Bored Pile Drilling With Expandable Rectangular Cutters
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Solution Overview
Problem
Current drilling technologies for reinforced concrete bored piles require complex and inefficient processes due to the need for changing drilling tools and adjusting verticality, especially when forming rectangular holes, which are unsuitable for permanent underground structures.
Innovation Solution
A drilling device that combines soil cutting and excavation to form a pile hole with an upper rectangular section and a lower circular section simultaneously, using a scalable drill rod, rotary drill bit, and rectangular cutter, with verticality adjustment integrated into the process, allowing for the formation of a three- or four-section pile hole with variable cross-sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional rectangular hole drilling bits are used to form rectangular holes, then rectangular pile holes can be formed, but the drilling head must be replaced after forming round holes, requiring readjusting of verticality, which makes the process complex and inefficient
Solution Approach 1:
The patent combines the round hole drilling function and rectangular hole drilling function into a single integrated drilling device. The expandable drill rod system allows the same drilling assembly to first form a round hole and then expand to form a rectangular hole without requiring tool replacement, merging two separate operations into one continuous process.
Solution Approach 2:
The drill rod system is designed to be dynamically expandable, transitioning from a compact round configuration to an expanded rectangular configuration. This dynamic transformation allows the drilling device to adapt its shape during the drilling process, enabling both round and rectangular hole formation with a single tool while maintaining operational efficiency.
2Adaptability or versatility
If rectangular hole drilling is performed with traditional methods, then rectangular piles can be formed, but the hole width is generally greater than 2 meters, making it unsuitable for the field of permanent support for underground structures
Solution Approach 1:
The expandable drill rod system allows precise control over the final hole dimensions. By dynamically adjusting the expansion degree of the drill rod, the system can form rectangular holes with optimized widths suitable for permanent underground structure support, rather than the excessively wide holes produced by traditional rectangular drilling bits.
3Productivity
If the drilling device forms pile holes with variable cross-sections in one go, then construction speed is improved and verticality is improved, but the device structure becomes more complex with scalable drill rods and cutters
Solution Approach 1:
The expandable drill rod system employs a nested structure where multiple drill rod segments are contained within each other in a compact state. During operation, these nested segments are sequentially deployed outward to achieve the desired rectangular cross-section, allowing the device to maintain a compact storage form while providing complex variable cross-section drilling capability.
Data Source
AI summary
A drilling device for a reinforced concrete bored pile includes drilling masts, a scalable drill rod, a rotary drill bit, a rectangular cutter and scalable cutter rods. A top end of the scalable drill rod is connected to the drilling masts, the rotary drill bit is disposed on a bottom end of the scalable drill rod, the rectangular cutter is disposed above the rotary drill bit and defines a first drill rod hole, the scalable drill rod is disposed to pass therethrough. Bottom ends of the scalable cutter rods are connected to the rectangular cutter, and top ends of the scalable cutter rods are connected to a horizontal constraint platform, on which an impact component is provided. The horizontal constraint platform is disposed below the top end of the scalable drill rod, and the scalable drill rod passes through the horizontal constraint platform and the impact component.