Inclined-Axis Boring Machine for Non-Rectilinear Trenches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for fabricating non-rectilinear trenches, such as curved or circular diaphragm walls, face challenges in achieving precise shapes due to uneven reboring thickness and excessive concrete consumption, leading to inefficiencies and high costs.
Innovation Solution
A boring machine with a first and second boring member, both with truncated cone shapes, where the first axis of rotation is inclined with respect to the second axis, allowing for a trapezoidal trench cross-section that enables consistent reboring and reduced concrete usage, facilitating the production of polygonal or ring-shaped walls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rectilinear trenches are produced using conventional boring machines with parallel axes, then the machine structure is simple and easy to operate, but the trenches cannot achieve precise circular or curved shapes
Solution Approach 1:
The patent applies asymmetry by inclining the second axis of rotation relative to the first axis. This asymmetric angular arrangement (typically 30-60 degrees) between the two boring members enables the cutting edges to trace circular or curved paths in the horizontal plane, transforming the machine's capability from rectilinear to curved trench fabrication while maintaining structural simplicity
2Shape
If conventional methods produce curved walls by reboring primary walls, then the wall shape can be achieved, but the reboring thickness becomes uneven with much greater thickness required on the inside of the curve
Solution Approach 1:
The patent applies preliminary action by using the first boring member to create an initial trench with a predetermined trapezoidal cross-section and inclination angle. This preliminary trench is specifically designed to facilitate subsequent reboring operations, ensuring that the second boring member can remove a uniform thickness of concrete to achieve the final circular shape, thereby avoiding excessive concrete removal
3Shape
If conventional reboring methods are used to produce curved walls, then the wall can be formed, but the power consumption and consumable cutting tool usage increase considerably
Solution Approach 1:
The first boring member performs a preliminary cutting action to create a trench with optimized geometry (trapezoidal cross-section with specific inclination). This preliminary action prepares the ground by removing excess material and creating favorable conditions for the second boring member, thereby reducing the energy required for the final shaping operation and extending cutting tool life
4Reliability
If reinforcement cages with sacrificial parts are used to maintain borepath during reboring, then the borepath can be maintained, but the fabrication cost of specific reinforcement cages increases
Solution Approach 1:
The patent replaces complex reinforcement cage structures with a preliminary geometric action. The first boring member creates a trench with predetermined dimensions and inclination angle that inherently maintains borepath stability during subsequent reboring operations, eliminating the need for specialized sacrificial reinforcement parts while ensuring reliable borepath maintenance
Data Source
AI summary
A boring machine for producing a trench in the ground including a chassis that extends in a longitudinal direction, the chassis having a lower end, the machine including a boring device mounted at the lower end of the chassis, the boring device including a first boring member which is rotary about a first axis of rotation, and a second boring member which is rotary about a second axis of rotation, the second axis of rotation and the first axis of rotation extending in a plane perpendicular to the longitudinal direction, wherein the first axis of rotation is inclined with respect to the second axis of rotation.