145
Appendix
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Spotter
A spotter is a person who stands at a vantage point
where he or she can see both the point of discharge
and the pump operator. The spotter uses two-way ra-
dios or hand signals to direct the operator to operate
the unit as required by the job circumstances. A spot-
ter can be anyone who is familiar with the safety rules
for the pump and workers and is equipped with a ra-
dio 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 com-
pletion of the pour
• to remove concrete from the boom for the pur-
pose 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 stabilization of the pipeline.
It stabilizes and supports the vertical run by virtue of
its enormous mass (normally one cubic yard or larg-
er).
Transport Position
“Transport Position” refers to the position of the boom
during transport. For transport, the boom is complete-
ly folded and lowered into the rests, and the boom
straps are secured. When stowing in the traveling po-
sition because of a thunderstorm, 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 dierential cylinders are moved by the main hy-
draulic pumps but the Rock Valve is moved by the oil
stored in an accumulator.
Unauthorized
Without authority, without permission. Examples: Un-
authorized operation of the boom could be operation
by a passing teenager. Unauthorized repairs to the
boom could be repairs made without the manufactur-
er’s permission.
Unintentional Movement
Movement of the pump, boom, or related equipment
without a specic, intentional command by the opera-
tor. An example of an unintentional movement is if an
operator fell while walking with the remote control box
and accidentally hit a joystick, which caused a boom
movement. Unintentional 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 spe-
cic procedures and rules for installation, support,
cleaning, and inspection. Concrete pumping person-
nel should, therefore, have specic 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 wa-
ter hose or pressure washer. The water jet is the only
part of the water system that needs to go into the hop-
per, 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—Techniques and Applications.
Robert Allen Crepas. Aberdeen Group, 1991.
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