CA1302725C - Reinforcing rod holder for use in joining cast concrete work - Google Patents
Reinforcing rod holder for use in joining cast concrete workInfo
- Publication number
- CA1302725C CA1302725C CA000527286A CA527286A CA1302725C CA 1302725 C CA1302725 C CA 1302725C CA 000527286 A CA000527286 A CA 000527286A CA 527286 A CA527286 A CA 527286A CA 1302725 C CA1302725 C CA 1302725C
- Authority
- CA
- Canada
- Prior art keywords
- reinforcing rod
- rod holder
- cover
- reinforcing
- cover means
- 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 - Lifetime
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- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
- Reinforcement Elements For Buildings (AREA)
- Joining Of Building Structures In Genera (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
ABSTRACT
A REINFORCING ROD HOLDER FOR USE IN JOINING
CAST CONCRETE WORK
The reinforcing rod holder for use in joining cast concrete work has a hollow body comprising a box-shaped portion and a cover portion which comprises a metal plate with a rough surface and faces the concrete wall which is to be erected, the cover portion being adapted to remain in the erected concrete wall. On its outer wall, the box has means to permit concrete to pass behind the cover portion when the holder is embedded in concrete in order to secure the cover portion. In addition, securing means are disposed on the box and on the cover portion in order to secure the cover portion on the box. The reinforcing rods extend through rod holders, the upper portion of which holders protrude through the elongate openings in the metal plate and seal the plate.
The box of the holder is preferably formed from plastics material and can be very easily and fully removed after the holder has been embedded in concrete, whereby the holder can be manufactured more economically than a holder which is manufactured mainly or wholly from metal.
A REINFORCING ROD HOLDER FOR USE IN JOINING
CAST CONCRETE WORK
The reinforcing rod holder for use in joining cast concrete work has a hollow body comprising a box-shaped portion and a cover portion which comprises a metal plate with a rough surface and faces the concrete wall which is to be erected, the cover portion being adapted to remain in the erected concrete wall. On its outer wall, the box has means to permit concrete to pass behind the cover portion when the holder is embedded in concrete in order to secure the cover portion. In addition, securing means are disposed on the box and on the cover portion in order to secure the cover portion on the box. The reinforcing rods extend through rod holders, the upper portion of which holders protrude through the elongate openings in the metal plate and seal the plate.
The box of the holder is preferably formed from plastics material and can be very easily and fully removed after the holder has been embedded in concrete, whereby the holder can be manufactured more economically than a holder which is manufactured mainly or wholly from metal.
Description
~3027Z5 A REINFORCING ROD HOLDER FOR USE IN JOINING
CAST CONCRETE WORK
The present invention relates to a reinforcing rod holder for use in joining cast concrete work, comprising a hollow body in which may be disposed the free, bent ends of the reinforcing rods.
Such a reinforcing rod holder is known, for example, from CH-A-627 811, wherein its hollow body is formed from a front portion and a cover portion, and this holder is mainly produced from plastics material. In the last few years, the use of industrially manufactured reinforcing rod holders which have already been equipped before leaving the factory has increased very considerably, and a large number of extremely varied reinforcing rod holders have been designed and used. During the course of ever wider applications and ever greater attempts at rationalisation, it has become - -apparent that ever greater slgnificance is attributed to the thorough and rapid removal of the holder or portions thereof.
This was initially taken into consideration, on the one hand, by replacing the reinforcing rod holders, which were originally formed only from expanded plastics material, by hollow bodies formed from plastics material, thereby substantially facilitating removal. However, it is possible that these bodies formed from plastics material might break during removal and thereby involve additional work. On the other hand, there are reinforcing rod holders which are formed from metal or expanded metal and which remain in the wall after being embedded in concrete, so that it is only necessary to remove portions thereof, generally the cover portion.
Reinforcing rod holders which are substantially formed only from metal are relatively expensive and, in addition, an increasing number of countries are inclined to issue ,,, 7~
CAST CONCRETE WORK
The present invention relates to a reinforcing rod holder for use in joining cast concrete work, comprising a hollow body in which may be disposed the free, bent ends of the reinforcing rods.
Such a reinforcing rod holder is known, for example, from CH-A-627 811, wherein its hollow body is formed from a front portion and a cover portion, and this holder is mainly produced from plastics material. In the last few years, the use of industrially manufactured reinforcing rod holders which have already been equipped before leaving the factory has increased very considerably, and a large number of extremely varied reinforcing rod holders have been designed and used. During the course of ever wider applications and ever greater attempts at rationalisation, it has become - -apparent that ever greater slgnificance is attributed to the thorough and rapid removal of the holder or portions thereof.
This was initially taken into consideration, on the one hand, by replacing the reinforcing rod holders, which were originally formed only from expanded plastics material, by hollow bodies formed from plastics material, thereby substantially facilitating removal. However, it is possible that these bodies formed from plastics material might break during removal and thereby involve additional work. On the other hand, there are reinforcing rod holders which are formed from metal or expanded metal and which remain in the wall after being embedded in concrete, so that it is only necessary to remove portions thereof, generally the cover portion.
Reinforcing rod holders which are substantially formed only from metal are relatively expensive and, in addition, an increasing number of countries are inclined to issue ,,, 7~
regulations whereby metal portions have to be covered with a layer of concrete of specified thickness, for example 25 mm.
By way of contrast, the present invention seeks to provide a reinforcing rod holder which is lighweight in respect of its component parts, is transportable, and can be rapidly and easily assembled, the free ends of the reinforcing rods being well secured in the holder and being well protected from the possibility of liquid cement penetrating therein. Further it is sought to provide a holder which is much easier to remove, especially when compared with holders formed from plastics material or expanded material, and it is more economical both in terms of manufacture and in respect of the portion remaining in the erected wall, than reinforcing rod holders which are substantially formed from metal.
