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PRELIMINARIES 1.
PRELIMINARIES
1 GENERAL
1.1 PRE-CONSTRUCTION WORK
The Engineer and Contractor will carry out a joint condition-in survey using video or digital photographs to record the condition of the site upon handover to the Contractor. This will determine the state of the site that the Contractor must hand back upon completion of the works. The Contractor will carry out a detailed site set out survey for the works.
A Pre-Construction Meeting will be held between the Engineer and the Contractor to review the following information:
- Condition-in Survey
- Site Survey
- Work Method Statement
- Program
- Schedule of Materials and Installed Equipment
If the Engineer approves the above documentation, then the Contractor will be issued with the Notice to Proceed. If the documentation is incomplete, the Contractor will have 3 calendar days to revise and resubmit the documentation for approval.
The contract period begins on the day the Notice to Proceed is issued.
The Contractor must mobilise on the project site within 7 calendar days of the date of issue of the Notice to Proceed.
Site restrictions
Site security limitations: Comply with any restrictions on site area, access or working times advised by the Engineer.
Access: Access on to and within the site, use of the site for temporary works and constructional plant, including working and storage areas, location of offices, workshops, sheds, roads and parking, is restricted to the areas shown on the drawings or as agreed with the Engineer.
Occupied areas of site or buildings For the parts of the site designated as occupied areas in the Occupied areas schedule :
- Allow occupants to continue using the area for the required period.
- Make available safe access for occupants.
- Arrange work to minimise nuisance to occupants and ensure their safety.
- Protect occupants against weather, dust, dirt, water or other nuisance, by such means as temporary screens.
Protection of persons and property Temporary works: Provide and maintain required barricades, guards, fencing, shoring, temporary roadways, footpaths, signs, lighting and traffic flagging.
Accessways, services: Do not obstruct or damage roadways and footpaths, drains and watercourses and other existing services in use on or adjacent to the site. Determine the location of such services. If damage occurs, immediately repair it at the Contractors cost.
Property: Do not damage property which is to remain on or adjacent to the site, including adjoining property encroaching onto the site. If damage occurs, immediately repair it at the Contractors cost.
PRELIMINARIES 1.
Existing services
Attend to existing services as follows:
- If the service is to be continued, repair, divert or relocate as required.
- If the service is to be abandoned, cut and seal or disconnect, and make safe.
Submit proposals to the Engineer for action for existing services before starting this work. Minimise the number and duration of interruptions.
Adjoining property Records: For properties described in the Adjoining properties to be recorded schedule :
- The Contractor is to inspect the properties with the Engineer and owners and occupants of the properties, before start of work.
- Make detailed records of conditions existing within the properties, especially structural defects and other damage or defacement.
- Arrange for at least 2 copies of each record, including drawings, written descriptions, and photographs, to be endorsed by the owners and occupants, or their representatives, as evidence of conditions existing before commencement of work.
Submit one endorsed copy of each record to the Engineer. The Contractor is to keep the other endorsed copy.
1.2 CONSTRUCTION PLANT
Access
Access route and site access point are as shown on the drawings or as agreed with the Engineer.
Use of existing services
Existing services may be used as temporary services for the performance of the contract subject to conditions stated in the Existing services schedule.
Contractors Facilities and Work Practices The Contractor is required to provide adequate toilet and washroom facilities for his staff. These facilities shall be kept clean and serviceable at all times.
The Contractor is required to provide adequate first aid equipment on-site, failure of the Contractor to ensure the availability of first aid equipment on-site will result in an immediate ‘stop work’ order being issued. All costs and time delays resulting from any such ‘stop work’ order are entirely the Contractors responsibility.
A site office will be established by the Contractor at the work site. The location of the site office will be identified by the Engineer to the Contractor. The office will have a complete set of the contract documents.
The Contractor is to maintain a safe, healthy and tidy worksite at all times and all work activities are to be performed with protective and safety equipment appropriate for the task. The Contractor is entirely responsible for workplace safety and unsafe work practices will be identified and recommendations made for revised work methods as appropriate.
Project signboards
Provide project-specific signboards and the following:
- Location, size and wording as directed by Engineer.
- Maintain in good condition for duration of the work.
- Remove on completion.
Obtain approval before display of advertisements or provision of other signboards.
1.3 BUILDING THE WORKS
Surveys Setting out: Set out the works from the dimensioned drawings
PRELIMINARIES 1.
Reinstatement
Before practical completion, clean and repair damage caused by installation or use of temporary work and restore existing facilities used during construction to original condition.
Adjoining property
At practical completion, for properties described in the Adjoining properties to be recorded schedule inspect the properties with the Engineer and owners and occupants of the properties, recording any damage that has occurred since the pre-commencement inspection.
Post construction Works The Contractor will provide the following documentation after all site construction has been completed:
- Warranty Statement
- Material Test Certificates
- As-Built Drawings
A condition-out survey will be conducted with the Contractor and Engineer at which damages caused by the Contractor will be identified. The Engineer will determine if the Contractor is to make repairs or if the damage will be deducted from the Contractor’s final invoice.
Removal of plant Within 10 working days after practical completion, remove temporary works and construction plant no longer required. Remove the balance before the end of the defects liability period.
1.5 PAYMENT FOR THE WORKS
Anticipated progress claims schedule
The Contractor is to submit a schedule of anticipated progress claims which will be made throughout the contract. Submit a revised schedule with each progress claim.
1.6 MISCELLANEOUS
Compliance with the law The Contractor is responsible for compliance with all requirements of authorities. The owner, before entering into the contract, has given the notices, paid the fees, and obtained the permits, approvals and other authorisations stated in the Prior applications and approvals schedule.
GENERAL REQUIREMENTS 1.
GENERAL REQUIREMENTS
1 GENERAL
1.1 CONTRACT DOCUMENTS
Drawings Large scale drawings take precedence over small scale drawings. Written or calculatable dimensions take precedence over scaled dimensions.
If there are any errors in dimensions, set out or size, immediately notify the Engineer.
Bill Of Quantities If there are any errors in description of items or omissions in the BOQ, immediately notify the Engineer.
If there are any items which are unclear or are not available within the project program, immediately notify the Engineer.
Services diagrammatic layouts Layouts of service lines, plant and equipment shown on the drawings are diagrammatic only, except where figured dimensions are provided or calculable.
Before commencing work:
- Obtain measurements and other necessary information.
- Coordinate the design and installation in conjunction with all trades.
Site Levels Spot levels and identified levels on drawings take precedence over contour lines and ground profile lines.
1.2 INSPECTION
Inspection Notification Schedule
The Contractor is to notify the Engineer when the items identified in the Inspection Notification Schedule are ready for inspection.
Notice Minimum notice for inspections to be made on site is 24 hours for off site personnel, 4 hours for onsite personnel.
If notice of inspection is required in respect of parts of the works that are to be concealed, advise when the inspection can be made before concealment.
1.3 SUBMISSIONS
Samples Submit nominated samples for approval of the Engineer.
If it is intended to incorporate samples into the works, submit proposals for approval. Only incorporate samples in the works which have been approved. Do not incorporate other samples.
Keep endorsed samples in good condition on site, until practical completion.
Shop drawings
General: If required, submit dimensioned drawings showing details of the fabrication and installation of services and equipment, including relationship to building structure and other services, cable type and size, and marking details.
Diagrammatic layouts: Coordinate work shown diagrammatically in the contract documents, and submit dimensioned set-out drawings.
GENERAL REQUIREMENTS 1.
translation. State if provision of proposed alternatives will necessitate alteration to other parts of the works and advise consequent costs.
3 EXECUTION
3.1 COMPLETION
Warranties
Name the owner as warrantee in conformance with the Warranty schedule. Register with manufacturers as necessary. Retain copies delivered with components and equipment.
Commencement: Commence warranty periods at practical completion or at acceptance of installation, if acceptance is not concurrent with practical completion.
3.2 OPERATION AND MAINTENANCE MANUALS
General
General: Submit operation and maintenance manuals for installations.
