FR2791713A1 - Thermoplastic duct component has twin extruded walls - smooth inner wall and outer corrugated one - Google Patents

Abstract

The duct component (1) has a U-shaped cross-section with vertical side walls having upper edges shaped to receive a grid. The extruded side walls are double, comprising a smooth inner rigid wall (2) and an outer wall (4) with corrugations or ribs running vertically on the sides of the duct and shaped to form a sole (5) beneath it with reinforcing ribs (16) and spacers (17) at the sides.

Description

The present invention relates to a channel element with variable section

  depending on the flow of water, or for buried cable trays, obtained by extruding at least one thermoplastic polymer of the PVC, ABS, Polypropylene type. Such a channel element is commonly used for drainage in building and public works or for burying cables along

lines of communication.

  It also relates to the process for obtaining such an extrusion.

channel element.

  For the realization of drainage channels, use is most often made of concrete channel elements or polymer concrete of "U" shape which are mutually aligned by their end faces, and whose branches which

  extend vertically, serve as support at the top for a grid.

  Such elements have a certain number of drawbacks inherent in their constitution: they prove to be slow to manufacture due to their technique of manufacturing by molding of unit parts, their high weight implies a limitation of their length because, otherwise , they would be difficult to implement on the ground. Finally, the multiplicity of elements required for the realization of the drainage conduit or the cable tray poses sealing problems for the

  connections between the different elements.

  These drawbacks significantly increase the cost of the pipe installed on the site and especially when it comes to making a drainage channel with a slope to compensate for the absence of a natural slope of the soil. In fact, in this case, a whole series of channel elements should be provided, of the order of 20 to 30 pieces having different heights, in order to obtain a slope of flow at the bottom of the channel while the surface of the floor is flat. The large number of parts required implies for the manufacturer the production of a whole series of molds and the

  storage of a large number of different parts.

  In European patent EP 206 996, an effort has been made to reduce the number of channel elements required for obtaining a water flow slope, by the addition of risers on the end of the lateral branches. vertical of the channel in "U". The fact remains that if these extensions are easier to manufacture than the channel elements in "U", they still require a whole set of parts of different height with all the disadvantages

previously cited.

  - 2- In PCT patents WO 90/11405 and US 5,735,637, a flow slope was recreated by resting the gutter on a metal frame forming an adjustable hanger or seat. But this type of implementation involves a delicate linkage to implement and adjust which increases the cost of the

final product.

  The present invention aims to remedy these various drawbacks and makes it possible to obtain a channel element made of thermoplastic material, buried, rigid, which can be manufactured in great length but which nevertheless remains easy to handle due to its lightness. According to another object of the invention, such a channel element used for drainage avoids the multiplicity of parts required to create a slope for the flow of water and reduces the risk of leakage at

  level of the junction between elements.

  To this end, it relates to an extruded channel element made of thermoplastic material with variable section according to the flow of water, or for buried cable tray, of "U" shape whose branches which extend vertically

  receive on their ends a metal rabbet holding a grid.

  The channel element is characterized in that the body of the channel consists of at least one rigid corrugated or ribbed wall, the rings being arranged vertically over at least part of the height of the branches of the channel and with the exception of 'A bearing zone forming the sole of the channel element. These corrugations reinforce the branches of the gutter and participate in the increase of the mechanical resistance required so that the gutter, once buried and drowned in a concrete bed, can withstand the stresses generated at

  from the surface of the ground by rolling vehicles.

  According to a preferred embodiment of the invention in the case of a drainage channel, the body of the channel comprises a double wall, namely a rigid rigid wall in "U" shape for the flow of water, integral with a corrugated, corrugated or ribbed wall, the corrugations being arranged vertically over at least part of the height of the outer branches of the gutter and with the exception of a support zone forming the sole of the gutter. This gives a particularly light and resistant channel element which combines the functions

  mechanical and hydraulic sought.

  According to another characteristic of the invention, a bearing zone forming a sole for the channel element extends under the entire length of the body devoid of corrugations and cleaning with the lower walls of the vertical branches of said body two lateral dimples. This arrangement favors a good foundation of the gutter when it is placed in a trench and its maintenance in a concrete bed trapping the projecting ends of the

support area.

  After annealing, the vertical walls of the branches of the channel element are cut longitudinally so that the required height of the two branches is equal or different between the inlet and outlet ends of the channel, as the case may be. In the case of a desired slope, a difference of 0.5 to 0.8% will be provided between the entry and exit heights of the gutter so that once the ends of the branches are adjusted to the level of the soil, the flow channel

  entrains the liquids carried towards an evacuation outlet.

  According to yet another characteristic of the invention, the upper end of the vertical branches of the channel element is covered with a longitudinal metal rebate in "h" which stiffens this part and maintains the surface grid. This rebate can be wavy on at least one of its lower wings and take up, over a certain height of vertical branch, the buckling forces induced by the mechanical stresses of the product in situ. It can also be of the conventional type and then pinches the upper end of the vertical branch and enclose by a longitudinal fold the projecting parts towards the outside of the corrugations. The process for obtaining a channel element as previously described is characterized in that it uses a closed profile substantially of oval shape, provided in the upper and lower part with an adjacent bearing zone forming the sole of the gutter. The assembly is obtained by extrusion, then ringed at the outlet of the extruder using a caterpillar on at least part of its lateral sides, then cut longitudinally into two identical channel elements for a flow without slope, or complementary for a

  slope flow in a complete system.

  - 4 - We thus obtain in a continuous extrusion operation two long corrugated sections (several meters) which can then be cut

  transversely to the desired dimensions.

  Longitudinal cutting can be carried out continuously by any suitable means and in particular by a saw cut thanks to a control of the cutting saw as a function of the profile extrusion speed. It is thus possible to continuously provide for the production of channel elements whose branches have a constant height, the saw then being fixed. However, it is possible to provide for a lateral displacement of the latter from a central position on the closed profile to an optimal position to the right or to the left of the closed profile if this profile is extruded in a horizontal manner, or to a higher optimal position or lower if this profile is extruded vertically. The speed of movement of the longitudinal saw controlled by the speed of pulling the closed profile then characterizes the

  slope of the complete slope channel system.

  Other details and advantages of the invention will appear on reading which will follow from a nonlimiting example of the invention referring to the appended drawings among which - FIG. 1 is a perspective view of a channel element of drainage according to the invention, - Figure 2 is a side view of a corrugated rebate, - Figure 3 is a section along AA of Figure 2, - Figure 4 is a section of a conventional rebate , - Figure 5 is a section of a closed profile extruded and corrugated before the longitudinal cut, - Figure 6 is a perspective view materializing the longitudinal section allowing the obtaining of two gutter elements without slope, - Figure 7 is a view identical to FIG. 6 but for obtaining two

sloped channel elements.

  - 5 - - Figure 8 is a representation of a complete gutter system with

  slope made up of gutter elements according to the invention.

  The extruded channel element 1 shown in Figure 1 is intended for the production of a buried drainage channel. It is substantially in the form of a U-shaped conduit constituting the body 1 of the gutter whose branches 2-2 'extend vertically, and whose bottom 3 is arched. The branches 2-2 'are smooth but coated externally with corrugations 4, namely corrugations, which are arranged vertically over part of the height of the external faces of said branches. These corrugations are open at the top and closed at the bottom to take account of manufacturing constraints. However one

  could without making novation plan to open or close these ends.

  The sole of the gutter consists of a support zone 5 which extends under the entire length of the bottom 3 devoid of grooves and serves as a seat for the gutter in the bottom of the trench. This base plate forming the sole 5 consists of two projecting ends 6-6 'each comprising a wall extending obliquely from below the lower part of the vertical branches 2-2' from the "U" to a horizontal wall 7 forming a support on the ground. These ends 6-6 'provide with the lower parts of said vertical branches two lateral recesses 8- 8' which, after pouring and solidification of concrete in the trench around the gutter, serve to firmly hold the latter and to prevent any displacement due to it stresses generated from the ground surface

  by the passage of vehicles in particular.

  In order to stiffen the support area of the gutter, spacers 9-9 'are provided connecting the bottom 3 of the gutter to the horizontal wall 7 of ground support. However, it could also alternatively and as shown in FIG. 5, envisage a massive support zone forming a sole 5-5 ′, that is to say not partitioned internally, with however the drawbacks inherent in the cost of matter

additional required.

  The channel which is obtained by extrusion of a thermoplastic material, PVC in the present example, receives in a manner known per se on the upper edges of its branches a metal rebate 10 for holding a surface grid. This "h" shaped rebate is obtained by folding a metal sheet. It can be corrugated on at least one of its lower wings 11 as shown in FIGS. 2 or 3, and then take up on a certain surface of the adjacent vertical branch 2-2 ′ the buckling forces induced by the mechanical stresses of the product in situ. It can also be and as

  shown in Figures 1 and 4, of conventional type, that is to say without ripple.

  In this case, it pinches the upper end on the duct side of the adjacent vertical branch and encloses the projecting parts towards the outside of the rings 4-4 '. To this end, the lower end of the grooves on the rebate 10 is provided with

  a longitudinal fold 12 avoiding any accidental extraction after installation.

  For the manufacture of a channel according to the invention, use is made and as shown in FIG. 5, of a closed profile 13 substantially of oval shape and provided in the upper and lower part with a support zone forming a sole. -5 'adjacent. Profile 13 with adjacent flanges 5-5 ′ is obtained by extrusion of PVC, then corrugated at the outlet of the extruder using a track on at least part of the lateral sides of the profile. The profile is then cut longitudinally as shown in Figures 5 to 7, into two elements of

  channel 14-14 'which are then cut transversely to the desired length.

  The longitudinal cutting can be carried out by any means suitable for thermoplastic materials. In the present example, a saw was used.

  (not shown) controlled by the profile extrusion speed.

  In FIG. 6, the saw cut is made parallel to the planes of the two bearing zones forming the sole 5-5 ′. We then obtain two channel elements 14-14 'without slope since the vertical branches have a constant height. In FIG. 7, the saw line is made obliquely with respect to the planes of the two bearing zones forming the sole 5-5 ′, that is to say that the saw moves laterally from a middle position to a position optimal lateral. The slope thus produced results from the difference in height between the ends of the inlet branches E1 and outlet E2 of the gutter and as soon as these vertical branches

are flush with the surface of the ground.

  -7 - There is shown in Figure 5 the traces B-B and C-C of the cut lines respectively in optimal and median position corresponding to the heights

  extremes and means of two coupled channel elements (a-a ', b-b' ,.

  h-h ') represented in linear position in a complete system of slope channel according to FIG. 8. The linear of a length L of such a system of slope channel is thus made up of elements coupled in pairs such that a-a ', b-b',

  c-c ', ... and up to h-h' in this example.

  When the longitudinal saw moves from the central position CC to the optimal position BB and when the two separate elements constituting the closed profile are cut transversely in standard length, a linear recompose is added by adding the elements coupled according to FIG. 8 of slope gutter made up of unit elements "a" to "h" on the first half L / 2 of

  linear and "h" 'to "a"' on the second half of the same linear.

  It goes without saying that the invention is not limited to the example of embodiment of the above-mentioned element; on the contrary, it embraces all variants of execution. Thus the interior surface could have a hemi-elliptical section, or one could use a combination of different thermoplastics, or even for certain layers with the use of

recycled plastic.

-8 -

Claims (10)

  1) Extruded channel element in thermoplastic material with variable section according to the flow of water, or for buried cable tray, "U" shape whose branches which extend vertically receive on their ends a metal rabbet holding d '' a grid, characterized in that the body (1) of the gutter consists of at least one rigid, corrugated or ribbed wall, the grooves (4-4 ') being arranged vertically over at least part of the height of the branches 2 -2 'from the gutter and with the exception of a support zone forming   sole 5-5 'of the channel element.   2) channel element according to claim 1, characterized in that the body (1) of the channel comprises a double wall, namely a smooth, rigid wall, in "U" for the flow of water, integral with a wall corrugated, wavy or ribbed, the rings (4-4 ') being arranged vertically over at least part of the height of the outer branches (2-2') of the gutter and with the exception   1 5 a bearing zone forming the sole (5-5 ') of the channel element.   3) Channel element according to claim 1 or 2, characterized in that a bearing zone forming the sole (5-5 ') of the channel element extends under the entire length of the body (1) devoid of 'rings (4-4') and forms with the lower walls of the vertical branches (2-2 ') two lateral recesses (8-8 ').   4) Channel element according to claim 3, characterized in that the bearing zone forming the sole (5-5 ') consists of two projecting ends (6-6') each comprising a wall extending obliquely from below the lower part of the vertical branches (2-2 ') from the "U" to a horizontal wall (7) forming support on the ground.   ) Channel element according to claim 3 or 4, characterized in that spacers (9-9 ') connect the bottom (3) of the channel to the horizontal wall (7) ground support.   6) channel element according to any one of claims 1 to 5,   characterized in that the upper end of the vertical branches (22 ') is covered with a longitudinal metal rebate (10) in the shape of an "h" which is   wavy on at least one of its lower wings (11). 9-   7) Channel element according to claim 6, characterized in that the longitudinal metal rebate (10) pinches the upper end of the vertical branch (2-2 ') and grip the projecting parts by a longitudinal fold (12)   to the outside of the rings (4-4 ').   8) Method for obtaining a channel element according to any one of   previous claims, characterized in that it uses a profile   closed (13) substantially oval in shape, provided at the top and bottom   an adjacent support zone forming the sole (5-5 ') of the gutter.   9) Method for obtaining a channel element according to claim 8, characterized in that the closed profiled assembly (13), bearing zone forming sole (5-5 '), is obtained by extrusion, then ringed at the outlet of the extruder using a track on at least part of its lateral sides, then cut longitudinally into two channel elements (14-14 ') which are then cut   transversely to the desired length.   ) Method for obtaining a channel element according to claim 9, characterized in that after longitudinal cutting, the branches (2-2 ') of the two   channel elements (14-14 ') have a constant height.   11) Method for obtaining a channel element according to claim 9, characterized in that a saw is controlled by the speed of extrusion of the closed profile (13) and moves laterally from a middle position (CC) towards a optimal position (B-B).   12) Method for obtaining a channel element according to claim 9 or 11, characterized in that after longitudinal cutting, the branches (2-2 ') of the two channel elements (14-14') have a difference height between   their inlet ends (El) and their outlet ends (E2).