IS 4656 -1968 Code Book PDF free download
This Indian Standard was adopted by the Indian Standards Institution on 23 May 1968, after the draft finalized by the Construction Plant and Machinery Sectional Committee had been approved by the Civil Engineering Division Council. Form vibrators are generally used for compaction of concrete in precast concrete molds, such as pipes, gullies and deep post-pensioned beams. They are also used for compaction of in-suit concrete in small and narrow sections or very heavily reinforced sections where immersion vibrators can not be used. Form vibrators are generally powered by electric or air motor and are of two types, namely ‘ the fixed or clamp type ’ and ‘ the manual type ‘. The clamp type is mostly used although hand held type is also sometimes used in situations where there are no means of fittings the clamps or where continuous movement along the forms is desirable. The fixed type is always directly coupled with the prime mover unit whereas the manual type is either directly coupled to the prime mover or is connected to the primer mover through a flexible shaft drive. This standard covering electrically operated, fixed and manual type form vibrator has been prepared with a view. to providing guidance to the manufacturers and users in obtaining form vibrators capable of giving satisfactory service. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960*. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.
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