CA1073723A - Asphalt pavement recycling apparatus - Google Patents
Asphalt pavement recycling apparatusInfo
- Publication number
- CA1073723A CA1073723A CA313,711A CA313711A CA1073723A CA 1073723 A CA1073723 A CA 1073723A CA 313711 A CA313711 A CA 313711A CA 1073723 A CA1073723 A CA 1073723A
- Authority
- CA
- Canada
- Prior art keywords
- screed
- bottom plate
- roadway
- front edge
- augers
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Abstract
Abstract of the Disclosure Disclosed is a method and apparatus for recycling asphalt concrete roadways by adding little or no new hot mix to the recycled surface. The apparatus includes means for heating the roadway and applying emulsified asphalt thereto prior to scarifying the heated surface. The surface is then scarified so as to loosen the heated asphalt. The scarified material is then treated with asphalt and, if desired, a rejuvenating agent. They are mixed thoroughly to form a hot mix of asphalt concrete from the old road material.
The rejuvenated hot mix is leveled by means of screws and then compacted substantially by a vibrating screed. The screed has a continuous bottom plate and a plurality of relatively movable upper sections which are connected by turnbuckles adapted to be adjusted for bending the bottom plate of the screed to conform to the contour of the road crown. Final compaction of the road surface is obtained by rollers.
The rejuvenated hot mix is leveled by means of screws and then compacted substantially by a vibrating screed. The screed has a continuous bottom plate and a plurality of relatively movable upper sections which are connected by turnbuckles adapted to be adjusted for bending the bottom plate of the screed to conform to the contour of the road crown. Final compaction of the road surface is obtained by rollers.
Description
This Application is a Division o~ Canadian Patent Application 263,260, ~iled October 13,1976.
This invention relates generally to roadway rcsurfacing apparatus, and more particularly to new and improved asphalt concrete recycling methods and apparatus for rejuvenation of old roadway surfaces which require little or no new asphalt concrete hot mix material to be added to the process.
Accordingly, this invention deals with substantial improvements in the form-ing and handling of rejuvenated roadway surfaces during road repaving operations. ~-Road resurfacing apparatus, in general, as set forth in Cutler United States Patent No. 3,361,042, provides means for quickly and inexpen- ~-ively resurfacing roadways made o asphalt concrete material. The si~e of the apparatus disclosed therein is on the order of about eight to ten feet wide and approximately forty to fifty fee~ long and is intended to move along the roadway at a slow rate of speed so that during a single continuous pass, the old road surface is excavated and combined with additional hot mix to form a new road surface. During the conversion of the old road surface to the new road surface, substantial amounts of new asphalt concrete mixtures are required to be added to excavated material. This is to compensate for missing material as a result of pot holes in the road and to provide a thicker road surface.
While this method of resurfacing roads comprises a substantial improvement, it does require an extensive source of new hot mlx of asphalt concrete during the resurfacing operation. Also the new road surface is raised one or more inches and therefore requires that gutters and shoulders along the sides of the road be elevated for proper drainage and road safety.
Another problem with prior art road resurfacing ap~aratus is that ; the leading edge of the leveling screed is subjected to a relatively high ., ..... . . . ........................................ ~ , ~ .
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degree of wear. In many cases the upwardly turned leading edge of the screed wears through, thereby allowing the hot mix of asphalt concrete to enter the interior of the screed. When this happens the new road surface is not leveled and compacted properly and the screed must be replaced. Therefore, the road resurfacing operation must stop for a relatively long period of time while the entire screed is replaced.
The parent of this application is direc~ed to a method of and an apparatus for restoring an asphalt roadway.
According to one aspectJ the invention of this application provides a screed structure for use in apparatus of the type described comprising a bottom plate member engageable with a surface to be processed, a front edge member adjustably fixed along a forward edge of said plate member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement with a surface being processed.
According to another aspect of the invention there is provided a `~
material mixing and spreading apparatus for use on a roadway processing vehicle movable in a predetermined direction comprising support frame means, a plurality of augers rotatably mounted on said support frame means and extend-ing transversely of said direction of movement for engaging and transversely moving loose material on a roadway surface, and blade means immediately ad~a-cent and behind certain of said augers for engaging and retaining a portion of the loose material in association with said certain of said augers for promoting mixing and transverse movement of said portion of loose material, and other augers being located behind said blade means for promoting spreading of the loosened material over the roadway, and a screed structure comprising a bottom plate member engageable with the spread, loosened material, a front r :: . :. , : ' .. , . . .. . . :
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edge member adjustably fixed along a forward edge of said pla~e member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement .
wi~h the spread, loosened material. :
According to a further aspect the invention provides apparatus for restoring a roadway, comprising means for excavating the roadway surface, means for applying a quantity of asphalt to the excavated heated surface to form a rejuvenated asphalt mix~ and vibrating screed means for compacting the reju- -venated asphalt mix, said vibrating screed means including a bottom plate member engageable with the rejuvenated asphalt mix~ a front edge member adjust-ably fixed along a forward edge of said plate member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface .~ portions selectively to be presented for engagement with the rejuvenated asphalt ~:
mix, the screed means further including a yieldable bottom plate, and means for flexing the yieldable bottom plate in accordance with the radius of curvature of the road surface being restored to form a crown for the road surface. ~.
In the accompanying drawings, which illustrate exemplary embodiments of the present invention:
FIGURE 1 is a side elevational view schematically showing the various work stations and steps of operation of a road resurfacing apparatus;
FIGURE 2 is a top view of the schematic showing of FIGURE l; ~
FIGURE 3 is a side elevational view of a road recycling machine .
wherein the various work stations shown schematically in FIGURES 1 and 2 are ~-located~
FIGURE 4 is a top view of a mixer and leveler apparatus constructed in accordance with one aspect of this invention and located within the machine - ~_ 3 _ ' t','~
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lVq3723 of EI~URE 3;
FIGURE 5 is a side view of the mixer and leveler apparakus of FIGURE 4;
FIGURE 6 is a sectional view taken substantially in the plane of line 6-6 in FIGURE 4;
FIGURE 7 is a sectional view taken substantially in the plane of line 7-7 in FIGURE 6;
FIGURE 8 is a perspective view of a leveling screed which is con-structed in accordance with other aspects of this invention;
FIGURE 9 is a top view of the screed;
PIGURE 10 is a front view of the screed;
FIGUR 11 is an end view of the screed;
FIGURE 12 is a top view showing in schematic form another embodiment , ,'l.,`l - 3a -.;. . . .
1 ~ ~3 o~ th~ invention; and ~IGURE 13 is a side elevational view of the schematic showing of FIGURE 12.
Referring now to PIGURES 1 and 2, there is seen a schemat~c arrange-ment of the work stations associated with a road repaving machine which is designated generally by reference numeral 10. The road repaving machine 10 includes a pair of spaced-apart radiant heating units 12 and 14 located near the front end thereof to provide heating of the pavement surface 16. The radiant heating units 12 and 14 are operated by a fuel mixture comprising propane and air of the appropriate proportions. The propane-air fuel mixture is applied to a plurality of radiant heating burners or elements within the units to generate uniform radiant rays over the area covered by the heating units. These rays are directed toward the black asphalt cement of the pave-ment surface 16, and penetra~e to a depth of between one to three inches without burning the asphalt cement or polluting the surrounding atmosphere.
., l~e radiant heating units 12 and 14, as well as the radiant heating burners mounted therein, can be constructed substantially as set for~h in my earlier , Patent No. 3,g65,098 which issued February 11, 1975.
