CA2029922C - Concrete dowel placement sleeves - Google Patents
Concrete dowel placement sleeves Download PDFInfo
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- CA2029922C CA2029922C CA 2029922 CA2029922A CA2029922C CA 2029922 C CA2029922 C CA 2029922C CA 2029922 CA2029922 CA 2029922 CA 2029922 A CA2029922 A CA 2029922A CA 2029922 C CA2029922 C CA 2029922C
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- dowel
- concrete
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- slip
- flange
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Abstract
Slip and non-slip dowel placement sleeves are disclosed. The slip dowel placement sleeve generally comprises a tubular dowel receiving sheath having a closed distal end and an open proximal end. A connecting means of perpendicular flange is formed around the proximal opening of the sheath to facilitate attachment of the sheath to a concrete form. Smooth sections of dowel rod may then be advanced through holes drilled in the concrete form and into the interior compartment of the sheath.
Concrete is poured within the form and the dowel rod remains slidably disposed within the interior of the sheath. Variations of the basic slip dowel placement sleeve of the invention includes a tapered "extractable"
sleeve and a corrugated "grout tube" for placement of non-slip dowel or rebar.
Concrete is poured within the form and the dowel rod remains slidably disposed within the interior of the sheath. Variations of the basic slip dowel placement sleeve of the invention includes a tapered "extractable"
sleeve and a corrugated "grout tube" for placement of non-slip dowel or rebar.
Description
_1_ SHAt~IS°002A
CONC3~ETE D~6~EI. PId~CEE~EP1T ShE~EiTi:S
The invention pertains generally to the art of concrete construction and more particularly to devices for 5. facilitating placement of slip and/or non-slip dowel rods within adjacent concrete slabs.
Tn the art of concrete construction, it is commonplace to form "cold joints" between two or more poured concrete slabs. Such cold joixits frequently become uneven or buckled due to normal thermal expansion and contraction of the concrete and/or compaction of the underlying soil caused by inadequate substrate preparation prior to pouring of the concrete. As a means of preventing buckling or angular displacement of such cold joints, it is common pxactic~ to insert smooth steel dowel rods generally known as "slip dowels" within the edge portions of adjoining concrete slabs fn such a manner that the concrete slabs may slide freely ~ a~.ong one or more of the slip dowels, thereby permitting linear expansion and contraction of the slabs while at the same 'time maintaining the slabs in a common plane anc~ thus preventing undesirable buckling o~ unevenness of the c~ld joint.
In order to function effectively, slip dovuels must be.
, accurately positioned parallel' within the adjoining concrete slabs. If the dowels are non-parallel positioned, such will prevent the desired s7.ippage of the dowels and will defeat the purpose of the "slip dowel"
application. Additionally, the individual dowels must be placed within one or both of the slabs in such a manner as to permit .continual slippage or movement of the dowel within the curedconc~ete slab(s).
Tn hhe prior art, twa methods of installing smooth "slip dowels" have become popular. According to the first i ~2~~~~
CONC3~ETE D~6~EI. PId~CEE~EP1T ShE~EiTi:S
The invention pertains generally to the art of concrete construction and more particularly to devices for 5. facilitating placement of slip and/or non-slip dowel rods within adjacent concrete slabs.
Tn the art of concrete construction, it is commonplace to form "cold joints" between two or more poured concrete slabs. Such cold joixits frequently become uneven or buckled due to normal thermal expansion and contraction of the concrete and/or compaction of the underlying soil caused by inadequate substrate preparation prior to pouring of the concrete. As a means of preventing buckling or angular displacement of such cold joints, it is common pxactic~ to insert smooth steel dowel rods generally known as "slip dowels" within the edge portions of adjoining concrete slabs fn such a manner that the concrete slabs may slide freely ~ a~.ong one or more of the slip dowels, thereby permitting linear expansion and contraction of the slabs while at the same 'time maintaining the slabs in a common plane anc~ thus preventing undesirable buckling o~ unevenness of the c~ld joint.
In order to function effectively, slip dovuels must be.
, accurately positioned parallel' within the adjoining concrete slabs. If the dowels are non-parallel positioned, such will prevent the desired s7.ippage of the dowels and will defeat the purpose of the "slip dowel"
application. Additionally, the individual dowels must be placed within one or both of the slabs in such a manner as to permit .continual slippage or movement of the dowel within the curedconc~ete slab(s).
Tn hhe prior art, twa methods of installing smooth "slip dowels" have become popular. According to the first i ~2~~~~
method, a first concrete pour is made within a pre°existing form. After the first pour has cured, an edge of the farm (usually wooden stud) is stripped away.
A series of hales are then drilled parallel into the first pour along the exposed edge from which the form has been removed. The depth and diameter of the individual holes varies depending on the application and the relative size of the concrete slabs to be supported . As a general rule, however, such holes are at least 12" deep and typically have a diameter of approximately 5/8 of an inch.
