FIELD RELATIVE BEARING RATIO/ BEARING CAPACITY

Field California Bearing Ratio Apparatus
California Bearing Ratio Apparatus, Field Type
Ref. Standard :  IS: 2720 (Part 31)

EKE 155:

The use of the in-situ CBR apparatus in large road constriction project has increased considerably in the recent years. This apparatus mounted on a rolled steel joist cantilevered  from the back of the truck or fitted to the underside of a mobile frame, can be used to determine the bearing capacity of soils quickly and efficiently. This method of testing in-situ, using piston penetration, is useful for determining the load carrying capacity in the field, when the in-place density and water contents are such that the degree of saturation is 80% or greater, when the material is coarse grained and cohesionless so that it is not affected by changes in the water content when the material has been in-place.

It Consists of :

•  EKE 15501: Loading Jack, With  U-bracket, capacity 50 kN (5,000 kgf), This is specially designed for use with field CBR test apparatus, it consists of a hand operated, two speed, screw jack fitted with a U-bracket, A hexagonal adapter is provided to fix a proving ring, A thrust bar, which passes through the U-bracket, is screwed on to a proving ring (supplied at extra cost) which protects the proving ring when the loading is eccentric.

•  EKE 15502: Swivel Head for the Loading Jack
•  EKE 15503: Penetration Piston, 50 mm dia. threaded at the upper end, to connect to the various length of extension sleeves through a connector.
•  EKE 15504: Extension Set, Consisting  of 1 length of 5 cm, 2 lengths of 10 cm, 1 length of 30 cm, 1 length of 50 cm and a length of 100 cm used as spacers between the proving ring and penetration piston, the lengths are machined from steel tubing.
•  EKE 15505: Connector Set, Consists of eight connectors for coupling the penetration piston and proving ring assembly, either directly or through extension pieces.
•  EKE 15506: Datum Bar Assembly, Consisting of two stands and 1 m long Bar.
•  EKE 15507: Adjustable Bracket, For mounting the dial Gauge.
•  EKE 15508: Annular Metal Weight, 5 kg, 250 mm dia. with 53 mm dia. central hole.
•  EKE 15509: Slotted metal Weight, 5 kg, 215 mm to 250 mm dia. with 53 mm dia. slot.
•  EKE 15510: Slotted metal Weight, 10 kg 215 mm to 250 mm dia. with 53 mm dia. slot.

Optional Extras:
EKE  072: Dial Gauge , 0.01 x 25 mm
EKE 274: Proving Ring, 50 kN (5,000 kgf) Capacity

Plate Bearing Test
Plate Bearing Test Apparatus
Ref. Standard IS:1888

EKE 157:

The Plate Bearing Test is essentially a model test of foundations and gives the load deformation characteristics for determining the ultimate bearing capacity of foundations. This test is a standard technique for determining  for determining bearing capacity of soils and the results of other methods are compared and calibrated with the 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 settlement increases at a rapid rate.
 
The basic outfit consists of:

EKE 468: Hand Operated Hydraulic Jack, Capacity 500 kN (50,000 kgf)-One

EKE 475: Hydraulic hand Operated Pump, With 200 mm dia load Gauge  Capacity 500 kN (50,000 kgf) - oNEEKE 47503: High Pressure Flexible Metallic Hose, 5 m long-One
EKE 15702: Ball and socket Arrangement, Consisting of two steel plates, With one steel ball in-between the plates.- One
EKE 15703: Extension Rod, 12 mm dia. x 25 cm long, for taking dial Gauge readings, - Sixteen     
EKE 15704: Magnetic Base, with female thread on top, for holding extension rod,-Four
EKE 15705: Top End Plate, 50 mm dia. with male thread, for fitting on to the extension, rods and positioning the dial gauge plunger.-Four
EKE 15706: Column, 15 cm dia. x 25 cm long, with flanges, complete with four bolts and nuts,-Two
EKE 15707: Column, 15 cm dia. x 50 cm long, with flanges, complete with four bolts and nuts,-One
EKE 15708: Datum Bar, Light weight, portable, total span 5 m, height approx. 30 cm. Mounted on two removable legs, (it is made in two parts, provision exists for Datum bar of 2.5 m span to be used. A spare leg is provided for the purpose, Complete with two quick release clamps for positioning and holding the dial gauge brackets),Two
EKE 15709: Spikes-Ten
EKE 072: Dial Gauge, 25 mm travel, 0.01 mm least count.-Four

Note: As a wide range of bearing plates are manufactured , the customer is advised to select the plates from the following according to his specific requirements.

