The Kerblay kerb race
The Kerblay technique of extruding a kerb race mechanically, with an upstand at the front to retain the road formation and a 'key' slot at the rear to retain the backing, is the most suitable shape, and it overcomes the expensive formwork otherwise required for this shape.

No job too large or small
Kerblay (UK) Limited carries out works throughout the UK. No job is too small or large, rates are standard fixed for one year. We believe that we are seven times faster and 30% cheaper than conventional kerb race or replacement costs for pre-cast kerbs.

Accuracy and speed
Kerblay (UK) Limited extrude their kerb race to B.S.I. standards with an output of 320 linear m per day. Radii can be extruded as small as 5.0m at no extra cost

There are wider moulds for sites where kerbs and channel blocks are required.

SETTING OUT AND PREPARATION FOR KERBLAY

PINS
Kerblay require 16 mm dia., 800 mm long pins, pointed one end and plain cropped on other end, set 675 mm behind face on kerb.

On straight runs, pin at 4 m centres
On 30 m radius, pin at 3 m centres
On 18 m radius, pin at 2 m centres
On 12 m radius, pin at 1.5 m centres
On 6 m radius, pin at 1m centres

Make sure pins are hammered in vertically and at least 400 mm above base material.

TAPE
Wrap a tape round the pin, with the top of the tape coinciding with finished road level at kerb face or channel.

GRADE PREPARATION
Check the required kerb face height and calculate the dimension from finished road level to underside of kerbrace. With a 255 mm kerb and 125 mm kerb face, this will give a dimension of 305 mm. String a line at finished road level and trim sub-base to 300-320 mm below string, use a spirit level and dip at 675 mm towards centre of road (kerb face), making sure the 300-320 mm dimension is maintained. The machine cannot bulldoze its way through high spots but will ride over them and likewise, it will only average out low spots. Width of grading need not exceed 1400 mm from the pins.

FLAGS AND STRINGLINE
Kerblay will slide plastic brackets with flags over the top of the pin to top of tape level and will tension the stringline, which guides the machine.

GULLIES
If the gullies are put in before the kerbrace, they must not be higher than the trimmed sub-base and should be covered. Many contractors prefer to put the gullies in after the kerbrace, in this case, if the proposed position is marked, Kerblay will dig out the kerbrace face to suit.

DRAINS & MANHOLES
Manholes in the roadway should be ramped to allow the truck mixer to pass without damage to differential casings, axles or tyres. Manholes or other obstacles closer than 400 mm to the kerb face will prevent the free passage of the machine. This will result in a break of about 2 m in the kerbrace and the use of a digger to lift the machine over the obstacle.

INTERNAL RADII
Internal radii of 6 m will require a greater offset for the pins, to allow enough clear space to steer the machine. At the commencing and finishing tangent points, hammer in a pin at the normal 675 mm offset. Alongside, hammer in duplicate pins at 1075 mm offset and continue to pin at 1075 mm at 1 m centres.

HAMMER HEADS AND STOP ENDS
To complete hammer heads or put in stop ends, an extra 2 linear metres of grade must be provided past the cut off point to accommodate the front of the machine. No extra material is required for these 'run offs' but the ground must be firm and level. In these cases, the contractor will be asked to provide a digger to lift the machine out of the run offs and position it for the next run.

DIRECTION OF TRAVEL
The machine is equipped with self-steering and levelling sensors on its right hand side and so travels on the right hand side of the road, allowing the truck mixer driver to be close by during discharge operations.