FR2511757A2 - PIPE TO BE INSTALLED IN THE FLOOR OF A FLOOR AND IN PREFABRICATED ELEMENTS - Google Patents

Abstract

THE INVENTION RELATES TO A PIPE TO BE LAYED IN THE SCREED MATERIAL OF A FLOOR AND IN PREFABRICATED ELEMENTS. THIS PIPE IS MADE OF A FLEXIBLE OR RIGID PLASTIC MATERIAL OR OF A METAL AND IS INTENDED TO CARRY A HEAT TRANSFER FLUID (HEATING OR COOLING AGENT). IT HAS A SQUARE SECTION AND ROUNDED CORNERS AT THE TRANSITIONS BETWEEN THE INTERNAL AND EXTERNAL FACES OF ITS WALLS IN ACCORDANCE WITH THE MAIN PATENT. THE INTERNAL FACES 24 OF ITS FOUR WALLS PRESENT THICKNESSES 26 WHICH EXTEND WITH THEM IN THE LONGITUDINAL SENSE. THIS PIPE CAN BE USED IN AN UNDERGROUND HEATING PLANT.

Description

The present invention relates to a flexible plastic pipe

  or rigid or metal, to be placed in the floor screed material and in prefabricated elements and intended to carry a heat transfer fluid (heating or cooling agent), section

  square with rounded corners at the level of

  between the internal and external faces of

  its walls, contrary to the main patent

pal.

  To manufacture a heating system

  In the soil, pipes are laid on the ground, in one direction and the other, in a serpentine pattern, according to a determined and calculated scheme, and they are covered

  then screed material can also be

  hoses in prefabricated elements or

  on these An example of such a prefabricated element

  what is the mounting plate described in the patent

  German No. 2,720,361 The pipe described in the

  main vet has a square cross section A

  square section pipe satisfies optimally

  male to the various requirements imposed upon him.

  It must, for a small section, present the largest possible area, it should if possible not be sinking, which would shrink its internal section over time and it must be

  mechanically stable and despite this, suffi-

  flexibility, etc. Stabilization requirements

  on the one hand and flexibility on the other

  are contradictory. The mechanical stability

  that the moment of resistance of the pipe can be improved simply by increasing the thickness of its wall To the inconveniences due to the fact

  that the consumption of material and the weight

  A further disadvantage of this is that the flexibility of the pipe decreases. However, laying the pipe along elbows, coils or curves requires more

strength and care.

  Practice has shown that the square pipe described in the main patent is a good compromise between the requirements imposed on it and those which partially contradict them. When laying on small radius bends, partial breakage

  However, it forms in the walls on the inside

  The purpose of the invention is to increase the mechanical stability or the moment of

  strength of the square pipe For this purpose, in accordance

  In accordance with the invention, the internal faces of the four walls of the square pipe have extra thicknesses

  which extend with them in the longitudinal direction.

  In other words, the thickness of the walls of the pipe is not uniformly increased over its entire periphery, that is to say also in its rounded corners, but selectively only in places where when laying on elbows,

  particular pressure and tensile stresses

  The pipe is only reinforced at the level of its internal and external curvatures. The overthicknesses advantageously have, in section, the shape of segments of a circle. For this purpose, the overthicknesses present their maximum height in the middle of one face of the pipe and thin out.

  towards its extremities that is to say that the thick-

  of a wall is not constant, but variable.

  According to the invention, the maximum thickness of the walls is at their center, that is to say at the places which, during the installation of a pipe along an elbow, are solicited at most. located in the middle of the inner and outer walls of the elbow, since at this point the tensile and compressive forces reach their maximum value and the forces acting in

  the wall sections being more to the ex-

  are transmitted to the walls of the pipe

  laterally in the elbow and are partially ab-

  sorbed by them According to the invention, the thick

  wall thickness is, therefore, increased only

  selectively where forces reach

  their maximum and not at all or in a

  only measures at neighboring wall areas.

  The resistance moment of the pipe is thus increased

  up to a maximum with a minimum increment

  mum of material consumption and an increase in

minimum weight.

  As explained above, the internal and external faces of the walls do not overlap

  in the corners at angles of 90, but are connected

  In this case, it has proved advantageous that the extra thicknesses are connected to their ends without breaking at the inner bends between the internal faces of the wall.

  thus places of break-up o could appear

  There are also

  detachment of the flowing liquid, which

  lead to basic depots, are avoided.

