CA2108336A1 - Mold and method of making same - Google Patents
Mold and method of making sameInfo
- Publication number
- CA2108336A1 CA2108336A1 CA 2108336 CA2108336A CA2108336A1 CA 2108336 A1 CA2108336 A1 CA 2108336A1 CA 2108336 CA2108336 CA 2108336 CA 2108336 A CA2108336 A CA 2108336A CA 2108336 A1 CA2108336 A1 CA 2108336A1
- Authority
- CA
- Canada
- Prior art keywords
- tubular
- reinforcing elements
- cardboard
- mold
- molding element
- 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.)
- Abandoned
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 7
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 31
- 238000000465 moulding Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 12
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000000853 adhesive Substances 0.000 claims description 5
- 230000001070 adhesive effect Effects 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000004026 adhesive bonding Methods 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 239000012779 reinforcing material Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 239000000047 product Substances 0.000 description 3
- 239000010410 layer Substances 0.000 description 2
- 239000011265 semifinished product Substances 0.000 description 2
- 241000905957 Channa melasoma Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G13/00—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills
- E04G13/02—Falsework, forms, or shutterings for particular parts of buildings, e.g. stairs, steps, cornices, balconies foundations, sills for columns or like pillars; Special tying or clamping means therefor
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Making Paper Articles (AREA)
Abstract
Abstract The invention relates to a mold comprising a tubular molding element (1) with flat walls which define a prism having a polygonal cross section corresponding to that of the molded end product, and reinforcing elements (4a-4d) which cover the outer surfaces of said tubular molding element. The mold is characterized in that said reinforcing elements (4a-4d) are kept secured to the tubular element by a helical encasement wound with at least one band (8) of a material which is at least partially glued on at least one of its surfaces.
The invention also relates to a method of manufacture which recommends a straight-wound encasement with a wide band or a spiral encasement wound with a narrow band, in particular by means of a winding mandrel (5).
The invention also relates to a method of manufacture which recommends a straight-wound encasement with a wide band or a spiral encasement wound with a narrow band, in particular by means of a winding mandrel (5).
Description
NOLD NET~OD OP NARING 8ANE
Molds for making posts and pillars of cast concrete have been constructed for a long time with the aid of wood and/or metallic components.
A different technique has however been devised to construct the molds in a manner much less costly, ready for use, and generally only usable one time, which represents at a construction site numerous advantages, in particular because they are easy and fast to use.
In accordance with the technique described in particular in French Patent 1,513,315, use is largely made of cardboard.
U.S. Patent 3,301,926, or also French Applications 2,606,813 and 2,616,469 describe likewise a mold of the same type, i.e, with a tubular molding element, the rlat walls of which define an inscribable cross section corresponding to the cross section of the molded end product, a cardboard support tube with a circular cro~ section which surrounds the exterior -ction o~ th- tubular molding element, and bolster elements arranged in the spaces between the outer ur~ace~ Or this tubular molding element and the inner ~urrace Or the support tube.
For the purpo~e of having a good resistance, - 25 it is obviously desirable to devise the bolster elements with a good crushing strength.
-~` 2108~36 It has further been devised in French Patent 2,628,465 to equip a mold with an outer tube, the cross section of which is no longer circular, but quadrilateral.
In the above patents 1,513,315 and 2,628,465 it is recommended to fill the free spaces between the tubular molding element and the support tube in particular with polystyrene. On the other hand, U.S.
Patent 3,301,926 describes a method of injecting a material of this kind.
However, these bolster products are very polluting in view of the fact that after use the mold i8 destroyed by cutting the support tube.
The above French Applications 2,606,813 and 2,616,469 provide for different bolsters, in particular of cardboard, in different shapes (tubes, folded cardboard, ...).
However, as regards the foregoing injection technique, the spaces between the tubular molding element and the support tube are not completely filled, 80 that the tubular molding element is not completely supported on a homogeneous material.
