More than 60 years of experience

Inženjerski projektni zavod d.d.
Prilaz baruna Filipovića 21, 10000 Zagreb
Phone: 00385 1 3717 300
Fax.: 00385 1 3717 309
E-mail: uprava@ipz.hr
www.ipz.hr
More than 60
years of experience
in infrastructure engineering design!
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// Company Profile
Inzenjerski projektni zavod is a company specialized in infrastructure
engineering design and has been active in this field for over 60 years now. The Government
of the Republic of Croatia has established IPZ in 1948 as a national company for development
of all kinds of designs for roads, road structures and water engineering facilities.
Actively participating in the reconstruction of the
country that has suffered huge destruction in
the war and in the modernization of the traffic
infrastructure in Croatia and in other countries of
the former Yugoslavia,
IPZ has over the period of sixty-two years
developed more than
7,200
studies,
conceptual designs, investment
programmes, preliminary, main
and capital investment designs,
expert opinions and other pieces of
technical documentation.
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05
// Company Profile
more than 50% or all roads and
motorways in the Republic of Croatia, as well as the
IPZ has designed
1993.
first motorway in the former Yugoslavia, several hundreds of
bridges, many tunnels, several dozens of engineering structures,
ranging from industrial plants to transformer stations, thousands
of kilometres of water supply and sewer systems, hundreds of
water tanks, etc.
Vrbovec
Sv. Helena
Gornja Ploča
Gračac
An important date in the development of IPZ is the year 1993,
when IPZ was privatized and transformed into a joint stock
company owned by the former and present employees. Almost
two decades of independent operation and growth in market
conditions on both Croatian and international markets have
confirmed the Company’s strength and vitality.
Motorways and national
roads in Croatia constructed
according to IPZ’s designs.
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// Company Profile
In terms of results, human resources, technical
equipment and implementation of cutting-edge
approaches and solutions in design and supervision,
IPZ is today a leading Croatian company for
infrastructure engineering design. Our team of
almost one hundred specialists, experts and other staff
members represents our main value and IPZ is able
to realize the most complex tasks in designing roads,
bridges and water engineering facilities.
17
Administrative
employees
6.000.000.00 €
4.000.000.00 €
43%
90%
11.831.464,78 €
Other
photocopier
attendants,
accounting,
administration
12.197.507,04 €
Draftsmen
6.395.049,58 €
Civil
Technicians
11.131.172,22 €
8.000.000.00 €
11.948.054,27 €
10.506.184,98 €
10.000.000.00 €
12.306.366,15 €
10
10.918.237,74 €
16
13.520.352,80 €
12.000.000.00 €
Graduate
Engineers
Production
employees
2000-2009 Annual
Revenues Review 14.000.000.00 €
6.587.320,85 €
EMPLOYEES
INCOME
51
2.000.000.00 €
Certified
Engineers
Engineersin-training
2009
2008
2007
2006
2005
2004
2003
2002
10%
2001
0.00 €
2000
8%
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// Company Profile
TECHNICIAN
CERTIFIED DESIGN
ENGINEER
TECHNICIAN
HEAD OF ROAD
DEPARTMENT C-1
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
HEAD OF ROAD
DEPARTMENT C-2
MEMBER OF BOARD
OF DIRECTORS
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
PRESIDENT OF BOARD
OF DIRECTORS
TECHNICIAN
ASSOCIATE
DESIGN ENGINEER
DRAFTSMAN
CERTIFIED DESIGN
ENGINEER
HEAD OF ROAD
DEPARTMENT C-3
DRAFTSMAN
TECHNICIAN
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
BOARD OF
DIRECTORS
DRAFTSMAN
TECHNICIAN
DRAFTSMAN
ASSOCIATE
DESIGN ENGINEER
ASSOCIATE
DESIGN ENGINEER
DRAFTSMAN
PARTNERS
ASSOCIATE
DESIGN ENGINEER
The organizational structure of our company is based on the
specialized departments, whose specialist know-how is best
manifested in teamwork and in the cooperation both within the
company and with other companies. The solutions we in IPZ
offer to our clients are based on our own experience and knowhow and on the cooperation with our strategic partners and are
therefore able to deliver complete and comprehensive designs.
CERTIFIED DESIGN
ENGINEER
TECHNICIAN
CERTIFIED DESIGN
ENGINEER
MEMBER OF BOARD
OF DIRECTORS
HEAD OF BRIDGE
DEPARTMENT M-2
CERTIFIED DESIGN
ENGINEER
DRAFTSMAN
CERTIFIED DESIGN
ENGINEER
TECHNICIAN
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
ORGANIZATION
As an integral design unity
we are organized in nine
departments, as follows:
Three departments for road
design
CERTIFIED DESIGN
ENGINEER
HEAD OF BRIDGE
DEPARTMENT M-3
HEAD OF URBAN
TRAFFIC DEPARTMENT
Traffic signalling
and road furniture designs.
In our work we are using the state-of-the-art equipment and software: for road design we use Plateia,
CARD/1 and Vestra software and AutoCAD Civil3D tool for interactive modelling. Noise protection
on the roads is designed in the SoundPLAN software. For design of water engineering facilities we use
Hydra, Canalis, Aquaterra and WaterCAD programmes. For structural engineering we use structural
analysis tools Sofistik, RM Bridge V8i, Allplan and SCIA. For reinforcement calculation and drawings
we use ArmCAD and ArmCAD 2000.
DRAFTSMAN
TECHNICIAN
CERTIFIED DESIGN
ENGINEER
TECHNICIAN
DRAFTSMAN
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
TECHNICIAN
HEAD OF WATER
ENGINEERING
DEPARTMENT V-1
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
DRAFTSMAN
TECHNICIAN
One department for urban
roads and
One department for general,
administrative and technical
services.
Designs of electric power supply,
illumination and all electrical
and TC installations.
ASSOCIATE
DESIGN ENGINEER
CERTIFIED DESIGN
ENGINEER
CERTIFIED DESIGN
ENGINEER
Two departments for bridge
and engineering structures
design
Two departments for water
engineering facilities
CERTIFIED DESIGN
ENGINEER
Topographic survey
and land acquisition studies.
CERTIFIED DESIGN
ENGINEER
HEAD OF WATER
ENGINEERING
DEPARTMENT V-2
GENERAL,
ADMINISTRATIVE AND
TECHNICAL SERVICES
CERTIFIED DESIGN
ENGINEER
ASSOCIATE
DESIGN ENGINEER
TECHNICIAN
CERTIFIED DESIGN
ENGINEER
DRAFTSMAN
ASSOCIATE
DESIGN ENGINEER
SOFISTIC Software
ACCOUNTING
HUMAN
RESOURCES
TECHNICAL
SERVICES
MAINTENANCE
RECORDS
OFFICE
RM Bridge V8i Software
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// Company Profile
REDUCTION OF WIND SPEED BEHIND THE WINDBREAK
CORPORATE PRINCIPLES
The main guideline in IPZ’s business policy is to deliver
economically and technically most efficient solutions at each
level of client’s investment into respective projects. Such an
approach can be applied only in highly professional working
environment, with an encouraging working climate and strict
quality compliance system.
The management system in IPZ has
been harmonized with the provisions
of management standards
ISO 9001:2008.
ENVIRONMENTAL PROTECTION
Our quality system ensures a high quality of our work and harmonization of our
activities and results with clients’ wishes and needs. In the elaboration of optimal
economic and technical solutions special attention is paid to environmental
issues. In this way IPZ is integrating all processes into coordinated results/designs
aimed at meeting client’s needs both in terms of the quality of our services and
of the impact of our solutions on the environment.
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// Company Profile
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OPERATIVE AND STRATEGIC MANAGEMENT
The shallow management structure of IPZ enables quick decision-making and
flexible approach to work. The Management Board members are directors who
are in direct contact with clients and have first-hand knowledge of clients’ needs.
In the cooperation with department managers/team leaders they ensure that the
wishes and needs of our clients are respected and met optimally.
Shareholders through their representatives in the Supervisory Board
make the decisions on the strategic development of the company.
SUPERVISORY BOARD
BOARD OF
DIRECTORS
Chairman
Josip Sekopet
Member
Dragutin ©poljar
Member
Damir Gracin
Member
Stjepan ©torga
Member
Ivan Dumbović
President of the Board of Directors
Mario Erdelji
Member and Head
of Road Department C-3
Irena Kršinić
Member and Head
of Construction Department M-2
Zoran Lončarec
IPZ has a rich experience in working with international partners and has both the
required quality and the strength for international markets. We in IPZ are confident
that in cooperation with strategic partner we can confirm our ability to perform
the work we are entrusted with in line with the highest professional standards and
client’s requests regarding deadlines and commercial terms.
In short: IPZ has tradition, know-how, professional
skills and state-of-the-art equipment, as well as ability
and need to cooperate with high quality partners.
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// Company Profile
IPZ’s business activity mostly includes civil infrastructure engineering:
ROADS
Motorways
National roads and lower rank roads
Intersections
Toll Stations
- Interregional intersections of two
motorways or express roads
Closed Toll System
- Trumpet interchanges - Motorway entrance/exit
- On intersections
- Frontal
A5_Intersection Sredanci of roads A3 and A5
A1_Stretch of the Motorway around the City of Otočac
A6_Approach to the Tunnel Čardak
A3_Detail of the road through the region of Slavonia
A6_Intersection Bosiljevo of roads A1 and A6 in hilly terrain
A2_Intersection Krapina
A2_COKP (Roadside Maintenance and Traffic Control Centre) Krapina
A3_Toll station in Intersection Županja
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// Company Profile
Tunnels
Roadside Service Facilities
- Tunnels in unfavourable materials (pipe roof)
- Roadside rest areas including
various facilities (gas station, car park,
restaurant, motel)
- Tunnels in stone material
Roadside Maintenance
and Traffic Control Centre
- Winter maintenance service
- Remote traffic control
Tunnels designed by IPZ show the highest safety
level in Europe and have been recognized as such:
In 2005 the Plasina Tunnel was classified as one of the safest in
Europe according to ADAC requirements
In 2009 the Tuhobić Tunnel was classified as second best in
Europe according to EUROTRAP (European Commission Programme)
A1_Roadside Maintenance and Traffic Control Centre ©ibenik
A1_Tunnel Plasina
A3_Tunnel Levačica
A6_Tunnel Vrata
A1_Roadside rest area Dobra
A3_Roadside rest area Spačva
A2_Roadside Maintenance and Traffic Control Centre Varaždin
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// Company Profile
URBAN
ROADS
In order to avoid traffic jams in cramped spaces
of dense development, urban roads must be
constructed as grade separated facilities with
specific shapes of span structures.
BRIDGES AND VIADUCTS
The brief review of designed structures includes only major and
important recent facilities. It is therefore that hundreds of culverts of
underpasses, overpasses and minor bridges constructed in the road
network of the Republic of Croatia were not included here. Our selection
shows the development and acceptance of new technologies, aimed
at reduction of construction and maintenance costs and at increased
durability of structures, all in compliance with stricter EU regulations.
Most Mladosti bridge in Zagreb
Zagreb_Intersection Držićeva ulica/ Slavonska avenija
Zagreb_Intersection Radnička cesta/ Slavonska avenija
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// Company Profile
Steel Girder bridges
Steel Bridges and Viaducts
The following pages show photographs of various systems of steel bridges.
Steel Arch bridges
Maslenica Bridge
Viaduct Limska Draga
Bridge over the Krka river at Skradin
Gacka Bridge
Most Slobode bridge in Zagreb
Viaduct Dubračina in Crikvenica
The bridge over the Sava River in Zagreb
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// Company Profile
Bridges and Viaducts of Reinforced Concrete
DEVELOPMENT OF PREFABRICATED
BRIDGE SUPERSTRUCTURES
The progress of construction technology is best shown in the review of bridges and viaducts of standard
span lengths constructed of reinforced concrete - this can be observed primarily in the development of
superstructure cross section, but also in the changes of the longitudinal disposition of the facility.
PREFABRICATED BRIDGE SUPERSTRUCTURES
Development of cross section
Up until a few years ago almost all bridges and viaducts
with standard span lengths in the motorway route were
prefabricated bridge superstructures.
Depending on the soil type their foundation was either
shallow or drilled piles. The substructure is mostly entirely
monolithic (only pier heads were sometimes constructed
as semi-prefabricated). Bridge superstructures were
always realized of prefabricated prestressed girders of
reinforced concrete that were mostly erected by launching
truss, rarely by cranes. The length of prefabricated girders
ranged from 25 m to 40 m and span lengths of individual
fields of such structures corresponded to the length of
prefabricated girders. Span lengths of individual fields
exceeding 50 m were reached only rarely, by construction
of cantilever overhangs on pier heads, into which the
prefabricated girders were subsequently inserted.
Initially only girders with I-shaped cross sections were
used. Following the erection they were connected in the
cross direction by in situ execution of joints in the upper
chord level of prefabricated girders. The durability and
the transversal rigidity of the integral superstructure
constructed by such cross-connecting of prefabricated
girders was insufficient. Transversal rigidity may be
improved by subsequent implementation of rigid cross
girders, but this design of structures was abandoned due
to the fact that the durability of this type of connection is
not satisfactory.
A significant improvement of durability has been achieved by
construction of 20 - 25 cm thick slab of reinforced concrete above
the upper girder surface. The result was that the durability of
the superstructure of prefabricated girders became closer to the
durability of the monolithic superstructure. In instances where
prefabricated girders were used whose chords were not touching
after assembly, soft supported reinforced-concrete sacrifice
formwork was used. Further development resulted in the advent
of wide flange prefabricated I-girders whose upper chords were
touching after the assembly, so that no formwork is necessary
for concreting of the deck slab.
The most recent guidelines exclude the formerly most commonly
used I-girders and instead include the rarely used passable box
girders and mostly used prefabricated T-girders.
Development of longitudinal
disposition
Individual fields of the so constructed superstructures were
usually connected in longitudinal direction by continuity slabs
providing continuity without expansion joints along the entire
structure, even on structures with length exceeding 500 m.
Continuity slabs provide driving comfort; they transmit horizontal
forces, but do not transmit moments from one field to another.
In terms of statics, such structures are composed of a series of
simple grid structures. Through further development continuity
slabs evolved into a strong transverse bond, whereby the entire
superstructure became a continuous girder of a series of grid
structures.
Viaducts Osojnik and Severinske Drage
Viaduct Stara Sušica
Limitations of the application of
prefabricated girders
The above-described development resulted in significantly improved
durability. Limitation factors of this technology are span lengths of
individual fields – they are limited to maximally ca 40 m. Construction
of larger spans is too expensive and thus not acceptable. In view
of the increased labour price even the realization of standard span
lengths becomes expensive due to the large share of labour price in
the overall price of structures.
Bridge Dobra
Viaduct Golubinjak
Viaduct Vršci and tunnel Plasina
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// Company Profile
MONOLITHIC SUPERSTRUCTURES
EXAMPLES OF
INCREMENTAL LAUNCHING
EXAMPLES OF LONGITUDINAL DISPOSITION
MONOLITHIC
SUPERSTRUCTURES
The decreased share of price of human labour in the overall
price of the structure is a result of modern technologies
for construction of monolithic superstructures, in the first
line the incremental launching method and construction
on self-supporting floating scaffold. Considering the fact
that the prices of the equipment for the above construction
methods have dropped significantly, the construction of
monolithic superstructures is able to compete with the
technology of prefabricated girders. Our designs including
construction on self-supporting floating scaffold were not
realized; however, the incremental launching method was
applied in the construction of many long and high bridges
and viaducts.
Incremental Launching Technology
Structures with span lengths ranging from 30 m to 50 m, their
overall length ranging from 300 m to as much as 940 m and their
construction was even less expensive then the construction with
prefabricated elements would be. As a rule, the cost effectiveness
of structures constructed by incremental launching method
increases with increasing span lengths, whereby the spans of 50
m are standard and economical. The expense of procuring steel
nose, launching presses and braking system is soon recovered
through lower cost of construction. Structures realized by this
method are exceptionally durable and the closed box beneath
the deck slab is favourable in case of frost.
Viaduct Most Bajer
Viaduct Hreljin
Viaduct Rašćane
Viaduct Zečeve Drage
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// Company Profile
Designs under development
and tender documents
01.
Incremental launching method for composite superstructure
02.
Double composite superstructure of the bridge over the river
Sava on the corridor VC
Main design of composite structure has been designed that included incremental launching
of the steel structure and subsequent construction of concrete deck slab on the floating
scaffold for a viaduct with individual span lengths of 62.5 m and overall length of more than
900 m. This design has not yet been realized.
Elaboration of the
conceptual design
of the bridge over the
Sava river at Jarun Lake
Main design of the continuous double composite girder bridge over the river Sava on the
European corridor VC has been completed. Procedure for obtaining building permit is
underway. The overall length of the bridge is 660 m and the main span is 130 m.
03.
04.
05.
Cross section and longitudinal section of the bridge over the Sava river at Svilaj, on the European Corridor VC.
Elaboration of the conceptual
design of the bridge over the
Sava river at Bundek Lake
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// Company Profile
WATER ENGINEERING FACILITIES
WATER SUPPLY SYSTEMS
Intakes and water plants
Potable water conditioning plants
Water tanks
Regional and interregional
water supply systems
Water supply networks and pipelines
Submarine pipelines
Control room
Pumping station intake
Portable water treatment plant 1,0 m3/s
Submarine pipeline
Sedimentation tank
Water tank
Laying Pipe
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// Company Profile
WATER ENGINEERING FACILITIES
WASTEWATER DISPOSAL
AND RAINWATER
DRAINAGE SYSTEMS
Urban sewage disposal systems
Sewage collection facilities
Pumping stations and
pressure pipelines
Wastewater Treatment Plants
Offshore Outfalls
Wastewater treatment plant ES 1 200 000
Watercourse regulation along the motor way route
Treatment of rain water from the motor way
Sea coast improvement
Construction of collector