These are priced extra:
EKE 15710: Anchor Spike, for plate bearing test apparatus
EKE 15711: Quick Release Clamp, for positioning dia. gauge bracket
EKE 15715: Grooved MS Plate, 30 cm x 30 cm square x 25 mm thick.
EKE 15716: Grooved MS Plate, 45 cm x 45 cm square x 25 mm thick.
EKE 15717: Grooved MS Plate, 60 cm x 60 cm square x 25 mm thick.
EKE 15718: Grooved MS Plate, 75 cm x 75 cm square x 25 mm thick.
EKE 15721: Plain MS Plate , 30 cm x 30 cm Square x 25 mm thick
EKE 15722: Plain MS Plate , 45 cm x 45 cm Square x 25 mm thick
EKE 15723: Plain MS Plate , 60 cm x 60 cm Square x 25 mm thick
EKE 15724: Plain MS Plate , 75 cm x 75 cm Square x 25 mm thick

Note : 
1.    Grooved and plain plates of circular in shape can be supplied on request
2.    When a plate bigger than 30 mm square is used, a series of smaller plates should be used concentrically in order to reduce the deflection of the edges to plate resting on the soil and ensure proper distribution of the load on the bottom plate
3.    For carrying out actual tests on site, load trusses and soil anchors may be needed . These will be supplied at an extra cost.
 

Load Truss
Load Truss Capacity  200 kN (20,000kgf)

EKE 158:

This truss is of welded I-Girder construction in two halves which can be bolted together when required. The lower chord, the cross pieces for holding the truss down and the vertical thrust members are all of welded box type construction with two channels enclosed and welded to an I-girder. The anchorages are of a design tried out and perfected at the Central Building Research Institute, Roorkee. They  consist of semi-cylindrical pieces, each held down by 1 m long steel spikes, driven in through holes drilled in the semi cylinder. The spikes enter the ground at about 60° to the horizontal, four from each side spaced along the length of the anchorage. The cross pieces are moored to the anchorages by channel strap and bolts. Eight such anchorages are supplied with 200 kN truss. Guy wires with turn buckles are supplied to keep the truss erect.

Supplied complete with anchorages, guy wire and spikes as described above.

The equipment are supplied as follows:

Load Truss
Load Truss Capacity  300 kN (30,000kgf)

EKE 159:

This truss is of welded I-Girder construction in two halves which can be bolted together when required. The lower chord, the cross pieces for holding the truss down and the vertical thrust members are all of welded box type construction with two channels enclosed and welded to an I-girder. The anchorages are of a design tried out and perfected at the Central Building Research Institute, Roorkee. They  consist of semi-cylindrical pieces, each held down by 1 m long steel spikes, driven in through holes drilled in the semi cylinder. The spikes enter the ground at about 60° to the horizontal, four from each side spaced along the length of the anchorage. The cross pieces are moored to the anchorages by channel strap and bolts. Eight such anchorages are supplied with 300 kN truss. Guy wires with turn buckles are supplied to keep the truss erect.

Supplied complete with anchorages, guy wire and spikes as described above.

The equipment are supplied as follows:

Load Truss
Load Truss Capacity  500 kN (50,000kgf)

EKE 160:

This truss is of welded I-Girder construction in two halves which can be bolted together when required. The lower chord, the cross pieces for holding the truss down and the vertical thrust members are all of welded box type construction with two channels enclosed and welded to an I-girder. The anchorages are of a design tried out and perfected at the Central Building Research Institute, Roorkee. They  consist of semi-cylindrical pieces, each held down by 1 m long steel spikes, driven in through holes drilled in the semi cylinder. The spikes enter the ground at about 60° to the horizontal, four from each side spaced along the length of the anchorage. The cross pieces are moored to the anchorages by channel strap and bolts. Eight such anchorages are supplied with 500 kN truss. Guy wires with turn buckles are supplied to keep the truss erect.

Supplied complete with anchorages, guy wire and spikes as described above.

The equipment are supplied as follows: