CA2219825C - A method for production of reinforcement chairs and a mould for use in the production - Google Patents
A method for production of reinforcement chairs and a mould for use in the production Download PDFInfo
- Publication number
- CA2219825C CA2219825C CA002219825A CA2219825A CA2219825C CA 2219825 C CA2219825 C CA 2219825C CA 002219825 A CA002219825 A CA 002219825A CA 2219825 A CA2219825 A CA 2219825A CA 2219825 C CA2219825 C CA 2219825C
- Authority
- CA
- Canada
- Prior art keywords
- mould
- reinforcement
- production
- chairs
- reinforcement chairs
- 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 - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/348—Moulds, cores, or mandrels of special material, e.g. destructible materials of plastic material or rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/0064—Moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished moulding surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/16—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes
- B28B7/18—Moulds for making shaped articles with cavities or holes open to the surface, e.g. with blind holes the holes passing completely through the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B7/00—Moulds; Cores; Mandrels
- B28B7/34—Moulds, cores, or mandrels of special material, e.g. destructible materials
- B28B7/346—Manufacture of moulds
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
- E04C5/20—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups of material other than metal or with only additional metal parts, e.g. concrete or plastics spacers with metal binding wires
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Reinforcement Elements For Buildings (AREA)
- Forms Removed On Construction Sites Or Auxiliary Members Thereof (AREA)
Abstract
The invention concerns a method for production of reinforcement chairs in concrete for use in steel-armoured concrete structures, wherein the reinforcement chairs are cast in a mould (9) of a material which is elastic, preferably a two-component rubber mass, and that after hardening the reinforcement chairs are removed by elastically bending the mould's wall par ts (11). The invention also concerns a mould for use in production of reinforcement chairs wherein the mould has walls adapted to the shape of the reinforcement chairs, which are made of an elastic material, especially a tw o- component rubber mass, and that a releasable metal rod (10) is provided perpendicularly through the mould's wall parts, for production of through- going mounting holes in the reinforcement chair.
Description
CA 0221982~ 1997-11-21 W O96137351 pCTANO95/00082 .A method for production of reinforcement chairs and a mould for use in the production The present invention concerns a method for production of reinforcement chairs in concrete for use in steel-armoured concrete structures, together with s a mould for use in production of the reinforcement chairs.
Reinforcement chairs are used in order to position reinforcement steel which is provided in casting moulds, both before and during filling of the casting moulds with concrete. The reinforcement chairs can be made of various materials, such as, e.g., plastic, extruded concrete. The problems involved in 10 using known reinforcement chairs can be divided into the following two categories:
1. Reinforcement chairs made of materials which have different physical properties from concrete. In the event of temperature changes, due to different expansion coefficients, these will lead to the occurrence of 5 openings/cracks between concrete and reinforcement chair, thus causing water to penetrate into the concrete, which in turn can cause corrosion damage in the reinforcement steel. This drawback is further reinforced if there is not adequate adhesion between the concrete and the reinforcement chair.
Reinforcement chairs are used in order to position reinforcement steel which is provided in casting moulds, both before and during filling of the casting moulds with concrete. The reinforcement chairs can be made of various materials, such as, e.g., plastic, extruded concrete. The problems involved in 10 using known reinforcement chairs can be divided into the following two categories:
1. Reinforcement chairs made of materials which have different physical properties from concrete. In the event of temperature changes, due to different expansion coefficients, these will lead to the occurrence of 5 openings/cracks between concrete and reinforcement chair, thus causing water to penetrate into the concrete, which in turn can cause corrosion damage in the reinforcement steel. This drawback is further reinforced if there is not adequate adhesion between the concrete and the reinforcement chair.
2. Reinforcement chairs made of concrete which do not have the strength 20 necessary in order to withstand the loads to which they are exposed in the casting moulds. Production processes currently in use restrict the possibilitiesof giving the reinforcement chairs the design necessary in order to satisfy requirements for securing them in the casting moulds, and requirements that the reinforcement chairs should not fall out of the completed structure, 25 thereby permitting water to penetrate into the concrete, even without adhesion between reinforcement chair and concrete.
The object of the present invention is to provide a method for production of reinforcement chairs which avoids the above-mentioned disadvantages, and a ~' mould for use in connection with the method.
30 These objects are achieved with a method for production of reinforcement chairs and a mould for use in connection with the method according to the CA 022l982~ l997-ll-2l W O96/37351 PCTANO~5/0~7 type mentioned in the introduction, which is characterized by the features indicated in the attached claims.
By means of the invention a method is obtained by simple means for the production of reinforcement chairs which substantially increases the strength 5 and reduces the production time for reinforcement chairs.
The design according to the invention increases the contact surface between concrete and reinforcement chair, and by means of cut-outs and through-going holes the reinforcement chair is secured against sliding out of the completed concrete structure.
10 In short the principle of the invention consists in the fact that the method for production of reinforcement chairs for use in steel-armoured concrete structures and the casting mould for use in the production of the reinforcement chairs is designed in such a manner that completed reinforcement chairs both with cut-outs and holes can be removed without 15 having to deskoy the casting mould.
The invention will now be described in more detail by means of an embodiment which is illustrated in the drawing, in which:
fig. 1 is a perspective view of a reinforcement chair, fig. 2 is a perspective view of a plaster model of a reinforcement chair 20 provided in a simple wooden casting mould for the production of prototypes, preferably of plaster, and fig. 3 is a perspective view of a partial section of an elastic casting mould according to the invention.
Fig. 1 illustrates a reinforcement chair 1 which consists of a base part 2 to 25 abut against the foundation and which in a first upper surface 3, opposite the base part 2, is provided with a cut-out or recess to abut against a reinforcement steel (not shown), and where in a second upper surface, opposite the base part 2, there is provided a through-going hole 4 for mounting it on to the foundation, e.g. by means of nails. In the largest side 30 surfaces there is further provided a through-going hole 5 in the area of the CA 0221982~ 1997-11-21 W O96/37351 PCTAN095/CA~Y2 cut-out 3, for mounting the reinforcement chair 1 by means of binding wire to the reinforcement bar. The reinforcement chair 1 is also provided with further cut-outs or grooves 6 and recesses 7 in order to increase the contact surface ~ between reinforcement chair and concrete and thereby provide maximum binding power to the surrounding concrete. In order to simplify the production of the reinforcement chairs, one of the largest side surfaces is completely flat.
As illustrated in fig. 2, the base part 2 is designed with least possible contact with the formwork in order to reduce the surface of the part of the reinforcement chair which will be aligned with the completed concrete, and thereby reduce the penetration of moisture between reinforcement chair and the surrounding concrete.
Fig. 3 is a partial section of a casting mould 9 for the production of reinforcement chairs in concrete.
1S The method for production of reinforcement chairs in concrete for use in steel-armoured concrete structures is implemented in the following manner:
1. A plaster model in the desired shape, e.g. according to the design in fig.
1, is produced manually.
2. The plaster model is then arranged in a simple wooden mould 8, see fig.
2, and a mixture of two-component rubber mass is then poured down into the mould.
The object of the present invention is to provide a method for production of reinforcement chairs which avoids the above-mentioned disadvantages, and a ~' mould for use in connection with the method.
30 These objects are achieved with a method for production of reinforcement chairs and a mould for use in connection with the method according to the CA 022l982~ l997-ll-2l W O96/37351 PCTANO~5/0~7 type mentioned in the introduction, which is characterized by the features indicated in the attached claims.
By means of the invention a method is obtained by simple means for the production of reinforcement chairs which substantially increases the strength 5 and reduces the production time for reinforcement chairs.
The design according to the invention increases the contact surface between concrete and reinforcement chair, and by means of cut-outs and through-going holes the reinforcement chair is secured against sliding out of the completed concrete structure.
10 In short the principle of the invention consists in the fact that the method for production of reinforcement chairs for use in steel-armoured concrete structures and the casting mould for use in the production of the reinforcement chairs is designed in such a manner that completed reinforcement chairs both with cut-outs and holes can be removed without 15 having to deskoy the casting mould.
The invention will now be described in more detail by means of an embodiment which is illustrated in the drawing, in which:
fig. 1 is a perspective view of a reinforcement chair, fig. 2 is a perspective view of a plaster model of a reinforcement chair 20 provided in a simple wooden casting mould for the production of prototypes, preferably of plaster, and fig. 3 is a perspective view of a partial section of an elastic casting mould according to the invention.
Fig. 1 illustrates a reinforcement chair 1 which consists of a base part 2 to 25 abut against the foundation and which in a first upper surface 3, opposite the base part 2, is provided with a cut-out or recess to abut against a reinforcement steel (not shown), and where in a second upper surface, opposite the base part 2, there is provided a through-going hole 4 for mounting it on to the foundation, e.g. by means of nails. In the largest side 30 surfaces there is further provided a through-going hole 5 in the area of the CA 0221982~ 1997-11-21 W O96/37351 PCTAN095/CA~Y2 cut-out 3, for mounting the reinforcement chair 1 by means of binding wire to the reinforcement bar. The reinforcement chair 1 is also provided with further cut-outs or grooves 6 and recesses 7 in order to increase the contact surface ~ between reinforcement chair and concrete and thereby provide maximum binding power to the surrounding concrete. In order to simplify the production of the reinforcement chairs, one of the largest side surfaces is completely flat.
As illustrated in fig. 2, the base part 2 is designed with least possible contact with the formwork in order to reduce the surface of the part of the reinforcement chair which will be aligned with the completed concrete, and thereby reduce the penetration of moisture between reinforcement chair and the surrounding concrete.
Fig. 3 is a partial section of a casting mould 9 for the production of reinforcement chairs in concrete.
1S The method for production of reinforcement chairs in concrete for use in steel-armoured concrete structures is implemented in the following manner:
1. A plaster model in the desired shape, e.g. according to the design in fig.
1, is produced manually.
2. The plaster model is then arranged in a simple wooden mould 8, see fig.
2, and a mixture of two-component rubber mass is then poured down into the mould.
3. The negative impression of the reinforcement chair thus constitutes a casting mould for the production of further plaster models/prototypes, which are then moulded in the desired number corresponding to the size of the actual main mould.
4. The plaster models are then glued to the bottom of the main mould, ~' which is also made of wood, according to an optimum pattern, e.g. according to fig. 3, thus providing room for as many plaster models as possible. The main mould is thus intended for production of several chairs at a time, e.g.
50-150. The wooden mould is then filled with a two-component rubber mass 9.
-CA 0221982~ 1997-11-21 W O96/373~1 PCTnN095/00082 5. The moulding mass is then hardened for approximately 12 hours, whereupon the plaster models are easily released from the elastic mould.
50-150. The wooden mould is then filled with a two-component rubber mass 9.
-CA 0221982~ 1997-11-21 W O96/373~1 PCTnN095/00082 5. The moulding mass is then hardened for approximately 12 hours, whereupon the plaster models are easily released from the elastic mould.
6. For the production of the through-going hole 4 for nails, holes are drilled in the rubber mould 9, thus enabling, e.g., a teflon-coated metal rod/-shaft 5 10, which is coated with a thin layer of oil, to be arranged horizontally in the mould, cf. fig. 3. With regard to the through-going holes 5 for binding wire, these are provided by the design of the rubber mould in the form of bosses which extend perpendicularly upwards from the bottom of the mould.
7. The main form is then filled with concrete, which is vibrated and hardened for approximately 8 hours at 40~C . The metal rods 10 are then removed from the rubber mould and completed reinforcement chairs can be easily loosened from the mould 9 by elastically bending the mould's wall parts 11. Since the rubber mould 9 consists of an elastic material, and the completed reinforcement chairs are removed after hardening by elastically 15 bending the mould's wall parts 11, and without the mould being destroyed, the rubber mould can be used repeatedly and is thereby particularly suited to mass production of reinforcement chairs.
With respect to steps 1 to 6, these apply to production of the actual rubber mould 9, while step 7 concerns the actual production of reinforcement chairs 20 in concrete for use in steel-armoured concrete structures.
Since the reinforcement chairs are cast in moulds made of two-component rubber mass, which makes the casting moulds very flexible, it is thereby possible to produce reinforcement chairs supplied with cut-outs 6, recesses 7 and through-going holes 4,5, while at the same time the nature of the rubber 25 moulds as opposed to known designs permits the moulds to be re-used.
The strength of the reinforcement chairs is particularly due to the fact that they are cast in moulds of heat-insulating materials, and thus maintain a stable temperature during the hardening process.
With respect to steps 1 to 6, these apply to production of the actual rubber mould 9, while step 7 concerns the actual production of reinforcement chairs 20 in concrete for use in steel-armoured concrete structures.
Since the reinforcement chairs are cast in moulds made of two-component rubber mass, which makes the casting moulds very flexible, it is thereby possible to produce reinforcement chairs supplied with cut-outs 6, recesses 7 and through-going holes 4,5, while at the same time the nature of the rubber 25 moulds as opposed to known designs permits the moulds to be re-used.
