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Manual de exploatare a frezelor de asfalt Wirgen


  • Cold milling machines

    Calculating the working performance


    0 2 4 6 8 10 12 14 16 18 20 22 24 26 28

    0 500 1000 1500 2000 2500

    Hard asphalt

    Soft asphalt

    Most common working range

  • 2 // 3


    Purpose of this brochure 4

    How to use this brochure to determine the performance values 6

    Performance diagrams and sample calculations for:

    Cold milling machine W 350 8

    Cold milling machine W 35 10

    Cold milling machine W 35 DC 12

    Cold milling machine W 500 14

    Cold milling machine W 50 16

    Cold milling machine W 50 DC 18

    Cold milling machine W 600 DC 20

    Cold milling machine W 1000 L 22

    Cold milling machine 1000 C 24

    Cold milling machine W 1000 26

    Cold milling machine W 1000 F 28

    Cold milling machine W 1200 F 30

    Cold milling machine W 1300 F 32

    Cold milling machine 1300 DC 34

    Cold milling machine 2000 DC 36

    Cold milling machine W 1500 38

    Cold milling machine W 1900 40

    Cold milling machine W 2000 42

    Cold milling machine 2100 DC 44

    Cold milling machine W 2100 46

    Cold milling machine W 2200 48

  • the machine parameters

    the material parameters

    the site conditions

    the traffic situation

    the transport capacity for transport of the milled material

    the experience of the operating staff.

    This brochure has been compiled on the basis of Wirtgens

    decades of know-how and customers practical experience

    in the field, in order to provide the user with a useful tool for

    calculating the working performance of his machines.

    The output of a milling machine in practice depends on numerous influencing factors. The most important of these are:

    Purpose of this brochure

    This brochure presents performance diagrams of the

    Wirtgen milling machines, as determined in extensive

    test series involving the milling of asphalt pavements in

    Western Europe.

    These performance diagrams are supplemented by

    mathematical formulas which allow the determination

    of the area output achieved in practical site operations.

    With the aid of this tool, the user can roughly calculate the

    hourly or daily output to be expected of his machine.

    However, a few assumptions first have to be made, which

    have an effect on the result. The users experience in

    correctly estimating the prevailing local conditions is of

    particular importance in this context.

    Despite the good applicability of the diagrams, formulas

    and values given, Wirtgen GmbH cannot accept any liability

    in relation to the calculation methods. All figures are for

    information only and not binding. No part of this brochure

    may be reprinted or duplicated.

    Milling of complete asphalt pavements in asingle operation.

    The heart of the milling machine: the milling drum of a high-capacity machine with easilyreplaceable milling cutters and patented HT3 Plus interchangeable toolholder system.

  • FrstiefeT (cm)











    00 2 4 6 8 10 12 14 16 18 20 22

    0 50 100 150 200 250 300 350 400 450

    harter Asphalt

    weicher Asphalt

    hufigster Arbeitsbereich

    VorschubV (m/min)theoretischeFlchenleistungFT (m


    5 // 54 // 5






    Operating staff

    Working width Asphalt/Concrete Milling depth Cordoned-off site Number of trucksExperienced/inexperienced

    Engine output Type of rockhard/softUnobstructed

    area Obstacles Organisation

    Weight Grain shaperound or broken Partial repair work Traffic situation

    Cutting speed Grain distributionInfluencing factorsobstructing work

    Type of cuttingtool, spacing

    Type of binderhard/soft

    Travel drive Crawler track/wheel Temperature

    Area output

    Factors influencing the milling output

    With the aid of this brochure, you can find the right machine for every job. This guaranteesmaximum economy and rapid site completion.

    Highly manoeuvrable small milling machinesreduce the amount of re-work required.

  • How to use this brochure to determinethe performance values

    1. Selecting the type of machine

    The type of machine to be used for a construction job has to

    be selected first, so that its performance data can be deter-

    mined. A total of 21 different types of machines both from

    Wirtgens current range and older models are available for

    this purpose in this brochure.

    2. Determining the theoretical area output from

    the diagram

    Starting with the selected milling depth and the assumed

    pavement hardness (N.B.: This has a major influence on the

    milling output!), the rate of advance in m/min and the asso-

    ciated theoretical area output in m2/h are determined from

    the appropriate diagram. If the probable pavement hardness

    is not known, it may be advisable to carry out the calcula-

    tions below using different assumed values.

    3. Determining the allowance factor

    The allowance factor must now be determined for the

    construction project to which the calculations apply. These

    factors are listed both for work in built-up areas and for work

    in open country. These values are not fixed, but usually vary

    within a certain range.

    The following facts may considerably reduce the

    performance in practice:

    Long delays waiting for trucks

    Several, separate areas to be milled, requiring repeated

    transfer of the machine

    Traffic impeding the milling work

    Obstacles in the road (manhole covers, hydrants, gas

    and water valves, rainwater inlets, etc.)

    Winding roads, uphill and downhill work, etc.

    Inclement weather

    Other factors obstructing the work or unavoidable


    Under certain circumstances, it may be useful to perform

    the calculations using two different allowance factors.

    4. Calculating the practical output data

    The practical milling output, the reclaimed quantities and

    volumes, and also the working time required, can now be

    calculated with the aid of the formulas given here.

    Two complete typical sample calculations are included

    for each of the 21 types of machine, in order to explain the

    procedure. These examples apply when milling asphalt

    pavements at a ground temperature of approx. 15 C.

  • 6 // 7

    The high output of the milling machine requires the availability of sufficient truck capacity to take away the reclaimed material. Calculatingthe milling output permits accurate estimation of the volume of reclaimed material, resulting in highly economical operations.

    Additional points to be considered:

    Temperature of the pavement to be milled

    In practice, the achievable milling output essentially

    depends, among other things, on the temperature of the

    pavement. In this context, the values given in this brochure

    refer to a ground temperature of approx. 15 C.

    The binder (bitumen) becomes softer at higher temperatures.

    The result is an increase in the milling output, as the entire

    pavement can be detached more easily and the milling

    machine encounters less resistance. The reverse applies at

    lower temperatures, in which case a lower practical milling

    output must be expected.

    As a mathematical rule-of-thumb, it can be anticipated

    that roughly 60 % of the listed output can be achieved at

    a ground temperature of 0 C. In contrast, 1.3 times the

    practical milling output can be expected at a ground

    temperature of 30 C:

    0 C: Area output at 0 C = 0.6 x Area output

    at 15C

    30 C: Area output at 30 C = 1.3 x Area output

    at 15 C

    To be calculated differently:

    Milling of concrete surfaces

    The calculations and examples presented in this brochure

    refer exclusively to the milling of asphalt surfaces. The use

    of the curves is limited to making estimates when milling

    concrete. To this end, the value for the theoretical area

    output when milling hard asphalt must be multiplied by a

    factor of 0.3. This gives a rough estimate of the practical

    milling capacities to be expected when milling concrete.

    When milling concrete, there is no need for the approximate

    calculation to include any temperature influence on the

    milling output.

    Moreover, when milling concrete, it must also be borne

    in mind that the theoretical milling depth of the type of

    machine involved cannot be exploited to such a great

    extent as when milling asphalt.

  • Cold milling machine W 350

    Calculation of the practical area output FP:

    Calculation of the practical reclaimed volume QV:

    Calculation of the practical reclaimed quantity QT:

    Calculation of the total reclaimed volume for the job QGV:

    Calculation of the total reclaimed quantity for the job QGT:

    Calculation of the working time required for the job Z:

    Technical data:

    Engine output ................................................. 42 kW/56 HP/57 PS

    Milling width .................................................................................. 35 cm

    Milling depth ............................................................................ 010 cm

    FP (m2/h) = A x FT

    QV (m3/h) = FP x T x 0.013

    QT (t /h) = FP x T x 0.024

    QGV (m3) = FF x T x 0.013

    QGT (t) = FF x T x 0.024

    Z (h) = FF/FP