All the foregoing techniques require the use of a tubular molding element and a support tube of cardboard, between which bolster elements are arranged, the generally circular support tube appearing to be necessary to ensure a good resistance to inside pressure.
The inventors are credited for reconsidering ntirely the technique and for devising a mold which is ea~y to make and has a good resistance to inner pr ~sur-.
A mold in accordance with the invention comprises in known manner a tubular molding element with flat walls defining a prism, the polygonal cross oction of which corresponds to that of the molded end product, and reinforcing element~ which overlie the outer surfaces of said tubular molding element, and it is remarkable in that said reinforcinq elements are affixed to the tubular element by an encasement of at least one band of a material which is at least partially glued on at least one of its surfaces. The encasing with bands may occur in different ways, as is described below in more detail with reference to the method.
In a mold in accordance with the invention, it i8 understood that, as regards previous techniques, an outer support tube is no longer present.
According to an optional embodiment, each reinforcing elements has a prismatic shape with a cross section of a triangle or trapezoid, the dimensions of their base line corresponding to those of the outer surface of the tubular element, to which it is applied, and the angles at the base being selected such that two adjacent side surfaces of two successive reinforcing elements are substantially coplanar.
In the case of trapezoidal reinforcing - elements, the outer covering forms a prismatic casing with 2n surfaces, n being the number of sides of the polygonal cross section of the tubular element, without counting the possible bevels arranged on its edges.
In the case of a tubular element with a polygonal cross section, all apex angles of which are identical, it suffices that the cross section of the reinforcing elements has the shape of an isosceles triangle or trapezoid with the angles at the base being each ogual to 180- divided by n.
Having in mind to provide in particular a nonpolluting and recyclable mold, which exhibits an excellent strength, the tubular molding element is made of cardboard, and the reinforcing elements are made of a honeycomb cardboard, with the edges of each honeycomb being arranged perpendicularly to the flat wall facing the tubular molding element.
2108~36 While the honeycomb card~oard has the advantage of being recyclable, and exhibits an excellent strength, other materials are naturally quite conceivable.
The invention also relates to a method of making such a mold, which is remarkable and includes the steps of:
a) forming a prismatic tubular molding element, the cross section of which corresponds to that of the molded end product;
b) cutting a reinforcing material into several elements, each having a surface with dimensions similar to the dimensions of one of the main surfaces of the prismatic tubular molding element;
c) placing the prismatic tubular element on a winding mandrel:
d) arranging the reinforcing elements on corresponding flat outer surfaces of the tubular element; and e) encasing the assembly with the aid of at least one band which is at least partially glued on least one of its surfaces.
According to one embodiment, the prismatic tubular element iB made from a sheet of a possibly grooved cardboard to form bevelled edges, and the ~urrace o~ which destined to form the interior of the mold i- treated to make it impervious. According to on- method of manufacture, the encasement is applied by ~traight winding several wraps of at least one cardboard band, whose width corresponds to the length o~ the assembly to be encased.
In a variant, however, the encasement is accomplished by means of at least one cardboard band of -- 2108~35 a narrow width with respect to the length of the assembly to be encased, which is wound helically by spiralling.
The last band used for the encasement, may further be provided on at least its outer surface with a treatment to make it impervious so as to form a final impermeable coating, it being possible to mark the latter with advertisements and/or explanatory directions for use.
Preferably, the reinforcing elements are made from a sheet of honeycomb cardboard.
To devise a mold of the above-described Xind with prismatic reinforcing elements in triangular or trapezoidal form, said elements are therefore cut from, for example, a sheet of an adequate material.
Advantageously, the reinforcing elements are kept in position on the flat outside surfaces of the tubular element before encasing by gluing and/or securing with adhesive strips.
The invention will be better understood and further characteristics will become apparent when reading the following description with reference to the attached drawings, in which:
Figures 1 and 2 show respectively in profile and in perspective view a sheet of cardboard before folding, which is intended to form the tubular molding element;
Figure 3 is a perspective view of a quasi finished tubular molding element;
Figure 4 shows in profile a sheet of honeycomb cardboard precut to form the reinforcing lement~s Figure~ 5-7 show three successive stages of the manu~acture according to a first method, the tubular element being arranged on a winding mandril;
Figure 8 shows the finished product obtained after the manufacturing stages of Figures 5-7; and 2108~6 Figures g and 10 correspond to Figures 7 and 8 in accordance with a second method of manufacture.
To make a mold in accordance with the invention, a prismatic tubular element is first formed from a sheet 1 of, for example, a cardboard 3 (Figures 1-3, and 5).
In the illustrated example, the prismatic tubular element 1 as formed (Figures 3 and 5) has a substantially square cross section (the same reference numeral 1 i9 used to designate equally the tubular element or the sheet from which the former is made).
To accomplish this, the sheet of cardboard 1 (Figures 1 and 2) is grooved as shown in said Figures (by arrows in Figure 1 and dotted lines in Figure 2), to divide the sheet 1 in four main portions la-ld intended to form the four walls of the prism (Figure 3) after folding along the thus-formed grooves.
In fact, as can be seen in the Figures, the grooves, except an end groove, are double grooves so as to form bevelled edges 2a-2d (Figure 3).
The tubular element 1 is closed, for example, by means of an adhesive band 3 (Figure 5), or a different means, which is here placed lengthwise between a main surface la and a bevel 2d.
The thus-formed prismatic tubular element 1 should further have the desired dimensions of the molded end product.
A sheet of honeycomb cardboard 4 (Figure 4) i~ cut, as shown in Figure 4, into several elements, ~uch as ~a-~f.
In the illustrated example, each element ~a-4f has a prismatic shape with a trapezoidal cross ~ection, and more particularly in the form of an isosceles trapezoid, whose angles at the base line are 45-.
Noreover, the base lines of each pri~matic trapezial element have dimensions corresponding to 210833fi those of the surfaces la-ld of tubular element 1. It is understood that a cut as shown in Figure 4 (at 45 in alternating fashion), allows to considerably limit discards, which constitutes a particularly economical technique.
Finally, the surface of sheet 1 which is to form the inside surface of said tubular element is treated to make it impervious.
The prismatic tubular element 1 is then placed on a mandrel 5 (Figure 5), the cross section of which corresponds to the inside cross section of said element 1 (bavels included), the latter being closed lengthwise by adhesive band 3, before or after it is positioned on said mandrel 5.
As is shown in Figures 5-7 and 9, the mandrel 5 is expansible with the aid of, for examples, followers 6a-6d (Figure 5) which are capable of spreading from the axis of said mandril by all hydraulic and/or pneumatic and/or electric means.
After the tubular element is placed on the mandrel, the reinforcing elements 4a-~d are positioned, as shown in Figure 6, in that the base lines of said elements are applied to the surfaces of element 1.
As best seen in Figures 6-10, the dimensions of said reinforcing elements 4a-~d are such (base anqles 45-) that two adjacent lateral surfaces of two ~uccessive reinforcing elements are substantially coplanar.
The reinforcing elements ~a-4d are held by glulng their ~urraces which are in contact with tubular lement 1 and/or by securing them with adhesive strips, such as 7a-7d in Fiqures 6, 7, and 9.
The next operation consists of applying an ~ncasement as shown in Fiqures 7 and 9.
The as~embly shown in Fiqure 6 is encased in that the mandrel 5 is rotated and at least one cardboard band 8, 8~ is wound. Shown in Figure 7 is an 2108~36 encasement by spiralling, namely, by helical winding a band 8.
Advantageously, the spiral winding is performed in several layers and, possibly, by crossed layers with the aid of at least one band which is at least partially glued on at least one of its surfaces (not to say its two surfaces~. In this case, the band 8 as used has clearly a relatively narrow width with respect to the semifinished product.
However, as shown in Figure 9, is it also possible to perform a straight winding of at least one band 8' wound in several wraps, said band having in this instance a width corresponding to the length of the semifinished product.
In this manner, a finished product is obtained (after removal of the mandrel), such as is shown in Figures 8 and lO, namely the wound band forms an outer casing here in the shape of an octagon (regular or irregular in accordance with the selected thickness of the reinforcing elements).
It is however clear, that the reinforcing elements could also be triangular in shape, the resultant casing having then a square cross section.
Furthermore, while the illustrated tubular element 1 has here a substantially square cross section, it is a special case of a rectangular cross section and in a more general manner, said cross section i8 polygonal, be it regular or not.
Whilo the cross section of the tubular molding element can thus be generalized, that of the reinforcing element~ may also be other than in the form of a trapezoid or tr~angle, such as, for example, a circular segment.
Furthermore, it i8 not necessary that the ad~acent lat-ral surfaces of the reinforcing elements be coplanar.
g Finally, of course, the finishes may and/or should be provided as a final web of an impermeable casing (possibly over a single wrap in the case of straight winding, and over a single layer in the case of spiral winding), as a sealing treatment of the ends, the impressions on the outer surface of the final band, etc.
Such a mold allows to withstand in a surprising manner great stress, which is clearly desired for the molding of concrete posts or pillars.
Molds for making posts and pillars of cast concrete have been constructed for a long time with the aid of wood and/or metallic components.
A different technique has however been devised to construct the molds in a manner much less costly, ready for use, and generally only usable one time, which represents at a construction site numerous advantages, in particular because they are easy and fast to use.
In accordance with the technique described in particular in French Patent 1,513,315, use is largely made of cardboard.
U.S. Patent 3,301,926, or also French Applications 2,606,813 and 2,616,469 describe likewise a mold of the same type, i.e, with a tubular molding element, the rlat walls of which define an inscribable cross section corresponding to the cross section of the molded end product, a cardboard support tube with a circular cro~ section which surrounds the exterior -ction o~ th- tubular molding element, and bolster elements arranged in the spaces between the outer ur~ace~ Or this tubular molding element and the inner ~urrace Or the support tube.
For the purpo~e of having a good resistance, - 25 it is obviously desirable to devise the bolster elements with a good crushing strength.
-~` 2108~36 It has further been devised in French Patent 2,628,465 to equip a mold with an outer tube, the cross section of which is no longer circular, but quadrilateral.
In the above patents 1,513,315 and 2,628,465 it is recommended to fill the free spaces between the tubular molding element and the support tube in particular with polystyrene. On the other hand, U.S.
Patent 3,301,926 describes a method of injecting a material of this kind.
However, these bolster products are very polluting in view of the fact that after use the mold i8 destroyed by cutting the support tube.
The above French Applications 2,606,813 and 2,616,469 provide for different bolsters, in particular of cardboard, in different shapes (tubes, folded cardboard, ...).
However, as regards the foregoing injection technique, the spaces between the tubular molding element and the support tube are not completely filled, 80 that the tubular molding element is not completely supported on a homogeneous material.
All the foregoing techniques require the use of a tubular molding element and a support tube of cardboard, between which bolster elements are arranged, the generally circular support tube appearing to be necessary to ensure a good resistance to inside pressure.
The inventors are credited for reconsidering ntirely the technique and for devising a mold which is ea~y to make and has a good resistance to inner pr ~sur-.
A mold in accordance with the invention comprises in known manner a tubular molding element with flat walls defining a prism, the polygonal cross oction of which corresponds to that of the molded end product, and reinforcing element~ which overlie the outer surfaces of said tubular molding element, and it is remarkable in that said reinforcinq elements are affixed to the tubular element by an encasement of at least one band of a material which is at least partially glued on at least one of its surfaces. The encasing with bands may occur in different ways, as is described below in more detail with reference to the method.
In a mold in accordance with the invention, it i8 understood that, as regards previous techniques, an outer support tube is no longer present.
According to an optional embodiment, each reinforcing elements has a prismatic shape with a cross section of a triangle or trapezoid, the dimensions of their base line corresponding to those of the outer surface of the tubular element, to which it is applied, and the angles at the base being selected such that two adjacent side surfaces of two successive reinforcing elements are substantially coplanar.
In the case of trapezoidal reinforcing - elements, the outer covering forms a prismatic casing with 2n surfaces, n being the number of sides of the polygonal cross section of the tubular element, without counting the possible bevels arranged on its edges.
In the case of a tubular element with a polygonal cross section, all apex angles of which are identical, it suffices that the cross section of the reinforcing elements has the shape of an isosceles triangle or trapezoid with the angles at the base being each ogual to 180- divided by n.
Having in mind to provide in particular a nonpolluting and recyclable mold, which exhibits an excellent strength, the tubular molding element is made of cardboard, and the reinforcing elements are made of a honeycomb cardboard, with the edges of each honeycomb being arranged perpendicularly to the flat wall facing the tubular molding element.
2108~36 While the honeycomb card~oard has the advantage of being recyclable, and exhibits an excellent strength, other materials are naturally quite conceivable.
The invention also relates to a method of making such a mold, which is remarkable and includes the steps of:
a) forming a prismatic tubular molding element, the cross section of which corresponds to that of the molded end product;
b) cutting a reinforcing material into several elements, each having a surface with dimensions similar to the dimensions of one of the main surfaces of the prismatic tubular molding element;
c) placing the prismatic tubular element on a winding mandrel:
d) arranging the reinforcing elements on corresponding flat outer surfaces of the tubular element; and e) encasing the assembly with the aid of at least one band which is at least partially glued on least one of its surfaces.
According to one embodiment, the prismatic tubular element iB made from a sheet of a possibly grooved cardboard to form bevelled edges, and the ~urrace o~ which destined to form the interior of the mold i- treated to make it impervious. According to on- method of manufacture, the encasement is applied by ~traight winding several wraps of at least one cardboard band, whose width corresponds to the length o~ the assembly to be encased.
In a variant, however, the encasement is accomplished by means of at least one cardboard band of -- 2108~35 a narrow width with respect to the length of the assembly to be encased, which is wound helically by spiralling.
The last band used for the encasement, may further be provided on at least its outer surface with a treatment to make it impervious so as to form a final impermeable coating, it being possible to mark the latter with advertisements and/or explanatory directions for use.
Preferably, the reinforcing elements are made from a sheet of honeycomb cardboard.
To devise a mold of the above-described Xind with prismatic reinforcing elements in triangular or trapezoidal form, said elements are therefore cut from, for example, a sheet of an adequate material.
Advantageously, the reinforcing elements are kept in position on the flat outside surfaces of the tubular element before encasing by gluing and/or securing with adhesive strips.
The invention will be better understood and further characteristics will become apparent when reading the following description with reference to the attached drawings, in which:
Figures 1 and 2 show respectively in profile and in perspective view a sheet of cardboard before folding, which is intended to form the tubular molding element;
Figure 3 is a perspective view of a quasi finished tubular molding element;
Figure 4 shows in profile a sheet of honeycomb cardboard precut to form the reinforcing lement~s Figure~ 5-7 show three successive stages of the manu~acture according to a first method, the tubular element being arranged on a winding mandril;
Figure 8 shows the finished product obtained after the manufacturing stages of Figures 5-7; and 2108~6 Figures g and 10 correspond to Figures 7 and 8 in accordance with a second method of manufacture.
To make a mold in accordance with the invention, a prismatic tubular element is first formed from a sheet 1 of, for example, a cardboard 3 (Figures 1-3, and 5).
In the illustrated example, the prismatic tubular element 1 as formed (Figures 3 and 5) has a substantially square cross section (the same reference numeral 1 i9 used to designate equally the tubular element or the sheet from which the former is made).
To accomplish this, the sheet of cardboard 1 (Figures 1 and 2) is grooved as shown in said Figures (by arrows in Figure 1 and dotted lines in Figure 2), to divide the sheet 1 in four main portions la-ld intended to form the four walls of the prism (Figure 3) after folding along the thus-formed grooves.
In fact, as can be seen in the Figures, the grooves, except an end groove, are double grooves so as to form bevelled edges 2a-2d (Figure 3).
The tubular element 1 is closed, for example, by means of an adhesive band 3 (Figure 5), or a different means, which is here placed lengthwise between a main surface la and a bevel 2d.
The thus-formed prismatic tubular element 1 should further have the desired dimensions of the molded end product.
A sheet of honeycomb cardboard 4 (Figure 4) i~ cut, as shown in Figure 4, into several elements, ~uch as ~a-~f.
In the illustrated example, each element ~a-4f has a prismatic shape with a trapezoidal cross ~ection, and more particularly in the form of an isosceles trapezoid, whose angles at the base line are 45-.
Noreover, the base lines of each pri~matic trapezial element have dimensions corresponding to 210833fi those of the surfaces la-ld of tubular element 1. It is understood that a cut as shown in Figure 4 (at 45 in alternating fashion), allows to considerably limit discards, which constitutes a particularly economical technique.
Finally, the surface of sheet 1 which is to form the inside surface of said tubular element is treated to make it impervious.
The prismatic tubular element 1 is then placed on a mandrel 5 (Figure 5), the cross section of which corresponds to the inside cross section of said element 1 (bavels included), the latter being closed lengthwise by adhesive band 3, before or after it is positioned on said mandrel 5.
As is shown in Figures 5-7 and 9, the mandrel 5 is expansible with the aid of, for examples, followers 6a-6d (Figure 5) which are capable of spreading from the axis of said mandril by all hydraulic and/or pneumatic and/or electric means.
After the tubular element is placed on the mandrel, the reinforcing elements 4a-~d are positioned, as shown in Figure 6, in that the base lines of said elements are applied to the surfaces of element 1.
As best seen in Figures 6-10, the dimensions of said reinforcing elements 4a-~d are such (base anqles 45-) that two adjacent lateral surfaces of two ~uccessive reinforcing elements are substantially coplanar.
The reinforcing elements ~a-4d are held by glulng their ~urraces which are in contact with tubular lement 1 and/or by securing them with adhesive strips, such as 7a-7d in Fiqures 6, 7, and 9.
The next operation consists of applying an ~ncasement as shown in Fiqures 7 and 9.
The as~embly shown in Fiqure 6 is encased in that the mandrel 5 is rotated and at least one cardboard band 8, 8~ is wound. Shown in Figure 7 is an 2108~36 encasement by spiralling, namely, by helical winding a band 8.
Advantageously, the spiral winding is performed in several layers and, possibly, by crossed layers with the aid of at least one band which is at least partially glued on at least one of its surfaces (not to say its two surfaces~. In this case, the band 8 as used has clearly a relatively narrow width with respect to the semifinished product.
However, as shown in Figure 9, is it also possible to perform a straight winding of at least one band 8' wound in several wraps, said band having in this instance a width corresponding to the length of the semifinished product.
In this manner, a finished product is obtained (after removal of the mandrel), such as is shown in Figures 8 and lO, namely the wound band forms an outer casing here in the shape of an octagon (regular or irregular in accordance with the selected thickness of the reinforcing elements).
It is however clear, that the reinforcing elements could also be triangular in shape, the resultant casing having then a square cross section.
Furthermore, while the illustrated tubular element 1 has here a substantially square cross section, it is a special case of a rectangular cross section and in a more general manner, said cross section i8 polygonal, be it regular or not.
Whilo the cross section of the tubular molding element can thus be generalized, that of the reinforcing element~ may also be other than in the form of a trapezoid or tr~angle, such as, for example, a circular segment.
Furthermore, it i8 not necessary that the ad~acent lat-ral surfaces of the reinforcing elements be coplanar.
g Finally, of course, the finishes may and/or should be provided as a final web of an impermeable casing (possibly over a single wrap in the case of straight winding, and over a single layer in the case of spiral winding), as a sealing treatment of the ends, the impressions on the outer surface of the final band, etc.
Such a mold allows to withstand in a surprising manner great stress, which is clearly desired for the molding of concrete posts or pillars.
Claims (11)
1. Mold comprising a tubular molding element (1) provided with flat walls (1a-1d), which define a prism with a polygonal cross section corresponding to that of the molded end product, and reinforcing elements (4a-4d) which cover the outer surfaces of said tubular molding element, characterized in that said reinforcing elements are kept in position on the tubular element by helically winding at least one band (8, 8') of a material at least partially glued on at least one of its surfaces.
2. Mold as in claim 1, characterized in that each reinforcing element has a prismatic shape with a cross section in the form of a triangle or trapezoid, the base line dimensions of which correspond to those of the outer surface (1a-1d) of tubular element (1), to which it is applied, and the base angles of which are selected such that two adjacent side surfaces of two successive reinforcing elements are substantially coplanar.
3. Mold as in one of claims 1 and 2, characterized in that the tubular molding element (1) consists of cardboard, and that the reinforcing elements (4a-4d) are made from honeycomb cardboard, the edges of each honeycomb being arranged perpendicularly to the flat wall facing the tubular molding element.
4. Method of making a cardboard mold, characterized in that it comprises the steps of:
a) forming a prismatic tubular molding element (1), the cross section of which corresponds to that of the molded end product;
b) cutting a reinforcing material (4) into several elements (4a-4d), each having a surface with dimensions similar to the dimensions of one of the main surfaces of the prismatic tubular molding element (1);
c) placing the prismatic tubular molding element (1) on a winding mandrel (5);
d) arranging the reinforcing elements (4a-4d) on the corresponding flat outer surfaces of the tubular element; and e) encasing the assembly with the aid of at least one band (8, 8') which is glued at least in part on at least one of its surfaces.
a) forming a prismatic tubular molding element (1), the cross section of which corresponds to that of the molded end product;
b) cutting a reinforcing material (4) into several elements (4a-4d), each having a surface with dimensions similar to the dimensions of one of the main surfaces of the prismatic tubular molding element (1);
c) placing the prismatic tubular molding element (1) on a winding mandrel (5);
d) arranging the reinforcing elements (4a-4d) on the corresponding flat outer surfaces of the tubular element; and e) encasing the assembly with the aid of at least one band (8, 8') which is glued at least in part on at least one of its surfaces.
5. Method as in claim 4, characterized in that the prismatic tubular molding element is made from a sheet of cardboard (1) which may be grooved so as to form bevelled edges, and whose surface destined to form the interior of the mold is treated so as to make it impermeable.
6. Method as one of claims 4-5, characterized in that the encasement is accomplished by straight winding several wraps of at least one cardboard band (8), the width of which corresponds to the length of the assembly to be encased.
7. Method as in one of claims 4-5, characterized in that the encasement is accomplished by means of at least one cardboard band (8) of a narrow width with respect to the length of the assembly to be encased, which is helically wound by spiralling.
8. Method as in one of claims 4-7, characterized in that the last band used for the encasing is provided on at least its outer surface with a sealing treatment so as to form a final impermeable coating.
9. Method as in one of claims 4-8, characterized in that the reinforcing elements (4a-4d) are made from a sheet (4) of honeycomb cardboard.
10. Method as in one of claims 4-9, characterized in that the reinforcing elements are cut such that each has a prismatic shape with a cross section of a triangle or trapezoid, the base line dimensions of which correspond to that of the outer surface (1a-1d) of tubular element (1), to which it is applied, and the base angles of which are selected such that two adjacent side surfaces of two successive reinforcing elements are substantially coplanar.
11. Method as in claims 4-10, characterized in that the reinforcing elements (4a-4d) are kept in position on the outer surfaces (1a-1d) of tubular element (1) before encasing by gluing and/or by securing with adhesives strips (7a-7d).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR92112203 | 1992-10-13 | ||
| FR9212203A FR2696772A1 (en) | 1992-10-13 | 1992-10-13 | Formwork and its manufacturing process. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2108336A1 true CA2108336A1 (en) | 1994-04-14 |
Family
ID=9434467
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2108336 Abandoned CA2108336A1 (en) | 1992-10-13 | 1993-10-13 | Mold and method of making same |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0595679A1 (en) |
| CA (1) | CA2108336A1 (en) |
| FR (1) | FR2696772A1 (en) |
| NO (1) | NO933676L (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2164037B1 (en) * | 1999-02-05 | 2002-12-01 | Salinas Jose Manuel Valero | IMPROVEMENTS IN DISPOSABLE FORMWORK FOR CYLINDRICAL COLUMNS. |
| ES2170020B1 (en) * | 2000-11-02 | 2003-03-16 | Salinas Jose Manuel Valero | FORMWORK FOR PRISMATIC OR CYLINDRICAL COLUMNS. |
| ES2246173B1 (en) * | 2004-07-30 | 2006-10-01 | Jose Manuel Valero, S.L. | REUSABLE FORMWORK FOR COLUMNS AND MACHINE FOR THE ELABORATION OF THE SAME. |
| ES2315168B1 (en) * | 2007-04-20 | 2010-01-05 | Procoro Del Real Lopez | FOLDING FORMWORK FOR OBTAINING SQUARE SECTION PILLARS. |
| US7874540B2 (en) | 2007-06-27 | 2011-01-25 | Sonoco Development, Inc. | Concrete form for pouring non-round columns, and method of making same |
| US9376826B2 (en) * | 2011-08-09 | 2016-06-28 | D & L Innovations, Inc. | Form sleeve for forming concrete footings |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB913032A (en) * | 1961-06-24 | 1962-12-12 | Sonoco Products Co | Improvements in forms for moulding concrete columns |
| US3301926A (en) * | 1964-04-08 | 1967-01-31 | Gateway Erectors Inc | Method of fabricating a self-braced concrete form |
| FR1513315A (en) * | 1966-09-20 | 1968-02-16 | Cardboard formwork for columns or any other piece of circular or polygonal section | |
| DE3273616D1 (en) * | 1981-06-26 | 1986-11-13 | Quinton & Kaines Holdings | Composite boards and panels |
| IT1223094B (en) * | 1986-11-14 | 1990-09-12 | Sofratube R C T S A | TUBULAR MOLD FOR A NON-CIRCULAR SECTION ELEMENT OR RECTILINEAR SECTION, IN PARTICULAR FOR THE CONCRETE COATING |
| FR2628465B1 (en) * | 1988-03-14 | 1993-08-20 | Servoz Gavin Maurice | CONSUMABLE FORMWORK |
| DE9014214U1 (en) * | 1990-10-12 | 1991-01-10 | Construmat Ag, Hegnau-Volketswil | Formwork element for concrete columns |
-
1992
- 1992-10-13 FR FR9212203A patent/FR2696772A1/en active Pending
-
1993
- 1993-10-12 NO NO933676A patent/NO933676L/en unknown
- 1993-10-13 CA CA 2108336 patent/CA2108336A1/en not_active Abandoned
- 1993-10-13 EP EP93402520A patent/EP0595679A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FR2696772A1 (en) | 1994-04-15 |
| NO933676D0 (en) | 1993-10-12 |
| NO933676L (en) | 1994-04-14 |
| EP0595679A1 (en) | 1994-05-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |