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US 4,579,697 AGranted
Method for packing concrete cement utilizing a vibrator
OwnerKikumitsu Takanoinventor
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Abstract
A method and apparatus for curing concrete cement by packing the concrete with aid of a vibrator having a variable vibration speed. The vibration speed is selected according to the viscosity of the cement, as is the time period. The disclosed method and apparatus causes the cement to be uniformly settled and distributed throughout the objective space field.
Claims3
A method of packing contrete with a vibrator which has a selectable vibrational frequency, comprising the steps of:
- ascertaining the slump number of a body of unset concrete which is to be packed;
- vibrating the body of unset concrete at a relatively low vibriational frequency in the range of 1500 to 4500 vpm from externally of that body for a first time period in accordance with the ascertained slump number in order to pack a lower region of the body of unset concrete;
- then, vibrating the body of unset concrete at a relatively medium vibrational frequency in the range of 4500 to 7500 vpm from externally of that body for a second time period in accordance with the ascertained slump in order to pack a middle region of the body of unset concrete;
- and
- finally, vibrating the body of unset concrete at a relatively high vibrational frequency above 7500 vpm from externally of that body for a third time period in accordance with the ascertained slump number in order to pack an upper region of the body of unset concrete,
- said high vibrational frequency being higher than said medium vibrational frequency, and said medium vibrational frequency being higher than said low vibrational frequency.
3 more elements
Dependencies are inferred from the claim text.