PVC Specifications

Part 1 - General

The following specifications are for the supply and installation of flexible plasticized PVC membrane waterproofing systems for use in underground construction to prevent the infiltration of water into the structure.

The waterproofing membrane shall be a bi-color flexible polyvinyl chloride (PVC) sheet membrane. The membrane is to be installed over a geotextile layer which provides drainage and protects the membrane from substrate damage.

All seams are to be welded and tested to insure a watertight homogeneous seal of the membrane system. A final structural lining will then be placed against the membrane waterproofing system.

Different tunnel construction methods require different methods of installation and variances in the product specifications. The following specifications are only guidelines, each project must be closely evaluated prior to the development of the final project specifications.

1.01 PRODUCT QUALITY ASSURANCE
A. The flexible PVC membranes shall have been manufactured and marketed successfully for at least ten (10) years, including a total square footage installed of not less than twenty million (20,000,000) square feet on not less than seventy-five (75) construction projects.

B. The installer of the waterproofing membrane system must have five (5) years experience in the installation of flexible membranes in underground tunnel waterproofing applications.

Submit evidence that the waterproofing installer has been involved in three (3) successful waterproofing projects over the last five (5) years. Include the owner's name, location of project, square feet of product installed and completion date. Non-compliance will make the bid invalid.

C. The waterproofing membrane and geotextile manufacturers must supply to the engineer a certificate certifying that the materials meet the specified product requirements.

D. The waterproofing membrane manufacturer and installer must be approved by the engineer to product shipment or installation.

1.02 SCOPE OF WORK
Provide and install a waterproofing membrane system including, but not limited to:

A. General application specification
B. Substrate surface preparation
C. Application of geotextile layer
D. Application of waterproofing membrane

1. Tunnel Invert
2. Tunnel Arch
3. Penetrations
4. Breakouts/Crosspassages
5. Portal Area

E. Welding of waterproofing membrane
F. Testing of welded joints
G. Specialty applications/grid system

1.03 SUBMITTALS
The Contractor shall submit the following items to the Engineer for approval.

A. Samples, physical properties of all material specified, each properly labeled.

List of Sample Requirements:

1. Waterproofing Membrane 12" X 12"
2. Weld Seam 12" in length
3. Geotextile 12" X 12"
4. Membrane Attachment Discs - 2 required welded to membrane
5. Waterstop/Flashing 12" in length

B. Material Certifications by the producers of the waterproofing materials that all material supplied comply with all the requirements of the project specifications.

C. Shop drawings of typical waterstops. showing cross section, lengths, joints, terminations and methods of attachment.

D. Specimen copy of manufacturer's material warranty.

E. Copies of all current manufacturer's product literature.

F. Submit experience requirements as noted in Part I - General.

1.04 DELIVERY, STORAGE AND HANDLING

A. Handle all materials to prevent damage. Material, when off-loade, should be placed on a smooth surface free of rocks or other protrusions which may damage the material. No special covering is necessary unless product will be exposed and unused for more than six (6) months. If this is the case, canvas tarpaulins, or other suitable materials, can be used as a protective cover.

B. Store all materials in a location in close proximity to the tunnel portal or access shaft area to minimize transportation and handling. Storage space should be protected from theft, vandalism and passage of vehicles. Applicable primers, cements, coatings and sealants shall be marked with date of manufacture and show a date of shelf life. Products shall not be used beyond shelf life dates. Do not dilute primers, roofing cements, adhesives, coatings or sealants. Keep containers closed except when removing materials from them.

C. All flammable materials shall be stored in a cool, dry area away from sparks and open flames. Follow precautions outlined on container or supplied by material manufacturer or supplier.

D. Any materials that are damaged or rejected shall be promptly removed.

1.05 PROJECT CONDITIONS

A. The tunnel is to be clear of all debris and obstacles which may interfere with the application of the waterproofing system.

B. All surfaces to which waterproofing membrane is to be applied must be kept clean, with protrusions removed or covered to specifications.

1.06 SEQUENCING OF WORK

Work in conjunction with other trades by timely performance of the work. Coordinate with other trades to minimize disruptions and avoid traffic over completed membrane surfaces.

