Cable Bolt Grouting Assembly for Synchronous Rock Support
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Solution Overview
Problem
The installation of cable bolts is more difficult and slower than rock bolts, leading to inefficiencies in underground excavation support processes due to the need for asynchronous installation with rock excavation activities, which is time-consuming and resource-intensive.
Innovation Solution
A method involving the delivery of a hardenable composition in liquid form through a delivery assembly, mixing components within the borehole, and allowing the composition to harden around a cable bolt, enabling simultaneous or near-synchronous installation with rock excavation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cable bolts are installed using conventional methods (grout pumped through small-diameter tubes from the open end), then the grout can be delivered to the distal position, but the installation process is difficult, slow, and must be done asynchronously from rock excavation activities
Solution Approach 1:
The patent inverts the conventional grout delivery approach by pumping grout from the blind end (distal end) toward the open end of the borehole, rather than from the open end to the distal end. This reversal allows the grout to push the cable bolt forward during insertion, significantly reducing installation difficulty and time while enabling synchronous installation with rock excavation activities
Solution Approach 2:
The patent applies preliminary action by pre-positioning the cable bolt in the borehole before grout delivery, and using the grout pumping process itself to advance the cable bolt to its final position. This eliminates the need for separate cable insertion operations and reduces the number of installation steps required
2Productivity
If cable bolts are installed asynchronously from rock excavation activities, then installation can be performed with existing equipment, but time is lost and resources are spread between primary and secondary support activities
Solution Approach 1:
The patent merges the cable bolt installation process with the rock excavation and primary support activities by enabling synchronous installation. The simplified grout delivery method from the blind end allows cable bolts to be installed as part of the primary support sequence rather than as a separate secondary support operation, consolidating multiple support tasks into one coordinated process
Solution Approach 2:
The patent enables continuous installation operations by allowing cable bolts to be installed synchronously with rock excavation activities. The grout delivery system operates continuously during cable insertion, eliminating idle time between drilling, cable placement, and grouting operations that would otherwise create gaps in the production cycle
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
Facilitates faster and more efficient installation of cable bolts during primary support, reducing the time and resource spread between primary and secondary support activities, thereby enhancing mining efficiency.
Implementation Method 1
a hardenable composition in liquid form at or near the blind end of the borehole and substantially filling the borehole with the hardenable composition from the blind end towards the open end of the borehole... allowing the hardenable composition to harden
Data Source
AI summary
A method of installing a grouted cable bolt, a system for providing same and components which may form part of the method and/or system including a delivery assembly comprising a delivery nozzle at a distal end of the delivery assembly; a mixing chamber in fluid communication with the delivery nozzle; a first line for conveying a first component to the mixing chamber; and, a second line for conveying a second component to the mixing chamber the first line being located within the second line, and wherein the hardenable composition in liquid form is formed from mixing the first component with the second component.