Note: Descriptions are shown in the official language in which they were submitted.
1~759~1
This invention relates to a form tie and insulatlng
board retaining structure, to a form structure including
it and to a building method.
Concrete walls have many structural benefits such
as strength and durability. A shortcoming is that they
have little insulating value. The cold therefore
penetrates into wall leaving a cold,damp inner surfaces.
There is also a loss of heat from within residential
or commercial structures.
Because of the foregoing problem, and in view
of the emphasis now placed on saving energy, concrete
sandwich walls are becoming increasingly popular. Such
concrete sandwich walls are walls which are poured in
place with an insulating board in the centre of the wall.
The insulating board which may for example be a cellular
plastic material of the type known under the trade name
- styrofoam, is continuous throughout the centre of the
wall.
; One of the main problems in building concrete
sandwich walls is to secure the insulators in the centre
of the wall to prevent it from floating or from moving
towards one surface of the wall while the concrete is
being poured. It will be appreciated that if dislodgement
of the insulation takes place it will be a matter of great
difficulty to restore it to its intended position. It
may even be necessary to demolish and rebuild the wall.
An object of this invention is therefore to provide
a device which will maintain an insulation board firmly
in its intended position.
A further object is to provide such device which is
compatible with existing building methods.
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Another object is to provide such device which can
be readily fabricated at a low cost.
In accordance with one aspect of the present
invention, an insulating board clip is provided adapted
for securement to a form tie connecting forms for
concrete to thus provide a retaining member generally
centrally secured to the form tie; said clip comprising,
- in combination: a central, generally planar plate section;
a first generally planar retaining section integral with
said central section and disposed at one end thereof;
a second, generally planar retaining
section integral with said central section and disposed at the
other end thereof; said first and second retaining sections -~
being generally coplanar with said central section; weakening
means between each of said ends of the central section and the
respective retainer sections; said weakening means being of the
type rendering the respective end sections bendable upon
securement of said central section to form a tie, while retaining
the securement between the central section and a form tie;
whereby said clip can be secured to a form tie in a generally
flat, planar state and, following penetration of the tie and
of the flat clip through an insulating board, the retaining
sections can be bent to retain the insulation board therebet~een.
In another aspect of the present invention, a .
building member is provided which comprises a form tie for
connecting forms for concrete and an insulating board retaining
clip member centrally secured to the form tie and comprising, in
combination: a central, generally planar plate section; a first
30 generally planar retaining section integral with said central
section and disposed at one end thereof; a second, generally
planar retaining section integral with said central section .
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and disposed at the other end thereof; said first and second
retaining sections being generally coplanar with said central
section; weakening means between each of said ends of the
central section and the respective retaining sections; said
weakening means being of the type rendering the respective
end sections bendable upon securement of said central section
to form a tie, while retaining the securement between the
central section and said tie.
Preferably, at least one of said retaining sections
is shaped for ease of penetration of an insulating board. It
is also preferred that one of the retaining sections be pointed
for ease of penetration of the insulation board and the other
of the retaining sections has a V-shaped notch conforming with -
the pointed retaining section so that a series of clips can
be punched from a metal strip at virtually no waste. It is
also preferred to provide the weakening means such that it is
formed by spaced cuts along each side of the clip, the cùts on
the side being in alignment with the cuts on the other side to
define a plurality of said weakening means at each end of the
central section to enable said clip to be shaped to engage
different standard thickness of insulation board.
In a still further aspect of the present invention
a building method is provided which comprises the steps of
erecting a first apertured form panel for concrete, temporarily
attaching to its inner face an insulating panel, forcing a form
tie having a flat retaining member with a pointed leading 1-
surface centrally secured to same through the insulating board
and through an aperture in the said form panel and securing
said form tie in position, erecting a second apertured panel
parallel to the first, with the form tie passing through an
aperture in the second form panel, securing the form tie in
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relation to the second form panel, moving the insulation panel
to a central position with respect to the form tie with the
pointed leading surface having penetrated through the insulating
panel and bending the leading and trailing portions of the
flat retaining member to positions flush against the surfaces
of the insulating panel and thereafter pouring concrete into
the spaces between the insulating panel and the form panels.
