Intze tank design

Intze water tank design

1. DESIGN AND ANALYSIS OF AN INTZE TANK (A Case study for GRIET Campus) DEPARTMENT OF CIVIL ENGINEERING BY (BATCH-7) ABHISHEK.K(11241A0132) HEMANTH REDDY.Y(11241A0160) CHERUKU SRIKANTH(11241A0169) SUSHEEL CHOWDARY(10241A0182 ) PREM KUMAR.G(11241A0117) PROJECT GUIDE: Mr. S.VENKATA CHARYULU 1

2. ABSTRACT INTRODUCTION OBJECTIVES TYPES OF WATER TANKS INTZE TANK AND ITS CONSTRUCTION MATERIALS REQUIRED IN CONSTRUCTION STUDY FOR GRIET CAMPUS DESIGN THROUGH MANUAL PROCESS DESIGN THROUGH STAAD PRO CONCLUSIONS REFERENCES Contents 2

3. Due to enormous need by the public, water has to be stored and supplied according to their needs. Water demand is not constant throughout the day. It fluctuates hour to hour. In order to supply constant amount of water, we need to store water. So to meet the public water demand, water tank need to be constructed. Storage reservoirs and overhead tanks are used to store water, liquid petroleum, petroleum products and similar liquids. The force analysis of the reservoirs or tanks is about the same irrespective of the chemical nature of the product. All tanks are designed as crack free structures to eliminate any leakage. This project gives a brief study of design and analysis of an Intze water storage tank for GRIET campus using working stress method and STAAD pro. ABSTRACT 3

4. A water tank is used to store water to tide over the daily requirement. In the construction of concrete structure for the storage of water and other liquids the imperviousness of concrete is most essential. Design of liquid retaining structure has to be based on the avoidance of cracking in the concrete having regard to its tensile strength. Cracks can be prevented by avoiding the use of thick timber shuttering which prevent the easy escape of heat of hydration from the concrete mass the risk of cracking can also be minimized by reducing the restraints on free expansion or contraction of the structure. INTRODUCTION 4

5. 1. To make a study about the existing supply of water and need for water storage in GRIET campus. 2. To calculate the forces and stresses acting on Intze water storage tank. 3. To make a study about the guidelines for the design of liquid retaining Structure according to its code. 4. To Design and analyze water tank structure using manual method and STAAD pro software. OBJECTIVES: 5

6. 1. CLASSIFICATION BASED ON POSITION: Tanks resting on ground Underground water tanks Elevated water tanks 2. CLASSIFICATION BASED ON SHAPE: Circular tanks Rectangular tanks Intze tanks Spherical tanks Conical bottom tanks PSC tanks WATER TANKS 6

7. Elevated rectangular water tank Tank resting on ground Spherical tank Conical bottom tank 7

8. INTZE TANK 8

9. The name “Intze” is given by a German hydraulic engineer OTTO INTZE(1843-1904) Intze Principle for water towers: A water tower built in accordance with the Intze Principle has a brick shaft on which the water tank sits. The base of the tank is fixed with a ring anchor made of iron or steel, so that only vertical, not horizontal, forces are transmitted to the tower. Due to the lack of horizontal forces the tower shaft does not need to be quite as solidly built. This type of tank was first used in Germany between 1885 and 1905. HISTORY OF INTZE TANK 9

10. A water tank built in accordance with the Intze principle has brick shaft on which the water tank sits. In Intze tank we provide a domed floor so that the domed floor balances the horizontal thrust coming from the conical slab. Due to lack of horizontal forces the tower shaft does not need to be solidly built. A ring beam has to be provided to support the dome. This ring would be supported by columns. This dome balances the horizontal force and make it economical when compared to normal tanks. Construction 10

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13. CONCRETE STEEL WATER PROOFING MATERIALS MINIMUM REINFORCEMENT MATERIALS REQUIRED: 13

14. M20 grade concrete is used for construction. High quality Leak proof Should not crack CONCRETE 14

15. Permissible stresses should not exceed the limit Permissible stress in direct tension=1000kg/cm 2 Tensile stress in bending =1000 to 1200 kg/cm 2 STEEL 15

16. 0.3% of gross cross sectional area must be provided up to 100mm thickness 0.2% of gross cross sectional area for 100-450mm thickness 0.2% of gross cross sectional area should be provided for >450mm thickness in each direction 0.12% should be provided in foundations Minimum Reinforcement 16

17. The objective of using them is to fill the pores of concrete and to obtain a dense and less permeable concrete. Commonly used water proofing material is HYDRAULIC LIME. Other agents like chalk, sodium silicate zinc sulphate, calcium chloride etc.., are used. Water Proofing Materials 17

18. GRIET campus uses water coming from bore well and also water tankers for daily use. It converts some amount of water to drinking water through mineral water plant available at the back of block-2. College has a major underground water tank of 1 lack liters capacity which is filled by tankers and also through the bore well working at Ganges valley school. Water is pumped through this tank for all blocks including pharmacy through two motors of 7.5hp and 5hp. Study for GRIET campus: 18

19. Population Of GRIET As per IS code for Institutional per capita demand Total demand of water 5000 56.5liters 282500 Water demand for GRIET: Tanks present for storage capacity Main underground water storage tank 100000lt Block-1 19000lt Block-2 13000lt Block-3 50000lt Block-4 25000lt 19

20. Because of power crisis, improper functioning and delay of water tankers and poor availability of ground water in this area there is a huge crisis for water in our campus. As the campus is increasing in facilities and growing its capacity by implementing new courses and blocks which leads to the increase in demand of water. So, there is a need for the proper storage and optimum utilization of water for the future use. Hence constructing an elevated Intze water storage tank at proper area would be most preferable to meet the future need of water demand. 20

21. Proposed site for Intze water tank 21

22. STAAD PRO: Structural Analysis And Design developed by Bentley is most commonly used software for quick analysis and design of water tank. It uses Finite element analysis to analyze any structure which is the best method to analyze easily and in less time. Software used: 22

23. Capacity -750000liters Staging part -16m Grade of concrete used – M20 Steel – HYSD 415N/mm 2 Dome: Generally Dome is spherical in shape the rise of the dome is taken from 1/4 th to1/6 th of its span and thickness of dome slab is taken from 100 to 150 mm thick. Design Data 23

24. Top dome Top ring beam Cylindrical wall Bottom ring beam Conical dome Bottom spherical dome Bottom circular girder Staging portion 1.columns 2.Bracings Foundation Elements of the tank: 24

25. Member loads Top dome Self weight, live load, finishes Top ring beam Hoop tension, weight of top dome, self weight Cylindrical wall Water pressure, Vertical load, hoop tension, self weight Bottom ring beam Vertical load, tension due to vertical loads, hoop tension Conical dome Water pressure, vertical load, hoop tension Bottom spherical dome Total weight of water, self weight Bottom ring girder Vertical loads, weight if dome Columns Vertical load due to tank, wind forces, self weight of bracings Loads acting on each member of the tank 25

26. DIMENSION LENGTH(m) Diameter of tank 12 Height of cylindrical portion 8 Depth of conical dome 2 Diameter of supporting tower 8 Spacing of bracings 4 Obtained dimensions: 26

27. Member Size or Dimensions Top dome 100 mm thick Top ring beam 300mmx300mm Cylindrical wall Thickness of 200mm at top and 400mm at bottom Bottom ring beam 1200mm wide and 600mm deep Conical dome 600mm thick Bottom ring girder 600mm wide and 1200mm deep Columns Circular columns of 650mm dia Bracings 500mmx500mm Details of different parts of the tank obtained through manual design 27

28. Dimensions of the tank : 28

29. Reinforcement details: 29

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31. Design through STAAD: 31

32. 3d view and with full sections: 32

33. Assigning dead loads: 33

34. Live load: 34

35. Nodal deflections: Analysis drawings: 35

36. Bending moments of beams 36

37. Max absolute and max principle stresses in plates: 37

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39. Top ring beam: Reinforcement details: 39

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41. Both manual design and STAAD deigns are analyzed for the same loading conditions. First manual calculations are calculated and then these dimensions are taken in STAAD analysis. Results shown that no member fail and the design is stable. The reinforcement details of STAAD doesn’t give much economical design. So the manual design is adopted for the construction of tank. Conclusions: 41

42. A parametric study of an Intze type of tank paper given in international conf of structural and civil engineering by M.K. Sharma, Z. Ahmed, P. Bhardwaj and S.Choudhury . Design of Intze Tank in Perspective of Revision of IS: 3370 by Ranjit Singh Lodhi , Dr. Abhay Sharma, Dr. Vivek Garg ( International Journal of Scientific Engineering and Technology Volume No.3 Issue No.9, pp : 1193-1197). Some aspects in analysis of Intze type water tank by I. Rajendran. Structural design and drawing by N. Krishna raju. IS-456:2000 for design of concrete IS-3370- 1965 for design of water retaining concrete structures References: 42

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