FR2839733A1 - Rain and waste water transfer system uses collector passing beneath impervious geological layer under water courses or reservoirs - Google Patents

Abstract

The transfer system, designed to carry rainwater and waste water from an originating station (SO) to a receiving treatment station (ST) under water courses (F) and reservoirs (P) uses a transfer collector (7) that passes beneath a geologically impervious layer (4) in the zone containing the water courses and reservoirs. The transfer collector (7) is made in the form of a channel with a siphon and occasional storage effect for water resulting from heavy atmospheric precipitation. It has a permanent transit conduit (17) inside it that can operate by a continuous siphon effect to carry normal levels of rainwater and waste water, with its siphon section (8) extending as far as a receiving well (11) with a section of the collector at its base and a collector (25) at a higher level for water received at the treatment station by gravity.

Description

The invention relates to a method for constructing a hydraulic system.

  of rainwater and wastewater from an origin station to a reception station such as a water treatment station and a hydraulic transit system produced by this process. Known methods and systems of this type, in particular those which involve the creation of sub-river passages or under a body of water, have the major drawback that it requires the implementation of transit channels of a specific and complicated construction for provide protection against submersion by river or body of water

  found above these transit channels.

  The aim of the present invention is to propose a transit method and system of the type indicated above, which overcomes the major drawback of state of the art, which has just been stated. To achieve this aim, a transit manifold is constructed. between the two stations, at least the portion of which is under the irrigated area is made under a waterproof geological layer of protection against

  submersion by irrigation water.

  The hydraulic transit system according to the invention is characterized in that it comprises a transit collector, at least the portion of which is under the irrigated area is constructed under a waterproof geological layer of protection against submersion by water.

irrigation.

  According to a characteristic of the invention, the transit collector comprises a collecting channel dimensioned so as to be able to constitute a transit collector by effect of siphon and occasional storage.

  waters with strong atmospheric precipitation.

  According to another characteristic of the invention, the transit collector comprises at least one permanent transit pipe extending between the two stations inside the collector channel so as to be able to operate by continuous siphon effect for the flow.

low water.

  According to yet another characteristic of the invention, the hydraulic transit system comprises a pump device for lifting the water stored in the transit collector at the level of the end of the collector portion built under the sealed geological zone, for lifting the waters stored in the

  collector after strong atmospheric precipitation.

  The invention will be described in more detail and

  other features, details and benefits of this

  these will appear more clearly during the

  explanatory description which will follow made with reference

  in the accompanying diagrammatic drawings given only to

  example title illustrating several embodiments

  of the invention and in which: - Figure 1 is a schematic view in vertical section of a hydro-geological site or a transit system according to the invention must be built; - Figure 2 schematically illustrates the longitudinal profile of a first embodiment of a hydraulic water transit system according to the invention; - Figure 3 is a sectional view of a water transit manifold according to line III-III of Figure 2; - Figure 4 illustrates another embodiment of a hydraulic system for the transit of wastewater according to the invention. - Figure 5 illustrates a third embodiment of a transit collector according to the invention. Figure 1 shows by way of example a particularly problematic site in which a rainwater and wastewater transit system must be built between a station of origin SW and a station of reception and treatment ST of these waters . The figure illustrates that between the two stations is a watercourse, in particular a river F and a body of water P. The water transit manifold from station SO and destined for station ST must then pass through a sub-river area and under a body of water and is therefore exposed to a risk of submersion by the waters of the river and this body of water. This risk is aggravated by water circulations in multiple channels of anarchic morphology and anastomosis which could exist in different geological layers of the site, such as the gypsum horizon indicated in 3 in Figure 1. Indeed, this chosen site has By way of example for exploiting the invention is characterized by a number of superimposed geological layers, such as a layer 1 of modern alluvium and a layer of old alluvium 2 above layer 3 of gypsum horizon 9 , karstic vice and aforementioned channels. Below this layer 3 is a layer of Sables de Beauchamp 4 which is distinguished by maximum tightness, a layer of marl and pebbles 5 and a layer of

coarse limestone 6.

  An essential characteristic of the invention resides in the fact that, to ensure against submergence of the collector by the waters of the river and of the body of water, advantage is taken of the geological characteristics of the terrain. According to the invention, the part of the collector passing through the sub-fluvial zone and under the body of water is constructed under the geological layer of the Sables de Beauchamp 4 since this layer, thanks to its maximum waterproofness, provides sonhaite protection against submersion. by the waters of the river, the body of water and multiple channels of anarchic morphology and anastomosis

of the gypsum horizon layer 3.

  Figure 2 illustrates the wastewater transit system between an originating station such as the SO station in Figure 1 and a treatment station such as the ST station, which includes a transit collector 7, part 8 of which is located under the river F and the body of water P passes below the waterproof geological layer of the Sables de Beauchamps 4. The system also includes a well 10 in the station of origin SO and a well 11 in the receiving station and ST. It can be seen that the well 10 of the origin station SO is connected to the horizontal part 8 of the transit manifold 7 by a portion of descending collector and inclined accordingly 13, while the horizontal collector part 8 opens directly into the well of

reception 11.

  As shown in FIG. 2 and more clearly still in FIG. 3, the manifold 7 has inside a substantially circular cross-section channel 15 in the example shown, and of a relatively large diameter, two transit pipes. 17 of a relatively small diameter compared to the diameter of the channel 15. Pipes 17 are dimensioned to ensure a permanent transit of low water while the channel 15 is designed to allow an occasional transit of water with high atmospheric precipitation by pipe forced. The collector with its channel 15 and its pipes 17 is designed for this purpose to form a system called "siphon". Thanks to its large dimensions, channel 15 also allows

  occasional storage of water from heavy precipitation.

  The collector comprises, at its entry 19 into the original station 10 and at the level of the well 11 of the treatment station, valves which allow the

  emptying of the low water transit pipes.

  The treatment station ST comprises a pump device 23 for lifting the water from the collector after a strong atmospheric precipitation to ensure the next cycle of transit and storage of the water from the collector. This pump device 23 transports the water from the receiving collector 25 located at a higher level of the receiving well 11. It can be seen that the transit pipes 17 open into this collector of

reception 25.

  In the embodiment of FIG. 2, the deeper collector part 8 4, under the river and the body of water and which serves as a storage capacity for strong atmospheric precipitation extends to the treatment station ST . In the embodiment represented in FIG. 4, the deep collector part 8 of the low water and water with strong atmospheric precipitations by siphon effect extends only over a part of the length of the collector, here-a- say up to an intermediate well 27 between the stations of origin SO and of treatment ST, the continuity of the transit of water, from well 27 to well 11 of the station of the treatment station being ensured by a gravity flow through a collector portion 29 located at a higher level. The well 27 is provided with a device for lifting the water from the collector 29. In this embodiment, only part of the strong precipitation is stored while the rest evacuated by the gravity flow from the well 27

  at well 11 and thus the treatment station ST.

  The embodiment according to FIG. 4 presents the advantages of providing an economic pumping of the storage of water with strong atmospheric precipitation, a recovery of water by gravity flow from the connection structure to the well 27. It removes the need for increase of the section of the collector between the receiving well 27 and the treatment station ST due to the presence of the pipes operating as a siphon and laid inside the collector, while preserving the same section for the flow of water with high atmospheric precipitation . This device also provides a supply economy and lays downwater transit pipes for the section between the well 29 to

the ST treatment station.

  In order for the transit system according to the invention to be able to operate, by all-siphon effect or by siphon effect plus gravity effect, the collector trace must respect certain level conditions indicated in FIGS. 2 and 4. These levels are referenced to general of France which corresponds to the sea level and wind indicated by the letter N. At the starting well 10 of the station of origin 50, the level N1 is the highest level. The part of collector 8 under the layer of Sables de Beauchamp begins at level N2 and ends at level N3 which is lower than level N2. At well 11 (FIG. 2) and at well 27 (FIG. 4) the collector 7 rises respectively to levels N4 and N5, which are lower than level N1. Then the collector 29 descends to a level lower than the level N4, to

ensure gravity flow.

  For example, the level N1 could have the dimension of + 12.80 m, the level N2 the dimension of + 3.55 m, the level N3 the dimension of +. 262 m, level N4 the height of + 6.50 m and level N5 the height of + 9.03 m. Of course these values are only given by way of example. Regarding the collector channel, for example, it could have a diameter of 4 m and the

  permanent transit pipes 17 with a diameter of 1, 2 m.

  FIG. 5 illustrates another embodiment of the wastewater transit system according to the invention, which comprises, at an intermediate well 30, the arrival of another collector 31 also comprising two transit conduits of the type of conduits 17 inside a larger diameter channel. Since the entire system operates by penstock, the starting point of the collector 31 is at level N1 and arriving at the well 30 at level N7. In this well the collector channel and the two conduits descend vertically and wind branches respectively to the collector channel and the conduits coming from the well 10 at station of origin SO and are located at level N8. After connection the collecting channel arrives at the treatment station at level N9 where the water can be pumped

at level N10.

  The collecting channel 31 could have a diameter of 2.8 m, and the pipes 32 a diameter of 1 m. After connection, the collecting channel could have, as an example, as before, a diameter of 4 m. Concerning the levels, the levels N7 and N8 at well 30 could have the dimensions respectively of + 9.03 m and - 0.09 m, the level N9 has the dimension - 2.62 m and

  level N10 has a height of + 6.50 m.

  Thus, FIG. 5 illustrates the possibility of a waste water transit system according to the invention operating by siphon effect and comprising several original wells of collector and low flow transit water and strong transit water. atmospheric precipitation.

Claims (9)

R E V E N D I C A T I O N S   1. Method for constructing a hydraulic system for the transit of rainwater and wastewater from an originating station to a receiving station such as a water treatment station, adapted to pass through an area capable of include in particular a watercourse such as a river and / or a body of water, characterized in that a lion constructs a transit collector between the origin station SO and the reception station ST of which at least the portion is located under the area comprising the watercourse and / or the water body is made under a waterproof geological layer (4), of protection against   flooding of watercourses or bodies of water.   2. Hydraulic system for the transit of rainwater and wastewater, for implementing the method according to claim 1, characterized in that it comprises a transit collector (7) of which at least the portion lying under the area comprising in particular the watercourse and / or the water body, is constructed under a waterproof geological layer (4) of protection against   flooding of watercourses or bodies of water.   3. Hydraulic system according to claim 2, characterized in that the transit collector (7) comprises a transit collector channel (15) dimensioned so as to be able to constitute a transit collector by siphon effect and occasional storage of water   heavy atmospheric precipitation.   4. Transit collector according to claim 3, characterized in that the transit collector (7) comprises at least one permanent transit pipe (17) extending inside the collector channel (15) so as to be able to operate by continuous siphon effect   for the drainage of low water and waste water.   5. Transit collector according to claim 4, characterized in that the portion (8) of transit by siphon effect of the transfer collector (7) extends to a well of arrival (11, 27) comprising at its based on the arrival of the collector portion (8) and, at a higher level, a collector (25, 29) for the transit of water received by gravity at the treatment station (ST). 6. Transit system according to claim 5, characterized in that the inlet well (11, 27) of the transit collector by siphon effect comprises a lifting pump device (13) of the water stored in the collector after a strong atmospheric precipitation at the collector (25, 29) of transit by gravity effect. 7. Transit system according to one of   claims 4 to 6, characterized in that the well   (11) is located in the receiving station and treatment (ST).   8. Transit system according to one of   claims 4 to 6, characterized in that the well   arrival point (27) is at an intermediate location between the originating station (SO) and the reception and processing (ST).   9. Transfer system according to one of the   Claims 3 to 5, characterized in that it comprises   at least a second original collector (31) connected to the precise transit collector (7), at the bottom of a well appropriate (30).