Project
title:
Construction of boardwalk
Year/s when the
project is active:
2007/8
Event/s within a
year:
1 event-October-March
Zones or
compartments:
10
Expenditure:
£38,000 staff time: reserve manager 6
days
Assistant reserve manager 8 days
Project
priority:
1
Justification for
the project (i.e. the intended outcome):
The Countryside Council for Wales is in the
process of improving public access at Cors Caron National Nature
Reserve (NNR). As part of this programme of works it is necessary
to construct a boardwalk which will provide access for the visiting
public. The boardwalk will be suitable for wheelchairs and
compliant with the Disabled Discrimination Act.
Potential impact
on other features:
None
General
background/bibliography:
See management plan.
Project
methodology:
The work will be carried out by a
contractor.
Specification of
works:
Section 1
Remove from site and dispose of approximately 65 m
of existing boardwalk.
Section 2
Construct 875 m of new
boardwalk.
Section 3
Design and construct a ramp to allow wheelchair
access from the old railway line to the boardwalk at point X on
enclosed map.
Boardwalk
design
The boardwalk is to be 1.2 m wide between the kick
boards. The kickboards should
be 75 mm high. The boardwalk must have a maximum
gradient of 1:12. The maximum distance between passing places
should be 150m. There should be no slope across the
boardwalk.
The decking boards are to be transverse across the
boardwalk and spaced a
maximum of 10mm apart. The decking boards are to
be supported by two 100x 100mm stringers on the outside edges and a
100x50mm stringer down the centre. The decking is to be secured by
two galvanised nails at each support point. The stringers are to be
supported and fixed to two 100 x 50mm crossbeams fixed
to
lOOx 100 mm posts by 16mm galvanised coach bolts.
These supports should be
at least every 3 m. Each support post is to be dug
or driven into the ground to a depth of 1,500mm where the boardwalk
is raised less than 200mm above ground. Where the boardwalk is
raised to a greater height than this the support posts should be
dug or driven 2,000mm into the ground. The timber sections should
be as follows:
Decking boards 150x40x 1,300mm
Crossbeams 100 x 50 x 1,500 mm
Stringers lOOx 100mm x variable
length
Support post lOOx 100mm x variable
length
Kick board 50x 75 mm x variable
length
The tenderer should provide prices for
constructing the boardwalk in
(a) Untreated sweet chestnut
(b) Pressure treated Douglas Fir
Both to be free of large knots and other
defects.
Non-slip surfacing - Tenax Geogrid Type LBO 220 to
be stapled to the boardwalk decking. CCW can provide details of one
supplier of this material.
Storage and on
site movement of materials
It is important to minimise the use of vehicles on
site and avoid compacting or churning the surface. CCW will provide
support to the contractor for transporting materials on site with a
tracked ATV. Due to the presence of rare and sensitive species the
locations for the temporary storage of new and redundant materials
must be agreed with the CCW Warden.
Other
requirements
The site is open to the public whist work is in
progress. The contractor will be responsible for the provision of
signs and barrier tape to warn the public and deter entry to work
areas. The contractor must take all reasonable steps to ensure that
materials stored on site are safe.
Note: The conditions of contract follow a similar
pattern to those in the previous example.
