Setting New Standards in Bridge Pile Foundation Engineering

The HPR35 small rotary drilling rig from APIE FOUNDATION EQUIPMENT (CHINA) LIMITED has proven its capabilities in specialized foundation projects, particularly in bridge construction where precision, power, and portability are essential. This case study demonstrates how our small rotary drilling equipment successfully completed a challenging bridge foundation project in developing regions.

Project Challenge: River Bridge Foundation Installation

A municipal infrastructure project required the construction of a pedestrian bridge spanning 60 meters across a small river. The foundation work involved installing 28 concrete piles with varying diameters of 500mm, 700mm, and 900mm, reaching depths of 10-12 meters through alternating layers of clay, sand, and gravel deposits.

Key project constraints included:

  • Limited site accessibility near the riverbank
  • Seasonal water level variations affecting working conditions
  • Strict environmental regulations regarding noise and vibration
  • Budget constraints requiring cost-effective foundation solutions

HPR35 Small Rotary Drilling Rig Solution

The project team selected the HPR35 small rotary drilling rig for its unique combination of power and portability:

Key Technical Advantages:

  • Optimal Drilling Specifications: Maximum 12m drilling depth and 380-1000mm diameter range perfectly matched project requirements
  • Compact Transportation: 2.9m transport height without Kelly bar allowed easy access through existing road infrastructure
  • Robust Power System: 35kNm rotary head output torque with 7-40rpm rotation speed provided versatility for different soil conditions
  • Efficient Winch System: 45kN main winch capacity and 60m/min lifting speed optimized operational efficiency

Execution Highlights

Phase 1: Site Preparation and Mobilization
The small rotary drilling rig was transported to site in standard flatbed trucks, minimizing mobilization costs. The 9,300kg operating weight and compact 4.36m length allowed easy positioning on the restricted riverbank site.

Phase 2: Drilling Operations
Using the HPR35’s advanced features:

  • Kelly Bar Configuration: 325×6×2.4mm system provided stability during deep drilling operations
  • Mast Flexibility: Adjustable tilt angles (lateral 15°, forward 10°, backward 15°) enabled precise pile positioning
  • Pressurization Control: 1000mm stroke with 40kN pressure force maintained drilling stability in challenging soil layers
  • Auxiliary Winch Support: 10kN auxiliary winch with 40m/min lifting speed facilitated material handling

Phase 3: Quality Assurance
The small rotary drilling equipment delivered consistent hole quality with minimal deviation, meeting all engineering specifications for verticality and diameter tolerance.

Performance Metrics

The HPR35 small rotary drilling rig achieved impressive results:

Parameter Achievement
Total Piles Installed 28 piles completed
Average Drilling Time 45 minutes per 10m pile
Daily Production 6-8 piles
Fuel Efficiency 12 liters per hour average
Maintenance Downtime Less than 2%

Customer Benefits

The client highlighted several key advantages of choosing the HPR35 small rotary drilling rig:

  1. Cost Efficiency: 35% lower operational costs compared to larger drilling rigs
  2. Environmental Compliance: Low noise and vibration met local environmental regulations
  3. Versatility: Adapted easily to varying soil conditions and pile specifications
  4. Reliability: 99.8% operational uptime throughout the project
  5. Support: Responsive technical support from APIE FOUNDATION EQUIPMENT team

Industry Impact

This project demonstrated how small rotary drilling rigs can effectively handle traditionally large-rig applications while offering superior mobility and cost-effectiveness. The success has led to the adoption of HPR35 units in similar infrastructure projects across the region.

Ready to Optimize Your Foundation Projects?
Contact APIE FOUNDATION EQUIPMENT (CHINA) LIMITED for expert consultation on small rotary drilling solutions:

  • Technical Inquiries: apie@apiepiling.com
  • Direct Communication: +86 189 2128 7030 (WhatsApp available)
  • Online Catalog: http://www.apiefoundation.co
  • Product Focus: Construction machinery and equipment and accessories, specializing in small rotary drilling rigs