Aftervthe parallel aligned series of holes has been drilled into the first pour, smooth dowel rods are advanced into each such hole such that one end of each dowel rod is positioned within the first pour and the remainder of each dowel rocl extends into a neighboring area where a second slab of concrete is to be poured:
Thereafter, concrete is poured into such neigh~soring urea and is permitted to set waah the parallel aligned dowels extending thereinto. After the second pov.r has set, the 1 20 slip dowels will be held firmly within the second syab but will be' permitted to slide longitudinally writhin the drilled holes of the first slab thereby accomodating longitudinal expansion and contraction of the two slabs while at the' same' time preventing buckling or angular movement therebetween.
Although the above described "drilling -method" of, placing slip dov~rels has became popular, it will be appreciated that. such method is extremely lalaor intensive.
In fact, it takes appraximatel~r ten miinutes to drily a 8~ 5~8" diameter by 12" long hale into the first p~ur and the drilling equipment, bits, accessories, grad associated set up time tends to be very expensive. Moreover, the laborers who drill the holes and place the ship dac~els must be adequately trained to insure that the dowels are arranged perpendicular to the joint but parallel to one another so ~s to permit the desired syippage during ~\
A series of hales are then drilled parallel into the first pour along the exposed edge from which the form has been removed. The depth and diameter of the individual holes varies depending on the application and the relative size of the concrete slabs to be supported . As a general rule, however, such holes are at least 12" deep and typically have a diameter of approximately 5/8 of an inch.
Aftervthe parallel aligned series of holes has been drilled into the first pour, smooth dowel rods are advanced into each such hole such that one end of each dowel rod is positioned within the first pour and the remainder of each dowel rocl extends into a neighboring area where a second slab of concrete is to be poured:
Thereafter, concrete is poured into such neigh~soring urea and is permitted to set waah the parallel aligned dowels extending thereinto. After the second pov.r has set, the 1 20 slip dowels will be held firmly within the second syab but will be' permitted to slide longitudinally writhin the drilled holes of the first slab thereby accomodating longitudinal expansion and contraction of the two slabs while at the' same' time preventing buckling or angular movement therebetween.
Although the above described "drilling -method" of, placing slip dov~rels has became popular, it will be appreciated that. such method is extremely lalaor intensive.
In fact, it takes appraximatel~r ten miinutes to drily a 8~ 5~8" diameter by 12" long hale into the first p~ur and the drilling equipment, bits, accessories, grad associated set up time tends to be very expensive. Moreover, the laborers who drill the holes and place the ship dac~els must be adequately trained to insure that the dowels are arranged perpendicular to the joint but parallel to one another so ~s to permit the desired syippage during ~\
subsequent use.
The second popular method of placing slip dowels involves the use of wax treated cardboard sleeves positioned over one end of each individual dowel.
According to such method, a series of holes are drilled through one edge of a concrete form and smooth dowels are advanced through each such hole. Wax treated cardboard sleeves are placed over one end of each such dowel and the first pour is made within the form. After the first pour has set, the previously drilled form is stripped avaay leaving the individual dowels extending into a neighboring open space where the second pour a.s to ne matte.
Subsequently, the- second pour is made and permitted to cure. Thereafter, the slip dowels will be firmly held by the concrete of the second pour but will be permitted to longitudinally slide against the inner su~fac~s of the wax treated cardboard sleeves ~ within the first pour. Thus, the waxed cardboard sleeves facilitate longitudinal slippage of the dowels, while a~ the same time holding the two concrete slabs in a common plane, and preventing undesirable buckling or angular movement thereof.
This second method, whi7.e. presently popular, is nonetheless associated with numerous deficierleies. For example, after the first pour has been made, tY~e free ends of the dowels are likely to project as much as 18°' through the forms and in~.o the' open space allowed fox' the second .
pour. because the drilled section of form must be advanced over these exposed sections of dowel to accomplish stripping ox 'removal of the dorm,' it is not infrequent for the exposed portions of the dowels to become bent and, ~thusr nonparalleJ.. Also, the drilled section of form may become damaged or broken during the removal process, thereby precluding as s reuse.
It is unfortunate that both of the above described popular mefi,hods of placing ship dowels often result in the dowels being fa~nally positioned at various angles rather than in the desired parallel array. When such occurs, the necessary slippage of the dowels is impeded or prevented.
In other applications wherein longitudinal slippage of the dowels is not desired, it is common to employ non-slip dowels or rebar disposed through two or more adjacent concrete pours, Because it is sometimes desirable to insert such non--slip dowels or rebar into a prepoured and set concrete slab, it is further desirable to provide apparatus to facilitate insertion and or grouting in place of such rod, without the need for drilling or cutting of the existing concrete slab.
Accordingly, there remains a need in the art for methods and/or device s for facilitating the proper placement of slip dowels and non-slip dowels in various vertical and horizontal concrete applications.
