MSHA - Interactive Training - JTA Spiders - Table of Contents

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	Driller
	Contact: Palmer.Melvin@dol.gov

1. Start of Shift

Clock in at scalehouse

Talk to supervisor

Get instructions

Amount of drilled holes

Discuss Ground hazard analysis

Tool box meeting

Productivity issues

Enter Sub-topic

Conduct site inspection/workplace exam

Area

Loose materials

Document completion of inspection/exam

Imminent danger issues

Obtain necessary fall protection equipment

Obtain necessary supplies

Hydraulic and motor oil

Rags

Dust mask (in bulk)

Penetrating oil

Conduct Part 46 Training

2. Equipment Pre-op

Check oil levels

Check transmission fluid (Dextron 3)

Check anti-freeze

Check straps and hoses

Check for fluid leaks

Check chocking/blocking

Check hose couplings for safety ties/retainers

Compressor and alternator

Check oil level

Check hydraulic fluid level

Check rock drill oil level

Check water level

Check hydraulic and air hoses

Rust

Make any necessary adjustments

Check drill mast

Wear

Centralizer assembly

Hydraulic oil hoses

Rod couplings for cracks

Drill bits for wear and tear

Check striking bar/hammer

Leaks (air, water)

Enter Sub-topic

Wear and tear on guide

Check for cracks in frame, etc.

Press down on by-pass

Hold by-pass for 20 seconds

Turn ignition key on

At least 10 minutes in cold weather

At least 5 minutes in warm weather

Check compressor gauges

Aprx. 40 psi at startup

120 psi working

Air temperature

Water temperature

180 - 200 degrees

Turn air solenoid switch on to drill

Look/listen for air leaks

Enter Sub-topic

4. Pattern Set-up

Ground Hazard Analysis

Level area if needed

Remove berms/boulders if necessary

Place necessary signage

Restricted/blasting area, etc.

Check with supervisor

Number of holes, depth, spacing, burden

Driller determines pattern

Consult with supervisor

Consider wall angle and toe for first line

Try to keep pit bottom level for haulage operations

Square pattern off

Measure off drill hole pattern

Use stemming pole or tape measure

Measure first and second rows

Begin drilling with second row

Second row will be used for fall protection

Drilling subsequent rows

Measure off as needed to keep rows as straight as possible

The closer the holes are, the finer the shot rock will be

The farther apart the holes are, the larger the shot rock will be

Always recheck holes

5. Unusual Conditions

Check holes for water

Could result in overloading and/or bad shot

Over six inches of water

Pack with shavings to absorb the water

Blow hole out with drill air

Drilling on steep slopes

Not a one-person job

Communications between drill operator and wench operator

Need to coordinate activities

Establish anchor points

Examine cable and hook for defects

Never saddle a dead horse

Use separate anchor points for machine and driller

Anchor for machine must be a much heavier rod than one used for personal fall protection

Use a shieve wheel at the anchor point

Always have a double hook-up to the drill

Cable comes from drill through shieve back to drill

Use mast and boom to balance machine

Electrical storms

Lower mast and shut down machine

Report to supervisor

Drill adjacent hole (1-2' distance)

Fill unused hole with dirt

Attempt to remove

Check with supervisor

Drill adjacent hole (1-2')

Fill unused hole with dirt

Compressor fire

Use extinquisher

Do not open doors if hot to touch

Stored on compressor

Stored in truck

Notify supervisor/co-workers in area

Medical emergencies

Provide first aid

Request assistance

Provide two-way radio

Fuel

Use 55-gallon drum to clean up and properly dispose of

Used as a by-product (asphalt plant)

6. End-of-shift

Sprockets on mast

Grease entire machine weekly

Examine machine while greasing

May be left at last hole

Depending on distance from wall/face

Shut compressor down

Relieve pressure on machine by closing solenoid

Pressure should drop to 40 psi

Turn compressor motor off

Inventory of supplies for next shift

End-of-shift report

7. Transporting drill

Lower and secure mast

Stack hose on compressor

Place hose from rear of compressor in a zig-zag, side-by-side pattern

Each loop of hose will hang off each side of compressor

Secure with bungee cords

Connect compressor to the drill

May need to use swivel adjustment to connect

Clean work area

If necesary to transport by truck

Clean down machine

Check/clear/level area prior to moving

Start compressor up

Use controls while walking along side of drill

Use mast as counter-weight

Use boom to assist with drill balance

Keep tracks at same speed

Operator needs to stay clear of tracks

Avoid wearing loose clothing

Avoid pinch-points

Between drill and compressor

Level/plumb mast

Extend boom 2-3' to hole marking

Lift front of tracks to apply downward pressure to mast

15' or less to wall

Wear fall protection

Drill first row of holes 20' from wall

Use these drill holes for tie off

Lower drill bit and rod to ground

Ensure first rod is always clamped down

Engage and lock centralizer

Turn on rotation

Slightly open water valve

Start lowering hammer

Once you being drilling, turn on the air

Apply necessary pressure for hammer to go down

Overpressure - will lift the mast (rotation very slow, may lockup)

Underpressure - will cause rods and hammer to separate

Striking bar should go 2-3" inside hammer at all times

Leave water on for first 10' when it is solid

Drill until coupling is about 2" from contacting the centralizer

Examine hole for possible voidance

Re-line hole with cuttings

Up to 30' depth only

Ensure 10' are good

Leave clamps on

Turn off rotation

Turn on hammer and air to separate the striking bar from the coupling

Raise hammer all the way up

Place grease on coupling end

Remove rod from rack

Place new rod on top of other one

Align rod with striking bar and hammer

Lower hammer slowly and turn on rotation (slowly)

Rotation should always be counter-clockwise

Once striking bar grabs coupling of new rod, release

Ensure the two rods are connected

Observe both top and bottom couplings at same time

If you have to physically touch the rods, make sure rotation is in neutral

Raise both rods up all the way to make sure hole is done right, clear of obstruction, etc

Open centralizer

Turn on rotation, hammer and air

Slowly lower the hammer

Once drilling begins, reset rod pressure

Drill until you can grab the other rod and slide it over and place it on existing rod

Repeat process until desired depth is reached

Remember to ensure hole is clear for each additional rod

Drill an additional 5' from the face height

Put rods all the way down

Give it some pressure

Turn on hammer and air to break rods

Listen for clicking sound

Indicates rods are loose

Begin picking up rods and lower centralizer

Once rods are up to couplings

Bottom of coupling must sit on top of centralizer

Put rotation on reverse and slowly raise hammer to begin unscrewing

Once unscrewed, lift the hammer all the way up the mast

Manually unscrew rods and place on rack

Repeat process until you reach last rod

On last rod, place lock on centralizer

Tension drill bit to centralizer

Measure hole depth

Retract the boom about a foot which will drag back the mast and prevent material from falling back into the hole

Don't fight the machine

Cover/plug all holes

Cone-shaped plugs

Title

Driller

Subject

-

Company

-

Author

debbie combs

Version

27

Comments

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