Modular Compaction Boring Head Minimizes Soil Disturbance
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Solution Overview
Problem
Current methods for underground construction, such as open-cut trenching, Horizontal Directional Drilling, and microtunneling, involve material removal and mechanical disturbance, which are undesirable for environmentally sensitive areas and lack the efficiency of compaction boring techniques.
Innovation Solution
A modular compaction boring device with a thrust module, anchor modules, and a rotatable boring head that extends and retracts to create a borehole with minimal soil disturbance, using an umbilical cable for power and control, allowing for precise orientation and advancement without spoils or drilling fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If open-cut trenching, HDD, or microtunneling is used for underground construction, then material can be removed and utilities can be installed, but mechanical disturbance of soil and generation of spoils occur which are harmful to environmentally sensitive areas
Solution Approach 1:
The invention extracts the harmful element of material removal from the construction process. Instead of removing soil and replacing it (as in HDD or trenching), the compaction boring device compactes the soil in-place to create the borehole, eliminating spoils generation and mechanical disturbance entirely. The boring head compactes soil laterally as it advances, creating a cavity-free passage.
Solution Approach 2:
The invention converts the natural resistance of soil (which normally opposes boring) into a beneficial compaction force. The lateral pressure exerted by the boring head on the soil matrix compacts the soil around the borehole, creating a stable, collapsed borehole that maintains its shape without requiring support structures or fluid injection.
2Object-affected harmful factors
If compaction boring is used to minimize soil disturbance, then environmental friendliness is improved, but the device complexity increases due to modular components and control systems
Solution Approach 1:
The compaction boring device is divided into modular segments including a boring head, thrust module, anchor modules, and control system. This segmentation allows each component to perform a specific function (boring, thrusting, anchoring, controlling) while enabling easy assembly, disassembly, and maintenance. The modular design manages complexity by organizing functions into discrete, manageable units.
Solution Approach 2:
The boring head serves multiple functions: it cuts through the soil, compacts the soil laterally to create the borehole, and maintains borehole integrity through its expansion mechanism. The anchor modules provide both stabilization during operation and retrieval capability, combining multiple functions in single components to reduce overall system complexity.
3Measurement precision
If anchors are extended and retracted to advance the tool, then precise positioning is achieved, but the duration of operation increases due to reciprocating motion
Solution Approach 1:
The anchor system operates through periodic cycles of extension and retraction. The anchors extend to engage with the borehole wall, providing reaction force for thrust. After thrust is applied, anchors retract to allow tool advancement, then extend again for the next thrust cycle. This periodic action enables precise positioning control while maintaining continuous progress through the subsurface.
Solution Approach 2:
The anchors extend and engage with the borehole wall before the thrust module applies force. This preliminary anchoring ensures that the reaction force is properly established before loading, preventing tool deflection or deviation. The preliminary action of anchor engagement enables precise positioning by ensuring force is applied exactly where needed before advancement occurs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables efficient and environmentally friendly underground construction by minimizing mechanical disturbance and spoils, maintaining borehole integrity, and allowing for flexible configurations to suit various soil conditions and applications.
Implementation Method 1
a boring head to compress the subsurface
Implementation Method 2
the umbilical cable provides power from the electrical power source to the modular compaction boring device
Data Source
AI summary
A modular compaction boring device. The boring device comprises a compaction boring head which creates a borehole through a subsurface by operation of a thruster and a rear and forward anchor. Extension of the thruster while the rear anchors are engaged move the boring head forward. Retraction of the thruster while the forward anchors are engaged brings the rear anchors forward for an addition stroke. A steering geometry in the boring head and rotation of the boring head allow steering of the boring device. Steering, thrust, and anchors may be controlled remotely through an umbilical cable pulled through the borehole by the boring device.