Patent Grant
9982397
This application is a 35 U.S.C. 371 National Phase Entry Application from PCT/EP2012/075041, filed Dec. 11, 2012, which claims the benefit of German Patent Application No. 10 2012 208 554.8 filed on May 22, 2012, the disclosures of which are incorporated herein in their entirety by reference.
The present invention relates to a method for planning and implementation of compacting processes, especially for asphalt compacting, by means of at least one compactor.
In compacting and in preparation for compacting of soil surfaces, such as asphalted roads or the like, it is of fundamental importance that after application of the material for compacting, for example asphalt, using one or several compactors, a sequence of the compacting procedure is selected that is suitable for the quality of the compacted soil to be achieved, wherein this sequence firstly is defined by the number of passes by one or several compactors, and secondly by the position of the compacting paths selected for the particular passes. Too many passes over the material to be compacted can lead to excessive compaction, which can result in unevenness over a larger base region, especially in the case of irregular compacting. Similarly, an insufficient number of passes results in insufficient compaction of the material to be compacted, which adversely affects not only the quality of the finished material with respect to its structure, but also its smoothness.
From DE 10 2007 019 419 A1 a method is known for determining the degree of compaction of a base region. In this method, the already attained degree of compaction is deduced from various parameters determined during the compacting process. The base region to be compacted is rolled repeatedly until compaction reaches the desired level.
The object of the present invention is to specify a method for planning and implementation of soil compacting processes, especially for compacting asphalt, by means of at least one compactor, so that provided there is efficient use of compactors for soil compacting, an improved compacting result can be achieved.
According to the invention, this object is attained by a method for planning and implementation of compacting processes, especially for compacting asphalt, by means of at least one compactor, comprising the following steps:
With the invented method, even before implementation of a compacting process, the relevant aspects of said process are planned and then implemented according to this plan, that is, the compacting plan. This will ensure that no unnecessarily large number of compactor passes is used, which on the one hand reduces the efficiency of overall processing, and on the other entails the problem of uncertain compaction of the material. By means of preceding planning it can be determined precisely where and how often one or several compactors must be moved over the base region to be compacted so as to attain the desired goal, namely a specified degree of compaction which is to be as consistent as possible over the surface to be compacted.
In order to be able to further enhance the efficiency of the inventive method and to further improve the compacting result, it is recommended that step a) also include defining at least one compactor to be employed for compacting of the base region and that in step b), the compacting plan be further defined on the basis of the at least one compactor to be employed for the compacting. With allowance for the compactor to be used, in preparation of the compacting plan it can be ensured that a desired degree of compaction can be obtained as quickly and as precisely as possible.
The at least one compactor to be used for compacting the base region can be selected from a group containing compactors that differs in at least one of the following parameters:
It should be pointed out here that the crab steering capability describes whether or to what extent two compactor rollers of a compactor can be offset with respect to each other transversely to the direction of motion of said compactor, so that a zone exists in which the two compactor rollers overlap, and each roller has a zone in which it extends laterally past the other roller.
The edge regions of the base region and/or at least one of these edge regions and/or the course thereof are of particular importance in defining the base region to be compacted or its geometric course. For example, this kind of edge region can form the starting basis for determining the sequence of compactor passes. It is therefore proposed that at least one edge region of the base region to be compacted be determined by a device, preferably an asphalt finisher, which is preferably moved along the base region to be compacted and prepares it. A device preparing the base region, for example an asphalt finisher, which applies the asphalt for compacting, moves precisely in that area where subsequently a compactor is to be moved to implement a compacting process. With the movement of this device, for example an asphalt finisher, it is thus easily possible to determine the course of at least one edge region and to use it for subsequent preparation of the compacting plan.
The base region to be compacted can be defined in terms of its edge region, so that ultimately the minimum or maximum number of adjacent compactor passes can be determined that are needed to completely or nearly completely and adequately frequently cover the base region. It is self-evident that the base region to be compacted can also be determined in terms of the material to be compacted, that is, asphalt or the like, for example, and its layering, or in terms of the degree of compaction desired in execution of the compaction process.