; The direction of travel of the road repaving machlne 10 is indicated by an arrowed line designated by reference numeral 18. Immediately follo~ing the heating operation of the pavement surface by the radiant heat of the units 12 and 14, a quantity of asphalt may be applied to the heated pavement surface by means of a plurality of spaced-apart nozzles 20, i-f desired or if road conditions require. Thus a thin film of asphalt is applied to particles which are to be excavated from the road surface for forming a rejuvenated hot mix.
The excava~,ion of the road surface is accomplished by scarifying blades 21 which are located at a scar~fying statlon 22 of the road repaving - 4 _ ,~
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apparatus 10. Preferably, the scarifying blades 21 are urged against the road surface by means of air-operated bags which apply pressure to scarifying blade holding arms 23. The scarifying blades 21 excavate the heated and coated road surface to a depth of between one-half inch to three inches~ and preferably in the order of about 3/4 inch to 1~ inches. The scarifying blades 21 can be carbide tipped for maximum wear resistance. The scarifying blade and air bag operating controls are described and illustrated in Cutler United States Patent No. 3,907,~50, dated September 23, 1975.
Immediately following the excavation of the road surface by the scarifying blades 21, a second quantity of emulsified or heated asphalt is applied to the now loose and heated surface. This asphalt, sometimes commonly referred to as liquid asphalt, restores the adhesion property of the asphalt aggregate which i5 to be recombined ~o form ~he reclaimed or rejuvenated hot mix for the road surface. The asphalt is applied to the excavated by means of a plurality of rotating liquid dispensers 24 which are immediately behind the scarifying blades 21. Preferably the dispensers 24 receive liquid asphalt from the same container as the nozzles 20.
A quantity of rejuvenator llquid is also applied to the excavated asphal~ ma~erial by means of a plurality of rotating dispensers 28. The rejuvenator liquid restores the flexibility to the asphalt concrete mlx.
The combination of the excavated road surface together with the liquid asphalt and the rejuvenator liquid provides a hot mix of asphalt material with con-forms substantially to the charac~eristics of the new hot mix normally used for paving and repaving roadways. ThereforeJ the asphalt concrete repaving apparatus 10 substantially completely eliminates the need to add large amounts of new hot mix asphalt concrete material to the road surface when repaving or rejuvenating such road surfaces.
If a quantity of new hot mix asphalt concrete is required or "`'' .
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desired, it is supplied at the work station designated generally by reference numeral 30 which is located immediatel~ following the rejuvenating applicat-ors 28. The work s~ation 30 receives a new quantity of hot mix from the side of the repaving machine 10 by means of a dump truck which is designated generally by reference numeral 32 which applies the new hot mix asphalt con-crete material therein to a portable conveyor 36. The conveyor 36 moves the material in the direction indicated by an arrow 38 in FIGURE 2 to the work station 30. Also at the work station 30 a quantity of anti-skid chips may be added to the reclaimed hot mix if desired. The conveyor 36 may be carried by the truck 32 or it may be moved manually on its own wheels.
rmmediately following the formation of the rejuvenated hot mix and the addition of any new hot mixJ the material is further mixed and leveled by a pair of mixing screws 40 and 41 which traverse the rejuvenated hot mix first in the direction indicated by arrow 42 and then in the direction indicated b~ arrow 43. Associated with each o~ the mixing screws are le~el-ing blade 44 and 46 resp~ctively. The newly formed rejuvenated hot mix (together with whatever small amounts of new ho~ mix have been added~ is thoroughl~ mixed to comblne the loosened aggregate and the liquid asphalt and rejuvenator. This operation is followed by a second pair of mixlng and spreading screws 48 and 50 which move the reclaimed hot mix first in the dir-ection indicated by arrow 51 and then in the direction indicated by arrow 52.
This operation uniformly disperses the reclaimed hot mix together wit~ what-; ever new hot mix has been added. If necessary, additional heat is applied to the mix ~y~means of a plurality of independent heating units 54 which enable the material to be more easily compacted and shaped by means of a formable vibrating screed 56.
The screed 56 is formed of a plurality of sections 56a, 56b, 56c and 56d. These sections are interconnec~ed by turnbuckles and rods, to be . ' i . .
:.
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lV73723 described in greater detail hereInbelow. These turnbuckles and rods enable the lower sur~ace 58 of the screed to be shaped in conformity ~ith the contour of the road surface being formed. Most advantageously, the vibrating screed compacts the reclaimed, rejuvenated, hot mix to a compaction of more than 85%. However, it will be understood that the degree of compaction achieved at this work station can vary widel~ without departing from the spirit and scope of the novel concepts of this invention.
If desired, the road surface may be provided with a scattered single layer of coated lightweight nonskid synthetic aggregate. This aggregate material is dispensed from a hopper and spreader 62 over the substantially completely compacted road surface. The amount of coated chips applied to the newly formed road surface may be in the order of about three pounds of aggregate chips per square yard of road surface. However, other amounts may be dispensed if desired. The road surface is ultimately compacted by a roller vehicle 64 which applies substantial weight per unit area of road surface to achieve 100% compaction of the newly rejuvenated asphalt concrete material.
Referring now to ~IGURE 3, there is seen a side elevational view of a road repaving machine whereln the plurality of work stations illustrated schematically in FIGURES 1 and 2 are located. The repaving machine 10 has the forward burner 12 separated from the second or rearmost burner 14 by wheels 70 and associated undercarriage structure of the repaving apparatus.
The wheels 70 are steerable by hydraulic steering means from a central operat-ing station 71. Also, if desired, the area between the wheels 70 may include scarifying apparatus ~not shown) to perform an ini~ial excavation in the road surface before the second heater 14 applies radiant heat thereto. The heating units 12 and 14 include a plurality of exhaust stack~ 72 and 73, respectively, through which the products of combustion from the burners are expelled.
The road repaving apparatus 10 includes a rear lower ~rame structure , . .
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78 which supports the mixing and 10veling screws ~0, ~1, 48 and 50. Also at the end of the support frame 78 is secured the compacting vibrating screed 56. The road repaving machine 10 also includes a pluralit~ of csntainers 79 for supplying liquid such as diesel fuel for diesel engines used to power the machine, propane fuel for burners 12 and 14, water for cooling various com--~ ponents of the apparatus when necessary, liquid asphalt and rejuvenating materials.
Referring now to FIGURES 3, 4 and 5, there is seen the details of construction of the leveling and mixing screws 40, 41, 48 and 50. Also some of the details of the support frame 78 are shown. The support frame 78 includes an elongated fixed member 80 secured to the chassis of the repaving apparatus which is indicated generall~ b~ the reference numeral 81. The member 80 is pivotall~ secured to the chassis 81 by a pin means 82 or other suitable fastening means. An associated member 84 is adjustable relative to t~e member 80 and includes means for adjusting the relative positions of the mixing screws 40 and 41 and with the associated back-up blades 44 and 46.
The mixing screw 40 is journalled at its ends b~ bearing means 87 which may ~e secured to a flange or other suitable means 88. Similarly, the mixing screw 41 is journalled by bearing means 89 secured within a flange
This invention relates generally to roadway rcsurfacing apparatus, and more particularly to new and improved asphalt concrete recycling methods and apparatus for rejuvenation of old roadway surfaces which require little or no new asphalt concrete hot mix material to be added to the process.
Accordingly, this invention deals with substantial improvements in the form-ing and handling of rejuvenated roadway surfaces during road repaving operations. ~-Road resurfacing apparatus, in general, as set forth in Cutler United States Patent No. 3,361,042, provides means for quickly and inexpen- ~-ively resurfacing roadways made o asphalt concrete material. The si~e of the apparatus disclosed therein is on the order of about eight to ten feet wide and approximately forty to fifty fee~ long and is intended to move along the roadway at a slow rate of speed so that during a single continuous pass, the old road surface is excavated and combined with additional hot mix to form a new road surface. During the conversion of the old road surface to the new road surface, substantial amounts of new asphalt concrete mixtures are required to be added to excavated material. This is to compensate for missing material as a result of pot holes in the road and to provide a thicker road surface.
