manual freze wirtgen

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Manual de exploatare a frezelor de asfalt Wirgen

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• Cold milling machines

Calculating the working performance

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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

Contents

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)

20

18

16

14

12

10

8

6

4

2

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

2/h)

5 // 54 // 5

Machineparameters

Machineparameters

Siteconditions

Trafficsituation

Transportcapacity

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

interruptions.

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.

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

Legend:

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