2005 - Putzmeister

Technology
Flexible 20 m "quad" – Universal
truck-mounted concrete pump with
an unfolding height of just 3.9 m
With its new M 20-4 ZR model,
Putzmeister AG has extended its range of
compact truck-mounted concrete pumps
which can be used even in the narrowest
of spaces. What is particularly noticeable
about the machine is the boom which is
folded four times according to the "Z roll
and fold" principle. Previously, this boom
folding type was only used on larger
truck-mounted concrete pumps, e.g. for
the type M 24-4 ZR.
It is easy to tell which concreting tasks the
new M 20-4 "Z roll and fold" was designed
for, with its boom folding principle and
low truck height. Primarily, it is intended
for construction sites which could not previously
be operated with standard truckmounted
concrete pumps. For example,
narrow back yards in residential and
industrial areas as well as rooms that are
lower than 4 m high. The sites in question
also include construction and refurbishment
projects in low buildings, tunnels or underpasses.
Of course, normal construction
sites can also be operated with the folding
boom. For in concreting work in high construction,
the 20 m boom is excellently suitable
as a pipe bridge which – practically
without any loss in vertical reach – can
snake horizontally up to the 6th storey
(usual floor height approximately 2.7 m)
and be fed through windows or other opening,
even the smallest of brickwork openings.
The unfolding height of the new "quad"
M 20 ZR is just 3.9 m. In addition to the
specially developed placing boom, the
newly designed base structure also takes
into account the latest findings from
weight-optimised steel construction. With a
front support extent of just 3.2 m (rear within
the vehicle width of 2.5 m), the compact
truck-mounted concrete pump can be supported
and unfolded in even the narrowest
of passageways. In short – the space required
to support the M 20-4 is not greater than
the area that the machine takes up when the
driver's door is open.
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"Quintuplet" adapts itself
A large boom pump with a particularly flexible
placing boom was required in the carcass
of the new EL CORTES INGLES
shopping centre in Spanish Castellón. A
wide and deep bottom plate with five basement
floors also had to be concreted, in
addition to the long underground parking
access and the spacious floor areas. Due to
the narrow space conditions around the Old
Town, the position for setting up the
machine had to be considered in great
detail. The contract for placing the concrete
was awarded to the GRUPO TELEBOM-
BEO pump service provider, which used a
new Putzmeister BSF 52.16 H for many
weeks at this construction site.
Building construction
Our photo shows the machine during concrete
placement on the fifth storey after
machine operator Alfredo Muñoz had integrated
100 m 3 of concrete in the underground
parking area of the future shopping
centre a few hours previously. It is easy to
see how the boom of the M 52 "quintuplet"
can adapt to the building structure without
wasting any horizontal reach: first, the "A"
and "B" arms are used to reach the required
building height. Then the length of arms
"C", "D" and "E" is available as a horizontal
working range.
40
37
2,5 m
3,2 m
Our illustration clearly shows the narrow conditions
under which the M 20-4 placing boom can be used
(passageways, back yards, etc.).
The extremely flexible concrete boom has
a 125 mm delivery line as standard, in a
particularly hard-wearing, 2-layer design.
The core pump recommended by
Putzmeister is an aggregate with a 1,400 mm
stroke and 230 mm delivery cylinder Ø,
which is designed for delivery rates of up
to 90 m 3 /h or pump pressure up to 78 bar.
Delivery will begin in spring 2006.
The short wheelbase of just 4.5 m ensures
an extremely small turning circle. With a
permissible gross weight of less than
18 tons for the 2-axis chassis and an actual
tare weight of approximately 15 tons
(depending on the vehicle), the M 20-4
also has significant weight reserves. This
enables the small "quad" to carry additional
hoses and pipes, meaning that the working
range of the machine is significantly
extended.
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Horizontal reach 16.1 m
Vertical reach 19.5 m
Unfolding height
3.9 m
14
PM 3723 GB
15
PM 3723 GB