(19)
(11)EP 1 878 853 A1

(12)EUROPEAN PATENT APPLICATION

(43)Date of publication:
16.01.2008 Bulletin 2008/03

(21)Application number: 06425413.9

(22)Date of filing:  19.06.2006
(51)Int. Cl.: 
E04G 17/07  (2006.01)
(84)Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(71)Applicant: Patents Production srl
50051 Castelfiorentino (FI) (IT)

(72)Inventors:
  • Giannoni, Oreste
    50053 Empoli (FI) (IT)
  • Paolucci, Gino
    56038 Bientina (PI) (IT)

(74)Representative: Turini, Laura 
Studio Legale Turini Via Lamarmora 55
50121 Florence (FI)
50121 Florence (FI) (IT)

  


(54)Plastic support with metal core for vertically holding the posts of the boards of a shell for masonry


(57) Support for fixing the posts of the boards of a shell for the construction of concrete masonry, realized in plastic by pressure casting and including a metal core (5) reinforcing at least one part of it. In particular, this reinforcement (5) is only present on the final portion (6) of said support, where a wedge (12) fits for blocking the boards (18), since this portion (6) is the one that suffers greater pressure due to the applied loads.




Description

Technical Field



[0001] The present invention concerns the technical sector relative to the production of tools for structural construction and similar, necessary for the preparation of reinforced concrete laying making foundations, brick walls, footings and/or bearers or vertical beams.

[0002] In particular, this invention relates to a flat tool, called "hoop", which is placed horizontally between the boards placed in vertical position to contain the concrete laying. This tool is fastened outside said boards by means of suitable wedges.

Background Art



[0003] Different methods are used for the realization of concrete laying, no matter if they are going to make foundations or bearers, as well as brick walls, footings or other structures.

[0004] In brief, the current constructive technique can be described according to the following phases: possible preparation of the excavation; arrangement of the iron cage; placing of the timbering (so-called shell); concrete laying; removal of the timbering. Some construction methods proceed first with the timbering and later with the insertion of the iron cage, so making the process of correct shell more difficult.

[0005] The operation to make the shell is very important, because for a good result of the work, it's necessary to get a correct alignment of the panels or boards for the foundation beam and especially for the bearers and the brick walls.

[0006] The wooden boards, or the panels, must be fixed to the ground and often placed vertically one over the other, in order to cover greater heights than the height of the same board, which is obviously not bulky otherwise its shape and weight would prevent its easy utilisation by the workers.

[0007] In addition, the boards are externally supported by posts consisting of iron sheets provided with holes into which the "hoops" horizontally fit, said hoops consisting in their turn of iron sheets that are later fixed outside the post by means of wedges.

[0008] Said hoops, according to the prior art, are horizontally applied so as to cover the gap between one board and the opposite board of a shell. Said hoops extend out of the two boards and in the extension point fit into the hole of the opposite posts that make the end of the hoop come out. Said end of the hoop has a hole into which a wedge fits in order to keep the post still connected to the board.

[0009] Firstly, concrete is laid inside the shell, then we remove the wedge, the posts and the wooden boards, finally the iron parts of the hoops remain in extension from the concrete construction. In order to eliminate these extensions, we repeatedly bend the sheet breaking it in the point of contact with the concrete that, due to this bending, wears near the same hoop requiring then to apply the stucco on the damaged part.

[0010] The fact the hoops are made of iron involves relevant drawbacks.

[0011] The fact they are made of iron makes these tools, or hoops, heavy, therefore difficult to handle, slowing down the labour as workers cannot use many of them and need break times. In addition, the workers handling the iron may risk cutting and injuring, also for this reason they must use the existing tools with great care and attention. Another drawback, the most relevant from the constructive point of view, is the risk of rust, in particular in the external portions where the hoops extend, which entails continuous adjustments by the workers. A further drawback is that in time the iron hoops corrode until they create a gap inside the laid structure, facilitating in fact the infiltration of water and moisture.

