Introduction

In modern urban environments, space constraints are one of the greatest challenges in foundation construction. From bridge underpasses and subway stations to indoor factory renovations and high-rise basements, traditional rotary drilling rigs are often too tall or bulky to operate effectively. This is where low headroom piling rigs come into play — compact, powerful, and specifically designed for restricted-height working conditions.

A low headroom rotary drilling rig is a type of foundation equipment designed to operate in environments with limited vertical clearance, typically below 10 meters. Unlike conventional rigs, it features a specially engineered mast and kinematics system that allows the rig to perform deep drilling without the need for full mast extension.

These machines are increasingly vital in inner-city construction, underground transportation hubs, or inside existing structures where overhead space is highly restricted.

The KR250CS, developed and distributed by APIE (Alliance of Piling Industry Elites), is one of the most versatile and powerful low headroom rigs on the market. Here’s what sets it apart:

Ultra-Low Working Height

Operating height can be reduced to as low as 8.5 meters, making it suitable for underground parking structures, tunnels, and beneath elevated roads.

High Torque Performance

The rotary drive delivers a maximum torque of 260 kN·m, capable of drilling through stiff clays, gravel layers, and mixed soils.

Deep Drilling Capacity

Despite its compact size, the KR250CS can reach drilling depths of up to 60 meters, meeting the requirements of most urban piling applications.

Modular & Transport-Friendly Design

The machine is designed for fast assembly and disassembly, allowing quick relocation between job sites and easy containerization for international shipping.

Intelligent Control System

Equipped with a user-friendly operating interface and real-time data monitoring, the KR250CS helps operators maintain accuracy, safety, and efficiency throughout the drilling process.

Common Applications

  • Urban high-rise foundation piles

  • Underpass and tunnel construction

  • Deep excavation support near existing structures

  • Projects with strict height clearance (metro, factories, airports)