Schwing SP 500 - Page 144

144
Appendix
SP 500 / 750-15 / 750-18 / 1000 / 1250 Operation Manual
Qualied Operator
An individual who meets all the following qualica-
tions:
• reached the age of 18
• is physically and mentally capable
• has been trained in the proper operation and
maintenance of the pump and placing boom, if
applicable
• has demonstrated his or her capabilities to the
hiring company with respect to the operation and
maintenance of the pump and placing boom
• can be expected to perform assigned duties in a
reliable manner
Qualied Personnel
A generic term used to describe people who are qual-
ied to do work in their area of application. For ex-
ample, having your boom repairs inspected by “qual-
ied personnel” before use refers to inspection by a
certied welder or certied welding inspector. Having
repairs to your hydraulic system done by “qualied
personnel” would refer to repairs made by qualied
workshop personnel.
Qualied Workshop Personnel
An individual who meets all of the following qualica-
tions:
• has reached the age of 18 years
• is physically and mentally capable
• has been trained in proper repair, mainte- nance,
and inspection procedures plus the pertinent safe-
ty rules for concrete pumps and related equipment
• has demonstrated their capabilities to their com-
pany with regard to the procedures and rules dis-
cussed above
• can be expected to perform assigned duties in a
reliable manner
Rock Jam
A specic type of blockage caused when the cement
and nes of the concrete are not present in su󰀩cient
quantity to fully coat the larger aggregates and the
walls of the delivery system. In these cases, the rock
(larger aggregates of the mix) form a wedge inside
the pipe. Resistance to movement then becomes
overpowering and the concrete stops. Increasing
pressure to try to remove the wedge only results
in forcing more of the nest particles past the rocks,
compounding the problem. In some cases, the wedge
can be broken up by alternately pumping in forward
and then reverse. See also: Blockage
Separate Pipeline
A pipeline, other than the placing boom pipeline, that
is laid between the concrete pump and the point of
discharge.
Shuto󰀨 Valve
In hydraulics: a valve with the ability to stop the ow
or pressure of hydraulic oil. Must be able to withstand
the maximum pressure of the hydraulic circuit that
it controls. In concrete: A manually or hydraulically
operated valve that prevents the ow of concrete in
either direction. Some concrete shuto󰀨 valves also
have the ability to divert the ow of concrete to a dif-
ferent pipeline (for example, to a discharge point for
cleanout). The shuto󰀨 valve must be able to withstand
the maximum pressure on the concrete of which the
pump is capable.
Soft Switch
A secondary hydraulic circuit added to twin- circuit
machines to account for the oil coming from the
main hydraulic pumps while the Rock Valve is being
switched by the oil from the accumulator.
Soil Pressure
The force per square area that is exerted on the
ground by the outrigger legs. The amount of pressure
that the soil will support varies with the composition
and compaction of the soil. To determine the stability
of the soil, see the chart in section 5.16 of this man-
ual.
Sponge Ball
A medium to hard, spherical sponge used to clean the
inside of delivery pipelines. See Also: Go Devil