GEOSYNTHETICS

CHAPTER 16
GEOSYNTHETICS AND REINFORCED EARTH
S. No		Description	Unit	Quantity
1		2	3	4
1		Sub-Surface Drain with Geotextiles
		Construction of sub surface drain 200 mm dia using geotextiles treated with carbon black with physical properties as given in clause 702.2.3 formed in to a stable network and a planar geocomposite structure, joints wrapped with geotextile to prevent ingress of soil, all as per clause 702 MORTH and approved drawings including excavation and backfilling
		Unit = Running metre
		Taking output = one metre
		a) Labour
		Mate	day	-
		Mazdoor skilled	day	0.250
		Mazdoor (Unskilled)	day	0.540
		b) Material
		Geonets, geomembrane and geotextile to make planar geocomposite stable network for sub surface drain including wrapping of joints with 160 mm over lapping with geotextile .
		Geonets	sqm	1.000
		Geomembrane	sqm	1.000
		Geotextile	sqm	2.000
		Add 2 per cent cost of material for miscellaneous items like synthetic cord
		c&d) Overheads & Contractors Profit		18.00%
		Rate per metre = a+b+c+d
		Note : Surplus excavated material to be used at site. Hence separate cost for disposal not added.
2		Narrow Filter Sub-Surface Drain as per Specification 702.4
		Construction of a narrow filter sub- surface drain consisting of porous or perforated pipe laid in narrow trench surrounded by a geotextile filter fabric, with a minimum of 450 mm overlap of fabric and installed as per clause 702.3 and 309.3.5 including excavation and backfilling
		Unit = Running metre length
		Taking output = one metre
		a) Labour
		Mate	day	-
		Mazdoor skilled	day	0.250
		Mazdoor (Unskilled)	day	0.540
		b) Material
		Perforated geosynthetic pipe 150 mm dia	M	1.000
		Geotextile filter fabric	sqm	1.250
		Add 2 per cent cost of material for miscellaneous item like synthetic cord
		c&d) Overheads & Contractors Profit		18.00%
		Rate per metre = a+b+c+d
		Note : Surplus excavated material to be used at site. Hence separate cost for disposal not added.
3		Laying Paving Fabric Beneath a Pavement Overlay as per Specification 703
		Providing and laying paving fabric with physical requirements as per table 704-2 over a tack coat of paving grade Bitumen 80-100 penetration, laid at the rate of 1 kg per sqm over thoroughly cleaned and repaired surface to provide a water resistant membrane and crack retarding layer. Paving fabric to be free of wrinkling and folding and to be laid before cooling of tack coat, brooming and rolling of surface with pneumatic roller to maximize paving fabric contact with pavement surface
		Unit = sqm
		Taking output = 2800 sqm
		a) Labour
		Mate	day	-
		Mazdoor (Unskilled)	day	20.800
		b) Machinery
		Road sweeper 1250 sqm per hour	hour	2.240
		Pneumatic roller 14 tonnes 2000 sqm per hour	hour	1.400
		Bitumen pressure distributor 1750 sqm per hour	hour	1.680
		c) Material
		Paving Fabric	sqm	2940.000
		Paving Bitumen 80-100	tonne	2.800
		d&e) Overheads & Contractors Profit		18.00%
		Cost for 2800 sqm = a+b+c+d+e
		Rate per sqm =(a+b+c+d+e)/2800
4		Laying Boulder Apron in Crates of Synthetic Geogrids as per Specification 704
		Providing, preparing and laying of geogrid crated apron 1 m x 5 m, 600 mm thick including excavation and backfilling with baffles at 1 metre interval, made with geogrids having characteristics as per clause 704.2 MORTH, joining sides with connectors/ring staples, top corners to be tie tensioned, placing of suitable cross interval ties in layers of 300 mm connecting opposite side with lateral braces and tied with polymer braids to avoid bulging, constructed as per clause 704.3. filled with stone with minimum size of 200 mm and specific gravity not less than 2.65, packed with stone spalls, keyed to the foundation recess in case of sloping ground and laid over a layer of geotextile to prevent migration of fines, all as per clause 704 and laid as per clause 2503.3 and approved design.
		Unit = cum
		Taking output = 3.00 cum
		a) Labour

