Specification - Tunnel Waterproofing and Drainage Specification
December 21, 2016 | Author: Alhad Panwalkar | Category: N/A
Short Description
Tunnel Waterproofing...
Description
Thiess John Holland Joint Venture Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel Waterproofing and Drainage GLTSP107
Document ref BC-PBA-GLTSP107SPC-0001-0-02 20 January 2010
AFC RE-ISSUE
Thiess John Holland Joint Venture Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel Waterproofing and Drainage GLTSP107
January 2010
Parsons Brinckerhoff Arup Joint Venture ABN 88 642 968 608 Parsons Brinckerhoff Australia Pty Ltd ABN 80 078 004 798 Arup Pty Ltd ABN 18 000 966 165 Copyright 2008 Thiess Pty Ltd, John Holland Pty Ltd, Parsons Brinckerhoff Australia Pty Ltd, Arup Pty Ltd Parsons Brinckerhoff Arup Joint Venture Level 6 515 St Paul's Terrace Fortitude Valley QLD 4006, PO Box 3546 South Brisbane BC QLD 4101 Tel +61 7 3309 7500 Fax +61 7 3309 7890
This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party
Job number A125840
PB2108209A
Thiess John Holland Joint Venture
Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel - Waterproofing and Drainage GLTSP107
Contents 1
2
3
4
5
6
Page 1
General 1.1
Scope
1
1.2
Waterproofing Requirements and Methods
2
1.3
Definition of Terms
3
1.4
Standards and Related Specifications
4
1.5
Discrepancy Between Drawings and Specification
6
Quality System Requirements
7
2.1
General
7
2.2
Hold Points, Witness Points and Milestones
7
2.3
Work Method Statements
9
Waterproof Membranes
9
3.1
General
9
3.2
Preformed Polymer Membranes
11
3.3
Installation of Preformed Polymer Membrane (PPM)
15
3.4
Spray-on Membranes
17
3.5
Submissions
19
Ancillary Items
19
4.1
Waterstops
19
4.2
Penetrations / Proprietary Membrane Fixing
19
4.3
Submission Requirements
20
4.4
Re-injectable Tubes
20
4.5
Bentonite Bands
20
Geotextiles and Drainage Materials
20
5.1
Geotextiles
20
5.2
Drainage Materials
21
Concrete
22
6.1
No-fines Concrete
22
6.2
Smoothing Shotcrete
22
Tables Table 1 – Definition of terms particular to this Specification Table 2 – Hold Points Table 3 – Witness Points Table 4 – Milestones Table 5 – Work Method Statements Table 6– Pre-Production / Installation Trials Table 7- PPM (VLDPE and LLDPE) Material Mechanical and Physical Properties Table 8 - PPM (PVC-P and FPO) Material Mechanical and Physical Properties Table 9 - Spray-on Membrane Properties C:\APL-PBAJV\KIERAN.COOK\DMS47697\BC-PBA-GLTSP107-SPC-0001-0-02.DOC BC-PBA-GLTSP107-SPC-0001-0-02 20 January 2010
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Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel - Waterproofing and Drainage GLTSP107
Table 10– Geotextile Fleece for use with PPM Properties
Appendices Appendix A Verification Records Appendix B Response to Comments
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Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel - Waterproofing and Drainage GLTSP107
General This technical specification has been provided by Parsons Brinckerhoff Arup Joint Venture on behalf of Thiess John Holland Joint Venture for use in execution of the Design and Construct Contract with the Airport Link, Northern Busway and ARU project (the Project). 1.1
Scope
This specification covers the waterproofing and drainage requirements for drained and undrained tunnels. The tunnels covered by this Specification include: •
Mined (or Driven), including mainline tunnels, caverns, cross passages, ramps, substations, low point sumps and shafts.
