Single-anchor centrally grouted full-length anchored steel wire bundle
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Solution Overview
Problem
Existing anchor rod-rope supporting systems in deep roadways are inadequate in controlling deformation due to short anchor rods and long anchor ropes, leading to stress concentration and instability, which restricts tunneling speed and causes mining imbalance.
Innovation Solution
A single-anchor centrally grouted full-length anchored steel wire bundle with a central pipe and parallel steel wires, featuring a slurry output bracket, large stirring jackets, and a threaded casing, allowing for uniform stress distribution and easy installation, enabling full-length anchoring without affecting tunneling speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If anchor rods are used in existing supporting systems, then installation is simple, but the anchor rods are too short to control the deformation of deep surrounding rock
Solution Approach 1:
The steel wire bundle is divided into multiple steel wires (typically 7 wires) bundled together, with each wire contributing to the overall anchoring length. This segmentation allows achieving greater effective anchoring length while maintaining installation feasibility through standardized bundling procedures
Solution Approach 2:
The steel wires are nested within a central pipe that extends the full length of the anchor, allowing grout to flow through the central pipe and bond all wires together. This nested structure enables full-length anchoring while simplifying installation through a single integrated unit
2Length of moving object
If anchor ropes are used in existing supporting systems, then anchoring length is sufficient, but they are too long to provide effective support within their ranges
Solution Approach 1:
The steel wire bundle concentrates strength at the head portion where the steel wires are densely bundled and grouted, providing high support effectiveness in the critical zone near the roadway. The central pipe ensures uniform stress distribution along the entire length, optimizing both local and global performance
Solution Approach 2:
The steel wire bundle combines multiple steel wires with a central pipe and grout material to create a composite anchoring system. This composite structure provides both sufficient length for deep anchoring and concentrated strength for effective support through the synergistic combination of components
3Productivity
If alternative construction of anchor rods and anchor ropes is adopted, then different support needs are met, but the construction procedures are complex and restrict the improvement of roadway tunneling speed
Solution Approach 1:
The steel wire bundle merges the functions of multiple individual anchors into a single integrated unit with multiple steel wires working together. This combining eliminates the need for alternative construction of different anchor types, simplifies installation procedures, and enables full-length anchoring in one operation, thereby increasing roadway tunneling speed
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 solution provides uniform stress distribution, reduces stress concentration, enhances anchoring effectiveness, simplifies construction, increases tunneling speed, and ensures stability of deep roadways, addressing the issues of deformation and instability.
Implementation Method 1
a single-anchor centrally grouted full-length anchored steel wire bundle
Implementation Method 2
the central pipe is provided with a slurry output bracket which divides the main body of steel wire bundle into a front part and a rear part
Implementation Method 3
the front part of the main body of steel wire bundle is provided with a plurality of large stirring jackets
Implementation Method 4
a threaded casing is provided on the tail end of the rear part of the main body of steel wire bundle, a tray and the nut are arranged on the threads
Implementation Method 5
the tray and the nut are arranged on the threads
Implementation Method 6
multiple strands of parallel steel wires which are arranged in parallel around the central pipe
Implementation Method 7
full-length anchored steel wire bundle
Data Source
AI summary
A single-anchor centrally grouted full-length anchored steel wire bundle and a supporting method thereof are described herein. The steel wire bundle consists of parallel steel wires and a central pipe, wherein multiple strands of parallel steel wires are arranged around the central pipe, the central pipe is provided with a slurry output bracket which divides the parallel steel wires into a front part and a rear part, the front part is provided with large stirring jackets, and the rear part is provided with a threaded casing on its tail end. After the coal is cut by a tunneling machine and a roadway is formed, the steel wire bundle is anchored at the ends, and the roadway tunneling speed is increased; central grouting is carried out for the steel wire bundle so as to anchor the steel wire bundle in full length and ensure long-time stability of the roadway.