AU2015101948A4 - Monolithic Slab - Google Patents
Monolithic Slab Download PDFInfo
- Publication number
- AU2015101948A4 AU2015101948A4 AU2015101948A AU2015101948A AU2015101948A4 AU 2015101948 A4 AU2015101948 A4 AU 2015101948A4 AU 2015101948 A AU2015101948 A AU 2015101948A AU 2015101948 A AU2015101948 A AU 2015101948A AU 2015101948 A4 AU2015101948 A4 AU 2015101948A4
- Authority
- AU
- Australia
- Prior art keywords
- slab
- footing
- monolithic
- mesh
- transition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 230000007704 transition Effects 0.000 claims description 19
- 230000002787 reinforcement Effects 0.000 claims description 15
- 238000010276 construction Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000009415 formwork Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 238000005336 cracking Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 239000011449 brick Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Foundations (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
Abstract The present invention provides a monolithic slab (11) comprising at least one footing (15), a first slab portion (21) extending between the footing and a second slab portion (23), the second slab portion being thinner than the footing, the first slab portion having a bottom surface (37) which tapers inwardly in a direction away from the at least one footing. is' 41
Description
Monolithic Slab
TECHNICAL FIELD [0001] The present invention generally relates to a foundation for a building. In particular the present invention relates to a foundation in the form of a monolithic slab.
BACKGROUND ART [0002] In the construction industry, buildings typically commence with the construction of a foundation upon which the structure of the building is constructed. Where the ground is of a suitable characteristic, the foundation is typically in the form of a concrete slab formed on top of the ground.
[0003] As the slab is generally not strong enough to provide support for any load bearing walls, such as the outer wall of a double brick building, it is necessary to provide support footings. The footings are formed prior to the slab being poured. As the footings are greater in thickness than the slab, a trench must first be dug, before the concrete can be poured. The footings also incorporate reinforcement in the form of steel bars extending along the footing to provide further strength to the footings and to minimise any cracking.
[0004] Once the footings have been poured and set, the slab can be poured.
[0005] Prior to pouring the concrete for the slab, the ground is prepared. This preparation typically includes compacting the ground and laying a moisture barrier over the footprint of the slab. The process may also include the laying of a stone base.
[0006] Once the ground has been prepared, form work is assembled to define the boundaries of the slab, as well as to accommodate any required change in level.
[0007] The process of first pouring the footings and then pouring the slab extends the process by several days, delaying the next stage of construction. It also requires the concrete workers to return to the site after the footings have been poured in order to lay the slab, adding to the cost of the building.
2015101948 23 Oct 2015 [0008] A variation to this form of construction is to pour the footings and slab at the same time, creating what is known as a monolithic slab.
[0009] Monolithic slabs are poured in a similar manner to that note above. However, the monolithic slab have a thicker region where load bearing components of the future building will be positioned. These areas also have reinforcement in the form of reinforcement bars located along the thicker region.
[0010] A disadvantage of current monolithic slabs is that they are prone to cracking, compromising the strength of the slab and therefore the stability of the building formed on top of the monolithic slab.
[0011] [0012] The preceding discussion of the background art is intended to facilitate an understanding of the present invention only. The discussion is not an acknowledgement or admission that any of the material referred to is or was part of the common general knowledge as at the priority date of the application.
SUMMARY OF INVENTION [0013] It is an object of this invention to provide a monolithic slab which ameliorates, mitigates or overcomes, at least one disadvantage of the prior art, or which will at least provide the public with a practical choice.
[0014] The present invention provides a monolithic slab for use in the construction of a structure such as a house, the monolithic slab comprises:
a footing providing at least an edge portion of the monolithic slab;
a slab comprising a first slab portion and a second slab portion, the second slab portion being thinner than the footing, the first slab portion extending between the footing and the second slab portion;
wherein the first slab portion tapers gently inwardly from the footing to the second slab portion.
2015101948 23 Oct 2015 [0015] The present invention further provides a monolithic slab comprising at least one footing, a first slab portion extending between the footing and a second slab portion, the second slab portion being thinner than the footing, the first slab portion having a bottom surface which tapers inwardly in a direction away from the at least one footing.
[0016] The present invention further provides a monolithic slab for use in the construction of a structure such as a house, the monolithic slab comprises:
a footing providing thickened portion of the monolithic slab;
a slab comprising a first slab portion and a second slab portion, the second slab portion being thinner than the footing, the first slab portion extending between the footing and the second slab portion;
wherein the first slab portion tapers gently inwardly from the footing to the second slab portion.
[0017] The first slab portion may have an upper surface which is level with an upper surface of the second slab portion, together providing an upper surface of the slab, and a lower sloped surface whereby the first slab portion tapers inwardly away from the footing.
[0018] The lower sloped surface may be sloped at a gradient of at least 1 to 2. The lower sloped surface may be sloped at a gradient of 1 to 6.
[0019] The monolithic slab may also comprise reinforcement embedded therein. The reinforcement may approximate the contour of the slab. The reinforcement may extend into the footing.
[0020] The reinforcement may be in the form of a mesh sheet typically formed from steel. The mesh may have a first mesh portion and a second mesh portion, wherein the second mesh portion may lie in an approximate parallel relationship to the upper surface of the slab. The first mesh portion may be angled relative to the second mesh portion such that the first mesh portion extends below the upper surface of the slab towards the footing.
2015101948 23 Oct 2015 [0021] The first mesh portion may be angled relative to the second mesh portion at a ratio of at least 1 to 6.
[0022] In one aspect of the invention the transition of the mesh between the first mesh portion and the second mesh portion occurs further from the footing than the transition of the slab from the first slab portion to the second slab portion.
[0023] Preferably the first mesh portion is closer to a junction of the lower surface of the first slab portion and a lower surface of the second slab portion than it is to the upper surface of the slab.
[0024] Preferably the overall extent of the first mesh portion is closer to the lower surface of the monolithic slab than it is to the upper surface of the monolithic slab.
[0025] As the monolithic slab cures, it shrinks and contracts. As this occurs the ground underneath the slab provides resistance to the shrinking slab, creating tension in the slab adjacent the ground. This tension is greatest at the junction. Reinforcement mesh in in close proximity to the junction provides this region of the slab with additional strength and is therefore more resistance to cracking.
[0026] In another aspect of the invention the transition of the mesh between the first mesh portion and the second mesh portion occurs closer to the footing than the transition of the slab from the first slab portion to the second slab portion.
[0027] In another aspect of the invention the transition of the mesh from the first mesh portion to the second mesh portion is the same distance from the footing as the transition of the slab from the first slab portion to the second slab portion.
[0028].
[0029] The footing may have a first footing portion and a second footing portion.
[0030] A first end of the mesh may extend into the first footing portion [0031] The second footing portion may extend between the first footing portion and the first slab portion. An upper surface of the first footing portion may be lower than an upper surface of the second footing portion.
2015101948 23 Oct 2015 [0032] In one aspect of the invention a vertical wall extends between the upper surface of the first footing portion and the upper surface of the second footing portion.
[0033] In another aspect of the invention a sloped wall extends between the upper surface of the first footing portion and the upper surface of the second footing portion.
[0034] The upper surface of the second footing portion may be level with the upper surface of the first slab portion.
[0035] A moisture barrier may be provided between the ground and the monolithic siab.
[0036] Preferably when the footing is located in an internal region of the slab the first slab portion and second slab portion extend from both sides of the footing. In this arrangement both sides also incorporate reinforcement, as hereinbefore described.
[0037] The present invention further provides a method of forming a monolithic slab as hereinbefore described.
[0038] The present invention further provides a method of forming a monolithic slab, the monolithic slab comprising at least one footing, a first slab portion extending between the footing and a second slab portion, the second slab portion being thinner than the footing, the method comprises the steps of preparing the ground including forming trenches;
placing a waterproof membrane thereover:
laying formwork to establish the slab footprint;
placing reinforcement thereon;
pouring a settable material, such as concrete.
[0039] The present invention negates the need to separately pour footings which would otherwise be required in conventional construction methods.
2015101948 23 Oct 2015
BRIEF DESCRIPTION OF THE DRAWINGS [0040] Further features of the present invention are more fully described in the following description of several non-limiting embodiments thereof. This description is included solely for the purposes of exemplifying the present invention. It should not be understood as a restriction on the broad summary, disclosure or description of the invention as set out above. The description will be made with reference to the accompanying drawings in which:
Figure 1 is a cross sectional view of a monolithic slab according to a first embodiment of the invention
Figure 2 is a cross sectional view of a monolithic slab according to a second embodiment of the invention; and
Figure 3 is a cross sectional view of a monolithic slab according to a third embodiment of the invention.
[0041] In the drawings like structures are referred to by like numerals throughout the several views. The drawings shown are not necessarily to scale, with emphasis instead generally being placed upon illustrating the principles of the present invention.
DESCRIPTION OF EMBODIMENTS [0042] Referring to figure 1, the invention according to the first embodiment is in the form of a monolithic slab 11 for use in the construction of a structure such as a building (not shown). In the present embodiments the monolithic slab 11 is used to support a double brick cavity structure, such as a residential house. However, the present invention is not limited to such a structure and can also be applied in the construction of other structures.
[0043] The monolithic slab 11 comprises a slab 13 and a footing 15. As shown in figure 1, the footing 15 extends along the edge of the monolithic slab 11 and supports the double brick cavity structure depicted as an outer wall 17 and an inner wall 19. Typically the footing 15 would extend along at least the perimeter of the slab 11.
2015101948 23 Oct 2015 [0044] The slab 13 comprises a first slab portion 21 and a second slab portion 23. In the present embodiment the first slab portion 21 and the second slab portion 23 cooperate to provide an upper surface 25 of the slab 13.
[0045] The footing 15 comprises a first footing portion 27 and a second footing portion 29. In the present embodiment the first footing portion 21 has an upper surface 31 which is lower than the upper surface 25 of the slab 13 and is adapted to support the outer wall 17. The second footing portion 21 has an upper surface 33 which is level with the upper surface 25 of the slab 13 and is adapted to support the inner wall 19.
[0046] In the first embodiment shown in figure 1 a substantially vertical wall 34 extends between the upper surface 31 of the first footing portion 21 and the upper surface 33 of the second footing portion 21. Ina second embodiment as shown in figure 2 a slope wall 134 extends between the upper surface 31 of the first footing portion 21 and the upper surface 33 of the second footing portion 21.
[0047] The first slab portion 21 extends between the footing 15 and the second slab portion 23. The first slab portion 21 is defined by a lower surface 39 of the footing 15, an upper surface 35, which forms part of the upper surface 25 of the slab 13, and a lower surface 37 which extends between the lower surface 39 of the footing 15, and a lower surface 41 of the second slab portion 23. The lower surface 37 of the first slab portion 21 therefore slopes upwardly between the footing 15 and the second slab portion 23.
[0048] According to the first embodiment the slope of the lower surface 37 is at a gradient of 1 to 2, while in the second embodiment (figure 2) and third embodiment (figure 3) the slope of the lower surface 137 of the first slab portion 21 is at a gradient of 1 to 6. This ratio provides a sufficiently gentle transition between the footing 15 and the second slab portion 23, allowing for shrinkage of the slab as it dries. This construction of a slab minimises edge restraint and therefore reduces cracking which would otherwise occur when the transition between the footing and the slab is abrupt.
[0049] The monolithic slab 11 also comprises reinforcement in the form of a steel mesh 45 which is embedded within the monolithic slab 11. The mesh 45 comprises a first mesh portion 47 which extends from a second mesh portion 49 wherein the first mesh portion 47 is angularly positioned relative to the second mesh portion 49. In the present
2015101948 23 Oct 2015 embodiments the first mesh portion 47 is angularly spaced so as to be sloped relative to the second mesh portion 49 at a ratio of 1 to 6.
[0050] The first mesh portion 47 is embedded in the slab 13 such that it extends along the first slab portion 21, extending downwardly away from the upper surface 25 of the slab 13. The first mesh portion 47 also extends into the footing 15, terminating within the first footing portion 27.
[0051] The second mesh portion 49 is embedded in the slab 13 such that it lies approximately parallel to the upper surface 25 of the slab.
[0052] When the mesh 45 is in position the transition of the mesh 45 between the first mesh portion 47 and the second mesh portion 49 occurs further from the footing 15 than the transition of the slab 13 between the first slab portion 21 and the second slab portion 23. With this configuration the first mesh portion 47 is closer to a junction 40, than it is to the upper surface 25 of the slab. The junction 40 is defined by the intersection of the lower surface 37 of the first slab portion 21 and a lower surface 41 of the second slab portion 23.
[0053] In a second embodiment, as shown in figure 2, the second mesh portion 49 extends a distance into the first slab portion 21 such that the transition of the mesh 45 between the first mesh portion 47 and the second mesh portion 49 occurs within the first slab portion 21. In a third embodiment, as shown in figure 3, the transition of the mesh 45 between the first mesh portion 47 and the second mesh portion 49 occurs in approximate alignment with the junction 40.
[0054] While only shown in the third embodiment, see figure 3, the monolithic slab 11 is positioned on a moisture barrier 135.
[0055] While the above embodiments show the footing 15 as extending to the edge of the monolithic slab 11, there may be regions of the monolithic slab 11 inwardly from the edge which are required to be thicker than the slab. In these regions the same principles as described above may also be applied. In such regions it may be the case that a footing positioned internally from the edge may have a first slab portion located either side of the footing. Such variations are considered to be within the scope of this invention.
2015101948 23 Oct 2015 [0056] A critical consideration in the application of the present invention is the transition/slope of the first portion of the slab.
[0057] Modifications and variations such as would be apparent to the skilled addressee are considered to fall within the scope of the present invention. The present invention is not to be limited in scope by any of the specific embodiments described herein. These embodiments are intended for the purpose of exemplification only. Functionally equivalent products, formulations and methods are clearly within the scope of the invention as described herein.
[0058] Reference to positional descriptions, such as lower and upper, are to be taken in context of the embodiments depicted in the figures, and are not to be taken as limiting the invention to the literal interpretation of the term but rather as would be understood by the skilled addressee.
[0059] Throughout this specification, unless the context requires otherwise, the word comprise or variations such as comprises or comprising, will be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers.
[0060] Also, future patent applications maybe filed in Australia or overseas on the basis of, or claiming priority from, the present application. It is to be understood that the following provisional claims are provided by way of example only, and are not intended to limit the scope of what may be claimed in any such future application. Features may be added to or omitted from the provisional claims at a later date so as to further define or re-define the invention or inventions.
Claims (24)
1. A monolithic slab for use in the construction of a structure such as a house, the monolithic slab comprises:
a footing providing at least an edge portion of the monolithic slab;
a slab comprising a first slab portion and a second slab portion, the second slab portion being thinner than the footing, the first slab portion extending between the footing and the second slab portion;
wherein the first slab portion tapers inwardly from the footing to the second slab portion.
2. A monolithic slab comprising at least one footing, a first slab portion extending between the footing and a second slab portion, the second slab portion being thinner than the footing, the first slab portion having a bottom surface which tapers inwardly in a direction away from the at least one footing.
3. A monolithic slab for use in the construction of a structure such as a house, the monolithic slab comprises:
a footing providing thickened portion of the monolithic slab;
a slab comprising a first slab portion and a second slab portion, the second slab portion being thinner than the footing, the first slab portion extending between the footing and the second slab portion;
wherein the first slab portion tapers inwardly from the footing to the second slab portion.
4. The monolithic slab according to any one of the preceding claims wherein the first slab portion has an upper surface which is level with an upper surface of the second slab portion, to provide an upper surface of the slab, and a lower surface so that the first slab portion tapers inwardly away from the footing.
2015101948 23 Oct 2015
5. The monolithic slab according to any one of the preceding claims wherein the lower sloped surface is at a gradient of at least 1 to 2.
6. The monolithic slab according to any one of the claims 1 to 4 wherein the lower sloped surface is at a gradient of 1 to 6.
7. The monolithic slab according to any one of the preceding claims wherein the monolithic slab comprises reinforcement embedded therein and extending into the footing, the reinforcement approximating the contour of the slab.
8. The monolithic slab according to claim 7 wherein reinforcement is in the form of a mesh sheet having a first mesh portion and a second mesh portion, wherein the second mesh portion lies in an approximate parallel relationship to the upper surface of the slab.
9. The monolithic slab according to claim 8 wherein the first mesh portion is angled relative to the second mesh portion such that the first mesh portion extends below the upper surface of the slab towards the footing.
10. The monolithic slab according to claim 9 wherein the first mesh portion is angled relative to the second mesh portion at a ratio of at least 1 to 6.
11. The monoHthsc slab according to claim 9 or 10 wherein the transition of the mesh between the first mesh portion and the second mesh portion occurs further from the footing than the transition of the slab from the first slab portion to the second slab portion.
12. The monolithic slab according to claim 9, 10 or 11 wherein the first mesh portion is closer to a junction of the lower surface of the first slab portion and a lower surface of the second slab portion than it is to the upper surface of the slab.
13. The monolithic slab according to claim 9, 10, 11 or 12 wherein the overall extent of the first mesh portion is closer to the lower surface of the monolithic slab than it is to the upper surface of the monolithic slab.
2015101948 23 Oct 2015
14. The monolithic slab according to claim 9 or 10 wherein the transition of the mesh between the first mesh portion and the second mesh portion occurs closer to the footing than the transition of the slab from the first slab portion to the second slab portion.
15. The monolithic slab according to claim 9 or 10 wherein the transition of the mesh from the first mesh portion to the second mesh portion is the same distance from the footing as the transition of the slab from the first slab portion to the second slab portion.
16. The monolithic slab according to any one of the preceding claims wherein the footing has a first footing portion and a second footing portion, the second footing portion extends between the first footing portion and the first slab portion. .
17. The monolithic slab according to claim 16 wherein a first end of the mesh extends into the first footing portion
18. The monolithic slab according to claim 16 or 17 wherein an upper surface of the first footing portion is lower than an upper surface of the second footing portion.
19. The monolithic slab according to claim 18 wherein a vertical wall extends between the upper surface of the first footing portion and the upper surface of the second footing portion.
20. The monolithic slab according to claim 18 wherein a sloped wall extends between the upper surface of the first footing portion and the upper surface of the second footing portion.
21. The monolithic slab according to claim 18. 19 or 20 wherein the upper surface of the second footing portion is level with the upper surface of the first slab portion.
22. The monolithic slab according to any one of the preceding claims having the footing is located in an internal region of the slab, whereby the first slab portion and second slab portion extend from both sides of the footing in a mirror image.
23. A method of forming a monolithic slab, the monolithic slab being as described in any one of the preceding claims.
2015101948 23 Oct 2015
24. A method of forming a monolithic slab, the monolithic slab comprising at least one footing, a first slab portion extending between the footing and a second slab portion, the second slab portion being thinner than the footing, the method comprises the steps of preparing the ground including forming trenches;
placing a waterproof membrane thereover;
laying formwork to establish the slab footprint;
placing reinforcement thereon;
pouring a settable material, such as concrete.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2014904248A AU2014904248A0 (en) | 2014-10-23 | Monolithic Slab | |
| AU2014904248 | 2014-10-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2015101948A4 true AU2015101948A4 (en) | 2019-05-16 |
Family
ID=55920711
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2015101948A Expired AU2015101948A4 (en) | 2014-10-23 | 2015-10-23 | Monolithic Slab |
| AU2015246178A Pending AU2015246178A1 (en) | 2014-10-23 | 2015-10-23 | Monolithic Slab |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2015246178A Pending AU2015246178A1 (en) | 2014-10-23 | 2015-10-23 | Monolithic Slab |
Country Status (1)
| Country | Link |
|---|---|
| AU (2) | AU2015101948A4 (en) |
-
2015
- 2015-10-23 AU AU2015101948A patent/AU2015101948A4/en not_active Expired
- 2015-10-23 AU AU2015246178A patent/AU2015246178A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| AU2015246178A1 (en) | 2016-05-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |