SLOPE STABILIZATION AND AVALANCHE PROTECTION AT KM 14.700 ON APPROACH ROAD TO SOUTH PORTAL (ARSP) UNDER PROJECT ROHTANG TUNNEL IN STATE OF HIMACHAL PRADESH

Amount

Excavation in soil in hilly area by mechanical means including cutting and trimming of side slopes and disposing of excavated earth with all lifts and lead upto 1000 metres.

a) Available from excavated material, screened, meeting the specifications.

b) Material to be procured -Borrow material meeting the speciifcations

Providing & Backfilling behind reinforced soil wall with available backfill material including all leads and lifts, including segregation, complete as per drawing and technical specification (Reference to MoRT&H's specification Clause 3100 and IRC:78 caluse 710.1.4) & 2200. (Backfill)

Supplying and installation of Gabion facia unit with integrated tail as secondary reinforcement of length 2m that is made of mechanically woven, double twisted, hexagonal shaped wire mesh, Mesh type 10x12 as per IS 16014:2018, having D=100mm with tolerance of +/-10%, wire dia ID/OD 2.7/3.7mm, (Zn +10%Al) + polymer coated, mechanically edged/selvedged and shall have minimum 10 numbers of mesh openings per meter of mesh perpendicular to twist, with partition at 1 m interval etc. complete as per detailed technical specifications attached and as directed by Engineer-in –Charge.

Size of Gabion Units 3m x 2m x 0.5 m (LxBxH).

Supply and installation of Green facia unit with Biodegradable erosion control banket and welded mesh panel and integrated tail as secondary reinforcement of length 2m that is made of mechanically woven, double twisted, hexagonal shaped wire mesh, Mesh type 10x12, having D=100mm with tolerance of +/-2%, wire dia ID/OD 2.7/3.7mm, Zn+10%Al+PVC coated, MORTH specification No 3100

Size 3mX2mX0.8 m

Size 3mX2mX0.63 m

High Strength Geogrid of tensile strength (MD) : 115 kN/m (long term)

High Strength Geogrid of tensile strength (MD) : 145 kN/m (long term)

High Strength Geogrid of tensile strength (MD) : 175 kN/m (long term)

Supply and installation of polyester needle punched non woven geotextile as filter media behind Gabion/Reinforced soil wall, behind gabion wall and wrapped around PVC pipe, as per MoRTH 700 Type-III geotextile. The width of geotextile roll shall not be less than 4.5 m, at easily accessible location including top and bottom, with all leads and lifts, manpower and machinery, materials, labour etc. complete and as directed by Engineer - In - Charge.

Supplying and laying drainage composite for use behind walls, between two different fills, alongside and below drains of road, below concrete lining of canals etc.having three dimensional composite with thermobonding a draining core having “W” configuration in extruded monofilaments of minimum thickness 7.2mm, with two filtering UV stabilized polypropylene nonwoven geotextile of minimum thickness of 0.75mm charactersitic opening size (O90) of 110 micron and tensile strength of 8.0 kN/m that will be working as separation or protecting layer, Geocomposite having in plane flow capacity of 2.1 L / (m.s) at hydraulic gradient of 1.0 & 20 kPa pressure and tensile strength of 18 kN/m, with mass per unit area of 740 gsm, having minimum creep reduction factor of 1.15 for 100 years life at 100 kPa, at easily accessible location including top and bottom, with all leads and lifts, manpower and machinery, materials, labour etc. complete as per detailed technical specifications and as directed by Engineer - In - Charge.

Supply and installation of Gabion units of 1 m height made of mechanically woven, double twisted, hexagonal shaped steel wire mesh as per IS 16014:2018, MORTH clause 2500 of required sizes, Mesh type 10x12 with mesh opening tolerances -10% to +10%, Mesh wire dia 2.7/3.7mm(ID/OD ), (Zn+10%Al + Polymer coated), mechanically edged/selvedged ,with partition at 1 m interval and shall have minimum 10 numbers of mesh openings per meter of mesh perpendicular to twist,tying with lacing wire of diameter 2.2/3.2 mm (ID/OD), placing at indicated places in dry condition at easily accessible location as per direction of Engineer including tools, plant, labour etc. complete in all respect, carrying the material from nearest approach with all leads & lifts, manpower & machinery, materials, labor etc. complete as per detailed technical specifications and as directed by Engineer-In-Charge.

Supply and installation of 0.5 m thick Gabion mattress made of mechanically woven, double twisted, hexagonal shaped steel wire mesh, Mesh type 10X12 as per IS 16014:2018, Mesh wire dia 2.7 / 3.7 mm (ID/OD ), (Zn+10%Al)+ Polymer coated,Mechanically edged/selvedged, with partition at 1 m interval , tying with lacing wire, placing at indicated places in dry condition at easily accessible location as per direction of Engineer including tools, plant, labour etc. complete in all respect, carrying the material from nearest approach with all leads & lifts, manpower & machinery, materials, labor etc. complete as per detailed technical specifications and as directed by Engineer-In-Charge.

