LABORATORY VANE SHEAR (MOTORISED)

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 mean of a lead screw rotated by a drive wheel to enable the vane to be lowered in to the specimen.
• Rotation of vane is by means of a hand wheel which operates a worm gear arrangement turning the upper end of a calibrated torsion spring.
• 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 should also supplied with set of springs one each approx. 2 kg-cm, 4 kg-cm and 8 kg-cm in a wooden carrying case preferably electrically operated, rate of rotation is 1/16 RPM.
• Suitable for operation on 230V, 50 Hz, Single phase, AC supply.