EP2686487A1 - Puisard pour un système de drainage comprenant une sortie restreinte - Google Patents

Puisard pour un système de drainage comprenant une sortie restreinte

Info

Publication number
EP2686487A1
EP2686487A1 EP12711748.9A EP12711748A EP2686487A1 EP 2686487 A1 EP2686487 A1 EP 2686487A1 EP 12711748 A EP12711748 A EP 12711748A EP 2686487 A1 EP2686487 A1 EP 2686487A1
Authority
EP
European Patent Office
Prior art keywords
gully
outlet
flow restrictor
wall
apertures
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12711748.9A
Other languages
German (de)
English (en)
Inventor
Jørgen Mosbæk JOHANNESSEN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mosbaek AS
Original Assignee
Mosbaek AS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mosbaek AS filed Critical Mosbaek AS
Publication of EP2686487A1 publication Critical patent/EP2686487A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • E03F5/105—Accessories, e.g. flow regulators or cleaning devices
    • E03F5/106—Passive flow control devices, i.e. not moving during flow regulation
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B11/00—Drainage of soil, e.g. for agricultural purposes

Definitions

  • a gully for a drainage system with a restricted outlet A gully for a drainage system with a restricted outlet.
  • the present invention relates to a gully for a drainage system, said gully com prising a gully wall enclosing a gully chamber, wherein connection with an external discharge pipe is provided for at an outlet of the gully, and wherein a flow restrictor with a smaller flow capacity than allowed by the outlet is provided at the outlet, whereby an exit path for a liquid in the gully chamber to the external discharge pipe extends through the flow restrictor.
  • Gullies of the above art are used for collecting discharge water and allowing the water thus collected to enter a downstream discharge pipe system, such as a sewer system, at a restricted or controlled rate.
  • a downstream discharge pipe system such as a sewer system
  • the flow restrictor has a smaller flow ca- pacity than allowed by the outlet, it still has a flow capacity, i.e. its flow capacity is larger than zero.
  • the flow restrictor has an inlet and an outlet positioned substantially at the same level, as compared to the vertical extension of the gully, to allow liquid to pass through the flow restrictor when the level of liquid upstream of the flow restrictor has reached the level of the outlet, and the flow capacity of the flow restrictor is proportional, though not linearly proportional, to the pressure head at the level of the outlet of the flow restrictor.
  • WO-A-2010/145662 e.g. discloses a drainage system and a vortex brake, wherein the drainage system combines a fascine or soak pit with a gully having an outlet, at which a vortex brake or flow brake is mounted. It is foreseen that the gully is too narrow (internal diameter 30 to 65 cm) for an operator to descent for maintenance of the flow brake and it is foreseen that the flow through the brake is limited to 0.2 to 1 l/s.
  • the drainage system is intended for installation on private land and accordingly the brake is securely installed to prevent removal thereof by the owner of the land. To resolve problems arising from clogging provisions are made for cleaning the brake from the terrain above the gully.
  • WO-A-2005/017270 discloses a well or gully for decentralized collection, temporary storage and drainage of rain water.
  • the gully fea- tures a diameter of 1.2 to 1.3 m and has a vortex brake at an outlet near the bottom.
  • a rotatable grating is provided in the gully in front of the vortex brake for preventing large foreign matter from entering the brake.
  • WO-A-2008/064683 d iscloses a detachably mounted vortex brake for a drainage system. Being detachably mounted the vortex brake may be detached and lifted to the surface above the gully for cleaning and maintenance. Further the vortex brake is equipped with two mountings on opposite sides and mounting the vortex brake using one mounting provides for a restricted flow through the vortex brake, whereas mounting of the vortex brake using the other mounting provides for using the vortex brake as a block preventing flow totally.
  • NO-A-82 0245 and the corresponding SE-B-447285 discloses a percolating surface water gully comprising a gully body recessed in a magazine of drainable material such as macadam. The entire magazine is surrounded by a water permeable screen. The wall of the gully body is perforated. The gully both comprises a weir and an outlet is provided downstream of said weir. When surface water is drained into the gully body is remains in the gully body until it has seeped out into the maga- zine and the surrounding ground. Only if the magazine has been saturated the water level will rise and once the level of the weir is reached water will flow over the weir and into the outlet without further restriction.
  • flow brake and "vortex brake” is synonym with terms as “flow restrictor” and “vortex restrictor” or “flow regulator” and “vortex regulator”, respectively.
  • flow brakes providing for restricting a flow from a gully to even lesser amounts than the amounts mentioned above i.e. down below 0.1 l/s will be needed for assisting a percolation system, on one hand in case of a rain event with a large quantity of precipitation and on the other hand in case of a raised groundwater level when groundwater may be led to e.g. a municipal sewer.
  • the gully wall comprises a plurality of apertures for allowing liquid to seep into the gully from the surroundings when the gully is installed in a ground.
