SPECIFICATION 1392 TRENCHLESS CONDUIT · PDF fileSPECIFICATION 1392 – TRENCHLESS CONDUIT INSTALLATION ... Method statement ... 1361 Sewerage systems

Hornsby Shire Council

ABN 20 706 996 972 PO Box 37, Hornsby NSW 1630 Phone 02 9847 6666 Email [email protected]

296 Peats Ferry Rd, Hornsby 2077 Fax 02 9847 6999 Web hornsby.nsw.gov.au

SPECIFICATION 1392

TRENCHLESS CONDUIT INSTALLATION

© AUS-SPEC (Oct 11) July 2016

1392 Trenchless Conduit Installation

© AUS-SPEC (Oct 11) HORNSBY SHIRE COUNCIL

SPECIFICATION 1392 – TRENCHLESS CONDUIT INSTALLATION

CLAUSE CONTENTS PAGE

GENERAL ............................................................................................................................................................ 1

1.1 RESPONSIBILITIES ............................................................................................................................. 1

1.2 CROSS REFERENCES ........................................................................................................................ 1

1.3 REFERENCED DOCUMENTS ............................................................................................................. 1

1.4 INTERPRETATIONS ............................................................................................................................ 1

1.5 SUBMISSIONS ..................................................................................................................................... 2

1.6 INSPECTIONS ...................................................................................................................................... 2

PRE-CONSTRUCTION PLANNING .................................................................................................................... 3

2.1 SCHEDULING ....................................................................................................................................... 3

MATERIALS ......................................................................................................................................................... 3

3.1 CONDUIT AND PIPEWORK ................................................................................................................. 3

EXECUTION ......................................................................................................................................................... 3

4.1 GEOTECHNICAL .................................................................................................................................. 3

4.2 EXISTING SERVICES .......................................................................................................................... 4

4.3 TRENCHLESS METHODOLOGY ........................................................................................................ 4

4.4 INSTALLATION ..................................................................................................................................... 4

4.5 TOLERANCES ...................................................................................................................................... 5

4.6 COMPLETION ....................................................................................................................................... 5

4.7 LIMITS AND TOLERANCES ................................................................................................................. 5

MEASUREMENT AND PAYMENT ...................................................................................................................... 5

5.1 GENERAL ............................................................................................................................................. 5

1392 Trenchless conduit installation

© AUS-SPEC (Oct 11) 1 HORNSBY SHIRE COUNCIL

1392 TRENCHLESS CONDUIT INSTALLATION

1 GENERAL

1.1 RESPONSIBILITIES

Objectives General: Provide conduit, pipework and pits as documented on the drawings.

1.2 CROSS REFERENCES

General Requirement: Conform to the following:

- 0136 General requirements (Construction).

- 0161 Quality (Construction) 0161.

1.3 REFERENCED DOCUMENTS

The following documents are incorporated into this worksection by reference:

Standards AS 1074-1989 Steel tubes and tubulars for ordinary service AS 1726-1993 Geotechnical site investigations AS/NZS 2053:various Conduits and fittings for electrical installations AS/NZS 2053.2:2001 Rigid plain conduits and fittings of insulating material AS/NZS 2053.4:1995 Flexible conduits and fittings of insulating material AS/NZS 2053.7:2002 Rigid metal conduits and fittings AS/NZS 2053.8:1995 Flexible conduits and fittings of metal or composite material AS/NZS 4058:2007 Precast concrete pipes (pressure and non-pressure) Other publications Australian Society for Trenchless Technology (ASTT) Guidelines for horizontal directional drilling, pipe bursting microtunnelling and pipe jacking

International Society for Trenchless Technology (ISTT) (Represented in Australia by the Australasian Society for Trenchless Technology) Glossary of trenchless terms, 2005

1.4 INTERPRETATIONS

Abbreviations General: For the purposes of this worksection the following abbreviations apply:

ASTT: Australasian Society for Trenchless Technology.

HDD: Horizontal directional drilling.

MT: Microtunnelling.

Definitions General: For the purposes of this worksection the definitions given in ASTT Guidelines for horizontal directional drilling, pipe bursting, microtunnelling and pipe jacking apply. Available at www.astt.com.au.