While this method of resurfacing roads comprises a substantial improvement, it does require an extensive source of new hot mlx of asphalt concrete during the resurfacing operation. Also the new road surface is raised one or more inches and therefore requires that gutters and shoulders along the sides of the road be elevated for proper drainage and road safety.
Another problem with prior art road resurfacing ap~aratus is that ; the leading edge of the leveling screed is subjected to a relatively high ., ..... . . . ........................................ ~ , ~ .
, .. ~ .
.
7 3'~
degree of wear. In many cases the upwardly turned leading edge of the screed wears through, thereby allowing the hot mix of asphalt concrete to enter the interior of the screed. When this happens the new road surface is not leveled and compacted properly and the screed must be replaced. Therefore, the road resurfacing operation must stop for a relatively long period of time while the entire screed is replaced.
The parent of this application is direc~ed to a method of and an apparatus for restoring an asphalt roadway.
According to one aspectJ the invention of this application provides a screed structure for use in apparatus of the type described comprising a bottom plate member engageable with a surface to be processed, a front edge member adjustably fixed along a forward edge of said plate member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement with a surface being processed.
According to another aspect of the invention there is provided a `~
material mixing and spreading apparatus for use on a roadway processing vehicle movable in a predetermined direction comprising support frame means, a plurality of augers rotatably mounted on said support frame means and extend-ing transversely of said direction of movement for engaging and transversely moving loose material on a roadway surface, and blade means immediately ad~a-cent and behind certain of said augers for engaging and retaining a portion of the loose material in association with said certain of said augers for promoting mixing and transverse movement of said portion of loose material, and other augers being located behind said blade means for promoting spreading of the loosened material over the roadway, and a screed structure comprising a bottom plate member engageable with the spread, loosened material, a front r :: . :. , : ' .. , . . .. . . :
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edge member adjustably fixed along a forward edge of said pla~e member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement .
wi~h the spread, loosened material. :
According to a further aspect the invention provides apparatus for restoring a roadway, comprising means for excavating the roadway surface, means for applying a quantity of asphalt to the excavated heated surface to form a rejuvenated asphalt mix~ and vibrating screed means for compacting the reju- -venated asphalt mix, said vibrating screed means including a bottom plate member engageable with the rejuvenated asphalt mix~ a front edge member adjust-ably fixed along a forward edge of said plate member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface .~ portions selectively to be presented for engagement with the rejuvenated asphalt ~:
mix, the screed means further including a yieldable bottom plate, and means for flexing the yieldable bottom plate in accordance with the radius of curvature of the road surface being restored to form a crown for the road surface. ~.
In the accompanying drawings, which illustrate exemplary embodiments of the present invention:
FIGURE 1 is a side elevational view schematically showing the various work stations and steps of operation of a road resurfacing apparatus;
FIGURE 2 is a top view of the schematic showing of FIGURE l; ~
FIGURE 3 is a side elevational view of a road recycling machine .
wherein the various work stations shown schematically in FIGURES 1 and 2 are ~-located~
FIGURE 4 is a top view of a mixer and leveler apparatus constructed in accordance with one aspect of this invention and located within the machine - ~_ 3 _ ' t','~
:, ~ . ,. . _ . , ~ . .
. .
.. .. .. . .
lVq3723 of EI~URE 3;
FIGURE 5 is a side view of the mixer and leveler apparakus of FIGURE 4;
FIGURE 6 is a sectional view taken substantially in the plane of line 6-6 in FIGURE 4;
FIGURE 7 is a sectional view taken substantially in the plane of line 7-7 in FIGURE 6;
FIGURE 8 is a perspective view of a leveling screed which is con-structed in accordance with other aspects of this invention;
FIGURE 9 is a top view of the screed;
PIGURE 10 is a front view of the screed;
FIGUR 11 is an end view of the screed;
FIGURE 12 is a top view showing in schematic form another embodiment , ,'l.,`l - 3a -.;. . . .
1 ~ ~3 o~ th~ invention; and ~IGURE 13 is a side elevational view of the schematic showing of FIGURE 12.
Referring now to PIGURES 1 and 2, there is seen a schemat~c arrange-ment of the work stations associated with a road repaving machine which is designated generally by reference numeral 10. The road repaving machine 10 includes a pair of spaced-apart radiant heating units 12 and 14 located near the front end thereof to provide heating of the pavement surface 16. The radiant heating units 12 and 14 are operated by a fuel mixture comprising propane and air of the appropriate proportions. The propane-air fuel mixture is applied to a plurality of radiant heating burners or elements within the units to generate uniform radiant rays over the area covered by the heating units. These rays are directed toward the black asphalt cement of the pave-ment surface 16, and penetra~e to a depth of between one to three inches without burning the asphalt cement or polluting the surrounding atmosphere.
., l~e radiant heating units 12 and 14, as well as the radiant heating burners mounted therein, can be constructed substantially as set for~h in my earlier , Patent No. 3,g65,098 which issued February 11, 1975.
; The direction of travel of the road repaving machlne 10 is indicated by an arrowed line designated by reference numeral 18. Immediately follo~ing the heating operation of the pavement surface by the radiant heat of the units 12 and 14, a quantity of asphalt may be applied to the heated pavement surface by means of a plurality of spaced-apart nozzles 20, i-f desired or if road conditions require. Thus a thin film of asphalt is applied to particles which are to be excavated from the road surface for forming a rejuvenated hot mix.
The excava~,ion of the road surface is accomplished by scarifying blades 21 which are located at a scar~fying statlon 22 of the road repaving - 4 _ ,~
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apparatus 10. Preferably, the scarifying blades 21 are urged against the road surface by means of air-operated bags which apply pressure to scarifying blade holding arms 23. The scarifying blades 21 excavate the heated and coated road surface to a depth of between one-half inch to three inches~ and preferably in the order of about 3/4 inch to 1~ inches. The scarifying blades 21 can be carbide tipped for maximum wear resistance. The scarifying blade and air bag operating controls are described and illustrated in Cutler United States Patent No. 3,907,~50, dated September 23, 1975.
Immediately following the excavation of the road surface by the scarifying blades 21, a second quantity of emulsified or heated asphalt is applied to the now loose and heated surface. This asphalt, sometimes commonly referred to as liquid asphalt, restores the adhesion property of the asphalt aggregate which i5 to be recombined ~o form ~he reclaimed or rejuvenated hot mix for the road surface. The asphalt is applied to the excavated by means of a plurality of rotating liquid dispensers 24 which are immediately behind the scarifying blades 21. Preferably the dispensers 24 receive liquid asphalt from the same container as the nozzles 20.
A quantity of rejuvenator llquid is also applied to the excavated asphal~ ma~erial by means of a plurality of rotating dispensers 28. The rejuvenator liquid restores the flexibility to the asphalt concrete mlx.
The combination of the excavated road surface together with the liquid asphalt and the rejuvenator liquid provides a hot mix of asphalt material with con-forms substantially to the charac~eristics of the new hot mix normally used for paving and repaving roadways. ThereforeJ the asphalt concrete repaving apparatus 10 substantially completely eliminates the need to add large amounts of new hot mix asphalt concrete material to the road surface when repaving or rejuvenating such road surfaces.
If a quantity of new hot mix asphalt concrete is required or "`'' .
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desired, it is supplied at the work station designated generally by reference numeral 30 which is located immediatel~ following the rejuvenating applicat-ors 28. The work s~ation 30 receives a new quantity of hot mix from the side of the repaving machine 10 by means of a dump truck which is designated generally by reference numeral 32 which applies the new hot mix asphalt con-crete material therein to a portable conveyor 36. The conveyor 36 moves the material in the direction indicated by an arrow 38 in FIGURE 2 to the work station 30. Also at the work station 30 a quantity of anti-skid chips may be added to the reclaimed hot mix if desired. The conveyor 36 may be carried by the truck 32 or it may be moved manually on its own wheels.
rmmediately following the formation of the rejuvenated hot mix and the addition of any new hot mixJ the material is further mixed and leveled by a pair of mixing screws 40 and 41 which traverse the rejuvenated hot mix first in the direction indicated by arrow 42 and then in the direction indicated b~ arrow 43. Associated with each o~ the mixing screws are le~el-ing blade 44 and 46 resp~ctively. The newly formed rejuvenated hot mix (together with whatever small amounts of new ho~ mix have been added~ is thoroughl~ mixed to comblne the loosened aggregate and the liquid asphalt and rejuvenator. This operation is followed by a second pair of mixlng and spreading screws 48 and 50 which move the reclaimed hot mix first in the dir-ection indicated by arrow 51 and then in the direction indicated by arrow 52.
This operation uniformly disperses the reclaimed hot mix together wit~ what-; ever new hot mix has been added. If necessary, additional heat is applied to the mix ~y~means of a plurality of independent heating units 54 which enable the material to be more easily compacted and shaped by means of a formable vibrating screed 56.
The screed 56 is formed of a plurality of sections 56a, 56b, 56c and 56d. These sections are interconnec~ed by turnbuckles and rods, to be . ' i . .
:.
, ~ , .
lV73723 described in greater detail hereInbelow. These turnbuckles and rods enable the lower sur~ace 58 of the screed to be shaped in conformity ~ith the contour of the road surface being formed. Most advantageously, the vibrating screed compacts the reclaimed, rejuvenated, hot mix to a compaction of more than 85%. However, it will be understood that the degree of compaction achieved at this work station can vary widel~ without departing from the spirit and scope of the novel concepts of this invention.
If desired, the road surface may be provided with a scattered single layer of coated lightweight nonskid synthetic aggregate. This aggregate material is dispensed from a hopper and spreader 62 over the substantially completely compacted road surface. The amount of coated chips applied to the newly formed road surface may be in the order of about three pounds of aggregate chips per square yard of road surface. However, other amounts may be dispensed if desired. The road surface is ultimately compacted by a roller vehicle 64 which applies substantial weight per unit area of road surface to achieve 100% compaction of the newly rejuvenated asphalt concrete material.
Referring now to ~IGURE 3, there is seen a side elevational view of a road repaving machine whereln the plurality of work stations illustrated schematically in FIGURES 1 and 2 are located. The repaving machine 10 has the forward burner 12 separated from the second or rearmost burner 14 by wheels 70 and associated undercarriage structure of the repaving apparatus.
The wheels 70 are steerable by hydraulic steering means from a central operat-ing station 71. Also, if desired, the area between the wheels 70 may include scarifying apparatus ~not shown) to perform an ini~ial excavation in the road surface before the second heater 14 applies radiant heat thereto. The heating units 12 and 14 include a plurality of exhaust stack~ 72 and 73, respectively, through which the products of combustion from the burners are expelled.
The road repaving apparatus 10 includes a rear lower ~rame structure , . .
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78 which supports the mixing and 10veling screws ~0, ~1, 48 and 50. Also at the end of the support frame 78 is secured the compacting vibrating screed 56. The road repaving machine 10 also includes a pluralit~ of csntainers 79 for supplying liquid such as diesel fuel for diesel engines used to power the machine, propane fuel for burners 12 and 14, water for cooling various com--~ ponents of the apparatus when necessary, liquid asphalt and rejuvenating materials.
Referring now to FIGURES 3, 4 and 5, there is seen the details of construction of the leveling and mixing screws 40, 41, 48 and 50. Also some of the details of the support frame 78 are shown. The support frame 78 includes an elongated fixed member 80 secured to the chassis of the repaving apparatus which is indicated generall~ b~ the reference numeral 81. The member 80 is pivotall~ secured to the chassis 81 by a pin means 82 or other suitable fastening means. An associated member 84 is adjustable relative to t~e member 80 and includes means for adjusting the relative positions of the mixing screws 40 and 41 and with the associated back-up blades 44 and 46.
The mixing screw 40 is journalled at its ends b~ bearing means 87 which may ~e secured to a flange or other suitable means 88. Similarly, the mixing screw 41 is journalled by bearing means 89 secured within a flange
2~ or bearing support 90. On the other hand, both screws 48 and 50 are secured to the elongated member 80 by means of plates 91 on opposite sides of the frame structure. The plates 91 receive means for carr~ing a pair of bearings 92 and 93 for journalling the auger type mixing screws at their ends. A
leveling wheel 94 is secured to an adjustable member 96, which, in turn, is inserted into a guide 97. The adjustable member 96 includes a threaded rod 98 secured to the elongated member 80. The vertical position of the mix-ing and leveling screws 48 and 50 can be adjusted by raising and lowering the guide roller 94 b~ means of the threaded rod 98. To compensate for the cro~n '~' ..
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leveling wheel 94 is secured to an adjustable member 96, which, in turn, is inserted into a guide 97. The adjustable member 96 includes a threaded rod 98 secured to the elongated member 80. The vertical position of the mix-ing and leveling screws 48 and 50 can be adjusted by raising and lowering the guide roller 94 b~ means of the threaded rod 98. To compensate for the cro~n '~' ..
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3'YX3 or cross-s~ctional c~lrva~ure of ~he road, th~ leveling blades 44 and 46 are p~vo~ally secured to the frame ~y p~ns lOOa and lOOb, respectively.
As best seen in ~IGURF: 4, the excavated, rejuvenated hot mix is conveyed by the mixing screw 40 in the direction as indicated by the arrow 100 to an area 101 immediately in ront of the next auger mixing scr0w 41.
The auger or mixing scre~Y 41 conveys the rejuvenated hot mix in the direction of arrowed lines 102 where it leaves the scre~ in an area immediatel~ adjacent the auger screws 41 and behind the auger screw 40~ The blades 44 and 46 cause substantial amounts of the material to pile up within thelr associated auger screws to insure the desired mixing ac~ion.
As the repaving apparatus advances forward, the piled rejuvenated hot mix is then agitated and dispersed by the leveling screw 48 wherein the material directed in the direction of arrowed lines 103. The rejuvenated hot mix is again subjected to mlxing and leveling by the auger 50 which moves the material in the d~rection as indicated by arrowed lines 1040 Since there are no blades associated with the screws or augers 48 and 5Q, the pil-ing is minimized and substantial leveling i~ accompllshed.
Referring no~ to ~IGURES 4, 6 and 7, the details of construction of the forward mixing and leveling screws and associate leveling blade$ are shown. As mentioned above, the leveling auger screw 40 is journalled by a bearing 87 in a support 88. As seen in FIGURE 6, the bearing is secured to a beam 121 and extends therefrom by means of an arm 122. Preferably, location of the beam 121 can be altered by an adjusting screw 124 or the like to provide a crown control adjustment for the cross-section of the road surface.
The adjusting screw 124 may either be rotated manually or by means of an electric motor 125 operated by a suitable control circuit.
The beam 121 is pivotally secured by means of the pin lOOa Which is connected to a support frame 126 which is fixed ~o the upper support beam _ g _ '.
, ,. : : - : ..... .. . :.-:-.. :: - . ,. :, :
, : . - . . . - ., : .
