FR2728292A1 - Prefabricated storage station for dirty water, rain water or industrial water - Google Patents

Abstract

The storage facility has a tank (10) with provision for several inlet pipes (50) and one outlet pipe (70) which is higher than the inlet pipes. The tank has an access hatch (31) at the top. Below the entry pipes there is a submerged pump (61) and a non-return valve (65). Inside the tank there is a closed chamber (20) which holds the non-return valve and which has a hatch (32) on the outside. The chamber occupies a small area of the upper part of the tank. Once the equipment is housed in the chamber, it is protected from water and liquid or gaseous effluent. It has a watertight cover. The chamber also has a sloping floor (22) for draining condensation.

Description

 The present invention relates to a prefabricated discharge station for wastewater, rainwater or industrial water, into which one or more inlet pipes open, and from which one or more outlet pipes exit, located at a level higher than the previous ones, and containing at least one pump.

 Known stations of this kind, such as that described in the French patent document FR-A-2 254 521 allowing the raising of wastewater, co-comprise a single chamber which encloses all of the hydraulic equipment.

 The apparatus described in the patent document mentioned above structurally has a concrete tank into which an inlet pipe and an outlet pipe raised compared to the previous one, due to the purpose of a discharge station which is to make the flowing liquid gain height.

 At the bottom of the tank is a submerged pop communicating with the outlet pipe. A hatch arranged on the cover per-it to descend the target from a bracket disposed nearby in order to be able to maneuver vertically the poppy in order to carry out control and maintenance operations. The outlet pipe is provided with a non-return valve, intended to prevent an untimely return of the fluid against the direction. bubble is also united with a valve allowing it to be closed during maintenance operations for the same reasons.

 Functionally, the stern sucks intermittently in order to maintain the level of liquid coming from the inlet pipe between a "high" level slightly lower than that of the entry pipe, and a slightly "lower" level higher at the top of the submerged pump suction.

 However, this wastewater lifting device is not entirely satisfactory and has a number of drawbacks which will be listed.

 Firstly, access to hydraulic equipment, such as the valve, valve and pamper, is difficult and dangerous for a human operator. Indeed, such a post can reach a great depth, hence the risk of falling for the operator. In addition, a number of stagnant gases can be particularly hazardous, in particular hydrogen sulfide. Finally, depending on the height of liquid and sediment, the operator is subject to the risk of drowning or slipping. The supply line can also serve as a path for rats whose bite can be lethal.

 Second, stagnant gases can be corrosive to emerging metal equipment, such as pipes, valves, valves, etc.

 Third, we imagined offset boxes containing the aforementioned valves. However, in this solution, in addition to the increase in the footprint and the additional cost thus generated, in particular for the roofing system, the overhang creates an imbalance which causes difficulties in letter-up the structure well vertically. In addition, it is practically impossible to compact the materials used for backfilling under this overhang, thus causing poor stability in the soil and risks of rupture due to differential settlement.

 The object of the invention is therefore to overcome these various problems and therefore to propose a delivery station which allows simple, clean and safe access to certain hydraulic equipment and to integrate them into a single volume so as to guarantee good stability. geotechnical and less land use.

 To this end, a discharge station according to the invention is of the prefabricated type and consisting of a tank designed to receive one or more inlet pipes and an outlet pipe at a level higher than those of the inlet pipes, said tank being provided in its upper part with care an access hatch, said tank being designed to accommodate, on the one hand, a level lower than that of the inlet pipes, at least one submerged laying, and, on the other hand, at least one non-return device.

 According to a characteristic of the invention, said tank has inside a closed chamber provided for housing said one or more non-return equipment and opening out through an access hatch.

 According to another characteristic of the invention, said chamber occupies only a part of the upper part of the tank.

 According to another characteristic of the invention, said chamber, once said one or more non-return equipment fitted, is sealed and isolated from the arrival of liquid or gaseous effluents which may come from the rest of the tank.

 According to another characteristic of the invention, under said hatch, said valve chamber is closed by a tight cover.

 According to another characteristic of the invention, said valve chamber is provided with a sloped slab and equipped with a device for the evacuation of condensation water.

