The Barge Dock - Structural Assessment (Kingston upon Thames)

Project Overview

GEM Enterprise carried out a detailed structural assessment of The Barge Dock in Kingston upon Thames (originally part of Kingston Power Station) to evaluate current condition and specify make-safe and repair works. The dock had not benefitted from recent inspections or significant maintenance. Our scope focused on structural safety, arresting deterioration, and setting a practical pathway to bring the dock back into reliable use and manageable maintenance.

Structure: Historic barge dock (mass concrete and reinforced concrete with timber fendering)
Primary defects: Severely decayed fender timbers; spalled concrete exposing reinforcement; widespread biological growth (moss/algae/mould) indicating retained moisture
Deliverables: Annotated defect drawings; prioritised repair schedule; outline details for timber replacement and concrete repairs; cleaning methodology; maintenance regime

Severe decay of fendering timbers

Finding: Fender strips and sacrificial timbers heavily degraded.
Risk: Loss of impact protection for craft and the dock edge; local damage to parent concrete during berthing.

Concrete damage with exposed reinforcement

Finding: Areas of spalling and delamination exposing steel.
Risk: Ongoing corrosion and section loss; reduced durability and potential for localised failure if left untreated.

Biological growth and moisture retention

Finding: Moss, algae and mould across shaded/constantly damp surfaces.
Risk: Accelerated deterioration, slippery walking surfaces, and impeded drainage.

1) Timber fendering replacement (immediate priority)

Replace decayed members with marine-grade fendering (e.g., sustainably sourced greenheart/oak, or recycled composite fenders where appropriate).
Stainless/galvanised fixings; isolation washers to reduce bimetallic risk at steel interfaces; sacrificial rub-boards where frequent contact is expected.
Allow for replaceable wear pieces to simplify future maintenance.

2) Concrete repairs to arrest corrosion

Break out defective concrete to sound substrate; clean and passivate exposed reinforcement; reinstate with a BS EN 1504 compliant repair system (primer, repair mortar, bonding/curing as specified).
For edges/arrises, use fibre-reinforced repair mortars and formwork to restore geometry; re-coat with a protective anti-carbonation finish in splash zones.
Where section loss is significant, introduce local stainless anchors/dowels to secure repairs to the parent structure (to BS 8539 principles).

3) Cleaning & biological control

Pressure-wash surfaces within agreed pressure limits to avoid substrate damage; apply biocide suitable for aquatic environments.
Reinstate/clear drainage paths; consider slip-resistant finishes on access steps/walkways.

4) Method, access and environmental controls

Prepare a method statement covering floating plant access or pontoon work, exclusion zones, debris containment and waste handling.
Liaise with the local navigation authority (non-tidal Thames) regarding access windows/closures; schedule works to avoid fish-spawning periods and comply with pollution prevention measures (silt curtains, spill kits).
Apply permit-to-work controls for over-water operations; ensure rescue provision and life-saving equipment are in place.

Safety improved: reinstated impact protection and removal of immediate hazards.
Durability restored: concrete repairs and protective finishes arrest corrosion and extend service life.
Manageable upkeep: a planned maintenance regime (inspection/cleaning intervals; fender wear-piece replacement) reduces future cost and risk.

Condition survey & defect mapping · Fendering replacement design · Concrete repair specification · Cleaning/biocide methodology · Over-water method & environmental inputs · Maintenance plan & inspection schedule

Expertise in Complex Structural Challenges

Advanced Engineering Solutions: Skilled in addressing intricate structural issues through innovative engineering practices.
Innovative Approaches: Utilises cutting-edge technology and methodologies.

Customised Solutions

Tailored Designs: Solutions crafted to meet the specific needs of each project and client.
Client Collaboration: Works closely with clients to understand their requirements and achieve desired outcomes.

Commitment to Quality

Stringent Quality Control: Maintains high standards throughout project execution, from design to commissioning.
Safety Focused: Prioritises safety in all aspects of design and implementation, adhering to the highest industry standards.

GEM Enterprise specialises in comprehensive structural and civil engineering services. Our experienced team is dedicated to delivering innovative, safe, and efficient solutions for complex engineering challenges. With a commitment to excellence and client satisfaction, we provide services ranging from structural assessments to the design and implementation of bespoke engineering solutions.