CA1306369C - Expansion joint and form for concrete floors - Google Patents
Expansion joint and form for concrete floorsInfo
- Publication number
- CA1306369C CA1306369C CA000560493A CA560493A CA1306369C CA 1306369 C CA1306369 C CA 1306369C CA 000560493 A CA000560493 A CA 000560493A CA 560493 A CA560493 A CA 560493A CA 1306369 C CA1306369 C CA 1306369C
- Authority
- CA
- Canada
- Prior art keywords
- concrete
- panel
- main panel
- board
- expansion joint
- 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 - Lifetime
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F15/00—Flooring
- E04F15/12—Flooring or floor layers made of masses in situ, e.g. seamless magnesite floors, terrazzo gypsum floors
- E04F15/14—Construction of joints, e.g. dividing strips
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/02—Arrangement or construction of joints; Methods of making joints; Packing for joints
- E01C11/04—Arrangement or construction of joints; Methods of making joints; Packing for joints for cement concrete paving
- E01C11/14—Dowel assembly ; Design or construction of reinforcements in the area of joints
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/50—Removable forms or shutterings for road-building purposes; Devices or arrangements for forming individual paving elements, e.g. kerbs, in situ
- E01C19/502—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes
- E01C19/504—Removable forms or shutterings, e.g. side forms; Removable supporting or anchoring means therefor, e.g. stakes adapted to, or provided with, means to maintain reinforcing or load transfer elements in a required position
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C9/00—Special pavings; Pavings for special parts of roads or airfields
- E01C9/001—Paving elements formed in situ; Permanent shutterings therefor ; Inlays or reinforcements which divide the cast material in a great number of individual units
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Floor Finish (AREA)
- Building Environments (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An expansion joint and form for concrete floors, consisting of a free-standing assembly comprising a vertical asphaltic board, a metallic panel flatly abutting against the asphaltic board, and a number of load transfer dowels or rods slidingly passing horizontally through the board and panel to extend on each side of the panel and board. The rod partially engages at one end a sleeve and one rod section is covered with grease. After fresh concrete is successively poured on each side of the expansion joint, the concrete will harden unto the board, the panel and the sleeve exclusively of the rod section covered with grease. Hence, the rod will be movable relative to the sleeve and surrounding concrete slab, allowing for relative horizontal displacement of the pair of proximate concrete slabs
An expansion joint and form for concrete floors, consisting of a free-standing assembly comprising a vertical asphaltic board, a metallic panel flatly abutting against the asphaltic board, and a number of load transfer dowels or rods slidingly passing horizontally through the board and panel to extend on each side of the panel and board. The rod partially engages at one end a sleeve and one rod section is covered with grease. After fresh concrete is successively poured on each side of the expansion joint, the concrete will harden unto the board, the panel and the sleeve exclusively of the rod section covered with grease. Hence, the rod will be movable relative to the sleeve and surrounding concrete slab, allowing for relative horizontal displacement of the pair of proximate concrete slabs
Description
3(:~3~3 FIELD OF THE INVENTION
This invention relates to expansion ~oints for concrete floors, BACKGROUND OF TH~ INVENTION
It is known to use expanslon ~oints within concrete floorings, to take into account thermal expansion\retraction of the concrete, Indeed, there must be provided means whereby some level of horizontal relative play of ad~acent concrete slabs be possible, otherwise the flooring will crack and its integrity wlll become at stake, Typical prior art includes U,S. patents Nos 2,171,709 issued in 1939; 3,395,507 issued in 1968; and 3,572,22S issued in early 1971. All these ~expired) patents show some form of panel assembly vertically mounted between a proxlmate pair of concrete blocks or slabs. The panel assembly defines a compressible section whose thickness may vary in accordance with relative horizontal displacements of the slabs. These expanslon ~oints further include a large dowel extending hori~ontally, so as to prevent relative vertical displacement of the slabs with respect ~0 to one another.
In the first'above-mentioned patent, issued to Niel, Jr, there is shown in figure 3 one concrete slab being anchored to the sub-floor G by vertical anchor stakes 15, 20, while the other concrete slab is engaged by the horizontal dowel 14 which pro~ect from said one concrete slab.
