MARINE & COASTAL SYDNEY HARBOUR PROJECT

Marine Wharf Epoxy Crack Injection Repairs

Sydney Harbour, NSW

An extensive epoxy crack-injection scope beneath a concrete wharf, with repairs across beam tops, vertical faces and overhead soffits, supported by scaffold access above harbour water.

EXPLORE THE REPAIR AREAS
Epoxy injection stage with surface-seal paste and injection equipment installed along the wharf beam beside the scaffold walkway.
DURING REPAIRSBeam-top injection & scaffold access
PROJECT VALUE
$1.4 Million
REPAIR SCOPE
Wharf beams, faces & soffits
PROPERTY TYPE
Marine Wharf & Ferry-Terminal Infrastructure
ACCESS & DELIVERY
Staged scaffold access above water

PROJECT 47 · MARINE CRACK REPAIRS

Project Overview

This $1.4 million marine repair project brought multiple crack-repair areas beneath a large concrete wharf into one staged works package. The project photographs follow the work from exposed crack lines through surface sealing and epoxy injection across beam tops, vertical faces and overhead soffits. Scaffold access above harbour water allowed the repair team to move through connected work zones while maintaining controlled resin placement and inspection.

THE PROBLEM

Connected cracks extend along concrete beam tops, around changes in direction and across overhead soffits. Each repair area needs close inspection to establish the crack condition and suitable treatment.

THE REPAIR

Assess and prepare the nominated cracks, seal the exposed crack lines and install surface-mounted injection points before introducing a suitable epoxy resin under controlled pressure.

OUTCOME

The staged injection works filled and bonded the nominated stable cracks across the treated concrete sections, with curing checks, repair records and verification completed before each work area was released.

SITE CONDITIONS

Over-water scaffold access, restricted headroom, night working conditions and nearby ferry activity shape the access plan, containment arrangements and sequence through the wharf bays.

The photographs document the project during preparation and epoxy injection works across multiple repair zones beneath the wharf.

CONNECTED REPAIR AREAS

Scope of Works

Beam Tops & Returns

Follow the crack runs along accessible horizontal concrete, including corner returns and the areas surrounding support junctions.

Vertical Beam Faces

Prepare and treat nominated cracks along the beam faces, with injection points positioned for the selected repair system.

Overhead Soffits

Access cracks across slab undersides and beam soffits, allowing for overhead preparation, resin control and inspection.

Marine Access & Containment

Plan scaffold work areas, lighting, material handling and containment around the wharf geometry and water below.

CRACK PREPARATION & INJECTION

Before & During Repairs

Compare the exposed crack line with the surface-sealed injection setup. The right-hand view shows equipment installed during repairs, before removal of the injection points and final finishing.

Epoxy injection stage with surface-seal paste and injection equipment installed along the wharf beam beside the scaffold walkway.
Before repair view of a long crack along a concrete wharf beam beside a scaffold walkway above dark harbour water.
BEFORE DURING REPAIRS

Drag the divider, or use the arrow keys when the handle is selected.

View before image in a new tabView injection stage in a new tab

TYPICAL REPAIR SEQUENCE

Controlled Epoxy Injection

The sequence is set by the assessed crack condition, the chosen resin system and the constraints of each marine work area.

  1. Inspect & Map the Cracks

    Record the crack runs, accessible faces and visible condition. Assess movement and moisture before confirming which cracks are suitable for epoxy injection.

  2. Establish Access & Protection

    Set out the scaffold work zones, lighting and access routes. Plan containment and material handling for preparation and injection above the water.

  3. Prepare the Concrete

    Clean the nominated repair surfaces and crack interfaces. Confirm that the substrate and moisture conditions meet the selected repair system requirements.

  4. Seal & Install Injection Points

    Bond the surface-mounted injection points and seal the crack line between them, following the specified layout and allowing the surface seal to cure.

  5. Inject & Monitor the Resin

    Introduce suitable epoxy resin under controlled pressure. Monitor resin take, adjacent injection points and any leakage, recording progress through each repair zone.

  6. Cure, Finish & Verify

    Allow the specified curing period, complete the required checks and record the treated areas. Remove temporary injection equipment and make good surfaces where specified.

BENEATH THE WHARF

Marine Access & Staging

The images show a continuous scaffold route through the wharf structure, with work platforms alongside beam faces and beneath overhead repair areas. A site-specific access plan would coordinate working levels, headroom, lighting and the harbour below.

  • Work platforms positioned for horizontal, vertical and overhead repairs.
  • Contained handling of preparation debris, surface-seal material and resin.
  • Repair stages coordinated with water conditions and adjacent wharf activity.

BEAM TOPS · FACES · OVERHEAD SOFFITS

Explore the repair areas beneath the wharf.
Open any image to see the full detail.

Surface-sealed crack and epoxy injection equipment along a wharf beam, with a scaffold walkway and ferry visible beyond the piles.
Long beam-top injection run
Injection equipment follows a sealed crack around an L-shaped concrete beam return between two scaffold access routes.
Crack treatment around a corner return
Branching sealed cracks and injection equipment on a concrete beam beside a supporting wharf pile and guarded scaffold platform.
Repair area beside a wharf support
Epoxy injection equipment along a beam top beside a concrete wall, with a lit scaffold walkway extending through the wharf.
Beam-top repairs through a narrow passage
Injection equipment suspended from surface-sealed cracks beneath intersecting concrete beams above a wharf support and scaffold work area.
Overhead beam and support junction
Horizontal injection equipment attached along a sealed crack on a vertical wharf beam face beside an illuminated scaffold walkway.
Injection points along a vertical beam face
An overhead line of injection equipment follows a surface-sealed crack across the concrete slab soffit above a guarded marine work platform.
Crack injection across the slab soffit
Injection equipment follows a crack across an adjoining overhead concrete bay, with scaffold platforms, harbour piles and a ferry in the background.
Adjoining overhead repair bay
Before view showing an unsealed crack running along the concrete beam top beside the scaffold walkway under the wharf at night.
Before: exposed crack along the beam top

CRACKS IN A MARINE CONCRETE STRUCTURE?

Arrange an Inspection

Tell us about the affected concrete, visible cracking and available access so we can discuss an inspection and the appropriate next steps.

EXPLORE CONCRETE CRACK REPAIRS
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