06-03-2013, 09:36 AM
CRITERIA FOR DESIGN OF RCC STAGING FOR OVERHEAD WATER TANKS
CRITERIA FOR DESIGN.pdf (Size: 264.48 KB / Downloads: 586)
SCOPE
This draft standard lays down criteria for analysis, design and construction of reinforced cement concrete staging of framed type with columns or shaft type, for achieving a desirable level safety and durability of the supported liquid storage structure (container). Container may consist of any material like RCC, fiber concrete, ferrocement, steel, PVC, etc.
While the provisions of this standard refer to stagings for the storage of liquids, the recommendations are applicable mainly to water storage or containment. Additional requirements necessary for containment of liquids other than ordinary or plain water are beyond the scope.
The requirements given in this standard are not applicable for staging in reinforced masonry or un-reinforced masonry, may it be in concrete block, stone or bricks.
REFERENCES
The standards listed in Annex A, contain provision which through reference in this standard, constitute provisions of this standard. At the time of approval of this standard, the editions indicated are valid. All standards are subject to amendments and revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards being referred with their amendments.
TERMINOLOGY
For the purpose of this standard, the following definitions shall apply.
3.1 Capacity – Capacity of the tank shall be the volume of liquid it can store between designed full supply level (FSL) and lowest supply level (LSL that is, the level of the lip of the outlet pipe). Due allowance shall be made for applying lining, coating or plastering to the tank from inside if any, when calculating the capacity of tank. The designated capacity of tank excludes dead storage which is the quantity of liquid below lowest supply level (LSL).
CONCRETE
The requirements for concrete materials shall be governed by IS 456 for reinforced concrete, with the following additional requirement.
Use of aggregate having high porosity (>5%) shall be permitted only after establishing its parameters, long term influence on concrete and specifically effect on durability.