SLIL~1MARY OF THE INVENTION
In accordance with the present invention, there is provided a slip dowel placement sleeve comprising a generally cylindrical tube or sheath having a preferrably open proximal end, a closed distal end and a generally hollow interior compartment. A perpendicular flange extends at least part~.ally about the proximal end of the sheath. The flange is adapted to be rapidly mounted to a conventional form by suitable fasteners such as nails or staples whereby multiple sleeves may be dispdsed in an array upon the form. Accordingly, the slap dn~el .
placement leaves, when attached to the form extend outwardly from one side of the form, extending parallel into an open area whexe a first concrete ppur is to be made: Thereafter, the first pour is completed and allowed to set. After the pour had set, the form is separated from the slip dowel placement sleeves and is remov~c~, leaving the sleeves ~.n place v~i~hin the fist pour.
Multiple slip dowels having o~xtside diameters slightly less than the inner diameter of the placement sleeves are then inserted into each slip dowel placement sleeve and w °~5-permitted to extend therefrom into a neighboring space where a second pour is to be made, Thereafter the second pour is made and allowed to set. As a result, the portion of each slip dowel which extends into the second pour will be held firmly within the concrete of the second pour while that portion of each slip dowel which resides within the slip dowel placement sleeves of the first pour will be germitted to slip longitudina7.ly due to the loose fit of the slip dowel rod c~ithin the placement sleeve, Accordingly, the slip dowels will prevent the cold joint between the two pours from buckling or~undergoing angular movement while, at the same time permitting, longitudinal expansion and contraction of the pours:
Further, in accordance with 'the invention, the slip dowel placement sleeve may be configured with a slight proximal to distal end taper so a~ to facilitate extraction of the placement sleeve from the first concrete slab upon stripping of the form, ttaereby leaving an open cylindrical void within the slab. The resultant cylindrical void will be specifically sized to permit insertion and sli.dable movement of the s7.ip ~lowel.s without the need for time consuming and expensive drilling operations. Also, the extraction of the placemeyt sleeves will permit them ~to be reused, thereby lowering cost:
Still further in accordance with the invention, the dowel rod placement sleeves of the present invent~:on may .
be specifically configured to accr~modate and hold non-slap dowel rod or rebar. The dowel rod placement tube employed in such- z~on~slip dowel appliaat'xox~s will generally comprise a corrugated "grout tube" far facilitating placement of the non-~~lip dowrel or rebar. In such embodime~xt, the '°grout tube'° will be generally in the configuration of 'the above described slip dowel placement sleeve and will in addition be pxo~ided with a series of annular ridges forming indentations i.e. an irregular surface a7.ong the outer surface of the sleeve, and also °
6°
forming annular indentations or intrusions into the inner cavity of the sleeve. As such, each grout tube will remain firmly implanted within a surrounding concrete pour. Thereafter, textured dowel rod or rebar may be inserted inside the inner cavity of the sleeve with grouting material or other adhesive material or filler filling the space to firmly bond the bar within the sleeve. As the grouting material, adhesive or filler sets, the rebar or textured dowel will be firmly held within the grout tube in a nonslipping manner.
BRIEF DESCRIPTION OF THE DRAWINGS
These as wel l as other futures of the present invention will become more apparent upon reference to the drawings wherein:
Figure 1 is a perspective view of a preferred slip dowel placement sleeve of the present invention.
Figure 2 is a perspective view of three separate preferred slip dowel placement sleeves of the present invention nailed to a section of wooden concrete farm.
Figure 3 is a cutaway view of a poured concrete slab abutted by a section of wooden concrete fo~em and having a plurality of preferred slip dowel placement sleeves of the present invention extending thereinto.
Figure 4 is a cutaway perspective view of a poured concrete slab having a plurality of ship dower placement sleeves remaining th~:rein following stripping away of a .
portion of the attendant aon~crete dorm.
Figure 5 zs a longitudinal sectional view of a cold joint formed between two poured concrete slabs with a slip dowel extending therethrough and positioned within. a preferred slip dowel placement sleeve of the present invention:
Figure 6 is an elevatic~nal view of a second preferred embodiment of the inventican comprising an extractable slip dowel placement sleeve of tapered configuration.
Figure 7 is a perspective v~.e~w of a third preferred _~..
embodiment of the present invention comprising a corrugated "grout tube" for placement of non-slip dowel or rebar.
Figure 8 is a longitudinal sectional view showing a cold joint between two poured concrete slabs, with a section of rebar extending therethrough and positioned within a corrugated "grout tube" of the present invention.
Figure 9 is a partial perspective view of a preferred slip dowel placement sleeve of the present invention having a plurality of gussets extending between the proximal portion of the 'tubular ~ sleeve and the perpendicularly attached rectangular flange to lend rigidity and support to the slip dowel placement sleeve during use.
DETAIILED DESCRIPTLON OF 'fHE PREFERRED EMBODIMENTS
The accompanying drawings are provided fox purposes of illustrat~.ng presently preferred embodiments of the inventxoh and are not intended:to limit the scope of the invention in any way.
