Our Soil Testing Machines will never let you down in
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Pressure System, Compaction Test Apparatus Cone Penetrometer Method,
Consolidation Apparatus and other durable machines.
IS: 4968 (Part III)-1976
Features
- Provides essential information for Foundation
- Engineers Reduces cost of expensive boring and sampling
- Precise control for sounding speed (Engine Driven Model)
Extensive use of Static Cone Penetrometer originated in Holland where
buildings are constructed in areas mostly reclaimed from the sea-bed. In the
recent past, a number of research projects in the country have been
undertaken in order to correlate Static Cone Test results with the Standard
(Dynamic) Penetration Test results, resulting in widely different
correlation factors depending upon local geological history. The Static Cone
Penetration Test is also found to be a handy tool for predetermining the
length and estimating the load carrying capacities of piles passing through
soft compressible strata and resting upon hard clays, sands or gravel. The
penetration resistance of the cone has nearly the same value as the load
which can be carried by the actual pile per unit area of the pile tip. By
using the additional friction jacket with the standard equipment,
identification of various soil types is also possible.
To use the Static Cone Penetrometer, a truncated steel cone (60°
angle, 10 cm2 at base) is forced vertically into the soil by static thrust,
required to cause a bearing capacity failure of the soil immediately
surrounding the point where measurements are required to be made. Such
measurements made at suitably desired intervals, provide a continuous
bearing capacity profile and hence shear strength profile of the soil at the
sounding location. The cone point is advanced with a two rod system. The
outer casing protects the inner rod from soil friction and buckling. The
protected inner rod advances the cone during the sounding operation and the
pressure is measured on pressure gauges. The friction jacket helps in
obtaining additional information like static soil friction (skin friction)
against the steel sleeve. Two types of mantle tubes each 1 m long are
available. The mantle tube with uniform dia of 36 mm enables the
determination of total cumulative skin friction of the soil in addition to
the cone resistance. If however, cone resistance is the main requirement and
cumulative skin friction is not to be measured, then mantle tubes of
non-uniform dia are to be used. The judicious combination of both types of
tubes would be the ideal one, the number of each depending upon local
geological history.
IL - 543
Static Cone Penetrometer, 30 Kn (3000 kgf) capacity, Hand Operated IS:
4968 (Part 3)-1976 (Reaffirmed in 1987)
The drive is by means of a rack and pinion manually through a gearing
arrangement. The gear box and pinion are fixed on two handles, sprockets and
chain arrangement. The movement of the rack is guided by a bracket (attached
to the rack) and two pillars. The penetration resistance i.e. the pressure,
is indicated on hydraulic gauges through a hydraulic measuring head. Two
pressure gauges of 15 cm dia dial and capacities 0-160 kg/cm2and 0-60 kg/
cm2are provided. An automatic cut-off valve, to protect the low capacity
gauge from being overloaded, is provided. The valve can be adjusted and
locked at desirable values between 20 to 60 kg/cm2. A provision is made to
anchor the unit to the ground (with the help of four anchors supplied with
the unit) and there is a provision for lateral movement of the unit, so that
subsequent tests could be performed without shifting the entire anchorage. A
10-cm2-penetration cone with friction jacket is provided along with fifteen
mantle tubes (non-uniform) having an effective length of 1 m each with
sounding rods for finding out the cone (point) resistance or jacket
friction. It consists of :
More than 20% of India's surfacial deposits consist
of expansive black cotton soil having swelling pressure varying from 1
kg/cm2 to as high as 3.5 kg/cm2. These soil deposits heave considerably when
they get wet and lose shear strength. Thus it becomes important to know this
property of the swelling soil at a given site when projects on roads,
railways, irrigation, buildings, etc. are located. ILE provides the
instruments required for determining this parameter.
