Intro
A controlled installation process that converts a segmented pipeline into a continuous restrained system.
HydroFoamer replaces traditional pipeline installation methods based on discrete supports with a continuous, foam-supported system.
Instead of relying on thrust blocks, gravel bedding and mechanical restraints, the pipeline is stabilised along its full length through a controlled application of structural foam.
The result is a simpler, faster and more predictable installation process.
The Installation Sequence
1. Trench Preparation
The trench is excavated using standard civil methods, including GPS excavators.
Unlike conventional installations, there is no requirement for complex gravel grading or preparation for thrust blocks.
The trench geometry is simplified, reducing excavation volume and material handling.
2. Pipe Placement
GRP (or other) pipe sections are placed into the trench.
Segments are aligned and connected using standard couplers.
At this stage, the pipeline is positioned but not yet structurally restrained.
3. Alignment and Verification (PGMS)
The pipe is aligned using measurement systems such as the Pipe Geometry Measurement System (PGMS).
This enables:
- accurate control of pipe orientation
- verification of alignment before and during installation
- creation of a digital QA record
This step replaces much of the uncertainty associated with traditional buried pipeline installation.
4. Foam Application
Structural polyurethane foam is applied around the pipe using a mobile spray system.
The foam:
- expands to fill voids between pipe and soil
- conforms to trench geometry
- creates a continuous support layer
Application is controlled and repeatable, forming the structural basis of the system.
5. Structural Engagement
As the foam cures, it forms a bonded interface between the pipe and surrounding soil.
This:
- transfers axial and radial loads
- distributes forces along the pipeline
- interlocks pipe segments across joints and bends
At this stage, the pipeline transitions from a segmented system to a continuous restrained structure.
6. Backfilling & Completion
The trench is backfilled using native material.
Because the structural function is already provided by the foam, there is no need for imported granular material or large concrete structures.
The installation is completed with reduced material, reduced transport and reduced construction time.
What Changes Compared to Traditional Methods
Traditional Installation
- Discrete thrust blocks at bends
- Heavy use of gravel bedding
- Localised load transfer
- Complex trench engineering
- High material and transport requirements
HydroFoamer Installation
- Continuous structural support
- Minimal or no thrust blocks
- Load distribution along pipe length
- Simplified trench design
- Reduced material and logistics
Structural Principle
HydroFoamer works by creating a continuous interface between pipe, foam and soil.
Loads are transferred through:
- compression in the foam
- shear at the pipe–foam interface
- interaction with surrounding soil
This allows forces to be distributed along the pipeline instead of concentrated at discrete locations.
Why This Matters
This change in behaviour leads to:
- lower construction cost
- faster installation
- improved stability in difficult terrain
- reduced environmental impact
System Characteristics
HydroFoamer is:
- mobile – deployable in remote environments
- controlled – repeatable installation process
- adaptable – compatible with multiple pipe materials
- scalable – suitable for large infrastructure projects