| Bearing
Value |
| The
C.B.R. test is used for determining the relative bearing ratio and expan-sion
characteristics of base, sub-base and sub grade soils for the design of
roads pavements and runways. Tests can be made on all types of soils including
sand gravel and washed stone (passing through 20mm IS sieve).The CBR test
is used extensively in selection of materials and control of sub grades.
|
| Model
No. |
Description
(Sizes) |
Display |
| I
17 |
CALIFORNIA
BEARING RATIO TEST APP. (LAB. MODEL):IS 2720
Load
frame hand operated OR electrical capacity 5 tones.
CBR mould 150mm dia 175mm high complete with base plate and collar 150mm
dia & 50mm high. Made of steel OR Gun metal.
Penetration piston face dia 50mm
Bracket for penetration Dial gauge
Displacer block 148mm dia X 47.7mm
Surcharge weight 2.5 Kg. with a central hole
Surcharge weight 2.5 Kg. slotted
Surcharge weight 5 kg. with a central hole
Surcharge weight 5 Kg. slotted
Perforated Brass plate with locknut stem
Tripod; cutting collar
Rammer 4.89 Kg. and 450mm fall; Rammer 2.6 Kg. and 310mm fall
Dial gauge .01mm X 25mm travel
Proving ring duly calibrated from NCB/NPL. |
|
| I
17.1 |
CALIFORNIA
BEARING RATIO TEST APPARATUS (FIELD TYPE)
One
loading jack capacity 10,000 kg, along with swivel head, one penetration
piston, machined and hardened 50mm dia, threaded at the top end to connect
to extension rods, Extension set consisting of 2 lengths 5 cm; 2 lengths
10cm;1length 30cm;1 length 50cm; 1 length 100cm used as spacers between
the proving ring and penetration piston. Surcharge weight 5 kg 250mm dia
with central hole; surcharge weight 5 kg slotted; surcharge weight slotted
10 kg. Proving ring 100 KN capacity; one dial gauge .01mm |
|
| I
17.2 |
NORTH
DAKOTA CONE :(IS 2720 PART XXII)
Developed
by the North Dakota Highway department for use with a pavement design
method similar to that associated with the CBR test, this test is simpler
and more rapid than the latter and can be easily applied for insitu field
test.
The instrument consists of a rod carrying a loading platform at the top
and a hardened steel cone at the bottom. The rod is mounted vertically
and slides freely up and down in the collars of the frame and can be locked
in any position as required. The conical tip penetrates the soil through
an aperture in the cast iron base. The loading platform carries a graduated
plunger which enters one of the side supports and permits the reading
of the penetration.
|
|
| I
17.3 |
PROVING
RING PENTROMETER (VICKSBERG PENTROMETER)
This
is for determining the bearing capacity of sub-grades or for compaction
control. It also serves as a rapid means for determining the penetration
resistance of soils in shallow exploration work. It consists of a sturdy
handle under which is fixed a sensitive proving ring. An extension piece
is fixed on the bottom of the proving ring and carries the detachable
penetration cone at its tip. Proving ring indicates the penetration load
applied
|
|
| Plate
Bearing Test |
| The
plate bearing test essentially is a model test of foundations and gives
the stress strain characteristics for determining the ultimate bearing capacity
of foundations. This test is basic standard technique for determining bearing
capacity of soils and the results of other methods are compared and calibrated
with values obtained with plate bearing test. In this method a steel plate
is subjected to a gradual increment of load and the corresponding settlement
is noted. The ultimate bearing capacity is taken as the load at which the
plate starts sinking at a rapid rate. |
| PLATE
BEARING TEST APPARATUS. :(IS 1880) |
| Model
No. |
Description
|
|
| I
18 |
| 1 |
Hand
operated hydraulic jack with pressure gauge, capacity 50 tons., with
3 meter long metal tube with end coupling
|
|
| 2 |
Ball
and socket arrangement consisting of two steel plates one steel ball
|
=
1NO |
| 3 |
Extension
rod 12mm dia X 25cm long for taking dial gauge reading |
=
16NOS |
| 4 |
Magnetic
base with female thread on top for holding extension rod |
=
4NOS |
| 5 |
Top
end plate,50mm dia with male thread for fitting on the extension rods |
=
4NOS |
| 6 |
Column
15cm dia X 50cm long with flanges complete with four bolts and nut |
=
1NO |
| 7 |
Column
15cm diaX25cm long with flanges complete with four bolts and nuts |
=
2NO |
| 8 |
Datum
bar portable, total span 3mtrs.Height approx.30cm mounted on 2 legs |
=
1NO |
|
|
| |
ACCESSORIES/OPTIONAL
EXTRA
| a |
Grooved
M.S.Plate 30 cmsq
|
X 25mm thick |
| b |
Grooved
M.S.Plate 30 cmsq |
X 25mm thick |
| c |
Grooved
M.S.Plate 30 cmsq |
X 25mm thick |
| d |
Grooved
M.S.Plate 30 cmsq |
X
25mm thick |
| e |
Plain
M.S. Plate 30 cmsq |
X
25mm thick |
| f |
Plain
M.S. Plate 30 cmsq |
X 25mm thick |
| g |
Plain
M.S. Plate 30 cmsq |
X
25mm thick |
| h |
Plain
M.S. Plate 30 cmsq |
X 25mm thick |
|
|
| I
19 |
SWELL
TEST APPARATUS
It
is designed to determine the swelling pressure developed dry soil specimens
molded to desired densities at known moisture contents, when soaked in
water. The load applied to restrain the swelling is transferred to a load
measuring proving ring through a perforated swell plate and a load transfer
bar. The proving ring is attached to a lead screw of load frame hand operated,
designed for the purpose. The load frame has a worm and gear arrangement
for initial setting and for subsequent volume change compensation.
|
|
| STATIC
CONE PENTROMETER |
| The
static cone pentrometer test is also found to be handy tool for pre-determining
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 penetrated is also possible. To use the static cone
pentrometer truncated steel cone is forced verti-cally 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 at suitably
desired intervals, provide a continuous bearing capacity profile and hence
a shear strength profile of the soils at the location. |
| Model
No. |
Description
(Sizes) |
|
| I
20 |
STATIC
CONE PENTROMETER
The
drive is by means of a rack and pinion manually operated through a gearing
arrangement. The gear box and pinion are fixed on two upright pillars
and the movement is transferred to the pinion by means of two handles,
sprockets and chain arrangement. The movement of the rack is guided by
a bracket and two pillars.The penetration resistance i.e. the pressure
is indicated on hydraulic gauges through a hydraulic measuring head.
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