According to the invention the reinforcing rod holder comprises a hollow body in which may be disposed the free, bent ends of reinforcing rods, wherein the hollow body is formed from a box-shaped portion and a cover portion which comprises a metal plate and for facing a concrete wall to be erected, the cover portion being adapted to remain in the erected concrete wall.
Therefore this invention seeks to provide a reinforcing rod holder for use in joining cast concrete work comprising: a box-shaped body adapted to receive free ends of reinforcing rods;
a cover means removably secured to said body, for substantially enclosing said body; and an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body, said embedding means comprising a recess means formed in said box-shaped body for ~' " ' `
13~)Z725 2a 23444-268 permitting concrete to pass behind said cover means when the holder is embedded in concrete.
The invention is explained more fully hereinafter with reference to the following drawings.
Fig. 1 is a view, from above, of a first e~bodiment of a reinforcing rod holder according to the invention, part of which is shown without the cover portion.
Fig. 2 is a sectional view taken along the line II-II.
Fig. 3 shows a detail of Fig. 2 after the cover portion has been fitted.
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Fig. 4 is a sectional view taken along the line IV-IY of Fig. 1.
Fig. 5 is a sectional view taken along the line V-V
of Fig. 1.
Fig. 6 is an enlarged detail of a modified embodiment of the cover portion.
Fig. 7 is a view, from above, of a second embodiment of a reinforcing rod holder, part of which is shown without the cover portion.
Fig. 8 is a sectional view, taken along the line VIII-VIII of Fig. 7, of a modified embodiment of the cover portion.
Fig. 9 is a sectional view taken along the line IX-IX of Fig. 7.
Fig. 10 is a view, from above9 of a third embodiment of a reinforcing rod holder, part of which is shown without the cover portlon.
Fig. ll is a sectional ~iew taken along the line XI-XI of Fig. 10.
Fig. 12 is a sectional view of the reinforcing rod hoIder shown in Fig. 1, prior to its being embedded in concrete.
; Fig. 13 illustrates a reinforcing rod with the remaining cover portion after being embedded in concrete.
The first embodiment of a reinforcing rod holder includes a box 1, which is formed from plastics material, and a cover portion 2 at the wall end which is formed from metal and remains in the wall after the reinforcing rod holder has :
~ 130272S
been embedded in concrete. The cover portion remaining in the erected wall 55 is formed from only one plate which, on the one hand, is relatively simple to manufacture and, on the other hand, has smaller dimensions than hitherto-known portions of reinforcing holders which are formed from metal and are intended to remain in the erected wall.
The box 1 is provided with a circumferential, double, U-shaped edge 3 having an inner wall 4 and an outer wall 5.
The outer wall 5 has indentations 6 which are distributed around the entire outer wall. When the reinforing rod holder is embedded in concrete, these indentations 6 cause concrete to pass behind the cover portion plate 2 which is to remain behind, so that this plate is securely joined to the wall and cannot become loosened, even when the rods are straightened and the plastics portion of the holder is removed. Pins 7 are provided on the upper surface of the circumferential edge and, as can be seen from fig. 2, they extend through corres-ponding openings 8 in the cover portion and are compressed, see Fig. 3, by means of a suitable device in such a manner that they press and secure the cover portion onto the box.
Raised portions 10, which are disposed in the centre of the box base 9 and protrude therefrom, serve the same purpose, and they also have pins 7 which fit into the corresponding openings 8 in the cover portion and are compressed. Each of the edges on the longitudinal sides is provided with a cover bar 11 which has, on its outer surface, recesses 12 whiCh correspond to the indentations 6 and recesses 13 for exposing the pins 7. At the locations where the reinforcing rods 14 protrude from the box and cover portion, sockets 15 are provided in the cover bar 11 and extend through corres-ponding openings 16 in the cover portion. The sockets 15 taper upwardly and have, at their upper end, a hole 17 through which reinforcing rods are inserted. To permit the reinforcing rod to be inserted into the sockets, the inwardly orientated portion 18 of the cover bar and the inner surface of the socket 15 have a slot 19, as can be seen from Fig. 4. Instead of being extruded from plastics material as three component parts, the box and the two cover bars and the sockets can be extruded from plastics material in one piece.
To permit insertion of the rods, in this case, it is necessary for the entire box to be supported around is longitudinal central axis. The reinforcing rods 14 are bent in a conventional manner so that the free ends converge with respect to the longitudinal central axis of the box. As can be seen from Fig. 5, in particular, the sockets permit the entire rounded portion, i.e. the transitional area between the clamp portion and the free ends of the reinforcing rod, to be situated within the holder. This arrangement ensures that the reinforcing rod can be fully straightened after removal of the plastics box and the sockets, as shown in Fig. 13.
As already mentioned above, the cover portion 2 is formed from metal. Since this cover portion remains in the wall, it is advantageous for as good a join as possible to be established between this metal portion and the wall. For this reason, it is deslrable to provide the cover portion with a rough surface; this may be effected, for example, while the cover portion is being produced from expanded metal or, as shown in Fig. 6, by providing the cover portion with stamped and relatively sharp-edged raised portions 20. Other steps may also be taken, however, to increase the roughness of the surface.
In certain countries, there are regulations stipul-ating that unprotected metal, i.e. metal which is not rust-proof, must be covered with aminimum layer of concrete, for example. 25 mm. This would signify that the metal plate must ; 130Z725 ., have the prescrihed minimum spacing from one edge. To permit the metal plate to be moved nearer the edge, it is extremely desirable with such regulations to protect the metal either by applying a layer of plastics material or by spraying with other resistant materials, for example, by means of electro-, static powder coating or the like. It is clear, therefore, j that only the outer edge of the cover portion needs to be i coated and not the entire metal plate.
j 10 In the described example, the box 1 is formed from afilm of plastics material with a double, U-shaped edge. The plastics material may be replaced by another material; thus, I for example, a strong cardboard may also be used, and it isI not necessary for the edge to be formed from two walls which ! 15 are joined together in a U-shaped manner. It is also possible for the connection between the box portion and the cover portion to be effected in a manner other than by means of expanding pins. It is also possible, for example, to ~oin the two portions together by means of spot-welding or ; 20 glueing, or to use other suitable securing means. In this i embodiment, it may also prove appropriate to construct the metal plate in a multi-component manner so that, for example, ' it may be divided along the central axis.
Figures 7 to 9 illustrate a second embodiment of a reinforcing rod holder, whereby both the manufacture and the assembly of the reinforcing rod holder are an improvement over the first embodiment. Box 1 is the same as described above, but the cover bars on the longitudinal sides are missing and the cover portion has different cut-away portions. Instead of having the cover bars on the longitudinal sides, the reinforcing rods 14 are supported by transversely disposed rod holders 25 which also prevent liquid cement from penetra-ting therein. The rod holders, which;are also formed from ~302725 _ 7 --plastics material, have a length which corresponds to the width of the box 1 and a cross-section, which is shown in Figure 9, i.e. having a box-shaped form with a wide, circum-ferential edge 26, whereby the two side edges come to lie on the longitudinal sides of the box 1, and the cover portion is supported on all four circumferential edges. The upper portion of the rod holder converges in the centre to form a rib 27 which has a longitudinal central slot 28 extending to the openings 29 which are disposed at each end and through whic~ the two shanks of the reinforcing rod 14 engage.
The rib may have a reinforced portion 30 in the centre. On one side, the support member is connected to a hold-down member 31 which, as the name suggests, serves to hold-down the reinforcing rods.
For the assembly of the reinforcing rod holder, the rods are first of all isnerted into the box 1 with the bent shank ends which converge towards the centre, certain markings possibly having been applied previously to determine the spacings between the rods. The rod holders are then passed over the clamps and pressed-down, whereupon the cover plate ~2 is mounted thereon. The cover plate 32, in addition to having the above-described holes 8 for the pins 7, is provided with transversely extending slots 33 which are disposed according to the desired spacings between the reinforcing rods. As stated above, the pins 7 are subsequently pressed-down, either by means of a hammer, by compressed air or by a suitable device, and consequently the cover plate is secured to the box. As the cover plate is pressed-down, it also presses upon the circumfer-ential edge 26 of the rod holder whereby, on the one hand, the rod holder acts on the shank ends of the reinforcing rod together with the hold-down member 31 and, on the other hand, causes the slot 28 in the rod holder to be compressed, whereby liquid cement is effectively prevented from penetrating therein.
In a modified arrangement, the two longitudinal sides 3a of the box l may have recesses in which the two transverse edges of the rod holder engage in order to permit the insertion of these edges at predetermined locations. As can be seen from Fig. 9, in particular, the use of rod holders having a central rib ensures that the entire curvature of the reinforcing rods is situated inside the holder, thereby ensuring complete straightening after they have been embedded in concrete.
Figures 10 and 11 illustrate another embodiment of a reinforcing rod holder which, compared with the preceding example, provides further simplification both in the manufac-ture and in the assembly. Here also, the box 34 has a circumferential, double, U-shaped edge 35 with an inner wall 36 and an outer wall 37. The indentations 38 here are substantially longer than those in the two preceding examples, with the result that more concrete can pass behind the cover plate for better securement thereof. At the top end of each of the two longitudinal sides 39 of the inner edge 36, there is a shoulder portion 40 on which the edges 41 of the transverse sides of the rod holders 42 are supported, such edges being correspondingly shorter than those described in the preceding embodiment. The box also has a longitudinally central rib 43, which is raised from the base to substantially the same height as the circumferential edge 35. The hold-down member 44 of the rod holder is provided with recesse 45 which are disposed on both sides of the longitudinally central rib 43 and serve as guide means. To permit the reinforcing rods to be accurately aligned before the cover plate 46 is deposited, it is preferable to provide means for aligning the rod holders. Such means may be, for examole, small recesses 47 which are provided on the sides of the longtitud-inally central rib and in which corresponding cams 48 engage, 1302'725 g such cams being disposed at the guiding ends 49 - facing the longitudinally central rib 43 - of the recesses 45 in the hold-down member. However, other marking means may also be provided; for example, small pins may be provided on the upper edge of the longitudinally central rib, such pins engaging in holes in the hold-down member, or vice versa. In order to ensure an approximate alignment of the reinforcing rods during their insertion into the box, corresponding markings may be provided on the longitudinal edges of the box. The cover plate 46 is of a design similar to that of the preceding example, but here the pins 7 are only disposed on the circumferential edge and engage in corresponding openings 8. However, it is also possible to provide pins on the longitudinally central rib 43, such pins engaging through corresponding openings in the cover - portion. The rib 50 in the rod holder does not have any reinforcement in the centre and is particularly well-suited to forming a tight seal, since it has been shown that, when a pressure is exerted upon the edges 41 which are disposed on both sides f the rib, the two edges of the slot 51 in the rib are pressed towards each other.
For the purpose of securing the rods in the holder, it is advantageous to use holder inserts 52 which are also supported on the two shoulder portions 40 of the longitudinal edges and have recesses 53 disposed on both sides of the longitudinally central rib 43.
The component parts can be stacked one inside the other or one above the other in a very space-saving manner and be transported.
The assembly for this last-described rod holder is very simple. First of all, the reinforcing rods are inserted at previously designated locations; the rod holders are -~ - .. .
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mounted at the marked locations and the holder inserts are placed thereon; subsequently the cover plate is mounted and then the pins are compressed by means of a hammer or a suitable device in order to secure the cover plate. It is apparent from the description, especially from the last two examples, that it is not necessary for any tools to be used for the assembly of this reinforcing rod holder e~cept a hammer or, for a rational assembly, a pneumatically driven press, and the assembly is conceptually simple.
However, the reinforcing rod holder offers substantial advantages not only in terms of its manufacture and assembly, but also in terms of its securement and in terms of erecting the connecting wall. By providing the rod holders with the raised rib 50, or 27 in the preceding example, the second wall is provided with a tooth-like arrangement relative to the first wall and increases the securement.
Figure 12 is a sectional view of a portion of a secured relnforciny rod holder. The two casing boards 21 and 22 are visible, and it can be seen that the reinforcing rod holder is secured in the casing board 22 by means of nails 27. Nailing the reinforcing rod holder is considerably simplified in that the nails can be hit through the opening 8 and, above all, through the pins 7, with the result that the suitable locations can very easily be discovered, whereby the nails are partially guided. After the rod holder has been embedded in concrete, the free ends 24 of the reinforcing rod are straightened (see Fig. 13), and subsequently the box is easlly removed. If necessary, the cover bars 11 are also removed. As already mentioned above, because concrete engages behind the cover plate 32, 2 or 46, it is ensured that said plate is firmly anchored in the wall and is not loosened either when the reinforcing rod is straightened or when the box portion is pulled away.
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In the two last-described embodiments also, the box is preferably formed from a plastics film, but it is also possible here to use instead a different material, cardboard for example. The material of the cover plates 32 or 4O is the same as that of the cover plate 2 in the first example and may comprise expanded metal or a metal plate with a roughened surface. In addition, the base of the box 1 or 34 has bearing and guide surfaces to ensure that the reinforcing rods are securely held-down.
The three reinforcing rod holders, which are described above and illustrated, relate to reinforcing rods provided with a clamp and two free shanks, but it is possible to provide a suitably modified reinforcing rod holder for reinforcing rods which have only one shank and an open clamp.
: Thus, the width of the reinforcing rod will be only approx-imately half that of the reinforcing rod, as shown in Fig. 10 for example, and the other longitudinalwall which has the same shoulder portion 40 is disposed at the location of the longitudinally central rib 43. The-rod holders and the holder inserts are then suitably shaped, i.e. the rod holders have an opening in the centre and a suitably shaped hold-down member, whereas the holder inserts have only one recess.
Here also, the reinforcing rods can first of all be inserted, and then the rod holdersand the insert parts are deposited or p~aced, whereupon the cover plate can be mounted and is secured by means of the pins which extend through corres-ponding openings.
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By way of contrast, the present invention seeks to provide a reinforcing rod holder which is lighweight in respect of its component parts, is transportable, and can be rapidly and easily assembled, the free ends of the reinforcing rods being well secured in the holder and being well protected from the possibility of liquid cement penetrating therein. Further it is sought to provide a holder which is much easier to remove, especially when compared with holders formed from plastics material or expanded material, and it is more economical both in terms of manufacture and in respect of the portion remaining in the erected wall, than reinforcing rod holders which are substantially formed from metal.
According to the invention the reinforcing rod holder comprises a hollow body in which may be disposed the free, bent ends of reinforcing rods, wherein the hollow body is formed from a box-shaped portion and a cover portion which comprises a metal plate and for facing a concrete wall to be erected, the cover portion being adapted to remain in the erected concrete wall.
Therefore this invention seeks to provide a reinforcing rod holder for use in joining cast concrete work comprising: a box-shaped body adapted to receive free ends of reinforcing rods;
a cover means removably secured to said body, for substantially enclosing said body; and an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body, said embedding means comprising a recess means formed in said box-shaped body for ~' " ' `
13~)Z725 2a 23444-268 permitting concrete to pass behind said cover means when the holder is embedded in concrete.
The invention is explained more fully hereinafter with reference to the following drawings.
Fig. 1 is a view, from above, of a first e~bodiment of a reinforcing rod holder according to the invention, part of which is shown without the cover portion.
Fig. 2 is a sectional view taken along the line II-II.
Fig. 3 shows a detail of Fig. 2 after the cover portion has been fitted.
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Fig. 4 is a sectional view taken along the line IV-IY of Fig. 1.
Fig. 5 is a sectional view taken along the line V-V
of Fig. 1.
Fig. 6 is an enlarged detail of a modified embodiment of the cover portion.
Fig. 7 is a view, from above, of a second embodiment of a reinforcing rod holder, part of which is shown without the cover portion.
Fig. 8 is a sectional view, taken along the line VIII-VIII of Fig. 7, of a modified embodiment of the cover portion.
Fig. 9 is a sectional view taken along the line IX-IX of Fig. 7.
Fig. 10 is a view, from above9 of a third embodiment of a reinforcing rod holder, part of which is shown without the cover portlon.
Fig. ll is a sectional ~iew taken along the line XI-XI of Fig. 10.
Fig. 12 is a sectional view of the reinforcing rod hoIder shown in Fig. 1, prior to its being embedded in concrete.
; Fig. 13 illustrates a reinforcing rod with the remaining cover portion after being embedded in concrete.
The first embodiment of a reinforcing rod holder includes a box 1, which is formed from plastics material, and a cover portion 2 at the wall end which is formed from metal and remains in the wall after the reinforcing rod holder has :
~ 130272S
been embedded in concrete. The cover portion remaining in the erected wall 55 is formed from only one plate which, on the one hand, is relatively simple to manufacture and, on the other hand, has smaller dimensions than hitherto-known portions of reinforcing holders which are formed from metal and are intended to remain in the erected wall.
The box 1 is provided with a circumferential, double, U-shaped edge 3 having an inner wall 4 and an outer wall 5.
The outer wall 5 has indentations 6 which are distributed around the entire outer wall. When the reinforing rod holder is embedded in concrete, these indentations 6 cause concrete to pass behind the cover portion plate 2 which is to remain behind, so that this plate is securely joined to the wall and cannot become loosened, even when the rods are straightened and the plastics portion of the holder is removed. Pins 7 are provided on the upper surface of the circumferential edge and, as can be seen from fig. 2, they extend through corres-ponding openings 8 in the cover portion and are compressed, see Fig. 3, by means of a suitable device in such a manner that they press and secure the cover portion onto the box.