1.07 WARRANTY

The waterproofing membrane manufacturer shall provide its standard ten (10) year material warranty.

PART 2 - PRODUCTS

2.01 MANUFACTURERS

A. The manufacturer of the PVC waterproofing membrane system shall have a demonstrated track record of producing and marketing waterproofing membranes for underground applications of at least ten (10) years.

B. All components of the waterproofing system shall be as manufactured by, or accepted by, the membrane manufacturer and membrane applicator.

C. Requests to substitute material for waterproofing other than those specified in the bid documents must be submitted to the engineer for possible acceptance for four (4) weeks prior to bid date. Non-compliance with this format will disqualify the bidder.

2.02 TUNNEL WATERPROOFING MATERIALS

A. PVC Membrane

The PVC waterproofing membrane is to be made of specially plasticized polyvinyl chloride. The material is to be supplied in accordance to the attached specification sheet.

B. Geotextile

The geotextile shall be 100% non-woven polypropylene consisting of long chain polymeric filaments, years or staple fibers formed into a stable network of uniform thickness and surface texture. The material is to be supplied in accordance to the attached specification sheet.

C. Membrane Attachment Discs

Discs are to be manufactured of PVC, minimum (3") in diameter, with (1) steel washer imbedded in the disc. The disc is to be attached with 1 1/4" steel nails.

D. Waterstops/Waterbarriers

Continuous PVC strip for terminating detail, the minimum width, with embedments ribs, shall not be less than twelve (12) inches.

E. Protection Layer

a. In the tunnel invert, a protection layer may be required to protect the membrane waterproofing system from damage by other trades prior to the placing of the final lining.

The protection layer (see section D, 6-(b) of the section) will be installed as directed by the installer and approved by the engineer.

The protection later is the responsibility of the general contractor and/or the waterproofing membrane installer.

b. Approved Protection Layer Material

(1) Non-reinforced concrete 5" minimum thickness
(2) PVC membrane equal to the specified material and thickness


PVC Specifications

PART 3 - APPLICATION PROCEDURE

A. GENERAL
1. The application procedure for the waterproofing membrane system must be capable of dealing with the following methods of underground construction.
a. Drill and Blast Tunnel Construction
b. Bored Tunnels in Rock
c. NATM Construction
d. Rib and Board Tunnel Construction
e. Precast Concrete Segments
2. The installer shall comply with manufacturer's most recent printed specifications and suggested installation procedures.
3. All damaged areas must be repaired in a timely manner in accordance to specified repair procedures.
4. No application can begin without the approval of the engineer.
In the approval submittal to the engineer, the following steps in the application of the waterproofing membrane must be addressed.
a. Substrate surface preparation.
b. Application of geotextile layer.
c. Application of waterproofing membrane.
d. Welding of waterproofing membrane.
e. Testing of waterproofing membrane.
f. Application of protection layer (optional).

B. SUBSTRATE SURFACE PREPARATION - GENERAL
The substrate surface must be prepared in accordance to the following procedures:

1. Drill and Blast Tunnel Construction
a. Remove all loose soil and debris from the tunnel. Cover all surfaces with shotcrete to a minimum thickness of three inches (3") to provide a smooth surface for the application of the waterproofing membrane. Shotcrete to be applied in such a way that within a distance of 5'-0", depressions shall not exceed a dept of twelve inches (12").
As the surface preparation is the responsibility of the general contractor, care should be taken to minimize overbreak during excavation.

b. All rockbolts or similar protrusions into the tunnel are to be capped and/or shotcreted to meet specifications per section 1-A.

2. Bored Tunnels in Rock
a. Remove all loose soil and debris from the tunnel. Fill all voids with shotcrete, or engineer approved alternate, in such a way taht within a distance of 5'-0", depressions shall not exceed a depth of twelve inches (12") from the bored diameter.

b. All rockbolts or similar protrusions into the tunnel are to be capped and/or shotcreted to meet specifications per section 2-A.