Referring now to the drawings, Figures 1 through 5 pertain to the basic slip dower placement sleeve of the present invention, while figures 5 through 9 pertain to additional embodiments wherein var~.ous additions, modifications, and/or alterations have been made o the basic sleeve shown in Figures 1 - 5 for the purposes o~
further f aci~litating its utility and/or permitting the use , of non-slip dowel or rebar within a "grout tube"
applicatii~n:
As shown i.n Figu~P 1, the basic slip dowel placement sleeve 10 of the a.nvention comprises a generally cylindrical dowel recea.ving sheath 12 having a closed distal end l4, a prefexrabl~ open p~'oximal end 16, and a hollow interior compartment .formed therewithin. A
generally rectangular flange 18 extends perpendicularly about the proximal end 15 of the sheath. 12: A central aperture is formed in the; flange 18 so ae to permit _8_ passage of a dowel rod through the flange and into the open inner compartment of the sheath 12. Plural apertures 20, 22, 24, and 26 are formed near each corner of the flange 18 to permit nailing or stapling of the flange to the surface of a wooden concrete form or other surface.
Preferrably, the sleeve 10 is integrally formed of a plastic material fabricated by conventional molding techniques.
The manner in which the basic slip dowel positioning IO sleeves 10 are employed is illustrated in Figures 2 through 5. As shown, a serie s of individual slip dowel placement sleeves lOA, lOB, 1OC. a.nd~ 1OD are positioned and affixed, in an array along the inner surface of a section of wooden concrete form 30 such tl2at each individual sleeve 10A, lOD, lOC, lOD extends perpendicularly from the inner surface of the form 30 in substantially parallel disposition.' The attachment of the dowel rod, placement' apparatus, 10A, 10B, lOC, lOD to form 30 is made by passing Maples or small head nails through the apertures 20, 2~, 24, 26 of flanges 18A ° D. Thereafter, the form 30 is held firmly in position by stakes 32, 34. A first concrete pour is made within the form 30 'so as to form first concrete slab 36:~ After slab 36 has sit, the f~rm 30 is stripped away, separating the individual flanges, 18A ° D
and their associated nail or staple fasteners from the .
inner surface of the farm 30. Such stripping away of the form 30 leaves the ' ~.ndividual dowel rod positioning sleeves.lOA - D in a para2lel array within the slab 36 while the proximal flanges 18A - D thereof reside flush with the formed edge 3~ of slab 35:
Sections of smooth dr~wel 40, 41, 42 acre then inserted through apertures ~,ocated in flanges 18A - D and advanced distally into the longitudinal inner cavities of the dowel receiving sheaths of sheaves 10A ~- D. The portion of the dowel rods 40, 41, .42 advanced in~.o the sleeves l0A - D
will remain slidably disposed therein while the remaining portion of dowel rods 40, 41, 42 extend outwardly into an adjacent space 46 wherein a second concrete pour is to be made.
Thereafter, concrete is poured into space 46 in a conventional manner and allowed to set, thereby forming a second concrete slab 48. A cold joint or seam 50 extends between the first slab 36 and the second slab 48. Through use of the dowel rod positioning sleeves l0A - D of the present invention, the dowel rods 40, 41, 42 remain parallel to one another and longitudinally slidable within the first slab 36 while being firmly cured in place within second slab 48. By such arrangement, the individual first 36 and second 48 slabs are permitted to undexgo longitudinal expansion and contraction alorac~ the dowels 40, 41 and 42 while at the same time be~.ng prevented from buckling or undergoing vertical or an~u~.ax displaeement at the cold joint 50.
Many modifications, alterations and/or additions may be made to the basic slip dowel positioning apparatus 10.
Several such modifications, alterations and add~.tions are illustrated in Figures 6 through 9. Referring specifically to Figure 6, the y slip dowel pasitioning apparatus of the present invention day be configured sc~ as to be "strippable" or extractable from the first concrete pour, thereby leaving an open cylindrical vo3.d within the first concrete slab, so as to permit insertion of the desired dowel .rods without requiring continued presence of the dowel rod positioning apparatus.
The extractable or °'strippable" positioning apparatus 100 of the invention differs from the basic positioning apparatus 10 in that the outer surface of the dower receiving sheath 120 of the ex~raotable apparatus 100 is distally tapered suah that the distal end 140 thereof is smaller than the proximal end 160. The proximal flange 180 of the extractable apparatus 100 is structurally the _10_ same as that of the basic apparatus 10 described in Figure 1. However, the provision of the tapered sheath 120 permits the extractable apparatus 100wto be pulled out of the first concrete slab automatically upon stripping of the form from the slab, thereby leaving an open cylindrical void within the slab. The extracted apparatus 100 may then be reused in subsequent concrete pours.
