namma metroConstruction challenges

A circular railway of 57.9 km metro system on two corridors

Phase-I 12.9 km - Rajajinagar to Jayanagar

Phase - II 11.2 km-Hudson Circle to Krishnaraja puram.

Phase III

Phase IV

*INTRODUCTION

CLIENT : BANGALORE METRO RAIL COROPORATION LIMITEDCONSULTANT: RITES

L&TS SCOPE : REACH -III - 3 STATIONS REACH- IV -3 STATIONS

*INTRODUCTION

*METRO ROUTE MAP

East West Corridor : 18.10 kmsNorth-South Corridor : 24.20kmsTotal : 42.30 kmsElevated : 32.85 kmsAt grade (at ground level) 00.65 kmsUnder ground 08.80 kmsGauge standard gaugeTraction 750 v Dc third railNo of stations 39(31 elevated,8 Ug) Travel time 33/44 mins (end to end)Head way 4 mins at start ; later 3 mins

CHALLENGES IN NAMMA METRO CONSTRUCTION:

Traffic volume & diversion Deep excavation (6 m from road level)Local Public issues / Project Affected PeopleExisting utilitiessafetyEnvironmental aspects Space constraints (Stacking ,Transporting &Erection Of Precast Girder) Media Focus (Increased spot lights ) Quality of skilled labour

Challenge: 1.Traffic Volume & Diversion

Safety of public & workmenProductivity Progress

Both the footpaths are demolished and Constructed for temporary road6M6M12MSTAGE 1

6M6MSTAGE 1EXISTING PATHWAY TO BE DEMOLISHEDERCT THE BARRICATIONMAKE THE TEMPORARY ROADPIER

L&T TRAFFIC MARSHALS ENGAGED WITH SIGNAL TORCH (FLUORESCENT LIGHT) AT NIGHT SHIFT BLINKER LIGHTS

Challenge 2 : Deep Excavation

Challenge: 3 Project affected people

a) Pre-construction stage Land acquisition/litigation

b) Construction stage, Noise pollution Air pollution Traffic diversion Utility diversion Working hours

Challenge: 4 Existing utilities

Identification of utilities

Interfacing with various agencies ( Govt / Non Govt) (BBMP,BWSSB,BESCOM,KPTCL,BSNL etc)

Challenge 5: safety

Safety

Pep talk conducted for Traffic Marshals and Workmen

Traffic signage and painted Hard barricading boards with Reflective ballet postsBallet post

Challenge 6: Environmental aspects

Some of the environmental components considered under this are

Trees Air pollution Noise levels Soil erosion and pollution Disposal of excavated soil and debris Maintaining of roads/Drainages

Challenge : space constraints

ImpactsCasting ,stacking& transportationErection scheme

Stacking ,Transportation & Erection Of Precast Girder

A major concern with girder erection is the security and stability of the superstructure

During all phases of erection with respect to construction conditions, wind loads and construction loads.

Stacking of the girders until the erection part comes & delivery of precast concrete girders to the site

Erection of precast girders with the traffic flow.

Erection Methodolgy for R4 06082009.pptTaking the above things in consideration L&T made a detailed erection scheme.

ResourceChallenge 9 : Quality of skilled labour

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