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TRANSCRIPT
RAMMED EARTH TIRE PACKING PROCESS DESIGN
DEREK SCHROEN BRADEN PIERCE RYAN GRYBA
https://redoubtreporter.wordpress.com/2010/04/28/house-fire-kindles-desire-for-recycled-eco-friendly-home/
Earthship Overview
http://newsfrombrighton.co.uk/brighton-property-news/brightons-eco-houses-to-open-their-doors-to-the-public/
http://spanners-in-the-works.blogspot.com/2008/05/tales-from-north-coast.html
http://www.adamtglass.com/wp-content/uploads/2010/09/question2-724662.jpg
http://www.youtube.com/watch?v=qXws6X7rEsI
Current Methods Innovative Solution
Project Objectives
Portable, Lightweight
Drastically reduce manual labour
Reduce Cycle time
Consistent packing density
Cost Effective
Concept Evolution
Small Scale Testing
Test 1 - Current Method Test 2 – Sidewall Removal
Test 3 – Packing Methods Test 4 – Raised Sidewall
Process Design
Two primary designs selected for packing a tire:
Lateral Packing Device
Vertical Tamping Device
Difficult to pack under sidewall
Four bar linkage was designed to give access to sidewall region
The devices are to be used together in a 2-stage process.
Hydraulic Lateral Packer Ergonomic design integrating many “off the shelf”
components
Components: Double acting cylinder, for directional control
Top and Bottom plates
Handle fixed to the cylinder to facilitate ease of use
Hydraulic Control Valve on Handle for actuation of piston
Process: 1. Soil placed in sidewall region
2. Assembly placed in tire center using handle fixture
3. Piston extended to pack soil using Hydraulic Control Valve
4. Piston retracted using Hydraulic Control Valve
5. Assembly rotated in 45 degree increments to pack soil
6. Process repeated until sidewall region is fully packed
Handle Hydraulic Control Valve
Before After
Vertical Tamper Selection
• Sullair MTB-6 pneumatic backfill tamper
• Used to pack center tire region with vertical vibration
• Delivers 500 blows per minute at 32 CFM
• Light weight design, total weight < 25 [kg]
• Total height of 4 ft for operator compatibility
• Low cost
Handle
Packing Plate
Direction of Vibration
Air Valve
http://www.sullair.com/Files/Sullair/Global/US-en/construction/mbt_20080821.pdf
http://www.youtube.com/watch?v=2A3IKF2C1b8
Sidewall Lifting Mechanism
Features: Simple, 4-Bar Clamping Mechanism
Accommodates a full range of tire sizes and profiles
Increases accessibility to tire interior
Secures tire position on wall during packing
Process:
1. Make adjustment for tire profile and width
2. Attach Bead Hook to underside of tire upper sidewall
3. Swing handle down, lock in place
4. Repeat on other side of tire
Rammed Earth Tire Packing
Designed Process
1. Fill and pack the sidewall region of the tire using the Hydraulic Lateral Packer
2. Deploy 2 Raised Sidewall Fixtures on opposite sides of the tire.
3. Pack central region of tire with the Pneumatic Backfill Tamper.
Project Summary
Advantages / Drawbacks
Drastic reduction in labour input
No time savings projected, more consistent cycle time
Cost
Components total ~$1600
Schedule
Project Final Report delivered to client December 6, 2010
Project Recommendations
Prototype the Hydraulic Cylinder Assembly and Raised Sidewall Fixture Acquire a Sullair MT-6 Backfill Tamper Conduct further testing to validate design performance Build a Rammed Earth Tire Structure
Questions?