Injection Bolt Profiled Bore Static Mixer Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing injection bolts with static mixers face challenges in maintaining precise positioning and thorough mixing of anchoring materials due to the risk of the static mixer slipping and the need for high pressure, which can lead to incomplete or premature curing of the anchoring components before they reach the rock mass.
Innovation Solution
A method and design for producing injection bolts with a fixed static mixer, where the mixer is securely positioned within the shaft using a profiled internal bore, allowing for precise and unimpeded mixing and immediate introduction of quick-cure anchoring materials, with the profile ensuring the mixer's location is maintained during operation and enhancing the anchoring material's keying into the rock mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the static mixer is positioned precisely in the internal bore, then thorough mixing of anchoring components is achieved, but the mixer may slip downward under high pressure during operation
Solution Approach 1:
The internal bore is segmented into different profile sections along its length. These profile sections create distinct zones that interact with corresponding features on the static mixer, dividing the fixing function into multiple engagement points rather than relying on a single positioning mechanism.
Solution Approach 2:
The profile of the internal bore is designed with asymmetric features that correspond to asymmetric features on the static mixer. This asymmetric pairing ensures unidirectional engagement that prevents downward slipping while allowing proper insertion and positioning during assembly.
2Stress or pressure
If high pressure is applied to press anchoring components through the static mixer, then mixing is achieved, but the mixer may move or slip from its predetermined position
Solution Approach 1:
The profiled internal bore creates counteracting mechanical engagement features that balance and counter the downward force generated by high pressure injection. The profile sections act as mechanical counterweights that resist the pressure-induced slipping force, maintaining the mixer's predetermined position throughout the injection process.
3Reliability
If the static mixer is fixed securely in the internal bore, then positioning is maintained, but the structure becomes more complex requiring additional components like cladding pipes
Solution Approach 1:
The fixing function is merged into the internal bore structure itself through profile sections that are integral to the shaft. This eliminates the need for separate fixing components such as cladding pipes, adhesives, or mechanical fasteners, as the profiled bore directly provides the securing mechanism through its geometric features.
Solution Approach 2:
The profiled internal bore serves multiple functions simultaneously: it guides the static mixer into the correct predetermined position, secures the mixer against pressure-induced slipping, and maintains the mixer's position throughout operation. This multi-functionality eliminates the need for separate specialized components for each function.
Data Source
AI summary
The invention provides an injection bolt for use in securing a rock mass having:a shaft for insertion into a hole in the rock mass which shaft has a profile and forms a profiled internal bore which bore has an inlet suitable for connection to an anchoring material pump and an outlet for injecting anchoring material into the hole in the rock mass; anda static mixer for mixing multiple components of the anchoring material; wherein the internal bore comprises the static mixer which is fixed in place by the profile; and a method for its production.