  • the gully wall comprises a plurality of apertures for allowing liquid to seep into the gully from the surroundings when the gully is installed in a ground.
  • the apertures have a transverse measurement of less than 5 mm, preferably less than 1 mm and further preferably less than 1/4 mm to prevent gravel, sand and/or soil from entering the gully chamber through the apertures.
  • At least parts of the gully wall comprising a part of said plurality of apertures comprise a rigid wall part covered by a filter sheet comprising said apertures.
  • the gully wall comprises a rigid wall part providing strength and a filter sheet providing the apertures preventing gravel, sand and/or soil from entering the gully chamber.
  • an opening at the top of the gully is closed by a cover void of openings larger than the apertures. Since the flow restrictor is screened from blocking by the gully wall maintenance will be seldom needed and accordingly it will be possible to install the gully completely in the ground below the surface thereof to be covered with gravel, soil, etc.
  • any inlet to the gully passes through part of said plurality of apertures.
  • any liquid entering the gully cham- ber through other passages than throug h the plura lity of apertures should pass an external filter.
  • the flow restrictor is or comprises a vortex brake.
  • the vortex brake comprises a vortex chamber with a peripheral inlet and a central outlet, wherein the central outlet is connected to the outlet of the gully.
  • the flow restrictor is or comprises an orifice member and in a third embodiment the flow restrictor is or comprises a Borda tube.
  • an orifice member is a piece of plane wall with a through hole with a predetermined restricted diameter
  • a Borda tube is a short cylindrical tube extending from a hole in a wall of a chamber into said chamber from which a liquid is discharged through the Borda tube.
  • a flow of liquid discharging from a chamber through an orifice member is subject to contraction resulting in a smaller effective cross-sectional area of the flow compared to the diameter of the hole of the orifice mem ber, and a flow of liquid discharging from a cham ber through a Borda tube is subject to an even larger contraction compared to the internal diameter of the Borda tube.
  • the use of an orifice member or a Borda tube requires use of smaller cross-sectional areas of the flow passage through the flow restrictor than the case is when a vor- tex brake is used, which enhances the general risk of blocking.
  • the outlet comprises an outlet tube extending through the gully wall, said outlet tube having an upstream end attached to the flow restrictor and a downstream end for connection with the external discharge pipe, a weir being attached to the outlet tube down- stream of the flow restrictor, which has a flow restrictor outlet positioned below a head of said weir, when the gully is in an installed position.
  • the weir entails that the outlet opening of the flow restrictor remains submerges and generally that surfaces of the flow restrictor swept by liquid flowing out the gully chamber remains submerged. This solves or re- Jerusalem valves that might build up around any aerated outlet opening and over time cause blocking of the outlet opening.
  • Fig. 1 shows a vertical section of a gully according to the invention
  • Fig. 2 shows a top view of the gully of Fig. 1,
  • Fig. 3 shows a vertical section of a gully according to a second embodiment of the invention
  • Fig. 4 shows a top view of the gully of Fig. 3,
  • Fig. 5 shows a detail of Fig. 3 seen in the direction of arrow V
  • Fig. 6 shows a vertical section of a gully according to a third embodiment of the invention
  • Fig. 7 shows a top view of the gully of Fig. 6,
  • Fig. 8 shows a detail of Fig. 6 seen in the direction of arrow VIII
  • Fig. 9 shows a vertical section of a variant of the gully shown in Fig. 1.
  • the figures show a gully 1 installed in the ground adjacent a fascine or soak pit 3, which in a manner known per se may comprise fil- ter blocks enveloped in a water permeable membrane or filter cloth such as geotextile, which is known as a group of sheet materials of woven or non-woven plastic material such as polypropylene with pore sizes of approximately 0.1 mm or less.
  • the gully 1 and the soak pit 3 is embedded or installed in a body 2 of sand, gravel, pebble gravel or the like allowing water to seep through as it is generally known from installation of drain pipes.
  • the gully comprises a gully chamber 4 surrounded by a gully wall 5 comprising corrugated tubing 6 with crests 7 and troughs 9.
  • a perforated wall portion 11 of the gully 1 the troughs 9 comprise slit per- forations 13 and the perforated wall portion 11 is enveloped by a filter sheet 15 such as geotextile. Collar bands 17 are used for fixing the filter sheet 15 to the corrugated tubing 6.
  • the gully wall 5 comprises the material of the corrugated tubing 6, which constitutes a rigid wall part, and filter sheet 15.
  • the pores of the filter sheet constitutes together with the slit perforations 13 a plurality of apertures extending through the gully wall 5 and allowing water to seep through the gully wall.
  • the pores of the filter sheet define the transverse measurement of the apertures by defining the size of particles that are allowed to pass through the gully wall.
  • the corrugated tubing 6 is extending vertically and at the top of the gully 1 an open end of the corrugated tubing 6 is closed by a solid or unperforated cover 19 (shown only in Fig. 1). At the bottom the gully is closed by a bottom plate 20.
  • the gully 1 has an outlet 21 comprising an outlet tube 23 extending through a sealing sleeve 25 in an opening in the gully wall 5.
  • the sealing sleeve 25 is preferably made from rubber or elastomeric material.
  • the outlet tube 23 On the outside of the gully 1 the outlet tube 23 has a downstream end providing a connecting piece for connection with an external dis- charge pipe of a drainage system (not shown).
  • the outlet tube 23 has an internal diameter and a flow capacity corresponding to that of the external discharge pipe with which it is intended to be connected.
  • the outlet tube 23 is provided with a flow restrictor in form of a vortex brake 27 comprising a peripheral inlet 29, a vortex chamber 31 and a central outlet 33, providing in a manner known per se a flow passage through the vortex brake 27. Apart from the flow passage through the vortex brake 27 the outlet tube 23 is closed by the vortex brake and its mounting.
  • a weir 35 with a weir head 37 is provided in the outlet tube 23 .
  • the gully 1 may also be used for draining a soak pit to a drainage system, but in accordance with its inventive construction the gully 1 is not connected to the soak pit 3 through a pipe connection as taught in WO-A-2010/145662, but water seep from the soak pit 3 through the body of gravel 2 to the gully 1 and through the apertures of the perforated wall portion 11 into the gully chamber 4.
  • the gully 1 Since the only passageway into the gully, when the cover 19 is fitted, is through the apertures of the perforated wall portion 11, the gully is not open to inlet of solids of a size that could block the vortex brake, and therefore maintenance will seldom be needed and the cover 19 need not be readily accessible.
  • the gully 1 may be installed completely in the ground to be covered with soil (not shown).
  • the corrugated tubing 6 may have a diameter of e.g. 30 to 60 cm.
  • the vortex brake 27 may be dimensioned to allow a flow as little as 0.1 l/s having diameters of approximately 10 mm at the inlet 29 and the outlet 33.
  • Figs. 3 to 8 show two other embodiments, which differ from the embodiment of Figs. 1 and 2 only by the flow restrictor used.
  • the upstream end of the outlet tube 23 is closed by an orifice member 39 with a hole or an orifice 41 offset from the centre 43 of the orifice member 39 and the outlet tube 23.
  • the orifice 41 is placed below the weir head 37 to remain submerged.
  • the orifice has a diameter d.
  • an orifice member 39' is like- wise used, but in this case a Borda tube 45 with a diameter d extends from the orifice 41' into the gully chamber 4.
  • the Borda tube is a more efficient flow restrictor than the orifice alone, but still the cross-sectional area of the flow passage through the Borda tube 45 or the orifice 41 should be about 20 to 25% of the cross- sectional area of the inlet 29 and outlet 33 of the vortex brake 27 used in the first embodiment to provide the same flow restriction effect.
  • the second and third embodiments are foreseen primarily to be usable to allow flows of 0.5 l/s or more.
  • Fig. 9 shows an embodiment using the same flow brake as the embodiment of Fig. 1.
  • the embodiment of Fig. 9 differs from the embodiment of Fig. 1 in that the gully 1' comprises a branch 47, which is constituted by another piece of horizontally extending corrugated tubing with crests and troughs.
  • the branch 47 is connected to the lower part of the corrugated tubing 6 to open into it at the level of the outlet tube 23.
  • a branch part 47a is perforated comprising slit perforations 13a in the troughs whereas another part 47b of the branch is unperforated.
  • the perforated branch part 47a is enveloped by a filter sheet 15a such as geotextile, which is fixed to the branch 47 by collar bands 17a.
  • the branch 47 has a closed end 49 remote from the main part of the gully 1' i.e. the corrugated tubing 6.
  • the gully chamber 4' extends from the top of the corrugated tubing 6 through the branch 47 to the closed end 49 of the latter.
  • the perforated branch part 47a constitutes a supplement to the slit perforations 13 of the corru- gated tubing 6 for allowing water to seep into the gully 1'.
  • the perforated branch part 47a might constitute a substitute for the slit perforations 13 of the corrugated tubing 6, thus allowing water to seep into the gully only through the perforated branch part.
  • Fig. 9 shows the gully 1' installed adjacent the soak pit 3 and like this soak pit 3 and the vertically extending corrugated tubing 6 the branch 47, especially the perforated branch part 47a thereof, is embedded in the body 2 of sand, gravel, pebble gravel or the like.
  • the branch 47 is positioned next to the soak pit 3 alongside thereof and facilitates the seeping of water from the soak pit 3 into the gully 1'.
  • the gully 1' of the present invention may serve to clean the membrane or filter cloth enveloping the soak pit 3.
  • the gully 1, 1' may be filled with water e.g. by removing the cover 19 and pouring water into the vertically extending tubing 6.
  • the water will only slowly flow through the flow restric- tor 27, and the gully 1, 1' may be filled to the upper level of the soak pit 3.
  • the water will seep out through the perforated wall portions 11, and for the embodiment shown in Fig.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Agronomy & Crop Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Sewage (AREA)

