CA1050800A - Expansion jointing material for placing concrete, mortar or the like - Google Patents
Expansion jointing material for placing concrete, mortar or the likeInfo
- Publication number
- CA1050800A CA1050800A CA232,467A CA232467A CA1050800A CA 1050800 A CA1050800 A CA 1050800A CA 232467 A CA232467 A CA 232467A CA 1050800 A CA1050800 A CA 1050800A
- Authority
- CA
- Canada
- Prior art keywords
- jointing material
- cover member
- concrete
- support leg
- mortar
- 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
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Abstract
EXPANSION JOINTING MATERIAL FOR
PLACING CONCRETE, MORTAR OR THE LIKE
ABSTRACT OF THE DISCLOSURE
An expansion jointing material for placing concrete, motar or the like which comprises a jointing material proper of elastic substance and a cover member placed over the jointing material proper to extend in the longitudinal direction thereof. In operation, a plurality of the jointing materials are preliminarily positioned and adjusted to a predetermined height along the partition lines to form a plurality of partitions into which concrete, mortar or the like is deposited to produce laid surfaces of concrete or the like using the upper portions of the cover members as the reference levels. The jointing materials are completely buried in the concrete, motar or the like except the upper portions of the cover members to absorb or compensate for the expansion or contraction of the concrete, mortar or the like.
PLACING CONCRETE, MORTAR OR THE LIKE
ABSTRACT OF THE DISCLOSURE
An expansion jointing material for placing concrete, motar or the like which comprises a jointing material proper of elastic substance and a cover member placed over the jointing material proper to extend in the longitudinal direction thereof. In operation, a plurality of the jointing materials are preliminarily positioned and adjusted to a predetermined height along the partition lines to form a plurality of partitions into which concrete, mortar or the like is deposited to produce laid surfaces of concrete or the like using the upper portions of the cover members as the reference levels. The jointing materials are completely buried in the concrete, motar or the like except the upper portions of the cover members to absorb or compensate for the expansion or contraction of the concrete, mortar or the like.
Description
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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
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 _ 3 _ , .
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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 - k -:', .
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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.
' 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 ~; - 8 -:`~
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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 ~ . .
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 , . .
. made of a soft elastic substance such as a soft s~nthetic :. ' ''~
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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 _ ~4 -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 : . . ., :
~L051D8~0 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, - lG -~os~
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 ~056)80~
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 ~.~508~
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 .
~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 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 - 2~ -',' ' ' , ~ ' :
~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 ~'' . , ~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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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 _ 3 _ , .
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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 - k -:', .
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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.
' 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 ~; - 8 -:`~
~0~8~ ~
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 . ~
_ g _ `
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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 ~ . .
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 , . .
. made of a soft elastic substance such as a soft s~nthetic :. ' ''~
.. . .
s ;:
~L~5C3 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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~L~5~8~C~
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 , - .
i~ - 13 -~ .
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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 _ ~4 -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 : . . ., :
~L051D8~0 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, - lG -~os~
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 ~056)80~
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 ~.~508~
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 ' , . : ' :, ', .. . . . :
~05C~
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 .
~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 : .
;, : . . .
~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 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 - 2~ -',' ' ' , ~ ' :
~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 ~'' . , ~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.
' ~.
.
''~
Claims (4)
1. A jointing material of a type which is preliminarily laid in place on a surface to be covered with concrete, mortar or the like, said jointing material comprising; a jointing material proper made of an elastic substance and having a pre-determined length, and a cover member formed with a pair of reference surfaces in an upper portion thereof and adapted to be fitted on said jointing material proper over a longitudinal dimension thereof; said cover member including clamping means formed with corrugations on both sides thereof, a plurality of support leg means, each of said support leg means including a pair of adjustable legs, a pair of body portions and a head portion, said body portions and said head portion connected to said legs, substantially inverted U-shaped in cross-section on the whole and adapted to be inserted into said clamping means of said cover member, whereby said plurality of support leg means may be inserted between said jointing material proper and said cover member over the longitudinal dimension thereof at predetermined intervals so as to adjust the height of said reference surfaces and stably set the whole assembly in place on said surface to be covered with concrete, mortar or the like, said head portion of said support leg means has a cross-sectional shape corresponding to the inner shape of the upper portion of said clamping means each of said body portions of said support leg means includes a projection formed by partially cutting and bending outwardly a part of said body portion, and an inner protrusion is formed on each side of said clamping means of said cover member over the longitudinal dimension thereof, whereby said support leg means is mounted between said jointing material proper and said cover member in such a manner that said projections of said body portions are received by said inner protrusions of said clamping means.
2. A jointing material of a type which is preliminarily laid in place on a surface to be covered with concrete, mortar or the like, said jointing material comprising; a jointing material proper made of an elastic substance and having a pre-determined length, and a cover member formed with a pair of reference surfaces in an upper portion thereof and adapted to be fitted on said jointing material proper over a longitudinal dimension thereof said cover member including clamping means formed with corrugations on both sides thereof, said cover is substantially inverse U-shaped in cross-section, said reference surfaces are provided on the sides of an upper surface of said clamping means over the longitudinal dimension thereof, and the central portion of said upper surface between said reference surfaces is formed into a wide V-shaped surface, a plurality of support leg means each of said support leg means including a pair of adjustable legs, a pair of body portions and a head portion, said body portions and said head portion connected to said legs, substantially inverted U-shaped in cross-section on the whole and adapted to be inserted into said clamping means of said cover member, whereby said plurality of support leg means may be inserted between said jointing material proper and said cover member over the longitudinal dimension thereof at predetermined intervals so as to adjust the height of said reference surfaces and stably set the whole assembly in place on said surface to be covered with concrete, mortar or the like, said head portion of said support leg means has a cross-sectional shape corresponding to the inner shape of the upper portion of said clamping means each of said body portions of said support leg means includes a projection formed by partially cutting and bending outwardly a part of said body portion, and an inner protrusion is formed on each side of said clamping means of said cover member over the longitudinal dimension thereof, whereby said support leg means is mounted between said jointing material proper and said cover member in such a manner that said projections of said body portions are received by said inner protrusions of said clamping means.
3. A jointing material according to claim 1, wherein said projections are fitted in and received by a pair of inner grooves provided on the sides of said clamping means of said cover member over the longitudinal dimension thereof.
4. A jointing material according to claim 2, wherein said projections are fitted in and received by a pair of inner grooves provided on the sides of said clamping means of said cover member over the longitudinal dimension thereof.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9268474U JPS5326846Y2 (en) | 1974-08-02 | 1974-08-02 | |
| JP1974143555U JPS5420187Y2 (en) | 1974-11-26 | 1974-11-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1050800A true CA1050800A (en) | 1979-03-20 |
Family
ID=26434067
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA232,467A Expired CA1050800A (en) | 1974-08-02 | 1975-07-29 | Expansion jointing material for placing concrete, mortar or the like |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1050800A (en) |
-
1975
- 1975-07-29 CA CA232,467A patent/CA1050800A/en not_active Expired
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