1.5 SUBMISSIONS

Performance Requirement: Ensure that the conduit and all aspects of the work meet the performance requirements detailed in this worksection.

Method statement Methodology: Submit a Method Statement including the following items as a minimum requirement:

- General description of method and sequence of operation.

- Procedures to deal with geotechnical conditions.

- Specialist subcontractors to be utilised.



- Conduit type and specification, including compliance with relevant Australian Standard and suitability to withstand the jacking forces.

- Jointing type and specification.

- Grout type, if required, methodology and equipment for grout injection.

- Mechanical description of any motorised pumping, jacking, horizontal boring, directional drilling or mining equipment intended for use.

- Existing underground utility services:

. Treatment at conflict locations.

. Protection of services in zone of influence.

- Survey equipment and methods.

- Direction of installation of conduit.

- Size, depth and position of temporary access pits required.

- Location of temporary spoil site if required and nature of haulage equipment.

- Programmed daily working hours and duration for the operation.

- Strategy for dealing with noise pollution problems.

- Traffic management.

- Dewatering.

Acceptance criteria General: All submissions will be subject to the approval of the Superintendent.

Documents Submit the following for approval:

- Materials: Off-site certificates of components.

- Calculations: Survey set out of service conduit works and quantity calculations.

- Work-as-executed drawings: Include service conduit system information sheets and works.

- Components: Conduits and fittings.

- Samples: For conformity testing to relevant Standards.

- Technical data: Product information.

- Execution details: Refer to HOLD POINTS.

1.6 INSPECTION

Notice General: Give notice so that the inspection may be made of the following:

Summary of HOLD POINTS

Clause title/Item Requirement Notice for inspection Release by

MATERIALS

Conduits and pipework - General

Documentary evidence 1 week Superintendent

EXECUTION

Installation - Bulkheads

Inspection 2 working days Superintendent

Summary of WITNESS POINTS – On-site activities

Clause title/Item Requirement Notice for inspection

EXECUTION

Completion - General Inspect pits are clean of debris and lids secure

Progressive



2 PRE-CONSTRUCTION PLANNING

2.1 SCHEDULING

Program of works General: Program the works as follows:

- Materials: Arrange the program for compliance and usage of component and materials.

- Authorities: Arrange approvals and conform to the environmental requirements.

3 MATERIALS

3.1 CONDUITS AND PIPEWORK

General Conduits and pipework: To 1341 Water supply – reticulation and pump stations (Construction), 1352 Pipe drainage, 1361 Sewerage systems – reticulation and pump stations (Construction) and 1391 Service conduits.

Verification: Provide certificates of conformance for all conduits and pipework materials that they are suitable for the proposed method of trenchless installation in conformance with manufacturer’s recommendations. Provide load testing for the conduit or pipework to the following appropriate standards:

- Precast concrete: To AS 4058.

- Heavy duty UPVC: To AS/NZS 2053 series.

- Rigid plain conduits and fittings: To AS/NZS 2053.7.

- Flexible conduits and fittings of metal or composite material: To AS/NZS 2053.8.

- Heavy duty galvanised steel tube: To AS 1074.

- Heavy duty rigid UPVC: To AS/NZS 2053.2.

- Flexible conduit: To AS 2053.4.

This is a HOLD POINT.

4 EXECUTION

4.1 GEOTECHNICAL

General Detailed geotechnical investigations: To AS 1726 to distinguish rock, soil, sand, obstructions and water table. This information will influence the methodology proposed for trenchless installation.

Geotechnical investigation report: Evaluate the supplied geotechnical information and submit notification if there is any additional information required.

4.2 EXISTING SERVICES

General Requirement: Contact Dial 1100 BEFORE YOU DIG. This is a free service from anywhere in Australia of identifying underground pipe and cables (possible within two working days). See www.1100.com.au. Confirm this contact in the Method Statement.

Locations: Obtain locations of water, sewer, stormwater, gas, electricity and telephone services. For example: When working around the vicinity of telecommunications plant conform to the ‘Duty of Care’ document provided by Telstra for essential precautions and approach distances.

For all Telstra DBYD (Dial Before You Dig) enquiries, contact Telstra Plan Services via email – [email protected] and Phone: 1800 653 935 for urgent, onsite or optic fibre enquiries.

Services verification: Contact the Utility Authorities’ contact names listed in 0179 General requirements (Construction) to verify the location of services, during the preparation of the Method Statement.



4.3 TRENCHLESS METHODOLOGY

General Required method: Select from the following options:

- Horizontal directional drilling ASTT specification.

- Pipe bursting ASTT specification.

- Microtunneling and pipe jacking ASTT specification.

Methodology: Propose method of installation best suited to the project and the supplied information as follows:

- Geotechnical assessment.

- Alignment and level design.

- Type of pipe/conduit.

- Type of system.

- Crossing location.

- Pipeline route.

Trenchless assessment guide: Provide any computer analysis performed for the methodology assessment of the project.

4.4 INSTALLATION

General Concrete work: To 0319 Minor concrete works.

Permanent and temporary pits or access chambers: To 1351 Stormwater drainage (Construction).

Restoration of surfaces of temporary pits: To 1152 Road openings and restoration (utilities).

Bulkheads Bulkheads: Construct bulkheads in conformance with the drawings or as nominated in the proposed methodology. Provide bulkheads and any necessary grouting prior to commencing any construction of adjacent conduits. This is a HOLD POINT.

Methodology General: Provide for the following performance requirements:

- The installation of the conduit by open trenching is not permitted within the length designated for trenchless techniques.

- If appropriate, eliminate voiding around the conduit by grouting prior to completion of works, with material and methodology of grouting described in the Method Statement.

- The line and grade of the conduit: Conform to the drawings within the tolerances indicated on the Drawings or stated in Tolerances when not explicitly shown on the drawings.

- All joints flush to the internal conduit walls and watertight after installation.

- After installation of the conduit laid by trenchless techniques and prior to any grouting procedures, provide bulkhead walls at locations shown on the drawings and conforming with Bulkheads.

- Ensure that the installation of the conduit does not affect any adjacent building foundations and will provide for consistent support before, during and after installation.

- Prevent endangerment of the stability or health of the root systems of trees designated for maintenance with Council’s Tree Preservation Officer.

- Provide a register of training and experience for the contractor’s personnel.

Protection measures Protection: Protect adjacent buried pipes or sensitive surface structures.

Protection measures: Select from the following options:

- Access chambers.

- Surface movement monitoring devices.

4.5 TOLERANCES

Requirements General: Install the conduit in conformance with the horizontal and vertical alignment shown on the Drawings subject to the following definition of tolerances:



- Determine by registered survey the position of both the inlet and outlet of the conduit to conform with the drawings for horizontal position to a tolerance of 30 mm.

- Vertical tolerance at the inlet/outlet of the conduit where installation commences: 10 mm.

- The average grade of the conduit to conform with the grade as shown on the drawings: 0.05%.

- The conduit alignment at all joints: 5 mm deflection in any direction at 1.5 m from the joint.

4.6 COMPLETION

General Work-as-executed drawings: Record the locations of all conduits.

Pits: Clean of debris and fit lids securely. This is a WITNESS POINT.

Testing Ovality: Test completed conduits for ovality tolerances to manufacturers requirements.

CCTV: Provide CCTV footage for installed pipeline and conduit.

4.7 LIMITS AND TOLERANCES

Application Summary: The limits and tolerances applicable to this worksection are summarised in Summary of limits and tolerances table.

Summary of limits and tolerances table

Activity Limits/Tolerances Worksection Clause/ subclause

Conduit position – inlet/outlet

Horizontal ± 30 mm Tolerances/Requirements

Vertical ± 10 mm Tolerances/Requirements

Conduit grade ± .05% Tolerances/Requirements

Conduit alignment at joints - Deflection 1.5 m from joint

± 5 mm Tolerances/Requirements

5 MEASUREMENT AND PAYMENT

5.1 GENERAL

Payment shall be made for all the activities associated with completing the work detailed in this worksection and shown on the drawings, in accordance with provisions made in contract document.