Bongshai Engineering & Construction provides turnkey civil infrastructure development services for government infrastructure projects, industrial zones, and multi-national commercial developments. Operating with state-of-the-art hydraulic rotary drilling rigs, Japanese diesel pile hammers, batching plants, and heavy excavators, our civil engineering team ensures structural stability across complex deltaic soil conditions in Bangladesh.
Large-scale site reclamation, hydraulic riverbed sand filling, dynamic compaction, and subgrade soil stabilization tailored for industrial parks and high-density structural footprints.
Deep rotary drilled bored piles up to 1200mm in diameter reaching depths over 50 meters. Complete bentonite slurry stabilization, tremie pipe concrete pouring, and sonic logging access pipes.
High-strength pre-cast concrete piles (300mm x 300mm to 500mm x 500mm) manufactured under controlled factory conditions and installed using Japanese H35 5-Ton Diesel Hammers.
Engineered rigid RCC pavement design for heavy container yards, factory logistics aprons, asphalt binder courses, and sub-base aggregate compaction meeting RHD specifications.
Industrial water distribution grids, deep storm water retention channels, RCC box culverts, effluent discharge lines, and municipal sanitary sewage collection systems.
Pre-stressed concrete girder bridges, pier caps, abutment walls, flyovers, and heavy traffic access roads engineered for heavy axel load transport.
High-yield industrial water extraction wells drilled to 300+ meters, reverse circulation drilling, stainless steel screen installation, and submersible pump setup for textile & industrial plants.
| Infrastructure Domain | Execution Capacity / Spec | Testing & Quality Standard |
|---|---|---|
| Bored Cast-in-situ Piling | 500mm – 1200mm Dia | Up to 50m Depth | High Strain Dynamic Pile Test (PDA) & PIT |
| Pre-cast Driven Piles | 300mm to 500mm Square Piles (Grade 35-45 MPa) | ASTM D1143 Static Load Test |
| Concrete Mix Quality | C20 to C50 High Strength Ready-Mix | 28-Day Compressive Strength (ASTM C39) |
| Rebar Specification | Grade 60 (420 MPa) & Grade 500W Deformed Bars | Tensile & Bend Testing (BDS ISO 6935-2) |
Executed cast-in-situ bored piling and precast slope retention structures along the 100ft canal section adjoining the 300ft Purbachal Expressway corridor in Dhaka. The scope included complex bentonite slurry rotary drilling, earth embankment slope stabilization, and high-capacity drainage outflow structures.
We strictly adhere to ASTM D1143 for Static Compression Load Testing, ASTM D4945 for High Strain Dynamic Pile Testing (PDA), and Pile Integrity Testing (PIT) using sonic echo analysis to verify concrete integrity and load bearing capacity before structural handover.
In marshy or high water-table soils common in Bangladesh, we utilize heavy-duty bentonite mud slurry suspension to prevent borehole collapse during rotary drilling, along with deep well dewatering systems and steel temporary casing pipes.
