CA1110893A - Joint forming device for multi-layered concrete - Google Patents
Joint forming device for multi-layered concreteInfo
- Publication number
- CA1110893A CA1110893A CA317,959A CA317959A CA1110893A CA 1110893 A CA1110893 A CA 1110893A CA 317959 A CA317959 A CA 317959A CA 1110893 A CA1110893 A CA 1110893A
- Authority
- CA
- Canada
- Prior art keywords
- cementitious
- cementitious composition
- frame
- composition
- receiving
- 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
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- Road Paving Structures (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A machine and method are provided for laying more than one layer of cementitious pavement simultaneously on a base surface. The machine has a movable frame and a first receiving structure for receiving a first cementitious compo-sition in a plastic condition. A first strike-off mechanism is provided for shaping a first cementitious composition in the first receiving structure by forming grooves in the top surface thereof. Second receiving structure is attached to the frame behind the first receiving structure for receiving and depositing a second cementitious composition in a plastic condition on top of the first composition. A second strike-off mechanism is then provided for leveling off the top of the second cementitious composition to form a two layer pavement of a desired thickness.
By the use of this apparatus according to the method provided, the two cementitious compositions form interlocking layers which dry together. The layers of the concrete pavement are positively connected together to prevent relative movement between the layers.
A machine and method are provided for laying more than one layer of cementitious pavement simultaneously on a base surface. The machine has a movable frame and a first receiving structure for receiving a first cementitious compo-sition in a plastic condition. A first strike-off mechanism is provided for shaping a first cementitious composition in the first receiving structure by forming grooves in the top surface thereof. Second receiving structure is attached to the frame behind the first receiving structure for receiving and depositing a second cementitious composition in a plastic condition on top of the first composition. A second strike-off mechanism is then provided for leveling off the top of the second cementitious composition to form a two layer pavement of a desired thickness.
By the use of this apparatus according to the method provided, the two cementitious compositions form interlocking layers which dry together. The layers of the concrete pavement are positively connected together to prevent relative movement between the layers.
Description
lil~893 The present invention relates generally to highway paving equip-ment, and more specifically to equipment for laying a plurality of layers of concrete simultaneously.
Certain aggregates are better than others for use in concrete for forming highways and the like.
The aggregates used for such concrete should be of a high quality material. In certain parts of the U.S.A. such high quality aggregates are readily available, but in many parts of the United States the supply of high quality aggregates is limited or nonexistent. Consequently, these higher quality aggregates must be shipped in from wherever they are availa-ble, thereby increasing the cost thereof considerably by virtue of suchtransportation costs.
Because of this shortage of high quality aggregates in many areas, many people in the paving industry are advocating the use of a two layer concrete pavement, the lower layer of which would be formed by a mixture of primarily portland cement, water and locally avallable aggregates, while the upper layer of the pavement which would be sub~ected to wear would be formed of concrete with the usual high quality aggregate therein. The use of a cheaper and more readily available aggregate forms a concrete commonly referred to as "econocrete". It can easily be appreciated that there would be a considerabIe savings in material and transportation costs if such a composite pavement is used.
Certain aggregates are better than others for use in concrete for forming highways and the like.
The aggregates used for such concrete should be of a high quality material. In certain parts of the U.S.A. such high quality aggregates are readily available, but in many parts of the United States the supply of high quality aggregates is limited or nonexistent. Consequently, these higher quality aggregates must be shipped in from wherever they are availa-ble, thereby increasing the cost thereof considerably by virtue of suchtransportation costs.
Because of this shortage of high quality aggregates in many areas, many people in the paving industry are advocating the use of a two layer concrete pavement, the lower layer of which would be formed by a mixture of primarily portland cement, water and locally avallable aggregates, while the upper layer of the pavement which would be sub~ected to wear would be formed of concrete with the usual high quality aggregate therein. The use of a cheaper and more readily available aggregate forms a concrete commonly referred to as "econocrete". It can easily be appreciated that there would be a considerabIe savings in material and transportation costs if such a composite pavement is used.
- 2 -8g3 One of the problems associated with using two layers of concrete is that time and labor cost~ were increased because a first slip form machine was used to place the "econocrete" layer, and a second machine went over the "econocrete" layer and deposited the higher quality layer of concrete. This problem has been overcome by the use of a machine and a method provided by U.S. Patent No. 4,073,592 issued February 14, 1978 to Godbersen, et. al.
Another problem associated with the use of multi-layered concrete pavement is the one of insuring that the two layers stay bonded together.
