The red brick wall, and gates which can be slotted in when needed, will protect the St Bede's and River Park areas.
Warning After Men Pick Up Shells At Army Range
The Ministry of Defence is warning the public to be vigilant after two men were seen carrying tank shells at a Dorset beauty spot.
The pair were photographed with the devices slung over their shoulders by a member of the public.
The shells were found at Worbarrow Bay, part of the 7,000-acre Lulworth Military Range used by the Army for tank firing practice.
The Ministry of Defence urged the public to stick to designated pathways and not to touch any military objects they may find.
"The MoD takes the safety of the public extremely seriously and all pathways at Lulworth Ranges that are open to the public are cleared of military debris, including shells, before access is permitted,'' a spokeswoman said.
"A number of signs have been placed on-site warning members of the public of the dangers of venturing from authorised pathways and removing shells.
"Unfortunately there are instances where these warnings are ignored.
"The MoD urges public using the ranges to keep to the designated pathways and be advised that it is extremely dangerous to touch any military material they may find.''
Later, the Ministry of Defence said the shells had been recovered.
Red Jet 7 will be built at East Cowes, securing 85 jobs there - and will join the fleet next summer.
Five men have been questioned after shots were heard in Wimborne Road.
24-Year-Old Nikki Henderson Become The Youngest Ever Skipper Of A Clipper Round The World Yacht
Recently Played Tracks
Now playing: The best feel good music
Deposit £10 to get a £40 Welcome Bonus - That's £50 to play bingo, slots and more!*
Over 50 tracks to make you feel-good. New album out now...
Find your local four day weather report here.
What's happening on the roads where you are?
Make Heart the soundtrack to your day and you could be a winner with great prizes up for grabs throughout the day.
Find out more about some of the companies advertising on Heart.
Get some great ideas on how to advertise your business on radio, online and on mobile.