•
TBM connections to cut and cover structures
•
Cross passages and junctions with mined tunnels and TBM tunnels
•
Substations and Sumps
The extent of drained and undrained tunnels is in accordance with the “Concept Design” 1.1.1 Exclusions The gaskets that seal between TBM segments are covered in Global – Supplementary Specification – Tunnel – Segmental Lining (reference BC-PBA-GLTSP110-SPC-0001). Drained Tunnels 1.1.2 Mined cast-insitu concrete lined drained tunnels are to be provided at the following locations:
Northbound and Southbound mainlines;
Bowen Hills cavern (at southbound tunnel off ramp)
Southbound off ramp
Lutwyche caverns (at northbound mainline tunnel off ramp and southbound mainline tunnel on ramp)
Kedron northbound and southbound caverns (at entry and exit from TBM tunnels with westbound off ramp and eastbound on ramp);
Mined tunnel cross-passages
Substations
Sumps
1.1.3 Combined Drained and Undrained Tunnels Locations where there are sections of mined cast-insitu concrete lining that transition between drained and undrained tunnels are as follows:
Kedron northbound off ramp (for northbound mainline tunnel)
Kedron southbound on ramp (for southbound mainline tunnel)
Kedron eastbound on ramp (for northbound mainline tunnel)
Kedron westbound off ramp (for southbound mainline tunnel)
1.1.4 Undrained tunnels The TBM pre-cast concrete segmental tunnel linings and associated cross passages formed using cast-insitu concrete are to be undrained tunnels.
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Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel - Waterproofing and Drainage GLTSP107
Waterproofing Requirements and Methods
1.2.1 General The tunnel waterproofing systems shall be installed in accordance with: •
the Design Drawings
•
the Specification for Tunnelling, British Tunnelling Society and Institution of Civil Engineers, June 2000” or
•
equivalent international standard and installed in accordance with the manufacturer’s specifications
Project Deed Requirements 1.2.2 The project Deed requires that: •
Any groundwater seepage into the completed tunnels and associated Project Works shall not be visible and no water shall be permitted to drip or flow onto or over road pavements, walkways, egress passages and plant and equipment rooms.
•
Permanent waterproofing treatments shall ensure that any water present on internal surfaces of the tunnels does not affect the safety, durability and function of the tunnels.
•
where leakage exceeds the limits specified by the Project Deed, the leakage shall be reduced to those specified limits
Drained Tunnels 1.2.3 The waterproofing system for the drained tunnels shall include: •
a waterproof membrane installed over the crown to shoulder level or down to the tunnel formation level
•
a lower wall drain of membrane (or approved drainage medium) from the tunnel arch to the longitudinal invert perimeter drain
•
a geotextile drainage fleece layer installed between the ground and membrane over the crown and the lower wall drain
•
the waterproof membrane type shall have a proven history and reputation for satisfactory performance in tunnels with similar groundwater conditions
•
a waterproof membrane and geotextile that is self extinguishing to minimum class E or B2 (EN ISO 1925-2 / EN 13501-1 or DIN 4102)
•
evidence obtained from the manufacturer that no components of the membrane shall leach out and deleteriously affect the durability of any of the following:
the waterproofing membrane
the geotextile drainage/protective layer
other plastic materials or PVC materials such as waterstops, etc.
1.2.4 Undrained Tunnels Undrained tunnels shall include: •
a waterproof membrane installed around the A Line of the tunnel including in the tunnel invert that has a protective layer provided over the membrane immediately after testing is completed to prevent rupture or damage during subsequent construction activities
•
waterstops that are welded to the waterproof membrane that are compatible with the type of waterproof membrane used
Mined Tunnel waterproofing system components 1.2.5 The overall tunnel waterproofing system shall comprise: C:\APL-PBAJV\KIERAN.COOK\DMS47697\BC-PBA-GLTSP107-SPC-0001-002.DOC BC-PBA-GLTSP107-SPC-0001-0-02 20 January 2010
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•
Geotextile fleece in accordance with Section 5
•
Drainage mat / net, anchor drain, strip drain and / or dimple sheet for tunnel arch / wall drainage in accordance with Section 5
•
Sheet Preformed Polymer Membrane in accordance with Section 3.2.
•
Rearguard waterstops in accordance with Section 4.1
•
Hydrophilic waterstops as required to construction joints and TBM precast segmental linings in accordance with Section 4.1
•
Grout injection tubes for post-construction grouting of joints and supplementary waterproofing elements installed in case of excessive leak detection in accordance with Section 4.4
•
Supplementary waterproofing elements such as bentonite strips and protective membrane strips at construction joints in accordance with Section 4.5
•
Compartmentalisation and termination fixings including rearguard waterstop arrangements and membrane tapes with epoxy adhesives in accordance with the design drawings.
