1. Excellent Performance
FM Approved, high tensile strength, high elongation, can adapt to
the base deformation, of excellent high and low temperature
performance, can be suitable for the use in different
environmental.
2. Strong Aging Resistance
Long service life, good anti-aging performance.3. Excellent Weldability
With excellent weldability, and welding quality can be guaranteed.
4. High Plasticity
Good puncture resistance, strong root penetration resistance, can
be applied to planting roof. For its good plasticity, it's
convenient to do details treatment around edge and corner areas.
5. Safe & Environmental-friendly
The construction is simple, fast and environmentally friendly
without pollution.
※ Scope of Application
It is applicable to expose and non-exposed roofs of steel
structures and concrete structures.
It applies to waterproof engineering of basement and subway,
tunnels, dams, tailing dams, etc.
※ Waterproofing Structure for Tunnel with Bondsure™ PVC Tunnel Membrane
※ Method Statement
※ 1. General
Joaboa Tech Tunnel Waterproofing System consists of a homogeneous
PVC-H flexible sheet applied by disks on the polypropylene
regularization layer and protected (where required) by PVC-H
protection layer. The waterproofing system shall be partitioned by
waterstop placed along the construction joint and welded, dividing
the tunnel in watertight section able to confine water inflow
coming from the possible damages occurred during the construction
phases.
It has been used in some overseas government tunnel projects, like,
in Thailand, Peru, etc.
Thailand Map Kabao-Thanon Chira Junction 2.00mm PVC Tunnel
Waterproof Project
Machu Picchu Railway Tunnel Project (in Peru)
The following document describes the installation procedure for the
Joaboa Tech Tunnel Waterproofing System.
※ 2. Installation Process
Joaboa Tech Tunnel Waterproofing System shall be in compliance with
the following steps:
Acceptance of the Substrate;
Installation of the Regularization Layer and Disks;
Installation of the PVC Waterproofing Membrane;
Installation of the Waterbar (partitioning);
Installation of the Re-injectable Hoses (backup system and crown
injection point)
Installation of the Protection Layer (where required);
1) Acceptance of the Substrate
Prior to commencing membrane installation works, a final inspection
of the tunnel surfaces to be lined shall be completed. An
"Acceptance of Membrane Substrate Surface" checklist shall be
completed to record and identify that the area of membrane
installation is compliant with the following substrate
requirements:
Shotcrete surfaces shall be prepared applying an additional
shotcrete smoothing layer in order to remove local peaks and
troughs.
Surfaces on which waterproofing systems shall be installed shall be
clean, free from loose aggregate, sharp protrusions, projecting
tying wire, release agents and other items which are likely to
damage or affect the waterproofing system.
The shotcrete surfaces are prepared so as to achieve the smoothness
and regularity required to preserve the membrane integrity. The
substrate shall be in compliance with the following relationship:
2) Installation of the Regularization Layer and Disks
The geotextile regularization layer shall be applied to the
shotcrete surface using steel fixings (nails + washer). The
regularization layer shall be laid with sufficient slack to avoid
overstress during the concrete's pouring. Geotextile layer shall be
joined with the next one using a spot welding, and the overlap
shall be 100 mm. We recommended to not exceed the width of 100 mm
overlap in order to avoid "pocket effect" in the overlap area.
The diameter of the washer shall be checked before the installation
phases in order to verify that the diameter of the nail is
compatible with the internal diameter (26 mm) of the disk. The
average of the fixing point number shall be 4 disks per square
meter. The number and distribution of fixing point shall be
evaluated by application team leader and it depends on substrate
profile, overlaps, waterstops and anchoring position.
3) Installation of the Bondsure PVC Tunnel Waterproof Membrane
The waterproofing membrane shall be installed around the perimeters
of the
excavation to cover the geotextile following the procedure below:
Waterproofing membrane shall be attached to the disk by a spot
welding. Check always the position of the PVC sheet according to
the previously one installed in order to provide the correct
overlap width (automatic welding machines working range). The
waterproofing membrane shall be laid with the signal layer towards
the inside and with sufficient slack to prevent overstressing
during concrete pouring.