The strength of the reinforcement chairs is particularly due to the fact that they are cast in moulds of heat-insulating materials, and thus maintain a stable temperature during the hardening process.
Claims (5)
1. A method for production of reinforcement chairs in concrete for use in steel-armoured concrete structures, characterized in that the reinforcement chairs are cast in a mould of a material which is elastic, preferably a two-component rubber mass, and that after hardening the reinforcement chairs are removed by elastically bending the mould's wall parts.
2. A method according to claim 1, characterized in that the reinforcement chairs are cast in a mould which is formed by casting the mould walls in a box, in which there are provided one or more models, e.g. plaster models of the reinforcement chairs.
3. A mould for use in production of reinforcement chairs according to claim 1, wherein the mould has walls adapted to the shape of the reinforcement chairs, characterized in that it is made of an elastic material, especially a two-component rubber mass.
4. A mould according to claim 3, characterized in that there is provided a releasable-metal rod perpendicularly through the mould's wall parts, for the production of through-going mounting holes in the reinforcement chair.
5. A mould according to claim 3, characterized in that it is designed for casting several reinforcement chairs ata time.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO940755A NO179291C (en) | 1994-03-04 | 1994-03-04 | Reinforcement chairs in molded concrete |
| CA002219825A CA2219825C (en) | 1994-03-04 | 1995-05-26 | A method for production of reinforcement chairs and a mould for use in the production |
| EP95921174A EP0833727B1 (en) | 1994-03-04 | 1995-05-26 | A method for production of reinforcement spacers and a mould for use in the production |
| PCT/NO1995/000082 WO1996037351A1 (en) | 1994-03-04 | 1995-05-26 | A method for production of reinforcement chairs and a mould for use in the production |
| FI974324A FI974324A (en) | 1994-03-04 | 1997-11-25 | Process for producing reinforcement support and form for use in the process |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NO940755A NO179291C (en) | 1994-03-04 | 1994-03-04 | Reinforcement chairs in molded concrete |
| CA002219825A CA2219825C (en) | 1994-03-04 | 1995-05-26 | A method for production of reinforcement chairs and a mould for use in the production |
| PCT/NO1995/000082 WO1996037351A1 (en) | 1994-03-04 | 1995-05-26 | A method for production of reinforcement chairs and a mould for use in the production |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2219825A1 CA2219825A1 (en) | 1996-11-28 |
| CA2219825C true CA2219825C (en) | 2001-05-22 |
Family
ID=27170507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002219825A Expired - Fee Related CA2219825C (en) | 1994-03-04 | 1995-05-26 | A method for production of reinforcement chairs and a mould for use in the production |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0833727B1 (en) |
| CA (1) | CA2219825C (en) |
| FI (1) | FI974324A (en) |
| NO (1) | NO179291C (en) |
| WO (1) | WO1996037351A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2522018A1 (en) * | 1975-05-17 | 1976-12-02 | Paech Peter | Concrete structure reinforcing elements spacer - incorporating cement-content base, and connecting element shaped to fit reinforcement |
| DE2540065A1 (en) * | 1975-09-09 | 1977-03-17 | Fritz Koehlmann | Dowel plugs for concrete steel reinforcing mesh laying - are clamped or clipped and adjustable, with meshes laid round them |
| DE2846391A1 (en) * | 1978-10-25 | 1980-05-08 | Dasag Deutsche Naturasphalt Gm | Concrete block vibratory mould - has rubber lining on bottom supporting surfaces of outer frame and partitions |
-
1994
- 1994-03-04 NO NO940755A patent/NO179291C/en unknown
-
1995
- 1995-05-26 CA CA002219825A patent/CA2219825C/en not_active Expired - Fee Related
- 1995-05-26 EP EP95921174A patent/EP0833727B1/en not_active Expired - Lifetime
- 1995-05-26 WO PCT/NO1995/000082 patent/WO1996037351A1/en active IP Right Grant
-
1997
- 1997-11-25 FI FI974324A patent/FI974324A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| FI974324A0 (en) | 1997-11-25 |
| EP0833727A1 (en) | 1998-04-08 |
| NO940755L (en) | 1995-09-05 |
| NO179291C (en) | 1996-09-11 |
| WO1996037351A1 (en) | 1996-11-28 |
| CA2219825A1 (en) | 1996-11-28 |
| NO940755D0 (en) | 1994-03-04 |
| FI974324A (en) | 1997-11-25 |
| EP0833727B1 (en) | 2000-10-04 |
| NO179291B (en) | 1996-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |