Atlas Copco SECOROC COP 54QHD Handbuch - Seite 5

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1. Technical Data

Preparing to drill

Hose connection

Connecting and securing the air hoses.

For a compressed air system to be efﬁ cient, reliable and economic,

there must be:

sufﬁ cient compressed-air

capacity (volume and pressure);

minimal pressure loss

between the compressor and

the hammer;

minimal air leakage between

couplings.

This can be realized by ensuring

that:

the correct size of compres-

sor is selected;

the correct hose size is used

between the compressor and

the hammer;

there is no leakage in hose

connections between the com-

pressor and hammer.

DANGER

Compressed-air hoses between the compressor and the drill rig

must be secured by means of an external or internal safety wire, which

must be fastened safely to the drill rig. If the DTH hammer is to work

at pressures above 10 bar (145 psi), any local regulations regarding air

hoses and couplings must be strictly observed.

Always check that hoses, hose nipples and hose clamps are not

damaged, and that they are properly tightened and secured.

CAUTION

Always check the condition of drill string components. Bent or worn

pipes can cause damage and excessive wear to the hammer and rig.

Setting-up the rig

Before drilling with the DTH hammer, the rig must be set-up correctly

in order to give stability and safety. If this is not done, the effects of

feed force and rotation torque can cause the rig to move. This will have

a negative effect on drilling, especially when

drilling deep, straight holes.

When setting up a drill wagon or crawler

drill rig, a stable three-point set-up must be

obtained, with the weight of the rig distributed

between the base of the feed beam and the

two rear corners of the rig. It is of the utmost

importance that the rear loading points are

as far to the rear of the rig as possible, with

most of the rig weight being loaded on to the

base of the feed.

When drilling in soil or other non-consoli-

dated formations, the weight of the rig must

not be loaded on to the feed near the mouth

of the hole, since this could easily cause the

hole to cave-in. Instead, the load should be

distributed some distance to either side of

the hole. Suitable support can be obtained

by placing a sturdy U-beam under the base

of the feed beam, and supporting the beam

on planks at both ends. A two inch (50

mm) plank should then be placed inside the

U-beam to prevent mechanical chatter and

damage to the base of the feed beam.

If the rig is wheel-bound, it should be raised off the ground completely

using the jacks, so that all wheels are clear of the ground.

DANGER

The rig must be set-up correctly in order to give stability and safety.

If this is not done, the effects of feed force and rotation torque can cause

the rig to move or even to overturn. This can incur the risk of serious or

fatal injury as well as damage to the drill rig and equipment.

WARNING

Heavy lift. Take care when handling the hammer.

The hammer and its internal components are heavy and difﬁ cult

to handle, especially in the case of the larger hammers.

When lifting using mechanical

lifting equipment, sling the

hammer as shown in the ﬁ g.

Alternatively, a lifting-eye cou-

pling can be screwed on to the

top sub.

Transportation. Do not let

the hammer lie unsecured on a vehicle or drill rig. Al ways secure the

hammer for transportation.

WARNING

Always wear goggles during drilling!

The exhaust air from the hammer (and also from the top sub if a

unit for extra ﬂ ushing is ﬁ tted) has a very high velocity. Objects such as

small stones, drill cuttings, sand, earth and oil residue that are entrained

in the ﬂ ushing air can cause serious injury to unprotected eyes. Pay

special attention to this danger during collaring, when a top sub with

extra ﬂ ushing is in use, and when the hammer is fed through the drill

steel support or down into the hole.

Drilling

Rotation to the right

DTH hammers must be rotated to the RIGHT (clock wise) during drill-

ing, since the driver chuck and top sub are threaded into the cylinder

with RIGHT-HAND THREADS.

Rotation must always be to the right when the hammer is operating.

Left-hand rotation (or no rotation) will cause the driver chuck to loosen,

which could mean losing the drill bit (or even the entire hammer) down

the hole.

The drill string should be rotated to the right

even when the hammer is not operating. For

example, this should be done when cleaning

the drill hole and when lifting up the drill

string. It can be said that rotation to the

right should be switched on as long as

other operations are in progress with the

hammer in the hole. The risk of the drill bit

working loose should also be considered

when breaking the joints between drill pipes.

When adjusting the breaking wrenches,

bear in mind that the drill string must not

be rotated anti-clockwise any more than is

absolutely necessary.

IMPORTANT!

Always switch on rotation to the right before starting the feed or

hammer.

Let the hammer rotate to the right (clockwise) even during lifting or

lowering of the hammer.

Do not switch off rotation to the right until all other functions have

been switched off.

WARNING

Take great care when jointing drill pipes. Make sure there is no danger

of your ﬁ ngers being pinched or clothing being entangled when the drill

string is rotated.

When a pipe wrench is used during jointing, there is a risk of the

wrench ﬂ ying off and causing injury when rotation is applied.