NZ743481B - Threshold Drain System and Method - Google Patents
Threshold Drain System and MethodInfo
- Publication number
- NZ743481B NZ743481B NZ743481A NZ74348117A NZ743481B NZ 743481 B NZ743481 B NZ 743481B NZ 743481 A NZ743481 A NZ 743481A NZ 74348117 A NZ74348117 A NZ 74348117A NZ 743481 B NZ743481 B NZ 743481B
- Authority
- NZ
- New Zealand
- Prior art keywords
- drain
- gutter
- building
- exterior
- rims
- Prior art date
Links
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000005755 formation reaction Methods 0.000 claims description 5
- 238000010276 construction Methods 0.000 abstract description 4
- 239000011521 glass Substances 0.000 description 4
- FDPIMWZHGJNESB-VCSXYVMHSA-N (2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S,3S)-2-[[(2S)-1-[(2S)-2-[[(2S)-2-[[(2S)-6-amino-2-[[(2S)-2-[[(2S)-2-[[(2R)-2-[[(2S)-2-amino-3-methylbutanoyl]amino]-3-sulfanylpropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]-3-carboxypropanoyl]amino]hexanoyl]ami Chemical compound C([C@@H](C(=O)N1CCC[C@H]1C(=O)N[C@@H]([C@@H](C)CC)C(=O)N[C@@H](CO)C(=O)N[C@@H](CC=1NC=NC=1)C(=O)N[C@@H](C(C)C)C(=O)N[C@@H](CCCN=C(N)N)C(O)=O)NC(=O)[C@H](CO)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CC(O)=O)NC(=O)[C@H](CC=1C=CC(O)=CC=1)NC(=O)[C@H](CS)NC(=O)[C@@H](N)C(C)C)C1=CC=CC=C1 FDPIMWZHGJNESB-VCSXYVMHSA-N 0.000 description 3
- 241000209134 Arundinaria Species 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000009415 formwork Methods 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000000149 penetrating Effects 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Abstract
method of forming a threshold drain 31 is disclosed. The drain 31 extends alongside an exterior wall 4 of a building and is formed in an exterior surface 36. The building has an interior ?oor 21 with the exterior surface 36 and the interior ?oor 21 being substantially ?ush to permit traymobile, wheelchair and invalid access. In a single concrete pour, the drain gutter 31, exterior surface 36, interior ?oor 21 and a gutter 40 are all formed. The gutter has an exterior side wall 39 which supports a plurality of triangular cantilever arms 43. A support frame 42 having 2 longitudinally extending rims 51,52 is supported by the arms 43 and releasably receives a grate 32 between the rims 51, 52. The inner rim 51 is spaced from the wall 24 of the building, preferably by 10-12 mm, so as to provide a barrier to moisture in accordance with the Building Code of New Zealand standard set out in Clause E2 External Moisture. The drain 31 is also disclosed. Hitherto the construction of the threshold drain has required two concrete pours. The ?rst pour forms the drain trench or gutter. Thereatter the support frame for the grate of the drain is installed on the poured concrete. Next a second concrete pour takes place so as to cover the supporting arms of the support frame and build up the exterior concrete surface to the level of the interior ?oor (less any provision for subsequent pavers to be laid on the exterior concrete surface). The present invention overcomes the need for two concrete pours which must, of necessity, take place on di?erent dates to enable the ?rst pour to set.
Description
D-NZ-D1
Threshold Drain System and Method
Field of the Invention
The present invention relates to drains and, in particular, to threshold drains.
Background Art
Threshold drains are used on balconies, and general outdoor areas such as patios and
entertainment areas. Threshold drains enable the formed areas outside a building to be
made substantially level with the floor levels inside the building. Such an equality of
levels ensures safe passage of wheelchairs, traymobiles and other wheeled
implements, and invalids and other persons who require the assistance of a walking
cane.
A threshold drain also dramatically reduces the risk of surface water penetrating a
building via a door threshold, and also collects run-off from doors and windows
during storms. The Building Code of New Zealand provides a standard set out in
Clause E2 External Moisture which requires that a gap extend between the building
wall and the grate of the adjacent threshold drain.
Hitherto the construction of the threshold drain has required two concrete pours. The
first pour forms the drain trench or gutter. Thereafter the support frame for the grate
of the drain is installed on the poured concrete. Next a second concrete pour takes
place so as to cover the supporting arms of the support frame and build up the exterior
concrete surface to the level of the interior floor (less any provision for subsequent
pavers to be laid on the exterior concrete surface).
Genesis of the Invention
The genesis of the present invention is a desire to simplify the construction of
threshold drains by the provision of a threshold drain system which requires only a
single concrete pour and thus saves both time and money in the threshold drain
construction.
5612D-NZ-D1
Summary of the Invention
In accordance with a first aspect of the present invention there is disclosed a drain
system for a threshold drain extending alongside an exterior wall of the building, said
building having an interior floor and said threshold drain draining an exterior formed
surface which is substantially flush with said interior floor, said system comprising:
a drain gutter having a base and two side walls, one of said sidewalls being
substantially aligned with said building wall and the other of said sidewalls being
spaced from said building wall;
a grate support frame having a pair of elongate rims, said frame being supported by a
plurality of cantilever arms each of which is secured to the other side wall of said
gutter following formation of said gutter, said frame having a width between said rims
which is less than the width of said gutter; and
a grate located between said rims and supported by said frame;
whereby a gap is created between said building wall and the rim closer to said
building wall, said gap extending alongside said building wall.
In accordance with a second aspect of the present invention there is disclosed a
method of forming a threshold drain extending alongside an exterior wall of the
building, said building having an interior floor and said threshold drain being formed
in an exterior formed surface which is substantially flush with said interior floor, said
method comprising the steps of:
in a single concrete pour, forming a drain gutter and said exterior formed surface, said
drain gutter having a base and two side walls, one of said sidewalls being substantially
aligned with said building and the other of said sidewalls being spaced from said
building wall,
supporting a grate support frame having a pair of elongate rims by a plurality of
cantilever arms, each of said cantilever arms being secured to the other side wall of
said gutter after formation thereof, said frame having a width between said rims which
is less than the width of said gutter, and
supporting a grate on said frame and located between said rims,
whereby a gap is created between said building wall and the rim closer to said
building wall, said gap extending alongside said building wall.
5612D-NZ-D1
Brief Description of the Drawings
A preferred embodiment of the invention will now be described, by way of example
only, with reference to the accompanying drawings in which:
Fig. 1 is a perspective view of a prior art threshold drain,
Fig. 2 is a transverse cross-sectional view through the drain of Fig. 1,
Fig. 3 is a perspective view of a threshold drain in accordance with a preferred
embodiment of the present invention,
Fig. 4 is a transverse cross-sectional view through the drain of Fig. 3 prior to
installation of the threshold drain, and
Fig. 5 is a transverse cross-sectional view through the drain of Fig. 3 after
installation of the threshold drain.
Detailed Description
As seen in Figs. 1 and 2, a prior art threshold drain 1 having a grate 2 is formed
adjacent a wall 4 of a building. Part of the wall 4 and the lower portion 5 of a balcony
or other exterior formed surface 6 are formed by a first concrete pour. The first
concrete pour also forms the base 7, interior side wall 8, and part of the exterior side
wall 9 of the gutter 10 of the threshold drain 1.
A vertical frame 12 has a number of horizontal supporting arms 13 which, as
illustrated, are bolted to the lower portion 5. A formwork strip 15 is secured to the
underside of the supporting arms 13. Thus the vertical frame 12 and formwork strip
provide a means of containment for the concrete 16 of a second concrete pour
which provides the upper portion 18 of the exterior formed surface 6 and the
remainder of the exterior side wall 9.
In one arrangement the exterior formed surface 6 is provided by pavers 20 installed on
a thin layer of sand, in which case the concrete 16 has an upper surface which is
below the grate 2 by approximately the height of the pavers 20. Alternatively, if the
concrete formed by lower portion 5 and upper portion 18 is intended to finish the
exterior formed surface 6, then the concrete 16 is levelled off, or screeded, flush with
the grate 2 and thus substantially flush with the interior floor 21.
5612D-NZ-D1
In the particular arrangement illustrated, part of the wall 4 is provided by means of a
sliding glass door 24 which opens onto the exterior formed surface 6. As a
consequence, the sliding glass door 24 can be opened and ingress and egress between
the interior of the building 4 and the exterior formed surface 6 can be achieved for
tray mobiles, wheelchairs, invalids with walking canes, and the like because both the
interior and exterior surfaces are substantially flush. In addition, there is a gap 26
which extends between the wall 4 and the grate 2 and this provides a barrier to
moisture in accordance with the above-mentioned Building Code of New Zealand
standard set out in Clause E2 External Moisture.
Accordingly, the prior art arrangement described above complies with the standard
but requires two concrete pours which must, of necessity, take place on different days.
Accordingly the procedure required to build the prior art arrangement described above
is time-consuming and thus expensive.
In accordance with a preferred embodiment of the present invention, as illustrated in
Figs. 3 - 5, a threshold drain 31 which also complies with the above-mentioned
standard is provided. As seen in Figs. 3 - 5, the threshold drain 31 has a grate 32 and,
as before, is formed adjacent the wall 4 of a building. Part of the wall 4 and all of the
balcony or other exterior formed surface 36 are formed by a single concrete pour. The
concrete 46 of the single concrete pour also forms the base 37, interior side wall 38,
and all of the exterior side wall 39 of the gutter 40 of the threshold drain 31.
Preferably the gutter 40 is approximately 200 mm wide.
A support frame 42 has a plurality of triangular cantilevered arms 43 which, as
illustrated, are bolted to the exterior side wall 39 of the gutter 40 after the single
concrete pour has taken its initial set. It will be seen that the triangular arms 43 have a
first vertical edge which is secured to the sidewall 39, a second horizontal edge which
supports the grate 32, and a hypotenuse 44 which does not obstruct the gutter 40. The
support frame 42 also has two rims 51, 52 between which the grate 32 is retained.
Either the exterior formed surface 36 is provided by pavers 20 installed on a thin layer
of sand, in which case the concrete 46 of the single concrete pour has an upper surface
5612D-NZ-D1
which is below that of the grate 32 by approximately the height of the pavers 20. Or,
alternatively, if the concrete 46 is intended to finish the exterior formed surface 36,
then the concrete 46 is levelled off, or screeded, flush with the grate 32 and thus
substantially flush with the interior floor 21.
Again, part of the wall 4 is provided by means of a sliding glass door 24 which opens
onto the exterior formed surface 36. As a consequence, the sliding glass door 24 can
be opened and ingress and egress between the interior of the building and the exterior
formed surface 36 can be achieved for tray mobiles, wheelchairs, invalids with
walking canes, and the like, because both the interior and exterior surfaces are
substantially flush. In addition, as before there is a gap 26 (of at least 10mm and
preferably 12mm width) which extends between the wall 4 and the grate 32. This gap
26 provides a barrier to moisture in accordance with the above-mentioned Building
Code of New Zealand standard set out in Clause E2 External Moisture.
A particular advantage of the preferred embodiment illustrated in Figs. 3 - 5 is that
there is only a requirement for a single concrete pour and so the installation of the
threshold drain 31 is quick and easy. Furthermore, the arrangement lends itself to
retrofitting where a suitable existing gutter 10, 40 is provided. This is unable to be
easily achieved with the prior art system and method.
Preferably the grate 32 is able to be removed from the frame 42 since it is retained
therein by means of a resilient snap fit inter-engagement. A range of grates 32 having
a variety of materials and slot configurations is able to be provided.
The foregoing describes only one embodiment of the present invention and
modifications, obvious to those skilled in the drainage arts, can be made thereto
without departing from the scope of the present invention.
The term “comprising” (and its grammatical variations) as used herein is used in the
inclusive sense of “including” or “having” and not in the exclusive sense of
“consisting only of”.
5612D-NZ-D1
Claims (14)
1. A drain system for a threshold drain extending alongside an exterior wall of the building, said building having an interior floor and said threshold drain draining an exterior formed surface which is substantially flush with said interior floor, said system comprising: a drain gutter having a base and two side walls, one of said sidewalls being substantially aligned with said building wall and the other of said sidewalls being spaced from said building wall; a grate support frame having a pair of elongate rims, said frame being supported by a plurality of cantilever arms each of which is secured to the other side wall of said gutter following formation of said gutter, said frame having a width between said rims which is less than the width of said gutter; a grate located between said rims and supported by said frame; whereby a gap is created between said building wall and the rim closer to said building wall, said gap extending alongside said building wall.
2. The system as defined in claim 1 wherein each of said cantilever arms is substantially a right triangle having a first substantially vertical edge secured to said other side wall, having a second substantially horizontal edge supporting said rims, and a third edge forming an hypotenuse.
3. The system as defined in claim 1 or 2 wherein said grate is releasably located between said rims.
4. The system as defined in any one of claims 1-3 wherein said drain gutter is formed from poured concrete and said other gutter sidewall is poured to substantially the height of said interior floor during formation of said drain gutter. 5612D-NZ-D1
5. The system as defined in any one of claims 1-4 wherein said exterior formed surface is selected from the class consisting of a concrete slab, and pavers laid above a concrete slab.
6. The system as defined in claim 5 wherein the height of said other gutter side wall is less than the height of said interior floor by the thickness of pavers which are intended to be laid above said poured concrete.
7. The system as defined in any one of claims 1-6 wherein the width of said drain gutter is approximately 200mm and the width of said gap is at least 10mm.
8. The system as defined in claim 7 wherein the width of said gap is approximately 12mm.
9. A method of forming a threshold drain extending alongside an exterior wall of the building, said building having an interior floor and said threshold drain being formed in an exterior formed surface which is substantially flush with said interior floor, said method comprising the steps of: in a single concrete pour, forming a drain gutter and said exterior formed surface, said drain gutter having a base and two side walls, one of said sidewalls being substantially aligned with said building and the other of said sidewalls being spaced from said building wall, supporting a grate support frame having a pair of elongate rims by a plurality of cantilever arms, each of said cantilever arms being secured to the other side wall of said gutter after formation thereof, said frame having a width between said rims which is less than the width of said gutter, and supporting a grate on said frame and located between said rims, whereby a gap is created between said building wall and the rim closer to said building wall, said gap extending alongside said building wall.
10. The method as defined in claim 9 including the further steps of forming each of said cantilever arms as a substantially right triangle having a first substantially vertical edge, a second substantially horizontal edge, and a third 5612D-NZ-D1 edge forming an hypotenuse, securing said first substantially vertical edge to said other side wall, and supporting said rims by said second substantially horizontal edge.
11. The method as defined in claim 9 or 10 including the further step of releasably locating said grate between said rims.
12. The method as defined in any one of claims –9-11 wherein said exterior formed surface is selected from the class consisting of a concrete slab, and pavers laid above a concrete slab.
13. The method as defined in any one of claims 9-12 wherein the width of said drain gutter is approximately 200mm and the width of said gap is at least 10mm.
14. The method as defined in claim 13 wherein the width of said gap is approximately 12 mm. Dated this 4 day of January 2019 ACO Limited FRASER OLD & SOHN Patent Attorneys for the Applicant
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ743481A NZ743481B (en) | 2017-06-20 | Threshold Drain System and Method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ743481A NZ743481B (en) | 2017-06-20 | Threshold Drain System and Method |
Publications (2)
Publication Number | Publication Date |
---|---|
NZ743481A NZ743481A (en) | 2019-03-29 |
NZ743481B true NZ743481B (en) | 2019-07-02 |
Family
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