Projects
Project for Renovation and Upgrading of Provincial Road ĐH60, Ân Thi District (Km0+500 – Km3+500 Section)
The renovation and upgrading project of ĐH60 Road, from Km0+500 to Km3+500, located in Ân Thi District (Hưng Yên Province), is currently under implementation, with one of its key components being the construction of the new Vân Bridge – a structure spanning an inter-regional irrigation canal.
The investment in constructing Vân Bridge not only aims to improve traffic capacity and reduce localized congestion, but also contributes to enhancing local transportation infrastructure connectivity, thereby supporting socio-economic development in the southern area of Ân Thi District and neighboring communes.
Geotechnical Analysis of Vân Bridge – ĐH60 Section, Ân Thi District
The geotechnical survey results at the Vân Bridge construction site (Ân Thi, Hưng Yên) indicate a clearly stratified soil profile with multiple weak soil layers interbedded with stronger bearing layers, directly influencing the design and construction solutions for bored pile foundations.
Below is a detailed analysis of each geological layer:
Layer KQ – Fill soil (resulting from previous ground leveling)
- Composition: Clay mixed with brick debris, gravel, and plant roots
- Characteristics: Non-uniform, low compaction, prone to differential settlement
- Remarks: Must be completely removed within the foundation construction area and must not be used as a structural bearing layer.
Layer 1 – Brown to brownish-gray clay; soft plastic state
- Characteristics: Low bearing capacity, high compressibility
- Risks: May cause pile deviation if foundations are placed directly, affecting borehole wall stability
- Solution: Drill completely through this layer; pile toe should not be terminated here
Layer 2 – Clay mixed with organic matter; greenish-gray to dark gray; soft plastic
- Characteristics: Contains organic materials, high cohesion but weak strength
- Technical risk: Increased risk of bentonite fluid loss, potentially leading to borehole collapse if not properly controlled
- Measures: Strict control of drilling fluid is required, or casing should be used if the layer thickness is significant
Layer 3 – Fine sand; light gray to greenish-gray; loose structure
- Properties: Weak sand with low bearing capacity, easily washed away in the presence of groundwater
- Drilling considerations: Borehole walls must be carefully stabilized; drilling fluid pressure should be monitored to prevent bottom collapse
Layer 4 – Flowing plastic clay; brownish-gray to greenish-gray
- Characteristics: Low stability, significant deformation under load
- Risks: Easily absorbs water and damages borehole walls; rapid drilling through this layer is required
- Recommendation: Pile toe must not be placed in this layer; deeper penetration is required
Layer 5 – Soft plastic clay; greenish-gray to brownish-gray
- Characteristics: Weak and soft, similar to Layer 1 but with higher moisture content
- Impact: Acts as a cushion above bearing layers, poor load transfer capability
- Handling: Drill through quickly; pile toe should not terminate in this layer
Layer 6 – Fine sand interbedded with thin clay layers; yellowish-gray to brownish-gray; medium dense
- Characteristics: Moderate bearing capacity, suitable as a transition layer
- Role: Pile toe may be placed here if drilling depth is limited
- Note: Density should be carefully verified using SPT or CPT tests before final decision
Layer TK – Sandstone; brown to yellowish-brown
- Characteristics: Excellent properties, high bearing capacity, long-term stability
- Application: Ideal foundation layer for high-load bored piles
- Note: If fractured or non-homogeneous rock is encountered, pilot drilling and pressure grouting are required
Layer 7 – Fine sand; yellowish-brown to brownish-gray; medium dense
- Characteristics: Fairly good bearing capacity, relatively stable
- Application: Can be utilized as pile toe bearing layer at medium depths
Layer 8 – Fine sand; greenish-gray to light gray; medium dense
- Remarks: Similar to Layer 7 but with better uniformity
- Role: Enhances pile shaft friction, contributing to long-term structural stability
Layer 9 – Fine sand; brown to brownish-gray; dense structure
- Characteristics: The strongest bearing layer within the entire soil profile
- Recommendation: If drilling reaches this layer, pile toe should be placed here to fully utilize bearing capacity
- Advantage: Ensures uniform and stable load transfer during service life
Overall assessment indicates that the soil profile at the Vân Bridge site shows a clear contrast between weak upper layers and strong bearing layers at greater depths. This condition requires careful calculation and control in bored pile construction to avoid borehole fluid loss or bottom collapse.
Selected Construction Method – Efficient and Safe
After thorough evaluation of geological and hydrogeological conditions, Hanoi Vietnam Co., Ltd. proposed and implemented the flexible-leader bored pile drilling method, utilizing modern equipment well-suited to site conditions:
KH125-3 Flexible-Leader Piling Rig
- Function: Drilling large-diameter bored piles at significant depths.
- Working scope: From natural ground level, drilling through soft clay layers down to dense sand or sandstone.
- Advantages:
- Self-propelled, independent operation without large auxiliary equipment.
- Stable drilling through weak soils with good borehole wall retention.
- Well-suited for canal-side projects with limited working space.
PC120-6E Backhoe Excavator
- Task: Earthworks, site clearing, and support for pile construction areas.
- Advantages:
- Backhoe bucket performs effectively on uneven terrain.
- Seamless coordination with the KH125-3 rig, optimizing borehole preparation time.
This equipment combination ensures construction progress, foundation safety, and minimizes technical risks under complex soil conditions such as those at the Vân Bridge site.
Quality Commitment from Hanoi Vietnam Co., Ltd.
We – Hanoi Vietnam Co., Ltd. – with extensive experience in deep foundation works, bored pile construction, and weak soil treatment – are committed to delivering stable construction quality and ensuring long-term structural safety.
Contact Information:
- 🌍 Website: https://mayxaydunghanoi.com
- 📲 Facebook: facebook.com/khoandapcap
- 📞 Mr. Đông Sài Gòn – +84 842 601 755
- 📩 Email: hanoi.trandong@gmail.com
Construction Images – Renovation and Upgrading Project of ĐH60 Road, Ân Thi District (Section from Km0+500 to Km3+500)
*Liên hệ nhận thông tin và báo giá: https://mayxaydunghanoi.click/
