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Flyovers at Santacruz airport Junction on Western Express Highway

Background

Mumbai Metropolitan Region Development Authority is contemplating to develop a master plan for integrated road development with the objective of strengthening and augmenting the existing road network particularly within the suburbs where intensity and demand for road traffic has been increasing significantly. As part of Master Plan it is intended to evolve efficient traffic dispersal system which will include provision of Elevated roads, Grade separators, Interchanges, ROB’s RUBs, subways, pedestrian vehicular underpasses, etc. Maharashtra State Road Development Corporation (MSRDC Ltd.) on behalf of Mumbai Metropolitan Region Development Authority (MMRDA) has decided to take up the Construction of Five Flyovers on WEH, in Mumbai to make WESTERN EXPRESS HIGHWAY a freeway. The flyover at Santacruz Airport near centaur hotel junction on western express highway is one such flyover identified by MMRDA.

Salient Fetures

Name of the Project	Construction of 6-Lane Flyover at SantacruzAirport Junction on Western Express Highway
Type of Project	Infrastructure Development Project
Type of Contract	Item rate contract
Original Contract Value	Rs. 30.78 Crores
Revised Contract Value	Rs. 36.89 Crores
Date of Agreement (LOA)	18^th September, 2006
Date of Work Order	9^th November , 2006
Time Frame	18 Months
Original Completion Date	08^th May, 2008
Revised Time Frame	28 Months
Revised Completion Date	31^st Mar, 2009
Type of Super structure design	Pre cast segmented ‘I’ Girder
Special Technologies	Cast in Situ Bored Pilling with Hydraulic Rig Precast- Post tensioned segmented I Girders Cast in situ Post tensioned End Diaphragms Approaches with Reinforced Earth
Original Overall Length of Flyover	714.765 Meter
Span Arrangements	(35x3) + (35+45+27.5) + (27.5+45+35) + (35x4) = Total 13 spans
Obligatory spans	2 Obligatory spans of 45 m
Viaduct Portion	460.00 m
Geotechnical Investigation	In general weathered rock strata frpm 3 to 5 mt below GL. Hard rock of 300T/Sqmt safe bearing capacity was available from 6mt to 9mt depth. Maximum depth of borehole is 16.00 m Ground water is encountered at depths between 3.0 to 5.0 m from ground level.
Foundation	Combination of pile and open foundations. Pile Foundation – 21 Nos. ( 161 Nos, of 1200mm dia bored cast in situ pile. Permanent liner of 6mm thickness up to rock level. Piles were anchored in rock. Open foundation: - 7 nos.
Sub Structure	Solid R.C.C. rectangular Pier.-28 Nos RCC rectangular shape Pier cap
Super Structure	Pre cast Post tensioned segmental ‘I’ girders. 6 Girders/18 Segments per Span. Cast in situ post tensioned end diaphragms
P.S.C. I girders	Total Girders : - 156 nos. Total Segments: - 468 nos. Total Stitches : - 352 nos. Total End Diaphragm :- 34 nos.
Bearings And Expansion Joint	POT-PTFE Bearing up to 850 MT capacity. Modular single beam/strip seal Expansion Joint.
Wearing Coat	6 mm Mastic Asphalt as water Proofing course over deck slab + 50 mm DBM + 25mm Mastic Asphalt as Top Wearing surface.
Approaches	Solid ramps with R.E.S.(Reinforced Earth structure) Approach lengths at Dahisar end is 106.95 m and at Bandra side 147.50 m
Crust On Approaches	GSB- 300 mm WMM- 225 mm BM-100 mm DBM-75 mm Mastic Asphalt-25 mm
Architectural Treatment	Architectural treatment is provided to Pier cap, anti crash barrier. To achieve this treatment rubber liners (Recli) were fixed in shuttering
Water Spouts	The water spouts are provided with runners and down pipe at pier location as shown and taken up to 0.5 m below ground level in to a collection chambers. All the chambers are connected to each other by NP3 class 300 diameter pipes and taken up to nearby drain.
Traffic	Out of 12 lanes available, only 6 lanes made available for construction activities.

Flyovers at Santacruz airport Junction on Western Express Highway

Background

Salient Fetures

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