Format – hard copy These will be A4 size loose leaf, in commercial quality files with hard covers, each indexed, divided and titled. Include the following features:
- Cover: Identify each binder with typed or printed title “ OPERATION AND MAINTENANCE MANUAL ”, to spine. Identify title of project and date of issue.
- Drawings: Fold drawings to A4 size and accommodate them in the files so that they may be unfolded without being detached from the rings.
- Text: Manufacturers’ printed data, including associated diagrams, or typewritten, single-sided on paper, in clear concise English.
Number of copies: 3.
GENERAL REQUIREMENTS 1.
GENERAL REQUIREMENTS
1 GENERAL
1.1 CONTRACT DOCUMENTS
Drawings Large scale drawings take precedence over small scale drawings. Written or calculatable dimensions take precedence over scaled dimensions.
If there are any errors in dimensions, set out or size, immediately notify the Engineer.
Bill Of Quantities If there are any errors in description of items or omissions in the BOQ, immediately notify the Engineer.
If there are any items which are unclear or are not available within the project program, immediately notify the Engineer.
Services diagrammatic layouts Layouts of service lines, plant and equipment shown on the drawings are diagrammatic only, except where figured dimensions are provided or calculable.
Before commencing work:
- Obtain measurements and other necessary information.
- Coordinate the design and installation in conjunction with all trades.
Site Levels Spot levels and identified levels on drawings take precedence over contour lines and ground profile lines.
1.2 INSPECTION
Inspection Notification Schedule
The Contractor is to notify the Engineer when the items identified in the Inspection Notification Schedule are ready for inspection.
Notice Minimum notice for inspections to be made on site is 24 hours for off site personnel, 4 hours for onsite personnel.
If notice of inspection is required in respect of parts of the works that are to be concealed, advise when the inspection can be made before concealment.
1.3 SUBMISSIONS
Samples Submit nominated samples for approval of the Engineer.
If it is intended to incorporate samples into the works, submit proposals for approval. Only incorporate samples in the works which have been approved. Do not incorporate other samples.
Keep endorsed samples in good condition on site, until practical completion.
Shop drawings
General: If required, submit dimensioned drawings showing details of the fabrication and installation of services and equipment, including relationship to building structure and other services, cable type and size, and marking details.
Diagrammatic layouts: Coordinate work shown diagrammatically in the contract documents, and submit dimensioned set-out drawings.
GENERAL REQUIREMENTS 1.
Alternatives: If alternatives are proposed, submit proposed alternatives and include samples, available technical information, reasons for proposed substitutions and cost. If necessary, provide an English translation. State if provision of proposed alternatives will necessitate alteration to other parts of the works and advise consequent costs.
3 EXECUTION
3.1 COMPLETION
Warranties
Name the owner as warrantee in conformance with the Warranty schedule. Register with manufacturers as necessary. Retain copies delivered with components and equipment.
Commencement: Commence warranty periods at practical completion or at acceptance of installation, if acceptance is not concurrent with practical completion.
3.2 OPERATION AND MAINTENANCE MANUALS
General
General: Submit operation and maintenance manuals for installations.
Format – hard copy
These will be A4 size loose leaf, in commercial quality files with hard covers, each indexed, divided and titled. Include the following features:
- Cover: Identify each binder with typed or printed title “ OPERATION AND MAINTENANCE MANUAL ”, to spine. Identify title of project and date of issue.
- Drawings: Fold drawings to A4 size and accommodate them in the files so that they may be unfolded without being detached from the rings.
- Text: Manufacturers’ printed data, including associated diagrams, or typewritten, single-sided on paper, in clear concise English.
Number of copies: 3.
DEMOLITION 2.
DEMOLITION
1 GENERAL
1.1 INTERPRETATION
Demolished materials classes Salvaged for re-use: Demolished materials scheduled for re-use in the works.
Salvaged for disposal: Demolished materials scheduled for re-use elsewhere.
Demolished for re-use: Non-scheduled demolished materials proposed by contractor for re-use in the works.
Demolished for removal: Other demolished materials.
1.2 INSPECTION
Notice Give sufficient notice so that inspection may be made of the following:
- Adjacent structures before commencement of demolition.
- Propping of structures prior to demolition works.
- Structure after stripping and removal of roof coverings and other external cladding.
- Underground structures after demolition above them.
2 PRODUCTS
2.1 DEMOLISHED MATERIALS
Demolished materials
Ownership: Ownership of demolished materials is described in the Demolished materials classes table.
Reuse: If it is proposed to reuse demolished materials in the works, submit proposals.
Salvage: Recover without damage materials to be salvaged, for reuse in conformance with the Salvaged materials for reuse schedule or for disposal in conformance with the Salvaged materials for disposal schedule.
Removal: Remove from the site demolished materials which are the property of the contractor. Do not burn or bury on site.
Transit: Prevent spillage of demolishing materials in transit.
3 EXECUTION
3.1 SUPPORT
Temporary support
If temporary support is required, certification for its design and installation is required from a professional engineer engaged by the contractor.
Until permanent support is provided, provide temporary support for sections of existing buildings which are to be altered and which normally rely for support on work to be demolished.
Support excavations for demolition of underground structures. Provide supports to adjacent structures where necessary, sufficient to prevent damage resulting from the works.
Permanent supports If permanent supports for adjacent structures are necessary and are not described, give notice and obtain instructions.
PAVEMENT KERB, CHANNEL AND LINEMARKING 2.
PAVEMENT KERB, CHANNEL AND LINEMARKING
1 GENERAL
1.1 INSPECTION
Notice Give sufficient notice so that inspection may be made of the following:
- Set out of kerbs and channels.
- Set out of linemarking prior to painting.
1.2 TOLERANCES
Kerbs and channels conform to the following:
- Absolute level tolerance: ± 10 mm.
- Maximum deviation from design alignment: 50 mm.
- Maximum deviation from a 3 m straightedge placed on horizontal, vertical, or sloping surfaces required to be straight: 5 mm.
Linemarking to conform to the following:
- The location of markings shall not vary from the locations shown on the drawings by more than 50 mm.
1.3 INTERPRETATION
Definitions
General: For the purposes of this worksection the definitions given below apply.
- Absolute level tolerance: Maximum deviation from design levels.
- Relative level tolerance: Maximum deviation from a 3 m straightedge laid on the surface
- Channels and kerbs: Includes all forms of concrete gutters, dish drains, grated drains and mountable barrier kerbing.
2 PRODUCTS
2.1 MATERIALS
Concrete Ready-mixed concrete shall comply with M-150 (1:2:4) for non-reinforced mass concrete and M- (1:1.5:3) for reinforced concrete and the requirements of these standards.
On site batch mixed concrete shall have characteristics and proportions of concrete ingredients which conform to those specified in M-150 (1:2:4) and M-200 (1:1.5:3).
Pavement marking paint
Provide samples of pavement marking paint and technical specifications for approval by the Engineer prior to use on site.
3 EXECUTION
3.1 LINEMARKING
Setting out
Set out the work to ensure that all markings are placed in accordance with the drawings.
Surface preparation Clean dry surface: Pavement markings shall only be applied to clean dry surfaces. Clean the surface to ensure a satisfactory bond between the markings and wearing surface of the pavement.
PAVEMENT KERB, CHANNEL AND LINEMARKING 2.
Wet weather: Pavement marking shall not be carried out during wet weather or if rain is likely to fall during the process.
Provision for traffic: Provide for traffic while undertaking the work and protect the pavement markings until the material has hardened sufficiently so that traffic will not cause damage.
Mixing of paint: All paint shall be thoroughly mixed in its original container before use to produce a smooth uniform product.
Application of paint Pavement markings shall be straight or with smooth, even curves where intended. All edges shall have a clean, sharp cut off. Any marking material applied beyond the defined edge of the marking shall be removed leaving a neat and smooth marking on the wearing surface of the pavement.
Removal of pavement markings General: Remove pavement markings, no longer required, from the wearing surface of pavements without significant damage to the surface.
3.2 CHANNELS AND KERBS
General
Before placing any kerb and/or gutter, the foundation material shall be shaped and compacted to form a firm base. Where placed on pavement courses, the foundation shall be compacted to the requirements of the Pavement base and subbase worksection.
Kerb and/or gutters may be constructed in fixed forms, by extrusion or by slip forming in accordance with the drawings. The foundation, concrete quality, curing and testing details shall be in accordance with the Concrete Paving worksection.
Tolerances The level at any point on the surface of the gutters shall be within ± 10 mm of design levels. When a straight edge 3 m long is laid on top of or along the face of the kerb or on the surface of gutters, the surface shall not vary more than 5 mm from the edge of the straight edge.
Joints Contraction joints: Formed every 3 m of gutter length for a minimum of 50% of cross sectional area. The joint shall be tooled 20 mm in depth to form a neat groove of 5 mm minimum width.
Expansion joints: 15 mm in width for the full depth of the kerb and gutter. Joints shall be constructed at intervals not exceeding 15 m and where the gutter is attached to pits and retaining walls. Expansion joints shall consist of approved preformed jointing material.
Concrete pavement: Where kerbs and/or gutters are cast adjacent with a concrete pavement the same type of contraction, construction and expansion joints specified in the concrete base shall be continued across the kerb and/or gutter.
Backfill Timing: After the new kerb and gutter has been constructed and not earlier than three days after placing, the spaces on both sides of the kerb and/or gutters shall be backfilled and reinstated in accordance with the drawings.
Material: Backfill material behind the kerb shall consist of granular material, free of organic material, clay and rock in excess of 50 mm diameter.
Compaction: Backfill material behind the kerb shall be compacted in layers not greater than 150 mm thick.
SITE PREPARATION 2.
services, on ground from which free water has been removed. Prevent water flow over freshly laid work.
2.4 SITE CLEARING
Extent
Clear only the following site areas:
- Areas to be occupied by works such as buildings, paving, excavation, regrading and landscaping.
- Other areas designated to be cleared.
Contractor’s site areas: If not included within the areas specified above, clear generally only to the extent necessary for the performance of the works.
Clearing and grubbing
Remove everything on or above the site surface, including rubbish, scrap, grass, vegetable matter and organic debris, scrub, trees, timber, stumps, boulders and rubble.
Remove tree stumps and roots over 75 mm diameter to a minimum depth of 500 mm below subgrade under buildings, embankments or paving, or 300 mm below finished surface in unpaved areas. Holes remaining after grubbing shall be backfilled with sand material to prevent ponding of water. The material shall be compacted to the relative density of the existing adjacent ground material.
Old works: Remove old works, including slabs, foundations, pavings, drains and manholes found on the surface unless identified on the drawings to remain intact.
Topsoil
All topsoil shall be stripped over the area on which construction or grading takes place. This topsoil shall be carefully stockpiled to be reused for landscaping on completion of the building operations or otherwise disposed of as directed.
2.5 DISPOSAL OF MATERIALS
Disposal
General: Remove cleared and grubbed material from the site.
EARTHWORK 2.
EARTHWORK
1 GENERAL
1.1 INTERPRETATION
Definitions For the purposes of this worksection the definitions given below apply.
- Bad ground: Ground unsuitable for the purposes of the works, including fill liable to subsidence, ground containing cavities, faults or fissures, ground contaminated by harmful substances and ground which is or becomes soft, wet or unstable.
- Line of influence: A line extending downward and outward from the bottom edge of a footing, slab or pavement and defining the extent of foundation material having influence on the stability or support of the footings, slab or pavement.
1.2 RECORDS OF MEASUREMENT
Excavation and backfilling
Do not commence backfilling or place permanent works in the excavation until the following have been agreed and recorded:
- Depths of excavations related to the datum.
- Final plan dimensions of excavations.
Method of measurement: To be jointly agreed between the Engineer and Contractors Site Manager unless otherwise agreed.
1.3 INSPECTION
Notice
Give sufficient notice so that inspection may be made of the following:
- Excavation completed to contract levels or founding material.
- Filling completed to contract levels.
1.4 TOLERANCES
Tolerances Finish the surface to the required level, grade and shape within the following tolerances:
- Under building slabs and loadbearing elements: + 0, -40 mm.
- Pavement subgrades; + 0, - 60 mm.
- Other ground surfaces: �50 mm, provided the area will drain and matches adjacent construction where required.
2 PRODUCTS
2.1 FILL MATERIALS
Fill material generally
Fill material is to be inorganic, non-perishable material.
Excluded materials:
- Organic soils.
- Materials contaminated through past site usage.
- Silts or silt-like materials.
- Fill containing wood, metal, plastic, boulders or other deleterious material.
Classifications for structural fill are based on the intended use of the fill, and defined as follows:
EARTHWORK 2.
Vertical supports: Provide vertical support where necessary using piling or underpinning or both.
Permanent supports
If permanent supports for adjacent structures are necessary and are not described, give notice and obtain instructions.
3.7 PREPARATION FOR FILLING
General
Prepare the ground surface before placing fill (including topsoil fill), ground slabs or load bearing elements. Shape to assist drainage. Compact the ground exposed after stripping or excavation.
3.8 PLACING FILL
General
Layers: Place fill in maximum 15cm horizontal layers across the fill area.
Mix: Place fill in a uniform mixture.
Protection: Protect the works from damage due to compaction operations. Where necessary, limit the size of compaction equipment or compact by hand. Commence compacting each layer at the structure and proceed away from it.
3.9 COMPACTION REQUIREMENTS FOR FILL AND SUBGRADE
Density Compact the subgrade exposed by excavation to a minimum depth of 15cm. Compact each layer of fill to the required depth and density, as a systematic construction operation. Shape surfaces to provide drainage and prevent ponding.
Density of all layers of filling are to be approved by the Engineer before subsequent layers are placed.
Maximum rock and lump size in layer after compaction: 2/3 compacted layer thickness.
Moisture content Adjust the moisture content of fill during compaction in order to achieve the required density. Do not allow subgrade or fill layers to dry out after compaction before placing subsequent layers of fill. Do not over water filling to greater than moisture content of adjoining undisturbed ground.
SERVICE TRENCHING 2.
SERVICE TRENCHING
1 GENERAL
1.1 INSPECTION
Notice Give sufficient notice so that inspection may be made at the following stages:
- Service trenches excavated before laying the service.
- Services laid in trenches and ready for backfilling.
2 EXECUTION
2.1 EXCAVATING
Excavation Excavate for underground services, to required levels and grades. Generally make the trenches straight between inspection points and junctions, with vertical sides and uniform grades.
Trench widths
General: Keep trench widths to the minimum required for laying and bedding of the relevant service and construction of pits.
Trench depths If excavation is necessary below the zone of influence of the underside of adjacent footings, give notice, and provide support for the footings as instructed.
Obstructions Clear trenches of sharp projections. Cut back roots encountered in trenches to at least 600 mm clear of services. Remove other obstructions including stumps and boulders which may interfere with services or bedding.
Dewatering Keep trenches free of water. Place bedding material, services and backfilling on firm ground free of surface water.
Excess excavation
If trench excavation exceeds the correct depth, reinstate to the correct depth and bearing value using compacted bedding material or sand stabilised with 1 part of cement to 20 parts of sand by weight.
2.2 BACKFILLING
General Backfill service trenches as soon as possible after the service has been laid and bedded, if possible on the same working day. Place the backfill in layers maximum150 mm thick and compact to approval of Engineer.
Backfill material General fill with no stones greater than 25 mm occurring within 150 mm of the service, or other materials as required for particular services or locations.
Under roads and paved areas and within 4 m of building: Coarse sand, controlled low strength material or fine crushed rock.
In topsoil areas: Complete the backfilling with topsoil for at least the top 100 mm.
2.3 REINSTATEMENT OF SURFACES
General Reinstate existing surfaces removed or disturbed by trench excavations to match existing and adjacent work.