One drawback of Niel, Jr's expansion joint ls that the -` ~36~3~
concrete will harden unto the whole of the horizontal dowel 14 twhich ~xtends through both concrete slabs), and, since the dowel is therefore integral to the two concrete slabs, further compression of the compression board sandwiched between the two S sla~s is impossible while displacement of the slabs away from each other will be very difficult.
OBJECT OF THE INVENTION
Therefore, the main object of the present invention is to provide an expansion joint for concrete floors, characterized by its increased efficiency and low manufacturing cost.
SUMMARY OF THE INVENTION
In accordance with the stated object of the invention, there is disclosed the comblnation of two adjacent slabs of concrete flooring with an expansion joint therebetween, lS comprising: .
first and second, ground supported ad~acent concrete slabs;
a compression board, made from a compressible at least partially resilient material;
a rigid elongated panel against which is applied said board, said .~0 board and panel having longltudinally spaced, registering bores, said board and panel being sandwiched in vertlcal position between said slabs;
a dowel rod, having an intermedlate sectlon, extending throu~h ~ach registering pair of panel bore and board bore, and first and second end sections extending beyond opposite sides of said board and panel and into: said slabs, said first end section being coated with grease;
and a sleeve member at least partially enyaged at its inner end by said rod first end section and closed at its outer end, said rod being slidingly displaceable therein;
the concrete of said first and second slabs adhering to said sleeve member and to said rod exclusively of said rod flrst section because of said grease, wherein, upon thermal gradlents being sustained by sald slabs and in view of taking into account the dimensional variations occuring during concrete curing, the thickness of said compression board may vary and said rod first end section will move relative to said first slab and further engage into or retract from said sleeve member.
Profltably, said compression board is an asphaltic lS~ board. There may be further provlded a first flange extending orthogonally outwardly from the bottom edge of said rigid panel;
and also further included a second flange, extending orthogonally outwardly from the intermediate sectlon of said rigid panel, and spaced hook members downwardly dependent from the latter flange in reyister with corresponding said rods and supportingly engageable by the latter.
Advantageously, stakes extend through said first and second flanges and are driven into said ground.
It is envisioned that an expanslon gap be defined at the top edge of sald compression board, between the upwardly offset top edge portions ~f said concrete slabs and that there ~3~6~
be further included a sealing strip, frictionally engaged into said expansion gap.
The expansion joint, as such is so constructed that it serves also as a concrete form during pouring and curing of the concrete flooring made of concrete slabs.
The ends of the panels are preferably so shaped that they can be interdigitated for automatic vertlcal alignment of a~acent panels, BRIEF DESCRIPTION OF THE DRAWlNGS
Figure 1 is a perspective vie~ of a combined concrete form and expansion joint for a concrete floor in accordance with the teachings of the invention;
Figure la is a front elevation of the two mating.ends of two ad~acent panels;
Figure 2 is a front elevational view of the form and exp~nsion ~oint;
Figure 3 is a top plan vlew of the expansion ~oint embedded into a partly finished concrete flooring;
and Figure 4 is a partly broken vertical sectional view of said flooring and embedded expansion joint thereof, DETAILED DESCRIPTION OF THE INVENTION
The expansion joint of the invention is denoted 10 and consists of an elongated rectangular asphaltic board 12 against which is fixedly applied an elongated metallic panel 14, of a dimension similar to that of board 12 but defining a top edge 14A
~3~
extending short of the corresponding top edge 12A of board 12.
Board 12 should be made of a mat~rial which is compressible and at least partially resilient. Board 12 includes a few bores 16 and panel 14 includes also a few bores 18 adapted to come in register with bores 16. An elongated dowel rod 20 is ln slidable engagement through each pair of bores 16-18.
The bottom end of the metal panel 14 includes an lntegral flange 22, being orthogonal to panel 14. Flange 22 is in register with the bottom edge of asphaltic board 12, so as to flatly abut a~ainst the horlzontal top surface of a rocky bed R
at the base of the undertaking. Moreover, panel 14 lncludes a intermediate outturned flange 24, similar to flange 22. Flange 24 is slightly above the level of bores 18 and includes at its free end a few downwardly dependent hooks 26, each in register with a given bore 18 so as to be slidably engaged by a corresponding rod 20. Hence, hooXs 26 and bores 16-18 support each rod 20 in horizontal position, with the intermediate section of these rods 2Q being at the level of bores.16-18. Flange 22 is urther connected to flange 24 by a few anchor stakes 28 driven into the rock bed R, as suggested in figures 2 and 4, t.o maintain the 1anges 22 and 24 parallel to the ground or rock bed R, so that the panel 14 serves as a concrete form during pouring and curing of a concrete slab within the confines of a four sided cavlty defined by said forms or by said forms and a wall W.