Another modified embodiment of the invention shown in Figure 7 comprises a corrugated or ribbed non-slip dowel positioning apparatus or ''grout tuba" intended for use with textured dowel or rebar in applications where longitudinal slippage of the bar is not desired.
Specifically, referring to Figure 7 the corrugated or ribbed ''grout tube" 200 comprises a corrugated sheath 220 having a closed distal end 240 and an open prox~.~nal end 260 with a flange 280 positioned on the praximal'end 260 in a manner substantially identical to that of the laasic ' apparatus l0. Howwer, this °'grout tube" embodiment 200 differs from the basic p2a~ement sleeve 10 in that the sheath 220 of the ''grout tube°' is provided with a multiplicity of annular ribs 282 upon the hater surface of the sheath 220 and further forming indentations within the inner cavity thereof, Such corrugated or ~ibbad construction firmly holds the ..grout tube" in a, set ~ .
position within the center of a concrete slab 360a ~, section of reb'ar 400 is inserted into the inner cavity of .
the apparatus with a quantity of ~on~rentional grouting material 402 being applied so as to fill the space therewithin; As the grouting imaterial 402 hardens it serves to hold the rebar 400 firmly in paace within the "grout tube'' 200: The remaining'portzon of the rebar 400 extends into an adaoining open area. where 3t 3aecomes aet within a poured second slab 480 such that the rebar w~:ll be firmly held within First flab 360 by ' way of the grouting material 402- and grout tube while the opposite end of the rebar' is firmly held within a second poured concrete slab, By such arrangement, the first and second concrete slabs 360 and X80 are prevented from moving longitudinally as well as angularly along cold joint 500.
A further modification of the basic device which is contemplated by the invention is the provision of fins or gussets 60 as shown in Figure 9. Such fins or gussets are of generally triangular configuration and extend between the proximal end l6 of the tubular sheath l2 and the inner surface of flange l8 so ws to impart additional strength ZO and rigidity to tha apparatus,. Of course, vaxious other types of fins, g~assetts, supports, or braces may be employed and, such fins need not be limited to the triangular configurations shown in Figure 9.
Although sevaral possible additions, modifications and alterations of the basic-invention have'bsen described herein, it must be appreciated that mainy more additions, modifications and alterations will likely be apparent to ' those skilled in the art. Accordingly, it is intended that all such conceivable additions, alterations and modifications be included within the scope of the following claims and the eguivalents thereof.
The second popular method of placing slip dowels involves the use of wax treated cardboard sleeves positioned over one end of each individual dowel.
According to such method, a series of holes are drilled through one edge of a concrete form and smooth dowels are advanced through each such hole. Wax treated cardboard sleeves are placed over one end of each such dowel and the first pour is made within the form. After the first pour has set, the previously drilled form is stripped avaay leaving the individual dowels extending into a neighboring open space where the second pour a.s to ne matte.
Subsequently, the- second pour is made and permitted to cure. Thereafter, the slip dowels will be firmly held by the concrete of the second pour but will be permitted to longitudinally slide against the inner su~fac~s of the wax treated cardboard sleeves ~ within the first pour. Thus, the waxed cardboard sleeves facilitate longitudinal slippage of the dowels, while a~ the same time holding the two concrete slabs in a common plane, and preventing undesirable buckling or angular movement thereof.
This second method, whi7.e. presently popular, is nonetheless associated with numerous deficierleies. For example, after the first pour has been made, tY~e free ends of the dowels are likely to project as much as 18°' through the forms and in~.o the' open space allowed fox' the second .
pour. because the drilled section of form must be advanced over these exposed sections of dowel to accomplish stripping ox 'removal of the dorm,' it is not infrequent for the exposed portions of the dowels to become bent and, ~thusr nonparalleJ.. Also, the drilled section of form may become damaged or broken during the removal process, thereby precluding as s reuse.
It is unfortunate that both of the above described popular mefi,hods of placing ship dowels often result in the dowels being fa~nally positioned at various angles rather than in the desired parallel array. When such occurs, the necessary slippage of the dowels is impeded or prevented.
In other applications wherein longitudinal slippage of the dowels is not desired, it is common to employ non-slip dowels or rebar disposed through two or more adjacent concrete pours, Because it is sometimes desirable to insert such non--slip dowels or rebar into a prepoured and set concrete slab, it is further desirable to provide apparatus to facilitate insertion and or grouting in place of such rod, without the need for drilling or cutting of the existing concrete slab.
Accordingly, there remains a need in the art for methods and/or device s for facilitating the proper placement of slip dowels and non-slip dowels in various vertical and horizontal concrete applications.