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.. . .
3~'t~
sn. The ro~ating auger screw 40, toget~er with its l~vellng blad0 44, there-fore pivot about the pin lOQa by means of the adjusting screw 124. Similarly, the auger screw 41 toge~her with i~s leveling blade 46 are pivotally secured to the frame 126 by the pin lOOb which, in turn, is secured to a beam 127.
The ~eam 127J together with the associated auger screw 41 and leveling blade 46 are pivotally adjustable a~out the pin lOOb b~ an adjusting screw 130, whichalsomaybeeither manually operable or driven by a motor 131 in response to suitable control circuitry.
During machine operation, arms 141 and 142 (FIGURE 7) enable the associated beams 121 and 127 to move upwardly and downwardly in response to action of the adjusting screws 124 and 130. Also, the arms 141 and 142 pro-vide a back-up support for the leveling blades 44 and 46 as the~ are urged against the mass of rejuvenated hot mix asphalt concrete material. ~hile a single specific embodiment is illustrated herein for providing cro~n control of the rejuvenated hot mix formed b~ the repaving machine of this invention, it ~11 be understood that other suita~le crown control means can ~e incorpOr-ated if desired.
Each section 56a - 56d of t~e screed 56 includes an initial leading edge member formed by a hollow pipe 106 which is secured to the screed bod~
2Q designated generall~ by reference numeral 107, as shown in FIGURES 4, 5 and 8-11 inclusive. The screed body 107 includes a bottom plate 108 extending the width of the screed and U-shaped upper members 109 forming front, rear and top walls for each of the sections 56a - 56d. As shown in FIGURE 5, the screed 56 is urged downwardly by means of an adjusting screw 110 which engages a threaded coupling 111 extending from the elongated member 8~. A hand crank 112 is provided for adjusting the level of the screed as well as the amount of pressure or force transferred from the elongated member 8~ to the screed for compacting the newl~ laid road surface. The screed 56 includes standing , .
: : , . .:
:,"'~ . ~ ' ': ' , : ~,- , : ' , : . .
:: . ~ . . . . .
. ~ .
3';'Z;3 walks or platforms 113, 114, 115 and 116 associated with the sections 56a, 56b, 56c and 56d, respectively. The standing platforms enable workmen to stand immediately behind the screed and operate the adjusting screws 110 and other equipment to insure thak a uniform road surface is formed. Also, it will be noted that the pipe 106 forming the leading edge ~f each screed sec-tion is heated by the heating apparatus 54 to insure that the hot mix is sufficiently flowable under pressure to facilitate compacting of the material.
Referring more particularly to FIGURES 8-11, there are seen the details of construction of the screed 56 utilized in the road repaving appar-atus 10. The leveling screed 56 is adjustable along its width to provide an arcuate surface configuration for conforming to the crown of the road as f~rmed initially by the leveling blades 44 and 46. The screed is vibrated by a plurality of motor driven vibrators 160, 161, 162, 163, 164 and 165. Each vibrator 160 - 165 preferably rotates in a direction opposite to that of the adjacent vibrators. For example, the vibrators 160, 162 and 164 may rotate --in a clockwise direction while vibrators 161, 163 and 165 may rotate in a counter-clockwise direction, when viewing the screed from the rear of the apparatus.
A heating chamber 167 is provided immediately over the pipe leading 2Q edge 106 of the screed and wherein the plurality of heating units 54, FIGURES
1 and 2, are located. The heating chamber 167 has a pair of exhaust stacks 168 and 169 extending upwardly therefrom to remove the products of combustion.
Preferably, the heating units are of the radiant heating type similar to those utilized in the heating units 12 and 14 and disclosed in Cutler United States ;
Patent No. 3,685,098.
The ends of the screed include socket structures 170 and 171 to receive adjusting screws similar to the adjusting screw 110 illustrated in PIGURE 5. As best seen in PIGURES 9 and 10, the screed sections 56a - 56~
are disposed in closely adjacent side-by-side relatlonships ~or bracing the ,, .
' . , ~ , ' , ;: ' -- ; .: ~ ' ~ ,' :
., ' ~:
3~
bottom plate 108 and disposing it in a desired road surface-forming shape.
The section 56a includes a pair of vibrakor mounting brackets 176 and the section 56b includes a pair of vibrator mounting brackets 177. Similarly, the section 56c includes vibrator mounting brackets 178 and the section 56d includes vibrator mounting brackets 179. While only four sections and four pairs of mounting brackets are shown in FIGURES 9 and 10, it will be under-stood that six vibrators can be incorporated as showrl in the perspective view of FIGURE 8. Also it will be understood that an~ number of sections similar to the sections 56a - 56d can be incorporated, this varying from, for example3 10 four to eight sections, depending on the width of the road repaving apparatus.
The section 56a has a pair of access plates 180 and 181 secured over access apertures in its top member lO9 by lock ~abs and bolts indicated generally ; by reference numeral 182. The sections 56b - 56d have similar pairs of access plates 183 and 184, 187 and 188 and 190 and 191, secured over openings in their top members 107 by means of lock similar tabs and bolts.
As explained above, the sections 56a - 56d are adjustable relative to one another and the plate 108 is sufficiently flexible to allow the sect-ions to be relatively pivotable about axes between th sections indicated by reference numerals 200, 201 and 202. This enables the screed plate 108 to 20 be adjustably curved or arched so as to conform to the desired crown of the ~oad surface.
To adjust the section positionsJ the sections 56a and 56b are tied together at their upper ends by turnbuckle means 204 which extends bet~een a pair of upstanding plates 206 and 207 on the sections 56a and 56bJ respective-ly. The turnbuckle means 204 includes forward and rear turnbuckle elements 204a and 204b, as seen in FIGURE 8, which are coupled by a drive chain 209 which can be either manually or automatically driven to rotate the turnbuckles 204a and 204b simultaneously so as to effect uniform flexure of the forward : , : , : : . : :: . : -- , , :
.
. .
::
, 1 ~ ~ 3'~ ~
and rear portions of the sections 56a and 56b.
Sections 56b and 56c are adjustably connected by turnbuckle means 210 extending between upstanding plates 211 and 212. The turnbuckle means 210 also includes a forward turnbuckle 210a and a rear turnbuckle 210b, as seen in FIGURE 8, and these turnbuckles are tied together by a common drive chain and sprocket arrangement indicated generally by reference numeral 213.
The sections 56c and 56d are also adjustably secured together by additional turnbuckle means 216 mounted between upstanding plates 217 and 218. The turnbuckle means 216 includes a forward turnbuckle 216a and a rear turnbuckle ~ 10 216b tied together by a chain and sprocket arrangement 220.
; The details of only one of the turnbuckles will be set forth herein, it being understood that the turnbuckles are all constructed in substantially the same manner. The turnbuckle 216a includes a pair of thread-ed shafts 221 and 222 extending from a threaded body 223. The shafts 221 and 222 are secured to brackets 226 and 227, respectively, moun~ed at the top ends of the plates 217 and 218. The brackets 226 and 227 preferably are welded in position. Thethreaded member 223 has fixed to it a sprocket 229 engaging a chain to form the sprocket and chain adjusting arrangement 220. By operating this turnbuckle, the plate 108 is flexed about the axes 200, 201 and 202 to obtain the desired curvature.
The leading edge of screed 56 is formed by the aforementioned pipe or edge member 106, which, as seen in FIGU~E 10 comprises separate sections 106a, 106b; 106c and 106d respectively incorporated in the screed sectîons 56a - 56d. As seen in FUGURE 11, the pipe sections 106a - 106d are secured to the screed sections by bolts 240 which engage threaded ap0rtures 242, 243, respectively, formed within the pipe. A second set of threaded apertures 244 and 246 are formed diamekrically opposed from the apertures 24~ and 241, respectively. This enables the pipe or edge member sections to be removed ., :
: :
~ . :
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from the position shown in the drawlngs, rotated 90, and then resecured in a position at the leading edge of the screed. In this instance, the pipe would be secured by the threaded apertures 242 and 244 when rotated counter-clockwise 90, or secured by threaded apertures 242 and 246 when rotated clock-wise 90. Thus, the pipe is capable of providing multiple wear surfaces for engaging the abrasive asphalt concrete material as the repaving machine passes over the road surface. For example, the quadrant designated by refer-ence numeral 247 is the wear surface presently disposed for engaging the asphalt concrete material during the repaving operation. However, when the quadrant 247 is substantially worn, the pipe edge member can be moved and rotated to expose a new quadran~ 248. Similarly, when this wear surface is depleted, the pipe or edge member may again be rotated to expose another new wear surface 249. Finally, a last wear surface 250 may be put into operation by again rotating the pipe. The screed 56 therefore provides a multiple ~ear surface device at the leading edge of the screed complacting plate or bottom wall 108.
An alternate embodiment is illustrated in FIGURES 12 and 13. Here a machine 310 includes preliminary heaters 312 and 314 like those described in connection with FIGURES 1-3. Nozzles ~not sho~n~ can be included if de$ir-ed to appl~ a preliminary coating of liquid asphalt to the heated pa~ement if desired or if road conditions require. These nozzles can be conveniently located between the heaters 312 and 314 or behind the second heater 314.
Scarifying blades 321~ mounted at a scarifying station 322 are urged against the road surface by air operating bags 323 which apply pressure to scarifying ; blade holding arms 324. As noted above, the scarifying blades and air bag operating controls are described and illustrated in Cutler United States patent No. 3,907,450, dated September 23, 1975.
Behind these scarifying blades 321 are windrowing augers 330 and .: .
: ,- , :
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331 ~h~ch are arranged and rotated so as to conve~ the now-loosened and scarified materIal toward t~e cent~r of the machlne travel path as indicated by the arrows 332 and 333 in ~IGURE 12. slades 335 and 336 mounted behind the augers 330 and 331 respectively assist in presenting scarified material to the augers for this centralized movement. Behind the augers 330, 331 and and blades 335, 336, liquid dispensers 340 and 341 apply hot liquid asphalt ` and any desired rejuvenating agent to the scarified and now relatively denuded remaining highway surface. These dispensers can be arranged, if desired, to also add asphalt to the scarified and windrowed material.
At the front or any other convenient location upon the machine 310, a receiving hopper 350 is located to receive a quantity of hot mix 351 from a supply 352 in a truck 354 or other delivering unit. This hot mix 351 is conveyed from the receiving hopper 350, as by a conveyor 355, to a delivery and dispersing position 356. At this position, the newly delivered hot mix 351 is deposited atop the ma~erial scarified and windrvwed by the blades 321 - and augers 330, 331. An agitator device 360, here comprising a series of pug-mill paddles 361 and an associated backup plate 362, agitates and intermingles ~ , this newly delivered hot mix 351 and old road material to provide a new road- -forming composition. If desired, this paddle wheel 360 can be formed so ` 20 as to provide a spreading action to the composition as indicated by the arrows 365 and 366.
Behind the agitating paddle wheel 360, additional spreader augers 370 and 371 are oriented and are rotated so as to further spread and level the new composition as indicated by the arrows 372 and 373. ~ screed mechanism 380, which can be of the type described above, is provided to level ; and preliminarily compact this composition into a new road surface. ~aterial spreaders 385 and 386 can be provided to scatter a layer of nonskid synthetic aggregate atop the new road surface. It will be understood that a roller : ~ ~ . ., ' , , .............................. , ' : -, " '' , ~ .: : , ' .,, ' ,' - ' ' ~)73'~2~il yefiicle 388 or other compactor device can be used to achieve lOQ% of the des~red compaction ~or t~e newl~ rejuvenated asphalt concrete material and - recycled r~ad.
, ' .' ` ' ' ' ~"', " ' .'', ;' , ', , ' :, ~ :
....
, - --. . ; : . , -, . ' , . ' ' : ,
As best seen in ~IGURF: 4, the excavated, rejuvenated hot mix is conveyed by the mixing screw 40 in the direction as indicated by the arrow 100 to an area 101 immediately in ront of the next auger mixing scr0w 41.
The auger or mixing scre~Y 41 conveys the rejuvenated hot mix in the direction of arrowed lines 102 where it leaves the scre~ in an area immediatel~ adjacent the auger screws 41 and behind the auger screw 40~ The blades 44 and 46 cause substantial amounts of the material to pile up within thelr associated auger screws to insure the desired mixing ac~ion.
As the repaving apparatus advances forward, the piled rejuvenated hot mix is then agitated and dispersed by the leveling screw 48 wherein the material directed in the direction of arrowed lines 103. The rejuvenated hot mix is again subjected to mlxing and leveling by the auger 50 which moves the material in the d~rection as indicated by arrowed lines 1040 Since there are no blades associated with the screws or augers 48 and 5Q, the pil-ing is minimized and substantial leveling i~ accompllshed.
Referring no~ to ~IGURES 4, 6 and 7, the details of construction of the forward mixing and leveling screws and associate leveling blade$ are shown. As mentioned above, the leveling auger screw 40 is journalled by a bearing 87 in a support 88. As seen in FIGURE 6, the bearing is secured to a beam 121 and extends therefrom by means of an arm 122. Preferably, location of the beam 121 can be altered by an adjusting screw 124 or the like to provide a crown control adjustment for the cross-section of the road surface.
The adjusting screw 124 may either be rotated manually or by means of an electric motor 125 operated by a suitable control circuit.
The beam 121 is pivotally secured by means of the pin lOOa Which is connected to a support frame 126 which is fixed ~o the upper support beam _ g _ '.
, ,. : : - : ..... .. . :.-:-.. :: - . ,. :, :
, : . - . . . - ., : .
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sn. The ro~ating auger screw 40, toget~er with its l~vellng blad0 44, there-fore pivot about the pin lOQa by means of the adjusting screw 124. Similarly, the auger screw 41 toge~her with i~s leveling blade 46 are pivotally secured to the frame 126 by the pin lOOb which, in turn, is secured to a beam 127.
The ~eam 127J together with the associated auger screw 41 and leveling blade 46 are pivotally adjustable a~out the pin lOOb b~ an adjusting screw 130, whichalsomaybeeither manually operable or driven by a motor 131 in response to suitable control circuitry.
During machine operation, arms 141 and 142 (FIGURE 7) enable the associated beams 121 and 127 to move upwardly and downwardly in response to action of the adjusting screws 124 and 130. Also, the arms 141 and 142 pro-vide a back-up support for the leveling blades 44 and 46 as the~ are urged against the mass of rejuvenated hot mix asphalt concrete material. ~hile a single specific embodiment is illustrated herein for providing cro~n control of the rejuvenated hot mix formed b~ the repaving machine of this invention, it ~11 be understood that other suita~le crown control means can ~e incorpOr-ated if desired.
Each section 56a - 56d of t~e screed 56 includes an initial leading edge member formed by a hollow pipe 106 which is secured to the screed bod~
2Q designated generall~ by reference numeral 107, as shown in FIGURES 4, 5 and 8-11 inclusive. The screed body 107 includes a bottom plate 108 extending the width of the screed and U-shaped upper members 109 forming front, rear and top walls for each of the sections 56a - 56d. As shown in FIGURE 5, the screed 56 is urged downwardly by means of an adjusting screw 110 which engages a threaded coupling 111 extending from the elongated member 8~. A hand crank 112 is provided for adjusting the level of the screed as well as the amount of pressure or force transferred from the elongated member 8~ to the screed for compacting the newl~ laid road surface. The screed 56 includes standing , .