•
Spray-on waterproofing membranes in ‘special’ areas where nominated by the Design Drawings and in accordance with Section 3.4
•
All associated fixings for membranes including any special fittings for sealing around penetrations and anchor bolts in accordance with Section 4
•
Slotted flexi-drain pipes and strip drains fixed in the shotcrete subgrade in areas where the Waterproofing Supervisor considers that the inflow of water will impede the ability to install the waterproofing membrane in accordance with this specification.
•
Slotted pipes, trench formers, inspection and maintenance pits and rockfill or gravel drainage layers / pipe-surrounds in accordance with Section 5.2.
•
No-fines concrete in areas of subgrade and invert drainage in accordance with Specification (reference BC-PBA-GLRSP301-SPC-0001).
•
Smoothing shotcrete to tunnel lining substrate surfaces in accordance with specification (reference BC-PBA-GLTSP102-SPC-0001).
•
Blinding concrete to undrained tunnel invert substrate surfaces in accordance with Specification (reference BC-PBA-GLTSP106-SPC-0001).
1.3
Definition of Terms
Definitions applicable to many specifications, including this Specification, shall include those found in the General Specification (reference BC-PBA-GLRSP000-SPC-0001). While the definitions found in the General Specification take precedence, the following definitions, when not found in the General Specification, apply particularly to this Specification: Table 1 – Definition of terms particular to this Specification Term
Definition
Design Drawings
Drawings prepared by PBA for the construction of the Works
Drained Tunnel
A tunnel where the permanent lining is enclosed over the crown to a height at or below the top of the wall panels with a waterproofing membrane to prevent groundwater seeping through the lining and over the crown. The lining is
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designed for the part of the expected full hydrostatic pressure and to direct the collected seepage groundwater to a dedicated seepage drainage system without directing it onto the roadways. Undrained Tunnel (Mined)
A tunnel where the permanent lining will be fully enclosed over its entire perimeter by a waterproof membrane that prevents the ingress of water into the tunnel and the drawdown of the ground water table.
Extrados
Exterior curve of an arch
FPO
Flexible Polyolefine Elastomer (PE-PP copolymer)
HDPE
High-density polyethylene
HDPP
High-density polypropylene
Hot Works Permit
TJH Procedure for undertaking hot works in the underground works. (Hot works include welding, flame or arc cutting, burning or heating.)
Intrados
Inner curve of an arch
LLDPE
Linear Low Density Polyethylene -
PPM
Preformed Polymer Membrane
PVC-P
Advanced plasticized Polyvinyl-chloride
Project Engineer
Person nominated by TJHJV to oversee and approve the construction of a defined portion of the Works, and to ensure that the work is in compliance with the requirements of the specifications and Quality Assurance System
Waterproofing Supervisor
Person nominated by TJHJV to oversee and approve the construction and installation of all Waterproofing Project Works for the Driven Tunnels in accordance with the Project Deed Annexure 2 Part 1 – Construction Requirements Section 2.4 Waterproofing of Tunnel Structures
VLDPE
Very Low Density Polyethylene
1.4
Standards and Related Specifications
1.4.1 General Specification The General Specification (reference BC-PBA-GLRSP000-SPC-0001) contains information required for an understanding of any and all of the specifications applicable to the Project. The General Specification shall be read prior to use of any of the other specifications, including this Specification. Standards and Related Specifications 1.4.2 This specification is to be read in conjunction with the following:
PBAJV Supplementary Specifications BC-PBA-GLRSP009-SPC-0001 Global - Supplementary Specification - Road – Projectwide Instrumentation and Monitoring BC-PBA-GLRSP301-SPC-0001 Global - Supplementary Specification - Road – No Fines Concrete Subbase C:\APL-PBAJV\KIERAN.COOK\DMS47697\BC-PBA-GLTSP107-SPC-0001-002.DOC BC-PBA-GLTSP107-SPC-0001-0-02 20 January 2010
