Technology
How it is built
How the platform is engineered. This page looks beyond the overview at how a Hydrantula structure is built, the engineering principles behind it, and the materials it uses. Each element is selected and qualified to recognised international and Singapore standards, so the technology can be assessed on its engineering merits
01. Assemble onshore
The pipe-and-fitting frame is assembled onshore from standardised fittings, in a controlled environment rather than over open water. Working on land allows precise tolerances, inspection and quality control before anything is placed, and removes the weather and access constraints that limit conventional marine construction. This frame becomes the permanent formwork for the structure
03. Position
Before the concrete is cast the module is light, which keeps logistics simple and widens the windows available for placement. It is transported and set onto its prepared foundation at the site. Only positioning and casting take place over the water, which keeps marine operations short
02. Reinforce
GFRP reinforcement and pull rods are fitted within the frame to carry tensile and cyclic wave actions. Because the reinforcement is glass-fibre-reinforced polymer rather than steel, it does not corrode in seawater, and the cover is governed by bond and fire rather than by corrosion protection. The layout is set by the structural design for each element
04. Cast
The concrete core is cast in place by bottom-up displacement, filling the formwork from below to limit segregation, washout and voids. The HDPE shell confines the fresh concrete and remains as a permanent barrier once cured. The result is a monolithic, corrosion-free structural core
Engineering principles
A statically indeterminate space frame distributes actions through multiple load paths and resists progressive collapse
Redundant load paths
The structure behaves as a statically indeterminate space frame, so actions are shared across many members and multiple load paths rather than a single critical line. This redundancy gives high torsional stiffness and resistance to progressive collapse, because load redistributes if any one member is overloaded. It is a deliberate contrast to mass structures that rely on bulk alone
Wide-footprint foundation
A broad base spreads the structure's load over a larger area, reducing bearing pressure and suiting soft marine sediments. The footprint is configured to the seabed conditions of each site. This often reduces or avoids the deep piling that comparable structures require
Reduced hydrodynamic loading
The porous lattice lets water pass through rather than presenting a solid face to waves and currents, which lowers wave reflection and the effective hydrodynamic load the structure carries. Lower reflection also reduces scour at the toe. The degree of attenuation depends on geometry and is established per project through CFD and physical-model testing
Confined concrete core
The permanent HDPE shell confines the concrete core, which supports its compressive strength and ductility and keeps it sealed from the marine environment. Confinement helps the section behave in a controlled way under load. Shell and core act together as a composite element
Materials & Durability
Durability is engineered at the material level and demonstrated against recognised standards, not asserted. The structural core is corrosion-free by design, and each material system is selected and qualified for the marine environment. Design life is addressed on a project basis; the points below are how that durability is achieved and verified
HDPE Formwork (PE100)
The permanent shell uses PE100 pipes (DN200 to DN400) that are chemically inert in seawater and form a barrier against chloride ingress, abrasion and biological attack. Published durability data for HDPE pipe gives service lives from 50 years to more than 100 years depending on stress and temperature, with the Florida DOT protocol establishing 100 years for virgin material; the life-limiting mechanisms are slow crack growth under sustained tension and oxidation. In this application those drivers are favourable, because the shell is shielded from ultraviolet exposure once encased, is loaded mainly in confinement rather than sustained tension, and operates at a moderate tropical temperature.
GFRP reinforcement
The reinforcement is glass-fibre-reinforced polymer with a tensile strength in the order of 600 to 1000 MPa and an elastic modulus of 40 to 55 GPa, supplied to the material specification ASTM D7957 and designed to the GFRP-reinforced-concrete code ACI CODE-440.11-22. Two long-term mechanisms are managed in design: creep-rupture under sustained tension, controlled by limiting the sustained service stress per ACI 440.11-22; and alkaline durability in the concrete pore solution, predicted with Arrhenius-based accelerated-ageing methods (Tu et al., 2019) and supported by the dry, sealed environment inside the HDPE shell. The same approach allows in-service monitoring of stiffness as a durability indicator
Concrete core
The core is a self-compacting concrete of class C35/45 to C40/50, cast by bottom-up displacement and confined by the HDPE shell. Because the reinforcement is GFRP, there is no steel to corrode, which removes the chloride- and carbonation-driven corrosion that governs conventional marine reinforced concrete. As a non-standard solution, it is specified to SS EN 206 with its complementary Singapore Standard SS 544-1:2024 and SS 544-2:2024, and durability is demonstrated through the BCA route for innovative concrete solutions, which compares performance against a conventional concrete by testing such as chloride permeability, carbonation, water penetration and sulphate resistance
Verification
Material performance figures are company estimates, confirmed by project-specific testing, and the design is subject to independent checking. The regulatory framework, including Singapore's Code of Practice on Coastal Protection, is covered on the Standards & compliance page
Patent & IP
Hydrantula is a technology licensor. The modular platform, its proprietary fittings and the engineering methodology are protected by intellectual property rights, and EPC contractors and developers build under licence rather than buying a product. Licensing gives a project the fittings, the design methodology and engineering support, applied to a consistent standard
Technology Licensing
Our platform is licensed for use by EPC contractors and coastal developers. This licensing framework ensures that the proprietary fittings and modular assembly methodology are protected and applied under strict engineering standards.
