Tesmec Presentation-Railway Equipment-ACIM ACIM-EN... · 2017. 1. 7. · 12/10/2010 Tesmec Presentation-RE-SY-ACIM-EN-Rev 02 4/20 The complete system is composed by: A. Traction Unit

Railway Equipment

ACIM – Advanced Catenary Installation Method

Systems & Technologies

2/20 Tesmec Presentation-RE-SY-ACIM-EN-Rev 02 12/10/2010

Index

ACIM - Advanced Catenary Installation Method

Phases of the catenary stringing

Advantages of ACIM


ACIM - Advanced Catenary Installation Method - is the

working system for stringing the conductors (ropes -

wires) of an overhead contact line for electrification of

railway infrastructure.

This method allows to carry out simultaneously and in the

shorter time possible all the working phases.

It is used both for the electrification of "new railway lines“

and for the "renewal of the catenary".

The Advanced Catenary Installation Method has been used

with success for over 25 years in Europe. During this

period the equipment have been designed and

manufactured to develop and improve this method, each

of them dedicated to a specific working phase.

ACIM represents the best available working system for

stringing the catenary at the final operating tension force.



The complete system is composed by:

A. Traction Unit (self propelled rail truck): it has the function to tow the Constant Tension

Stringing Wagon.

Tesmec Traction Unit can operate at constant speed controlled by a PLC system. This

provides the best working condition to the Constant Tension Stringing Wagon and to the

operators.

B. Flat wagon for goods transport

C. Self propelled wagon with (crane and) platform for cable droppers installation: it has

the function to apply the droppers between the conductor and the contact wire.

Tesmec unit can perform these operations easily due a flexible working platform.



D. Constant Tension Stringing Wagon (also bidirectional type): it has the function to

string with constant tension simultaneously all the cables of the lines at the same time.

The conductors should be strung according to the mechanical tensions indicated by the

manufacturers and with the maximum accuracy. The stringing system shall guarantee the

same individual stringing force applied to the conductors from the beginning to the end of

the operations without stressing the conductors.

Tesmec Constant Tension Stringing Wagon assures the highest tension accuracy even in

case of variation of towing direction, speed, air temperature and slope; world-class in case

of computerised automatic models.

E. Self propelled wagon with MAT and platform (advanced machine for cable

positioning): it is a specifically designed self propelled truck, that working in combination

with the Stringing Wagon, allows the stringing of the catenary on the cantilevers placed on

the poles. It has the function to easy positioning of the cable to the posts. Tesmec unit can

perform these operations easily due a flexible working platform and high performing MAT

system.

F. Multipurpose self propelled wagon equipped with developable working platform,

hydraulic derricks and line pantograph to perform electrical and dynamic final tests



The following drawing shows the system with a possible combination of equipment:

A - Traction Unit (self propelled rail truck)

D - Constant Tension Stringing Wagon

C - Self propelled wagon with (crane and) hydraulic platform

E - Self propelled wagon with MAT and hydraulic platform

Stringing a new catenary 25 kV with n.1 messenger wire and n.1 contact wire


Index



Advantages of ACIM


“Catenary stringing" consists in a series of operations

carried out in sequence, to install the contact line

ready to operate.

We take into consideration only the technical

operations, leaving out the civil works (excavations

and foundations); from the poles installation to the

catenary final test.

The operations can be grouped into 5 different phases

which are listed below:

1st phase - poles installation on basements previously built

2nd phase - cantilevers installation on poles

3rd phase - cable(s) stringing (messenger wires - contact wires)

4th phase - droppers installation

5th phase - catenary final test

Introduction


1st PHASE - POLES INSTALLATION 2nd PHASE - CANTILEVERS INSTALLATION ON

POLES

3rd PHASE - CABLE(S) STRINGING

4th PHASE - DROPPERS INSTALLATION 5th PHASE - CATENARY FINAL TEST

Phases layout


The 1st phase consists in poles installation on basements previously built.

It is carried out by a traction unit (self propelled rail truck - A) equipped with hydraulic crane

for the poles handling which are transported on a suitable flat wagon (B).

1st Phase - Poles installation on basements


The 2nd phase consists in the cantilevers installation on poles.

A self propelled wagon with platform (C), equipped with hydraulic crane is normally used to

carry out this operation. A suitable flat wagon (B) is used to transport the pole cantilevers.

These are fixed to the poles by the crane directly operated from the working platform. The self

propelled wagon with hydraulic platform works also as traction truck of the flat wagon which

transports the pole cantilevers.

2nd Phase - Cantilevers installation on poles


The 3rd phase consists in the cable(s) stringing, messenger wires - contact wires.

The constant tension stringing system guarantee the installation of the conductors at the final

operating tension. This system allows the operators to carry out the next phase (droppers

installation) in shorter time because the conductors are already properly positioned on their

cantilevers. The system also allows to save time because more than one operation is carried out at

the same time. This phase is performed by a traction unit (self propelled rail truck, A), a constant

tension stringing wagon (D) and a self propelled wagon with MAT and hydraulic platform (E).

3rd Phase - Cable(s) stringing


The 4th phase consists in installation of vertical wires called droppers. They connect the contact

wire to the messenger wire and the job is completed. This phase starts after the self propelled

wagon with MAT and platform fixes the messenger wire to the pole cantilevers. This is possible

because the conductors are tensioned at the final operating tension. The messenger wire on the

pole cantilevers will not vary its position as well the pole cantilevers will be kept orthogonal to the

poles. This phase is carried out by is a self propelled wagon with hydraulic platform (C) able to

carry at least two operators and a certain number of droppers. Normally more than one self

propelled wagon are required.

4th Phase - Droppers installation


The 5th phase consists in the catenary final test, in order to check the right position of the

contact wire (height and wires off-set) and eventually carry out the necessary adjustments.

A dedicated machine called “multipurpose self propelled wagon" (F) is used to carry out this

operation. It is equipped with developable working platform, hydraulic derricks to support and

move away the catenary from the pole cantilevers and allow the adjustment of the position,

line pantograph to perform electrical and dynamic final tests and to draw up documents

showing the correct position of the contact wire, for own use as well as for client use.

5th Phase - Catenary final test


Index



Advantages of ACIM


The aims of the “ACIM” is the construction of the Electrified Catenary for Railway Lines with the

most accurate tension in the shorter time possible.

Accuracy

This system is in continuous development. Actually the construction of high speed train

increase again the tension accuracy requirement for contact and messenger wires.

It is essential that the tension applied on them is constant all times during the stringing

operations, from the beginning to the end of one complete section (approx. 1400-1600

meters).

Performance

With the latest Equipment designed by Tesmec and its partners and a well trained working

team it possible today to complete a line section of 1400-1600 meters in less than two hours.

Anyone in Railways construction knows how the time factor is important for a new line and

crucial in case of maintenance of existing line.

Advantages of ACIM


In particular, the advantages of the ACIM are due to the specific characteristics of:

A. The Traction Unit (self propelled rail truck)

It is a railway engine expressly designed for

this operation.

It has a relevant traction force, suitable for

towing the constant tension stringing wagon

with the wires tensioned, at a very low speed

and with a system which allows the variation of

the translation speed in a soft way, according to

different working requirements, without

having to stop during the stringing

operations, only increasing and reducing the

translation speed.

Advantages of ACIM


D. The Constant Tension Stringing Wagon

It is provided with the equipment for the constant tension stringing of the catenary

conductors (wires and ropes), either simultaneously and individually, at the final operating

tension. The Tesmec constant stringing wagon systems has very compact dimensions, high

reliability and low maintenance costs and offer the following main features and advantages:

Automatic control of the pre-set stringing

tension forces on the cables with high accuracy

for both contact and messenger wires without

causing any cable rotation or twisting.

The high accuracy allows the installation of the

droppers at the same time in the same

working section with considerable time saving

No effect on the tension force values due to

the profile of the line or due to speed changes

while stringing.

All functions are controlled by one operator

from a central control console.

Advantages of ACIM


If we could measure the mechanical tension on the conductors when the constant tension

stringing wagon starts moving (instantaneous phase), we could see the physical phenomenon

which leads to an instantaneous increase of the mechanical tension on the conductors. Then,

once the translation speed is achieved, the mechanical tension stabilizes at the set value.

Advantages of ACIM

It is extremely important because it allows the

installation of the conductors to the pole cantilevers

without stopping the traction unit and the constant

tension stringing wagon and the coming out of the

conductors tensioned at the final operating tension

from the capstan tensioner. In fact, different stops

and restarts of the constant tension stringing system

cause different mechanical tensions on the

conductors when the constant tension stringing

wagon moves on again, following the physic

principle which says that the static friction is two

times the kinetic one.

E. The Self Propelled Wagon with MAT and Hydraulic Platform


In conclusion, ACIM (constant tension without stops), is

the best system available for the catenary stringing,

without stressing the conductors (stops and restarts) and

with relevant advantages in terms of accuracy,

performance and timing saving.

The Tesmec System is the result of three important

factors:

The consolidated capability of Tesmec in construction of

Stringing Machines and Stringing Operation Procedures

The collaboration with important experience partners in

construction of Railway Ancillary Equipment

The Feedback experience by our customers, Railways

Bureaux as well construction companies.

Advantages of ACIM

TESMEC S.p.A - Headquarters

via Zanica, 17/O - 24050 Grassobbio (BG) - Italy

Tel. +39.035.423 2911 - Fax +39.035.4522444 Management and Administration

Fax +39.035.4522445 Stringing Equipment Division - Fax +39.035.335664 Trencher Division

www.tesmec.com - [email protected]

Tesmec Presentation-Railway Equipment-ACIM ACIM-EN... · 2017. 1. 7. · 12/10/2010 Tesmec Presentation-RE-SY-ACIM-EN-Rev 02 4/20 The complete system is composed by: A. Traction Unit

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