		Mate	day	-
		Mazdoor skilled	day	0.500
		Mazdoor (Unskilled)	day	1.560
		b) Material
		Geo grids	sqm	21.000
		Connectors/ Staples	each	50.000
		Polymer braids	M	20.000
		Stones with minimum size of 200 mm	cum	3.450
		Stones spall for filling voids	cum	0.450
		c&d) Overheads & Contractors Profit		18.00%
		Cost for 3 cum = a+b+c+d
		Rate per cum = (a+b+c+d)/ 3
5		Reinforced Earth Structures as per Specification 3100 MORTH
		Reinforced earth Structures have four main components as under:
		a) Excavation for foundation, foundation concrete and cement concrete grooved seating in the foundation for facing elements (facia material).
		b) Facia material and its placement.
		c) Assembling, joining with facing elements and laying of the reinforcing elements.
		d) Earth fill with granular material which is to be retained by the wall.
		Each component is analysed separately as under:
		considering Average height of wall = 8 m.
6	(i)	Assembling, joining and laying of reinforcing elements as per Specification 3102 MORTH
	A	With reinforcing element of steel / Aluminum strips / polymeric strips.
		Unit = Running Metre
		Taking Output = 450 m
		a) Labour
		Mate	day	-
		Mazdoor (Unskilled)	day	6.360
		Mazdoor skilled	day	3.000
		b) Material
		@ Reinforcement strips 60 mm wide 5 mm thick as per clause 3102.
		1.Galvanised carbon steel strips	M	450
		or
		2.Copper Strips	M	450
		or
		3.Aluminium Strips	M	450
		or
		4.Stainless steel strips	M	450
		or
		5.Glass reinforced polymer/fiber reinforced polymer/polymeric strips	M	450
		@ Any one of the above alternative may be adopted as per approved design.
		Add 10 per cent of the cost of reinforcing strip towards accessories like tie-strips, nuts and bolts and loops/lugs for joining reinforcing elements with the facia panels, overlaps, heat bonding or extension.
	I	Galvanised carbon steel strips
		c&d) Overheads & Contractors Profit		18.00%
		Cost of 450 m = a+b+c+d
		Rate per metre =(a+b+c+d)/450
	II	Copper Strips
		c&d) Overheads & Contractors Profit		18.00%
		Cost of 450 m = a+b+c+d
		Rate per metre =(a+b+c+d)/450
	III	Aluminum Strips
		c&d) Overheads & Contractors Profit		18.00%
		Cost of 450 m = a+b+c+d
		Rate per metre =(a+b+c+d)/450
	IV	Stainless steel strips
		c&d) Overheads & Contractors Profit		18.00%
		Cost of 450 m = a+b+c+d
		Rate per metre =(a+b+c+d)/450
	V	Glass reinforced polymer/fiber reinforced polymer/polymeric strips
		c&d) Overheads & Contractors Profit		18.00%
		Cost of 450 m = a+b+c+d
		Rate per metre =(a+b+c+d)/450
	B	With reinforcing elements of synthetic geogrids
		Unit = sqm
		Taking output = 300 sqm
		a) Labour
		Mate	day	-
		Mazdoor (Unskilled)	day	6.360
		Mazdoor skilled	day	3.000
		b) Material
		Synthetic Geogrids as per clause 3102.8 and approved design and specifications.	sqm	300.000
		Add 10 per cent of the cost of reinforcing elements (synthetic geogrids) for accessories like tie-strips, nuts and bolts and loops/lugs for joining reinforcing elements with the facia panels, overlaps and other protective elements for synthetic geogrids.
		c&d) Overheads & Contractors Profit		18.00%
		Cost of 300 sqm of Synthetic geogrids = a+b+c+d
		Rate per sqm = (a+b+c+d)/ 300
	(ii)	Facing elements of RCC as per Specification 3104 MORTH
		Unit = sqm
		Taking output = 75 sqm
		a) Labour
		Mate	day	-
		Mazdoor (Unskilled)	day	3.180
		Mazdoor skilled	day	1.500
		b) Machinery
		Light crane with lifting capacity upto 3 tonne	hour	6.000
		c) Material
		Pre-cast RCC M-35 facing elements of size as per design and 18 cm thick for 75 sqm. (Refer Chapter 12)	cu.m	13.500
		HYSD steel @ 5 kg / sqm (Refer Chapter 12)	t	0.380
		Add 2 per cent of cost of facia panels, for all necessary temporary form work, scaffolding and provision of loops/lugs for lifting of panels and joining the reinforcing elements.
		d&e) Overheads & Contractors Profit		18.00%
		Cost for 75 sqm = a+b+c+d+e
		Rate per sqm = (a+b+c+d+e)/ 75
		Note : 1.The specification and construction details to be adopted shall be as per section 3100 of MoRTH Specification.
		2. Drainage arrangement shall be made as per approved design and drawings.
		3. The quantity of filler media shall be calculated as per approved design and specifications and shall be priced separately. The rate for same to be adopted from chapter 15.
		4. Excavation for foundation including foundation concrete and groove in the foundation for seating of bottom most facia panel and capping beam to be calculated as per design and priced separately. The rates for excavation and foundation concrete shall be taken from the chapter 12 & 13 in bridge section.
		5. The earth fill to be retained is not included in this analysis. The same is to be worked out and provided separately complete as per clause 305.
		6. For compaction of Earthwork, attention is invited to clause 3105.5 of MoRTH Specification.
		7. Length of reinforcing strips will vary with the height of wall and will be as per approved design and drawings.
		8. The type of reinforcing elements to be adopted shall be as per approved design and specifications.
		9. The market rate for supply of reinforcing elements and their accessories are to be ascertained from reputed firms in the field of earth reinforcement.
		10. The earth fill material shall be clean, free draining, granular with high friction and low cohesion, non-corrosive, coarse grained with not 10 per cent of particles passing 75 micron sieve, free of any deleterious matter, chlorides, salts, acids, alkalies, mineral oil, fungus and microbes and shall be of specified PH value.
		11. Capping beam is to be priced separately as per approved design. The rate for cement concrete shall be taken from the chapter of sub-structure in bridge section.
		12. The cost of reinforced earth retaining wall shall include following:
		(I) Excavation for foundation including backfilling.
		(ii) Foundation concrete as per approved design.
		(iii) Cost of facial panels and their erection .
		(iv) Cost of reinforcing elements including their fixing and joining with the facial panels.
		(v) Drainage arrangement including filter media as per approved design and drawings.
		13. The compacted earth filling to be retained shall form part of embankment.
		General Note :
		The provisions towards Mate is included in the provision towards unskilled Mazdoor.

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