SLIL~1MARY OF THE INVENTION
In accordance with the present invention, there is provided a slip dowel placement sleeve comprising a generally cylindrical tube or sheath having a preferrably open proximal end, a closed distal end and a generally hollow interior compartment. A perpendicular flange extends at least part~.ally about the proximal end of the sheath. The flange is adapted to be rapidly mounted to a conventional form by suitable fasteners such as nails or staples whereby multiple sleeves may be dispdsed in an array upon the form. Accordingly, the slap dn~el .
placement leaves, when attached to the form extend outwardly from one side of the form, extending parallel into an open area whexe a first concrete ppur is to be made: Thereafter, the first pour is completed and allowed to set. After the pour had set, the form is separated from the slip dowel placement sleeves and is remov~c~, leaving the sleeves ~.n place v~i~hin the fist pour.
Multiple slip dowels having o~xtside diameters slightly less than the inner diameter of the placement sleeves are then inserted into each slip dowel placement sleeve and w °~5-permitted to extend therefrom into a neighboring space where a second pour is to be made, Thereafter the second pour is made and allowed to set. As a result, the portion of each slip dowel which extends into the second pour will be held firmly within the concrete of the second pour while that portion of each slip dowel which resides within the slip dowel placement sleeves of the first pour will be germitted to slip longitudina7.ly due to the loose fit of the slip dowel rod c~ithin the placement sleeve, Accordingly, the slip dowels will prevent the cold joint between the two pours from buckling or~undergoing angular movement while, at the same time permitting, longitudinal expansion and contraction of the pours:
Further, in accordance with 'the invention, the slip dowel placement sleeve may be configured with a slight proximal to distal end taper so a~ to facilitate extraction of the placement sleeve from the first concrete slab upon stripping of the form, ttaereby leaving an open cylindrical void within the slab. The resultant cylindrical void will be specifically sized to permit insertion and sli.dable movement of the s7.ip ~lowel.s without the need for time consuming and expensive drilling operations. Also, the extraction of the placemeyt sleeves will permit them ~to be reused, thereby lowering cost:
Still further in accordance with the invention, the dowel rod placement sleeves of the present invent~:on may .
be specifically configured to accr~modate and hold non-slap dowel rod or rebar. The dowel rod placement tube employed in such- z~on~slip dowel appliaat'xox~s will generally comprise a corrugated "grout tube" far facilitating placement of the non-~~lip dowrel or rebar. In such embodime~xt, the '°grout tube'° will be generally in the configuration of 'the above described slip dowel placement sleeve and will in addition be pxo~ided with a series of annular ridges forming indentations i.e. an irregular surface a7.ong the outer surface of the sleeve, and also °
6°
forming annular indentations or intrusions into the inner cavity of the sleeve. As such, each grout tube will remain firmly implanted within a surrounding concrete pour. Thereafter, textured dowel rod or rebar may be inserted inside the inner cavity of the sleeve with grouting material or other adhesive material or filler filling the space to firmly bond the bar within the sleeve. As the grouting material, adhesive or filler sets, the rebar or textured dowel will be firmly held within the grout tube in a nonslipping manner.
BRIEF DESCRIPTION OF THE DRAWINGS
These as wel l as other futures of the present invention will become more apparent upon reference to the drawings wherein:
Figure 1 is a perspective view of a preferred slip dowel placement sleeve of the present invention.
Figure 2 is a perspective view of three separate preferred slip dowel placement sleeves of the present invention nailed to a section of wooden concrete farm.
Figure 3 is a cutaway view of a poured concrete slab abutted by a section of wooden concrete fo~em and having a plurality of preferred slip dowel placement sleeves of the present invention extending thereinto.
Figure 4 is a cutaway perspective view of a poured concrete slab having a plurality of ship dower placement sleeves remaining th~:rein following stripping away of a .
portion of the attendant aon~crete dorm.
Figure 5 zs a longitudinal sectional view of a cold joint formed between two poured concrete slabs with a slip dowel extending therethrough and positioned within. a preferred slip dowel placement sleeve of the present invention:
Figure 6 is an elevatic~nal view of a second preferred embodiment of the inventican comprising an extractable slip dowel placement sleeve of tapered configuration.
Figure 7 is a perspective v~.e~w of a third preferred _~..
embodiment of the present invention comprising a corrugated "grout tube" for placement of non-slip dowel or rebar.
Figure 8 is a longitudinal sectional view showing a cold joint between two poured concrete slabs, with a section of rebar extending therethrough and positioned within a corrugated "grout tube" of the present invention.
Figure 9 is a partial perspective view of a preferred slip dowel placement sleeve of the present invention having a plurality of gussets extending between the proximal portion of the 'tubular ~ sleeve and the perpendicularly attached rectangular flange to lend rigidity and support to the slip dowel placement sleeve during use.
DETAIILED DESCRIPTLON OF 'fHE PREFERRED EMBODIMENTS
The accompanying drawings are provided fox purposes of illustrat~.ng presently preferred embodiments of the inventxoh and are not intended:to limit the scope of the invention in any way.
Referring now to the drawings, Figures 1 through 5 pertain to the basic slip dower placement sleeve of the present invention, while figures 5 through 9 pertain to additional embodiments wherein var~.ous additions, modifications, and/or alterations have been made o the basic sleeve shown in Figures 1 - 5 for the purposes o~
further f aci~litating its utility and/or permitting the use , of non-slip dowel or rebar within a "grout tube"
applicatii~n:
As shown i.n Figu~P 1, the basic slip dowel placement sleeve 10 of the a.nvention comprises a generally cylindrical dowel recea.ving sheath 12 having a closed distal end l4, a prefexrabl~ open p~'oximal end 16, and a hollow interior compartment .formed therewithin. A
generally rectangular flange 18 extends perpendicularly about the proximal end 15 of the sheath. 12: A central aperture is formed in the; flange 18 so ae to permit _8_ passage of a dowel rod through the flange and into the open inner compartment of the sheath 12. Plural apertures 20, 22, 24, and 26 are formed near each corner of the flange 18 to permit nailing or stapling of the flange to the surface of a wooden concrete form or other surface.
Preferrably, the sleeve 10 is integrally formed of a plastic material fabricated by conventional molding techniques.
The manner in which the basic slip dowel positioning IO sleeves 10 are employed is illustrated in Figures 2 through 5. As shown, a serie s of individual slip dowel placement sleeves lOA, lOB, 1OC. a.nd~ 1OD are positioned and affixed, in an array along the inner surface of a section of wooden concrete form 30 such tl2at each individual sleeve 10A, lOD, lOC, lOD extends perpendicularly from the inner surface of the form 30 in substantially parallel disposition.' The attachment of the dowel rod, placement' apparatus, 10A, 10B, lOC, lOD to form 30 is made by passing Maples or small head nails through the apertures 20, 2~, 24, 26 of flanges 18A ° D. Thereafter, the form 30 is held firmly in position by stakes 32, 34. A first concrete pour is made within the form 30 'so as to form first concrete slab 36:~ After slab 36 has sit, the f~rm 30 is stripped away, separating the individual flanges, 18A ° D
and their associated nail or staple fasteners from the .
inner surface of the farm 30. Such stripping away of the form 30 leaves the ' ~.ndividual dowel rod positioning sleeves.lOA - D in a para2lel array within the slab 36 while the proximal flanges 18A - D thereof reside flush with the formed edge 3~ of slab 35:
Sections of smooth dr~wel 40, 41, 42 acre then inserted through apertures ~,ocated in flanges 18A - D and advanced distally into the longitudinal inner cavities of the dowel receiving sheaths of sheaves 10A ~- D. The portion of the dowel rods 40, 41, .42 advanced in~.o the sleeves l0A - D
will remain slidably disposed therein while the remaining portion of dowel rods 40, 41, 42 extend outwardly into an adjacent space 46 wherein a second concrete pour is to be made.
Thereafter, concrete is poured into space 46 in a conventional manner and allowed to set, thereby forming a second concrete slab 48. A cold joint or seam 50 extends between the first slab 36 and the second slab 48. Through use of the dowel rod positioning sleeves l0A - D of the present invention, the dowel rods 40, 41, 42 remain parallel to one another and longitudinally slidable within the first slab 36 while being firmly cured in place within second slab 48. By such arrangement, the individual first 36 and second 48 slabs are permitted to undexgo longitudinal expansion and contraction alorac~ the dowels 40, 41 and 42 while at the same time be~.ng prevented from buckling or undergoing vertical or an~u~.ax displaeement at the cold joint 50.
Many modifications, alterations and/or additions may be made to the basic slip dowel positioning apparatus 10.
Several such modifications, alterations and add~.tions are illustrated in Figures 6 through 9. Referring specifically to Figure 6, the y slip dowel pasitioning apparatus of the present invention day be configured sc~ as to be "strippable" or extractable from the first concrete pour, thereby leaving an open cylindrical vo3.d within the first concrete slab, so as to permit insertion of the desired dowel .rods without requiring continued presence of the dowel rod positioning apparatus.
The extractable or °'strippable" positioning apparatus 100 of the invention differs from the basic positioning apparatus 10 in that the outer surface of the dower receiving sheath 120 of the ex~raotable apparatus 100 is distally tapered suah that the distal end 140 thereof is smaller than the proximal end 160. The proximal flange 180 of the extractable apparatus 100 is structurally the _10_ same as that of the basic apparatus 10 described in Figure 1. However, the provision of the tapered sheath 120 permits the extractable apparatus 100wto be pulled out of the first concrete slab automatically upon stripping of the form from the slab, thereby leaving an open cylindrical void within the slab. The extracted apparatus 100 may then be reused in subsequent concrete pours.
Another modified embodiment of the invention shown in Figure 7 comprises a corrugated or ribbed non-slip dowel positioning apparatus or ''grout tuba" intended for use with textured dowel or rebar in applications where longitudinal slippage of the bar is not desired.