This problem i8 solved by the use of the apparatus and method described in the above identified U.S. Pàtent No. 4,073,592 which discloses laying two or more layers of concrete simultaneously 80 that they will bond together permanently. Since this bonding of the two layers is to insure that the two layers do not come separated and become movable, one with respect to the other, it is desirable to do anything economically feasible towards assuring the achievement of this goal.
An object of one broad aspect of this invention is to provi,de an improved apparatus for laying a multi-layered pavement.
An object of another aspect of this invention is to provide an apparatus for positively connecting layers of concrete pavement together for prevention relation relative movement bet-ween the layers.
By one broad aspect of this invention, an apparatus is provided for concurrently laying a multiple layered cementitious pavement on a base surface, said apparatus having a normal direction of movement and inc],uding: a movable frame; a first s-trike-off means and being positi,oned generally trar.sversely of the normal direction of movement of the frame for shaping the top of the first cementitious composition; a second means attached to the frame and specially adapted for receiving a second ceme3l-titious composition and for depositing that second cementitious composition on top of t-he first cementitious compositionj a second strike-off means attached to the frame behind the second receiving means and being positioned generally transversely to the normal direc1,ion of movement of the frame for determining a top level of the second cementitious compositionj t,he ,improvement compr;sing:
means disposed on the bottom of -the first strike-off means for forming grooves in the top of the first cementitious composition in a plastic condition, which grooves are then immediately filled with the second cementitious composi1;on in a plastic condition to form interlocking layers of cementitious material which dry to-gether, thereby substantially preventing the first and second cementitious coMpositions from moving with respect .o each oth~r once the pavement is laid.
By another aspect of this invention, a method is pro-vided for concurrently laying a multiple layered cementitious pavement on a base surface by use of a single machine having a normal direction of movement, said machine including a movable frame; a first means attached to a front portion of said frame and specially adapted for receiving a first cementitious compo-sition; a first strike-off means and being positioned generally transversely of the normal direction of movement of the frame for shaping the top the first cementitious composition; a second means a-ttached to the frame and specially adapted for receiving a second cementitious composition and for depositing the second cementitious composition on top of the first cementitious compo-sition; a second strike-off means attached to the frame behind the second receiving means and being positioned generally trans-versely to the normal direction of movement of t-he frame for de-termining a top level of the second composition; and means disposed on the bottom of the first strike-off means for forming groooves in the top of the first cementitious compositions, the method comprising; depositing a first homogeni.ous cementitious composi-tion in a plastic condition on the base surface in front of thefirst means for receiving the first composition; ]eveling the first cementitious composition with the first strike-off means;
forming grooves in the top of the first cementitious composition;
depositing a second homogenious cemen-titious composition in a plastic condition into the second means for receiving the second cementitious composition and into the grooves in the first cemen-tit;ous composition; leveling the second cementitious composition by use of the second strike-off means; whereby all of the steps of the method 4 a -are performed simultaneously; and whereby the cementitious com-positions are formed in-to interlocking layers which dr,y together, thereby substantially preventing the first and second cementi-tious compositions from moving with respect to each other once the pavement is laid.
By a variant thereof, the first ceinentitious composi-tion is formed of different material than the second cementitious composition.
Thus, by one embodiment- of the present invention, a machine is provided which is of a type for laying more than one layer of cementitious pavement simultaneously on a base surface.
The m~chine includes a moveable frame. A first receiving struc-ture is attached to the front of the frame for receiving a first cementitious composition and a first strike-off mechallism is positioned behind such receiving structure for shaping the top of the first cementitious composition. The first strike-off mechanism has a cross-sectional shape which causes a non-planar surface, e.g. grooves to be formed on the top to the first cementitious composition (while it is in the plastic state), - 4 b -A second receivlng structure is attached to the frame behind the first re-ceiving structure for receiving and depositing the second cementitious composition on top of the first cementitioug composition and a second strike-off mechanism is positioned for shaping the top level of the second cementitious composition. When the second cementitious composition (also in the plastic state) is placed on top of it there will be an interlocking effect between the two layers of cementitious compositions so as to insure that the layers will not move with respect to each.
In the accompanying drawings, Figure 1 is a side elevational cross sectional view of a paving machine constructed in accordance with one aspect of the present invention;
Figure 2 is a partial cross sectional view taken along line 2-2 of Figure l;
Figure 3 i8 a partial perspective view of the under side of the groove forming mechanism of the apparatus of an aspect of the present in-vention;
Figure 4 is a partial enlarged cross-sectional view taken along line 4-4 of Figure 3;
Figure 5 is a view of the botton layer of concrete formed in accordance with apparatus of an aspect of this invention; and Figure 6 is a cross-sectional view taken along line 6-6 of Figure 1.
Referring now to the drawing wherein like reference numerals designate identical or corresponding parts throughout the several views, Figure 1 shows a concrete paving machine generally indicated at 10 having a first receiving chamber 11 on the front end thereof for receiving a first cementitious material 12 in a plastic condition, and a second receiving hopper 13 for receiving a second cementitious material 14, which material, 14, is also in a plastic condition for being shaped by use of slip forming equipment. The main part of this machine is of a conventional design and can be substantially the same as that shown in the aforesaid U.S. Patent 10 No. 4,073,592 to Godbersen, et. al.
A first vibrator 16 is attached to the front portion of the first material receiving structure 11 by means of a clamping structure 17.
A hydraulic cylinder 18 is pivotally attached to the framework 19 of the machine 10 at one end 21 thereof. The other end 22 of the hydraulic cylinder 18 i8 pivotally attached to a lever 23, which attaches to the structure 17, which mounting 6tructure 17 is disclosed more fully in the above mentioned U.S. Patent. The hydraulic cylinder 18 and its associated structure can then ~e used to pivot the vibrator structure 16 to deeper or shallower levels within the first composltion 12 as needed. The vibra-tor 16 is, of course, for the purpose of causing the material 12 to settleand to eliminate the voids or bubbles therein which would otherwise be present.
A second vibrator or plurality of vibrators 24 is disposed in the second hopper 13 for the purpose of vibrating the material 14 within the hopper 13 to cause it to settle and remove all voids or bubbles as with the vibrator 16. Control structures 26, 27 and 28 are also associa-ted with the vibrators 24 and are identical in function to the elements 17, 18, 23 respectively of the first receiving structure 11 and vibrators 1~.
Also disposed within the hoppers 11 and 13 are auger assemblies 29 and 31 respectively. These auger assemblies 29 and 31 serve to spread out the material within each respective hopper 11 and 13 and keep this material moving forwart. These augers 29 and 31 are, of course, constantly rotating when the machine i~ in operation.
A tamping assembly 32 is also disposed within the second hopper 13 and is constantly movlng vertically in a reciprocal fashion in order to help level off the second composition 14 and to be sure that adequate material flows under the finishing plate 33.
Referring now to the most important feature of the apparatus of an aspect of this invention, it is noted that a striXe-off mechanism 34 is ateached to the side-plate framework 19 by means of a pair of nut and bolt assemblies 35 which extend through openings in the framework 19 and through slots 36 in the ends of gtrike-off plate 34. Thi~ member 34 ex-tends completely across the machine from the side plate 1~ on one side thereon to an identical sideplate 19 on the other side of the machine 10.
The bottom of the strike-off mechani~m 34 has substantially flat portions 37 and a pluraltiy of ribg 38 evenly disposed between the flat portion~
37.
In operation, a "ready-mix" truck having a spout 39 dumps a first "econocrete" material 12 in front of the first material receiving structure 11 and between the side plates 40 of the slip forming machine lO.
At the same time, a second "ready-mix" truck dumps a second concrete mater-ial 14 into the second hopper 13 out of a spout 41. It is to be understood that normally this second material 14 would be a concrete material in a plastic condition which has high quality aggregates therein. This dumping of the materials 12 and 14 into the material receiving chambers 11 and 13 would occur periodically as the machine continues to move in the forward direction as indicated by the arrow 42 in Figure 1.
As the machine continues to move, the vibrating structure 16 settles the "econocrete" materlal 12, taking the bubbles and voids out of this layer, while the auger 29 tends to level out such material 12 and keep it moving forwardly. At the same time, the first strike-off mechan-ism 34 operates to strike off the material 12 at the level and to the con-figuration shown in Figure 5, whereby the material 12 is formed with a plurality of grooves 43 (Fig. 5) therein. At the same time the second layer of material 14 is being laid on top of the first material 12. While the vibrator 24 is causing the bubble~ and voids to be dissipated from the material 14 within the opper 13, the auger 31 is distributing the material across the hopper 13, keeping this material moving forwardly ahead of the auger 31 and the tampin~ bar 32 is operating to level off the material 14 and assure that the material is pressed down into the grooves 43 and is evenly distributed and packed under the finishing plate 33.