Join the waterproofing sheet using the Tunnel Crawl welding machine
with the parameters correctly set.
Make sure the 10cm overlap.
4) Installation of the Waterbar (partitioning)
Waterstop shall be applied along the construction joint following
the procedure below:
In order to carry out the welding correctly the watorstop back and
the membrane surface shall be clean and free of dust.
If dirty the welding area shall be clean.
Apply the waterstop on the PVC waterproofing membrane positioning
it in the predicted section using a spot welding. The number of
spot welding shall be enough to hold up the waterstop avoid to
overstressing of PVC membrane;
Realize the watertight welding on each side of the waterstop for a
total width of 40-50 mm;
Junction shall be realized using waterstop welding jig.
5) Installation of the Re-injectable Hoses
Re-injectable hoses (both for backup system and crown injection
point) shall be installed according both the technical data sheet
and manufacturer's instruction, following the procedure below:
- Verify the position of the re-injectable hoses according to the
technical drawings;
- Check the maximum length of the re-injectable hoses according to
the technical data sheet instruction;
- Apply the re-injectable hoses using fixing point applied at a
maximum distance of 15 cm. Fixing point shall be PVC-H tie or other
type of fixing approved by the manufacturer.
- Re-injectable hoses shall be completely embedded in the final
lining and connected with the surface of the concrete lining using
colored (white and red) termination hoses collected in the End Box.
Termination hoses and re-injectable hoses shall be connected using
the related plastic connector, covering the junction using the hot
shrinkage sleeve.
- Overlap between two subsequent re-injectable hoses shall be 20 cm
at least;
- Each termination hoses shall be sealed using plug to avoid the
clogging of the hoses in the following construction phases;
- Each termination hoses shall be marked and its position recorded in
order to address the re-injectable hoses and its position even
after the pour of the final lining.
6) Installation of the Protection Layer
Protection layer shall be installed as a protection additional
layer.
The material shall be fully welded on the waterstop edge and spot
weld to the waterproofing membrane where necessary to keep the
material in position.
In presence of watertight anchors, to avoid stress on PVC
waterproofing membrane, the spot weld shall be placed on
waterproofing membrane welded on anchoring plate.
The number of spot welds shall be enough to allow to hold up the
protection layer.
Adjacent sheets of protection layer shall be joined by a full
continuous welding and the overlap shall be enough to allow
correctly the welding procedure.
※ Storage and Transport
1. Different types or specifications of products should be
separated, not mixed.
2. Keep it dry and ventilated, protected from the sun or rain.
3. Pile up the membranes flatwise whose stockpile height should not
exceed five layers.
4. Prevent tilt or side pressure during transportation, and cover
with felt if necessary.
5. Storage time is at least one year from manufacture date if the
product is under normal storage condition.
※ Brand Stature
Joaboa Tech is the main editor of China National Standard for PVC
Waterproofing Membrane, GB12952-2011, who has enjoyed great
reputation in Chinese domestic market for over 20 years, whose PVC
membrane has been widely used in Chile, Peru, Thailand, etc.
Except for PVC Waterproofing Sheet, Joaboa Tech can also produce
the PVC Geomembrane Composite with 500g/㎡ PP Geotextile, of the superb quality that can be used for projects
that have highest requirements for waterproofing, like, dam,
tailing dams, etc. The quality has been tested and proved by BV lab
already.
※ International Cerfificate
Joaboa Tech Bondsure® PVC Waterproofing Membrane has already passed the strictest and highest roofing test- FM
Approvals long time ago.
Being as the Pioneer of High Quality Waterproof System in China,
Joaboa Tech is producing the best quality PVC Waterproofing
Membrane that can compete with international brands in the global
market.
That's why Joaboa Tech's PVC can be used in Thailand and Peru
Government Projects.
※ Document Download
Joaboa Tech Bondsure PVC Waterproofing Proposal for Tunnels
