Company

SYDNEY Head Office
4/8 Lilian Fowler Place
Marrickville NSW 2204
(02) 8015 6398

QUEENSLAND Office
23 Aranda Steet
Slacks Creek QLD 4127
(07) 2145 6581

Mon-Fri: 7am-5pm
Sat-Sun: Closed

info@perfectconcretecare.com.au
Accounts: accounts@perfectgroup.au

(02) 8015 6398 info@perfectconcretecare.com.au
All Projects

Pile Trimming on a University Campus Build, Kensington NSW

Row of bored concrete piles trimmed to cut off level with the cut line marked in blue and starter bars standing above

Project Details

Location

Kensington NSW

Client

O'Sullivan Civil Partners

Duration

In progress, started July 2026

The job

O'Sullivan Civil Partners is carrying out the civil and ground works on a building project on a university campus in Kensington, Sydney. The new structure sits on bored concrete piles. Once the piles are in and the ground is dug out around them, every pile has to be trimmed down to its cut off level, with the starter bars left clean and standing so the pile caps and ground beams can be built on top.

Perfect Concrete Care has been on site since July 2026 with a concrete cutter and a machine operator working in with O'Sullivan's crew. The job is still going, so this page covers the work as at September 2026.

Trimmed concrete piles with starter bars capped in pink along an excavated trench on a campus site
Piles trimmed and the exposed starter bars capped.
Starter bars standing up out of trimmed piles with broken pile head concrete around them
Pile heads broken off above the cut line, starter bars left standing.

What the work involves

  • Marking the cut off level on each pile as it is exposed by the dig
  • Saw cutting around the pile at the cut off line with a hand held petrol saw, so the break stops where it should
  • Breaking the pile head off above the cut with a hydraulic hammer on a mini excavator, then cleaning back to the line
  • Leaving the starter bars clean, straight and undamaged, and capping them once they are exposed
  • Core drilling where needed, with a wet vac on the slurry
  • Working pile by pile and run by run as each area of the dig is opened up, with the blinding and reinforcement following behind
Row of bored concrete piles trimmed to cut off level with the cut line marked in blue and starter bars standing above
A row of piles trimmed to cut off level, the cut line marked on every pile.
Bored piles exposed in the side of an excavation with the cut off level marked in pink paint
Piles exposed by the dig and marked at cut off level before cutting.

What makes it hard

Pile trimming is simple to describe and easy to get wrong. Break too low or too hard and you damage the pile below the cut off level or bend the bars the engineer needs. Every pile has to finish at its level, with sound concrete at the top and clean bars above it.

The site is busy and tight. The piles sit in trenches and pits between other trades, plant and stockpiles, beside occupied campus buildings. Parts of the dig hold groundwater, so some piles are trimmed standing in water and mud. And the work has to keep pace with the excavation, so it runs in short runs rather than one big push.

Mini excavator with a hydraulic hammer breaking pile heads in a wet excavation beside a retaining wall
Breaking pile heads with a hammer on a mini excavator, in a wet part of the dig.
Rows of pile starter bars standing above a fresh concrete blinding layer in a trench
Trimmed piles with their starter bars standing above the blinding.
Excavated pit with several trimmed pile heads and capped starter bars in groundwater
Pile heads trimmed in a pit, bars capped, water in the bottom.

How it is done

Each pile is marked at cut off level once the dig exposes it. The cutter saw cuts around the pile at the line, and then the operator breaks the head off above the cut with a hammer on a mini excavator. The top is cleaned back to level by hand, the starter bars are checked and capped, and the crew moves to the next pile.

The work follows O'Sullivan's excavation run by run. As each trench or pit is dug and its piles trimmed, the blinding and reinforcement go in behind, and our crew moves on to the next area.

Concrete blinding placed around a line of trimmed piles with capped starter bars and a mini excavator beside
Blinding down around a line of trimmed piles, ready for the next trade.
Top of a trimmed concrete pile cut flat with starter bars bent out around the edge
A pile head cut flat at level, with the bars left for the cap.
Exposed pile reinforcement cage beside trimmed piles in front of a concrete retaining wall
A pile cage exposed beside trimmed piles along the retaining wall.
Line of trimmed piles along the edge of an excavation beside an existing campus building
Trimmed piles along the edge of the dig, beside an occupied building.
Concrete blinding pad around pile cages in an excavated trench with barriers behind
Blinding around a group of pile cages.

Lessons learned on this job

Every job teaches the crew something. These are the ones from Kensington so far, and we take them onto every pile trimming job.

What worked

  • Mark every pile before anyone cuts. A clear cut off mark on each pile means the level is set once and checked, not guessed by the person holding the saw
  • Cut first, then break. Saw cutting around the pile at the line means the hammer breaks the head off above the cut instead of cracking the pile below it
  • Look after the bars. Starter bars that come out clean and straight, and get capped straight away, save the steel fixer a lot of work and keep the site safer
  • A cutter and an operator as a pair. One cutting and cleaning, one breaking and moving the heads, keeps each pile moving without either person waiting

What is difficult

  • Water in the dig. Piles in wet pits are slower and messier to trim, so pumping and access need sorting before the crew gets there
  • Working between bars and cages. Space around each pile is tight once the bars are exposed, and it takes care to break the head without bending them
  • Keeping pace with the excavation. The trimming can only go as fast as the dig opens up, so the crew has to fit in around the programme, not the other way round
  • A shared, busy site. Plant, other trades and stockpiles all move around the piles, so the work zone has to be checked and set up every morning

Where the job is at

As at September 2026 the crew has trimmed piles across several runs and pits of the dig, with the blinding and reinforcement following behind, and the work is continuing as the excavation opens up the rest of the site. This page will be updated when our part of the job is finished.

If you have something similar

Civil contractors and builders with piles to trim need them cut to level with the bars left clean, at the pace the dig allows. Have a look at our concrete cutting Sydney, concrete core drilling Sydney and coring through piles pages, or get in touch.

Explore more

Perfect Concrete Care, your trusted concrete solutions partner

Perfect Concrete Care cuts, cores, grinds and scans concrete on commercial and industrial sites. Our technicians run current plant, work to your programme and keep dust, water and noise under control so the rest of the site keeps moving.

We work for builders, civil contractors, facility managers and government across Sydney, Brisbane and South East Queensland. Most of our work is repeat work, which is the only reference that counts in this trade. Send us the drawings or call and we will price it properly.

Contact Us
Talk to a real personCall now

Aboriginal and Torres Strait Islander flagsPerfect Concrete Care acknowledges the Aboriginal and Torres Strait Islander people as Traditional Custodians of the country on which we live and work. We pay our respects to the Traditional Custodians and Elders past, present and future, and honour their connection to the land and ongoing contribution to society.