In rolling the base region to be compacted with one or several compactors, in order to ensure that the base region can be entirely covered and no areas are left in which the desired compacting target is not attained due to insufficient passes, it is proposed that in step b), the compacting plan be defined with at least one group of compactor passes, wherein at least one group of compactor passes comprises a plurality of adjacent compactor passes in the base region width direction, and wherein at least two, preferably all adjacent compactor passes have mutually overlapping compacting paths. Considering that during the forward movement of a compactor there is an unavoidable inaccuracy and/or imprecision with respect to the surface area actually rolled, the overlap between adjacent compacting paths will ensure that in fact every surface area can be covered. In particular the overlap should be selected advantageously such that it is at least as large as, and preferably larger, than the unavoidable imprecision in the forward movement of a compactor with respect to the surface areas actually covered.
The invention provides in a particularly advantageous manner that in at least one group of compactor passes, all adjacent compacting paths each have a substantially equal amount of overlap.
When several groups of compactor passes are needed to achieve the desired degree of compaction, to ensure that the overlaps present in the different groups between adjacent compacting paths do not lie one atop the other, thus that the overlapping areas of different groups can in fact be located in different surface areas of the base region to be compacted, it is proposed that for at least one group of compactor passes, the adjacent compacting paths have a different amount of overlap with respect to at least one other group of compactor passes.
Since in general a base region to be compacted is bordered by at least one edge region, for efficient implementation of the method it is proposed that for at least one group of compactor passes, at least one compacting path is defined substantially flush along an edge region of the base region to be compacted. The expression “substantially flush” is intended here to mean that the compacting path running along the edge region is positioned such that in the edge region, substantially no surface area remains in which the material being compacted is not covered by one compactor pass, but that care must still be taken that a compactor with its compactor roller(s) does not go unnecessarily far beyond the edge region into an area in which there is no more soil material to be compacted. However, if there is no curb present to demarcate the base region to be compacted, for example, and considering the unavoidable imprecision of forward movement of a compactor, some overhang can be defined in order to ensure that the entire base region to be compacted is covered.
To attain the most uniform possible compaction of the base region, it is proposed that for at least one group of compactor passes, one compacting path is defined that is substantially flush along a first edge region, and an additional compacting path is defined that is substantially flush along a second edge region of the base region to be compacted, and that for at least one group of compactor passes, a compacting path is defined that is substantially flush along the first edge region, and/or for at least one group of compactor passes, one compacting path is defined that is substantially flush along the second edge region.
At least some and preferably all compacting paths of at least one group of compactor passes, preferably substantially all compactor passes, can be executed such that they run substantially in the direction of a base region longitudinal direction, which can, for example, be substantially orthogonal to the base region width direction.
For efficient implementation of the inventive method, assuring uniform compaction, it is proposed that in step b) the minimum number of compactor passes is determined on the basis of the width of the base region, the width of the compactor roller, and a minimum amount of overlap of adjacent compacting paths. The minimum number of compactor passes can be determined such that the following relation is satisfied:
BB−(VWB−MÜA)≤n×VWB−(n−1)×MÜA−GÜST≤BB,
Wherein:
This takes into account that for a given number of compactor passes, the overlap areas produced between these adjacent passes and/or their compacting paths are 1 less than the number of compacting paths, and that in addition a remaining surface area not covered by a compacting path is smaller than the width of the compactor roller(s) used for the compacting. Of course, here too it can also be taken into account that when one of the compacting paths is defined along an edge region, this compacting path can be located to the side, with a defined overhang extending beyond the edge region in order to ensure that the edge region is also entirely covered.
In addition, for efficient implementation of the method, it is proposed that in step b) the maximum number of compactor passes be determined on the basis of the width of the base region, the width of the compactor roller, and a minimum amount of overlap of adjacent compacting paths, wherein the maximum compactor pass number can be determined such that the following relation is satisfied:
BB≤N×VWB−(N−1)×MÜA−GÜST≤BB+VWB,
Wherein:
In particular this procedure takes into account that when adjacent compacting paths overlap to an extent corresponding to the minimum amount of overlap, due to the actually provided compacting paths, the entire base region is substantially covered in the base region width direction, wherein in both edge regions each overhang of the specifically defined compacting path can also be taken into account.
Preferably the maximum number of compactor passes and the minimum number of compactor passes differ by 1, so that in general the following relation applies:
N=n+1.
In particular when the entire base region is to be covered by one group of compactor passes in the base region width direction, in order to attain a uniform distribution of the compacting paths, it is proposed that for one group of compactor passes with a maximum compactor pass quantity, one compacting path is defined substantially flush along a first edge region and an additional compacting path is defined substantially flush along a second edge region of the base region to be compacted, and that the amount of overlap of adjacent compacting paths of this group of compactor passes is determined such that essentially the following relation applies:
BB+GÜST=N×VWB−(N−1)×ÜA,
Wherein:
Here also it can be taken into account that in one or both edge regions, the compacting path defined there can extend laterally beyond the edge region, wherein the parameter BB must then be added to the total amount of overhang in the two edge regions. The result of this is that any remaining or available overlap of individual compacting paths is smaller than when no overhang is present in one or possibly both edge regions.
In the procedure according to the invention, at least one compactor pass, preferably all compactor passes, can be defined such that movement of at least one compactor for compacting the base region is forward in a first movement direction and backward in a second movement direction, opposite to the first movement direction.
With a compactor pass defined in this manner, when preparing the compacting plan it must be taken into account that in a compactor pass, the rolled surface area of the base region being compacted is compacted two times by the compactor. For example, if a compactor has two compactor rollers arranged in series in its direction of forward movement, then this means that in one compactor pass, compaction will be by a total of four roller passes. Quite obviously it is also possible to define a compactor pass differently. For instance, every individual roller pass could be interpreted as a compactor pass. If a compactor has two compacting rollers and if it moves once forward and once backward along a compacting path in the base region to be compacted, this means that with this definition of a compactor pass, a total of four compactor passes are executed.
The present invention will be described in detail below with reference to the attached figures. Wherein:
The compactor 10 in the illustrated example comprises two compactor rollers 12, 14, generally also termed drums. The compactor roller 12 is mounted on a front compactor frame 16 in a rotatable manner and can also be driven to rotate. Compactor roller 14 is mounted on a front compactor frame 18 in a rotatable manner and can also be driven to rotate. The front frame 16 and the rear frame 18 are mounted on a middle frame 20 so as to be pivotable about vertical axes A1 and A2 by means of a pivot drive (not shown). First of all this allows directional control, and secondly allows the use of so-called crab steering. In this regard, the front roller 12 and the rear roller 14 are turned in the side direction, that is, offset with respect to one another orthogonally to the plane of the illustration in
A driver's cab denoted by reference number 22 is provided on the middle compactor frame 20 with a seat 24 and a display 26. Via the display 26, information relevant to the compacting process can be displayed for the operator seated on the seat 24.
By means of a radio unit denoted in general by reference number 28, the compactor 10 can send information to and/or receive information from a central station or another compactor. Furthermore, the radio unit 28 can also be designed as a GPS unit and in this manner can receive information about the positioning of the compactor 10 in space.
It should be pointed out here that when implementing a compacting process, even differently configured compactors can be employed. For example, they can be designed without the crab steering feature. The compactors can also differ in the number of compacting rollers used, and if a compactor has only one compactor roller, it can in general have wheels in the rear area of the frame for propulsion. Compactors can also differ in the width of the one or several compacting rollers, likewise also in the compactor weight or weight distribution on the two rollers.
One essential aspect in which these compactors may differ is the compaction modes that they can use. This includes various physical aspects in addition to the surface load applied by the intrinsic weight, by which the compacting result attained by a compactor pass can be affected or adjusted. One such compacting mode, for example, is the vibration mode in which a vibration mechanism located in one particular compactor roller causes the compactor roller to perform an oscillating movement essentially in the vertical direction. Another compacting mode can comprise an oscillation operation in which a compactor roller is driven by an oscillation drive to perform an oscillating movement in the circumferential direction about its roller axis of rotation. Of course, these different operating modes can also differ in their particular oscillation frequency or amplitude. In this context it is basically also possible to provide an oscillation mode and a vibration mode in one and the same compactor roller. The compacting modes can also include a static compacting mode, that is, rolling with one or more compactor rollers without additional generation of oscillating movements. In this regard it should be pointed out that the expression Global Positioning System (GPS) here represents a plurality of different, generally satellite-based systems which allow real-time determination of the position of a device equipped with one such unit, that is for example, a compactor or an asphalt finisher or similar equipment, and accordingly to provide the data representing this position or the motion sequence, or to use such data to control forward movement, for example. In this regard it is also possible, in particular, to interpret several grouped rubber wheels, possibly offset or overlapping one other, in their entirety as one or several compactor rollers.
