17. preambles

Wanek Factory 1

PREAMBLES TO WORK SECTIONS

1. GENERALLY

These preambles set out the amplification to methods of measurement, together with

factors to be taken into account when pricing. They apply to the whole of the works

regardless of the headings under which they have been described.

The descriptions stated in the Bills are not comprehensive. Reference should be made to

the ‘Specification of Materials and Workmanship’ for details of types of materials and

quality of workmanship; to Bill 1: General Conditions and Preliminaries for conditions

affecting the whole of the Works; and to these preambles for methods of measurement

and pricing factors.

The Contractor’ rates and prices shall be deemed to have allowed for compliance with

the above mentioned documents.

2. ITEM DESCRIPTIONS

Unless otherwise specifically stated in the Bills, the following shall be deemed to be

included with all items:

(1) Labour and all costs in connection therewith.

(2) Materials and goods including materials required for lapping, jointing and the like

and all costs in connection therewith such as conveyance and delivery.

(3) Unloading, storing, returning packings, handling, hoisting and lowering materials.

(4) Assembling, setting, fitting and fixing materials and goods in position.

(5) Waste of materials.

(6) All cutting.

(7) Use of plant and all costs in connection herewith.

(8) Establishment charges, overhead charges, financing charges and profit.

For the avoidance of doubt, overhead charges shall include head office and other

administrative overheads and any other costs and expenses of whatsoever nature and

howsoever arising.

Where items are described as ‘Supply only’, the rates and prices shall be deemed to

include (2), (5) and (8) above.

Where items are described as ‘Fix/Lay only’, the rates and prices shall be deemed to

include (1) to (8) above except (2) and (5).

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3. PILING

(1) Upper Cut-Off Lengths

Unless otherwise provided in the Bills, the upper cut-off lengths of piles will

become the property of the Contractor who is to remove them from the Site.

(2) Obstructions

The contractor is advised to probe for the presence of obstructions at the position

of his piles and have them removed in advance of his piling operations

No extension of time will be allowed for obstructions encountered during

operations.

(3) Rates to Include

The rates are to include for:

(a) Movement of piling frames into position and about the Site, any necessary

excavation or filling required to place the frames, raising or lowering the

frames and any staging, barges or the like required to support the frames.

(b) Driving/boring through and/or breaking up sandstone, shale, rock or

boulders at any depth.

(c) Removal of underground obstructions together with all Work in

connection therewith.

(d) Keeping bore holes and excavation work associated with the piling free

from water.

(e) Removing all surplus spoil due to piling works from site.

(f) Extending steel piles, damaged piles and piles which fail under tests.

(g) All necessary excavation and disposal and/or back-filling for cutting off

heads of piles.

(h) Redriving or intermittent necessitated by lengthening or up heaving of

piles or by the removal of obstructions under piles or other cause

including moving and repositioning the piling frame.

(i) Replacing incorrectly driven piles, damaged piles and piles which fail

under tests.

(j) Marking each pile with its length in metres at 0.1 metre intervals or its

whole length.

(k) Temporary pile caps and provision of all anchors, platforms, loading

materials and the like for test loadings.

(l) Supplying, transporting, handling, pitching, driving and withdrawing or

leaving in steel casings for bored piles. Alternatively, the contractor may

use Bentonite or other methods and shall include for all costs involved.

(m) Placing concrete in bore holes by tremie pipe, if required.

(n) Over building of bored piles to ensure sound concrete at cut-off level and

backfilling with spoil above cut-off level.

(o) Welding on of additional lengths of reinforcing bars where the projection

of a driven concrete pile head above the dressed head level is less than the

required projection length of the reinforcing bars.

(p) Additional costs incurred in casting and driving exploratory piles, which

will be used as working piles, in order to establish the fabrication lengths

of remaining driven concrete piles.

(q) Strutting and bracing for driving, use of driving caps and any jointing and

connections required to extend steel piles.

(r) Initial trenching, strutting and waling for driving steel sheet piles and any

jointing required to extend sheet piles vertically.

(s) Supplying timber piles in various or random lengths

(t) Supplying and fitting gang nailed anti-splitting plates at both ends of each

timber pile length.

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(u) Safety equipment and measures such as oxygen tanks, breathing

apparatus, etc for workers operating below the surface.

(v) The cost of any additional work such as deepening or enlarging pile caps,

providing tie beams, etc due to eccentricity of piles and/or damaged or

displaced piles.

(w) Idling time for all equipment, plant and labour for whatever reason.

(x) Submitting a confirmatory survey report of all piles installed, in triplicate,

duly signed by the Contractor and Engineer.

4. EXCAVATION

(1) Commencing level of excavation

Unless otherwise described in the Bills, excavation shall be deemed to commence

at existing ground or reduced level.

(2) Excavating Rock

Excavating in natural rock (other than boulders not exceeding 1m3 in volume

each) as defined in the Specification is measured separately.

To qualify for rock excavation rates, the Engineer must certify that the material

encountered is to be classified as rock, in accordance with the definition in the

Specification, and measurements of the volumes excavated agreed between the

contractor and S.O.

(3) Special strutting and shoring

Contractor shall be solely responsible for maintaining the safety and stability of

the sides of excavations and to provide whatever temporary works as are

necessary.

(4) Excavation rates


(a) Excavating around piles and confined areas and getting out.

(b) Excavating by hand and/or mechanical means in any materials

encountered including below the water table and for grubbing up roots of

trees and breaking up disused sewers and manholes.

(c) Excavating around and removing boulders not exceeding 1m3 in volume

each.

(d) Trimming, leveling and compacting bottoms and keeping sides plumb

(e) Multiple handling of excavated material and all transport and handling

charges at loading and unloading ends.

(f) Planking and strutting including any left-in, special strutting and shoring

(unless specifically designed by the consulting Engineers) and/or any other

means of withholding the sides of the excavation and ensuring the safety

of adjoining structures.

(g) Additional excavation and back-filling for formwork, planking and

strutting or to batter the face of the excavation in lieu

(h) Clearing any falls of earth into excavations.

(i) Complying with the Engineer’s directions issued from time to time to

ensure the safety of excavations and adjoining structures.

(5) Contractor Designed Special Strutting and Shoring System rates


(a) Designing the temporary strutting and shoring system to uphold the sides

of the excavations

(b) Preparing and submitting drawings and calculations endorsed by the

Contractor’s Professional Engineer to the S.O. for information

(c) Installing, maintaining and adapting, dismantling, removing, extra

excavation and back-filling, any additional piling supports, inconveniences

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to other trades working around or in sequence with the system and for all

making good.

(6) Back-fill, Hardcore and the like rates


(a) Ramming and consolidating

(b) Loss of materials in compaction and due to the soft nature of the ground

(c) Temporary retaining boards.

5. CONCRETE WORK

(1) Methods of Measurement

Upstaged beams, isolated beams and the like have been classified as beams.

Arbitrary decisions have been made as to whether small items are to be precast or

cast insitu. The Contractor may adopt either method of casting but payment will be

in accordance with the method of measurement expressed in the Bills.

Where sliding formwork or other formwork systems are specifically required to be

used by the contractor, they are measured as such in the Bills. Where their use is

adopted by choice by the Contractor, measurement and payment will be based

upon traditional methods of construction.

(2) Concrete rates


(a) Tests on concrete.

(b) Hoisting or pumping and placing in position.

(c) Tamping and/or vibrating to give thorough compaction.

(d) Working between and around reinforcement.

(e) Laying on any type of sub-base and for preparing and leaving surfaces to

receive screeds, pavings or rendering.

(f) Laying in bays including all labours associated with projecting

reinforcement

(g) Curing of concrete.

(h) Continuous daily pours of very large quantities.

(i) Pour joints, forming or cutting rebates grooves, chases, mortises, holes,

openings not exceeding 0.10m2 and making good and any other sundry

items of a like nature.

(3) Reinforcement

All steel bar reinforcement is in lengths not exceeding 12 metres unless otherwise

stated .

No allowance has been made in the weights of steel reinforcement for rolling

margin or the weight of weld metal.

