25 Revision 33 October 2022
8. Post and Foundation soil test Procedure
8.1 Procedure
1. The test should be applied in the direction it would be loaded in service. In
the case of double sided barrier, the load should be applied in the directio
n
o
f the weakest side of the foundation.
2. Check that the gauge is in calibration and the certificate is available.
3. Locate the reaction vehicle in a suitable position. The reaction vehicle can
be any suitable vehicle or piece of plant weighing not less than 3 tonnes a
n
Orteco rig is adequate. Packing may be required to provide a suitable flat
surface to push against. (See Diagram 1 on page 26)
4. Connect the hydraulic pipes to the cylinder ram (A) and the pump (B).
5. Fit the appropriate post top box (C) or post push guide (D) to the cylinder
ram.
6. If required fit the extension rod or tube (E) on the other end of the cylinder
ram.
7. Place the post box or post guide on the post and position the other end of
the assembly against the reaction vehicle or packing, ensuring that the
cylinder ram is horizontally level.
8. After checking that the pump is in push mode, gently pump until the
assembly is wedged in place, but the pressure on the pump gauge still
reads zero.
9. Check that the ram will push against the post centrally and is still level
horizontally.
10. Install the datum peg (F) in a direct line from the ram and post.
11. Measure the height of the ram in accordance with the 1.5 metre setback
rules (diagram 2 on page 26), then using height to pressure loading chart on
page 27 to determine what pressure to pump to, to achieve the desire
d
b
ending moment.
12. Record the measurement from the datum peg to the post at a height of
610mm. The 610mm height is determined in accordance with the 1.5 metre
setback rules (diagram 2 on page 26).
13. Gently apply load using the pump until the gauge reads 1 kN (1000 N).
14. Record the new measurement between the datum peg and the post.
15. Increase load in 1 kN increments and record findings until
(a)
T
he required bending moment is achieved.
(b) The post deflection exceeds the permitted allowance.
(c) The plastic moment of the post is reached without any lateral movement
of the foundation.
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