Note : Les descriptions sont présentées dans la langue officielle dans laquelle elles ont été soumises.
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FIELD OF THE INVENTION
~he invention relates to a method for filling tracks worn
in roadways with roadmaking material, preferably asphalt,
in which the old material of the marginal regions of the
tracks is replasticized by heating.
A method of this kind has been described.
Only the actual tracks are refilled in this known method,
whereas the roadway strip lying between two neighbouring
tracks is not renewed. (Gerlllan Specification DE-A-25 24 762)o
~he invention also relates to a device for carrying out
the method. In this co~nection an apparatus is known which
comprises two stripping-laying apparatus which are arranged
at a distance from on~ another laterally of the working
direction and serve to fill two adjacent tracks. ~he strip
of roadway lying between the stripping-laying apparatus
for filling two adjacent tracks is not therefore covered
by this apparatus as well, as a result of which this inter-
mediate strip remains at the original, low road level as
compared with the inner edges of the asphalt strip filling
the tracks.
According to this prior art~ pools of wa-ter, which give
rise to accidents, are formed between the two inner
edges of the track-fillin~ material, laid in
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strips, as a result of rain or melted snow. Road users are
also presented with a disturbing optical effec-t, caused by
the two separate asphalt tracks.
OBJ13CT OF THE INVENTION
~he object of the invention is to provide a method and a
device with which the formation of a difference in level
between the filled tracks and the intermediate strip of
roadway can be avoided by simple means.
SUMMARY OF I~lE INVENTION
.
The pres~nt inven~ion provides a method in which road-
making material is simultaneously laid in two adjacent tracks
and in the intermediate strip, for which purpose the old material
of the, margi~a-l- regions of the tracks is replastici~ed
-aæ well as that of the intermediate strip and,
should the old surface of the intermediate strip be
higher than the outer marginal regions of the two tracks,
the re-plasticized material of the întermediate strip is
removed to at least the same level as the outer margi~al
regions of the two tracks, the removed material is laid in
the tracks~and, finally, the uncovered surface of the inter~
mediate strip is roughened before the new material is laid.
,
The method according to the invention enables the abo~e-
men~ioned disadvantages of the prior art to be avoided and,
a solid and plane top layer of uniform appearance to be pro-
vided by using a construction method which is extremely
economical as regards material.
The material-saving and therefore inexpensive laying method
results from two reasons. ~irstl~, the new material is applied
as thinly as possible to the intermediate strips between two
adjacent tracks, without an~ impairmant of the quality of
the surface. Secondly, should the old surface of the inter-
mediate strip be higher than the outer marginal regions of
the two tracks, the material which has been removed is re-
used, thus reducing the requixed quantity of new material.
~he device according to the invention for carrying out the
claime,d method is characterised in that a stripping element
is arranged between the adjacent stripping-laying apparatuses
and is connected to the adjacent stripping-lay.ing apparat~lses
such that the lower stripping edge of the stripping element
and the front ends of the lower stripping edges of the stripping-
laying apparatuses are disposed at the same levelO ~he
stripping element'is connected to the adjacent stripping-
laying apparatuses such that *he road surface which is not
covered when the tracks are filled in strips is provided with
a plane coating~
Stripping-laying apparatus of the above-mentioned type is
known from German Specification DE-B- 24 58 266 .
In order to prevent the asphalt, which is always pushed in
front of the apparatus according to the invention as surplus,
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from acc~nulating -to such an exten-t as to give rise to a
considerable pressure on the system consisting of the two
stripping-laying apparatuses and the stripping element accord-
ing to the invention so as to prevent the material being
laid satisfactorily, the stripping element is of angular
construction and preferably mounted with the apex of this
angle pointing to the front.
A further advantageous embodiment of the subject matter o~
the invention is provided in that the stripping element is
connected to the inner stripping plates of the adjacent
stripping-laying apparatuses such that the lower stripping
edges of the inner stripping plates o~ the adjacent stripping~
laying apparatuses are inclined with respect to the lower
stripping edge of the stripping element which is guided par-
allel to the surface of the road. It is thus possible to increase, as
required,the thicl~ness of the asphalt which is laid in the
centre, and thus th~ deepest part, o~ the track, without
the thickness being altered in an undesirable manner in the
region of the stripping element.
In accordance with a further advantageous embodiment of the
invention, the stripping element can consist of two~stripp-
ing surfaces which are hinged to each other and to the inner
edges of the adjacent i~ner stripping plates of the stripp-
ing laying apparatuses which only fill the tracks and the
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apex formed by the two stripping plates can be directed both
in and against the laying direction. A continuously variable
adaptation to the different widths of the interspaces result~
ing from the varying dimensions of the tracks is thus poss-
ible.
Should the old surface of the strip of roadway lying between
two adjacent, i e. associated, tracks, be higher than-the outer
marginal regions of these two tracks, levelling and rough~ning
devices are arranged in the working direction in front of the
laying apparatuses connected by the stripping element.
~y means of these devices the asphalt, which has been re-
plasticized in a previous working step, of a cambered inter-
mediate strip between two adjacent tracks is removed as far
as a predetermired level, this removed material is laid in
the two tracks and, finally, the exposed surface of the inter
mediate strip is roughened. The intermediate strip is there-
fore ready for the new material to be laid and the roughen-
ing operation simultaneously provides the requirement for
good bonding between the applied asphalt filler and the old
road surface~
.
Bulges in the asphalt, which frequently occur between the
tracks in asphalt roads, for example, were removed in previous
methods by cutters, rotating worms or steel rakes acting
at right angles to the axis of the road. However~
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these methods cannot easily be combined with an asphalt
construction, in which either the i.ndividual tracks alone
are to be filled in a technically perfect manner, and thus
without any subsequent secondary compression phenomena,
.or the levelled strip between two tracks or
between two pairs of tracks is to become an acceptable sec-
tion of the new road sur~ace. In the case of this asphalt
construction the entire strip between the outermost edges
of a pair of tracks should be plane and covered with fresh asph~
al.t i~ the ~am~sr provided so that the asphalt can be laid
in-the shape of a roof pro~ile in order to exclude subse-
quent secondary compressions, which are the beginning of
new track ~ormations.In this connection reference is again
made to the above-mentioned Specification DE-B- 24 48 2660
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'~he claimed device also enables the entire region of a road-
way surface between the outermost edges of a pair of tracks
to be covered with asphalt such that, following the comple-
tion of the surface reconstruction work, including the
secondary compression caused by the traffic~ a plane surface
.covering ~f.Nni~orm appearance results,whe~ the asphalt be-
tween two tracks or two pairs of tracks has cambered to
above the required level and there~ore it is not easily
possible to coat this roadway strip as well.
particularly simple levelling device lies in the fact
that this is formed by an angular levelling element whose
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apex points in the working direction.
~he roughening device is appropriately formed by a plurality
of roughening spikes arranged in the manner of a rake trans-
verse to the i~termediate strip.
Both devices can be combined and constructed in a simple
manner b~ arranging the roughening spikes directly at the
corners of the levelling element, the working surfaces of
the corners of the levelling element lying in front of the
roughening spikes in the working direction.
Embodiments of the device according to -the invention are
explained in the following with reference to the drawings
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1A is a schematic, perspective view of a stripping
element corresponding to the construction of the device
according to the invention and arranged obliquely with respect
to the working direction between two adjacent stripping-
laying apparatuses,
~igure 1~ is a schematic, perspective view of an alternative
construction of the device according to the invention~
~igure 1C is a sectional view of the roadway surface and a
side view of one of the stripping plates of the stripping
element and the stripping-laying apparatuses,
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Figure 2A is a section through the applied asphalt material
up to the surface of the old roadway surface with the tracks~
~igure 2B is a sectional view of the filling material laid
by the two stripping-laying apparatuse s;
~igure 2C is a section through the filling material which
has been applied to the roadway surface and leve].led to form
a plane surface by the stripping element according to the
invention;
Figure 2D is a section through the fillin~ materal..of the
finished surface coating which has been applied and compressed
b~ the stri.pping-laying apparatuses and the stripping element
according to the invention;
Figure 3A is a section through a roadway surface, in which
the roadway strip lying between two tracks is higher than
the outermost marginal`regions of the two tracks;and
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~igure 3~ is a schematic representation of the levelling
and roughening devices for the intermediate strip .
DESCRIPTION OF PREEERRED EMBODIMENTS
~igures 1A, 1C, 2A and 2C show the method of operation o~
the device according to the invention. According to these
drawings a stripping element 1 is attached totwo stripping-
la~ing apparatuses 3, which fill the tracks and are pu.Lled in
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the working direction A by a tractor which is not shown,
the said stripping element distributing the road surface
material as it is applied to the roadway surface b by a
tractor or another means such that it evenly fills the
interspace ~, which is not covered by the two adjacent
stripping-laying apparatuses 3, at the le~el c of the asphalt
layers borderi~g on both sides. ~he fill thickness f, which
usually varies and is dependent upon the depths of the
tracks and the easiness with which the filling material a
to be applied compresses, is adjusted by adjusting devices
9, 10 and 11. A new~ uniform and plane roadway surface i
is produced between the two edges ~ following the compression
of the fllling material a by rollers and tra`ffic (figure 2D).
Figure 1B shows a stripping element 2, which consists of
two stripping plates 2 which are connected together and to
the stripping-laying apparatuses 3 by hinged de~ice~ 7 and o
respectively. A strippin~ element of this kind, arranged in
hinged manner, is able to adapt to each change in distance
between the two stripping-laying apparatuses resulting from
the varying dimensions of the tracks.
~igure 2C clearly shows that the stripping edge 5 of the
stripping element 1 lies in a horizontal plane and gives rise
to a roadway surface according to figure 2A~ ~he stripping
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edge 6 of the strlpping plate 2 of the stripping-layi~g
apparatus extends upwards at an angle from the rear edge
of the stripping edge 5 of the stripping plate 2 of the
stripping element 1 and gives rise to a roadway surface
profile over the tracks corresponding to figure 2A.
~igure 3A is a schematic section through a roadway surface,
in which the surface O of the roadway strip Z lying between
two adjacent tracks S is higher in the reconstructed state
than the outer marginal regions R of the two tracks S.
In order to cover the intermediate strip Z so as to make
it flush with the tracks, it is necessary, in these cir-
cumstances, to replasticize the olcl, excess material of the
intermediate strip Z and subsequently to bring it down to
the same level ~1 as the outer mar~inal regions R of the two
tracks S. In this respect it is of great advan-tage to imm-
ediately fill the tracks S with the material which has been
removed, as the necessary ~uantity of new material is there-
by reduced and the cost of the reconstruction operation
can be considerably decreased. ~ollowing the removal of the
excess mater~al, the exposed surface of the intermediate
strip æ is roughened, so as to make provision for the
bonding of the new material which has been applied wîth the
old surface. ~he new material is simultaneously laid both
in the tracks S and in the intermediate strip Z, thus
producing a new, uniform and plane roadway surface correspond~.
ing to level ~2.
Figure 3B is a schematic representation of the devices adapted
for the above-mentioned operations. ~hey include an angular
levelling element, designated as a whole by 10, with lower
levelling edges 11, which are adjusted to the level N1 which
is to be reached in the region o~ the intermediate strip Z.
For this purpose the levelling element 10 i~ accordingly
adjustably arranged, for example on a pushing machine. ~he
angle oC between the two arms of the angular levelling element
is also variable, so that it can be adapted to the respective
width of the intermediate strip ZO Th~ apex .o~.the. angular.
~ leve~ling element 10 points in the working direction A
durirLg the movement of the levelling element in the work-
~ ing direction A over the intermediate strip Z, as a result
of which the previously re~plasticized, excess material of
the intermediate strip Z, which has been removed by this
movement,is proportionately pushed into the two adjacent
tracks S.
A roughening device is also provided whi~h comprises a plur-
alit~ of roughening spikes 40.arranged in the manner of
a rake transverse - to the intermediate strip Z. In order
to simplify this construction, angle irons 40, extending
parallel to the levelling edge 11~ are mounted on the rear
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faces~ with respect to the working direction A, of the two
arms of the levelling element 10 and are provided at regular
intervals with mountings 30, in which the roughening spikes
40 are mounted in essentially vertical alignment so as to be
adjustable in height.
The lavelling element 10 with the roughening spikes 40 is
arranged in the working direction in front of the stripping-
laying apparatuses 3 connected by the s-trippi~g element 1.
~he two subassemblies can be disposed on separate transport-
ing or pushing machines or on a common transporting machine.
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