Specifically, referring to Figure 7 the corrugated or ribbed ''grout tube" 200 comprises a corrugated sheath 220 having a closed distal end 240 and an open prox~.~nal end 260 with a flange 280 positioned on the praximal'end 260 in a manner substantially identical to that of the laasic ' apparatus l0. Howwer, this °'grout tube" embodiment 200 differs from the basic p2a~ement sleeve 10 in that the sheath 220 of the ''grout tube°' is provided with a multiplicity of annular ribs 282 upon the hater surface of the sheath 220 and further forming indentations within the inner cavity thereof, Such corrugated or ~ibbad construction firmly holds the ..grout tube" in a, set ~ .
position within the center of a concrete slab 360a ~, section of reb'ar 400 is inserted into the inner cavity of .
the apparatus with a quantity of ~on~rentional grouting material 402 being applied so as to fill the space therewithin; As the grouting imaterial 402 hardens it serves to hold the rebar 400 firmly in paace within the "grout tube'' 200: The remaining'portzon of the rebar 400 extends into an adaoining open area. where 3t 3aecomes aet within a poured second slab 480 such that the rebar w~:ll be firmly held within First flab 360 by ' way of the grouting material 402- and grout tube while the opposite end of the rebar' is firmly held within a second poured concrete slab, By such arrangement, the first and second concrete slabs 360 and X80 are prevented from moving longitudinally as well as angularly along cold joint 500.
A further modification of the basic device which is contemplated by the invention is the provision of fins or gussets 60 as shown in Figure 9. Such fins or gussets are of generally triangular configuration and extend between the proximal end l6 of the tubular sheath l2 and the inner surface of flange l8 so ws to impart additional strength ZO and rigidity to tha apparatus,. Of course, vaxious other types of fins, g~assetts, supports, or braces may be employed and, such fins need not be limited to the triangular configurations shown in Figure 9.
Although sevaral possible additions, modifications and alterations of the basic-invention have'bsen described herein, it must be appreciated that mainy more additions, modifications and alterations will likely be apparent to ' those skilled in the art. Accordingly, it is intended that all such conceivable additions, alterations and modifications be included within the scope of the following claims and the eguivalents thereof.
Claims (5)
1. A concrete dowel placement apparatus comprising:
a dowel receiving sheath comprising a generally tubular body having an outer surface, an open proximal end, a closed distal end and a hollow interior compartment extending axially therein;
a generally rectangular flange extending perpendicularly about said open proximal end of said sheath, said flange being formed to extend completely about said open proximal end and having an inner surface and a generally flat outer surface, wherein said outer surface of said flange is held in abutting contact with a flat surface of a concrete form to prevent seepage of concrete into said hollow interior compartment of said sheath; and at least one strength imparting gusset extending between a proximal portion of said outer surface of said sheath and said inner surface of said flange.
a dowel receiving sheath comprising a generally tubular body having an outer surface, an open proximal end, a closed distal end and a hollow interior compartment extending axially therein;
a generally rectangular flange extending perpendicularly about said open proximal end of said sheath, said flange being formed to extend completely about said open proximal end and having an inner surface and a generally flat outer surface, wherein said outer surface of said flange is held in abutting contact with a flat surface of a concrete form to prevent seepage of concrete into said hollow interior compartment of said sheath; and at least one strength imparting gusset extending between a proximal portion of said outer surface of said sheath and said inner surface of said flange.
2. The concrete dowel placement apparatus of Claim 1 wherein a plurality of apertures are formed in said flange, said apertures being sized, configured and positioned to permit passage of nails therethrough in such manner as to facilitate nailing of said flange to said flat surface of said concrete form such that said flat outer surface of said flange is held in abutting contact with said flat surface of said foam.
3. The concrete dowel placement apparatus of Claim 1 wherein said interior compartment of said dowel receiving sheath is sized and configured to permit a dowel rod to be slidably inserted therein and to allow said dowel rod to remain longitudinally slidable therewithin so long as said dowel rod resides within said interior compartment of said sheath.
4. The concrete dowel placement apparatus of Claim 1 wherein said apparatus is formed of molded plastic.
5. The concrete dowel placement apparatus of Claim 1 wherein said closed distal end of said dowel receiving sheath comprises a non-removable end closure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2029922 CA2029922C (en) | 1990-11-14 | 1990-11-14 | Concrete dowel placement sleeves |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2029922 CA2029922C (en) | 1990-11-14 | 1990-11-14 | Concrete dowel placement sleeves |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2029922A1 CA2029922A1 (en) | 1992-05-15 |
| CA2029922C true CA2029922C (en) | 2001-05-08 |
Family
ID=4146421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2029922 Expired - Fee Related CA2029922C (en) | 1990-11-14 | 1990-11-14 | Concrete dowel placement sleeves |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2029922C (en) |
-
1990
- 1990-11-14 CA CA 2029922 patent/CA2029922C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2029922A1 (en) | 1992-05-15 |
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| Date | Code | Title | Description |
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| EEER | Examination request | ||
| MKLA | Lapsed |