RR Wall & Retaining Wall
Manufacturer & Exporter
We don't just install — we design, fabricate the moulds, cast, cure, and install.Bangladesh's only vertically integrated source for precast hexagonal & octagonal concrete block systems. Available for export.
Live: Blocks Being Placed — Hexagonal Layout
Each cell = one 84″ × 84″ precast hexagonal block
Aerial drone view — large-scale RR Wall project with crane & excavator
Completed retaining wall — urban expressway overpass protection
Completed Project
RHD National Highway Retaining Wall
Precast hexagonal block facing — Bangladesh Roads & Highways Department
What is an RR Wall (Revetment Wall)?
An RR Wall (short for Revetment/Riprap Wall) is a slope protection system constructed using interlocking precast concrete blocks laid on riverbanks, embankments, and slopes to prevent erosion from water currents, wave action, and rainfall.
In Bangladesh — a delta nation crisscrossed by over 700 rivers — RR Wall construction is one of the most critical civil engineering interventions. The Bangladesh Water Development Board (BWDB), Local Government Engineering Department (LGED), Roads & Highways Department (RHD), and Bangladesh Inland Water Transport Authority (BIWTA) all mandate RR Wall or revetment systems in their riverbank and embankment protection schemes.
Unlike rubble riprap (loose stone), precast hexagonal concrete blocks interlock geometrically — providing superior resistance to hydraulic uplift and lateral water forces while allowing vegetation growth through the open joints. This makes them the preferred choice for permanent bank protection across Bangladesh's high-energy river systems.
Next Gen Construction is the only company in Bangladesh that controls the entire chain — from designing and fabricating the steel casting moulds, to pouring, curing, quality testing, and final installation on-site. This means faster delivery, lower cost, consistent quality, and full accountability from a single partner.
How We Do It
6-Step Manufacturing Process
Every block that leaves our casting yard has passed through a rigorous six-stage quality-controlled production process — no shortcuts.
Steel Mould Design & Fabrication
Our in-house steel workshop designs and fabricates precision hexagonal and octagonal casting moulds. Each mould is engineered to produce blocks of exact specification — tolerances within ±2mm. Custom sizes on request.
Reinforcement Placement
High-tensile steel rebar cages (as per BS EN 1992 / BNBC) are placed inside each mould. The reinforcement pattern is designed per structural load requirements and client specifications.
Concrete Batching & Pouring
Grade M25 to M40 concrete is machine-batched with water-cement ratio control. Poured into moulds with continuous mixing and immediate placement to prevent segregation.
Compaction & Surface Finishing
Mechanical vibration compaction ensures zero-void concrete with maximum density. Surface is trowel-finished for dimensional accuracy and interlocking block fit.
28-Day Controlled Water Curing
All blocks undergo a minimum 28-day water curing cycle under controlled conditions. Curing ensures the concrete reaches its design strength of 25–40 N/mm² before dispatch.
Quality Testing & Certification
Every batch undergoes compressive strength cube tests per BSTI and BS EN 12504. Only blocks that pass the minimum crush strength threshold are cleared for delivery and installation.
From Steel to Concrete
In-House Mould Fabrication & Block Casting
Octagonal steel mould — interior view
Hexagonal mould — close detail
Mould on brick curing stand
Row of moulds set up on site
Workers applying release oil
Crane offloading steel moulds
Transport truck loaded with moulds
Rebar reinforcement pattern at night
Workers demoulding completed precast hexagonal block
Finished hexagonal concrete block — ready for installation
Standard Block Specifications
Custom Specifications Available
We fabricate custom steel moulds for any hexagonal, octagonal, or irregular precast block dimension your project demands. Submit your drawings — we will quote within 48 hours.
Where It's Used
Applications & Sectors
BWDB Riverbank Protection
BWDB-approved hexagonal block revetment for major river systems — Padma, Meghna, Jamuna, Teesta and their tributaries.
RHD Highway Embankment
Roads & Highways Department retaining and slope protection walls alongside national highways and bridges.
LGED Rural Embankment
Local Government Engineering Department rural road embankment facing and canal slope protection schemes.
Port & Harbor Revetment
Revetment walls for Chittagong, Mongla, and Payra port authority's quay and channel protection works.
Flood Barrier Facing
BWDB / FFWC flood protection embankment block facing systems across coastal and river-delta zones.
Export to Overseas
Supply of precast blocks to construction projects in Myanmar, India (NE states), Middle East, and East Africa.
Supplying Bangladesh.
Reaching the World.
Our manufacturing capacity allows us to supply large volumes of precast hexagonal RR Wall blocks to international projects. We provide full quality documentation, mill test certificates, and cube test reports for every shipment. Blocks are packaged and loaded to your freight specification.
Why Choose Next Gen Construction?
In-House Mould Fabrication
We own the entire manufacturing chain. Custom steel moulds designed and fabricated by our team — no outsourcing.
Certified Quality
Every batch cube-tested per BSTI / BS EN 12504. BWDB, LGED, and RHD approved supplier.
Custom Specifications
Any size, any shape. Hexagonal, octagonal, rectangular — we fabricate the mould and cast to your spec.
Export Capability
Fully equipped to supply precast blocks internationally with proper quality documentation and freight packaging.
Frequently Asked Questions
QWhat is an RR Wall and why is it used in Bangladesh?
RR Wall (Revetment/Riprap Wall) is a slope protection system using interlocking precast concrete blocks. It prevents riverbank erosion — a critical problem across Bangladesh's 700+ rivers. BWDB, LGED and RHD mandated systems across the country use our hexagonal block design.
QWhat is the cost of RR Wall construction per running foot in Bangladesh?
The cost depends on block size, concrete grade, depth of protection, and site accessibility. Contact our engineering team for a project-specific quote. We offer competitive rates as the direct manufacturer — no middlemen.
QDo you supply precast hexagonal blocks in custom sizes?
Yes. Our in-house steel workshop fabricates custom moulds for any hexagonal, octagonal, or irregular precast block dimension. Minimum order quantities apply for custom sizes.
QCan you export precast RR Wall blocks internationally?
Yes. We are fully equipped to export precast hexagonal blocks with proper quality documentation (mill test certificates, cube test reports, packaging per sea/road freight requirements). We currently serve export inquiries for Myanmar, India, Middle East and East Africa.
QWhat concrete grade do you use for precast hexagonal blocks?
We use M25 to M40 grade concrete (25–40 N/mm² characteristic compressive strength) depending on structural requirements. All batches are machine-mixed and cube-tested per BSTI / BS EN 206.
QWhat is the difference between RR Wall and Retaining Wall?
An RR (Revetment/Riprap) Wall protects slopes from erosion by water — placed on sloped riverbanks or embankments. A retaining wall resists horizontal earth pressure behind a vertical face. We construct both types using our in-house precast block systems.
Ready to Start Your RR Wall Project?
Talk to our engineers. Get a project-specific quote within 24 hours. Supply, installation, or export — we handle it all.