: : , . .:
:,"'~ . ~ ' ': ' , : ~,- , : ' , : . .
:: . ~ . . . . .
. ~ .
3';'Z;3 walks or platforms 113, 114, 115 and 116 associated with the sections 56a, 56b, 56c and 56d, respectively. The standing platforms enable workmen to stand immediately behind the screed and operate the adjusting screws 110 and other equipment to insure thak a uniform road surface is formed. Also, it will be noted that the pipe 106 forming the leading edge ~f each screed sec-tion is heated by the heating apparatus 54 to insure that the hot mix is sufficiently flowable under pressure to facilitate compacting of the material.
Referring more particularly to FIGURES 8-11, there are seen the details of construction of the screed 56 utilized in the road repaving appar-atus 10. The leveling screed 56 is adjustable along its width to provide an arcuate surface configuration for conforming to the crown of the road as f~rmed initially by the leveling blades 44 and 46. The screed is vibrated by a plurality of motor driven vibrators 160, 161, 162, 163, 164 and 165. Each vibrator 160 - 165 preferably rotates in a direction opposite to that of the adjacent vibrators. For example, the vibrators 160, 162 and 164 may rotate --in a clockwise direction while vibrators 161, 163 and 165 may rotate in a counter-clockwise direction, when viewing the screed from the rear of the apparatus.
A heating chamber 167 is provided immediately over the pipe leading 2Q edge 106 of the screed and wherein the plurality of heating units 54, FIGURES
1 and 2, are located. The heating chamber 167 has a pair of exhaust stacks 168 and 169 extending upwardly therefrom to remove the products of combustion.
Preferably, the heating units are of the radiant heating type similar to those utilized in the heating units 12 and 14 and disclosed in Cutler United States ;
Patent No. 3,685,098.
The ends of the screed include socket structures 170 and 171 to receive adjusting screws similar to the adjusting screw 110 illustrated in PIGURE 5. As best seen in PIGURES 9 and 10, the screed sections 56a - 56~
are disposed in closely adjacent side-by-side relatlonships ~or bracing the ,, .
' . , ~ , ' , ;: ' -- ; .: ~ ' ~ ,' :
., ' ~:
3~
bottom plate 108 and disposing it in a desired road surface-forming shape.
The section 56a includes a pair of vibrakor mounting brackets 176 and the section 56b includes a pair of vibrator mounting brackets 177. Similarly, the section 56c includes vibrator mounting brackets 178 and the section 56d includes vibrator mounting brackets 179. While only four sections and four pairs of mounting brackets are shown in FIGURES 9 and 10, it will be under-stood that six vibrators can be incorporated as showrl in the perspective view of FIGURE 8. Also it will be understood that an~ number of sections similar to the sections 56a - 56d can be incorporated, this varying from, for example3 10 four to eight sections, depending on the width of the road repaving apparatus.
The section 56a has a pair of access plates 180 and 181 secured over access apertures in its top member lO9 by lock ~abs and bolts indicated generally ; by reference numeral 182. The sections 56b - 56d have similar pairs of access plates 183 and 184, 187 and 188 and 190 and 191, secured over openings in their top members 107 by means of lock similar tabs and bolts.
As explained above, the sections 56a - 56d are adjustable relative to one another and the plate 108 is sufficiently flexible to allow the sect-ions to be relatively pivotable about axes between th sections indicated by reference numerals 200, 201 and 202. This enables the screed plate 108 to 20 be adjustably curved or arched so as to conform to the desired crown of the ~oad surface.
To adjust the section positionsJ the sections 56a and 56b are tied together at their upper ends by turnbuckle means 204 which extends bet~een a pair of upstanding plates 206 and 207 on the sections 56a and 56bJ respective-ly. The turnbuckle means 204 includes forward and rear turnbuckle elements 204a and 204b, as seen in FIGURE 8, which are coupled by a drive chain 209 which can be either manually or automatically driven to rotate the turnbuckles 204a and 204b simultaneously so as to effect uniform flexure of the forward : , : , : : . : :: . : -- , , :
.
. .
::
, 1 ~ ~ 3'~ ~
and rear portions of the sections 56a and 56b.
Sections 56b and 56c are adjustably connected by turnbuckle means 210 extending between upstanding plates 211 and 212. The turnbuckle means 210 also includes a forward turnbuckle 210a and a rear turnbuckle 210b, as seen in FIGURE 8, and these turnbuckles are tied together by a common drive chain and sprocket arrangement indicated generally by reference numeral 213.
The sections 56c and 56d are also adjustably secured together by additional turnbuckle means 216 mounted between upstanding plates 217 and 218. The turnbuckle means 216 includes a forward turnbuckle 216a and a rear turnbuckle ~ 10 216b tied together by a chain and sprocket arrangement 220.
; The details of only one of the turnbuckles will be set forth herein, it being understood that the turnbuckles are all constructed in substantially the same manner. The turnbuckle 216a includes a pair of thread-ed shafts 221 and 222 extending from a threaded body 223. The shafts 221 and 222 are secured to brackets 226 and 227, respectively, moun~ed at the top ends of the plates 217 and 218. The brackets 226 and 227 preferably are welded in position. Thethreaded member 223 has fixed to it a sprocket 229 engaging a chain to form the sprocket and chain adjusting arrangement 220. By operating this turnbuckle, the plate 108 is flexed about the axes 200, 201 and 202 to obtain the desired curvature.
The leading edge of screed 56 is formed by the aforementioned pipe or edge member 106, which, as seen in FIGU~E 10 comprises separate sections 106a, 106b; 106c and 106d respectively incorporated in the screed sectîons 56a - 56d. As seen in FUGURE 11, the pipe sections 106a - 106d are secured to the screed sections by bolts 240 which engage threaded ap0rtures 242, 243, respectively, formed within the pipe. A second set of threaded apertures 244 and 246 are formed diamekrically opposed from the apertures 24~ and 241, respectively. This enables the pipe or edge member sections to be removed ., :
: :
~ . :
: . . ..
~: . . . . ~ -.;
. ~:; ~ :: . . ,, . . . : ., . :. : ~ , . . .
~ ~ 3 ~ ~
from the position shown in the drawlngs, rotated 90, and then resecured in a position at the leading edge of the screed. In this instance, the pipe would be secured by the threaded apertures 242 and 244 when rotated counter-clockwise 90, or secured by threaded apertures 242 and 246 when rotated clock-wise 90. Thus, the pipe is capable of providing multiple wear surfaces for engaging the abrasive asphalt concrete material as the repaving machine passes over the road surface. For example, the quadrant designated by refer-ence numeral 247 is the wear surface presently disposed for engaging the asphalt concrete material during the repaving operation. However, when the quadrant 247 is substantially worn, the pipe edge member can be moved and rotated to expose a new quadran~ 248. Similarly, when this wear surface is depleted, the pipe or edge member may again be rotated to expose another new wear surface 249. Finally, a last wear surface 250 may be put into operation by again rotating the pipe. The screed 56 therefore provides a multiple ~ear surface device at the leading edge of the screed complacting plate or bottom wall 108.
An alternate embodiment is illustrated in FIGURES 12 and 13. Here a machine 310 includes preliminary heaters 312 and 314 like those described in connection with FIGURES 1-3. Nozzles ~not sho~n~ can be included if de$ir-ed to appl~ a preliminary coating of liquid asphalt to the heated pa~ement if desired or if road conditions require. These nozzles can be conveniently located between the heaters 312 and 314 or behind the second heater 314.
Scarifying blades 321~ mounted at a scarifying station 322 are urged against the road surface by air operating bags 323 which apply pressure to scarifying ; blade holding arms 324. As noted above, the scarifying blades and air bag operating controls are described and illustrated in Cutler United States patent No. 3,907,450, dated September 23, 1975.
Behind these scarifying blades 321 are windrowing augers 330 and .: .
: ,- , :
:" , : ~: :
. ~ , . '~ "
, : "':~, .~ , ,,, ':
~. ~ ' . ' .
~/3~Z:~
331 ~h~ch are arranged and rotated so as to conve~ the now-loosened and scarified materIal toward t~e cent~r of the machlne travel path as indicated by the arrows 332 and 333 in ~IGURE 12. slades 335 and 336 mounted behind the augers 330 and 331 respectively assist in presenting scarified material to the augers for this centralized movement. Behind the augers 330, 331 and and blades 335, 336, liquid dispensers 340 and 341 apply hot liquid asphalt ` and any desired rejuvenating agent to the scarified and now relatively denuded remaining highway surface. These dispensers can be arranged, if desired, to also add asphalt to the scarified and windrowed material.
At the front or any other convenient location upon the machine 310, a receiving hopper 350 is located to receive a quantity of hot mix 351 from a supply 352 in a truck 354 or other delivering unit. This hot mix 351 is conveyed from the receiving hopper 350, as by a conveyor 355, to a delivery and dispersing position 356. At this position, the newly delivered hot mix 351 is deposited atop the ma~erial scarified and windrvwed by the blades 321 - and augers 330, 331. An agitator device 360, here comprising a series of pug-mill paddles 361 and an associated backup plate 362, agitates and intermingles ~ , this newly delivered hot mix 351 and old road material to provide a new road- -forming composition. If desired, this paddle wheel 360 can be formed so ` 20 as to provide a spreading action to the composition as indicated by the arrows 365 and 366.
Behind the agitating paddle wheel 360, additional spreader augers 370 and 371 are oriented and are rotated so as to further spread and level the new composition as indicated by the arrows 372 and 373. ~ screed mechanism 380, which can be of the type described above, is provided to level ; and preliminarily compact this composition into a new road surface. ~aterial spreaders 385 and 386 can be provided to scatter a layer of nonskid synthetic aggregate atop the new road surface. It will be understood that a roller : ~ ~ . ., ' , , .............................. , ' : -, " '' , ~ .: : , ' .,, ' ,' - ' ' ~)73'~2~il yefiicle 388 or other compactor device can be used to achieve lOQ% of the des~red compaction ~or t~e newl~ rejuvenated asphalt concrete material and - recycled r~ad.
, ' .' ` ' ' ' ~"', " ' .'', ;' , ', , ' :, ~ :
....
, - --. . ; : . , -, . ' , . ' ' : ,
Claims (9)
1. A screed structure for use in apparatus of the type described comprising a bottom plate member engageable with a surface to be processed, a front edge member adjustably fixed along a forward edge of said plate member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement with a surface being processed.
2. A s?reed structure as defined in claim 1 wherein said bottom plate member is of substantial predetermined length, said screed structure including a plurality of means interconnected with successive sections of said plate member for adjustably deflecting said successive sections with respect to each other for shaping the plate member in accordance with a desired configuration of a surface being processed, and said screed structure including a plurality of said front edge mem-bers respectively associated with said bottom plate member sections.
3. A material mixing and spreading apparatus for use on a roadway processing vehicle movable in a predetermined direction comprising support frame means, a plurality of augers rotatably mounted on said support frame means and extending transversely of said direction of movement for engaging and transversely moving loose material on a roadway surface, and blade means immediately adjacent and behind certain of said augers for engaging and retaining a portion of the loose material in association with said certain of said augers for promoting mixing and transverse movement of said portion of loose mate-rial, and other augers being located behind said blade means for promoting spreading of the loosened material over the roadway, and a screed structure comprising a bottom plate mem-ber engageable with the spread, loosened material, a front edge member adjustably fixed along a forward edge of said plate member, said front edge member including a plurality of cir-cumferentially spaced wear surface portions, and means adjus-tably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement with the spread, loosened material.
4. An apparatus as defined in claim 3 wherein said certain of said augers include a first auger extending from adjacent one side of said frame means toward and substantially short of an opposite side of said frame means and a second auger extending from adjacent said opposite frame means side behind said first auger and substantially to said first men-tioned frame means side, said blade means including a first blade member disposed behind and substantially coextensive with said first auger and a second blade member disposed be-hind said second auger and extending from adjacent said oppo-site frame means side toward but substantially short of said first frame means side.
5. A structure as defined in claim 3 wherein said other augers includes an auger disposed behind said certain augers and extending substantially between said frame means sides for engaging loosened material and directing the loosened material transversely in opposite directions between said frame means sides for promoting spreading thereof.
6. Apparatus for restoring a roadway, comprising means for excavating the roadway surface, means for applying a quan-tity of asphalt to the excavated heated surface to form a rejuvenated asphalt mix, and vibrating screed means for com-pacting the rejuvenated asphalt mix, said vibrating screed means including a bottom plate member engageable with the rejuvenated asphalt mix, a front edge member adjustably fixed along a forward edge of said plate member, said front edge member including a plurality of circumferentially spaced wear surface portions, and means adjustably fixing said front edge member for enabling said wear surface portions selectively to be presented for engagement with the rejuvenated asphalt mix, the screed means further including a yieldable bottom plate, and means for flexing the yieldable bottom plate in accordance with the radius of curvature of the road surface being restored to form a crown for the road surface.
7. Apparatus for restoring a roadway as set forth in claim 6 wherein said removable leading edge of said screed includes a pipe, said pipe including apertures extending therethrough for mounting said screed in a first orientation and apertures in said pipe for mounting said screed in a second orientation, said second orientation forming a new wear surface for the leading edge of said screed.
8. Apparatus for restoring the roadway as set forth in claim 7 wherein said apertures in said pipe are positioned in quadrature relation, and wherein said pipe is adapted to be rotated in increments of 90° to provide four wear surfaces for the leading edge of said screed.
9. Apparatus for restoring a roadway as set forth in claim 6 wherein said means for flexing said yieldable bottom plate includes upstanding brackets secured to a plurality of independent sections forming said screed, each of said sec-tions being secured to said yieldable bottom plate, and turn-buckle means secured between said upstanding brackets for urging said independent sections toward or away from one another to bend said bottom plate in accordance with the radius of curvature of the road surface being restored.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA313,711A CA1073723A (en) | 1975-12-31 | 1978-10-18 | Asphalt pavement recycling apparatus |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US64592875A | 1975-12-31 | 1975-12-31 | |
| CA263,260A CA1081516A (en) | 1975-12-31 | 1976-10-13 | Asphalt pavement recycling apparatus |
| CA313,711A CA1073723A (en) | 1975-12-31 | 1978-10-18 | Asphalt pavement recycling apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073723A true CA1073723A (en) | 1980-03-18 |
Family
ID=27164688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA313,711A Expired CA1073723A (en) | 1975-12-31 | 1978-10-18 | Asphalt pavement recycling apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1073723A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713595A (en) * | 2022-04-12 | 2022-07-08 | 晋城市路创沥青应用有限公司 | Method for separating asphalt and aggregate in recycled old asphalt concrete |
-
1978
- 1978-10-18 CA CA313,711A patent/CA1073723A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114713595A (en) * | 2022-04-12 | 2022-07-08 | 晋城市路创沥青应用有限公司 | Method for separating asphalt and aggregate in recycled old asphalt concrete |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |