NZ244817A - Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movement - Google Patents
Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movementInfo
- Publication number
- NZ244817A NZ244817A NZ24481792A NZ24481792A NZ244817A NZ 244817 A NZ244817 A NZ 244817A NZ 24481792 A NZ24481792 A NZ 24481792A NZ 24481792 A NZ24481792 A NZ 24481792A NZ 244817 A NZ244817 A NZ 244817A
- Authority
- NZ
- New Zealand
- Prior art keywords
- dowel
- assembly
- outer sleeve
- defining outer
- socket defining
- Prior art date
Links
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- Joining Of Building Structures In Genera (AREA)
Description
2j\ 4 817i i : ' * "••T OFFICE
1 S F~D
NEW ZEALAND
PATKNTTS ACT, 1951
No.: 244817
Date: 20 October 1992
COMPLETE SPECIFICATION "An Assembly for Use as a Concrete Slab Dowelling Assembly"
We, LESA SYSTEMS LIMITED, a company duly incorporated under the laws of New Zealand of 12 Melrose Street, Newmarket, Auckland, New Zealand hereby declare the invention for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:-
■£h 40 1Z
« »
This invention relates to an assembly for use as a concrete slab dowelling assembly as well as a method for dowelling concrete slabs.
Dowels used in the design of concrete floor slabs are well known. They provide support at the edge of the slabs and transfer wheel loads from one slab to the other and prevent the off setting of adjacent slab surfaces. The dowels used must be free to slide in and out of the slab to allow the joint to open or close as the slabs expand and contract. If the dowels are not properly aligned, i.e. perpendicular to the joint the dowels have to bend as the joint opens. This can place enormous stress on the slab itself and cause cracking. Also, if the slabs move relatively along their joint face dowels could cause cracking to occur. One solution to this problem that is known is to attach compressible material on one or both vertical sides of square dowels. This means that if the dowels are mis-aligned or the slabs move longitudinally relative to each other the material on the sides simply compresses as the joint expands and contracts or moves relatively and bending is eliminated. Also used is a plastic clip with foam attached to the inside vertical faces which is placed or slipped over the bar.
This clip has the disadvantage of requiring correct compressible material to be selected and attached to the inside surfaces of the clip. Also as the clip is open there is the difficulty of excluding concrete from the compressible material during a slab pour.
It is an object of the invention to provide a method of dowelling concrete slabs and apparatus therefor which will, at the very least, provide the public with a useful choice.
244*17
Accordingly in a first aspect the present invention consists in an assembly for use in dowelling together concrete slabs, said assembly comprising:
a dowel;
an extrusion enclosing at least that length of dowel which is to be over poured with concrete of a said slab, said extrusion having a substantially closed cross-section but having longitudinally extending means therewithin which locates said dowel inwardly of opposed peripheral portions of the extrusion to enable at least a degree of freedom of movement of the dowel relative to but within said opposed peripheral portions under loadings, said longitudinally extending means being capable of being sheared, crumpled or otherwise overridden under loadings created by movement between slabs in use; and a cap or other means closing that end or those ends of the extrusion beyond the dowel confined therein to prevent the ingress of concrete into the extrusion during a slab pour.
Preferably said extrusion extends beyond each end of said dowel.
Preferably said extrusion is substantially of a rectangular cross-section.
Preferably said longitudinally extending means locating said dowel within said extrusion are substantially as hereinafter described with reference to the accompanying dravirrv.
Preferably frangible or able to be sheared projections provide said longitudinally extending means locating said dowel.
Preferably there are four said projections.
24*4# 17
Preferably said extrusion includes a longitudinally extending member which locates said dowel and is able to be crumpled upon movement of the dowel relative to said extrusion in the aforementioned degree of freedom.
Preferably said cap is of a plastics material.
Preferably adhesive tape is said other means and encloses an end of the extrusion.
Preferably said extrusion is a plastics material.
In another aspect the present invention consists in a unitary slab structure having a frangible weakening along a line across which an assembly of any of the preceding paragraphs extends such that under frangible loading different parts of the slab can move under the limits of movement provided by the dowel included in said assembly.
In yet another aspect the present invention consists in two separated slab structures having extending there between an assembly as claimed in any one of Claims 1-10 such that under frangible loadings the slabs can move under the limits of movement provided by the dowel included in said assembly.
In yet another aspect the present invention consists in an assembly comprising:
a dowel;
a socket defining outer sleeve fully encasing said dowel, said socket defining outer sleeve providing longitudinally extending positioning means which at least under loadings over a threshold loading provide some freedom of movement transversely of said dowel within the sleeve while substantially not restricting longitudinal movement of said dowel;
sealing means substantially closing or sealing the ends of said socket defining outer sleeve. O / / O 4
I
Preferably said dowel is substantially square in cross-section.
Preferably said socket defining cuter sleeve is rectangular in cross-section.
Preferably said freedom of movement is oriented so that said socket defining outer sleeve provides for more movement in directions parallel to the said socket defining outer sleeve's wider transverse axis than said socket defining outer sleeve's substantially narrower transverse axis.
Preferably said freedom of movement is provided by transverse clearance between the said dowel and the internal sur&ce of said socket defining outer sleeve.
Preferably said positioning means consist of projections from the internal walls of said socket defining outer sleeve.
Preferably said projections are located on the two substantially wider internal surfaces of said socket defining outer sleeve.
Preferably said socket defining outer sleeve is manufactured of a rigid plastic material.
Preferably said dowel is manufactured of steel.
Preferably said sealing means consists of a plastics or aluminium cap which is attached to the ends of said socket defining outer sleeve.
Preferably adhesive tape is said sealing means and encloses an end of said socket defining outer sleeve.
Preferably said sleeve or extrusion is rectanguloid and is of dimension of about 500mm long, about 32mm wide and about 20mm deep.
In yet another aspect the present invention consists in a method of dowelling concrete slabs comprising:
providing fully sealed dowelling assemblies comprising a dowel, a socket defining outer sleeve encasing said dowel, said socket defining outer sleeve providing at least under loadings over a threshold loading, some transverse freedom of movement of said dowel within said sleeve by means of longitudinally extending means there within which locates said dowel, ends of said socket defining outer sleeve being sealed by sealing means;
pouring of concrete mix so as to encase the said sealed dowelling assemblies in a concrete slab;
providing (before or after said pouring) a region of weakness, frangibility or friability in said concrete slab at or towards the longitudinal centre of said concrete slab encased fully sealed dowelling assemblies.
Preferably said method is performed using an assembly as claimed in any one of the preceding claims.
In yet another aspect the present invention consists in a method of dowelling concrete slabs together as one or both of said slabs is being either poured or being grouted together when performed by a method comprising providing fully sealed dowelling assemblies comprising a dowel, a socket defining outer sleeve encasing said dowel, said socket defining outer sleeve providing at least under loadings over a threshold loading, some transverse freedom of movement of said dowel within said sleeve by means of longitudinally extending means there
within which locates said dowel, ends of said socket defining outer sleeve being sealed by sealing means;
pouring of concrete mix so as to encase the said sealed dowelling assemblies in a concrete slab;
providing (before or after said pouring) a region of weakness, frangibility or friability in said concrete slab at or towards the longitudinal centre of said concrete slab encased fully sealed dowelling assemblies.
Preferably said method is performed substantially as herein described with reference to the accompanying drawings.
In yet another aspect the present invention consists in a method of dowelling joints constructed between existing concrete slabs and new slabs comprising:
providing a rigid dowel, one end of which is encased in an existing concrete slab; providing a socket defining outer sleeve which allows by means of longitudinally extending means some freedom of transverse movement for said dowel when within the sleeve (at least over threshold loadings), said socket defining outer sleeve having at one end sealing means to seal said socket defining outer sleeve and placing said socket defining outer sleeve over the non-encased end of said rigid dowel until open end of said socket defining outer sleeve abuts said existing concrete slab;
providing a means of sealing said open end of said socket defining outer sleeve to said edge of said existing concrete slab (if required); and pouring a concrete slab adjacent to said slab so as to encase said socket defining outer sleeve.
24 4 y
24481
Preferably said method performed substantially as hereinbefore described using apparatus as described in preceding paragraphs and/or when performed substantially as hereinbefore described with reference to any of the accompanying drawings.
In yet another aspect the present invention consists in an assembly as described in the preceding paragraphs substantially as hereinbefore described with reference to any one of the accompanying drawings.
One preferred form of the present invention will now be described with reference to the accompanying drawings in which;
Figure 1 is a side elevation of the assembled, fully sleeved dowel apparatus;
Figure 2 is a plan view of the fully assembled, fully sleeved dowel apparatus;
Figure 3 is an end elevation of the fully assembled, fully sleeved dowel apparatus of Figure 1;
Figure 4 is a longitudinal sectional view of the fully assembled, fully sleeved dowel apparatus;
Figure 5 is a transverse sectional view of the fully assembled, fully sleeved dowel apparatus;
Figure 6 is a transverse sectional view of an alternative form of the fully assembled, fully sleeved dowel;
Figure 7 is a sectional view* of the fully assembled, fully sleeved dowelling apparatus in use; and
Figure 8 is a sectional view of the fally assembled, semi-sleeved dowel apparatus used to join concrete slabs.
With reference to Figures 1,2 and 3 the sleeved dowel apparatus socket defining outer sleeve 1 and end caps which fit over the ends of said socket defining outer sleeve 2 and 3, said socket defining outer sleeve and said end caps are preferably made out of a rigid stable plastic. As shown in Figures 5 and 6 the said socket defining outer sleeve encases a rigid dowel 4, said rigid dowel is preferably square in cross section and preferably manufactured from steel, said rigid dowel is substantially shorter in length than the socket defining outer sleeve and thus is free to expand and contract longitudinally.
The rigid dowel is held in position inside the said socket defining outer sleeve by means of plastic locating tips labelled 5, 6,7 and 8. These plastic locating tips are shown positioned on the two longer internal sides of the said socket defining outer sleeve, however, in other forms of the invention they may be positioned on only one wall or on the shorter side walls.
Alternatively, the dowel is held in position by flexible tips as shown in Figure 6. In one form these tips 20,21, 22 and 23, extend from the internal corners of the sleeves.
The substantially greater clearance provided between the shorter internal walls of said socket defining outer sleeve and the sides of said rigid dowel 9 and 10 compared to the clearance between the longer internal sides of said socket defining outer sleeve and the walls of said rigid dowel result in the assembly having greater compressibility parallel to the wider transverse axis of said socket defining outer sleeve as compared to the narrower axis of said socket defining outer sleeve.
2448 1 7
One use of the said folly sleeved dowel is shown in Figure 7 in which the folly sleeved dowel is encased in a concrete slab at or towards the longitudinal centre of said fully sleeved dowel is a region of weakness or friability.
This said region of weakness or friability induces the concrete slab to crack at or near this region. The folly sleeved dowel allows the crack to contract or widen but transmits loading stresses from one part of the said concrete slab across to the adjoining part.
A use of the partially sleeved dowel for connecting separate slabs of concrete is shown in Figure 8. One end of the dowel is not sleeved end 12 and is encased in the existing slab. The other end of the dowel 13 is encased in the socket defining outer sleeve 14. This socket defining outer sleeve is sealed at the end by the end cap 15.
The other end of this sleeve is sealed to the outer wall of the existing slab 16. The new concrete slab 17 is then poured over the sleeved end of the dowel 14. Thus a means of allowing expansion and contraction of a joint between an existing slab and a new slab of concrete is provided whereby loads are transmitted between the slabs.
In a preferred form of the present invention the assembly has the dimensions previously set forth, namely about 500mm long, about 32mm wide and about 20mm deep, and has the ends of the extrusion or sleeve preferably covered by adhesive taping rather than plastics or aluminium end caps. Such a construction may not be completed until just prior to use.
It thus can be seen that the invention provides a means of transmitting loading stresses across joints in concrete slabs without restricting the transverse expansion and/or contraction of said joints.
Claims (31)
1. An assembly for use in dowelling together concrete slabs, said assembly comprising: a dowel; an extrusion enclosing at least that length of dowel which is to be over poured with concrete of a said slab, said extrusion having a substantially closed cross-section but having longitudinally extending means therewithin which locates said dowel inwardly of opposed peripheral portions of the extrusion to enable at least a degree of freedom of movement of the dowel relative to but within said opposed peripheral portions under loadings, said longitudinally extending means being capable of being sheared, crumpled or otherwise overridden under loadings created by movement between slabs in use; and a cap or other means closing that end or those ends of the extrusion beyond the dowel confined therein to prevent the ingress of concrete into the extrusion during a slab pour.
2. An assembly of claim 1 wherein said extrusion extends beyond each end of said dowel.
3. An assembiy of claim 1 or claim 2 wherein said extrusion is substantially of a rectangular cross-section.
4. An assembly of any one of the preceding claims wherein said longitudinally extending means locating said dowel within said extrusion are substantially as hereinafter described with reference to the accompanying drawings. 244817 244817
5. An assembly of any one of claims 1 to 3 wherein frangible or able to be sheared projections provide said longitudinally extending means locating said dowel.
6. An assembly of claim 5 wherein there are four said projections.
7. An assembly of any one of claims 1 to 3 wherein said extrusion includes a longitudinally extending member which locates said dowel and is able to be crumpled upon movement of the dowel relative to said extrusion in the aforementioned degree of freedom.
8. An assembly of any one of claims 1 to 7 wherein said cap is of a plastics material.
9. An assembly of any one of claims 1 to 7 wherein adhesive tape is said other means and encloses an end of the extrusion.
10. An assembly of any one of claims 1 to 9 wherein said extrusion is a plastics material.
11. A unitary slab structure having a frangible weakening along a line across which an assembly of any one of Claims 1-10 extends such that under frangible loading different parts of the slab can move under the limits of movement provided by the dowel included in said assembly.
12. Two separated slab structures having extending there between an assembly as claimed in any one of Claims 1-10 such that under frangible loadings the slabs can move under the limits of movement provided by the dowel included in said assembly.
13. An assembly comprising: a dowel; 2448 17 a socket defining outer sleeve fully encasing said dowel, said socket defining outer sleeve providing longitudinally extending positioning means which at least under loadings over a threshold loading provide some freedom of movement transversely of said dowel within the sleeve while substantially not restricting longitudinal movement of said dowel; sealing means substantially closing or sealing the ends of said socket defining outer sleeve.
14. An assembly of claim 13 wherein said dowel is substantially square in cross-section.
15. An assembly of claim 13 or claim 14 wherein said socket defining outer sleeve is rectangular in cross-section.
16. An assembly of any one of claims 13 to 15 wherein said freedom of movement is oriented so that said socket defining outer sleeve provides for more movement in directions parallel to the said socket defining outer sleeve's wider transverse axis than said socket defining outer sleeve's substantially narrower transverse axis.
17. An assembly of any one of claims 13 to 16 wherein said freedom of movement is provided by transverse clearance between the said dowel and the internal surface of said socket defining outer sleeve.
18. An assembly as claimed in any one of claims 13 to 17 wherein said positioning means consist of projections from the internal walls of said socket defining outer sleeve.
19. An assembly of claim 18 wherein said projections are located on the two substantially wider internal surfaces of said socket defining outer sleeve. 244817
20. An assembly of any one of claims 13 to 19 wherein said socket defining outer sleeve is manufactured of a rigid plastic material.,
21. An assembly of any one of claims 13 to 20 wherein said dowel is manufactured of steel.
22. An assembly of any one of claims 13 to 21 wherein said sealing means consists of a plastics or aluminium cap which is attached to the ends of said socket defining outer sleeve.
23. An assembly of any one of claims 13 to 21 wherein adhesive tape is said sealing means and encloses an end of said socket defining outer sleeve.
