2005 - Putzmeister

Refurbishment
Not as easy as you think –
Diamant Mühle Hamburg refurbishment
Sometimes its not all that easy to deliver
concrete to where it is needed. For the
refurbishment of the nearly 70 year old
Diamant mill in Hamburg-Wilhelmsburg,
the concrete first had to cover a distance
of about 110 m, for example, before arriving
at the sliding formwork. This was a
real challenge for the team from TBG
Pumpendienst Nord GmbH from Bad
Oldesloe, which relied on a Putzmeister
SANIMA concrete pump and a high
pressure delivery line.
As part of the refurbishment of the
Diamant mill, the 15 silos were concreted
inside the building between February and
September 2005. For each job, the sliding
formworks in three silo cells were each
continuously fed with concrete for approximately
80 to 90 hours. For each of the five
construction sections in total, approximately
300 m 3 of concrete was used. The relatively
long delivery distance and the tight
time frame, which was prescribed by the
stroke speed of the sliding structure, made
particular demands on the concrete. On the
one hand, the material had to be easily
pumpable, and on the other hand, it had to
set quickly. As the concreting work was
carried out both in winter and in the warm
summer months, the concrete supplier
ROBA also adapted the concrete mixture to
the season.
For easier feeding from truck mixers, the 20 m SANIMA boom is slightly raised. At this refurbishment site, the concrete is
delivered by a riser connected to the hopper (Photo: TBG Pumpendienst Nord)
The mill silos were refurbished under the
management of the construction company
WASSMANN + SÖHNE, Burgdorf.
Completion is planned for the end of
December 2005.
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SANIMA delivers direct to the riser
At this construction site, the distance to be
covered by the concrete before it reaches
the sliding formwork is not run of the mill.
This is because the total length of all three
lines to be fed with concrete was 230 m.
The concrete pump, a Putzmeister SANI-
MA 20.09 S, therefore not only used the
delivery line on the boom, but also pumped
the ready-mixed concrete directly from the
hopper to a connected riser. "We specifically
adapted this delivery line", said Thomas
Göllner, managing director of TBG
Pumpendienst Nord GmbH, "for this property
and mounted it on the exterior walls
of the silo building to be refurbished."
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The vertical delivery line was carefully mounted on the wall
(Photo: TBG Pumpendienst Nord)
usually already fully equipped with these
additional hoses and pipelines in special
magazines. Several variants can be selected
in the stowage compartments, for example,
TBG-Betonpumpendienst Nord's SANIMA
has up to 150 m of DN 65 hose on board.
A further typical use is illustrated by the
refurbishment works at the Hamburg
Diamant mill.
Here, TBG Betonpumpendienst Nord benefits
from the characteristic advantages of
SANIMA. For example, the compact truckmounted
concrete pump contents itself
with a minimum support extent of just
3.9 m to the front and a support extent of
2.3 m to the rear, meaning it remains within
the vehicle dimensions. In addition, the
machine has an efficient pump aggregate,
which is designed for a concrete pressure
Refurbishment
of up to 112 bar (maximum/theoretical).
The SANIMA is therefore also equipped
for larger delivery distances.
125 mm delivery line reduced to 65 mm
The connected delivery line is a Putzmeister
ZX high pressure line, which can withstand
a concrete pressure of 250 bar. The concrete
was initially pumped 30 m high on the external
wall and then delivered approximately
30 to 40 m to the silo roof. At the end
of the now horizontal line, TBG employees
had fitted a flexible delivery hose, which
was manually switched to one of the three
downpipes leading to the silo cells (length
approximately 30 m each), according to
requirements. Over the entire distance, the
cross section of the delivery line was reduced
from DN 125 to just DN 65. The
riser could easily be closed via a mechanical
guillotine in the pipeline at ground level.
Thomas Göllner said, "This multiple tapering
of the line diameter was a particular
challenge for us, as there was a risk of concrete
jams especially at the tapering points,
and this was to be avoided at all costs in a
line of this length!"
The construction process required close
cooperation by all those involved. For within
each construction section, all processes
had to smoothly mesh within a defined
period of time. For TBG Pumpendienst
Nord, this construction site is also an
example of how specialists can collaborate
to successfully solve a technically
challenging task.
We would like to thank TBG
Betonpumpendienst Nord and Heidelberg
Cement for their support.
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PM 3723 GB
The SANIMA 20.09 S allows extremely
flexible work, especially in refurbishment
projects. The machine, built on a 2-axis
chassis, has a 20 m high placing boom with
three arm segments in a "Z" fold, whose
working range is often sufficient in smaller
construction sites. If the use of a larger
truck-mounted concrete pump is required
but not possible due to the limited footprint,
the 20 m SANIMA boom can also be
used as a pipe bridge and the missing reach
is compensated for with connected pipelines
or delivery hoses. The SANIMA is
This SANIMA 20.09 S has a 150 m delivery hose
(DN 65) on board
The ZX high pressure line is supported with timber blocks in the area of the guillotine
(Photo: TBG Pumpendienst Nord)
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PM 3723 GB