As illustrated in figures 1-la, each panel 14 has a female end 14a with cut out end portions 22a, 24a of flanges 22 ~ ~L3~3~
and 24, and a male end 14b with a cut out end portion 19c of panel end 14b. Therefore, adjacent panels 14 can be interdigitated and maintained in alignment to provide a straight form and joint.
In accordance with the heart of the invention, the outer end of rod 20 is at least partially engaged into a sleeve member 30 being closed at its outar end 30A, wherein a displacement gap is defined within the sleeve 30; and the section rod 20a which extends from panel 14 to sleeve 30 is covered with grease G, for a purpose outlined hereinbelow.
In operation, a number of panels 14 and asphaltic boards 12 are conventionally laid on the rocky bed R in orthogonal relation, wherein square or rectangular cavities S are defined, Wall W forms the fourth side of adjacent cavities, Rods 20 and sleeves 30 are then positioned, Fresh concrete is then successively poured into each cavity S and left to cure to form concrete slabs C, Prior to concrete pouring, a metallic reinforcing grid G of conventional make is preferably installed in cavity S, see figure 3, It i5 understood that, because of the grease pellicule surrounding rod section 20a (figure 4), concrete will not adhere to the latter, This means that rod 20 will ~e able to be lengthwisely "displaceable" relative to slab C, and into sleeve 30, which sleeve will of course be ~ixedly embedded into slab C1.
~5 Since rod section 20b is preferably not coated with grease, slab C2 will adhere to the same, Since rods 20 are free to move ~ ~3~;3~
longitudinally of slab C1, temperature variations affecting the flooring will allow the expansion joints to be fully effective.
The gag 12a above the asphalt~c board 12 is conventionally filled with a sealing strip 32.
This invention relates to expansion ~oints for concrete floors, BACKGROUND OF TH~ INVENTION
It is known to use expanslon ~oints within concrete floorings, to take into account thermal expansion\retraction of the concrete, Indeed, there must be provided means whereby some level of horizontal relative play of ad~acent concrete slabs be possible, otherwise the flooring will crack and its integrity wlll become at stake, Typical prior art includes U,S. patents Nos 2,171,709 issued in 1939; 3,395,507 issued in 1968; and 3,572,22S issued in early 1971. All these ~expired) patents show some form of panel assembly vertically mounted between a proxlmate pair of concrete blocks or slabs. The panel assembly defines a compressible section whose thickness may vary in accordance with relative horizontal displacements of the slabs. These expanslon ~oints further include a large dowel extending hori~ontally, so as to prevent relative vertical displacement of the slabs with respect ~0 to one another.
In the first'above-mentioned patent, issued to Niel, Jr, there is shown in figure 3 one concrete slab being anchored to the sub-floor G by vertical anchor stakes 15, 20, while the other concrete slab is engaged by the horizontal dowel 14 which pro~ect from said one concrete slab.
One drawback of Niel, Jr's expansion joint ls that the -` ~36~3~
concrete will harden unto the whole of the horizontal dowel 14 twhich ~xtends through both concrete slabs), and, since the dowel is therefore integral to the two concrete slabs, further compression of the compression board sandwiched between the two S sla~s is impossible while displacement of the slabs away from each other will be very difficult.
OBJECT OF THE INVENTION
Therefore, the main object of the present invention is to provide an expansion joint for concrete floors, characterized by its increased efficiency and low manufacturing cost.
SUMMARY OF THE INVENTION
In accordance with the stated object of the invention, there is disclosed the comblnation of two adjacent slabs of concrete flooring with an expansion joint therebetween, lS comprising: .
first and second, ground supported ad~acent concrete slabs;
a compression board, made from a compressible at least partially resilient material;
a rigid elongated panel against which is applied said board, said .~0 board and panel having longltudinally spaced, registering bores, said board and panel being sandwiched in vertlcal position between said slabs;
a dowel rod, having an intermedlate sectlon, extending throu~h ~ach registering pair of panel bore and board bore, and first and second end sections extending beyond opposite sides of said board and panel and into: said slabs, said first end section being coated with grease;
and a sleeve member at least partially enyaged at its inner end by said rod first end section and closed at its outer end, said rod being slidingly displaceable therein;
the concrete of said first and second slabs adhering to said sleeve member and to said rod exclusively of said rod flrst section because of said grease, wherein, upon thermal gradlents being sustained by sald slabs and in view of taking into account the dimensional variations occuring during concrete curing, the thickness of said compression board may vary and said rod first end section will move relative to said first slab and further engage into or retract from said sleeve member.
