FR2467367A3 - PREFABRICATED BEAM ELEMENT FOR SELF-SUPPORTED FLAT OVENS OF TUNNEL TYPE FURNACES - Google Patents

Abstract

The invention relates to beam elements which comprise a central part or internal metallic tubular reinforcement, generally H-shaped, having airtight walls completely surrounded by a heat-insulating substance, so as to use this central part not only as a support and reinforcement but also as a duct of a refrigeration system provided outside. The beam elements 1, 1 'have a substantially inverted T-section comprising a lower base 2 and a central passage comprising a relatively thin metal foil 4 and surrounded by a sheath 5 of insulating material. The sheath 5 generally made of ceramic flakes or rock wool keeps the sheet 4 separate from the refractory concrete constituting the body of the elements 1, 1 'connected to each other by an expandable joint 7. Application to kilns for firing bricks and products ceramics. (CF DRAWING IN BOPI)

Description

The present invention relates to an element

  of prefabricated beam for self-supporting flat vaults

  carrying tunnel furnaces, in particular, for firing bricks and ceramic products or used in the field of iron metallurgy. In the prior art, tunnel-type furnaces are known having a flat roof or vault, in particular of the self-supporting type as described in FIG.

  French Patent No. 75 21 748. This roof or roof

  takes several rectilinear beams placed transversely

  in relation to the supply of the substance to be cooked and resting at their ends on the side walls of the tunnel. Each beam comprises a central portion or internal metal tubular reinforcement, generally H-shaped, having sealed walls

  in the air completely surrounded by a thermo-

  insulation, so as to use this central part not only as support and reinforcement but

  also as a conduit of a refrigeration system

ration planned outside.

  Although in accordance with the patent mentioned

  above, each beam may consist of a number of refractory beam members which are interconnected by expandable joints,

  beams of this type have so far been manufactured

  by means of a single casting of refractory concrete (having different characteristics according to the temperatures to which it must resist) around the internal reinforcement already covered with an insulating sheath,

  preferring, however, to separate the casting in

  sieurs transverse elements, and then connect them together by extensible joints. This naturally has the disadvantage of producing, storing, handling and transporting beams at the installation site.

  lengths and widths that can reach

  3m and over, with the risk of breaks and cracks in the finished product and defects in the beam contour during casting and baking

following.

  On the other hand, it is unthinkable that single beam elements are each manufactured having internal reinforcement and an insulating sheath since it would be extremely difficult and expensive to connect the various elements of H beams together. The object of the invention is to provide an element

  of prefabricated beam not presenting the disadvantages

  mentioned above, since it may be

  slid around the metal central core at the location of the tunnel furnace installation in sufficient number to obtain the required length for the beam. In order to allow this sliding, each beam element comprises a longitudinal passage comprising four metal sheet walls surrounded by a

  sheath of an insulating material. The purpose of the sheet

  dull is to reduce the friction with the central body

  metal tral, usually an iron H beam

  walls, during the assembly of the elements of

  prefabricated or on the central body for the assembly.

blage of a beam.

  The advantage of producing smaller, simpler items translates into more accurate production and lighter weight. Also, the problems of transport and handling are reduced, with less dangers

  cracks and breaks and the possibility of

  to manufacture these elements on a large scale

  varied standard lengths, which makes it possible to

  to hold beams having the desired dimensions, by simply appropriately choosing the number and size of elements to be mounted on a given length of an H-beam. Other advantages and features of

  the invention will emerge from the description

  The following detailed description of an embodiment given by way of non-limiting example with reference to the accompanying drawings, in which: - Figure 1 is a sectional view of a beam element according to the present invention; and FIG. 2 is a perspective view of two elements of FIG. 1 mounted one beside

  the other on a metallic central part of

is lying.

  In FIG. 1, the beam element 1 conforms

  The invention has a substantially inverted T-cut having a lower base 2 and a central passage 3 having a relatively thin metal sheet 4 and surrounded by a sheath 5 of insulating material. The sheath 5, generally made of ceramic flakes or rockwool, keeps the sheet 4 separate from the concrete

  refractory constituting the body of element 1.

  The beam element 1 can thus be easily manufactured by casting a concrete having the desired refractory properties in a mold of suitable size, around a tubular element of iron sheet, preferably of quadrangular section, which has been covered with an insulating sheath made of

example of ceramic fibers.

  In FIG. 2, it can be seen that these beam elements are easily mounted simply by sliding around a central part 6 which, as already indicated, serves not only as a support beam but as

  also forms a refrigeration system duct.

  The sliding of each element 1, 1 'on the central body

  tral 6 which is preferably made of a H-beam with closed tubular walls, and made much easier

  by the reduced friction between the central part 6

  forced and the metal foil 4.

  It suffices, then, to make a suitable number of elements 1, 1 ', and so on. with intermediate expandable joints 7 around a central body

  reinforcement 6 having the desired length, corresponding to

  spanning the width of the tunnel-type kiln built, to have the beam completed ready to be mounted and

  connected to the refrigeration system. By choosing

  different standard dimensions of beam elements to be manufactured on a large scale and to be stored,

  it is possible to obtain oven beams of different

  lengths simply by combining a number of the elements together even though they have lengths

different.

  It is understood that many additions

  and modifications may be made by special

  in the embodiment just described for illustrative purposes only, without departing for

  neither the framework nor the spirit of the invention.

Claims (3)

  1. Prefabricated beam element for self-supporting flat vaults tunnel type ovens having a substantially inverted T-shaped cross-section, and made of refractory concrete, characterized this street this element comprises a central passage (3) formed by a metal sheet tubular (4) with relatively thin walls surrounded by an insulating sheath (5) in contact direct with refractory concrete.   Beam element according to Claim 1, characterized in that the tubular metal sheet (4) has a quadrangular cut.   Beam element according to claim 1,   characterized in that the insulating sheath (5) is killed by ceramic fibers.