The rates for reinforcement are to include for:

(a) Allowances for rolling margin and the weight of welds.

(b) Cleaning, cutting, bending, fabricating, placing, tying and the provision of

all necessary distance blocks, tying wire, non-designed spacers or chairs,

temporary fixings and supports.

(c) Extra material at laps of fabric reinforcement and for welding and

notching around obstructions.

(4) Formwork


(a) All necessary boarding, supports, erecting, framing, cutting, perforation or

pipes, angles, cleaning, wetting and treatment with mould oil, mould

liquid or limewhite and the like.

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(b) All notching, allowance for overlaps and passing at angles, battens,

strutting, bolting, wedging, easing, striking and removal

(c) Filleting to form chamfered edges and formwork to splayed angles not

exceeding 50mm wide.

(d) In addition to the above, the rates for formwork to produce a fair faced

concrete finish are to include for stopping all holes, cracks and the like in

cement mortar and rubbing down with a carborundum stone immediately

upon removal of the formwork to remove fins, board marks and other

irregularities.

(e) Rates for permanent metal formwork and waffle form and similar systems

are to include for:

(j) All necessary temporary supports and braces, erecting, fixing,

welding, cutting perforations for pipes, side laps, jointing between

panels, applied treatments, cleaning down before placing concrete,

easing, striking and removal.

(ii) Special starter and closing panels at edges of formwork , closing

ends of panels and perforations for ductwork, access hatches and

the like.

(iii) All necessary additional supports and sealing against units, in the

case of formwork to in situ concrete margins to unit moulds not

requiring support decking.

(5) Prestressed Concrete

In addition to the factors at (2), (3) and (4) , the rates are to include for:

(a) Submitting method statements with calculations, preliminary drawings

and specifications, details of proposed additional reinforcement or

modifications to reinforcement shown on the drawings, shop drawings

accompanied by outlines of construction procedures, stressing sequences,

expected friction and other losses, stressing and anchoring forces, etc,

manufacturer’s mill certificates, test certificates and stress/strain curves,

results of laboratory tests and certified calibration curves for each jack

including providing the requisite number of copies of the foregoing to all

concerned.

(b) Taking all necessary field measurements. Providing facilities for

measuring the extension of tendons and movement in gripping devices.

(c) Tensioning in a sequence recommended by the pre-stressing specialist and

approved by the Engineer.

(d) All strand, grout and other tests

(e) Providing adequate protection against corrosion for all tendons

anchorages and ducts.

(f) Rates to tendons shall include for:

(i) Wrapping in suitable paper covering before dispatch for the

supplier.

(ii) Tagging wire, strand and anchorage assemblies for identification

purposes.

(iii) Cleaning, degreasing, straightening, cutting to lengths,

assembling, hoisting and fixing.

(iv) Supplying of all expendable items such as ones, wedges, anchor

plates, spacers and the like.

(v) All tensioning of members including the provision of jacks and

cutting the ends of tendons at both ends and extra material and

waste.

(vi) Filling-in to jacking or anchor recesses.

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(g) Rate for cores or ducts shall include for cleaning and drying out,

temporary supports required in the formation, forming and grouting air

holes at ends or sides of ducts, straight and curved sleeves or sheathing.

(h) Rates for formwork shall include for:

(i) All temporary boxing, forming recesses for anchorage’s

and temporary construction joints.

(ii) Any temporary restraints for tensioning and the like

(iii) Edge scaffolding and access to stressing and grouting

points.

(iv) Taking all necessary precautions and providing protective

barriers for use behind anchorages for safety reasons

(v) Taking all necessary precautions and providing protective

barriers for use behind anchorage’s for safety reasons.

(vi) Temporary fencing around stressing areas including

altering, adapting, moving, etc, from time to time in

sequence with stressing operations

(6) Precast concrete

The rates are to include for concrete, reinforcement, formwork, the formation and

filling of pokers, holes, chases and recesses for anchors, bolts and the like,

bedding, jointing and pointing in mortar or cement grout, surface finishes,

delivery, unloading, hoisting, erecting, fixing including all necessary temporary

erection gear, bracing and working platforms.