24. An assembly of any one of the preceding claims wherein said sleeve or extrusion is rectanguloid and is of dimension of about SOOmm long, about 32mm wide and about 20mm deep.
25. A method of dowelling concrete slabs comprising: providing fully sealed dowelling assemblies comprising a dowel, a socket defining outer sleeve encasing said dowel, said socket defining outer sleeve providing at least under loadings over a threshold loading, some transverse freedom of movement of said dowel within said sleeve by means of longitudinally extending means there within which locates said dowel, ends of said socket defining outer sleeve being sealed by sealing means; pouring of concrete mix so as to encase the said sealed dowelling assemblies in a concrete slab; 244817 providing (before or after said pouring) a region of weakness, frangibility or friability in said concrete slab at or towards the longitudinal centre of said concrete slab encased fully sealed dowelling assemblies.
26. A method as claimed in claim 25 when performed using an assembly as claimed in any one of the preceding claims.
27. A method of dowelling concrete slabs together as one or both of said slabs is being either poured or being grouted together when performed by a method as claimed in claim 25.
28. A method as claimed in any one of claims 25 to 27 when performed substantially as hereinbefore described with reference to the accompanying drawings.
29. A method of dowelling joints constructed between existing concrete slabs and new slabs comprising: providing a rigid dowel, one end of which is encased in an existing concrete slab; providing a socket defining outer sleeve which allows by means of longitudinally extending means some freedom of transverse movement for said dowel when within the sleeve (at least over threshold loadings), said socket defining outer sleeve having at one end sealing means to seal said socket defining outer sleeve and placing said socket defining outer sleeve over the non-encased end of said rigid dowel until open end of said socket defining outer sleeve abuts said existing concrete slab; providing a means of sealing said open end of said socket defining outer sleeve to said edge of said existing concrete slab (if required); and pouring a concrete slab adjaccnt to said slab so as to encase said socket defining outer sleeve. 2448 1
30. A method as claimed in claim 29 when performed substantially as hereinbefore described using apparatus as claimed in any one of claims 1 to 24 and/or when performed substantially as hereinbefore described with reference to any of the accompanying drawings.
31. An assembly as claimed in any one of claims 1 to 24 substantially as hereinbefore described with reference to any one of the accompanying drawings. r *T OFFICE 1 8 SE? 1997 q:.. END OF CLAIMS -16-
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ333470A NZ333470A (en) | 1992-10-20 | 1992-10-20 | Dowel in sleeve with movement restricting means |
| NZ24481792A NZ244817A (en) | 1992-10-20 | 1992-10-20 | Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NZ24481792A NZ244817A (en) | 1992-10-20 | 1992-10-20 | Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ244817A true NZ244817A (en) | 1997-11-24 |
Family
ID=19924151
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ333470A NZ333470A (en) | 1992-10-20 | 1992-10-20 | Dowel in sleeve with movement restricting means |
| NZ24481792A NZ244817A (en) | 1992-10-20 | 1992-10-20 | Dowelling assembly for concrete slab has a dowel encased by a socket sleeve which provides transverse freedom of movement |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ333470A NZ333470A (en) | 1992-10-20 | 1992-10-20 | Dowel in sleeve with movement restricting means |
Country Status (1)
| Country | Link |
|---|---|
| NZ (2) | NZ333470A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020192853A1 (en) * | 2019-03-27 | 2020-10-01 | Component 2.0 A/S | Dowel pin for easy assembly and high accuracy |
-
1992
- 1992-10-20 NZ NZ333470A patent/NZ333470A/en unknown
- 1992-10-20 NZ NZ24481792A patent/NZ244817A/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020192853A1 (en) * | 2019-03-27 | 2020-10-01 | Component 2.0 A/S | Dowel pin for easy assembly and high accuracy |
| US11333186B2 (en) | 2019-03-27 | 2022-05-17 | Component 2.0 A/S | Dowel pin for easy assembly and high accuracy |
Also Published As
| Publication number | Publication date |
|---|---|
| NZ333470A (en) | 1999-03-29 |
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