Appendix
Operation Manual -
SP 30590
revDate
operator to operate the unit as required by the
job circumstances. A spotter can be anyone who
is familiar with the safety rules for the pump and
workers and is equipped with a radio or knows
the appropriate hand signals. A spotter is needed
whenever the operator cannot safely see the
point of placement or the distance between the
unit and an unsafe area. See Also: Guide
Sucking Back
The act of putting the concrete pump into the
reverse mode for any of several reasons. Some
examples of reasons to suck back:
• To relieve pressure in the delivery system
before opening when a blockage has
occurred.
• To clean the boom with a sponge ball upon
completion of the pour.
• To remove concrete from the boom for the
purpose of folding the boom for moving.
Thrust Block
Also known as a “dead man.” This is a large block
of poured concrete, usually with one or more
sweep elbows cast inside, placed at the bottom
of a vertical run for the purpose of supporting the
weight of the vertical run and for lateral stabiliza-
tion of the pipeline. It stabilizes and supports the
vertical run by virtue of its enormous mass (nor-
mally one cubic yard or larger).
Towing Vehicle
In this manual, the term “towing vehicle” applies
only to trailer- mounted concrete pumps. It is the
vehicle you use to tow the trailer on the road, job-
site, or in the yard. The size and condition of the
towing vehicle are extremely important in these
applications. See the safety rules regarding this
subject in section 4 of this safety manual.
Transport Position
“Transport Position” refers to the position of the
boom during transport. For transport, the boom
is completely folded and lowered into the rests,
and the boom straps are secured. When stowing
in the traveling position because of a thunder-
storm, however, the boom straps need not be
secured if no travel is imminent.
Twin Circuit
The plumbing method used for the pumpkit in
which the differential cylinders are moved by the
main hydraulic pumps but the Rock Valve is
moved by the oil stored in an accumulator.
Unauthorized
Without authority, without permission. Examples:
Unauthorized operation of the boom could be
operation by a passing teenager. Unauthorized
repairs to the boom could be repairs made with-
out the manufacturer’s permission.
Unintentional Movement
Movement of the pump, boom, or related equip-
ment without a specific, intentional command by
the operator. An example of an unintentional
movement is if an operator fell while walking with
the remote control box and accidentally hit a joy-
stick, which caused a boom movement. Uninten-
tional movement can be avoided by disabling the
hydraulic system with the emergency stop
devices when the unit is not in immediate use.
Vertical Run
Sections of concrete delivery pipeline that run in
an up and down direction. Vertical runs have very
specific procedures and rules for installation,
support, cleaning, and inspection. Concrete
pumping personnel should, therefore, have spe-
cific training in these procedures and rules
before attempting to use them in a job setting.
Water Jet
The stream of water that comes out the end of a
water hose or pressure washer. The water jet is
the only part of the water system that needs to
go into the hopper, concrete valve, or waterbox
for cleaning.
Additional Reading Material
This is a partial list of the books that have been written
on the subject of concrete pumping. Omission of any
relevant books was done so unintentionally.
• Pumping Concrete and Concrete Pumps
, Karl
Ernst v. Eckardstein. F. W. Schwing GmbH,
1983.
• Pumping Concrete—T
echniques and Applica-
tions, Robert Allen Crepas. Aberdeen Group,
1991.
• Nomographs—A Guide to Usage
, Robert
Edwards. Schwing America, Inc., 1992.
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