6. BRICKWORK AND BLOCKWORK

(1) Brickwork


(a) Supplying and incorporating all holdfasts and bonding ties at abutments to

concrete.

(b) All rough and fair cutting

(c) Overselling and receding courses

(d) Rough relieving and discharging arches.

(e) Wedging and pinning

(f) Raking out joins for flashing, roof coverings, etc, and pointing with

mortar.

(g) Bedding plates

(h) Bedding and pointing frames

(i) Paring and coring flues

(j) Labour eaves filling

(k) Plumbing angles

(l) Forming square and rebated reveals, cut squints or birds mouths and

notches.

(m) Forming, leaving or cutting chases, holes and mortises

(n) Cutting and pinning and/or building

(o) All making good

(p) Sundry items of a like nature.

(2) Blockwork


(a) Supplying and incorporating all holdfasts and bonding ties at abutments to

concrete

(b) All special made blocks (or brickwork and/or in-situ concrete in lieu)

(c) All rough and fair cutting

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(d) Oversailling and receding courses

(e) Free ends

(f) Plumbing angles

(g) Forming square and rebated reveals

(h) Notches

(i) Cutting and pinning at top

(j) Cutting at ends and around openings

(k) Cutting and bonding at intersections, angles and irregular angles

(l) Raking out joints for flashing, roof coverings, etc and pointing with

mortar

(m) Bedding plates

(n) Bedding and pointing frames

(o) Paring and coring flues

(p) Labour eaves filling

(q) Forming, leaving or cutting notches, chases, holes and mortises

(r) Cutting and pinning and/or building in

(s) All making good

(t) Sundry items of a like nature

(3) Centering

The rates are to include for;

(a) Strutting, shoring, bolting, wedging, easing, striking and removing.

(b) Raking cutting, curved cutting, scribed and splayed edges, notching for

key blocks, projecting voussoirs and the like

7. ASPHALT WORK


(a) Temporary screeds, running rules, grounds, arises, external angles and the

like

(b) Making good after all trades

(c) Angles, ends, intersections and the like to linear items.

8. METALWORK

(1) Welding

All welds which will be visible in completed work are to be ground to a smooth

finish flush with adjacent surfaces

(2) Rates to include


(a) Allowances for rolling margins and the weight of welding materials

(b) Cutting, notching, mitring, welding, fabricating, drilling, delivery,

unloading, handling, assembling, hoisting, fitting and fixing in position,

bedding, filling in solid and pointing including necessary lugs or other

attachments

(c) Nuts and washers to bolts

(d) Grouting bolts, anchors, fastenings, connectors and the like.

(e) Protection such as wrapping finished work with paper, coating with grease

or carrying out such other protective measures as may be required and

removing and cleaning on completion

(f) Providing samples and testing as required

(g) Preparation of shop drawings

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9. PAINTING AND DECORATING


(a) preliminary preparatory work to the surface required before the

application of any material

(b) all multi-colored work and cutting to line and bubbling down between

coats

(c) provision, erection and removal of scaffolding

(d) cutting and fitting paper, vinyl and other decorative covering around

pipes, switches, brackets and the like

(e) protection and /or masking of floors, fittings, and the like; removing and

replacing door and window furniture and removing splash and spray

marks.

10. DRAINAGE WORK

(1) Excavation rates

In addition to the factors listed at item 4 of these preambles, rates are to include

for:

(a) Backfilling and disposal of surplus soil

(b) Excavating below ground water level

(c) Keeping excavations free from all surface and subterranean water

(2) Pipework rates


(a) cutting and jointing pipes to fittings.

(b) brackets and supports to suspended pipes.

11. ROOFING

(1) Rates for roof covering shall include for all necessary plant, labour, equipment,

tools, appliances, materials, laps and for all straight, skew and circular cutting at

eaves, verges, top edges, abutments, valleys, hips, matching coloured mortar, etc

and for cutting holes for pipes and the like, sealing around openings and for

subsequent making good.

(2) Rates for waterproofing membrane and roof coverings shall include narrow

widths, small quantities, temporary rules, covering up, protecting after laying and

cleaning on completion, internal angles, all labour to form arrises, fair edges,

forming grooves, all cutting and waste, jointing between sections, working around

pipes and the like, dishing to outlets and gullies, forming collars around pipes,

sleeves and the like, sealing and making good, dressing in grooves/edges of walls,

openings in slabs, flashing, etc and for all necessary timber, cement and sand

fillets.

12. CARPENTRY, JOINERY AND IRONMONGERY

(1) Rates for carpentry work shall include for cutting, notching boring, sinking,

pelleting, fitting, trimming, mitring, halving, morticing, tenining, dovetailing,

scarfing, wedging, and for all ends, splayed edges, short lengths, temporary

supports and any other sundry items of a like nature.

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(2) Rates for carpentry works shall also include nails, screws, adhesives and plugging

(including rawl plugs and the like), forming all holes for plugging in walls, drilling

for bolts and fixing in position, etc, irrespective of the substrate materials

encountered.

(3) Rates for wallboard, hardboard, plywood and other materials of a like nature

where used for lining ceilings, walls, jambs, fittings and the like shall include for

narrow widths, small quantities, all cutting and forming holes for pipe, etc.

(4) Rates for joinery work shall include for wrot surfaces to all exposed surface, all

cutting, notching, making holes, housing ends, mitring and shaping ends, angles

and junctions. Rates shall also include for heading joints, short lengths, tongued

angles, splayed and rounded edges, chamfers rebates, grooves, punching in all nail

heads in exposed timber and filling in with matching putty, for the proper carrying

out of the work, including all necessary nails, screws, plugs and the like.

(5) Rates for ironmongery shall include for samples, fitting, cutting, sinking, boring,

morticing and for the supply of screws to match, oiling, easing and adjusting all

moving parts, taking off and refixing after painting where necessary and leaving in

perfect working order, including handing the keys properly labeled to the Architect

on completion.

13 METAL, STEEL AND IRONWORKS

(1) Rates for all structural steelwork are to include for rolling margin, welding

materials, wastages, and for all shop and site fabrication (such as welding, bolting

cutting, notching machining, splicing, etc to the lengths required); forming all

holes for connections; delivery to site (including packing, marking, shipping,

unloading, checking, handling, stacking, sorting, slinging, carnage, etc); all

hoisting to the required levels; erection (including the use of all erection

equipment, stays, braces and bolts); and all testing as specified.

(2) Rates for steel and ironwork shall include for preparing, sand blasting to remove

rust, priming with one coat of red lead primer before delivery, and all additional

touch up to primer after erection.

(3) Rates for all aluminum frames and sections shall include approved grouting inside

of hollow frames, beddings in waterproof mortar and pointing and sealing frames

with approved sealant.

(4) Rates for bolts shall include for all necessary drillings in steel, aluminium, brick,

concrete and timber.

(5) Rates for all items where applicable shall include for setting in position, building

in, tightening nuts and fixing as described.

(6) Rates for all items where applicable, shall include for cutting to length and shapes

required, mitring, scribing, welding, grinding and polishing of weldings, shop

priming before delivery and all necessary cleaning and touching up surface

coatings, etc.

(7) Rates for handrails and intermediate railings shall include for all ramps, wreaths,

bends, terminals and the like.

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14. FLOOR, WALL AND CEILING FINISHES

(1) Rates for each item of finishes shall include for protecting surfaces from weather

and damages by building operations including the provision and fixing of

polythene sheets, plywood or the like coverings where necessary.

(2) Insitu Finishings and Tiles – Rates for all types of in situ and tiling works are to

include, as applicable, for cleaning, hacking or slurring of sub base to form key,

wetting surfaces or soaking tiles before laying, ponding tests where required, for

narrow widths and small quantities and temporary rules, for all raking and circular

cutting, mitred joints, working, dressings, dishing or fitting up to and around

frames, grilles, air bricks, pipes, traps, gratings, brackets, sanitary and other

fittings and any other sundry items of like nature and for making good to this and

other trades. The provision in SMM 2 Clause 16.02 (c), 16.05 (e) & (f), 16.12 (c)

& (d) shall be deemed included.

