Rigid-Flexible Vibratory Grouting Rod for Saturated Sandy Soil
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Solution Overview
Problem
Conventional grouting rods lack a vibration function or have poor vibration effects, and do not possess a rigid-flexible conversion function, making it difficult to effectively inject slurry into saturated sandy soil layers, which are prone to sudden deformation and poor self-stabilization.
Innovation Solution
A vibratory grouting rod with a drill bit, vibration part, flexible shock absorption device, slotted connection part, connection tail part, and rigid-flexible conversion device, allowing for rigid and flexible modes to protect the shock absorption device during drilling and concentrate vibration for effective grouting in sandy soil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional grouting rod is used without vibration function, then the structure is simple, but the grouting effect in saturated sandy soil is poor and slurry injection is difficult
Solution Approach 1:
The patent combines drilling function and vibration function into a single grouting rod body. The drill bit is integrated at the front end of the vibration part, allowing the rod to perform both drilling and vibratory grouting operations without requiring separate equipment, thus improving grouting effectiveness while maintaining reasonable structural complexity
Solution Approach 2:
The grouting rod is designed with multi-functionality, serving as both a drilling tool and a vibration source. The rod can switch between rigid mode for drilling and flexible mode for vibration, enabling it to adapt to different operational requirements within a single device structure
2Productivity
If rigid mode is used during drilling, then the drill bit can effectively drill, but the shock absorption device may be damaged without protection
Solution Approach 1:
The rod structure transitions from a static design to a dynamic one, where the rigid-flexible conversion device can switch between rigid and flexible states. During drilling, the system adopts rigid mode for efficient drilling, while the conversion device protects the shock absorption device; during grouting, it switches to flexible mode for vibration
Solution Approach 2:
The rigid-flexible conversion device acts as an intermediary between the drill bit and the shock absorption device. It provides mechanical protection to the shock absorption device during drilling by isolating it from drilling stresses, while still allowing the drill bit to function effectively
3Reliability
If flexible mode is used during grouting, then vibration can be concentrated in sandy soil, but vibration may transmit upward to connection parts
Solution Approach 1:
The rod structure implements local quality differentiation where different sections have different mechanical properties. The vibration part and shock absorption device are designed with specific local characteristics that enable vibration concentration in the sandy soil layer while preventing upward transmission to connection parts
Solution Approach 2:
The shock absorption device is pre-positioned and designed to provide cushioning before vibration transmission occurs. This beforehand cushioning prevents vibration from propagating upward to the connection parts while allowing effective vibration in the target soil layer
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
The vibratory grouting rod effectively reduces the effective stress between soil particles, facilitating slurry diffusion and preventing vibration transmission, ensuring efficient grouting by concentrating vibration in the sandy soil layer and protecting the shock absorption device.
Implementation Method 1
the flexible shock absorption device plays a damping role, to prevent vibration from upward transmission to the slotted connection part and the connection tail part
Implementation Method 2
the flexible shock absorption device plays a damping role, to prevent vibration from upward transmission
Implementation Method 3
Under the flexible mode, vibration is concentrated in the sandy soil around the vibration part. When the sandy soil is disturbed, the effective stress between soil particles is reduced
Data Source
AI summary
A vibratory grouting rod with drilling and vibrating functions includes: a drill bit, a vibration part, a flexible shock absorption device, a slotted connection part, a connection tail part, and a rigid-flexible conversion device; wherein the vibration part, the flexible shock absorption device, the slotted connection part and the connection tail part are sequentially jointed to form a grouting rod body, and the grouting rod body has a holding cavity; the drill bit is provided at a front end of the vibration part; and the rigid-flexible conversion device is movably sleeved on the flexible shock absorption device, which is configured to move up and down in a bar-shaped slot of the slotted connection part. The rigid-flexible conversion device can be pushed down to a rigid mode for drilling, and pulled up to a flexible mode for grouting with vibration concentrated around the vibration part.