  The absolute dimensions of the overthicknesses

  according to the invention are dependent on the dimensions

  As an example, it can be specified that the maximum height of an excess thickness is of the order of 15% of the thickness of the wall of the pipe. An embodiment of the invention will be described below, by way of example, with reference to the accompanying drawings, in which: FIG. 1 is a perspective view of the pipe according to the invention and simultaneously a cross-sectional view according to line II of Fig 2;

  FIG. 2 is a simplified schematic view

  a pipe according to the invention bent in an elbow on which the bending stiffness is measured; Fig. 3 is a perspective view of an arbitrarily S-shaped pipe, and Fig. 4 is a perspective view of a

  pipe laid or inserted-in prefabricated elements.

  Fig 1 illustrates the pipe 12 with its four walls 14 These walls are connected to each other by inner bends 16 and outer bends 18 These bends form the corners Each wall 14 has an outer face 22 and an inner face 24 These faces have the extra thicknesses 26 which extend with them in the longitudinal direction of the pipe The thickness of the walls 14 is indicated by H and the maximum thickness of a

  overthickness 26 is indicated by h

  The walls 14 thus have, on their intemal faces 21, a spherical shape. In other words, the walls 14 have a height or a maximum thickness in their middle, this thickness decreasing.

  towards the sides The internal faces 24 are

  -cordent in a uniform way and without break

  at the inner elbows 16 of the corners 20.

  Fig 2 illustrates a pipe laid along a bend 28 In this bend, the inner side 30 and the outer side 32 of the pipe are biased to the maximum, that is to say they are subjected to pressure and traction In this case,

  the cross-section of the pipe according to the

  The elbow has a maximum wall thickness at its inner and outer sides 30 and 32, i.e.

outside the curvature.

  FIG. 2 also shows a schematic view of

  Bending of the pipe 12 is blocked between two fixed jaws 34 At its other end, it is slidably held between two punches 36 The punches 36 are moved in one direction or in the other in the direction of the arrows The pipe is thus bent differently, that is to say put under compression and under tension, in the bend 28 The cut taken in the plane of the line II shows that the pipe 12 presents, in the extended state unsupported as in a more or less strongly curved state, the same shape in

  than the one shown in FIG.

  forcing the inner and outer sides of the curvature of the pipe 12 is therefore sufficient to compensate for

  high pressure and tensile forces that exert

cent at this place.

  3 schematically illustrates a pipe 12 which is laid along two elbows 28 or in a S Such an S-shape frequently occurs in practice Even in tight bends or during the bending of a plastic pipe without prior heating, no place of break

  does not appear in the section according to the invention

  tion. Fig 4 illustrates a pipe 12 inserted in prefabricated elements 38 It is covered

  upwardly by a sheet 40 forming a soil on the-

  which one can walk and by a plate of matter

  plastic 42 glued on this sheet.

  With respect to a pipe with a purely square section, the pipe according to the invention still has the advantage of having a slightly larger internal surface. This improves the heat transfer from a heat transfer fluid which

flows into the pipe.

11757

Claims (4)

R E V E N D I C A TI O N S   1. Hose made of flexible or rigid plastic or metal, to be laid in the material of   screed of a floor and in prefabricated   and intended to carry a coolant   (heating or cooling agent), of   squares with rounded corners at the level of   transitions between the inner and outer faces   characterized in that the inner faces (24) of its four walls (14)   have overthicknesses (26) which extend   tooth with these in the longitudinal direction   Na 1. 2 Pipe according to claim 1, characterized in that the extra thicknesses (26) have, in cross section, the shape of circular segments.   5. Pipe according to any one of the   dications 1 and 2, characterized in that the extra thicknesses (26) have their maximum height (h) in the middle of a wall (14) of the pipe (12) and tapering towards its ends.   4. Pipe according to any one of the   dications 1 to 3, characterized in that the succesents (26) are connected at their ends without break point to the inner elbows (16) between the inner faces (21) walls (1).   5. Pipe according to any one of the   1 to 4, characterized in that the height of the malaise (h) of an excess thickness (26) is of an order of magnitude equal to 15% of the thickness (H) of a wall (14) of pipe (12).