INSTALLATION GUIDE
Main Carriageway
Main Carriageway
Concrete/reinforcement to suit anticipated trafficking 12.5mm galvanised steel plate
Concrete/reinforcement to suit anticipated trafficking 12.5mm galvanised steel plate
INSTALLATION DESIGN-OUTLETS Class 1 mortar ST4 Concrete Main Carriageway Crossing Base Units and Cover Plates Class 1 mortar ST4 Concrete Main Carriageway Crossing Base Units and Cover Plates
125min
125min
Select outfall pipe diameter/gradient Care should be taken to ensure sufficient capacity. Highway (see Fig 16) Standard outlet formed using two base outlet units (in place of standard base units) to give full width rectangular outlet 400x275mm (shallow, crossing and deep base outlet units available). Positioning is not critical, but should allow access for suction pipe from gully emptier. Discharge capacity may be increased by installing more than one pair of Base Outlet units discharging into the same outfall chamber. Grid Silt Box Top Grid Silt Box Top
Clearway/Safeticurb ® (see Fig 17) Select outfall chamber, pipe dimension and pipe gradient to suit system capacity. Position a silt box top on two courses of engineering brickwork over the selected outfall chamber/silt trap to give access (via the silt box lid) for silt removal. Mini Highway sump unit (see Fig 18) With hinged, removable lid for inspection access, is placed over inflow unit in place of standard top units. Slot
GENERAL PRINCIPLES Details of outlet units and inspection access differ according to which linear drainage system is used. In any system, silt or detritus should normally be prevented from entering the main drainage sewer. An outfall chamber is required to enable silt collection before onward connection to a sewer. Types of outfall chamber Trapped precast concrete, clay or plastic gully pots. Gully pot capacity may be insufficient for some larger linear drainage installations Purpose-built brick or concrete inspection chamber Precast concrete manhole rings Dedicated sump unit Side road Side road
Standard Top and Base Unit
Standard Top and Base Unit
adius Kerb Kerb
Slot
o
plate
For larger schemes, chambers to be detailed in accordance with The Slot Slot
Specification for Highway works, clauses 507 and 508. For larger outfall pipes it may be necessary to incorporate a manhole access at rear of run.
125x150 BN kerb & surround
125x150 BN kerb & surround
Class 1 mortar Thickness varies to suit crossing kerb
Class 1 mortar Thickness varies to suit crossing kerb
X
X
X
X
ates
X
X
X
X
ST4 concrete bed & haunch
T4 concrete bed & haunch
Silt Box Top
Fig 15a. Clearway/Safeticurb ® junction bends
5mm
Channel Grating Surfacing
5mm
Channel Grating Surfacing
Grid
Slot
Concrete grade ST1 Epoxy or Class 1 mortar
Concrete grade ST1 Epoxy or Class 1 mortar
uPVC Pipe Fitting
uPVC Pipe Fitting
25mm Granolithic Concrete benching
25mm Granolithic Concrete benching
Standard Highway Base Unit
Standard Highway Base Unit
Slot
ST4 Concrete Base
ST4 Concrete Base
n)
460
460
Fig 14. Clearway/Safeticurb ® outlet/junction
Fig 15b. x-x section (from Fig 15a.)
149
X
X
TECHNICAL INFORMATION: charcon.technical@aggregate.com
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