Resin Anchored Rock Bolt Piercing Head Design
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Solution Overview
Problem
Resin anchored rock bolts face inefficiencies in mixing resin components and mechanical locking due to profiled surface compromises, leading to reduced load-bearing capacity and susceptibility to acid mine water penetration, exacerbated by eccentric insertion and gloving issues.
Innovation Solution
A resin bolt design featuring a positioning head with lobes that centralize the bolt, shred resin capsules to prevent gloving, and paddles for efficient mixing, along with a planar trailing surface for enhanced anchoring, addresses these issues by ensuring complete resin distribution and mechanical interlock.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rock bolt has a profiled surface with ridges to provide mechanical interlock for anchoring, then anchoring ability is improved, but mixing efficiency of resin decreases
Solution Approach 1:
The rock bolt surface is segmented into distinct functional zones: a leading end section with a crown and blending ridges for resin mixing, and a body section with profiled ridges for mechanical anchoring. This segmentation allows each zone to perform its specific function optimally without compromising the other.
Solution Approach 2:
Different surface qualities are applied to different parts of the rock bolt. The leading end section has a crown configuration with blending ridges that create turbulence for effective resin mixing, while the body section has profiled ridges that provide mechanical interlock for anchoring. Each local region has the quality needed for its specific function.
2Ease of operation
If the rock bolt is inserted eccentrically to the rock hole, then insertion is easier, but resin distribution becomes irregular causing insufficient mechanical interlock and increased corrosion risk
Solution Approach 1:
The leading end section of the rock bolt features an asymmetric crown configuration with blending ridges that are specifically designed to correct eccentric insertion. The asymmetric geometry creates forces that tend to center the bolt in the hole during insertion, ensuring uniform resin distribution despite initial eccentricity.
Solution Approach 2:
The crown and blending ridges at the leading end section perform preliminary action by correcting eccentricity and ensuring proper resin mixing before the main body of the bolt engages with the resin. This preliminary correction prevents irregular resin distribution from developing during insertion.
3Productivity
If the rock bolt uses a larger diameter to improve mixing efficiency, then mixing ability improves, but anchoring capacity in the rock hole decreases
Solution Approach 1:
Instead of relying solely on bolt diameter to improve mixing, the invention introduces a temporal dimension through the leading end section design. The crown and blending ridges create a progressive mixing action that occurs as the bolt is inserted, allowing effective mixing with a smaller diameter bolt that maintains better anchoring capacity.
Data Source
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AI summary
The invention he invention provides a resin bolt which includes an elongate shaft which extends between a leading end and a trailing end and a positioning head which is integral to the shaft at the leading end and which extends in the elongate axis of the shaft from a perimeter rim to a crown, with the head formed with a plurality of projections, with each projection extending laterally, beyond the radial dimension of the shaft and each projection having a leading surface which slopes, at least partially, from the crown to the perimeter rim, and a trailing surface from the perimeter rim to the shaft.