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F

ollowing hard on the heels of its 2014 success

on the Medmerry managed realignment project

on the Sussex coast, construction consortium

Team Van Oord has completed another coastal protec-

tion scheme – once again with the help of Kijlstra precast

units.

The £30m Broomhill Sands coastal defence project

(near Rye, at the other end of the county fromMedmerry)

involves construction of a concrete wave wall and rock

revetment along a 2.4 km stretch of coast. The scheme

is designed to improve the standard of protection from

1 in 5 to 1 in 200 years – including an allowance for cli-

mate change and changes in predicted tide levels.

The works include: a 1.8 km length of rock revetment

requiring 265,000 tonne of rock armour and a new con-

crete wave wall; recharging 700m of shingle beach and

replacing the existing timber groynes; and widening and

improving the existing access way along the top of the

sea defences, including pedestrian access steps and

ramps down to the beach.

The contractor carrying out the work is Mackley, a

member of the Team Van Oord consortium.

Technically quite different from

Medmerry, this scheme neverthe-

less makes extensive use of

Kijlstra’s precast panels as well as

its CSO chambers and ancillary

products.

The panels are a key compo-

nent in the design of the concrete

wave wall, explains Kijlstra’s project

co-ordinator, Hendrik Jonker:

“We have supplied precast

concrete upstands to form the

vertical part of the wall.”

Approximately 570 panels, each measuring 3 m long,

1.2 m high and tapering from 300 mm to 250 mm in

thickness from the base to the top, were installed on an

insitu cast base prepared by Mackley.

“Originally, the contractor wanted a completely

precast solution but although we quoted for a

full off-site design there was no real advantage

and we actually advised an insitu base,”

says Hendrik.

Though wave walls are traditionally insitu structures

requiring costly and time-consuming formwork and steel

placement, using factory-made precast units meant the

wall was built in the shortest possible time – a major

advantage on an exposed coastal site.

Tony Barnes, Mackley’s project manager explains:

“Speed of installation has got to be key – it was

the main reason for going precast. We made

rapid progress and installed an average of eight

units per day throughout the project.”

The panels were all bespoke units, manufactured to

specification at Kijlstra’s factory in Henlade, Somerset.

Precast Speeds Up

Delivery On Award

Winning Sea Defence

Contractors World UK & Ireland Vol 6 No 1

28

Contractors World UK & Ireland