low space requirements and low test equipment weight
- low time requirements for testing - around 3 minutes for each measuring point
2. Preparation for measurement
Prepare a measurement by applying the load plate all-over the test area by rotating and
pushing. Ensure that there are no hollows underneath the load plate. In this case, fill the
hollows with dry medium sand.
The settlement gauge and the loading plate are each fitted with a socket, into which the
measuring cable is plugged to connect the devices. Now place the loading device on the
loading plate. Remove the transport safety device from the drop weight.
To prevent any damage, it is necessary to ensure proper locking of the transport lock
The test area must be pre-loaded with 3 drops. To do this, raise the drop weight and engage
the release mechanism. Once you have aligned the guide rod vertically the drop weight should
be released, then raise again using the catch handle after the rebound, and engage in the
release mechanism once again.
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