Resin-Grouted Rock Bolt Nozzle Docking Bush Sealing Design
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Solution Overview
Problem
Resin-grouted rock bolt assemblies face issues with strong installation force alignment, which can damage adapters and cause compressive damage to seals, preventing effective sealing engagement between the adapter, bolt, and sleeve.
Innovation Solution
A rock bolt assembly featuring a nozzle docking bush with a cylindrical body, annular ridges, and a grout distributing channel, where the central hole is designed for sealing engagement with the sleeve and bolt, allowing a sealed grout passage and enabling axial force application without damaging seals, using press-fitting or threaded engagement for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the adapter or seals are aligned in the line of action of the installation force, then the installation force can be applied to the rock bolt, but the adapter or seals will be damaged
Solution Approach 1:
The bush acts as an intermediary component between the adapter and the rock bolt. It has a central hole with a leading portion that receives the sleeve trailing end and a trailing portion that engages the bolt proximal end portion. This intermediary structure allows the installation force to be transmitted through the bush to the bolt without the force being applied directly to the adapter-seal-bolt interface, thereby preventing damage to the adapter and seals while still enabling effective installation.
2Force
If the adapter or seals are aligned in the line of action of the installation force, then the installation force can be applied to the rock bolt, but the seals will suffer compressive damage
Solution Approach 1:
The bush serves as a mediator that redirects the installation force path. The central hole of the bush provides a passage through which the force can be applied to the bolt without compressing the seals. The bush's structure allows the force to be transmitted axially through its body to the bolt engagement portion, keeping the force application line separate from the seal contact surfaces.
Solution Approach 2:
The bush introduces a new spatial dimension for force transmission. Instead of applying force directly along the adapter-seal-bolt interface (one-dimensional path), the bush creates a separate force transmission path through its central hole (another dimensional path). This allows the installation force to be applied in a different spatial configuration that avoids direct compression of the seals.
3Reliability
If a seal is positioned in the line of action of the installation force, then sealing engagement can be achieved, but the seal will be damaged by the installation force
Solution Approach 1:
The bush is positioned as an intermediary component between the sealing interface and the force application point. The sealing engagement occurs between the bush's central hole and the sleeve/bolt interfaces, while the installation force is applied through the bush's body structure. This spatial separation ensured by the bush allows reliable sealing without exposing the seals to damaging installation forces.
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 a resilient, grout-tight seal that is lateral to the installation force, preventing damage and ensuring effective grouting while allowing high-energy axial force application, ensuring the rock bolt assembly is securely anchored within the rock hole.
Implementation Method 1
The leading portion of the central hole may include a formation against which the trailing end of the sleeve is press-fitted in sealing engagement.
Implementation Method 2
The trailing portion of the central hole may be formed with threads to engage complementary threads on the proximal end portion of the bolt.
Implementation Method 3
each annular ridge is adapted to seal against a nozzle of a grout delivery system
Implementation Method 4
provide, on engagement of the nozzle with the bush, a sealed grout passage defined by the grout distributing channel, the aperture, the central hole and an interior of the sleeve
Data Source
AI summary
Disclosed is a rock bolt assembly including: an elongate bolt extending with distal and proximal ends; a tubular sleeve longitudinally extending between leading and trailing ends on the bolt so at least a proximal end portion projects from the trailing end of the sleeve; and a nozzle docking bush on the proximal end portion between the sleeve's trailing end and the bolt's proximal end. The bush has a cylindrical body between first and second ends, a central hole extending through the body, spaced-apart annular ridges on the cylindrical body, a grout distributing channel between the ridges, and an aperture in the channel connecting the channel and hole. The central hole includes a leading portion ending at the first end, sealingly receiving the trailing end. A trailing portion of the central hole ends at the second end and sealingly engages the bolt. Each annular ridge seals against a grout nozzle.