Note: Descriptions are shown in the official language in which they were submitted.
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BACKGROUND OF THE IN~ENTION
The present invention relates to an expansion
jointing material for placing concrete, mortar or the like
which i9 capable of fully absorbing or compensati~g for
the expansion or contraction of the deposited concrete,
mortar or the like, is easily and positively settable
in any place or position and is capable of easily produc-
ing smooth l~id surfaces of concrete or the like.
Jointing material is an indispensable material in
applications where concrete, mortar or the like is used,
and a variety of jointing materials have been extensively
used in of*ices, schools, apartment houses, factories,
warehouses, parking places, pla-tforms, underground markets,
roads and other rooftops, floors, wallseand roads
surfaces.
Concrete or mortar usually expands or contracts
at a rate of 10 5 per 1C and has a tensile stress of
about 20 Kg/cm and Young's modulus of between 200,000 to
280,000 Kg/cm. Therefore, if, for example, any laid
rooftop of concrete or mortar is subjected to a tempera-
ture of 60C in midsummer, the resulting e~pansion or
contraction amounts to as much as 200,000 Kg/cm x 10 5
x 40~C and this cannot be withstood by any means with the
tensile stress of 20 Kg/cm thus causing strains or cracks.
25 . To overcome this problem, jointing material is used.
~ile -the known jointing materials ha~e been primarily
; developed ~or the purposes of compansating for the
expansion or contract~on of concrete or mortar, there has
still existed a need -for an impro~ed jointing material
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which has an improved expansion or contraction absorbing
ability and which can be easily and positively installed
or laid.
However, the conventional jointing materials ara
disadvantageous in that their Ability of absorbing
expansion or contraction is generally insufficient and
those having a good absorbability have disad~antages of
o~e,~ t
~ being ~=C~WY}rRYR~ in handling and requiring much time ..
; and labor in laying them. For instance,.while rubber
jointing material has a good absorbability, it has
disadvantag0s of being inferior in setting property,
re~uiring much time and labor in setting, and requiring,
even i~ it is set, an.y additional means to provide the
required "reference" for smoothing a freshly laid surface ::
of concrete since the m~terial tends *o be deformed by ..
- the deposited concrete. On the other hand, asphalt
jointing material is also inferior in absorbing ability
and is really unhandy and inefficient since its setting
; requires preliminary steps, namely, after preliminarily
placing concrete with the ai~ of forms, the forms are
removed from the thus laid surfaces of concrete arld then ~:
the asphalt jointing material is inserted into each of ;:
the resulting grooves. One further inconvenience is
that the provision of the ~reference" requires the use
~5 of a leveling string which is stretched at every corner :
or the use of a plurality of studs which are projec-ted
from the laid surfaces and a vertically movable member
such as a nut which is fitted on each stud to adjust the
height of the stud and support between the nuts a plate
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for providing the required "reference". As a re~ult, to
place concrete, mortar or ths like over a considerably
large area requires much time and labor and the resulting
finished surfaces tend to produce irreg;ularities despite
the use of much time and labor. Thu~, there has existed
a long felt need for overcoming foregoins deficiencies.
SUMMARY OF THE INVENTION
In accordance with the present invention, an
impro~ed jointing materia1 is provided which o~ercomes
the foregoing deficiencies of the prior art jointing
ma-terials.
Therefore, it is an objec-t of the present invention
to provide an improved jointing material having an improved
compensating ability again~t the expansion or contraction
of concreta, mortar or the like, that is, an ability
whereby when concrete or the like expands the material
tends to shrink to absorb the expansion, whereas when
the concrete or the like contrac-ts tho material tencls to
restore its original shape to absorb the contraction.
I* is another object of the present invention to
pro~ide an improved jointing material comprising two
elementary component members namely, a jointing material
proper made of an elastic member to absorb or compensate
for,expansion or contraction of concrete, mortar or the
like and a co~er member which is placed over the elastic
member in the longitudinal direction thereof whose upper
surface is formed ~ith reference levels or surfaces for
; producing laid surfaces of concrete and ~arious additional
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means .
It it still another object of the present invention
to provide such improved jointing material in which the
cover member is urth~r divided into a clamping sectîon
fitted on the jointing member proper a;nd an elastic
reference section formed with reference surfaces, and
the reference section i9 slidably, detachably and replace-
ably fitted on the clamping section.
It is still another object of the present lnvention
to provide ~uch improved jointing material which is easily
set in any desired position (if desired, over the 0ntire
area) of a rooftop, floor, wall or the like in prepara-
tion for th~ reception of concrete, mortar or the like
and the height of its reference sur~aces is ad;justed as
desired.
The foregoing and other objects, features and
advantages of -the in~ention will become apparent fro~
the following more particular description o~ ths prefer- -
red embodiments of the invention as illustrated in the
~ccompanying drawings.
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BRIEF DES5RIPTION OF THE DRAW~NG
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Fig. 1 is a partial perspective view showing a~
embodiment of a jointing material according to the
invention.
Fig. 2 is a sectional view showi~lg the jointing
material of Fig. 1 in place on a floor and concrete
deposited around the jointing material.
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Fig. 3 is a partial perspective view sho~ing a
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modification of the jointinS material of Fig. 1 in which
the cover member includes a clampins section ancl an
elastic reference section.
Figo 4 is a sectional view t~ken along the line
IV-IV of Fig. 3.
Figs. 5 and 6 are partial perspective views
showing modifica-tions of the jointing material of Fig. 3
in which th~ cover member includes a clamping section
and an elastic reference section which are joined together
by means of male and female structures.
Figs. 7 and 8 are sectional views respecti~ely
taken along the lines VII-VII of Fig. 5 and the line
VIII-VIII of Fig. 6.
Fig. 9 is a partial sectional view showing a
modification of the jointing materials shown in Figs. 5
and 7 in which the positions of the male and female
structures are reversed.
Fig. 10 is a perspective view showing an exemplary
form of the support leg assembly used with the jointing
material of the invention.
Fig. 11 is a sectional view showing the manner
in which the support leg assembly of Fig. 10 is mounted
; in the jointing material shown in Figs. 1 and 2~
Fig. 12 is a partial plan view showing the
manner in which the jointing material shown in Figs. 6
and ~ is set in place on a floor level.
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DESCRIPTION OF THE PREFERRED EM~ODIMENTS
Ref~rring first to Figs. 1 and 2 9 an e~bodiment
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of a jointing material according to the invention will be
described. In Figs. 1 and 2, numeral 101 designates a
jointing material proper which is made of an elastic
member such as an expanded st~rol resin having a predeter-
mined length and thickness ag shown in the figures. The
jointing ma-terial proper 101 is formed with a joint
surface 102 at each of its ends lengthwise and it is
also formed ~ith a sole surface 103 on the lower par-t.
Each of the sole and joint surfaces 103 and 102 is ;Eormed
with a smooth surface so that when the jointing material
is longitudinally joined with another jointing material
or when the jointing material is set in place on a floor,
wall or the like, the smooth plane surface ensures a
close c,ontact with the mating surface. Numeral 10
desig~ates a co~er member which is placed longitudinally
.
over an upper portion A of the jointing material proper
101 and it is made of an elas-tic synthetic resin such as
vinyl chloride resin member having -the same length as the
jointing material proper 101 and a substantially inverted
U shaped cross section. The cover member 104 lS Eormed
with a projecting reference surface or level o~ each of
the longitudinal upper sides so tha-t these reference
surfaces for the required laid surfaces of concrete,
mortar or the like when depositing concrete, mortar or
the like.' Formed inside the reference side surfaces
105 and 106 is a wide V-shaped plane 107 which in turn is
formed with a downwardly raised projection 107a at the
; central portion thereof. Side portions 108 and 109 which
constitute a clamping section B of the cover member 104
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are respecti~ely provided with wavy side faces 110 and 111
of une~en faces which may for example be bellows like
faces or dancette faces. Numerals 112 and 113 designate
intermediate portions bet~een the upper portion A oP the
cover member 104 and the clamping sect;ion B and the inter-
mediate portions 112 and 113 respecti~ely provide
- clearances 114 and 115 between the intermediate portions
112 and 113 and the upper section A. When the placing
of concrete is completed, the clearances 114 and 115
produce cushioning effects.
A modification of the jointing material of ~ig~.
1 and 2 will now be described. The cover mem~er 104 :is
formed into an inverted U shape and the reference surfaces
105 and 106 are directly formed on the upper section A.
Howe~er, the part of the upper section A including the
reference surfaces is located above the clamping sec-tion
B and this part is made of a material which is softer
than ~he clamping section B to provide an improved
co~pensating property against the expansion or contraction
of concrete, mortar or the like. This modification will
now be described with reference to Fig~. 3 and 4, in
which numeral 201 designates a clamping section constitut-
ing a part of a cover member 20~ and i-t is made of a
t ~
- substance such as vinyl ~ide which when formed into
a plate exhibits a suitable resilie~ce against bending
force. Numeral 203 designates engaging projections
inwardly projecting from the lower end edge~ of the
clamping section B and the projections 203 engage with
-the cut and bent protrusions of a support leg assembly
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that ~ill be described later to fixedly hold the legs in
place when the latter are inserted into the clamping
section 201. Numeral 204 designates an elastic reference
section projected and arranged in place above the
clamping section 201, and the reference section 20~
constitutes,along with the clamping section 201, the
cover member 202. The elastic reference section 204 is
protrusively formed above the clamping section 201 in ~:
I the followlng ~anner. Namely, a projecting band 206 is
formed on the central upper surface o~ an upper wall 205 .~.
: and an upper elastic portion 207 is formed to extend to :
both sides of the upper end of the projecting band~e~ in
the form of a moderate V-shape. The sides of the ~pper :~.
elastic portion 207 are substantially inwardly bent ; .
toward *he upper wall 205 of the clamping section 201 to :.
' ~orm elastic side portions 208 and the upper end of each
: elastic side portion 208 is projected above the surface ::
~ of the upper elastic portion 207 to form a reference :
;~ surface 209. A small clearance 210 is provided between
the lower end edge of each elastic side portion 208 and
the surface of the upper wall 205 of the clamping section
201, and a clearance 211 is defined on aach side o~ the
projecting band 206 by the projecting band 206, the upper
elastic portion 207 and the elastic side portions 208.
Numeral 212 dasignates a rec-tangular jointing matsrial
proper made of an elastic substance such as sponge,
Elas-tite or expanded styrol, and -the clamping section
201 o~ the cover member 202 is fitted over the upper
~;~ sides o~ the jointing material proper 212. Nume:rals
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213 and 214 designate wavy portions formed on side walls
215 of the clamp:ing section 201 and th~e outer side face~
o~ tha elas-tic re~erence portion 204. When concrete i9
placed, the wa~y portions bite into the concrete so that
water such as rainwater is prevented to leak i~to the
- concrete below the reference surfaces 209 and at the sa~e
time an improved adhesion is ensured between the concrete
or mortar and the jointing material. Numeral 216
designates a support leg assembly disposed as the
occasions demand between the clamping section 201 of the
cover member 202 and the jointin$ material proper 21
The details of the support leg assembly 216 will be
described later.
The elastic reference section 204 may be modi~ied
as follows. Namely, the lower ends of the elastic side
portions 208 are fixedly mounted on the upper portion of
the clamping section 201 to eliminate the clearances 210,
and the projecting band 206 and the upper elastic
; portion 207 a~e eliminated. In this ~ay, the expansion
Con~,~aa ~1
or 4errarnSr o~ concrete may be absorbed by the inward
elastic deformation of the ela~tic side portions 208.
- I~ still another modification, the elastic re~erence
- section 204 is provided by fixedly mounting on each side
o~ ths projecting band 206 an elastic piece made of the
same elastic substance as the jointing material proper
~ 212 such as sponge. In this case, the upper elastic
; portion 207 and the elastic side portions 208 are
elimi~ated and the upper end ed~es o~ the projecting
~`~ band 206 serve as the necessary reference surfaces.
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In the jointing material shown in Figs~ 3 and 4,
the reference section 204 constitutinS a part of the
co~er member 202 is made of an elastic material and the
reference section 204 is made in-tegra]L ~i-th and proJected
upwardly from the clamping section 20L~ Howe~er, instead
of projecti~g the elastic reference section from -the
clamping sectionij they may be formed separately with the
male and female portions ~hich may be slidablyg detachably
and replaceably fitted with each other. Such form~ of
jointing material will now be described in reference to
Figs. 5 to 9.
Referring first to Figs. 5 and 7, numeral 301
designates a cover member including a clamping section
302 made of hard vinyl chloride or the like and ha~ing
: ; .
; 15 engaging protrusions 303 inwardly formed at its lower
ends, and the upper portion of the clamping section is
substantially formed into inverted W-shape or M-shape in
cross sec-tion. Numeral 304 designates a pair of holding
walls arranged at opposing po~itions on an angle portion
305 to provide a suitable engaging space 306 and the
upper ends o~ the holding walls 30~ are inwardly bent to
:~ define an insertion opening 307. The~e elements
constitute a female half 308.
Numeral 309 designates an elastic reference
: 25 section which is detachably fittable inside the engaging
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space 306 and it is provided on .its lower portion a male
half 310 longitudinally extended and arro~-shaped i~
' ~ cross section. The elastic reference section 309 is
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. made of a soft elastic substance such as a soft s~nthetic
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r ~ o ~ r~
resin which is easily deformable and~e~&~e and it i9
formed into a cylindrical shape having side walls 311, an
upper wall 312 and a lower wall 313 wh:ich in turn define
an inner space 314. Numeral 315 desig]~a-tes reference
surfaces projected on the upper sides of the elastic
reference section 309 and these reference surfaces will
be exposed flush with freshly laid surfaces of concrete
after the completion of concrete placement. The upper
~urface of the upper wall 312 will also be exposed flush
with the laid surfaces of concrete. Numeral 316 designates
corrugations formed on the outer surfaces of the side
wal~s 311 of the elastic reference section 309, and
numeral 317 designates a rectangular elastic jointing
material proper which is made of an elastic substance
such sponge, Elastite or expanded styrol. Numeral 322
designates a support leg assembly which ma~ be suitably
inserted between the jointing material proper 317 and the
clamping section 302 of the cover mem~er. The details
of the support leg assembly 322 will be described later.
The above-mentioned male and fe~ale structures ma~
be provlded on the elastic reference section and the
clamping sectîon in the reverse relation with that of
Figs. 5 and 7. In other words, as shown in Fig. 9,
~ instead of providing the male half 310 on the lower
surface of the elastic cylindrical reference section 309,
the reference section 309 may be provided with a longitu-
dina} engaging opening 318 to provide the required
female structure, while on the other hand the upper
portion of -the clamping section 302 may be formed into a
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wide inverted V-shape a~d a T-shaped male half 319 may
be projected at the central portion of the upper surface
; of the clamping section 302 to e~tend in the longitudinal
direction thereof. A holding project:ion 321 is formed
at the central portion of the inner surfa~e o~ an upper
wall 320 of the elastic reference sectlon 309 *o extend
in the longitudinal direction thereof and the lower
surface of the holding projection 321 is positioned
opposite to the upper surface of the T-shaped male half
319, so that the elastic reference section 30~ is prevented
from being deformed excessively when a pressure is applied
to the upper surface of the elastic reference section 309.
' Numeral 323 designates a support leg assembly which is
; similar to the previously described support leg assembly
322.
In the embodiment shown in ~igs. 6 and 8, the `,
jointing material is designed so that the upper portion
i of a clamping section is shaped to easily absorb shocks ;~
applied to an elastic reference section and the upper
portion itself of the clamping section is formed to serve
the function of the elastic reference ~ection when the
elastic reference section has been removed from the
clamping section. In other words, in Fig~. 6 and 8
rlumeral 401 designates a cover member having clamping
portions 40~ and 403 which are made of hard vinyl chloride
or the like. Engaging protrusions ~04 and 405 are
provided at the lower ends of the clamping portions 402
; and 403 to extend in~ardly thereof and the upper portions
of the clamping portions 402 and 403 are respectively
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provided with inwardly ~-shaped ben* portio~s 406 and
407. The upper ends of the clamping portions 402 and 403
form a continuous upper wall 408 which is formed into
a wide V-shape. Numerals 409 and 410 designate a pair
of holding walls arranged at opposing positions in the
bottom por*ion of th0 V-shaped upper wall 408 to project
therefrom at right angles and pro~ide a suitable engagins
space 411 in the space between the holding walls 4Q9
ancl 410. The upper ends of the holding ~alls 409 and
~10 are inwardly bent to form engaging walls 413 ancl
414 which define an insertion opening 412. The~e elements
constitute a female half. The fact that the upper ends
of the engaging walls 413 and 414 are located below the
ends of the upper wall 408 constitute an important
faature of this modification. On the other hand, .,
numeral 4~5 de~ignates an elastic refsrence sectio~
having an inverted T-shaped male half 416 projected from
the lower surface thereof for detachable engagement in
the engaging space 411~ The elastic reference section
415 is made of a soft elastic substance stlch as soft
synthetic resin which is easily deformable and recover-
able and it is formed into cylindrical shape having
side walls 417 and 418, an upper wall 419 and a lower
wall 420 which define an inner space 421~ The lower end~
f th~ side walls 417 and 418 are respectively formed
with mounting faces 422 and ~23 ha~ing substantially the
sam0 angle of inclination as the inclined upper s~rface
o~ the upper ~all 408 so that when the male half 416 is
inserted into the engaging space 411, the mo~utting faces
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422 and ~23 are positioned on the outer side ~pper surface
t~ ;~ of the upper wall 408. Numerals ~ and k25 designate
reference sur~aces projected at each side of the upper
surface of the elastic reference section 415 so that
when concrete is placed the reference surfaces 424 and
425 are exposed and flushed with the laid surfaces of
concrete. In this case, the upper end surface of the
upper uall 419 is also exposed on a level with the laid
surfaces of concrete. Nwnerals 426 and 427 designate
corrugations formed on the outer surfaces of the side
walls 417 and 4~8 of the elastic reference section 415
Numeral ~28 designates a rectangular elastic jointing
material prop~r which is made of an elastic substance
such as sponge, Elastite or expanded styrol. ~umeral 429
designates a support leg assembly which may be inserted
as occasions demand between the elastic jointing material
proper 4Z8 and the clamping portions 402 and 403 of the ~ ~;
cover member (the details of the support leg assembly
will be described later).
The jointing materials according to the embodiments
of the invention which have been described so far have
for their prlncipal object the improvement of their
ability to compensate for the expansio~ or contractio~
of concrete, mortar or ~he like, and these jointing
materials may incorporate a support leg assembly of the
type that will be described hereunder for setting the
jointing material in place on a rooftop, floor or ~all.
One form of such support leg assemblies will be described
with reference to Figs. 10 and 11. A suppor-t leg
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assembly 500 includes a pair o~ adjustable leg portions
501 and 502, bod~ portions 503 and 504 ~hiGh are continu-
ously extended re~pectively from the leg portions 501
and 502 and a head portion 505. The body portions 503
~nd 504 and the head portion 505 are substantially
inverted U shaped in cross section and particularly the
head portion 505 is designed to have a cross-sectional
shape corresponding to the upper inner sides of the
clamping portions. For instance, with the support :Leg
assembly 500 of Fig. 10 which is designed for incorpora-
tion with the cover member 104 shown in Figs. 1 and 2,
the cross-sectional shape of the head portion 505 is
~ormed to conform with the shape of the upper section A
of the cover member lO~o Since the support leg assembly
5 must be positively and stably fitted in the clamping
section of a variety of cover members ~hen i-t is mounted ; -
in place, a portion of each of the body portions 503
and 504 is cut and bent out~ardly to provide a projecting
` piece. These projecting pieces are shown at 506 and 507
in Figs. 10 and 11 and the projec-ting pieces 506 and 507
are respectively received into clearances 114 and 115
preliminarily provided on both sides of the clamping
section. In other forms of jointing material shown in
Figs D 3, ~ 5~ 6, 7, 8 and 9, the longitudinally extended
innex protr~sio~ (203, 303, ~0~, 405) have been prelim-
inarily provided on the inner side~ of the lo~er ends of
the clamping section and there~ore the support leg
asse~bly (216, 322, 3239 429) is provided with the
corre~ponding cut and bent projections (2171 324, 325,
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430) for engagement with the inner protrusions. In
Fig. 10, numeral 50~ designa-tes leg portion rein~orci~g
ribs and numeral 509 designates bolting or fixing holes.
Further, since the support leg assemblies (500, 216, 322,
323, 429) are similar in shape and construction, the shape
and construction of the support leg assembly 500 have
been described by way of example.
The jointing materials according to the above
described embodiments are sat in place on a rooftop, '
floor or wall for placing concrete, mortar or the like
in the following manner.
Firstly, the jointing material shown in ~igs. 1
and 2 is used in the following manner.
The cover member 104 is fitted on the upper
portion of the jointing material proper 101 so that the
sides and the upper s-urface o~ the jointing material
proper 101 are covered respectively by the side portions
108 and 109 and the upper surface 107 of the cover
member 104 and -the cover member 104 islcarried by the
jointing material proper 101.
In operation, the jointi~g material proper 101
with the cover member 104 mo~ted t~ereon is set in
place on the site through the in*ermediary of its sole
surface 103, and a plurality of the jointing materials
~25 are successi~ely connected,len~Nis~ by means of thei~
joint surfaces 102 and another p~urality of the jointing
materials are also successively arranged crosswise and
side by side at predetermined intervals, In -this case,
each of the jointing materials is fixedly secured in
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position by means of l~nps of mortar or the like ~lich
are arranged on the sides of the sole surface 102 of`
the jointing material proper 101 at suitabl.e inter~als,
and concrete, mortar or the li~e is suitably deposited
to become flush with the reference surfaces 105 and 106
on the upper portion of the cover member 104 ~Fig. 2~.
Thereafter, a tool for smoothing f.reshly laid surfaces
of concrete or the like, such as, a float or patter is
slidingly moved over the reference surfaces of -the paral-
lel cover members 104 thus smoothing the laid surfaces
of concrete or the like into level planes according to
the reference surfaces 105 and 106 ~ithout re~uiring any
special skill. In this case, since the reference
surfaces 105 and 106 of the jointing material are
projecting beyond the V-shaped surface 107, the 1'smooth- :
ing~' of the concrete surfaces adjacen-t to the JOinting
materials is accomplished with an excellent finish. :~:
When the concrete placi~g is completed, by virtue o-f the
fact that the cover ~ember 104 having the corrugated
side faces is mounted on the jointing ~aterial propar
101, the ability of the cover member 104 to deform and
regain the original shape positi~ely absorbs and
compensates against the expansion or contraction of the
deposited concrete. Further, since the clamping section
of the cover member is corrugated, it has an improved
affinity with the deposited concrete and this has,
coupled with-its defor~ability and recoverbility, the
effect of preventing any separation bet~een the deposited
cvncrete a~d the jointing material. Moreover, there is
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an additional effect of reinforci~g the cover member
itself thus facilitating the handling of the jointing
material. Therefore, this jointing material is best
suited for use in placing concrete, mortar or the lik0.
On th~ other hand, ~here the support leg assembly
500 is incorporated in the jointing material as shown in
Fig. 11, the body portions 503 and 504 of the leg
support assembly 500 are placed inside the co~er member
104. More specifically~ the leg support assembly 500 is
slidingly inserted from one end of the cover member lO~
into inside the clamping section B of -the cover member
104 thus inserting and fitting the projecting pieces
506 and 507 of -the support leg assembly 500 in the
clearances 114 and 115, respectively~ In practice, a
plurality of the support leg assemblies 500 are -fixedly
mounted inside the cover member 104 at predetermined
intervals. Therea-fter, the upper side portions of the ,~
jointing material proper ~01 are inserted and fitted in
the cover member 104 through the opening at the lower
end thereof and thus the cover ~ember 104 is placed on
and carried by the jointing material proper 101. In
laying the jointing material, the leg portions 501 and
502 of the support leg assembly 500 are operated to
adjust the height of the reference surfaces 105 and 106 - -
and the iointing material is set in place on the sur~ace
to be covered with conorete. A set of the jointing
materials each having adjusted the height of its reference
surfaces through a plurality of the ~uppor-t leg assemblies
are successively connected lengthwise in parallel rows
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and another ~et of the similar ~ointinS materials are
successively arranged crosswise 'between the parallel
jointing materials at predetermined intervals to lay the
jointing materials at right angles to eac'h other.
Thereaftar1 concrete, mortar or the like is placed in
the previously mentioned mannerO Thus, by virtue of ~-
the fact that the jointing materials are supportad by the
support leg assemblies, the set height of the reference
surfaces may be easily adjusted to meet the requirements
of the site and moreover the jointing materials ~ay b,e
used in any desired positions -thus improv:ing the operat-
ing efficiency.
With the jointing material shown in Figs. 3 and 4, ,,~
the head portion and the body portions of each support '~:'
leg assembly 216 are inserted into the clamping section
201 of the cover member so that while in the couxse of :
this process the bent projections 217 of the support leg .
as~embly are inwardly pressed by the engaging protrusions
203 of the clamping section, the bent proJeCtion 217 are
positively engaged and fixed in place by the engaginS
protrusions 203 and e~entually the leg a~sembly 216 is
engaged fixedly downwa~dly of the sides of the cover
member 202. Then, the upper side portions of the
jointing material proper Z12 are compressively inserted
into the support leg assemblies and the clamping section
201 of the cover member 202. ~ile the elastic jointing
material proper 212 may be honded inside the cover member
202 by means of an adhesive, the use of adhesive is not ~,
alway~ required since the jointing material proper 212
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is held in place by virtue of the recoverin$ property
~ tl~g ~
"~.~ of the proper~212 itself ~hich is clamped by the support
leg assemblies 216 and the cl~mping section 201.
After the co~er member, -the jointing material
proper and the support leg assemblie~ have been assembled
together in the manner described above, the placing of
concrete, mortar or the like is accomplished by using
the jointing materials in the same manner ~s the jointing
material of Figs. 1 and 2.
iO While the thus placed and set concrete, mortar or
the like expands or contracts depending on the various
surrou~lding conditions such as humidity and dryness, the
6e fo .J
expansion or contraction of the concrete placed.~el
the lower surface of the cover member 202 is absorbed
by the jointing material proper 212, while the expa~sion
or contraction of the concrete placed in the vicinity -.
of the sides o~ the cover member 202 is absorbed by the
elastic displacement of the clamping section and the
elastic jointing material proper 212. On the other ha~d,
the expansion or contractio~ of the concrete placed in
the vic.inity of the upper portion o~ the cover member
202 or the elastic reference section 20~ is positively
absorbed or compensa-ted by the fact that the elastic
side portions 208 displace toward the clearances and the ~ :
elast~c upper portion 207 displaces upward along with
the elastic side portions 208 in response to the expan~
sion of the concrete or the like.
Next, the jointing materials of the type w~ich
employ~ separate elastic reference section and the
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.
~s~
clamping section are used in the following manner.
Firstly, in -the case of the jointinS material shown in
Fig~. 5 and 7, to set the jointing material in place on
a surface 600 to be covered with co~crete or mortar,
such as, a floor or wall as shown in Fig. 12, tha height
of the reference sur~aces 315 is adjusted to a desîred
concrete thickness with or without the aid of t~e support
leg assemblies and a set of the jointing materials are
connec-ted together lengthwisb and another set of the ~ -~
jointing materials are laid crosswise. In connecting
the jointing materials lengthwise, instead of aligning
the ends of -the elastic reference section 309 and the
clamping section 302 as sho~n in ~ig. 5, the ela~tic
referenca section 309 is slid to the right in the
illustration along the engaging space 306 in the female
half 308 of the clamping section 302 to shift it relative
to the clamping section 302 and the male half 310 of
thenelastic reference section 309 in another jointing
material is fitted in -the thus shifted engaging space
306. In this way, the plurality of the jointin~ materials
may be positi~ely connected lengthwise with one another.
In this way, as shown in Fig~ 12, the jointing
materials are laid on the surface 600 which is to be
covered with concrete, mortar or the like and the
25~ placing of concrete, mortar or the like is accomplished
in the same manner as in the case of the previously
mentioned embodiments. The expansion or con-traction of
the concrete, mortar or the like is compensated for in
substantially the same manner as the previously described
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: .
;, : . . .
~5~8~ -
embodiments. In the jointing material of this ~mbodiment,
however, the clamping section 302 and the ~lastic
reference section 309 are separately pr,ovided ancl moreover
these sections are both detachable and replaceable~
Therefore, at the expiration o-f a predetermined time
a-fter the JOinting materials ha~e been laid in the
concrete or the like, the broken or ~rorn reference
sections may be replaced and moreo~er the joint~ng ma-terials
may be advantageously used in such applications as the
floor of a parking area where the jointing materials are
subjected to large impact.
The jointing material according to the embodiment
of Fig. 9 has substantially the same function and effect
as the embodiment of Figs. 5 and 7 and -therefore it will
not be described herein~
Nex-t, the jointing material according to the
embodiment of Figs. 6 and 8 will be described. The
elastic reference section 415 and the clamping portions
402 and 403 may be engaged with each other by simply
fitting their male and female structures ~ith each other
and therefore no further description will be made. To
connect the jointing material to another jointing
ma-terial lengthwise, the cover member is slightly
displaced, particularly the elastic reference section
415 is displaced relati~e to the clampin$ portions 402
and 403 and the corresponding parts of another jointing
material are engaged with the thus shifted por-tio~s in
*he same manner as in the previously described embodi-
ments. The placing o~ concrete~ mortar or the like is
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1~5~0~
accomplished in the s~me ma~ner as in 1;he previously
described embodiments. With the jointing material of
this embodiment, however, the lo~er surfaces of the
e~as-tic reference section 415 are placed on the upper
surface of the clamping portions 402 and 403 and
consequently the expansion or contraction of the entire
thickness of the deposited concrete from the upper end
to the lo~er end may be wholly absorbed by the fact that
there is no gap between the elastic referenc0 section
415 and the clamping portions 402 and 403. Thus, the
occurrence of any curves, cracks and crevices in the set
surfaces of concrete may be prevented. Further, since
the clampins por-tions l~02 and 403 and the elastic
reference section 415 are de-tachably engageable with
each other, after the expiration of a predetermined time
any broken or worn out reference sections may be
replaced, and the join-ting material of this embodiment
may be used in applications such as the floor of a
parking area where the jointing material is subjeGted to
strong impact as was the case in the previously men-tioned
embodiment. Furthermore, since the lower surfaces of
the reference s~ction 415 are placed adjacent to the upper
surface of the clamping portions 402 and ~03, when
impact is applied to the upper surface of the reference ~;
section 415, the impact is efficiently and positively
absorbsd by the clamping portions 402 and 403 along with
the resiliency of the reference section 415 as mentioned
earlier and consequently the damage to the reference
section may be minimized even if the jointing m~terial is
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',' ' ' , ~ ' :
~5(~
used in applications such as the floor of a parking area
where the jointing material is subjected -to strong~impact.
Fur*her, since, as w:ill be seen ~rom ~igs. 6 and 8,
the upper wall 408 of the clamping portions 402 and 403
is formed into wide V-shape and the holding walls 409 and
410 constituting the female half are confined within the
depth of the bottom portion of the V-shape, the shape of
the upper wall 408 on the whole substantially corresponds
to that of the elastic reference section 415, and even if
the elastic reference section 415 is removed, -the upper
portions of the clamping portions 402 and 403 may
perform substantially the same function as the elastic
reference section 1~15. For instance, the upper ends of
the ~-shaped bent portions 406 and 407 on the clamping
portions 402 and 403 may be used to function in the same
manner as the reference surfaces.
It will thus be seen from the foregoing description
that the jointing material provided in accordance with
the present invention has the advantages, such as; (1)
improved compensating ability against the expansion or
contraction of concrete, mortar or the like in addi-tion
to its primary functions which are far superior to those
of ths conventional devices, (2) any number of the
jointing materials may be i~terconnec*ed lengthwise as
desired and the su~oport leg assemblies may be utilized
to set within a shvrt period of time a number of the
jointing materials in place over a wi,de area to be
covered with concrete, mortar or the like, thus greatly
improving the laying efficiencyl and (3) the elastic
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~'' . ,
~L05~
reference section constitut:ing part of the cover member
may be replaced as occasions demand. Therefore, the
jointing material provided in accvrdance with the present
invention i~ best suited for use in the various applica-
tions mentioned earlier.
'
~.
.
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