Package-I Civil and Hydro-Mechanical Works of Diversion Tunnels pertaining to Tato-II Hydro Electric Project (700 MW), Arunachal Pradesh

Amount

CONTROL OF WATER, CONSTRUCTION DRAINAGE AND DEWATERING

Control of water, dewatering of surface/underground construction sites including all construction works, labor, plants and materials necessary to keep the construction sites free of water during the contract period. Complete in all respect as per technical specification, drawings and as directed by Engineer-in-Charge.

Dewatering of surface construction sites including all plants, materials, labour, installation, operation, power supply, maintenance and removal of pumping equipment from site

Dewatering of underground construction sites including all plants, materials, labour, installation, operation, power supply, maintenance and removal of pumping equipment from site

Construction of Temporray Ring Bund Complete in all respect with all plant, materials, labour, all lead & lifts, etc. as per technical specifications, drawings and as directed by Engineer-in-Charge

Clay/Earth/Random Fill

SURFACE EXCAVATION AND BACKFILL

Surface excavation including loading, transport, all lift and lead up to 3.0 km from the excavation area/working site, unloading at disposal sites or stockpiles and maintenance of the disposal sites or stockpiles. Construction of haul roads (if any) and its maintenance. Complete in all respect as per technical specification, drawings and as directed by Engineer- in-Charge.

Diversion Tunnel

Clearing of excavation areas, disposal areas and stockpiles

Excavation in soil including stripping of top soil

Excavation in soft and disintegrated rock

Excavation in hard rock

(a) Drilling and blasting

(b) Line-drilling

Cost of Haulage including loading & unloading of excavated materials For all types of Tracks beyond initial lead of 3.00km (Lead = 2 km)

Backfilling

(a) Random backfill

(c) Free-draining backfill

(d) Sand-gravel backfill

Providing and laying Pitching complete as per drawings and technical specifications at locations as directed by the Engineer-in-Charge Stone/ Boulders

Providing and laying boulders apron on river bed for protection against scour with stone boulders weighing not less than 40 kg each complete as per drawings and technical specification. Boulders laid without wire crates

UNDERGROUND EXCAVATION

Underground excavation of Diversion Tunnel including excavation by drill and blast, mechanical, manual or conventional methods; including all survey and setting-out, all lifts, transportation and unloading at disposal sites upto 3.0 km from the nearest portal and including maintenance of the disposal sites or stockpiles. Construction of haul roads (if any) and its maintenance. Complete in all respect as per technical specification, drawings and as directed by Engineer-in-Charge.

Diversion Tunnel including handling of excavated materials upto 3.0 km from the nearest portal

(a) Excavation in class 2

(b) Excavation in class 3

(c) Excavation in class 4

(d) Excavation in class 5

Loading, transport including all lift and lead upto 3.0 km and unloading of accepted geological overbreak of Diversion Tunnel at disposal areas or stockpiles

Cost of Haulage including loading & unloading of excavated materials Katcha Track beyond initial lead of 3.00km (Lead = 2 km)

ROCK SUPPORT

Rock support for underground excavation of Diversion Tunnel including all plants, materials and labour. Complete in all respect as per technical specification, drawings and as directed by Engineer-in-Charge.

Shotcrete M25 including admixtures in underground works with articulated wet type shotcrete machine to the theoretical thickness as shown on the drawings or as directed by the Engineer-in-charge

(a) Without Steel Fibre Reinforcement

(b) With Steel Fibre Reinforcement

Supply and fixing in position Precast R.C.C. laggings

Supply and installation of resin/cement grouted rock bolts of any size and length in underground excavations, as shown on the drawings or as directed by the Engineer-in- charge, including all plants, materials and labour required for drilling, cleaning, installing, grouting and testing of the bolts. Complete in all respect

(a) 25mm dia

(b) 32mm dia

Supply and installation of Swellex Type rock bolts of any size and length in underground excavations, as shown on the drawings or as directed by the Engineer-in-charge, including all plants, materials and labour required for drilling, cleaning, installing, grouting and testing of the bolts. Complete in all respect 25 mm dia

Fabrication and erection of Steel ribs as permanent support as per the drawings or as directed by the Engineer-in-charge including all plants, materials, labour and accessories. Complete in all respect

Supply and providing of Forepoling with grouted anchor bars, length, dia, spacing and overlap to be determined on site by the Engineer-in-charge including all plants, materials and labour. Complete in all respect

Providing & fixing high tensile seamless pipe casing (minimum 21m long) of dia. 76-139mm & thickness 6-10mm, driven into medium using symmetrix drilling system (or equivalent) using sacrificial drill bits with all materials, accessories, equipments-machineries and labour ect. as per technical specification, drawings and as directed by Engineer-in-Charge complete in all respect.

Providing steel canopy support in underground excavation (HRT) including supplying , fabrication and installation at site with all materials, accessories, equipments-machineries and labour ect. as per technical specification, drawings and as directed by Engineer-in- Charge complete in all respect.

Welded Wire Mesh

SLOPE PROTECTION

Slope protection in surface excavation including all plants, materials and labour. Complete in all respect as per technical specification, drawings and as directed by Engineer-in-Charge

Rip-Rap

Bedding

Rip-Rap

Rock Paving

Dry rock paving

Rock paving in mortar

Gabions

Masonary walls

Supply and installation of resin/cement grouted rock bolts of ø 25 mm, length = variable in surface excavations, as shown on the drawings or as directed by the Engineer-in-charge, including all plants, materials and labour required for drilling, cleaning, installing, grouting and testing of the bolts. Complete in all respect

Shotcrete M25 including admixtures in open excavation with dry type/articulated wet type shotcrete machine to the theoretical thickness as shown on the drawings or as directed by the Engineer-in-charge

Without Steel Fibre Reinforcement

With Steel Fibre Reinforcement

Wire mesh

Chain link fabric/Welded wire mesh

(a) Welded Wire Mesh

Supply and Installation of Grouted Anchor Bars of any size and length alongwith all plants, materials and labour required or drilling, cleaning, installing and grouting. Complete in all respect

25 mm dia

32mm dia

CONCRETE

Complete in all respect with all plants, materials, formwork, scaffoldings, staging, labour, all lead and lift etc. as per technical specification, drawings and as directed by Engineer-in- Charge.

Plain/reinforced cement concrete in Inlet & Outlet Structures, etc.

Concrete block for launching apron (M 15-40)

Second stage concrete in blockout including formwork

M-15 in backfill, foundation & earth retaining structures

Plain/reinforced cement concrete in Diverson Tunnel

Cement concrete of M25 grade in Diversion Tunnel lining including formwork in overt

Cement concrete of M35 grade in Diversion Tunnel lining including formwork in invert

Backfilling upto pay line with M20 concrete

Backfilling of accepted geological overbreak (upto 7% of pay line) with M20 concrete for Diversion Tunnel

STEEL FOR REINFORCEMENT

Complete in all respect with all plants, materials, labour, all lead and lift etc. as per technical specification, drawings and as directed by Engineer-in-Charge.

Mild Steel Reinforcement

High yield strength deformed reinforcement

Diversion Tunnel

Inlet & Outlet Structures

DRILLING

Complete in all respect with all plants, materials and labour as per technical specification, drawings and as directed by Engineer-in-Charge.

Percussion drilling

Diversion Tunnel

(a) Drill holes up to ø 48 mm, length 10 - 30 m

Rotary drilling

Diversion Tunnel

Drill holes up to ø 76/80 mm, length < 30 m

Installation of pipes

Supply and installation of PVC pipes of 76mm dia (plain or slotted) including fittings and accessories

Drilling for Pre- Grouting

Drill holes up to ø 45 mm upto 10mm long for Pre-Grouting with Cement

Drill Holes up to 57mm upto 30m long for Pre-Grouting with Colloidal Silica

GROUTING

Complete in all respect with all plants, materials and labour as per technical specification, drawings and as directed by Engineer-in-Charge.

Contact grouting, grouting pressure = 2 to 5 kg/cm2

Contact grouting behind tunnel liner (concrete or steel)

Consolidation and curtain grouting (grouting pressure = 2 to 20 kg/cm2)

Diversion Tunnel, Inlet, Outlet, Portal and in any other areas as directed by the Engineer-in Charge

(a) Single - stage grouting

(b) Multiple - stage grouting, descending

(c) Multiple - stage grouting, ascending

(d) Sand to be used in sand-cement grouting

(e) Pre-grouting with Cement

(f) Pre-grouting with Colloidal Silica

Water pressure testing

Simple water pressure tests

Comprehensive water pressure tests

INSTRUMENTATIONS AND MONITORING

Tape extensometer station

Optical convergence measurement station

MISCELLENEOUS STEEL SECTIONS

Supply, fittings & fixings of metal works in all structure. Complete in all respect with all plants, materials and labour as per technical specification, drawings and as directed by the Engineer-in-Charge

Supply & Installation of Steel Pipes

75 mm dia.

100 mm dia.

200 mm dia.

300 mm dia.

Miscelleneous Steel Sections

Ladders & Climbing Iren

Erection Hooks

Steel Anchoring

Supply & installation of Non Return Valve in Diversion Tunnel

HYDRO-MECHANICAL WORKS

Design, supply, manufacture, inspection, shop assembly, painting, transportation, site storage & site erection, testing & commissioning including all labor, tools, tackles, plant & material of 4100 mm x 10400 mm fixed wheel type Diversion Tunnel Gate complete with accessories like wheels, guide Rollers, seals, lifting lugs and embedded parts including sill beam, seal seats, guides, tracks, etc. in accordance with technical specifications, drawing and as per instruction of the Engineer-In-Charge.

Gate Leaf: 1. Cost of Design & Drawings 2. Material Cost 3. Fabrication Cost including painting 4. Transportation Cost including Insurance 5. Cost of erection including cost of labour tools, tackles, plant & machineries, etc.

Embedded Parts & Steel Lining upstream & downstream of gate groove including groove lining including all necessary embedment and stiffeners complete as per specifications and drawings to the satisfaction of Engineer-in-Charge: 1. Cost of Design & Drawings 2. Material Cost 3. Fabrication Cost including painting 4. Transportation Cost including Insurance 5. Cost of erection including cost of labour tools, tackles, plant & machineries, etc.

Design, manufacture, inspection, shop assembly, painting, transportation, site storage & site erection, testing & commissioning including all labor, tools, tackles, plant & material of electrically operated rope drum hoists suitable for operation of diversion tunnel gate of size 4100 mm x 10400 mm under conditions specified in technical specification complete with all accessories including local control panels, trestles and hoist bridge in accordance with the specifications and drawings to the satisfaction of Engineer-In-Charge.

Break-up: 1. Cost of Design & Drawings 2. Material Cost 3. Fabrication Cost including painting 4. Transportation Cost including Insurance 5. Cost of erection including cost of labour, tools, tackles, plant & machineries, etc.

Design, manufacturer & supply at site of the spare parts as per list given in the technical specification

Vensar Constructions Company Limited (BID ID -869959)

Patel Engineering Limited (BID ID -868625)

IRCON INTERNATIONAL LIMITED (BID ID -870230)

Angelique International Limited (BID ID -868199)

Vensar Constructions Company Limited (BID ID -869959)

Patel Engineering Limited (BID ID -868625)

IRCON INTERNATIONAL LIMITED (BID ID -870230)

Angelique International Limited (BID ID -868199)