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BC-PBA-GLSSP405-SPC-0001 Global - Supplementary Specification - Structures – Grouting for Ground Water Control BC-PBA-GLTSP101-SPC-0001 Global – Supplementary Specification – Tunnel – Rock Reinforcement BC-PBA-GLTSP102-SPC-0001 Global - Supplementary Specification - Tunnel - Shotcrete Lining BC-PBA-GLTSP103-SPC-0001 Global - Supplementary Specification - Tunnel - Mined Tunnels Excavation and Implementation BC-PBA-GLTSP106-SPC-0001 Global - Supplementary Specification - Tunnel - Cast-inplace Concrete BC-PBA-GLTSP109-SPC-0001 Global - Supplementary Specification - Tunnel - Precast Concrete for Segmental Linings BC-PBA-GLTSP110-SPC-0001 Global - Supplementary Specification - Tunnel - Segmental Lining BC-PBA-GLTSP111-SPC-0001 Global - Supplementary Specification - Tunnel - TBM Instrumentation and Monitoring BC-PBA-GLTSP112-SPC-0001 Global - Supplementary Specification - Tunnel - Opening Sets BC-PBA-GLRDR100-RPT-0100-G-02 Design Manual – Global – Drainage BC-PBA-AGGHG100-RPT-0001-G-01 Global – Geotechnical – Hydrogeology Analysis BC-PBA-AGDTR100-RPT-0001-F-02 Global – Durability Technical Report American Standards ASTM D4533 - Standard Test Method for Trapezoidal Tearing Strength of Geotextiles ASTM D1438 - Methods of Test for Pentosans in Cellulose ASTM D4487 – Standard Test Methods for Analysis of Calcium Borosilicate ASTM D4787 - Standard Practice for Continuity Verification of Liquid or Sheet Linings Applied to Concrete Substrates ASTM D6132 - Standard Test Method for Non-destructive Measurement of Dry Film Thickness of Applied Organic Coatings Using an Ultrasonic Gage Australian Standards HB 90.3 - Guide to ISO 9001:2000 AS1254 – PVE Pipes and Fittings for Storm and Surface Water Applications AS2439 – Perforated Plastics Drainage and Effluent Pipe and Fittings – Perforated Drainage Pipe and Associated Fittings European Standards BS EN 29073-3 - Methods of Test for Nonwovens Determination of Tensile Strength and Elongation BS EN 495-5 - Flexible Sheets for Waterproofing Determination of Foldability at Low Temperature - Part 5: Plastic and Rubber Sheets for Roof Waterproofing DIN EN 1876-1 - Rubber or Plastic Coated Fabrics Low Temperature Tests - Part 1: Bending Tests DIN EN ISO 527-3 - Plastics Determination of Tensile Properties - Part 3: Test Conditions for Films and Sheets C:\APL-PBAJV\KIERAN.COOK\DMS47697\BC-PBA-GLTSP107-SPC-0001-002.DOC BC-PBA-GLTSP107-SPC-0001-0-02 20 January 2010
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DIN 4102 - Fire Behaviour of Building Materials and Building Components -Requirements and Testing DIN 16726 – Perforation Test DIN 16776 – Plastic Moulding Materials; Polyethylene Moulding Materials; Classification and Designation EN1542 – Products and Systems for the Protection and Repair of Concrete Structures – Test Methods – Measurement of Bond Strength by Pull-off EN13562 - Testing of Geotextiles Part 4: Determination of Permeability of Geotextiles Normal to their Planes under Load of Constant Hydraulic Height Difference EN ISO 10319 - Geosynthetics Wide-width Tensile Test EN ISO 12236 - Geosynthetics Static Puncture Test (CBR Test) EN ISO 12956 - Geotextiles and Geotextile Related Products -Determination of the Characteristic Opening Size EN ISO 12958 - Geotextiles and Geotextile Related Products Determination of Water Flow Capacity in their Plane EN 9864 - Geotextiles and Geotextile Related Products Determination of Mass per Unit Area EN 9863 - Geotextiles and Geotextile Related Products -Determination of Thickness at Specified Pressures - Part 1: Single Layers EN 13433 - Geotextiles and Geotextile Related Products -Dynamic Perforation Test (Cone Drop Test) SIA 280 - Swiss Association of Standardisation 280 - Geomembranes – Products and Construction Material Testings Other ISO 9002 Quality Systems - Model for Quality Assurance in Production, Installation and Servicing Specification for tunnelling, British Tunnelling Society and the Institution of Civil Engineers, June 2000 DVS – 2225-2 Joint of lining membranes made of poly materials in geotechnical and hydraulic engineering – site testing NACE RP0188 – Discontinuity Testing of New Protective Coatings on Conductive Substrates Project Specific Technical Specifications PSTS03 – Drainage, Retaining Structures and Protective Treatments PSTS27 – Geotextiles (Separation and Filtration) PSTS50 – Specific Quality System Requirements 1.5
Discrepancy Between Drawings and Specification
Where a discrepancy exists between the Design Drawings and this Specification the Contractor shall seek clarification from the Construction Certifier. Drawing notes will take precedence over the Specification.
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Quality System Requirements 2.1
General
Specific quality system requirements are detailed within PSTS50. Construction activities shall be carried out in accordance with the provisions of the Contractor’s Quality System which shall comply with the requirements of AS/NZS ISO 9001. 2.2
Hold Points, Witness Points and Milestones
The Hold Points, Witness Points and Milestones particular to this Specification are listed in Table 2, Table 3 and Table 4 below respectively. Refer General Specification (reference BC-PBA-GLRSP000-SPC-0001) for Hold Point, Witness Point and Milestone definitions and requirements. The Contractor shall not proceed beyond a Hold Point until the Hold Point has been released by the person nominated in Table 2. The Contractor shall notify the relevant person when a Hold Point will be reached so that they can review and/or witness any work process, record or test being undertaken by the Contractor and thus expedite the release of that Hold Point. Table 2 – Hold Points Specification Clause
Hold Point Number
Hold Point Details
For Release By
All relevant Hold Points outlined in the Specifications and Project Deed including the hold points referred to in the QDMR Project Specific Technical Standards (PSTS) as described in Annexure 1 Part 1.
IV
Hold Points as the Contractor deems necessary to meet its obligations under the deed
Contractor
TJH shall provide necessary evidence, for the approval of the following:
3
3.1.2
1
2
•
Approval of membrane details, samples and installation methodology from the manufacturer
•
Approval of the method statement for installation of the membrane
•
Approval of the performance of the preproduction trials
•
Approval of manufacturers' specifications, warranties and guarantees prior to material production for PPM and associated materials
•
Combustibility and smoke emission class
•
Details for penetrations and corners for spray-on membrane
•
Literature/certificates for spray-on membrane including details regarding ancillary items
Survey of shotcrete smoothing layer prior to membrane installation
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Construction Certifier
Contractor Parsons Brinckerhoff Arup Joint Venture AFC Re-Issue 20 January 2010
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Specification Clause
Hold Point Number
3.3
3
Hold Point Details
For Release By
Visual inspection of shotcrete smoothing layer prior to membrane installation
Waterproofing Supervisor
3.3.1
4
Pressure testing of every welded seam
Waterproofing Supervisor or his nominated competent Membrane Welder / Installer
3.3.1
5
Inspection of membrane prior to moving form into position for casting permanent lining
Contractor
3.3.3
6
Inspection of installed membrane prior to installation of membrane protective layer before casting base slab
Contractor
4.3
7
Approval of the proposed ancillary items, including details of installation procedures for PPM
Construction Certifier
The Contractor shall provide the person nominated in Table 3 reasonable notice (minimum 24 hours or as otherwise specified) of all Witness Points so that inspection may be made of the following: Table 3 – Witness Points Specification Clause
3.3.1
3.3.1
3.3.3
Witness Point Details
For Release By
All relevant witness points the Independent Verifier deems necessary to comply with their requirement under the Deed.
IV
Witness points as the Contractor deems necessary to meet its obligations under the Deed.
Contractor
Pressure testing of welded seams (one off notification – thereafter no notification for daily work activities) Inspection of membrane prior to moving form into position for casting permanent lining (one off notification – thereafter no notification for daily work activities) Inspection of installed membrane prior to installation of membrane protective layer before casting base slab (one off notification – thereafter no notification for daily work activities)
Construction Certifier
Construction Certifier
Construction Certifier
The Contractor shall submit at the time nominated in Table 4 documentary evidence of Milestones to the Construction Certifier for approval of materials and workmanship as specified throughout the Specification. Table 4 – Milestones Specification Clause
Milestone Details
Timing
Submit proposed materials to be used
30 days prior to commencement of works to enable secondary review if required
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Work Method Statements
Work Method Statements which are required to be submitted by the Contractor to the Construction Certifier in accordance with the quality system requirements of the Contract are listed below in Table 5. The Contractor shall not vary the materials and the method statement(s) once they have been accepted by the Construction Certifier without further review and acceptance by the Construction Certifier. Table 5 – Work Method Statements Specification Clause
Work Method Statements
Construction Method Statement for Installation of Waterproofing Membranes, Ancillary Items and Tunnel Drainage Note: TBM tunnels are covered in Specification BC-PBA-GLTSP111-SPC-0001 3.2
3
Waterproof Membranes 3.1
General
3.1.1 Materials Waterproof membranes shall be sheet polymer membranes in areas where a cast-insitu concrete permanent lining is used (refer to Section 3.2).Spray-on waterproofing membranes are permitted to be installed in ‘special’ areas such as drained-cross-passages, substations, sumps and ventilation tunnels, as nominated by the Design Drawings and in accordance with Section 3.3. In all cases where waterproofing is required the Contractor shall submit a method statement and the full details as detailed in Table 3 (together with samples) of the proposed waterproofing / drainage system materials for acceptance by the Construction Certifier Hold Point 1 . The Contractor shall carry out pre-production trials to demonstrate that the materials and proposed methods of working are suitable for their intended purpose for the acceptance of the Construction Certifier as detailed in Table 6 below. Table 6– Pre-Production / Installation Trials Category of Work
Description of Trial
Spray-on Membrane
Pre-production panel in accordance with the manufacturers recommendations or as otherwise agreed with the Construction Certifier to demonstrate installation method to ensure: •
minimum thickness
•
consistency of coating
•
bonding strength (including proposed test method)
•
no water leakage (including proposed test method)
•
lapping, terminations and penetrations soundness
•
adequate repair of defects in coating (including proposed technique)
Inverts for Undrained Tunnels
Pre-installation demonstration for one 10m tunnel section of invert at the outset of invert membrane installation
Arch Crowns
Pre-installation demonstration for one 10m tunnel section of crown at the outset of arch crown membrane installation
Lower Arch Sidewalls
Pre-installation demonstration for one 10m tunnel section of Lower arch sidewall membrane (or drainage medium) installation
No materials shall be used after the manufacturer's expiry date.
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All waterproofing materials shall be stored in accordance with the relevant manufacturer’s recommendations. All waterproofing materials shall capable of resisting the environmental conditions that they are exposed to during construction and operation such that their design life is not impaired. This includes exposure to sunlight, atmospheric conditions or ultra violet light and all chemicals with which they are likely to come into contact. 3.1.2
Preparation of surfaces prior to Installation of membrane/geotextile/spay on membranes
The Contractor shall ensure that surfaces on which waterproofing systems are installed are clean, free from loose aggregate, sharp projections or any edges, projecting tying wire, release agents and other substances which are likely to damage or affect the waterproofing system in accordance with the Design Drawings and section 6.2. The Contractor shall survey the profile of the shotcrete smoothing layer to confirm it is to the correct profile and meets the requirements of the membrane prior to fixing either a separation layer of geotextile (or other approved drainage medium) or waterproof membrane Hold Point 2. The Contractor shall undertake any remedial measures required to meet the specified profiles in accordance with the relevant shotcrete work method statements. Shotcrete surfaces onto which a waterproof membrane is to be applied shall be prepared if necessary by the addition of a shotcrete smoothing layer to remove local peaks and infill hollows (reference BC-PBA-GLTSP102-SPC-0001) and to meet the manufacturer’s requirements. In areas where excessive groundwater is encountered during tunnel excavation as defined by the Waterproofing Supervisor flexi-drains or strip-drains shall be installed within the shotcrete to divert water to the invert for collection. Slotted flexi-drain pipes and strip drains fixed in the shotcrete subgrade in areas where the Waterproofing Supervisor considers that the inflow of water will impede the ability to install the waterproofing membrane in accordance with this specification. Spray on membranes shall not be used in areas where the presence of water exceeds the limits of the manufacturer’s recommendations. 3.1.3 Material Manufacturers Instructions Waterproof membranes shall be installed in accordance with the manufacturer's requirements The installation of all waterproofing systems and surface preparation as specified shall be in accordance with the material manufacturers' instructions unless a higher standard is specified in this specification or on the Design Drawings. The higher standard shall apply. Design Life and Durability 3.1.4 The components and the interaction as a total waterproofing system shall be tested both separately and together or evidence provided to demonstrate that the system meets the durability and design life of the projects in its in situ environment.