 According to another characteristic of the invention, said tank is provided with an opening at the top making it possible to view, ester and lower the pumps, the screen basket and the level switches directly from the ground, without the need to descend into the tank.

The characteristics of the invention mentioned above as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the attached drawing, in which the
Fig. a single is a sectional view of the delivery station according to the present invention.

 The delivery station shown in FIG. single consists of a prefabricated cylindrical tank 10, delimited by a cylindrical side wall 11, a flat bottom 12 truncated on its periphery by inclined walls 13 and 14, a cover 30 provided with two access hatches 31 and 32. The vertical cylindrical side wall 11 has a reinforcement thickness 18 and, at its base, is provided with a flange 15 reinforced by gussets 16. The flange 15 is used for fixing the post to a concrete base 41 using pulls -funds 17. The cylindrical wall 11 can be made on a composite material structure comprising two layers of reinforced polyester enclosing a central layer made of silica and resin, and protected externally and internally by a finishing layer.

 The interior of the tank 10 is of cylindrical section. A specific compartment 20 is provided in its upper part. Said compartment 20, which we will call valve chamber 20, is delimited laterally by the side wall 11 of the delivery station as well as by a vertical partition 21 passing through the axis of the tank 10. The valve chamber 20 is delimited at its lower part by a slab 22 having a slight slope at the bottom of which is a device 23 for isolating and discharging the condensation water. The device 23 is an odor trap or a valve. The chamber 20 is delimited at its upper part by a neck 27 delimiting a manhole and supporting a cover 24 provided with a seal 25 and a handle 28. Said seal 25 is located between said neck 27 located at the upper part of the chamber 21 and the side of the neck 29 ending the flat bottom of the cover 24. The cover 24 of the valve chamber 20 is located under one of the access hatches 32 with which the cover 30 of the delivery station. The cover 30 and the hatch 32 are arranged so as to allow the removal and positioning of the cover 24, as well as the easy passage of a human being brought down into the valve chamber 20. Said chamber & valves 20 must therefore be of a height accordingly, and can support in its wall 11 a ladder 20a.

 The interior of the tank 10 apart from the valve chamber 20 described above is occupied by another compartment 19 which we will hereinafter call the pump chamber. Said pump chamber 19 therefore occupies the entire lower volume of the tank 10 up to the level of the raft 22 of the valve chamber 20, and half of the upper volume of the tank 10, and is diametrically separated from the chamber & valves 20 through the flat wall 21. The pump chamber 19 can communicate with the outside via the access hatch 31.

 The tank 10 is buried in the ground and is anchored on the concrete footing 41. A concrete ballast 42 can be provided, in particular in the presence of water in the ground, in order to ensure stability when empty and to reinforce the lower part of the book. It can be achieved by means of prefabricated ferrules. in concrete, with an inner diameter greater than that of the tank previously lowered nor.al-ent or by cutting, then completed by filling with concrete poured into the space left free between the two walls. The surrounding terrain 40 is in contact with the middle and upper part of the station. The cover 30 is in the same plane as the roadway, the sidewalk, the courtyard, or any other surface 43.

 An inlet pipe 50 opens into the wall 11 of the pump chamber 19. Its end opens onto a screen basket 51 which is mounted integral with a vertical rail 53 so that it can be moved vertically using a target 52 in order to effect its periodic cleaning or its change.

 A discharge pipe 70 crosses horizontally the wall 11 of the valve chamber 20. It is supplied by several pipes 60 meeting at a tee 62 located in the valve chamber 20. Said discharge pipe 70 is raised relative to the pipe feed 50.

The lower end of each pipe 60 is connected by a flange or fitting 60b to an elbow 60a resting on a cradle 64 disposed at the lower end of the pump chamber 19. The elbow 60a and the cradle 64 form a foot d 'seated. The elbow 60a is provided with an automatic latching system 63 of a pump 61. The pipes 60 are vertical and parallel to each other. Only one of them 60 is visible in the figure.

 The pipe 60 passes vertically through the slab 22 of the valve chamber 20. This pipe carries in said valve chamber 20 a non-return valve 65 surmounted by a flange 65a, preventing the untimely arrival of liquid from the outlet. Finally, it is connected horizontally to a tee 62 via a valve 67.

 Any interventions on the valve 67 and the non-return valve 65 of each pipe 60 therefore justify the possibility of access by a human operator in said valve chamber 20. The pump 61, normally snapped at the end of the pipe 60 via the automatic latching system 63, can be moved vertically along a guide rail 68. To do this, the pump is fixed to a cable 81 secured to a removable bracket 80 which is placed in a suitable cavity 33 arranged in the cover 30 of the tank 10. Two liquid level sensors 69a and 69b are provided for controlling the pumps 61.

 It should also be mentioned that a patent document such as EP-A-611 269 presents a submersible pump which can slide on guide rails and positioned in a sewer sump.

 The pipes 50, 60 and 70 are respectively provided with seals 54, 66 and 71 when they respectively pass through the wall 11 of the pump chamber 19, the slab 22, the wall 11 of the valve chamber 20.

 From seed that the screen basket 51 and each pump 61, these sensors 69a and 69b can be manipulated and observed from the surface during control and maintenance operations.

 An electrical cabinet 90 is disposed on the surface on the cover 30. It contains the elements necessary for controlling the operation of the pumps 61 and of the sensors 69a and 69b.

 After presenting the delivery station and its equipment, we will examine its operation. The wastewater is collected by the inlet pipe 50 opening into the pump chamber 19 after filtering in the screen basket 51 where the undesirable solid waste accumulates. When the liquid level reaches the upper sensor 69a, the irregulated pumps 61 are started and discharge the excess liquid in the outlet pipe 70, raised relative to the inlet pipe 50, and preceded by the pipes 60 each provided with a non-return valve 65. As long as the liquid level is higher than that of the lower sensor 69b, the pumps 61 operate. When the liquid level reaches the level of the lower sensor 69b, they stop.

 Note that the two sensors 69a and 69b should if possible be located at intermediate levels between that at the bottom of the end of the pipe 50 and that of the eomaet of the suction of the pumps 61. The walls 13 and 14 make it possible to minimize the depositing sediment at the bottom of the pump chamber 19 and increasing the mixing of the residual volume during the pumping phase.

 The liquid present in the pump chamber 19 can release toxic gases: methane, hydrogen sulfide, the latter being all the more dangerous as at high concentration, it paralyzes the olfactory nerves, which no longer makes it possible to detect it by its odor of rotten eggs which it normally gives off at low concentration. The valve chamber 20 is made perfectly sealed against these gases and therefore allows safe access for a human operator.

Claims (6)

 1) Prefabricated discharge station for wastewater, rainwater or industrial water, consisting of a tank (10) designed to receive one or more inlet pipes (50) and an outlet pipe (70) at a higher level A that of the inlet pipes (50), said tank (10) being provided in its upper part with at least one access hatch (31), said tank (10) being designed to accommodate, on the one hand, A a level lower than that of the inlet pipes (50), at least one widened pump (61), and, on the other hand, at least one non-return device (65), characterized in that said tank (10) has inside a closed chamber (20) provided for housing said one or more non-return equipment (65) and opening to the outside by an access hatch (32).  2) delivery station according to claim 1, characterized in that said chamber (20) occupies only part of the upper part of the tank (10).  3) delivery station according to claim 1 or 2, characterized in that said chamber (20), once said or said non-return equipment (65) mounted, is sealed and isolated from the arrival of liquid or gaseous effluents which can come from the rest of the tank (10).  4) delivery station according to claims 1, 2 or 3, characterized in that, under the access hatch (32), said valve chamber (20) is closed by a sealed cover (24).  5) Delivery station according to one of the preceding claims, characterized in that said valve chamber (20) is provided with a slab (22) in the form of a slope and equipped with a device (23) for the evacuation of water. of condensation.  6) delivery station according to one of the preceding claims, characterized in that said tank (10) is provided with an opening (31) at the top for viewing, mounting and lowering the pumps (61), the screen basket (51) and the level switches (69) directly from the ground, without the need to descend into the tank.