(3) Rates for in situ work are to include for all round edges, arrises, narrow widths,

small quantities, temporary rules and making good and other sundry items of like

nature.

(4) Rates for each linear item of in situ and tiling works such as risers, moulded or

rounded edges (for tiles), channels and the like shall include for short lengths,

formed, cut and purpose made angles, junctions, ends and the like and for making

good up to and around pipes, fittings and the like and any other sundry items of a

like nature.

(5) Plastering – rates for plastering shall include for additional raking out joints of

brickwork or hacking concrete surfaces, as applicable, to form key, wetting

surfaces before application, for narrow widths, small nibs, projections and small

quantities, temporary rules, expanded metal lathing at joints between different

types of plastering. ‘Expamet’ or other equal and approved metal lathing at

junctions between concrete/bricks and other surfaces, metal or PVC beads for

forming internal angles and arises. Rates shall also include for forming quirks,

throats, grooves, V-joints, intersections, curved surfaces, rounded coves, external

angles, mitres, stops. Plastering for cornices, mouldings, enrichments and the like

shall include for all labours, templates, setting out, etc. In addition, rates shall also

include for forming of groove lines and the like complete with steel or aluminium

angles and filling with filler and/or sealant as specified.

(6) Rates for linear items of plastering such as skirtings, risers, coves, cornices,

channels and the like shall include for all short lengths, stops, angles, ends,

junctions, arrises, throats, fair edges and any other sundry items of a like nature.

(7) Rates for metal lathing (except as plastering mesh) shall include for all cutting,

holes, notchings and other sundry items of a like nature.

(8) Marble and Granite – rates for fixing shall include for all necessary preparation of

shop drawings, templates, surface preparation, cutting to size, forming chamfers,

splays, mitres, rounded edges, bull nose and other form edges finishes and the like;

including polishing all exposed edges and sealing with special sealer coatings to

the back of the slabs as specified.

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(9) Rates for fixing shall include for narrow widths and small quantities, cutting and

fitting up to or around frames, grilles, airbricks, sanitary and other fittings, pipes,

brackets and any other sundry items of like nature.

(10) Rates for fixing shall include for joints between the same materials and at the

junction of different adjoining materials, together with fillers and sealants of

specified or approved types.

(11) Where stone, marble, granite or similar finishes are specified as polished, the rates

for laying shall include for final wet and/or dry polishing on site after laying, by an

approved method, before handing over.

(12) Rates for fixing linear items of marble and granite such as skirtings, angles,

cappings, mouldings and the like are to include for short lengths, junctions, ends

and for any sundry items of like nature.

(13) Wall and ceiling linings – rates for proprietary suspended ceilings, fibrous

plasterboard and gypsum board ceilings, wall linings and the like shall include for

narrow widths, small quantities, working in panels, metal or wire suspended

system, edge trims, hangers, fastenings, anchors, connectors, clips, cleats, cutting

holes for light fittings, airconditioning grilles, ventilation devices, etc and other

sundry items of a like nature.

15. GLAZING

(1) Rates for glazing shall include for all raking and circular cuttings, waste, cleaning

all glass inside and out, replacing all cracked, scratched or broken panes,

protection and leaving in good condition on completion.

16 PLUMBING

(1) Rates for all pipework (including rainwater downpipes) shall include for all

accessories, fittings (e.g.) bends, tees, outlets, dome gratings, nozzles, sleeves,

etc), painting to pipes and fittings (unless such painting is measured separately),

cutting and waste, fixing to tiles, plastered surfaces or any surfaces with approved

pipe fixings, clips, brackets, holderbats, clamps, straps, hangers, anchor, etc as

required, provision and casting in any sleeves, brackets, nozzles etc as the work

proceeds including all necessary screws, rivets, nails, sockets, etc and for grouting

with waterproof non shrink cement grout at all openings and for filling with fire-

stopping materials where necessary, etc.

17. preambles

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