Tunnels and permanent lining including waterproofing measures shall have a 100-year design life. Manufacturers' specifications, warranties and guarantees shall be submitted to the Construction Certifier for approval prior to procurement and installation. A period of 30 days shall be allowed for such approvals. The Contractor to undertake water tests during construction to confirm that the seepage inflow is within the allowable range for PH and other contaminants compatible with the 100 year design life of the membrane and other waterproofing systems/components. Where this is not the case the Contractor shall consult with the membrane manufacturer to determine what additional s measures are required. Any additional measures shall be agreed with the C:\APL-PBAJV\KIERAN.COOK\DMS47697\BC-PBA-GLTSP107-SPC-0001-002.DOC BC-PBA-GLTSP107-SPC-0001-0-02 20 January 2010
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Thiess John Holland Joint Venture
Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel - Waterproofing and Drainage GLTSP107
Construction Certifier prior to implementation and be subject to all of the conditions of this specification 3.1.5 Interaction with the Environment The Contractor shall obtain information from the manufacturer(s) to demonstrate that the waterproofing systems shall have no significant effect (short-term or long-term) on any part of its environment, and must not provide any hazard to, or degradation of, the groundwater quality or potability. 3.2
Preformed Polymer Membranes
3.2.1 Materials Preformed Polymer Membrane (PPM) shall consist of heat welded sheets of any of the following materials: •
high-density polyethylene (HDPE) – as per DIN 16776 Parts 1 and 2
•
linear low-density polyethylene (LLDPE) – Refer to Table 8
•
very low-density polyethylene (VLDPE) – Refer
•
to Table 8
•
advanced plasticized polyvinyl-chloride (PVC-P) – Refer to Table 9
•
flexible polyolefine elastomer (FPO) – Refer to Table 9
PPM shall have the mechanical and physical properties specified in Table 7 and Table 9 in both the longitudinal and transverse directions. PPM may be used as a waterproof barrier for all, drained or undrained, underground tunnels structures, shafts and portal headwalls (excluding TBM driven tunnels) The membrane shall be supplied with a signal layer, i.e. a thin layer of different colour, bonded to one side, which is intended to facilitate the detection of damage Where reinforced concrete and/or embedded steelwork is to be placed against the waterproofing membrane a signalling layer, to give a visual indication of any mechanical damage, shall be provided on the exposed surface of the waterproofing membrane. The signalling layer shall be such that it does not adversely affect the seam welds. Evidence shall be obtained from the manufacturer that no components of a PPM leach out in the long term such that the durability of any of the following components is adversely affected: •
the waterproofing membrane
•
the geotextile drainage/protective layer
•
other plastic materials or PVC materials such as waterstops
PPM shall be self extinguishing in accordance with Table 7 and Table 8. The Contractor shall submit details of the combustibility and smoke emission class of the membrane and geotextile fleece to the Construction Certifier for consent. At present HDPE or HDPP are not proposed to be used by the Contractor.
C:\APL-PBAJV\KIERAN.COOK\DMS47697\BC-PBA-GLTSP107-SPC-0001-002.DOC BC-PBA-GLTSP107-SPC-0001-0-02 20 January 2010
Page 11
Parsons Brinckerhoff Arup Joint Venture AFC Re-Issue 20 January 2010
Thiess John Holland Joint Venture
Airport Link | Northern Busway | EWAG Global - Supplementary Specification - Tunnel - Waterproofing and Drainage GLTSP107
Table 7- PPM (VLDPE and LLDPE) Material Mechanical and Physical Properties Tests
Requirements
Thickness (Undrained Tunnels)
as per DIN 53370 Minimum 2mm at 5% strain Invert – 2mm to 3mm
Thickness (Drained Tunnels)
as per DIN 53370 Minimum 1.5mm or 2mm at 5% strain Arch Crown 2mm Lower arch wall 1.5mm to 2mm
Tensile strength in N/mm2
as per DIN EN ISO 527·3 longitudinally min. 12 N/mm2 transversely min. 12 N/mm2 alternatively as per DIN 16726 min. 15 N/mm2 (long, &trans)
Elongation at tear strain in%
as per DIN EN ISO 527·3 min. 300% (long &trans)
State during and following storage at 80°C:
as per DIN 16726 or alternatively as per SIA 280
General
No blister formation
Change in Dimensions
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