Disclosure of invention



[0012] The present invention aims at avoiding the above-mentioned and other drawbacks, supplying a support for vertically holding the posts of the boards for the construction of a shell for the laying of masonry, having the characteristics described in the independent claims. Other characteristics of this invention are the object of dependent claims.

[0013] The advantages resulting from the present invention essentially consist of the fact that the weight of these tools, or hoops, supporting the posts of the boards of a shell, is reduced, so they are easiest to handle with less effort, consequently reducing the labour; that there is no risk of rust, with consequent reduction of the risk of damages to people handling these supports during the construction of the shell; that there is no risk of rust inside the support and no risk of rust even outside in the point of extension of the support where it must be broken to be separated from the body of factory; that this invention owns such a characteristic of mechanical resistance that it wholly fulfils the load needs the object must bear both during construction and for containing the laying; that, being equipped with seals inside the laying, placed close to the external line of the wall, there is no risk that moisture penetrates inside the support, due to contact and infiltration on the final portions.

[0014] Reduced to its essential structure and with reference to the figures of the enclosed drawings, a support for holding the opposite posts of the boards and/or just the boards without the posts, forming the shell for the construction of concrete masonry, according to the present invention, comprises a longitudinal element (1) having at least one end (6), preferably both ends, with hole (7) for the insertion of a wedge, characterized in that this support is made of plastic material and includes a metal core (5), or reinforcement, on at least part of the length of the same support.

[0015] Said support consists of a longitudinal element (1) proportionally as long as the space between the opposite boards (18) of a shell, so that its opposite ends (6) extend outside said boards for a length (6) that enters the hole on the posts (23) and further extends to permit the insertion of a wedge (14) in the hole (7) made on the extending portion of the same posts, so as to steady fix the posts to the boards.

[0016] Said support consists of a longitudinal element (1) proportionally as long as the space between the opposite boards (18) of a shell, so that its opposite ends (6) extend outside said boards for a length (6), where a wedge (14), inserted into the hole (7), steady fixes the boards.

[0017] Said support is made of plastic and includes a metal reinforcement, or core, which improves the hold to the support and/or to the hole for the wedge.

[0018] Said support is realized by plastic pressure casting, with thin metal core dipped inside. The fact it's made of plastic ensures a greater lightness compared with the iron supports currently used and thus allows the worker to assemble the shell more rapidly and with less effort. The use of plastic, instead of iron, also avoids any risk of cuts to the worker, as the metal portion is entirely dipped inside, and avoids the rust, particularly dangerous for the persons who must handle these tools many times during the day. The rust is also dangerous for the structure in construction because it may wear in the breaking points of the traditional hoops.

[0019] The different material is particularly innovative, as in the field of masonry all the accessories are made of iron.

[0020] The extension (6) of the support has a hole (7) where a wedge enters, crossing also the hole of the post, therefore fixing the post to the board.

[0021] Conveniently, said metal core is only present on the extension (6) of the support. This metal core may be applied even outside the extension (6) provided that it's connected to it by suitable means. This condition does not alter the advantages of the invention, since the extension (6) is however cut off once the support is completed, therefore the iron is anyway eliminated even if outside the hoop.

[0022] Conveniently, said metal core is dipped into the plastic only inside the extension (6).

[0023] Said support has two couples of props (3) consisting of two extensions, one over and one under the surface (1) of the support, which represent the stop point of the board and at the same time hold the same board during assembling. These couples of props (3) can take any shape, either orthogonal or sloping to the same support, and represent the stop points of the board resting on them.

[0024] Fig. 4 clearly illustrates their function showing the board (18) rested against these props (3). Once the shell is removed, and therefore the board (18) eliminated, these props (3) remain dipped into the concrete laying and cannot be seen from the outside. Even in the phase of cutting the final portion (6) of the support, these props (3) have the function to prevent any damage to the same structure due to the bending and cutting of the extension (6), as they can resist to the pressure exerted on the extension (6), avoiding any damage to the support in that point.

[0025] Said support comprises at least one final portion (6), preferably both, which includes inside a metal reinforcement, or core (5). This metal core is realized by pressure casting during the manufacturing of the piece and remains dipped inside so that it does not extend outside. Which allows the worker to use the hoop without any risk and with all the advantages of lightness typical of a plastic tool.

[0026] This core (5) arrives until the point of the props (3) or slightly inside them (see the section of Fig. 1), so that when the final portion (6) including the core (5) is cut off, the entire metal core comes out and is eliminated from the rest of the support together with the final portion (6).

[0027] Consequently, with reference to Fig. 5, the portion that remains dipped inside the concrete laying, formed by the central body (1) and the props (3), is made of plastic and has no internal iron reinforcement. In this way, there is no risk of rust or wear and tear. The plastic element contained in the laying does not alter the construction, but rather gives it more lightness and stability.

[0028] All that is particularly advantageous. As a matter of fact, the iron reinforcement is necessary on the extension (6), since the wedge (14) presses on it, therefore this portion suffers such a greater pressure that a final portion made of plastic only might not bear. On the contrary, the internal reinforcement allows this portion to resist to this pressure and therefore carry out a perfect function, as well as or even better than a traditional iron hoop, but without losing the above-mentioned advantages of lightness and absence of rust. There will be no rust because, once the shell is removed, the iron is completely eliminated and no trace remains in the construction.

[0029] Thus, workers can handle light hoops with less effort, accelerating the labour times, and at the same time they have the guarantee of hold of said supports during laying as well as or even more than traditional systems.

[0030] This metal core is realized so that it is eliminated together with the final portion (6), therefore only the plastic portion remains inside the construction, with all the advantages of a plastic hoop without any iron element.

[0031] Said core is preferably made of steel.

[0032] Said core has a rectangular section and reduced thickness, it includes a hole (7) where no plastic material is injected during manufacturing. In practice, the metal core reproduces the shape of the final portion (6) and includes a corresponding hole necessary for the insertion of the wedge (14). In this way, the final portion (6) is made of iron, but this iron cannot be seen from the outside and in any case is eliminated when the portion (6) is cut off, once the concrete laying is completed.

[0033] Said core comprises a triangular sector (10), which is partially filled except for a passing hole (4) that can be used to fix the board below by means of nails.

[0034] Said metal core comprises a series of holes (8) aimed at permitting the passage and therefore the total filling of the plastic material in pressure casting, making the same core extremely connected with the plastic hoop, so forming an indivisible single body.

[0035] Said metal core extends for 1 or 2 mm beyond the prop (3) for resting the board, in order to avoid irregular breaks when the laying is completed and the extension (6) cut off, which cause residual projections of the hoop from the external line of the laying.

[0036] Conveniently, this support, or hoop, comprises on at least one extension (6), preferably on both extensions, in the immediate section inside the resting point (3) of the board, a notch (19) for the insertion of a rubber seal (20) (like O-Ring and similar). This manufacturing detail permits to isolate the concrete support from possible infiltrations of water, as the same ring (20) covers possible gaps that might occur between hoop and material of laying. Also in this case, the final portion (6) includes a metal core inside.

[0037] Conveniently, this support, or hoop, comprises on at least one extension (6), preferably on both extensions, in the immediate section inside the point (3), a seal (20) in rubber or other similar material, connected to the same support.

[0038] Conveniently, this support, or hoop, comprises on at least one extension (6), preferably on both extensions, in the immediate section inside the point (3), a seal (20) in plastic realized by the same pressure casting used for the support.

[0039] Conveniently, this support comprises one or more seals (20) placed at one or more of its ends, which remain dipped inside the concrete laying forming the masonry. Said seals consist of a ring OR that is inserted in the desired point of the hoop.

[0040] Conveniently, the hoops comprise near the breaking point, but in the internal part of the hoop, a circular notch (19) into which said seal fits.

[0041] In order to avoid the infiltration of water in the gaps that occur in the breaking portion of the extension of the hoop from the laying, this invention comprises one or more rubber rings OR inserted into suitable notches (19) on the same hoop (1) near the cutting point.

[0042] The hoop realized as above described is in plastic. The seal is in rubber or other similar material.

[0043] Conveniently, in an alternative solution, this support comprises a metal core (5) that longitudinally crosses the entire body of the hoop. In this case, once the final part (6) is cut off, the iron core remains inside the hoop, therefore the advantages offered by the utilisation of the only plastic are partially lost, consequently this solution is less advantageous while the previous one is preferable. Nevertheless, also this solution however permits to use lighter supports, or hoops, than the traditional ones totally made of iron, and has still the advantage that the worker never directly touches the iron that remains inside the hoop. Obviously, once the final portion (6) is cut off, the metal part always remains inside the plastic, which might cause, even if in reduced measure compared to the traditional systems, problems of rust, therefore in this case it's necessary to properly plug or fill the breaking portion.

[0044] The general manufacturing concept remains unchanged, both as regards the hole (7), the residual hole (4) passing through the triangular opening (10) of the core, and the several holes (8) for the stable assembling metal core/plastic covering.

[0045] In order to cut the extensions (6), after the laying is completed, a structural weakening of the material (15) crosses the metal core.

[0046] During the removing phase, the wedge is removed from the hole (7), the board is raised from the resting portion and the support is broken in the final point of the metal core (16).

[0047] Conveniently, this point, in the case of continuous core, can consist of a transverse micro-perforated line (15), or however weakened, so as to permit an easier breaking.

[0048] Conveniently, the adoption of the metal core, either reduced to the two ends pressed by the action of the wedge, or included inside the entire length of the piece, allows the hole (7), deeply pressed by the hits exerted on the wedge (12) inserted, to perfectly resist, without releasing on contrast edges that would make the hole oval so making the pressure of the wedge not affecting the board and therefore the system not precise in its function.

[0049] The fact this invention is realized in plastic offers considerable advantages also in removing phase. As a matter of fact, the plastic breaks more easily and precisely in the breaking point, properly following the weakening in the core, thus avoiding any possible residual piece of material outside. In addition, as this invention is made of plastic, the risks of accidents, scratches or injuries to the workers are reduced to the minimum, while the risk of rust is completely eliminated, with consequent advantages from the point of view of security on job and good result of the work. After the breaking of the external part of the piece, there will be no rust in the breaking point and therefore the support will be finished with no need of further works.

[0050] In practice, the manufacturing details may however vary as regards shape, size, position of elements and type of materials used, but still remain within the range of the idea proposed as a solution and consequently within the limits of the protection granted by this patent for invention.

Brief description of drawings



[0051] The advantages of the present invention will be better understood by every expert in this field by referring to the enclosed drawings, given as practical examples of the invention but not to be considered restrictive.

[0052] Fig. 1 shows the present invention forming the support for holding two opposite posts of the boards of a shell. This invention is composed by a central long body (1) comprising inside several reinforcing ribs (2) and at the two ends two symmetrical extensions, one above and one below (3), which are the resting point of the board of the shell. This invention comprises at least one end (6) that extends outside the board (18), crosses the hole of the post (23) and comes out from it, so that the hole (7) results outside the post. Inside the hole (7) the wedge (14) is inserted, with its long part (13) that enters the hole and the upper part that makes the handle (14) used as contrast surface for fitting by hammer the wedge (12) into the hole (7), so placing the vertical surface (22) of the wedge in pressure on the board. This final portion (6) includes a metal core (5) inside, which is realized by pressure casting during the manufacturing of the piece. Said core, made of steel, having rectangular section and reduced thickness (Fig. 1 and relative sections) comprises a correspondent hole (7) where no plastic material is injected during manufacturing, as well as the triangular sector (10) of the metal core, which will be partially filled except for a passing hole (4) that can be used to fix the board below by means of nails. In addition, the metal core comprises a further series of holes (8) aimed at permitting the passage and therefore the total filling of the plastic material in pressure casting, making the same core extremely connected with the plastic hoop, so forming an indivisible single body. This metal core extends for 1 or 2 mm beyond the resting point (3) of the board, in order to avoid irregular breaks when the laying is completed and the extension (6) cut off, which cause residual projections of the hoop from the external line of the laying.

[0053] A different practical solution, less advantageous than the previous one, is depicted in Figs. 2 and 3 showing a core (5) that longitudinally crosses the entire body of the hoop, in order to offer much greater load capacities. The general manufacturing concept remains unchanged, both as regards the hole (7), the residual hole (4) passing through the triangular opening (10) of the core, and the several holes (8) for the stable assembling metal core/plastic covering. In order to cut the extensions (6), after the laying is completed, a structural weakening of the material (15) crosses the metal core, as depicted in the detail of Fig. 3. In this case we get the advantages of lightness, but the problems of rust are not totally solved.

[0054] In order to better clarify what above stated, both as regards components and working dynamics, Fig. 4 shows the laying -C- of the constructing material (17), contained between the side boards (18) united by the invention (1). The boards are perfectly aligned both in vertical and in parallel, thanks to the precise resting point (3) where they are pushed by the wedges (14) inserted into the above described external holes that, pressed (P), thanks to the sloping side (13), exert a force (F) sufficient to place and align them.

[0055] Next Fig. 5 shows the laying (17) completed and ready for removal: removing the wedge (14) by reverse movement (P), the piece is free from the boards (18) and, by a simple vertical hit (P1) on the extension (6), we cause its break in the final point (or structurally weakened) of the metal core (16), so obtaining an external smooth surface, free from extending metal or plastic parts, and in practice ready for the successive surface operation, without need of further expensive and anti-aesthetic finishing operations. This figure shows the assembling of the shell with the board (18) rested on its internal part on the props (3) and on its external part on the posts (23) equipped with hole crossed by the hoop (1), so that the final portion (6) extends outside said board and post.

[0056] Fig. 6 shows a perspective view of the hoop (1), with the notches (19) for containing circular seals in plastic material (20) that, placed close to the containing board, inside the laying, completely isolate the outside, perfectly sealing indeed the portion of hoop that remains dipped into the piece. The seals, for better clarification, are depicted outside the hoop (1), in axis, in their original circular shape (20), but once inserted they perfectly suit the shape of their notch (19), conveniently placed near the breaking portion, so as to perfectly isolate the piece from possible external infiltrations. The same figure shows the props (3) for resting the board that contains the laying. This perspective view does not show the similar extension below, uniting the vertical alignment of the same boards. Between hole (7) and resting point (3) of the board there is the hole (4) used for possibly fixing the board by means of nails. The longitudinal wideness of the hole (7) will be approximately equivalent to the average largeness of the long portion (13) of the wedge (12), depicted in vertical exploded view compared to the holes (7). These sizes permit the safe and effective pressure of the wedge against the board, regardless of light discrepancies in their thickness, frequent drawback of raw materials. The angle created between vertical side (22) and sloping side (13) permits, in the pressure insertion of the wedge into the hole, to obtain such a pressure on the board sufficient to firmly fix it in place against the point (3).


Claims

1. Support for holding the opposite posts of the boards and/or the same boards forming the shell for the construction of concrete masonry, comprising a longitudinal element (1) having at least one end (6), preferably both ends, with hole (7) for the insertion of a wedge, characterized in that this support is made of plastic material and includes a metal core, or reinforcement, on at least part of the length of the same support.
 
2. Support as claimed in claim 1, characterized in that it consists of a longitudinal element (1) proportionally as long as the space between the opposite boards (18) of a shell, so that at lest one of its ends (6), preferably both, extend outside said boards for a length (6) that enters the hole on the posts (23) and further extends to permit the insertion of a wedge (14) or similar in the hole (7) made on the extending portion of the same posts, so as to steady fix the posts to the boards.
 
3. Support as claimed in claim 1, characterized in that it consists of a longitudinal element (1) proportionally as long as the space between the opposite boards (18) of a shell, so that at lest one of its ends (6), preferably both, extend outside said boards for a length (6), where a wedge (14) or similar, inserted into the hole (7), steady fixes the boards (18).
 
4. Support having one or more characteristics of any of the claims from 1 to 3, characterized in that it is realized by plastic pressure casting, with said metal core dipped inside.
 
5. Support having one or more characteristics of any of the claims from 1 to 4, characterized in that it comprises at least one final portion (6), preferably both, which includes inside a metal core (5) realized by pressure casting during the manufacturing of the piece.
 
6. Support having one or more characteristics of any of the claims from 1 to 5, characterized in that said metal core (5) is present only on the final portion (6), preferably both.
 
7. Support having one or more characteristics of any of the claims from 1 to 6, characterized in that said core (5) is preferably made of steel.
 
8. Support having one or more characteristics of any of the claims from 1 to 7, characterized in that said core (5) has a rectangular section and reduced thickness and comprises a correspondent hole (7) where no plastic material is injected during manufacturing.
 
9. Support having one or more characteristics of any of the claims from 1 to 8, characterized in that said core (5) comprises a sector, preferably of triangular shape (10), which is partially filled except for a passing hole (4) that can be used to fix the board below by means of nails.
 
10. Support having one or more characteristics of any of the claims from 1 to 9, characterized in that said metal core (5) comprises a series of holes (8) aimed at permitting the passage and therefore the total filling of the plastic material in pressure casting, making the same core connected with the plastic hoop.
 
11. Support having one or more characteristics of any of the claims from 1 to 10, characterized in that said metal core (5) extends for 1 or 2 mm beyond the prop (3) for resting the board.
 
12. Support having one or more characteristics of any of the claims from 1 to 11, characterized in that it has two couples of props (3) consisting of two extensions, one over and one under the surface (1) of the support.
 
13. Support having one or more characteristics of any of the claims from 1 to 12, characterized in that said core (5) arrives until the point of the props (3) or slightly inside them, so that when the final portion (6) including the core (5) is cut off, the entire metal core comes out and is eliminated from the rest of the support together with the final portion (6).
 
14. Support having one or more characteristics of any of the claims from 1 to 13, characterized in that it comprises on at least one extension (6), preferably on both extensions, in the immediate section inside the resting point (3) of the board, a notch (19) for the insertion of a seal (20).
 
15. Support having one or more characteristics of any of the claims from 1 to 14, characterized in that said seal (20) is in rubber or other similar material, connected to the same support.
 
16. Support having one or more characteristics of any of the claims from 1 to 15, characterized in that said seal (20) is in plastic realized by the same pressure casting used for the support.
 
17. Support having one or more characteristics of any of the claims from 1 to 16, characterized in that it comprises one or more seals (20) placed at one or more of its ends, which remain dipped inside the concrete laying forming the masonry.
 
18. Support having one or more characteristics of any of the claims from 1 to 17, characterized in that said seals consist of a ring OR, or similar, that fits into the notch (19).
 
19. Support having one or more characteristics of any of the claims from 1 to 4, characterized in that it comprises a metal core (5) that longitudinally crosses the entire body of the hoop.
 
20. Support as claimed in claim 19, characterized in that it comprises one or more characteristics of the claims from 7 to 18.
 
21. Support having one or more characteristics of any of the claims from 1 to 11, characterized in that the extension of the support has a hole (7) where a wedge enters, crossing also the hole of the post, therefore fixing the post to the board.
 
22. Support having one or more characteristics of any of the claims from 1 to 21, characterized in that, during the removing phase, the wedge is removed from the hole (7), the board is raised from the resting portion (5) and the support is broken in the point near the props (3).
 




Drawing