Restoration of subsidence from Km 175.350 to Km 175.580 (Old KMC dumping site) on NH-29 under PWD (NH) Division-I, Kohima in the state of Nagaland under Special Repair during 2025-26

EARTH CUTTING ON HILL SIDE

Excavation in Soil using Hydraulic Excavator CK 90 and Tippers with disposal upto 1000 metres. (Excavation for roadwork in soil with hydraulic excavator of0.9 cum bucket capacity including cutting and loading in tippers, trimming bottom and side slopes, in accordance with requirements of lines, grades and cross sections, and transporting to the embankment location within all lifts and lead upto 1000m)

PAVEMENT RESTORATION

By Mix in Place Method (Construction of granular sub-base by providing close graded material, spreading in uniform layers with motor grader on prepared surface, mixing by mix in place method with rotavator at OMC, and compacting with vibratory roller to achieve the desired density, complete as per clause 401)

Grading-I material

Grading-II material

Wet Mix Macadam (Providing, laying, spreading and compacting stone aggregates to wet mix macadam specification including premixing the material with water at OMC in mechanical mix plant carriage of mixed material by tipper to site, laying in uniform layers with paver in sub base/ base course on well prepared surface and compacting with vibratory roller to achieve the desired density.

Laying using grader

UNLINED DRAIN

Surface Drains in Soil (Construction of unlined surface drains of average cross sectional area 0.40 sqm in soil to specified lines,grades,levels and dimensions to the requirement of clause 301 and 309.Excavated material to be used in embankment within a lead of 1000 metres.

Mechanical means

CONSTRUCTION OF HP CULVERT (1200 mm dia)

Excavation for Structures (Earth work in excavation of foundation of structures as per drawing and technical specification, including setting out, construction of shoring and bracing, removal of stumps and other deleterious matter, dressing of sides)

Down stream head wal, Up stream head wall and Hume Pipe (Between the head walls)l

Dry rubble flooring

Down stream head wal, Up stream head wall and Hume Pipe (Between the head walls)l

Plain/Reinforced cement concrete in open foundation complete as per drawing and technical specification- PCC M15 Grade

Down stream head wal, Up stream head wall and Hume Pipe (Between the head walls)l

Supplying, fitting and placing HYSD bar reinforcement in sub-structure complete as per drawing and technical specifications (Provided at PCC bed)

(for 12mm dia & 10 mm) Down stream head wal, Up stream head wall and Hume Pipe (Between the head walls)l

Stone masonry work in cement mortar 1:3 for substructure complete as per drawing and Technical Specifications

Coursed rubble masonry (first sort ) after Deduction for space occupied by hume pipe

Down stream head wal; and Up stream head wall

BEDDING FOR PIPE

Plain/Reinforced cement concrete in open foundation complete as per drawing and technical specification

Area after Deduction for space occupied by hume pipe

Supplying, fitting and placing HYSD bar reinforcement in sub-structure complete as per drawing and technical specifications (Provided at PCC bed)

12 mm dia for hume pipe bedding

Stone masonry work in cement mortar 1:3 for substructure complete as per drawing and Technical Specifications

Coursed rubble masonry (1st sort) in Parapet

Laying Reinforced Cement Concrete Pipe NP4/prestrssed concrete pipe on first class bedding in single row . (Laying Reinforced cement concrete pipe NP4/prestrssed concrete pipe for culverts on first class bedding of granular material in single row)

Back filling behind abutment, wing wall and return wall complete as per drawing and Technical specification

Granular material after Deduction for space occupied by hume pipe

CATCH PIT

Excavation for Structures (Earth work in excavation of foundation of structures as per drawing and technical specification, including setting out, construction of shoring and bracing, removal of stumps and other deleterious matter, dressing of sides) I. Manual Means - Soil (Upto 3 m depth)

Plain/Reinforced cement concrete in open foundation complete as per drawing and technical specification

Supplying, fitting and placing HYSD bar reinforcement in sub-structure complete as per drawing and technical specifications (Provided at PCC bed)

12mm dia for catch pit base

Stone masonry work in cement mortar 1:3 in foundation complete as drawing and Technical Specification

APRON

Plain/Reinforced cement concrete in open foundation complete as per drawing and technical specification

Stone masonry work in cement mortar 1:3 in foundation complete as drawing and Technical Specification

Random Rubble Masonry

Supplying, fitting and placing HYSD bar reinforcement in sub-structure complete as per drawing and technical specifications (Provided at PCC bed)

12mm dia provided in sub-structure

Plain/reinforced cement concrete in sub-structure complete as per drawing and technical specifications- PCC M20

GABIAN WALL

Excavation for Structures (Earth work in excavation of foundation of structures as per drawing and technical specification, including setting out, construction of shoring and bracing, removal of stumps and other deleterious matter, dressing of sides and bottom and backfilling with approved material.) upto 3 metre Maunal means/ upto 3 m depth

Gabian Structure for Retaining Earth (Providing and construction of a gabain structure for retaining earth with segments of wire crates of size 7 m x 3 m x 0.6 m each divided into 1.5 m compartments by cross netting, made from 4 mm galvanised steel wire @ 32 kg per 10 sqm having minimum tensile strength of 300 Mpa conforming to IS:280 and galvanizing coating conforming to IS:4826, woven into mesh with double twist, mesh size not exceeding 100 x 100 mm, filled with boulders with least dimension of 200 mm, all loose ends to be tied with 4 mm galvanised steel wire)

Back filling behind abutment, wing wall and return wall complete as per drawing and Technical specification Granular Material

CLEARANCE OF LANDSLIDE

Land Slide Clearance in soil (Clearance of land slides in soil and ordinary rock by a bull-dozer D 80 A-12, 180 HP and disposal of the same on the valley side)