Raised portions 10, which are disposed in the centre of the box base 9 and protrude therefrom, serve the same purpose, and they also have pins 7 which fit into the corresponding openings 8 in the cover portion and are compressed. Each of the edges on the longitudinal sides is provided with a cover bar 11 which has, on its outer surface, recesses 12 whiCh correspond to the indentations 6 and recesses 13 for exposing the pins 7. At the locations where the reinforcing rods 14 protrude from the box and cover portion, sockets 15 are provided in the cover bar 11 and extend through corres-ponding openings 16 in the cover portion. The sockets 15 taper upwardly and have, at their upper end, a hole 17 through which reinforcing rods are inserted. To permit the reinforcing rod to be inserted into the sockets, the inwardly orientated portion 18 of the cover bar and the inner surface of the socket 15 have a slot 19, as can be seen from Fig. 4. Instead of being extruded from plastics material as three component parts, the box and the two cover bars and the sockets can be extruded from plastics material in one piece.
To permit insertion of the rods, in this case, it is necessary for the entire box to be supported around is longitudinal central axis. The reinforcing rods 14 are bent in a conventional manner so that the free ends converge with respect to the longitudinal central axis of the box. As can be seen from Fig. 5, in particular, the sockets permit the entire rounded portion, i.e. the transitional area between the clamp portion and the free ends of the reinforcing rod, to be situated within the holder. This arrangement ensures that the reinforcing rod can be fully straightened after removal of the plastics box and the sockets, as shown in Fig. 13.
As already mentioned above, the cover portion 2 is formed from metal. Since this cover portion remains in the wall, it is advantageous for as good a join as possible to be established between this metal portion and the wall. For this reason, it is deslrable to provide the cover portion with a rough surface; this may be effected, for example, while the cover portion is being produced from expanded metal or, as shown in Fig. 6, by providing the cover portion with stamped and relatively sharp-edged raised portions 20. Other steps may also be taken, however, to increase the roughness of the surface.
In certain countries, there are regulations stipul-ating that unprotected metal, i.e. metal which is not rust-proof, must be covered with aminimum layer of concrete, for example. 25 mm. This would signify that the metal plate must ; 130Z725 ., have the prescrihed minimum spacing from one edge. To permit the metal plate to be moved nearer the edge, it is extremely desirable with such regulations to protect the metal either by applying a layer of plastics material or by spraying with other resistant materials, for example, by means of electro-, static powder coating or the like. It is clear, therefore, j that only the outer edge of the cover portion needs to be i coated and not the entire metal plate.
j 10 In the described example, the box 1 is formed from afilm of plastics material with a double, U-shaped edge. The plastics material may be replaced by another material; thus, I for example, a strong cardboard may also be used, and it isI not necessary for the edge to be formed from two walls which ! 15 are joined together in a U-shaped manner. It is also possible for the connection between the box portion and the cover portion to be effected in a manner other than by means of expanding pins. It is also possible, for example, to ~oin the two portions together by means of spot-welding or ; 20 glueing, or to use other suitable securing means. In this i embodiment, it may also prove appropriate to construct the metal plate in a multi-component manner so that, for example, ' it may be divided along the central axis.
Figures 7 to 9 illustrate a second embodiment of a reinforcing rod holder, whereby both the manufacture and the assembly of the reinforcing rod holder are an improvement over the first embodiment. Box 1 is the same as described above, but the cover bars on the longitudinal sides are missing and the cover portion has different cut-away portions. Instead of having the cover bars on the longitudinal sides, the reinforcing rods 14 are supported by transversely disposed rod holders 25 which also prevent liquid cement from penetra-ting therein. The rod holders, which;are also formed from ~302725 _ 7 --plastics material, have a length which corresponds to the width of the box 1 and a cross-section, which is shown in Figure 9, i.e. having a box-shaped form with a wide, circum-ferential edge 26, whereby the two side edges come to lie on the longitudinal sides of the box 1, and the cover portion is supported on all four circumferential edges. The upper portion of the rod holder converges in the centre to form a rib 27 which has a longitudinal central slot 28 extending to the openings 29 which are disposed at each end and through whic~ the two shanks of the reinforcing rod 14 engage.
The rib may have a reinforced portion 30 in the centre. On one side, the support member is connected to a hold-down member 31 which, as the name suggests, serves to hold-down the reinforcing rods.
For the assembly of the reinforcing rod holder, the rods are first of all isnerted into the box 1 with the bent shank ends which converge towards the centre, certain markings possibly having been applied previously to determine the spacings between the rods. The rod holders are then passed over the clamps and pressed-down, whereupon the cover plate ~2 is mounted thereon. The cover plate 32, in addition to having the above-described holes 8 for the pins 7, is provided with transversely extending slots 33 which are disposed according to the desired spacings between the reinforcing rods. As stated above, the pins 7 are subsequently pressed-down, either by means of a hammer, by compressed air or by a suitable device, and consequently the cover plate is secured to the box. As the cover plate is pressed-down, it also presses upon the circumfer-ential edge 26 of the rod holder whereby, on the one hand, the rod holder acts on the shank ends of the reinforcing rod together with the hold-down member 31 and, on the other hand, causes the slot 28 in the rod holder to be compressed, whereby liquid cement is effectively prevented from penetrating therein.
In a modified arrangement, the two longitudinal sides 3a of the box l may have recesses in which the two transverse edges of the rod holder engage in order to permit the insertion of these edges at predetermined locations. As can be seen from Fig. 9, in particular, the use of rod holders having a central rib ensures that the entire curvature of the reinforcing rods is situated inside the holder, thereby ensuring complete straightening after they have been embedded in concrete.
Figures 10 and 11 illustrate another embodiment of a reinforcing rod holder which, compared with the preceding example, provides further simplification both in the manufac-ture and in the assembly. Here also, the box 34 has a circumferential, double, U-shaped edge 35 with an inner wall 36 and an outer wall 37. The indentations 38 here are substantially longer than those in the two preceding examples, with the result that more concrete can pass behind the cover plate for better securement thereof. At the top end of each of the two longitudinal sides 39 of the inner edge 36, there is a shoulder portion 40 on which the edges 41 of the transverse sides of the rod holders 42 are supported, such edges being correspondingly shorter than those described in the preceding embodiment. The box also has a longitudinally central rib 43, which is raised from the base to substantially the same height as the circumferential edge 35. The hold-down member 44 of the rod holder is provided with recesse 45 which are disposed on both sides of the longitudinally central rib 43 and serve as guide means. To permit the reinforcing rods to be accurately aligned before the cover plate 46 is deposited, it is preferable to provide means for aligning the rod holders. Such means may be, for examole, small recesses 47 which are provided on the sides of the longtitud-inally central rib and in which corresponding cams 48 engage, 1302'725 g such cams being disposed at the guiding ends 49 - facing the longitudinally central rib 43 - of the recesses 45 in the hold-down member. However, other marking means may also be provided; for example, small pins may be provided on the upper edge of the longitudinally central rib, such pins engaging in holes in the hold-down member, or vice versa. In order to ensure an approximate alignment of the reinforcing rods during their insertion into the box, corresponding markings may be provided on the longitudinal edges of the box. The cover plate 46 is of a design similar to that of the preceding example, but here the pins 7 are only disposed on the circumferential edge and engage in corresponding openings 8. However, it is also possible to provide pins on the longitudinally central rib 43, such pins engaging through corresponding openings in the cover - portion. The rib 50 in the rod holder does not have any reinforcement in the centre and is particularly well-suited to forming a tight seal, since it has been shown that, when a pressure is exerted upon the edges 41 which are disposed on both sides f the rib, the two edges of the slot 51 in the rib are pressed towards each other.
For the purpose of securing the rods in the holder, it is advantageous to use holder inserts 52 which are also supported on the two shoulder portions 40 of the longitudinal edges and have recesses 53 disposed on both sides of the longitudinally central rib 43.
The component parts can be stacked one inside the other or one above the other in a very space-saving manner and be transported.
The assembly for this last-described rod holder is very simple. First of all, the reinforcing rods are inserted at previously designated locations; the rod holders are -~ - .. .
.
;
.
.
mounted at the marked locations and the holder inserts are placed thereon; subsequently the cover plate is mounted and then the pins are compressed by means of a hammer or a suitable device in order to secure the cover plate. It is apparent from the description, especially from the last two examples, that it is not necessary for any tools to be used for the assembly of this reinforcing rod holder e~cept a hammer or, for a rational assembly, a pneumatically driven press, and the assembly is conceptually simple.
However, the reinforcing rod holder offers substantial advantages not only in terms of its manufacture and assembly, but also in terms of its securement and in terms of erecting the connecting wall. By providing the rod holders with the raised rib 50, or 27 in the preceding example, the second wall is provided with a tooth-like arrangement relative to the first wall and increases the securement.
Figure 12 is a sectional view of a portion of a secured relnforciny rod holder. The two casing boards 21 and 22 are visible, and it can be seen that the reinforcing rod holder is secured in the casing board 22 by means of nails 27. Nailing the reinforcing rod holder is considerably simplified in that the nails can be hit through the opening 8 and, above all, through the pins 7, with the result that the suitable locations can very easily be discovered, whereby the nails are partially guided. After the rod holder has been embedded in concrete, the free ends 24 of the reinforcing rod are straightened (see Fig. 13), and subsequently the box is easlly removed. If necessary, the cover bars 11 are also removed. As already mentioned above, because concrete engages behind the cover plate 32, 2 or 46, it is ensured that said plate is firmly anchored in the wall and is not loosened either when the reinforcing rod is straightened or when the box portion is pulled away.
.
In the two last-described embodiments also, the box is preferably formed from a plastics film, but it is also possible here to use instead a different material, cardboard for example. The material of the cover plates 32 or 4O is the same as that of the cover plate 2 in the first example and may comprise expanded metal or a metal plate with a roughened surface. In addition, the base of the box 1 or 34 has bearing and guide surfaces to ensure that the reinforcing rods are securely held-down.
The three reinforcing rod holders, which are described above and illustrated, relate to reinforcing rods provided with a clamp and two free shanks, but it is possible to provide a suitably modified reinforcing rod holder for reinforcing rods which have only one shank and an open clamp.
: Thus, the width of the reinforcing rod will be only approx-imately half that of the reinforcing rod, as shown in Fig. 10 for example, and the other longitudinalwall which has the same shoulder portion 40 is disposed at the location of the longitudinally central rib 43. The-rod holders and the holder inserts are then suitably shaped, i.e. the rod holders have an opening in the centre and a suitably shaped hold-down member, whereas the holder inserts have only one recess.
Here also, the reinforcing rods can first of all be inserted, and then the rod holdersand the insert parts are deposited or p~aced, whereupon the cover plate can be mounted and is secured by means of the pins which extend through corres-ponding openings.
. ;
`
, ` `, i '
Claims (21)
1. A reinforcing rod holder for use in joining cast concrete work comprising:
a box-shaped body adapted to receive free ends of reinforcing rods;
a cover means removably secured to said body, for substantially enclosing said body; and an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body, said embedding means comprising a recess means formed in said box-shaped body for permitting concrete to pass behind said cover means when the holder is embedded in concrete.
a box-shaped body adapted to receive free ends of reinforcing rods;
a cover means removably secured to said body, for substantially enclosing said body; and an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body, said embedding means comprising a recess means formed in said box-shaped body for permitting concrete to pass behind said cover means when the holder is embedded in concrete.
2. A reinforcing rod holder according to claim 1, further comprising securing means disposed on said body and on said cover means for removably securing said cover means to said body.
3. A reinforcing rod holder according to claim 2, wherein said securing means comprises securing holes disposed around a perimeter of said cover means and pin means disposed on said body in positions congruent with said securing holes, for removably securing said cover means to said body.
4. A reinforcing rod holder according to claim 1, wherein said box-shaped body comprises a bottom wall and a perimeter wall, said perimeter wall, being comprised of an inner wall and an outer wall joined together at upper surfaces thereof; and wherein said recess means comprise indentations formed in said outer wall.
5. A reinforcing rod holder for use in joining cast concrete work comprising:
a box-shaped body adapted to receive free ends of reinforcing rods, said body comprising a pair of shoulder portions disposed along parallel interior edges thereof and displaced from each other by a displacement distance;
a cover means removably secured to said body for substantially enclosing said body;
an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body; and at least one rod retainer having a length substantially corresponding to said displacement distance and having a perimetric edge;
wherein said perimetric edge of each rod retainer rests atop said pair of shoulder portions.
a box-shaped body adapted to receive free ends of reinforcing rods, said body comprising a pair of shoulder portions disposed along parallel interior edges thereof and displaced from each other by a displacement distance;
a cover means removably secured to said body for substantially enclosing said body;
an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body; and at least one rod retainer having a length substantially corresponding to said displacement distance and having a perimetric edge;
wherein said perimetric edge of each rod retainer rests atop said pair of shoulder portions.
6. A reinforcing rod holder according to claim 5, wherein at least a perimeter of said cover means is provided with a protective layer.
7. A reinforcing rod holder according to claim 6, wherein said protective layer is comprised of a material selected from the group consisting of plastics material and electrostatically coated covering.
8. A reinforcing rod holder according to claim 5, wherein said cover means comprises sharp-edged raised means for increasing the roughness of the cover means surface.
9. A reinforcing rod holder according to claim 5, wherein said cover means has openings disposed at locations corresponding to said rod retainers.
10. A reinforcing rod holder according to claim 5, wherein said rod retainers are each provided with a first pair of openings for receiving reinforcing rods and said cover means is provided with second pairs of openings for receiving reinforcing rods; and wherein said cover means is disposed above said rod retainers, said first pairs of openings being aligned with said second pairs of openings.
11. A reinforcing rod holder according to claim 10, wherein each of said rod retainers comprise:
a raised rib which abuts said first pair of openings;
a longitudinal slot disposed in said raised rib; and a hold-down means, disposed at a first end of said rod retainer, for holding a reinforcing rod down inside said body.
a raised rib which abuts said first pair of openings;
a longitudinal slot disposed in said raised rib; and a hold-down means, disposed at a first end of said rod retainer, for holding a reinforcing rod down inside said body.
12. A reinforcing rod holder according to claim 11, further comprising:
raised portions disposed along a central axis of said body;
a securing pin disposed on each raised portion; and wherein said cover means is provided with a set of third openings congruent with said raised portions, whereby said securing pins extend through said third openings in the cover means.
raised portions disposed along a central axis of said body;
a securing pin disposed on each raised portion; and wherein said cover means is provided with a set of third openings congruent with said raised portions, whereby said securing pins extend through said third openings in the cover means.
13. A reinforcing rod holder according to claim 5 further comprising:
a body rib disposed along a longitudinal extent of said body; and a positioning means for positioning reinforcing rods within said body.
a body rib disposed along a longitudinal extent of said body; and a positioning means for positioning reinforcing rods within said body.
14. A reinforcing rod holder according to claim 13, further comprising aligning means for aligning said rod retainers, said aligning means comprising:
retaining means disposed on the shoulder portions of said body for securing said rod retainers; and a pair of aligning recesses disposed on either side of said body rib for aligning said rod retainers.
retaining means disposed on the shoulder portions of said body for securing said rod retainers; and a pair of aligning recesses disposed on either side of said body rib for aligning said rod retainers.
15. A reinforcing rod holder according to claim 13, wherein said positioning means comprises:
a hold-down means for holding down reinforcing rods within said body, said hold-down means being disposed transversely to said body rib and having a recess on either side of said body
a hold-down means for holding down reinforcing rods within said body, said hold-down means being disposed transversely to said body rib and having a recess on either side of said body
16 23444-268 rib.
16. A reinforcing rod holder according to claim 5, wherein said shoulder portions comprise recess means for receiving and aligning said rod retainers.
16. A reinforcing rod holder according to claim 5, wherein said shoulder portions comprise recess means for receiving and aligning said rod retainers.
17. A reinforcing rod holder for use in joining cast concrete work comprising:
a box-shaped body adapted to receive free ends of reinforcing rods, said body comprising a bottom wall and a perimeter wall, said perimeter wall being comprised of an inner wall and an outer wall joined together at upper surfaces thereof;
a cover means removably secured to said body, for substantially enclosing said body;
an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body, said embedding means comprising indentations formed in said outer wall for permitting entry of concrete;
a pair of cover bars disposed along parallel longitudinal edges of said inner wall, said cover bars having a plurality of receiving recesses for receiving reinforcing rods;
and socket means, disposed on said cover bars around said receiving recesses, for retaining reinforcing rods; and wherein said cover means further comprises openings through which said socket means protrude.
a box-shaped body adapted to receive free ends of reinforcing rods, said body comprising a bottom wall and a perimeter wall, said perimeter wall being comprised of an inner wall and an outer wall joined together at upper surfaces thereof;
a cover means removably secured to said body, for substantially enclosing said body;
an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body, said embedding means comprising indentations formed in said outer wall for permitting entry of concrete;
a pair of cover bars disposed along parallel longitudinal edges of said inner wall, said cover bars having a plurality of receiving recesses for receiving reinforcing rods;
and socket means, disposed on said cover bars around said receiving recesses, for retaining reinforcing rods; and wherein said cover means further comprises openings through which said socket means protrude.
18. A reinforcing rod holder according to claim 17, wherein said body, said cover bars, and said socket means are integrally formed from plastics material.
19. A reinforcing rod holder according to claim 18, wherein said body has raised portions along a central axis thereof; and wherein a securing pin is disposed on each of said raised portions and extends through a congruent opening in said cover means.
20. A reinforcing rod holder according to claim 17, wherein said socket means are frusto-conically shaped and comprise a slot means disposed along an inner surface thereof.
21. A reinforcing rod holder for use in joining cast concrete work comprising:
a box-shaped body adapted to receive free ends of reinforcing rods, said body comprising a pair of shoulder portions disposed along parallel interior edges thereof and displaced from each other by a displacement distance;
a cover means removably secured to said body for substantially enclosing said body;
an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body; and at least one rod retainer having a length substantially corresponding to said displacement distance and having a perimetric edge;
wherein said perimetric edge of each rod retainer rests atop said pair of shoulder portions.
a box-shaped body adapted to receive free ends of reinforcing rods, said body comprising a pair of shoulder portions disposed along parallel interior edges thereof and displaced from each other by a displacement distance;
a cover means removably secured to said body for substantially enclosing said body;
an embedding means for embedding said cover means in a concrete mass, apart from said body, while said cover means is removably secured to said body; and at least one rod retainer having a length substantially corresponding to said displacement distance and having a perimetric edge;
wherein said perimetric edge of each rod retainer rests atop said pair of shoulder portions.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP86810014.0 | 1986-01-15 | ||
| EP86810014 | 1986-01-15 | ||
| EP86810139A EP0230206B1 (en) | 1986-01-15 | 1986-03-24 | Reinforcement-iron for use in joining cast concrete work |
| EP86810139.5 | 1986-03-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1302725C true CA1302725C (en) | 1992-06-09 |
Family
ID=26106500
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000527286A Expired - Lifetime CA1302725C (en) | 1986-01-15 | 1987-01-14 | Reinforcing rod holder for use in joining cast concrete work |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPH07113236B2 (en) |
| CN (1) | CN1012745B (en) |
| AT (1) | ATE54699T1 (en) |
| AU (1) | AU589480B2 (en) |
| CA (1) | CA1302725C (en) |
| DK (1) | DK167324B1 (en) |
| ES (1) | ES2048687A6 (en) |
| FI (1) | FI82745C (en) |
| HK (1) | HK136293A (en) |
| NO (1) | NO175323C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU657707B2 (en) * | 1990-11-02 | 1995-03-23 | Boral Building Services Pty Limited | Continuity strip for reinforced concrete |
| FI126406B (en) * | 2011-01-18 | 2016-11-15 | Peikko Group Oy | Housing for wire loop |
| CN104074314B (en) * | 2014-07-17 | 2016-06-01 | 长沙远大住宅工业集团有限公司 | Precast wall panel bury shearing shearkey box and working method thereof in advance |
| CN108385112A (en) * | 2018-02-09 | 2018-08-10 | 国网山东省电力公司经济技术研究院 | Concrete reinforcement corrosion cathode compensation device |
| CN108792597B (en) * | 2018-06-27 | 2019-11-12 | 中国十九冶集团有限公司 | Steel bar clamp |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4723048U (en) * | 1971-04-06 | 1972-11-15 | ||
| CH627811A5 (en) * | 1978-12-18 | 1982-01-29 | Brechbuehler Fritz | ARMORING IRON HOLDER FOR USE IN CONNECTING CONCRETE. |
| US4325533A (en) * | 1979-08-23 | 1982-04-20 | Sigma Bauelemente Gmbh | Housing device for isolating connecting reinforcements at joints between first and subsequently poured concrete structures |
| EP0055321B1 (en) * | 1980-12-29 | 1985-03-20 | Losinger AG | Connecting rods holding means for the realization of an efficient bond between two building elements |
| JPS5856288U (en) * | 1981-10-12 | 1983-04-16 | 株式会社クボタ | insulation pipe |
-
1986
- 1986-03-24 AT AT86810139T patent/ATE54699T1/en not_active IP Right Cessation
-
1987
- 1987-01-06 AU AU67168/87A patent/AU589480B2/en not_active Ceased
- 1987-01-07 DK DK7187A patent/DK167324B1/en not_active IP Right Cessation
- 1987-01-12 FI FI870106A patent/FI82745C/en not_active IP Right Cessation
- 1987-01-14 JP JP62007383A patent/JPH07113236B2/en not_active Expired - Lifetime
- 1987-01-14 NO NO870145A patent/NO175323C/en unknown
- 1987-01-14 CA CA000527286A patent/CA1302725C/en not_active Expired - Lifetime
- 1987-01-14 ES ES8700068A patent/ES2048687A6/en not_active Expired - Lifetime
- 1987-01-14 CN CN 87100262 patent/CN1012745B/en not_active Expired
-
1993
- 1993-12-09 HK HK136293A patent/HK136293A/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI870106A0 (en) | 1987-01-12 |
| ATE54699T1 (en) | 1990-08-15 |
| FI82745B (en) | 1990-12-31 |
| HK136293A (en) | 1993-12-17 |
| JPS62228540A (en) | 1987-10-07 |
| CN87100262A (en) | 1987-08-26 |
| CN1012745B (en) | 1991-06-05 |
| NO870145L (en) | 1987-07-16 |
| AU589480B2 (en) | 1989-10-12 |
| JPH07113236B2 (en) | 1995-12-06 |
| DK7187A (en) | 1987-07-16 |
| FI82745C (en) | 1991-04-10 |
| NO175323C (en) | 1994-09-28 |
| AU6716887A (en) | 1987-07-16 |
| ES2048687A6 (en) | 1994-03-16 |
| NO175323B (en) | 1994-06-20 |
| FI870106A (en) | 1987-07-16 |
| DK167324B1 (en) | 1993-10-11 |
| NO870145D0 (en) | 1987-01-14 |
| DK7187D0 (en) | 1987-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |