LABORATORY VANE SHEAR APPARATUS (HAND OPERATED)

AS PER IS: 2720 (Part XXX) - 1968.

Introduction:

VANE SHEAR: Soft and sensitive soils whose shear strength is less than 15 KN/m2, the results are dependent on operator’s skill. Even pushing the sample tubes in soil may cause some disturbance. Experience shows that carefully controlled compression tests results can be related to figures obtained by pushing a small vane in the soil and rotating it at a controlled rate and measuring the force, required for maximum resistance. Vane Shear Test can be conducted in a laboratory or in the field.

General Description and Specifications: Consists of

• A torque head adjustable in height by means of a lead screw rotated by a drive wheel to enable the vane to be lowered into the specimen.
• Rotation of the vane is by means of a hand wheel which operates a worm gear arrangement during the upper end of a calibrated torsion spring. Vane dia, rod dia, vane size & vane height are as per IS specifications.
• The Vane shaft is attached through the hollow upper shaft to a resettable pointer, which indicates the angle of torque on a dial graduated in degrees.
• The dial reading multiplied by spring factor gives the torque.
• A container for soil sample is also supplied, and a sampling tube of 38 mm I.D. & 150 mm long can also be used as container.
• Supplied with set of four springs, one each of approx. 2kg.cm, 4kg.cm, 6kg.cm, and 8kg.cm.
• Complete as above in a wooden carrying case.