Wirtgen Group technologies in construction of the

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29 Νοε 2013 (πριν από 3 χρόνια και 8 μήνες)

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Wirtgen Group technologies in construction of
the
Transylvanian
"Autostrada A3" motorway in
Romania

A3 infrastructure project to link Bucharest with Hungary

The c
onstruction of the A3


the Transylvanian
motorway


was given the green
light in 2004. Once completed, the A3 will link Bucharest with the
Hungarian
border
over a stretch of 588
km, extending across

Romania.

The route

stretches from Bucharest via Ploieşti, Braşov, Sighişoara,
Târgu Mureş,
Cluj
-
Napoca, Zalau and Oradea to the Hungarian border
,

where it will ultimately
connect to the Hungarian M4 motorway. Completion is scheduled for 2017.

Wirtgen Group technologies for the Bucharest
-

Ploieşti segment

Contracts for the 62
-
km
se
ction

from Bucharest to Ploieşti were awarded in roughly
equal shares to two different consortiums: Impressa Pizzarotti / Tirrena Scavi for the
section from Bucharest
to

Moara Vlăsiei, and Spedition UMB /Pa&Co International /
Euroconstruct’98/Com
-
Axa for t
he Moara Vlăsiei
to

Ploieşti section.

Spedition UMB is a member of the UMB Group owned by Dorinel Umbrarescu


known as Romania's "Asphalt

King
"
.

A
s
the
general contractor,
it opted for

technological solutions
from

the Wirtgen Group for all construction p
hases, from the
foundation and soil stabilization,
paving
and compacting

of

asphalt, all the way to
constructing

the ad
joining
concrete elements
,

such as gutters and curbs. All told, 35
machines from the Wirtgen Group were used for construction of the A3,
as many as
twenty of which were used on the final segment from
the
48
th

to
the
62
nd

kilometre
.


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Experience from Tirschenreuth for the
foundation
: HCQ and Hammtronic

Six Hamm Type 3520 vibratory compactors, each weighing 20 t, were used for the
foundation. These compacted the soil in two groups of three
machines operating in
echelon
. The compactors w
ere equipped with HCQ compression

meters. These
check the degree of co
mpaction during the work and directly indicate any
corrections that may be necessary.

All compactors were also equipped with the Hammtronic microprocessor control
system. This smart technology optimizes machine functions, ensuring economical
use of consuma
bles, optim
um

compaction results and maximum safety. Hammtronic
monitors all engine and machine functions, in particular travel drive, vibration,
oscillation and engine speed. This boosted productivity while simultaneously
reducing fuel consumption by 30 t
o 40%.

And thanks to their VIO drums, some of the
compactors

were even able to switch
from vibration to oscillation at the press of a button without stopping.

Reliability
is
crucial for soil stabilization

Soil stabilization was
carried out
in
-
situ by a
machine
set comprising a
n

SW

16

TA
binding agent spreader, Wirtgen WR 2500

S recycler and Hamm 3518 compactor
with an operating weight of 18 t. In a first step, the
SW

16

TA
spreads the binding
agent in the exact quantity and composition specified accordin
g to the soil samples.


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Next, the Wirtgen WR 2500

S processes the soil with the binding agent to form a
homogeneous load
-
bearing mixture, together with cement and water from the
connected tanker. Mixing the binding agent into the soil reduces the soil's water
content,
improving i
ts
paving

properties
, compact
i
bility and load
-
bearing capacity.

Depending on local conditions, the machine set can stabilize soil with the addition of
2 to 5% binding agent across a width of 2.5 m and down to a maximum depth of
50

cm at a speed of up to 25

m/min.
Not only is the
Wirtgen WR 2500

S
equipped
with a

milling and mixing rotor
with
four milling speeds, but
it can also switch

between
the
up
-
cutting

and down
-
cutting

process
without the need for conversion,
allowing
precise control of the final granu
lated material.

The processed soil
wa
s then pre
-
compacted in two or three passes and the final
compaction stage subsequently
completed
by a Hamm 3518 vibratory compactor
with oscillation and the HCQ
system
.

The solution for optimal asphalt paving: Vögele pavers with NIVELTRONIC
Plus and Big
-
MultiPlex
S
ki

UMB Spedition used two Vögele pavers

for the asphalt paving work
: a Vögele Super
1900
-
2 with AB 600
-
2

TV screed with a pave width of 7.5 m
,

and a Vögele Supe
r
2100
-
2 equipped with the same screed, but extended to a maximum pave width of 9

m
.

The first asphalt layer w
as levelled with the aid
of Vögele Niveltronic Plus. This
automatic grade and slope control system allows the grade to be precisely
controlled ac
ross the entire
section
by tracking a specific reference. This ensures
that the specified
grade
is achieved with pin
-
point precision, regardless of the
sub
strate

level.


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A Big
-
MultiPlex
S
ki was also used for the additional layers. Virtual scanning with
thre
e ultrasonic sensors
meant that
it was not necessary
to set up
stringlines.
This
eliminated both the
need to constantly reposition
stringlines and problems resulting
from incorrect positioning choices.

Hamm compactors first choice for final compaction

Several Hamm GRW

15 rubber
-
wheeled rol
lers (operating weight 12 t
, maximum
weight 24 t)

and DV

90

VV oscillation

rollers with an operating weight of 9.6 t were
employed for the final compaction stage (from a minimum value of 85% to a final
value of 98%).

I
n addition to their standard equipment complement, the GRW

15s were also fitted
with isothermal
aprons

and
tyre
heating to prevent bitumen from sticking to the
machines.

A key fea
ture of the DV

90

VV oscillation

roller
with
the intelligent Hammtronic
mana
gement system
is the
electronic control system that infinitely adjusts the speed
and oscillation frequency to the surface being compacted. It also features a
panoramic cabin in which the seat and control cockpit can be automatically rotated
through 360°, e
nsuring that the operator can always sit facing the direction of travel.

The width of the surface compacted in one pass was increased from 1,680 mm to
2,990 mm by using two DV

90

VV driving in
echelon
.

SP

250


A Wirtgen all
-
rounder for concrete paving

To
create

the adjoining concrete elements (canals, gutters, curbs), UMB Spedition
used a proven all
-
rounder from the Wirtgen Group


a Wirtgen Type SP

250 slipform
paver with a multifunctional configuration and flexible application possibilities for all
job s
ite needs. This slipform paver can be operated with four or alternatively three

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crawler tracks in both offset and inset modes
,

with numerous moulds
in

fixed or
variable size
s
.

For
this application
, UMB Spedition adjusted the configuration so that
the SP

250
could lay down
both the
sand
base course and the concrete in the specified profile.
This resulted in a substantial increase in productivity

and a high
-
quality canal profile.

In order to install gutters in the motorway's central reservation and at
bri
dge ramps
,
UMB Spedition used a Wirtgen W

100

F wheeled milling machine with a milling
width of 1 m and a front
-
loading conveyor that milled out a canal 300 mm deep and
1,000 mm wide. Completion of the gutters was then handled by the SP

250, which
laid dow
n a sand
base course
and concrete
surface course
.

Upon completion, a maximum speed of 100 km/h will be permitted on the new two
-
lane A3.

--------

Photos:




Romania_A3
-
bild01_PR


Hamm 3520 vibratory compactors

with
HCQ compression

mete
r
s and
Hammtronic
compact the foundation of
the A3.



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Romania_A3_bild02_PR


In
-
situ soil stabilization by a machine set
comprising an SW

16

TA binding agent
spreader, Wirtgen WR

2500

S recycler
and Hamm 3518 compactor ensures the
requisite high load
-
bearing capacity of
the soil.




Romania_A3_bild03_PR


The ideal solution for optimal asphalt
paving: Vögele paver with
NIVELTRONIC Plus and Big
-
MultiPlex
S
ki ensures perfect surface
evenness
.




Romania_A3_bild04_PR


Wirtgen W

100

F wheeled milling
machine with a milling

width of 1 m and
a front
-
loading conveyor mills out a
canal 300 mm deep and 1,000 mm wide
for the gutters.




Romania_A3_bild05_PR


After placing the sand base course, the
SP

250 also lays down the concrete
layer in the profile in
offset

mode.

--------


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For further information, please contact:

Wirtgen Group


Press Relations

Reinhard
-
Wirtgen
-
Straße 2


53578 Windhagen


Germany


Phone: +49


26 45


1 31


0


Fax: +49


26 45


1 31


4 99


E
-
Mail:
presse@wirtgen.de

Internet: www.wirtgen
-
group.com