With the use of one or several compactors, for example, as illustrated in
When selecting the compactor(s) to be used, in general the structure of the material M to be compacted also has to be taken into account, or the compacting result desired after completion of the compacting process. In particular in road construction, an asphalt model can be prepared, in a known manner, in which the desired degree of compaction can be specified with allowance for asphalt layering. With allowance for this desired degree of compaction, one or several employed compactors can be selected from among a group of compactors which differ in at least one of the parameters specified and mentioned above. When selecting several compactors from the group, of course compactors having the same design can also be used. This means that in the group of fundamentally different compactors, several compactors of the same type can also be grouped together. In addition, with allowance for this asphalt model or a model in general which represents the compacting result, it can be specified how many passes are needed with the selected compactor(s) in order to achieve the desired degree of compaction.
Based on these criteria, that is, the criteria which, on the one hand, define the base region to be compacted, for example in terms of its geometric characteristics and the desired compacting success, and on the other, based on the selected compactor(s) and/or their design, are used to devise a compacting plan that specifies how the compactor(s) are to move in the base region being compacted in order to ensure that the desired success, namely a particular degree of compaction, can be attained. This preparation of a compacting plan is described in detail below with reference to
The course of the base region B to be compacted in the base region longitudinal direction RL, which is indicated primarily also in
If the total width of the base region B to be compacted, that is, the lateral separation of the two edge regions BR1 and BR2, exceeds the working width of one such device, that is for example, an asphalt finisher, then at the two side areas of this device, GPS units can be provided which detect the assigned edge region BR1 and/or BR2 so that in a prior movement step, both edge regions BR1, BR2 are detected and/or the data defining their position in space are determined and can be processed for preparation of the compacting plan. Alternatively, it is also possible to detect by measurement only the position of a single edge region and then to calculate the location of the other edge region by using knowledge of the width of the base region B. In particular when the base region B is so wide that prior processing is not possible with a single device, such as with a single asphalt finisher, then several such finishers can be operated side by side, at somewhat of an offset in the production direction, in order to apply several asphalt layers which in their totality define the base region B to be compacted. Then the GPS units detecting the two edge regions BR1, BR2 can be located on each of the different devices moving along the particular edge region.
In particular when preparing the base region B for compacting with several devices, asphalt finishers for example, the total base region processed by all these devices can be used in its totality as the base region B to be compacted in order to prepare the compacting plan, especially when using the edge regions bordering this total region. Alternatively, it is possible to define a separate base region B, with particular edge regions BR1 and BR2 to be allocated to each of the individual devices, wherein several such base regions B, each to be provided with its own compaction plan, can lie next to one another, and then the edge region BR1 of the one base region B will substantially correspond to the edge region BR2 of the adjacent base region B.
To prepare a compacting plan, for example a first group G1 of compactor passes BVÜ can be defined. Each compactor pass BVÜ is assigned to a compacting path ÜS, along which a compactor 10 such as that illustrated for example in
The first group G1 of compactor passes BVÜ illustrated in
From
It is further evident that the compacting paths ÜS1a to ÜS1d are placed so that adjacent compacting paths ÜS overlap each other with a certain amount of overlap ÜA1. This amount of overlap ÜA1 is the same for all three of the overlap areas Ü1ab, Ü1bc, and U1cd here between adjacent compacting paths ÜS, so that a uniform distribution of the compacting paths ÜS is obtained in the base region width direction RB.
In the second group G2, it is evident for example that under the proviso that the amount of overlap ÜA2 is in the vicinity of the minimum amount of overlap, the three specified compactor passes BVÜ2a, BVÜ2b, and BVÜ2c cannot cover the total width of base region BB of the base region B to be compacted. A non-rolled edge strip N2 remains.
The third group G3 of compactor passes BVÜ likewise has three compactor passes BVÜ3a, BVÜ3b, and BVÜ3c, with compacting paths ÜS3a, ÜS3b, and ÜS3c respectively. The compactor passes BVU of the third group G3 are configured such that the compacting path ÜS3c of the compactor pass BVÜ3c shown in the far right in
The amount of overlap ÜA3 provided in this third group G3 of compactor passes BVÜ can also be selected at or near a minimum amount of overlap, in order to cover the largest possible surface area in the base region width direction RB with the three defined compactor passes BVÜ3a, BVÜ3b and BVÜ3c. Nonetheless here too there is an edge strip N3 in which the base region B is not rolled in the third group G3 of compactor passes in the base region width direction BB and is thus not compacted.
For example, the positioning of the second group G2 of compactor passes BVÜ in a base region B is depicted in a top view in
If necessary, several such groups G1, G2, and G3 can be laid one over the other to prepare a compacting plan, that is, they can be executed one after the other. For example, the sequence could be such that first the group G1 is executed, then group G2, and then group G3. The result will be that, disregarding the overlap areas Ü1ab, Ü1bc, Ü1cd, Ü2ab, Ü2bc, Ü3ab, and Ü3bc between adjacent compacting paths ÜS, in the base region width direction BB nearly every surface area of base region B is covered by three passes. If one also considers that in each of the groups G1, G2, G3, the overlap areas Ü1ab, Ü1bc, Ü1cd, Ü2ab, Ü2bc, Ü3ab, and Ü3bc are present, in which a double pass occurs, and if one further considers—as a comparison of
Based on two groups G2′ and G1′ of compactor passes BVÜ,
With respect to group G2′, which otherwise corresponds to the group G2, it is evident that the compactor pass BVÜ2a on the far left, that is, near the edge region BR1, extends laterally over the edge region BR1 with an overhang ÜST which is defined here by the total overhang GÜST. The result is that the otherwise equally formed group G2′ of compactor passes BVÜ is shifted to the left, that is, in the direction of edge region BR1. The result of this is that the uncovered edge area N2′ is larger than in the case when the compactor pass BVÜ2a runs as precisely as possible along the edge region BR1 without the overhang ÜST.
With regard to group G1′, which is also depicted in
As already disclosed above, in accordance with the asphalt model cited above, the number of compactor passes and/or of the individual passes referred to the compactor rollers can be specified and then combined into a compacting plan through the corresponding overlay of said groups of compactor passes. In this context it is self-evident that the compactor passes or groups of compactor passes combined into one such compacting plan can be positioned or configured differently than depicted in
After preparation of this kind of compacting plan with the corresponding definition of the location of the compacting paths in the base region B to be processed, this plan can be converted into a geodata model. This means that the initially abstract compacting paths ÜS running in the base region B are converted into geodata which describe the actual course of a particular compacting path in space. These data can then be transmitted to the specific compactor that is to be used, so that the potential is created in the compactor itself to move it along the compacting paths now present in geodata. This can be implemented fully automatically, for example in that, by allowing for the GPS signals received over the radio receiver 28 and comparing the geodata of a particular compacting path stored in the compactor 10, the compactor 10 is steered automatically with no significant interaction required on the part of the operator. In an alternative procedure, the course of compacting paths could be displayed on the display 26, just as the position of the compactor 10 or its path, so that an operator 10 is able to move the compactor 10 along the compacting path indicated on the display 26 with the smallest possible deviation. In this regard the course of movement of the compactor 10 can then be recorded and maintained as backup data so as to check subsequently that the compactor 10 was in fact moved with the necessary precision along the compacting paths specified in the compacting plan. Of course, data can also be stored that further specifies the completed compacting process, for example data relating to the compacting mode of a specific compactor or even possible errors, for example the failure of a system needed for setting a compactor mode, such as a vibration mechanism or an oscillation mechanism.
The entity preparing the compacting plan, for example, the central station optionally receiving data regarding the course of the edge regions, need not necessarily be separated from a compactor employed for soil compaction. For example, it can also be located on a compactor and can use the information generated by conversion of the particular compacting paths into geodata to guide a compactor along a particular, defined compacting path, or to display relevant information. Furthermore, it is also possible that such a central station provided on a compactor also communicates with other compactors operating in this or in another base region being compacted, in order to transmit the geodata to them regarding the compacting paths necessary for a particular compacting step based on the compacting plans prepared for the particular compactor.
| Number | Date | Country | Kind |
|---|---|---|---|
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| Filing Document | Filing Date | Country | Kind |
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| PCT/EP2012/075041 | 12/11/2012 | WO | 00 |
| Publishing Document | Publishing Date | Country | Kind |
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| WO2013/174458 | 11/28/2013 | WO | A |
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