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Issue No 03
Issue Date July 09
Concrete Step Barrier Design Guidance
CSB: Lighting Columns (3) - Installation
Associated Data Sheets DS/CSB/510 DS/CSB/511
APPLICATIONS
•Signs and gantries
•Lighting columns
Design Guidance Notes
Installation
The recommended method of installation of lighting
column anchorages is by post drilling as this ensures
continuity of the slipforming process. All anchorages must
be fixed at the correct centres to suit the flange plate design
and must be parallel to the axis of the column. The drilling
system proposed by the installer must demonstrate a
proven capability to achieve this requirement. It is important
to ensure that the drill is vertically plumb.
Drilling into WCSB (Figure 1a and 1b) must use a diamond
core system for any drill hole ≥20 mm diameter x 50
mm depth to avoid damage to the concrete from rotary
percussion methods.
Figure 1b
Drilling should only take place whenthe concrtete has
reached a compressive strength of 25 N/mm2. The
illustrations show the SSR-128-Karat-164 diamond core
drilling system by Fixing Centre Ltd.
Drilling for flange plate anchors
Figure 1a
Removing concrete core
Drilling for flange plate anchors
1
BS 5080 - 1 Structural fixings in concrete and masonry. Method
of test for tensile loading.
CONCRETE STEP BARRIER Design Guidance
Prepared for Britpave by Arup
DS/CSB/512 CSB: Lighting Columns (3) - Installation
CSB: Lighting Columns (3) - Installation
DRAWINGS CSB/1005 CSB/1006 CSB/1007
DS/CSB/512
THE KNOWLEDGE
DS/CSB/512
CSB: Lighting Columns (3) - Installation
THE KNOWLEDGE
Issue No 03
Issue Date July 09
Weep holes
Figure 2
Where weep holes are required (Figure 3), they should
be located at the bottom of the cable trough. Weep holes
should have a gradual downward slope from the base of the
trough to the outer face of the barrier to facilitate drainage.
Accuracy of drilling is essential and only diamond coring
systems should be used to avoid damage to the barrier
concrete. Weephole location should not coincide with
lighting column locations. Weepholes are typically 30 mm
diameter. However dimensions should be determined by
the designer on a project specific basis.
Figure 3
Cable trough
Weep hole
Finished
Road Level
TWCSB with weep hole
Finished installation
Britpave Riverside House, 4 Meadows Business Park, Station Approach, Blackwater, Camberley, Surrey GU17 9AB
Website www.britpave.org.uk
Facsimile 01276 33160
E-mail [email protected]
Standard anchor centres for flange plates are as Table 1
below:
Column
height
Figure 4
Anchor centres
WCSB
TWCSB
(with trough)
12 m
300 mm x 300 mm
400 mm x 400 mm
15 m
300 mm x 300 mm
400 mm x 400 mm
Table 1: Anchor centres for standard flange plates
Note: 300 mm x 300 mm is the standard detail
A typical installation rate is eight to twelve anchorage sets
per shift, for a two-man team working with a drilling rig.
Installing weep holes
Testing
Tensile axial load site tests are required to demonstrate
that the anchors have been installed correctly. The project
engineer should nominate which anchors are to be tested.
Testing should not take place until the concrete reaches
its 28 day strength (i.e. 35 N/mm2). The test load should
be set at the nominal load in the anchor at the collapse of
the column increased by 10% (serviceability limit state).
Testing should conform to BS 5080-11 using incremental
loading as clause 7.13.
CONCRETE STEP BARRIER Design Guidance
Prepared for Britpave by Arup
DS/CSB/512 CSB: Lighting Columns (3) - Installation