08-INFALL/OUT FALL REGULATORS



INFALL AND OUT FALL REGULATORS

1.SITE SURVEY

1) The site survey to be furnished as per check slip with the following details.

a) Report accompanying the site survey

b) HPs of canal.

c) LS of canal for a distance of 1KM

d) If the regulator is clubbed with a road bridge, mention the road level and type of bridge i.e. Single lane or Double lane bridge.

e) Salient features of Reservoir / Tank.

f) Bore Hole data / TPs upto Hard strata or for min. depth of 2m for shallow foundations with min. 3 Nos covering canal @ centre.( IRC 78: 2000)

2.DESIGN

Note on principles of Design, the assumptions made and the general features of the structure(IS 6531-1994; IS 7114-1993.)

The design shall be checked for the following two conditions:

1) canal full and reservoir/tank empty

2) canal empty and reservoir / tank full(IS 7784 ( part I ) - 1993)

HYDRAULIC DESIGN

i) Fixation of crest level, vent way calculations and crest width, Glacis profile with U/S & D/S slopes with radius of curve.

ii) The minimum thickness of pier shall be 1M to 1.5M Scour depth calculations:

R= 1.34 (q2/f)1/3 with relevant factor of safety.

If road bridge is combined also refer IRC code(IRC : 78-2000)

Energy Dissipation Calculation(IS 4997 - 1996 & CBIP No 179)

Hydraulic jump Calculation(IS 4997 - 1963 / 1996 & CBIP No 179)

Exit gradient calculations & cut - off

G E = (H/d)x [1/(π√λ)] ; Where λ = [1+ √(1+α2)]/2 ; α = b/d(CBIP - 12 & IS : 7114 - 1973.)

Uplift pressure Computations.

Design of impervious floor thickness as per Khosla's Theory Protection works

DESIGN OF SUPER STRUCTURE

1. DL Bridge     (or)(MOST Drawings  IRC: 51998, IRC : 6-2000, IRC : 212000)

2. SL Bridge     

3. Hoist Bridge Slab

The Top of Hoist bridge level shall be tentatively finalised considering crest level + 2 x Ht of Gate + free board (0.6 to 0.9m)
+ thickness of Hoist slab subject to confirmation of Mechanical Drawings.

4. Design of Bearings as given in MOST drawings(IRC : 83 (part II ) - 1997 )

5. Breast wall where ever necessary.(IS : 456 - 2000)

DESIGN OF SUB  STRUCTURE

1. Pier, Abutment, Wings & Returns : Minimum thickness of pier shall be 1.0 M to 1.5 M(IRC: 5-1998, IRC : 6-2000, IRC : 21-2000 & IRC : 78 - 2000. )

2.  Hoist platform (IS : 456 - 2000 )

3. Wings & Returns be designed adopting TVA procedure/Coulomb's Theory / Rankine's Theory adopting top width of 500mm.

4. Adequate gate grooves in pier and Abutment & provision of sill beam , embedded metal parts shall be made.( Hydro Mechanical Guide lines by CDO. )

5. Unless otherwise mentioned ,the grade of concrete shall be M10 for PCC & M20 for RCC.

6. A note shall be included duly mentioning that the groove sizes are indicative & a separate Hydro Mechanical drawing shall bereferred for details of EM parts & secondary concrete.

7.Infall Refulator shall be provided with double seals.

DESIGN OF FOUNDATIONS:

Foundations for Pier, Abutments, Wings & Returns.

i) For shallow & open foundations. (S : 1904 - 1986)

ii) For Raft foundations.(IS : 2950 - 1981 Part - I )

iii) For pile foundations(IS : 2911 - 1979 (Part - I,section 1,2,3,4)IS : 2911- 1980 ( part-II) , IS : 2911-1980 (part-III) , IS : 2911 -1985 (part - IV))

3.MISCELLANEOUS DETAILS:-

a) Weep holes in the Retaining walls

b) Bearings

c)  Expansion , Contraction & Construction Joints ((IS : 7784 (part I) :1993 IS : 3370 ( PART I) -1965, IS : 7784 (part II/ SECTIONIII):1996)

d) Size of grooves, hoist details, EM Parts, gates , slabs etc.,  gate shall be checked for the conditions  as mentioned in III (b)(Hydro mechanical guidelines by cdo)

DRAWING

a) General Plan & Sectional Elevation  - Plan indicating  Half plan @Top & Half plan @ foundation level,  LS along the canal & C/S across the canal (Scale : 1:50, 1:100, (or) 1:200)

b) Details of sections of Pier,Abutment, Wings  (Scale 1:25 (or) 1: 50 (or) any suitable scale. )

c) RCC details of deck slab, Hoist slab. (Scale 1:25 (or) 1: 20 (or) any suitable scale.)

d) The drawings shall contain assumptions made,TPs,Specifications, HPs of canal, salient features of river/ tank , bar bending schedule ( if applicable) , stress table etc

A special note shall be inscribed duly mentioning that  the groove sizes are indicative and a separtate hydro mechanical drawing shall be referred for the details of EM parts and secondary concrete

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