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75928
In the drawings that illustrate the preferred
embodiments of this invention:
Figure 1 is an elevation view illustrating a form
tie and insulating board retaining member in accordance
with this invention;
Figure 2 is a plan view of the form tie and
insulating board retaining member of Figure 1;
Figure 3 is an elevation view similar to figure 1
but showing the retaining member in a position to secure
the insulating board;
Figure 4 is a plan view corresponding to Figure 3;
Figure 5 is an elevation view of a wall structure
showing the form tie and insulating board retaining member
when first inserted;
Fig.ure 6 is an elevation view of the structure in
Figure 5 but showing the retaining member in position to
.: . secure the insulating board;
Figure 7 is an elevation view of a section of a
wall structure illustrating the horizontal and vertical
spacing of the form tie and insulating board retaining members;
Figure 8 is a plan view of an alternate embodiment;
Figure 9 is an elevation view of a further alternative ~ :
embodiment; and
Figure 10 is a plan view of a further alternative
embodiment.
Referring now to Figures 1 and 2 of the drawings,
there is illustrated a conventional form tie 10 to which is
secured an insulating board retaining member 11.
Retaining member 11 has a central section 12 welded
or otherwise join~.d to a central portion of form tie 10 by
weld 13. Retaining member 11 also has a leading section 14
and a trailing section lS. Leading section 14 has inclined
10759Z8
leading surfaces 16 to provide a point to facilitate
penetration of the insulating board. Trailing section
15 has a corresponding V-shaped surfaces, so that a series
of retaining members can be stamped from a metal strip
with minimum waste of material. The sides of both the
leading section 14 and the-trailing section 15 have trans-
verse cuts 18 and 19. The cuts 18, on one side, are
aligned with the cuts 19 on the other side to define a
bend line indicated by dotted line 20. Cuts 18 are
sapced from each other so that standard thicknesses of
insulating board can be accommodated. For example the
spacing between 18 and 18a may be 1/2inch, between 18a
and 18b 2 inches and between 18b and 18c 1/2inch, so that
by utilizing different bending lines the insulation board
that is retained can be 2 inches, 2-1/2 inches or 3 inches
in thickness. Figures 3 and 4 illustrate the leading
and trailing portions bent down to form plates to retain
the insulating board. In this instance, the bend lines
~ 18a and 18c have been utilized so that the horizontal spacing
; 20 between plate means 14 and 15 c~n be 2-1/2 inches.
Figures 5 and 6 illustrate the application of a form
tie and insulating board retaining member as part of a
building form structure.
In Figure 5 outer form 21 is erected first and braced
in place by conventional braces (not shown), insulating
board 22 is applied temporarily to form 21 using common
nails 23. Form tie 10 with insulating board retaining
member 11 in its original flat position is then forced
through insulating board 22 and through a preformed hole
23a in form 21. Form tie 10 is then secured in position
by a cross brace or whaler (not shown in Figure 5) inserted
in whaler hole 24. Inside form 25 is then erected with form
1(~7~928
tie 10 passing through preformed hole 26 and an inside whaler
(not shown in figure S) is passed through whaler hole 27.
In the following step, the insulating board 22 is forced
over to a central position as shown in figure 6 and sections
14 and 15 are moved downwards to act with central section
11 to give a U-shaped configuration with sections 14 and
! 15 forming plates which lie flat against opposite surfaces
of in~ulating board 22. As previously explained appropriate
cuts 18 and 19 facilitate the bending operation. The
forms are then ready for the pouring of concrete.
As illustrated in Figure 7 the exterior wall forms
21 and 21a will have a number of rows of form ties 10, with
the form ties of each row in horizontal alignment to
permit the insertion of whaler bars 28.
In the embodiment described in figures 1 to 7, the
leading portion of the securing plate was pointed to
facilitate penetration of the insulating board. If however
vertical strips of insulating board of the same width as
the spacing between the ties 10 are used then it would be
unnecessary to have a pointed end as the retaining plate
29 could be forced into the side edge of the insulating board
and could then be rectangular as shown in Figure 8. In
figure 8 the retaining plate 29 is rectangular and has
lateral cuts 30 similar to cuts 18 and 19 of the first
embodiment. A further possibility would be to orient the
plate so that it bends about a vertical bending line as
shown in figure 9 which shows rectangular plate 31 in a
vertical plane and secured to tie 10, In the case of
figure 9 it would be necessary to bend the plates of
alternate rows in different horizontal directions to hold
both sides of the vertical insulating strips.
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In another alternative embodiment shown in Figure 10,
the retaining member is a bar 31 having a central portion
32 and bendable portions 33 and 34.
It will be appreciated that this invention provides
a simple and economical retainer for insulating board
which is compatible into existing building procedures and
yet which will hold the insulating board firmly while
the concrete is being poured.
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