Supply and Installation of Self Drilling Anchors of 32 mm diameter, yield load > 230 kN, drill hole of 110 mm, hexagonal nut, washer plate, coupler for connecting bars,drill bit (in case of self drilling anchors) and full length grouting with admixture including all ancillary items for foundation anchoring and as per technical specifications etc. complete as per detailed technical specifications and as directed by Engineer - In - Charge.

Supply and installation of double corrosion-protected multi strand prestressed cable anchors with initial prestress load > 1094 kN (with 6 no.s of 15.2 mm dia strands with breaking load per mono strand of 260.7 kN) and drill hole dia of 150 mm with full length grouting in two phases (grout length for prestress = 30%), protective sheath for exposed part above the anchor head, centrallizers, including all ancillary items for anchoring, grouting and stressing on the slope surface along with casing (if required) for drilling in collapsible strata as per detailed technical specifications and as directed by engineer in charge.

Providing and spreading High Resistance steel wire grid/mesh Geocomposite consisting of hexagonal double twisted wire mesh type 8x10 woven with steel wire with a diameter of 2.70 mm (EN 10223-3; EN 10218), Zn-5%Al coated (EN 10244 - class A), interlaced during manufacturing in longitudinal and transversal directions with steel cable , grade 1770 MPa, having a diameter of 8 mm (EN 12385-4) Zl-5%Al coated (EN 10244 - class A), at a spacing of less than 0.7 m, meeting the minimum requirements:

Longitudinal and Transversal Tensile Strength of High Resistance Steel Wire mesh /Grid Geocomposite : 85 kN/m

Puncture Resistance of High Resistance steel wire mesh/grid Geocomposite : 180 kN at maximum displacement of 50cm

including top and bottom support rope, lacing wire or rope required to connect the nets and all accessories such as U-clamps, thimbles, including safety, all other ancillary works, material, machinery, labour, etc., with all leads and lifts and as per detailed technical specifications and as directed by Engineer - In - Charge.

Supply and installation of three dimensional erosion control mat made of polypropylene polymer of minimum mass per unit area 450 gm / sqm extruded on to a mechanically woven double twisted hexagonal shaped steel wire mesh (as per EN 10223-3) made up of 2.7mm dia having a combined mass per unit area of the composite more than 2000 gm/sqm. Steel wire and mesh type 8 x 10 having Zn-Al 5% coating as per EN 10244-2 longitudinally weaved with steel cable of 8 mm diameter at a spacing of 2.0 m. Including all necessary accessories like U pins etc. required for erosion control mats in place as per detailed technical specifications and as directed by engineer in charge.

Providing and application of hydraulically applied erosion control products by means of hydroseeding/ hydromulching on the hill side and valley side slope surface for erosion control by means of vegetation including safety, all other ancillary works, material, machinery, labour, etc., with all leads and lifts and as per detailed technical specifications and as directed by Engineer - In - Charge.

Construction of RCC nail head for pre-stressed anchors

Construction of RCC pedestal and RCC jacketing

Providing and installing subsurface drainage pipes (horizontal / inclined) in the slope (long drains suitable for collapsible strata) drilling and inserting the perforated PVC pipe as per the drawings etc. complete and as directed by Engineer -In -Charge.

Providing and placing drainage pipes behind the reinfiorced soil structure with perforated PVC pipe (lined with Non -woven Geotextile) of 160 mm internal diameter by placing the perforated PVC pipe as per the drawings etc. complete and as directed by Engineer -In -Charge.

Providing big size boulders of size more than 0.75m diameter designed as per IRC-89 to be placed in front of river side toe gabion wall and on top of mattress (scour apron) as a protective layer from the impact of river flow and debris.

Constrcution of PCC base for providing support below the reinforced soil structure

Construction of drains (berm drains, catch drains etc.) 1 m deep and 1 m wide including excavation for drains and 0.2 m thick PCC/RCC lining of M15 grade concrete.

Providing and Installation of Flexible Snow avalanche mitigation units made of cruciform shaped frame structure of height 4.25m (minimum)X3.40m (minimum) of metallic beams in steel grade E275 or above connected to steel tubular tieby flexible universal ball joint having breaking load greater than 300kN (along with 4/8 no.s of steel cable ties to transfer the load from front facia to the tie) and having front facing steel wire rope panel made of 8mm diameter of mesh size 300mmx300mm with steel wire double knot connectuon at joint and mechanically woven double twisted hexagonal shaped Zn coated wire mesh panel attached to the crooss-shaped frame and as per technical specifications and as direted by Engineer-In-Charge.

Supply and Installation of Self Drilling Anchors of 32 mm diameter, yield load > 280 kN, nut, washer plate, coupler for connecting bars,drill bit and full length grouting with admixture including all ancillary items for foundation anchoring etc. complete as per technical specifications and as directed by Engineer - In - Charge.

R.G BUILDWELL ENGINEERS LTD.

Bharat Constructions (India) Pvt. Ltd.