Profltably, said compression board is an asphaltic lS~ board. There may be further provlded a first flange extending orthogonally outwardly from the bottom edge of said rigid panel;
and also further included a second flange, extending orthogonally outwardly from the intermediate sectlon of said rigid panel, and spaced hook members downwardly dependent from the latter flange in reyister with corresponding said rods and supportingly engageable by the latter.
Advantageously, stakes extend through said first and second flanges and are driven into said ground.
It is envisioned that an expanslon gap be defined at the top edge of sald compression board, between the upwardly offset top edge portions ~f said concrete slabs and that there ~3~6~
be further included a sealing strip, frictionally engaged into said expansion gap.
The expansion joint, as such is so constructed that it serves also as a concrete form during pouring and curing of the concrete flooring made of concrete slabs.
The ends of the panels are preferably so shaped that they can be interdigitated for automatic vertlcal alignment of a~acent panels, BRIEF DESCRIPTION OF THE DRAWlNGS
Figure 1 is a perspective vie~ of a combined concrete form and expansion joint for a concrete floor in accordance with the teachings of the invention;
Figure la is a front elevation of the two mating.ends of two ad~acent panels;
Figure 2 is a front elevational view of the form and exp~nsion ~oint;
Figure 3 is a top plan vlew of the expansion ~oint embedded into a partly finished concrete flooring;
and Figure 4 is a partly broken vertical sectional view of said flooring and embedded expansion joint thereof, DETAILED DESCRIPTION OF THE INVENTION
The expansion joint of the invention is denoted 10 and consists of an elongated rectangular asphaltic board 12 against which is fixedly applied an elongated metallic panel 14, of a dimension similar to that of board 12 but defining a top edge 14A
~3~
extending short of the corresponding top edge 12A of board 12.
Board 12 should be made of a mat~rial which is compressible and at least partially resilient. Board 12 includes a few bores 16 and panel 14 includes also a few bores 18 adapted to come in register with bores 16. An elongated dowel rod 20 is ln slidable engagement through each pair of bores 16-18.
The bottom end of the metal panel 14 includes an lntegral flange 22, being orthogonal to panel 14. Flange 22 is in register with the bottom edge of asphaltic board 12, so as to flatly abut a~ainst the horlzontal top surface of a rocky bed R
at the base of the undertaking. Moreover, panel 14 lncludes a intermediate outturned flange 24, similar to flange 22. Flange 24 is slightly above the level of bores 18 and includes at its free end a few downwardly dependent hooks 26, each in register with a given bore 18 so as to be slidably engaged by a corresponding rod 20. Hence, hooXs 26 and bores 16-18 support each rod 20 in horizontal position, with the intermediate section of these rods 2Q being at the level of bores.16-18. Flange 22 is urther connected to flange 24 by a few anchor stakes 28 driven into the rock bed R, as suggested in figures 2 and 4, t.o maintain the 1anges 22 and 24 parallel to the ground or rock bed R, so that the panel 14 serves as a concrete form during pouring and curing of a concrete slab within the confines of a four sided cavlty defined by said forms or by said forms and a wall W.
As illustrated in figures 1-la, each panel 14 has a female end 14a with cut out end portions 22a, 24a of flanges 22 ~ ~L3~3~
and 24, and a male end 14b with a cut out end portion 19c of panel end 14b. Therefore, adjacent panels 14 can be interdigitated and maintained in alignment to provide a straight form and joint.
In accordance with the heart of the invention, the outer end of rod 20 is at least partially engaged into a sleeve member 30 being closed at its outar end 30A, wherein a displacement gap is defined within the sleeve 30; and the section rod 20a which extends from panel 14 to sleeve 30 is covered with grease G, for a purpose outlined hereinbelow.
In operation, a number of panels 14 and asphaltic boards 12 are conventionally laid on the rocky bed R in orthogonal relation, wherein square or rectangular cavities S are defined, Wall W forms the fourth side of adjacent cavities, Rods 20 and sleeves 30 are then positioned, Fresh concrete is then successively poured into each cavity S and left to cure to form concrete slabs C, Prior to concrete pouring, a metallic reinforcing grid G of conventional make is preferably installed in cavity S, see figure 3, It i5 understood that, because of the grease pellicule surrounding rod section 20a (figure 4), concrete will not adhere to the latter, This means that rod 20 will ~e able to be lengthwisely "displaceable" relative to slab C, and into sleeve 30, which sleeve will of course be ~ixedly embedded into slab C1.
~5 Since rod section 20b is preferably not coated with grease, slab C2 will adhere to the same, Since rods 20 are free to move ~ ~3~;3~
longitudinally of slab C1, temperature variations affecting the flooring will allow the expansion joints to be fully effective.
The gag 12a above the asphalt~c board 12 is conventionally filled with a sealing strip 32.
Claims (6)
1. An expansion joint and form for a horizontal concrete base supported by a rock bed ground, comprising: a rigid rectangular main panel having a longitudinally edgewisely transverse integral bottom flange abutting against the ground for supporting said panel in upright position; a rectangular compression board, longitudinally edgewisely ground sup-ported and flatly abutting against the face of said panel oppo-site said bottom flange and made from a compressible partially resilient material; a few dowel rods, each transversely horizon-tally extending through a pair of registering bores in said panel and board spacedly over said bottom flange and partially slid-ably engaging at one end thereof a sleeve member which is closed at its outer end, said rods projecting from both sides of said compression board and main panel; an upper flange, trans-versely extending from and fixedly secured to an upper section of said main panel paralled to and in vertical register with said bottom flange; a few small centrally bored rigid hook plates, transversly downwardly extending from and fixedly con-nected to an outer section of said upper flange parallel to said main panel, each small bored plate being in horizontal register with said pair of said registering bores of said main panel and compression board and transversely supportingly engaged by a corresponding said dowel rod; and anchor stakes, each trans-versely extending at regular lenghtwise intervals through said upper and bottom flanges parallel to said main panel and an-choringly driven into said rock bed; wherein fresh concrete is poured first over the dowel rods sections projecting beyond said compression board at the panel side opposite to said bot-tom flange, and after complete curing of this concrete, fresh concrete is poured thereafter over the opposite dowels rods sections, whereby two opposite concrete slabs horizontally spaced by said expansion joint are thus obtained.
2. An expansion joint as defined in claim 1, wherein the height of said compression board is greater than that of said main panel, and further including a sealing strip applied against the top edge of said compression board and of such a weight as to come in register with the top edge of said concrete slabs.
3. An expansion joint as defined in claim 1, wherein the dowel rods sections projecting beyond said main panel on said upper and bottom flanges side of said main panel are coated with a grease compound.
4. At least two expansion joints as the one defined in claim 1, being endwisely orthogonally mounted to each other, and further including a large metallic grid, edgewisely supported in horizontal position by said upper flanges of the two said expansion joints, the fresh concrete being poured over said grid.
5. At least two expansion joints as the one defined in claim 1, being endwisely coaxially mounted to each other, wherein each of said upper and bottom flanges of each expansion joint defines a first lengthwise "female" end extending short of a corresponding first end edge of said main panel and an opposite second "male"
end projecting beyond a corresponding second end edge of said main panel; wherein said male and female ends constitute interdigitating connecting means.
end projecting beyond a corresponding second end edge of said main panel; wherein said male and female ends constitute interdigitating connecting means.
6. A number of expansion joints as the one defined in claim 1, being arranged in rows and columns and in combination with a corresponding number of concrete slabs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000560493A CA1306369C (en) | 1988-03-01 | 1988-03-01 | Expansion joint and form for concrete floors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000560493A CA1306369C (en) | 1988-03-01 | 1988-03-01 | Expansion joint and form for concrete floors |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1306369C true CA1306369C (en) | 1992-08-18 |
Family
ID=4137558
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000560493A Expired - Lifetime CA1306369C (en) | 1988-03-01 | 1988-03-01 | Expansion joint and form for concrete floors |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1306369C (en) |
-
1988
- 1988-03-01 CA CA000560493A patent/CA1306369C/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |