Cable Rock Bolt Installation Machine with Pre-Anchoring
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Solution Overview
Problem
Current methods for installing cable rock bolts in underground mining are inefficient, requiring a two-stage process with primary solid bar bolts for immediate support until cable bolts cure, leading to delays and safety concerns, and result in significant tension loss due to the limited length of cable that can be tensioned effectively.
Innovation Solution
A machine and method that includes a drill, grout delivery system, cable dispensing arrangement, and a rotatable cartridge with bore anchors to allow immediate tensioning of cable rock bolts, eliminating the need for primary bolts and reducing tension loss by anchoring the cable at the leading end, enabling full-length tension application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cable rock bolts are installed using traditional grout curing methods, then the cable bolts can provide long-term strata support, but the installation process requires waiting 3-4 weeks for full curing, delaying tunnel development
Solution Approach 1:
The patent applies preliminary action by pre-installing solid bar primary bolts that provide immediate strata support before the cable bolt grout cures. This preliminary support system is in place during the entire curing period, ensuring continuous protection while eliminating the waiting time for cable bolt effectiveness.
Solution Approach 2:
The patent uses solid bar primary bolts as an intermediary support system that bridges the time gap between cable bolt installation and grout curing. The primary bolts serve as a temporary but effective mediator that maintains strata stability until the cable bolts become fully operational.
2Reliability
If primary solid bar bolts are installed to provide immediate support, then strata stability is maintained during curing, but the overall support system requires two stages and increases device complexity
Solution Approach 1:
The patent merges the functions of primary immediate support and secondary long-term support into a coordinated two-stage system where solid bar primary bolts and cable bolts work together. The primary bolts provide immediate support while the cable bolts provide long-term support, and both are installed and integrated as part of a unified support strategy.
3Reliability
If cable bolts are tensioned after grout curing, then the cable is securely held in the bore, but significant tension loss occurs because only the short protruding end (0.3m) can be effectively tensioned
Solution Approach 1:
The patent applies preliminary action by pre-anchoring the leading end of the cable to the rock face using a rock plate and anchor mechanism before tensioning. This preliminary anchoring creates a secure fixed point that allows the full length of the cable to be effectively tensioned, eliminating tension loss along the embedded portion.
Solution Approach 2:
The patent uses a rock plate that replicates the anchoring function at the rock face, creating a counterbalance to the cable tension. The rock plate with its anchor mechanism effectively copies the anchoring capability, allowing tension to be applied uniformly throughout the cable length rather than losing tension in the embedded portion.
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
Provides immediate strata support, reduces installation time and personnel requirements, and minimizes tension loss, allowing for safer and more efficient tunnel development with reduced reliance on specialized equipment and personnel.
Implementation Method 1
a drill for drilling a bore into a rock wall
Implementation Method 2
a grout delivery system for delivering grout into the bore
Implementation Method 3
a cable anchoring mechanism for anchoring the leading end of the cable within the bore
Implementation Method 4
a cable tensioning mechanism for applying tension to the cable to place the rock substrate in compression
Data Source
Figure 1a~1f
Figure 2~3
AI summary
A machine (10) for installing cable bolts, including a drill (11) for drilling a bore (12) into a rock wall (13), a grout delivery system (15) for delivering grout (16) into the bore (12), a cable dispensing arrangement (24) for dispensing cable (23) into the bore (12), an attachment device (30) for attaching a bore anchor (21) to the leading end (22) of the cable (23) prior to the cable bolt being fed into the bore (12), and a severing device (35) for severing the cable (23) to form a trailing end (40). A method of installing a cable rock bolt into a bore is also provided.