3. NATM Construction
a. Remove all loose soil, shotcrete and debris from the tunnel. Cover all surfaces with shotcrete to a minimum thickness of three inches (3") to provide a smooth surface for the application of the waterproofing membrane. Care is to be taken when lattice girders and/or spilling has been used to insure these areas obtain the three inch (3") coverage. Shotcrete to be applied in such a way that within a distance of 5'-0", depressions shall not exceed a depth of twelve inches (12")
b. All rockbolts, or similar protrusions into the tunnel, are to be capped and/or shotcreted to meet specifications per section 3-A.

4. Rib and Board Tunnel Construction

Remove all loose soil and debris from the tunnel. All bolting for the ring should occur between the flanges. Any bolts and/or butt plates which protrude into the tunnel more than one-half inch (1/2") must be covered with shotcrete or mortar in such a way that no metal or sharp edges are observed. Any measured angle of a covered protrusion shall not have an angle less than forty-five (45) degrees.

5. Precast Concrete Segments

a. Remove all loose soil and debris from the tunnel. Repair all damaged segments such that there is no opening larger than two inches (2") in diameter and no offset greater than two inches (2") from the inside profile of the segment.

b. All precast repair procedures are to be submitted to the engineer prior to the start of work for approval.

6. Final Approval of Subgrade Surface

Waterproofing application is not to proceed the surface preparation is completed to the satisfaction of the waterproofing installer and the engineer and in accordance to project specifications.

C. Application of Geotextile Layer in:

-Drill and Blast Tunnel Construction
-Bored Tunnels in Rock
-NATM Construction
-Precast Concrete Segments

1. The geotextile material is to be manufactured from 100% polypropylene resin to form a non-woven continuous filament geotextile fabric no less than twenty-two (22) ounces/square yard with a minimum thickness not less than two hundred eighty-five (285) mils in accordance to project specifications.

2. Tunnel Invert

Apply geotextile to the tunnel invert by the use of disc fasteners in a patter with a minimum quantity of one (1) disc per ten (10) square feet.

3. Tunnel Arch

Apply geotextile to the tunnel arch by the use of disc fasteners in a pattern with a minimum quantity of two (2) discs per ten (10) square feet. If depressions exist in the arch, the discs should be located in these areas.

C-1. Application of Geotextile Layer in Rib and Board Tunnel Construction

1. The geotextile material is to be manufactured from 100% polypropylene resin to form a non-woven continuous filament geotextile fabric no less than twenty-eight (28) ounces/square yard with a minimum thickness not less than four hundred (400) mils in accordance to project specifications.

2. Tunnel Invert

Apply geotextile to the tunnel invert by the use of the disc fasteners in a pattern with a minimum quantity of one (1) disc per ten (10) square feet.

3. Tunnel Arch

Apply geotextile to the tunnel arch by the use of disc fasteners in a pattern with a minimum quantity of two (2) discs per ten (10) square feet.

D. Application of Waterproofing Membrane in:

-Drill and Blast Tunnel Construction
-Bored Tunnels in Rock
-NATM Construction
-Rib and Board Tunnel Construction
-Precast Concrete Segments

A flexible PVC membrane is to be manufactured and supplied in accordance to project specifications.

1. Tunnel Invert

The membrane is to be installed in such a manner as to reduce the number of joints. The membrane is to be welded to each previously installed disc fastener. Minimum PVC thickness shall be 3.0 mm

2. Tunnel Arch

The membrane is to be installed as one continuous piece from invert to invert with the membrane width not to exceed 2.0 (6'-6"). The membrane is to be welded to each previously installed disc fastener. Minimum PVC thickness shall be 1.5 mm.

3. Penetrations

The applicator is to submit a shop drawing detailing how each type of penetration is to be sealed. Work can not proceed until approved by the engineer.

4. Breakouts/Crosspassages

A waterstop is to be installed when the membrane ends at any location. The membrane is to be hot air welded to a waterstop on each side. The waterstop is to be the same material as the membrane. Prior to the start of work, a shop detail drawing is to be submitted to the engineer for approval.

5. Portal Area

The applicator is to submit a shop drawing detailing how the waterproofing is to be terminated in these areas. Work can not proceed until approved by the engineer.