Abstract

L'invention porte sur un puisard pour un système de drainage, lequel puisard comprend une paroi de puisard (5) renfermant une chambre de puisard (4), une liaison (23) avec un tuyau de décharge externe étant prévue pour une sortie (21) du puisard (1), et un élément de restriction d'écoulement (27) présentant une capacité d'écoulement inférieure à celle autorisée par la sortie étant disposé à la sortie, ce par quoi une trajectoire de sortie pour un liquide dans la chambre de puisard (4) vers le tuyau de décharge externe s'étend à travers l'élément de restriction d'écoulement (27). La paroi de puisard (5) comprend une pluralité d'ouvertures (13) pour permettre à un liquide de suinter dans la chambre de puisard (4) à partir de l'environnement lorsque le puisard est installé dans un sol.
EP12711748.9A 2011-03-16 2012-03-16 Puisard pour un système de drainage comprenant une sortie restreinte Withdrawn EP2686487A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201170124 2011-03-16
PCT/DK2012/050081 WO2012122990A1 (fr) 2011-03-16 2012-03-16 Puisard pour un système de drainage comprenant une sortie restreinte

Publications (1)

Publication Number Publication Date
EP2686487A1 true EP2686487A1 (fr) 2014-01-22

Family

ID=45928597

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12711748.9A Withdrawn EP2686487A1 (fr) 2011-03-16 2012-03-16 Puisard pour un système de drainage comprenant une sortie restreinte

Country Status (2)

Country Link
EP (1) EP2686487A1 (fr)
WO (1) WO2012122990A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111997169A (zh) * 2020-09-30 2020-11-27 中冶京诚工程技术有限公司 一种雨水井及道路雨水收集系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447285C (sv) 1981-01-28 1992-07-13 Jan Sundqvist Perkolerande dagvattenbrunn som innefattar magasin av draenerande material omsluten av vattengenomslaepplig duk
CA1165207A (fr) * 1982-06-24 1984-04-10 Corporation Of The Town Of Vaughan Etrangleur de debit
GB2303038B (en) * 1995-07-07 2000-02-23 James Paterson Izatt A verticle apparatus to drain and sub irrigate natural grass sportsfields
DK175417B1 (da) 2003-08-18 2004-10-04 J M J Holding Aps Brönd til decentral opsamling, midlertidig opbevaring og afledning af vand samt endeelement til en sådan brönd
DK200601583A (da) 2006-12-01 2008-06-02 Mosbaek As Hvirvelbremse til et aflöbsanlæg
DK176654B1 (da) 2007-05-11 2009-02-02 Mosbaek As Hvirvelbremse
EP2443291B1 (fr) 2009-06-17 2013-11-06 Mosbaek A/S Dispositif de drainage avec frein vortex

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2012122990A1 *

Also Published As

Publication number Publication date
WO2012122990A1 (fr) 2012-09-20

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