Large Woody Debris Flashcards
What are the 5 main steps to LWD installation?
Drilling wood holes Drilling rock holes Cleaning rock holes Run cable through and cut it Epoxy cable into rock holes
What general equipment is needed for creating LWD structures? (5)
Wood drills and ship auger bits Rock drills and bits Correct diameter cables Rock hole cleaning tools Epoxy
Wood drills and ship auger bits (3)
Correct diameter: 1/2 cable for 3/4 bit
Can have gas or electric drill (gas is dirtier and has carcinogens but electric requires cables and power source. Can buy cleaner gas but much more expensive)
Bits have drill head with spiralling that “cuts out” wood - need to put weight into it
Rock drills and bits (5)
Correct diameter: 1/2 cable = 9/16 bit or leave 1/16 gap for epoxy
Gas or electric available but gas very heavy
Bit is meant to drill (hammer drill) so no need to put pressure, as pressure might cause damage
Heat - need to clean and grease bit, and change it for every hole drilled to avoid damaging it, as they can be expensive
Drill to 10-inch depth
What needs to be considered when drilling into the log? (5)
Forced that will be acting on the structure
Rock hole location
Cable orientation
Where the “meat” of the log is
How this hole sets up the rest of the attachment point to the boulder
What needs to be considered when drilling into the rock? (3)
Orientation of the rock with respect to the wood holes and epoxy after drilling to depth
Potential chipping (drill perpendicularly to rock surface)
Proximity to other drilled holes, edge of rock, fissures - “Zone of Influence”
What is the equipment needed for cleaning rock holes? (4)
Water pump
Bucket of water
Wire brush
Turkey baster
What are the steps to cleaning rock holes? (5)
Clean drill dust off rock, rinse with water
Fully flush out hole with water
Scrub with wire brush
Repeat steps 2 and 3 three times or until hole is clean
Suck out remnants and check for turbidity
What equipment is needed for running cable? (4)
Wire rope (galvanized for freshwater, stainless steel for brackish water)
Anvil, grinder, ratcheting cable cutters
What are the steps to running cable? (4)
Tape end of cable whenever going through hole
No tape when going into the rock
Measuring tool to estimate excess
Cut and leave until 10 rock holes are ready to go
What are the types of epoxy used for LWD creation? (4)
Slow cure, water application - HIT RE-500
Fast cute, water ok - HIT HY-200R or HIT HY-200A
Tube lasts for about 10 10-inch deep holes
What are the steps to epoxy application? (8)
Nozzle extension secured Ensure both tubes pop at same time Baffles mix 2-parts Nozzle to bottom of hole, back off 1/2 inch Squeeze until you see epoxy at surface Press button to release pressure One finger on hole, remove straw Inject cable, do not move until fully cured
