Mackintosh Probe is usually used in preliminary soil investigation to acquire the untrained shear strength (directly through correlations) and consistency of the subsoil layering for very soft soils, sew et. Al (2000). Therefore, the application of this tool is very important to the construction world as it affects the whole construction of the structure.
There are many shapes and models of the
Mackintosh Probe but this research will be using the same model as Fakher et.
Al (2005) that consists of a 27.94 mm diameter cone with a 30o –apex angle;
12.7 mm diameter solid rods and a 4.5kg dead weight with a standard drop height
of 300mm as illustrated in Figure 49.
Figure: Mackintosh Probe in site
The
procedure of the old Mackintosh Probe is as follows:
o
Equipment for the
test is assembled. The cone diameter is measured in the SI unit.
o
The boring rods
and hammer are joint using rod coupling. Grease is swept up for easy
dissembles later.
o
Distance of 0.3 m
is measured and marked on the rod starting from the tip of the cone.
o
The equipment is
set up on the ground.
o
The hammer is
pulled up until it reached the maximum. The hammer is dropped freely to drive
the cone into the soil.
o
The sum of the
number of blows for each 0.3m penetration is recorded in the data sheet.
o
The rod will
continuously joint until :
§ The blow is more than 400 for 0.3m
penetration.
§ The depth reached 15m
o Pull the rods
using lifting tools after the penetration reached the requirement.
o The equipment is dissembled and cleaned
before storing
0 Comments