Tensar Wall – TW1

Tensar Installation Guide for Contractors
IGC/TW1_10.07.08
Tensar Wall – TW1
1. Prepare the foundation and cast a mass concrete
leveling strip with typical dimensions of 450 mm x
150 mm high (600 mm wide or as required, if an
external architectural face is to be attached)
1.
2. A single course of base units should be bedded
on mortar to the correct line & level
The Tensartech TW1 Standard block has a nominal face
angle of 86.2° (1:15) the TW1 Link block wall has a
nominal face angle of 89.2° (1:75) which should be
taken into consideration when setting the wall out
2.
3. Place and compact approved fill in accordance
with ..................................... up to the top of the
course. Use a vibrating plate compactor or
vibrating roller with a mass per meter width less
than 1300 kg and a total mass less than 1000 kg
within 2 m of the face. Install a minimum 150
mm thickness of Type A drainage material
immediately behind the face
3.
4. Cut the grid from the roll to the required design
length. At one end ensure that a row of ribs is
trimmed to a length of 50 to 60 mm (across the
full width of the roll)
3.
Do not cut them
back to the
transverse bar.
4.
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5. Remove all debris from the top of the units using a
brush
6. Place the prepared end of the grid over the rebate
in the block & locate the moulded connectors
around the transverse bar. Ensure that each
aperture of the geogrid is covered by a connector.
The connectors should be split where necessary
6.
7. Position the assembly neatly into the rebate with
the trimmed ribs towards the face next course
(standard units are now used right up to the coping
course). Repeat this procedure for the whole course
ensuring that adjacent lengths of grid are abutted
at the wall face. They should be placed stretcher
bond & arranged so that the downstand is pushed
up against the front of the rebate in the lower unit
7.
8. (a) Place a minimum of three further courses
ensuring they are pushed fully forward and are
square with the previous course. Every course of
blocks should be checked for horizontal and vertical
alignment and the line and level of the wall overall
checked every 3rd course. Any adjustment necessary
may be made using ribs cut from the geogrid or
approved shims, placed in between blocks.
8a.
(b) Any lengths of grid fitted into the wall face
above the level of fill should be temporarily folded
over the top of the wall to provide a free working
area
8b.
(c) Any undue bending of the geogrid should be
avoided.
8c.
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9. Insert the tensioning beam (see TN_UniaxialBeam) through
the apertures at the free end of the grid & apply a load
sufficient to remove any slack. Whilst maintaining tension,
place a layer to fill on the grid which is sufficient to retain
it in position when the load is released. Release the
tension & remove the beam
11
10. Place and compact fill in 150 mm lifts keeping units a minimum
of three courses above the fill until the top of
the structure. Repeat the procedures as described in steps
4-10 to the required height of the wall
11. Fill always should be placed by plant such as an excavator
bucket or dozer with an opening bucket, which causes the fill
to cascade onto the grids
12. Compaction should always commence nearest the facing
units, working away toward the free end of the grid
13. No traffic or site plant shall be permitted to travel directly on
the grids
14. The top course of block units should be bonded to the course
below using approved adhesive. Extrude a bead of adhesive
either side of the rebate of the lower units & place the top
course, pressing firmly to locate.
15. In order to achieve good line & level, the coping units should
be bedded on mortar. When alignment of the wall is curved
or angled, the coping units require cutting on site to achieve
best fit
16. If an architectural masonry face is to be attached, the
approved stainless steel ties provided should be inserted into
the slots of the TW1 Link units, during the laying process. A
rate of three ties to every square metre of face in a staggered
pattern should be used
12
17. The Contractor must fully assess the safety risk associated
with working at height and where appropriate install any
necessary temporary edge protection
13.
The information in this document is of an illustrative nature and is supplied without charge. It does not form part of any contract or intended contract with the user. Final
determination of the suitability of any information or material for the use contemplated and the manner of use is the sole responsibility of the user and the user must assume all risk
and liability in connection therewith.
Tensar is a registered trade mark
Tensar International Limited
Tel: +44 (0) 1254 262431
Fax: +44 (0) 1254 266867
E-mail: sales@tensar.co.uk
www.tensar-international.com
UK Head Office
Cunningham Court
Shadsworth Business Park
Blackburn
BB1 2QX
United Kingdom
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