design proforma amd

7/29/2019 Design Proforma Amd

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Design Data Pertaining to the work of :

Construction of HLB across Masi Vagu on Narayanapuram to Mittapalliroad at KM 10/800 in Yellandu Mandal of Khammam District.

Under Tribal welfare Department

Reference to Administrative Sanction : - G.O Ms No. ..

For Rs. 00 Lakhs.


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1. Hydraulic Data :-

1. Type of crossing = Normal

2 Design Discharge = 1120.37 cum / sec

3. MFL = +100.000 M

4. Sill Level = + 93.500

5. Velocity of flow = 1.408 m/sec

6 Afflux = 0.15

7. Vertical clearance = 1.20 M

8. Silt Factor, Ksf = 2.00

9. Normal Scour depth, dsm = 7.5 m (MFL-Soft rock level)

10. Foundation Levels = Soft rock level -1.5m

For piers = + 91.000 mFor abutments = + 91.000 m

10. L.W.W and Vents Provided :-

1. L.W.W required = 80 M

2. Vent Way Provided = 5 Vents of 16.5 m (eff) without footpaths

3. Length of bridge (Back to Back of abutments) = 86.23 m(5*17.07+6*.03+2*.35= 86.23 m)

11. Foundation Strata, SBC and Type of foundations adopted:-

Soft Rock/SDR is available at a shallow depth of 1.0 m below sill level as per

excavation carried at site for piers and abutments. The SBC considered is

25.0 t/m2. Open Foundations are adopted.


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Piers

Open foundations in VCC M 15 are provided duly fixing the foundation level

with 1.5 m embedment in SDR/Soft Rock

Abutments:

Open foundations in VCC M 15 are provided duly fixing the foundation level

with 1.5 m embedment in SDR/Soft Rock

Wing Walls: Box wings in VCC M 15 are proposed.

12. Foundation Levels and strata of resting:-

All the Piers = (+) 91.000 (resting in SDR/SR)

Abutments A1, A2 = (+) 91.000 (resting in SDR/SR)

13. Substructure:-

Abutments: Wall type abutments in VCC M 15 mix with skin reinforcement.

Piers: Wall type piers in VCC M 15 mix with skin reinforcement.

Wingwalls: Box wings in VCC M 15 mix with skin reinforcement.

14. R.C.L Calculations:-

MFL = + 100.0

V.C = 1.2

Afflux = 0.15Deck Th. = 1.675

Wearing coat = 0.100

+103.125 M

Bearings:- Neoprene Rubber bearings of size 630X220X061 mm.


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15. Type of Superstructure and Drawings adopted) :

RCC T beam girder and RCC slabs of 16.5 m (eff) span , without footpaths areprovided as per MOST BD drawing Nos. BD / 13-76,14-76A,15-76A.

16. Expansion Joints :- Single Strip Seal Expansion Joints of standardmake

17. Wearing Coat :- As per BD drawing No. BD / 1- 69 A in VRCC M

30.

Thickness = 100mm at center and 50mm at edges

18. Approach Slabs :- As per CE drawing No. 4- 71 in VRCC M30

Length = 4.0m, Width = 7.5m, Thickness =0.30m

12. Hand Rails: As per drawing no. BD / 5-69 , type II in RCC M20

13. Data adopted from Standard Superstructure drawings for Design Purpose

Drawing Nos. referred (without footpaths)

1. BD/13-76

2. BD/14-76A

3. BD/15-76A

Dead Load :

@ Pier = 174 T @ Abutment = 87 T

Live Load :

LL = (DL+LL) - DL

@ Pier = 82.25 T @ Abutment = 70.0 T

Concrete Quantity / Span: 61.2 cum

Steel Quantity / Span :

(ii)Reinforcing steel: 10.373 T(Including 5 % extra for wastage and laps)


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Design Procedure adopted

1. Substructure including foundations :

Abutments and their foundations: Abutment: Wall type in VCC M 15 concrete

with open foundations is designed as per IRCcodes for 2 lanes.

Piers and their foundations: pier: Wall type in VCC M15 with open foundationsis designed as per IRC codes for 2 lanes.

Wing walls and their foundation: Box wing wall in VCC M15 with open

foundations as per IRC codes.

Bed blocks over abutments and piers: Computer MS EXCEL program is used for

design of Bed block over abutment.

Backing walls: Computer MS EXCEL program is used for design of backing wallover abutment.

Live Load eccentricity calculations

(As per BD drawings of MORTH)

Transverse:-

(7.5/2) - ( 1.2 + (2.79/2) )

= 1.155m

Longitudinal: .285+.015

= .3 m

design proforma amd

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