Schwing 30100750, Руководство по эксплуатации

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Operation
All S P Rock Valve Model s
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Operation Manual -
81
Lubricate your pipeline.
Once the ready mix truck(s) arrive on the job, you can
lubricate your pipeline. Schwing highly recommends
that you pre-lubricate the separately laid pipeline each
time you must pump into dry pipe. In some parts of the
United States and Canada, the concrete is so rich with
cement fines that operators do not pre-lubricate to
begin pumping operations. This practice is NOT
recommended. The amount of time saved by not
pre-lubricating cannot begin to make up for the hassle
of having to remove pipe sections from a separately
laid pipeline. Most importantly, the blockages caused
by failure to lubricate can be dangerous (see the section
on blockages in the Safety Manual section of this
Operation Manual).
There are commercially available products that will
lubricate a pipeline with much less volume (meaning
much less weight) than portland cement and water.
These products usually come in sandwich sized plastic
bags, and lubricate about 100 feet of 5" pipe per bag.
Instructions for mixing vary by the different
manufacturers. These products are less expensive than
portland cement, and do not set like cement. If you use
these products, pay close attention to the instructions
and warnings on the package.
If you only have portland cement for lubricating your
pipeline, you will have to wrestle with the weight.
Choose one of the methods shown below, based on the
job situation. Before you begin to mix the slurry, put on
your breathing mask and the rest of your personal
protection equipment.
If you have help in the form of a laborer assigned to
work at the pump, or an oiler or other handy guy, you
can mix the best slurry in a barrel. By mixing it on the
ground in a barrel, you can get good consistency and
break up clumps of cement that tend to form, not unlike
lumps in mashed potatoes. However, this method has
the disadvantage of having to lift the barrel and pour
the slurry into the hopper, which is why you will need
help. To use this method, lay a sack of portland on top
of the barrel which has been filled with about 25
gallons of water. Take a shovel and break open the sack
with the blade, allowing the cement to fall into the
barrel. When the bag is empty, set it off to the side and
mix the cement and water with the shovel blade. Break
up any cement clumps that are encountered and
continue mixing until the mixture is smooth and
creamy. Get your helper and pour the mixture into the
hopper. It will not cover the openings to the material
cylinders, but for now, don’t worry about it. Make one
barrel of mix for each 100 feet of laid pipeline that the
concrete will see, but if you will be going through more
than 200 feet of pipe, you, your boss, or the concrete
superintendent on the job site should have arranged to
have a grout mixture brought to you by the ready mix
plant. Unless you have at least a half a yard of slurry
delivered to the pump, do not try to pump this mix yet.
Using the barrel method, you can add a little sand, if
needed, to stretch the amount of slurry mixed. This
would be helpful if you have to pump through 300 feet
of line, but only have 2 sacks of cement available.
If you are alone at the pump, you will not be able to lift
the barrel to pour the slurry into the hopper (it will
weigh 250 to 300 pounds...not many people would be
able to lift it alone). In this case, lay the sack of cement
on the hopper grate, and break it open.
NOTE!
Do not st a n d on the ho pp er g r a te for this, or
a ny other, p roce du re. The “NO POINT
R ULE” app lies to the ho pp er g r a te.
Get a water hose and direct the spray into the hopper,
aiming at the edge of the pile of cement. This will wash
the cement into the bottom of the valve housing,
mixing as you go. Try to break up clumps of cement
with the spray, but do not put your hands or any other
body part into the hopper. Mix more slurry as needed
for the length of the pipeline, as described above.
When the cement has all been washed to the bottom,
you can cycle the rock valve back and forth a few times
to agitate the mix a little more. Do not try to pump this
mix until you can back it up with concrete
immediately.
NOTE!
W hen initi a lly st a rtin g the pu m p , or when
rest a rtin g for a ny re a son, p ersonnel sho u l d
st a y a re a son a ble a n d p r ud ent d ist a nce
beyon d the re a ch of the d isch a r g e hose u ntil
the concrete r u ns ste ad ily a n d the line is free
of com p resse d a ir. Air will be in the line
when first st a rtin g , rest a rtin g , or a fter the
line h a s been t a ken apa rt or o p ene d for a ny
re a son. Com p resse d a ir c a n c au se the hose
to whi p v iolently. F or more d et a ile d
inform a tion see the Safety Manual .
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