Another problem associated with the use of multi-layered concrete pavement is the one of insuring that the two layers stay bonded together.
This problem i8 solved by the use of the apparatus and method described in the above identified U.S. Pàtent No. 4,073,592 which discloses laying two or more layers of concrete simultaneously 80 that they will bond together permanently. Since this bonding of the two layers is to insure that the two layers do not come separated and become movable, one with respect to the other, it is desirable to do anything economically feasible towards assuring the achievement of this goal.
An object of one broad aspect of this invention is to provi,de an improved apparatus for laying a multi-layered pavement.
An object of another aspect of this invention is to provide an apparatus for positively connecting layers of concrete pavement together for prevention relation relative movement bet-ween the layers.
By one broad aspect of this invention, an apparatus is provided for concurrently laying a multiple layered cementitious pavement on a base surface, said apparatus having a normal direction of movement and inc],uding: a movable frame; a first s-trike-off means and being positi,oned generally trar.sversely of the normal direction of movement of the frame for shaping the top of the first cementitious composition; a second means attached to the frame and specially adapted for receiving a second ceme3l-titious composition and for depositing that second cementitious composition on top of t-he first cementitious compositionj a second strike-off means attached to the frame behind the second receiving means and being positioned generally transversely to the normal direc1,ion of movement of the frame for determining a top level of the second cementitious compositionj t,he ,improvement compr;sing:
means disposed on the bottom of -the first strike-off means for forming grooves in the top of the first cementitious composition in a plastic condition, which grooves are then immediately filled with the second cementitious composi1;on in a plastic condition to form interlocking layers of cementitious material which dry to-gether, thereby substantially preventing the first and second cementitious coMpositions from moving with respect .o each oth~r once the pavement is laid.
By another aspect of this invention, a method is pro-vided for concurrently laying a multiple layered cementitious pavement on a base surface by use of a single machine having a normal direction of movement, said machine including a movable frame; a first means attached to a front portion of said frame and specially adapted for receiving a first cementitious compo-sition; a first strike-off means and being positioned generally transversely of the normal direction of movement of the frame for shaping the top the first cementitious composition; a second means a-ttached to the frame and specially adapted for receiving a second cementitious composition and for depositing the second cementitious composition on top of the first cementitious compo-sition; a second strike-off means attached to the frame behind the second receiving means and being positioned generally trans-versely to the normal direction of movement of t-he frame for de-termining a top level of the second composition; and means disposed on the bottom of the first strike-off means for forming groooves in the top of the first cementitious compositions, the method comprising; depositing a first homogeni.ous cementitious composi-tion in a plastic condition on the base surface in front of thefirst means for receiving the first composition; ]eveling the first cementitious composition with the first strike-off means;
forming grooves in the top of the first cementitious composition;
depositing a second homogenious cemen-titious composition in a plastic condition into the second means for receiving the second cementitious composition and into the grooves in the first cemen-tit;ous composition; leveling the second cementitious composition by use of the second strike-off means; whereby all of the steps of the method 4 a -are performed simultaneously; and whereby the cementitious com-positions are formed in-to interlocking layers which dr,y together, thereby substantially preventing the first and second cementi-tious compositions from moving with respect to each other once the pavement is laid.
By a variant thereof, the first ceinentitious composi-tion is formed of different material than the second cementitious composition.
Thus, by one embodiment- of the present invention, a machine is provided which is of a type for laying more than one layer of cementitious pavement simultaneously on a base surface.
The m~chine includes a moveable frame. A first receiving struc-ture is attached to the front of the frame for receiving a first cementitious composition and a first strike-off mechallism is positioned behind such receiving structure for shaping the top of the first cementitious composition. The first strike-off mechanism has a cross-sectional shape which causes a non-planar surface, e.g. grooves to be formed on the top to the first cementitious composition (while it is in the plastic state), - 4 b -A second receivlng structure is attached to the frame behind the first re-ceiving structure for receiving and depositing the second cementitious composition on top of the first cementitioug composition and a second strike-off mechanism is positioned for shaping the top level of the second cementitious composition. When the second cementitious composition (also in the plastic state) is placed on top of it there will be an interlocking effect between the two layers of cementitious compositions so as to insure that the layers will not move with respect to each.
In the accompanying drawings, Figure 1 is a side elevational cross sectional view of a paving machine constructed in accordance with one aspect of the present invention;
Figure 2 is a partial cross sectional view taken along line 2-2 of Figure l;
Figure 3 i8 a partial perspective view of the under side of the groove forming mechanism of the apparatus of an aspect of the present in-vention;
Figure 4 is a partial enlarged cross-sectional view taken along line 4-4 of Figure 3;
Figure 5 is a view of the botton layer of concrete formed in accordance with apparatus of an aspect of this invention; and Figure 6 is a cross-sectional view taken along line 6-6 of Figure 1.
Referring now to the drawing wherein like reference numerals designate identical or corresponding parts throughout the several views, Figure 1 shows a concrete paving machine generally indicated at 10 having a first receiving chamber 11 on the front end thereof for receiving a first cementitious material 12 in a plastic condition, and a second receiving hopper 13 for receiving a second cementitious material 14, which material, 14, is also in a plastic condition for being shaped by use of slip forming equipment. The main part of this machine is of a conventional design and can be substantially the same as that shown in the aforesaid U.S. Patent 10 No. 4,073,592 to Godbersen, et. al.
A first vibrator 16 is attached to the front portion of the first material receiving structure 11 by means of a clamping structure 17.
A hydraulic cylinder 18 is pivotally attached to the framework 19 of the machine 10 at one end 21 thereof. The other end 22 of the hydraulic cylinder 18 i8 pivotally attached to a lever 23, which attaches to the structure 17, which mounting 6tructure 17 is disclosed more fully in the above mentioned U.S. Patent. The hydraulic cylinder 18 and its associated structure can then ~e used to pivot the vibrator structure 16 to deeper or shallower levels within the first composltion 12 as needed. The vibra-tor 16 is, of course, for the purpose of causing the material 12 to settleand to eliminate the voids or bubbles therein which would otherwise be present.
A second vibrator or plurality of vibrators 24 is disposed in the second hopper 13 for the purpose of vibrating the material 14 within the hopper 13 to cause it to settle and remove all voids or bubbles as with the vibrator 16. Control structures 26, 27 and 28 are also associa-ted with the vibrators 24 and are identical in function to the elements 17, 18, 23 respectively of the first receiving structure 11 and vibrators 1~.
Also disposed within the hoppers 11 and 13 are auger assemblies 29 and 31 respectively. These auger assemblies 29 and 31 serve to spread out the material within each respective hopper 11 and 13 and keep this material moving forwart. These augers 29 and 31 are, of course, constantly rotating when the machine i~ in operation.
A tamping assembly 32 is also disposed within the second hopper 13 and is constantly movlng vertically in a reciprocal fashion in order to help level off the second composition 14 and to be sure that adequate material flows under the finishing plate 33.
Referring now to the most important feature of the apparatus of an aspect of this invention, it is noted that a striXe-off mechanism 34 is ateached to the side-plate framework 19 by means of a pair of nut and bolt assemblies 35 which extend through openings in the framework 19 and through slots 36 in the ends of gtrike-off plate 34. Thi~ member 34 ex-tends completely across the machine from the side plate 1~ on one side thereon to an identical sideplate 19 on the other side of the machine 10.
The bottom of the strike-off mechani~m 34 has substantially flat portions 37 and a pluraltiy of ribg 38 evenly disposed between the flat portion~
37.
In operation, a "ready-mix" truck having a spout 39 dumps a first "econocrete" material 12 in front of the first material receiving structure 11 and between the side plates 40 of the slip forming machine lO.
At the same time, a second "ready-mix" truck dumps a second concrete mater-ial 14 into the second hopper 13 out of a spout 41. It is to be understood that normally this second material 14 would be a concrete material in a plastic condition which has high quality aggregates therein. This dumping of the materials 12 and 14 into the material receiving chambers 11 and 13 would occur periodically as the machine continues to move in the forward direction as indicated by the arrow 42 in Figure 1.
As the machine continues to move, the vibrating structure 16 settles the "econocrete" materlal 12, taking the bubbles and voids out of this layer, while the auger 29 tends to level out such material 12 and keep it moving forwardly. At the same time, the first strike-off mechan-ism 34 operates to strike off the material 12 at the level and to the con-figuration shown in Figure 5, whereby the material 12 is formed with a plurality of grooves 43 (Fig. 5) therein. At the same time the second layer of material 14 is being laid on top of the first material 12. While the vibrator 24 is causing the bubble~ and voids to be dissipated from the material 14 within the opper 13, the auger 31 is distributing the material across the hopper 13, keeping this material moving forwardly ahead of the auger 31 and the tampin~ bar 32 is operating to level off the material 14 and assure that the material is pressed down into the grooves 43 and is evenly distributed and packed under the finishing plate 33.
Claims (3)
1. In apparatus for concurrently laying a multiple layered cementitious pavement on a base surface, said apparatus having a normal direction of movement and including: a movable frame; a first means attached to a front portion of said frame and specially adapted for receiving a first cementitious composi-tion; a first strike-off means and being positioned generally transversely of the normal direction of movement of said frame for shaping the top said first cementitious composition; a second means attached to said frame and specially adapted for receiving a second cementitious composition and for depositing said second cementitious composition on top of said first cementitious com-position; a second strike-off means attached to said frame behind said second receiving means and being positioned generally trans-versely to the normal direction of movement of said frame for determining a top level of said second cementitious composition;
the improvement comprising: means disposed on the bottom of said first strike-off means for forming grooves in the top of said first cementitious composition in a plastic condition which grooves are then immediately filled with said second cementitious composition in a plastic condition to form interlocking layers of cementitious material which dry together, thereby substantially preventing said first and second compositions from moving with respect to each other once said pavement is laid.
the improvement comprising: means disposed on the bottom of said first strike-off means for forming grooves in the top of said first cementitious composition in a plastic condition which grooves are then immediately filled with said second cementitious composition in a plastic condition to form interlocking layers of cementitious material which dry together, thereby substantially preventing said first and second compositions from moving with respect to each other once said pavement is laid.
2. A method of concurrently laying a multiple layered cementitious pavement on a base surface by use of a single machine having a normal direction of movement, said machine including a movable frame; a first means attached to a front portion of said frame and specially adapted for receiving a first cementitious composition; a first strike-off means and being positioned generally transversely of the normal direction of movement of said frame for shaping the top said first cementitious composition;
a second means attached to said frame and specially adapted for receiving a second cementitious composition and for depositing said second cementitious composition on top of said first cemen-titious composition; a second strike-off means attached to said frame behind said second receiving means and being positioned generally transversely to the normal direction of movement of said frame for determining a top level of said second cementitious composition; and means disposed on the bottom of said first strike-off means for forming grooves in the top of said first cementitious composition, said method comprising; depositing a first homogenious cementitious composition in a plastic condition on said base sur-face in front of said first means for receiving said first cemen-titious composition; leveling said first cementitious composition with said first strike-off means; forming grooves in the top of said first cementitious composition; depositing a second homogenious cementitious composition in a plastic condition into said second means for receiving the second cementitious composition and into said grooves in said first cementitious composition; leveling said second cementitious composition by use of said second strike-off means; whereby all of the steps of said method are performed simultaneously; and whereby said cementitious compositions are formed into interlocking layers which dry together, thereby sub-stantially preventing said first and second cementitious composi-tions from moving with respect to each other once said pavement is laid.
a second means attached to said frame and specially adapted for receiving a second cementitious composition and for depositing said second cementitious composition on top of said first cemen-titious composition; a second strike-off means attached to said frame behind said second receiving means and being positioned generally transversely to the normal direction of movement of said frame for determining a top level of said second cementitious composition; and means disposed on the bottom of said first strike-off means for forming grooves in the top of said first cementitious composition, said method comprising; depositing a first homogenious cementitious composition in a plastic condition on said base sur-face in front of said first means for receiving said first cemen-titious composition; leveling said first cementitious composition with said first strike-off means; forming grooves in the top of said first cementitious composition; depositing a second homogenious cementitious composition in a plastic condition into said second means for receiving the second cementitious composition and into said grooves in said first cementitious composition; leveling said second cementitious composition by use of said second strike-off means; whereby all of the steps of said method are performed simultaneously; and whereby said cementitious compositions are formed into interlocking layers which dry together, thereby sub-stantially preventing said first and second cementitious composi-tions from moving with respect to each other once said pavement is laid.
3. The method claim 2 whereby said first cementitious composition is formed of different material than said second cementitious composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA317,959A CA1110893A (en) | 1978-12-14 | 1978-12-14 | Joint forming device for multi-layered concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA317,959A CA1110893A (en) | 1978-12-14 | 1978-12-14 | Joint forming device for multi-layered concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1110893A true CA1110893A (en) | 1981-10-20 |
Family
ID=4113141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA317,959A Expired CA1110893A (en) | 1978-12-14 | 1978-12-14 | Joint forming device for multi-layered concrete |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1110893A (en) |
-
1978
- 1978-12-14 CA CA317,959A patent/CA1110893A/en not_active Expired
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