FR2622912A1 - METHOD AND DEVICE FOR MANUFACTURING SPACERS FOR STEEL FRAMES - Google Patents

Abstract

A method and device for fabricating steel rebar spacers in reinforced concrete components is disclosed. The device for implementing this method consists of an extruder 11 extruding a profiled bar 12 supported by a plate 17, a stamping cylinder 15 comprising grooves 19 formed on its periphery 18, and cooperating with a counter-cylinder 16, the cylinder 15 applying indentations 13 between projections 14. Application in construction.

Description

The invention relates to a method and a device for

  manufacture of spacers to maintain armament

  at a predetermined distance from a shuttering surface in reinforced concrete components in the form of a concrete cement and solid bar-shaped spacer body and preferably having a triangular section, a profiled bar being first formed by an extruder from a wet mass

  containing cement and then divided into lengths of

  predetermined thickness for forming the spacers.

  In this process of the known type, a profiled bar is

  formed by the extruder from a wet mass containing

  The profiled bar is then cut into sections which then constitute the different spacers after curing the cement. For their intended use the spacers, which are preferably of triangular cross-section, are arranged with a wide side oriented towards the wall. steel frame, their edge

  longitudinally oriented towards the formwork surface.

  However, when pouring the reinforced concrete element it

  may happen that the longitudinal edge of the spacer

  It is visible on the outer surface of the reinforced concrete component after the formwork has been removed against the formwork surface because the spacer was adhered by adhesion.

  by its entire longitudinal edge against the surface of

  ge and liquid concrete could fill the back.

  The invention proposes to provide a method and a

  device for the manufacture of spacers of the type indicated

  have not had the disadvantages of this kind and

  in which the liquid concrete flows surely under the

  in spite of their support against the surface of

  frage. The invention achieves this objective by the fact that successive fingerprints are marked in the longitudinal direction of the profiled bar wet immediately its output of the extruder, which has the effect of leaving in place projections between two adjacent cavities with which the struts formed by the sections of the

  profiled bar come to bear against the surface of cof-

  frage. As a result, the longitudinal edge of the spacer that abuts against the form surface is subdivided in a simple manner into different sections and the concrete can

thus simply flow.

  Fingerprints in the wet profiled bar can be made using a rotating impression cylinder

  depending on the extrusion speed of the profiled bar.

  The cavities are thus made in a simple manner on the profiled rod extruded continuously immediately downstream of the extruder. A stamping device can be associated with

  the extruder and allows the application of

  on the wet profiled bar in the longitudinal direction of the latter. This device, which is directly associated with the extruder, makes it possible to mark successive impressions on the extruded profiled bar which is still wet in the direction

of the latter.

  The embossing device may consist of a cypress

  Rotating print liner according to speed

  extrusion of the profiled bar. Thanks to a cylinder with

  to be of this kind, it is possible to apply in a simple manner

  footprints on the profiled bar.

  It is possible to associate a counter-cylinder with the cy-

  lindre imprint, the profiled bar coming out of the extruder moving between the impression cylinder and the counter-cylinder. This passage of the profile bar between the impression cylinder and the counter-cylinder allows

  to apply fingerprints in a simple way, the counter-

  cylinder serving as support for the profiled bar during

the application of fingerprints.

  Fingerprints can be executed by the envelope

  outside of the impression cylinder and the outer casing

  re may have grooves, so that protrusions

  remain in place between two adjacent footprints after the

  tion of the profiled bar in the grooves, projections serving to support the spacer against the surface of

  formwork. It is thus possible to simply

  plaster each imprint on the profiled bar, protrusions

  remaining in place between two adjacent footprints after

  profiling of the profiled bar in the grooves of the impression cylinder, these being used as support for the spacer

against the formwork surface.

  The invention will be better understood by the description

  which follows of an exemplary embodiment shown in the accompanying drawing, in which: Fig.l schematically shows the spacers manufacturing device according to the invention;

  Fig.2 is a section along the line II-II in FIG.

  1 and 3 is a sectional representation corresponding to FIG. 2, the profiled bar used for the manufacture of

  spacers, however, having a round section.

  The device shown in the drawing serves to

  10 Spacers of this type are used to hold unrepresented steel reinforcing

  predetermined distance from a formwork surface not shown

  detailed design for reinforced concrete components in the form of a bar-shaped solid concrete and concrete fiber concrete spacer

  preferably a triangular section as

  Fig. 2. For the manufacture of the spacers a profiled bar 12 is first extruded from

  of a wet mass containing cement using an extrusion

  The profiled bar 12 is then subdivided in a manner not shown in detail into sections of predetermined length which form the spacers 10. The

  profiled bar can be cut before or after hardening

cement.

  Successive fingerprints 13 are formed on the wet profiled bar 12 in the longitudinal direction of the profile bar 12 immediately at the exit of the extruder 11, which has the effect of leaving in place projections 14

  between two adjacent footprints. As is apparent from

  2, the cavities 13 are formed in the longitudinal edge of the profiled bar 12 of triangular section, which makes it possible to arrange the spacers 10

  reinforcements not shown so that

  toises 10 come into abutment with the protrusions 14 provided in

  be the footprints 13 against the non formwork surface

  represented. Thus, the spacers are simply in

  then with the protrusions 14 which can also be of shape

  curved, against the formwork surface, so that the

  pouring tone to constitute the reinforced concrete component, can flow reliably under the spacer 10, so that the spacer 10 is embedded invisibly

  in the reinforced concrete component after stripping.

  The cavities 13 are applied by an impression cylinder 15 which cooperates with a counter-cylinder 16.

  profiled bar 12 coming out of the extruder 11 moves in

  the impression cylinder 15 and the counter-cylinder 16, so that the counter-cylinder 16 is biased during

  the application of the imprints 13 to the cylinder with

  15. The subsequent movement of the profiled bar

  12 is then carried out on a plate 17.

  The impression roller 15 makes the fingerprints

  using its outer casing 18 and has grooves

  19 in its outer casing 18, so that protrusions 14 remain in place between two adjacent cavities 13 after penetration of the portions of the profiled bar 12 in the grooves 19, these projections then serving

  supporting the spacer 10 against the formwork surface.

  The grooves 19 may have particular profiles, so that the projections 14 will have bearing surfaces of

curved shape.

  Figure 3 shows a spacer 10 of round section. Footprints 13 can also be formed

  in this round section as described previously

  protrusions 14 also remaining in place between

two neighboring prints.

  As has been indicated, the embodiment shown is an exemplary embodiment of the invention which is not limited to the latter. Many other achievements

and modifications are possible.

Claims (6)

  1.Structure manufacturing method for holding reinforcements at a predetermined distance from a form surface in reinforced concrete components in the form   spacing body made of cement concrete and mason   sif having the shape of a bar and which is preferably of triangular section, a profiled bar being first formed from a wet mass containing cement with the aid of an extruder and this being then subdivided   in sections of predetermined length forming the   its, characterized in that successive indentations (13) are formed on the wet profiled bar (12) in the longitudinal direction of the profiled bar (12) immediately at the exit of the extruder (11), which has the effect of leaving in place projections (14) between two adjacent cavities (13) with which the spacers (10) formed by the sections of the profiled bar (12) abut against the formwork surface.   2.Procédé according to claim 1, characterized in that the footprint (13) in the profiled wet bar (12) is carried out using a stamping cylinder (15). rotating according to the extrusion speed of the profiled bar (12). 3.Device for implementing the method according to   claims 1 or 2, characterized in that a device   embossing machine (15, 16) is associated with the extruder (11) and   allows to apply on the wet profiled bar (12)   successive thumbs (13) in the longitudinal direction of the profiled bar (12).   4.Device according to claim 3, characterized in that the impression device (15, 16) consists of   an impression cylinder (15) rotating according to the   extrusion rate of the profiled bar (12).   5.Device according to claim 3 or 4,   characterized in that a counter-cylinder (16) is associated with the   impression liner (15), the profiled bar (12) emerging from   the extruder (11) moving between the impression cylinder   dre (15) and the counter-cylinder (16).   6.Device according to any one of the claims   3 to 5, characterized in that the impression cylinder (15) impresses with its outer shell (18).   and grooves (19) are provided in the outer shell   (18), so that protrusions (14) remain in   between two adjacent footprints (13) after penetration   portion of the profiled bar (12) in the grooves (19), these projections acting as support for the spacer (10) against the formwork surface.