[0001] The present invention concerns a automatic asphalt paver machine for roads and other
paved areas.
[0002] In prior art prior we know from PCT/SE81/00117 and IT-1144171 or EP-0049260 (AB SKANSKA
CEMENTCJUTERIET Sweden) a "Process for tack coating in road surface". This solution
raising the convenience to apply one anchorage stratum immediately before laying the
bituminous stratum on the road surface.
[0003] This solution consists in applying an anchorage tack coating on the road surface
(bitumen emulsion and water) before lying the asphalt carpet to perform a best sticking.
[0004] Namely the road surface is previously cleaned and a thin anchorage film of sticking
bituminous substance is sprayed before spread the next asphalt carpet.
[0005] Finishing machines (pavers) are well known to depose on the road surface new asphalt
layers, these self-movable machines or movable system crawler, involve in adjustable
order in rearward height asphalt distribution cochlea means, followed by rolling compacting
means having a minimum width to which rearward are associated movable sideways roller
compacting means having the further function to widen and compact the asphalt on a
larger extension on the road if compared of the width of the paver machine.
[0006] Similarly said cochlea means are symmetrically transversely laterally extendible
to distribute and to stretch the asphalt according as per a greater width to the minimum
width of the machine to satisfy the exigencies of a side speread by means of said
enlargeable compacting means.
[0007] The solution PCT/SE81/00117 corresponding to IT-1144171 or EP-0049260 (AS SKANSKA
CEMENTCJUTERIET) does not suggest how we can realize in effective way a bituminous
stick spray upwards of said enlargeable carpet distribution compacting rolling means.
[0008] Furthermore we verified that it is useful to have an on road spray device before
of said enlargeable carpet distribution means, this not only for what indicated in
the above-mentioned disclosures but also for other scopes as for example:
- the washing of the road or its cleaning before the deposition of the bituminous
stratum,
- solvents bituminous application, and so on.
[0009] So not necessarily only the spray of a stick substance as disclosed in said patent.
[0010] Scope of the present invention is to allow the machine to explicate a more wide operation
activity that can include the method above-mentioned or different, having the possibility
to utilize said means for other scopes as said to spray or jet a fluid on a road paving
before of said carpet distribution enlarging and compacting means In order to make
possible to operate the spray-jet means at different advancing speed with constant
superficial treatment and with different asphalt carpet width distribution.
[0011] This and other scopes are reached with the present invention as claimed, by means
of a self-propelled or towed automatic asphalt paver finishing machine for roads and
other paved areas involving rearward enlargeable and adjustable in height, asphalt
layer distribution means for the distribution in uniform way and compacting of at
least one stratum of asphalt, characterized in that before said asphalt layer distribution
means are disposed spray-jet means to jet fluid substances on the road surface that
are independently adjustable in height from the successive asphalt layer distribution
means.
[0012] With this solution it is possible to vary the height of the spray-jet, in function
of the pressure variation of the jet to the scopes to maintain constant wrap it of
jet that invests the treating surface.
[0013] Advantageously said spray-jet means are enlargeable by means of at least two spray
sets transversely disposed and operatively downwards oriented mounted on displacement
cross means, to move from a reunited substantially central position to a position
substantially more or less externally enlarged in opposition in order to cover different
road width surface in conformity at least to the prearranged width in said asphalt
carpet enlargeable distribution means.
[0014] With this solution we obtain also the evident advantages to apply any fluid (also
air jets) to wash or to clean or also to pre-treat the road surface before the deposition
of the bituminous stratum, in different widths. The invention is better understood
with the joined description and data supplied for example only, in which:
Figure 1 represents a schematic side view of the finishing-machine (paver) according
to invention.
Figure 2 represents a schematic side view of the rear pavement finishing device according
to invention.
Figure 3 represents a schematic top view of the rear pavement finishing device according
to invention in restricted minimum widening position.
Figure 4 represents a schematic top view of the rear pavement finishing device according
to invention in extended maximum widening position.
Figure 5 represents a perspective schematic view of the disposition of the two movable
spray-jet sets.
Figures 6 and 7 represent two schematic view of the spray-jet amplitude and respective
different high of the spray-jet nozzles from the road surface in proportion of different
advancing speed.
[0015] The Figures disclose that the invention regards a self-propelled or towed paver finishing-machine
involving rearward adjustable means in enlargeable height (B), for the distribution
in uniform way of at least one stratum of asphalt or similar bituminous concrete and
its compacting, involving upwards of said asphalt layer enlargeable distribution and
compacting means (B), spray means or jet means to spray fluids substances on the road
surface (A), these means being adjustable in height by dynamic-fluid (cylinder) independent
device (7). Said spray means of fluids substances (A) include at least two sprayer
sets (1,1') transversely disposed with downwards oriented nozzles mounted on displaceable
means, to be transversely extended on opposed side from a reunited substantially central
position (Fig.3) to a substantially side extended more or less wider position (Fig.4)
in order to cover a different width of road surface in conformity at least of the
prearranged width in said asphalt carpet enlargeable distribution finishing compacting
means (B). Advantageously said sprayers means are transversely extendable to form
a continuous crossing spray lines.
[0016] In one alternative solution said sprayers means (1,1') are alternatively transversely
movable.
[0017] Advantageously said spray means for the fluid road coating or wetting, include also
a central device with alternatively transversely movable sprayer means (2).
[0018] Said spray central device is orientated to extend the spray at least longitudinally.
[0019] Advantageously in reduced widening the sprayers in interference are excluded by well
known means, avoiding with this wetting unevenness. For the same reason, because the
machine can advance at different speed we would have with spray flow constancy a different
superficial wetting level of the road.
[0020] To obviate to this drawback according to invention the spray flow is varied in function
of the speed of advancement varying correspondingly the delivery pressure.
[0021] It is however known for scientific principle that increasing the delivery pressure
the spray jet widens consequently gives a distribution unevenness with layers overlap.
[0022] For this reason according to invention the sprayer device is also adjustable in height.
[0023] Figures 6 and 7 disclose that with V1 speed of advancement we have for example, with
a pressure p1, a spray angle ;8, consequently in order to obtain a spray amplitude
"D" on the road surface, we distance the sprayer at a height H from the road surface
in proportion.
[0024] If we change the speed of advancement to V2>V1, to increase the flow we have to increase
the delivery pressure proportionally to p2 and consequently the spray amplitude {31
becomes of greater angle, consequently to maintain constant the spray amplitude (spray
band) on the road and to avoid spray overlaps, we lower the sprayer to a level h<H.
[0025] For what concerns instead the oscillating of the sprayers as for example central
sprayer or other if prearranged, in order to have a superficial constancy of the treatment,
the oscillation frequency of the oscillation device is variable in direct proportion
to the variation of the advancing speed. Said asphalt layer enlargeable distribution
and compacting means (B) are adjustable in height by means of lateral arms (6) ) and
involve asphalt bidirectional distribution coclea means (clockwise-counterclockwise)
acting as divaricators (3) transversely extendable in opposition (3') and rearward
are disposed asphalt layer roller compacting means (vibrators, rolls Etc), involving
central compacting means of minimum fixed width (4) to compact a restricted central
band road area surface and rear, two transversely movable in opposition compacting
means to enlarge and compact the carpet in the opposed sides in larger with then the
width of the machine (5).
[0026] The machine includes furthermore to assist the spray system:
- tank for the storage of a fluid of 3000 liters;
- spray circuit with volumetric control and regulation of the spray pressure;
- auxiliary cleanness circuit and compressed air jet means;
- heating circuit to heat the main spray circuit.
[0027] With this system it is possible to spray fluids upwards of the deposition of the
stratum of conglomerate with variable dosages from 500 to 1000 grammes/m2, in uniform
way, deprived of overlaps or discontinuity in the speed range of the machine between
4 and 12 meters/min., with spray width (and successive asphalt layer stretching )
from 2,5 and 4,80 meters or with the prolongations addition between 3,7 and 6 meters.
1. A self-propelled or towed automatic asphalt paver finishing machine for roads and
other paved areas involving rearward enlargeable and adjustable in height, asphalt
layer distribution means (B) for the distribution in uniform way and compacting of
at least one stratum of asphalt, characterized in that before said asphalt layer distribution
means are disposed spray-jet means to jet fluid substances on the road surface (A)
that are independently adjustable in height (7) from the successive asphalt layer
distribution means (B,6).
2. A paver finishing-machine according to claim 1, characterized in that said spray-jet
means (A) are enlargeable in width.
3. A paver finishing-machine according to claim 1, characterized in that said spray-jet
means (A) include at least two spray sets (1,1') transversely disposed and operatively
downwards oriented, placed on displacement cross means, to move from a reunited substantially
central position (Fig.3) to a position substantially more or less externally enlarged
in opposition (Fig.4) in order to cover a different width road surface (B).
4. A paver finishing-machine according to claims 1 and 3 characterized in that it
comprises command means and operators devices such that when said spray-jet means
are reentered in interference on respective spray band, exclude for the respective
spraying action of the superfluous sprayers.
5. A paver finishing-machine according to claim 1, characterized in that said spray-jet
means are transversely extended to form a continuous spray cross line.
6. A paver finishing-machine according to claim 1, characterized in that said spray-jet
means (1,1') are alternatively transversely movable.
7. A paver finishing-machine according to claim 1, characterized in that said spray-jet
means include also a central spry-jet device alternatively transversely movable (2).
8. A paver finishing-machine according to claim 1, characterized in that said spray-jet
means include also a central spry device alternatively transversely movable (2) and
orientated to extend the spray-jet at least longitudinally.
9. A paver finishing-machine according to claim 1, characterized in that the oscillation
device of said spray-jet means includes devices and command means such to make possible
the variation of the respective oscillation frequency in direct proportion to the
variation of the speed of advancement of the machine.
10. A paver finishing-machine according to claim 1, characterized in that said enlargeable
distribution means and rear compacting layer asphalt means (B) adjustable in height
(6,7) involve asphalt layer distribution means with bidirectional right-left cochlea
divaricator (3) transversely in opposition extendible (3') and rearward compacting-rolling
means, involving a central compacting means of minimum fixed width (4) for the compacting
of the standard minimum central band and two opposite transversely movable extensions
to compact the respective side extension bands (5).