Thai Binh River Overpass Bridge Construction Project – CKN D1200, D1500

The Thai Binh River overpass bridge project utilizes bored piles with diameters D1200–D1500 and a drilling depth of up to 70 meters, connecting key strategic transportation routes of Hai Duong Province.

In the context of transportation infrastructure development in Vietnam’s Northern Coastal Region, the Thai Binh River overpass plays a strategically important role. The route not only connects the districts of Binh Giang, Thanh Mien, Ninh Giang, Tu Ky, and Thanh Ha, but also links directly to the Hanoi – Hai Phong Expressway and National Highway 37. This significantly expands the transportation network between the southeastern districts of Hai Duong Province and neighboring provinces.

In this article, Hanoi Vietnam provides an in-depth analysis of the technical aspects, practical performance, operational costs, and comparisons with other construction equipment solutions, thereby supporting engineers and project owners in making well-informed decisions.

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Geological Characteristics of the Thai Binh River Overpass Area

The geological conditions at the Thai Binh River overpass construction site represent one of the project’s major challenges. With complex soil profiles consisting of weak layers, clayey silt, and sand mixed with fines, the foundation construction solution requires careful consideration of stability and load-bearing capacity.

Specifically, the stratigraphy includes:

Fill soil and low-plasticity clay mixed with organic matter, in a soft plastic state, easily deformable under load.
Clayey silt and highly plastic silty clay, in a flow plastic state, classified as weak soil with low bearing capacity.
Poorly graded sand mixed with clay and silt, ranging from loose to dense, but mostly in a saturated condition, affecting construction stability.
Some layers with very dense structure, such as poorly graded gravelly sand, providing more favorable conditions for deep drilling.

The average designed depth of the bored piles reaches approximately 70 meters, ensuring penetration through all weak soil layers down to more stable bearing strata, thereby guaranteeing safety and durability for the bridge structure.

Construction Solution for D1200–D1500 Bored Piles in Weak Soil Conditions

Given the complex geology and stringent technical requirements, Hanoi Vietnam Co., Ltd. selected a bored pile construction solution with D1200 and D1500 diameters and an average depth of 70 meters, using flexible-leader drilling equipment. This method adapts well to weak soil layers while maintaining high drilling accuracy.

Main construction stages include:

Drilling boreholes from natural ground level to the full designed pile depth.
Using bentonite or polymer drilling fluid to stabilize borehole walls, depending on geological conditions.
Installing reinforcement cages according to design and placing concrete via tremie pipes, ensuring continuity and preventing segregation.

Reasons for selecting the R10 flexible-leader drilling method:

Highly suitable for weak, soft plastic, and collapse-prone soils.
Excellent control of drilling speed and torque, minimizing borehole wall erosion.
The R10 drilling tool is specifically designed for large-diameter piles, ensuring stable deep drilling.

Main Construction Equipment Deployed on Site – Drilling Rigs and Cranes

The equipment deployed for this project was selected based on its adaptability to weak soil conditions, large drilling depths, and limited working space on the bridge construction site.

DH500-5 Flexible-Leader Drilling Rig (02 units)

Type: Specialized flexible-leader drilling rig.
Drilling tool: R10.
High drilling depth capability with strong torque.
Application: Bored pile drilling D1200–D1500 in weak soils.

KH180-3 Drilling Rig (01 unit)

A well-known combined flexible-leader drilling rig from Hitachi.
Equipped with R10 drilling tool, flexible adjustment, suitable for both clay and silty sand.
Advantages: High stability in deep drilling operations and easy maintenance.

Crawler Cranes Supporting the Project

IHI CCH500 Crawler Crane (01 unit): 50-ton crawler crane, highly maneuverable and suitable for muddy and soft ground conditions.
KH180-3 Crane (01 unit): Used in combination with the drilling rig for installing reinforcement cages, handling tremie pipes, formwork, and related materials.

These machines share the following advantages:

High mobility on weak ground.
Easy assembly, disassembly, and spare parts replacement.
Optimized operation in the limited working space of river-side construction sites.

Effectiveness of the Applied Construction Solution at the Thai Binh River Overpass

The application of flexible-leader drilling rigs and a synchronized equipment fleet enables the project to:

Shorten construction duration compared to conventional methods.
Minimize borehole wall collapse risks in weak, water-saturated soils.
Improve accuracy in borehole depth and diameter, meeting design requirements.
Reduce labor and maintenance costs thanks to integrated and user-friendly equipment.
Ensure overall project schedule, contributing to the timely completion of the bridge works.

Conclusion

The Thai Binh River overpass is a key infrastructure project connecting Hai Duong Province with neighboring regions.
Construction of D1200–D1500 bored piles with a depth of 70 meters requires drilling equipment suitable for complex geological conditions.
The combination of DH500-5 and KH180-3 drilling rigs with CCH500 and KH180-3 crawler cranes represents an optimal solution.
This method ensures technical safety, construction efficiency, and cost-effectiveness for a major infrastructure project.

Contact for Equipment Consultation and Bridge Foundation Construction

Hanoi Vietnam Co., Ltd. specializes in supplying bored pile drilling equipment and executing foundation works for transportation infrastructure projects.