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WO2017196189A1 - Système de filtre pour eaux pluviales, châssis pliant, fosse de drainage et procédés associés - Google Patents

Système de filtre pour eaux pluviales, châssis pliant, fosse de drainage et procédés associés Download PDF

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Publication number
WO2017196189A1
WO2017196189A1 PCT/NZ2017/050057 NZ2017050057W WO2017196189A1 WO 2017196189 A1 WO2017196189 A1 WO 2017196189A1 NZ 2017050057 W NZ2017050057 W NZ 2017050057W WO 2017196189 A1 WO2017196189 A1 WO 2017196189A1
Authority
WO
WIPO (PCT)
Prior art keywords
pit
frame
storm water
water drain
base
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.)
Ceased
Application number
PCT/NZ2017/050057
Other languages
English (en)
Inventor
Gregory Paul Yeoman
Michael Morton Hannah
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.)
EHL Ltd
Original Assignee
EHL Ltd
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 EHL Ltd filed Critical EHL Ltd
Publication of WO2017196189A1 publication Critical patent/WO2017196189A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/0401—Gullies for use in roads or pavements
    • E03F5/0404—Gullies for use in roads or pavements with a permanent or temporary filtering device; Filtering devices specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates

Definitions

  • This invention relates to filtration apparatus for removing and recovering particulates and contaminants from storm water run-off. It also relates to methods of forming and installing storm water drain filters.
  • Storm water also known as stormwater
  • contaminants i.e. gross particulate matter, sediment, oil, grease, hydrocarbons, heavy metals etc, enters storm water drains via 'pits' also know as catch basins and stormwater inlets. It is desirable to retain these contaminants at the point of entry to the stormwater piping system and to periodically remove them to avoid blockage and contamination of the stormwater drainage system.
  • Pit inserts including a supporting frame and filter bag are used to remove contaminants and these need to be periodically removed for emptying and replacement.
  • the primary objectives of stormwater filter systems are:
  • Recent filter systems that utilise a filtration mesh/fabric body can be broadly categorized into two types:
  • Filters that are flexible and self-supporting tend to be of much smaller volume than the pits into which they are fitted, due to the fact that unsupported flexible materials cannot provide dimensional stability. This has a detrimental effect on the volume of material that can be retained in the filter and maintenance requirements.
  • Filters that are supported by external rigid cages are provided with dimensional stability as the filter body cannot bulge or expand beyond the limits of the cage. They allow for a larger bag volume which allows smaller particles to be captured.
  • these cages can add significantly to the mass of the filter apparatus and cannot be collapsed for transport or bespoke fitting to particular catchpits.
  • a bag is supported by a rigid frame it is bulky to transport and handle, uses much material to achieve rigidity, and can be difficult to install since many pits have differences in geometry or manufacturing flaws sometimes requiring a custom fit.
  • the designs may also suffer from bulging of the filter bag which can block a pit outlet and place localised stress on the filter bag. In addition, the bulging of the bag can cause it to be trapped in the frame or pit walls, to the extent it is not removable without considerable effort or damage to the bag or frame.
  • the designs may also suffer from small filter area and containment volume requiring a high frequency of maintenance.
  • the designs may also be complex, expensive to manufacture and pose a potential fire risk. When the filter is immersed in water, there is a possibility that the trapped material will contaminate the exiting water.
  • the filter bag may become bio- fouled and it has also been found that this is a preferred habitat for mosquitos in tropical countries. It would be desirable for the filter bag to be above the water level in the pit during periods of low flow. It would also be desirable for the filter bag to be below the water level during periods of high flow to dissipate energy.
  • a storm water drain pit including a flow control system which, during periods of low flow, maintains the level of liquid in the pit below a first level and, during periods of high flow, maintains the level of liquid above a second level at least 0.3m higher than the first level.
  • a collapsible frame for supporting a storm water drain bag including a plurality of perforated rigid side panels and a base panel connected together by hinge joints along edges of the panels such that the panels may be folded into a substantially flat pack configuration and unfolded to form a frame that may surround and support a storm water drain bag.
  • a frame for supporting a storm water drain bag including a perforated sheet formed into a cylinder having bands at the top and bottom retaining the sheet in cylindrical form and a base provided at one end of the cylinder.
  • a band for forming a frame for a pit insert comprising a flat strip having support brackets provided at intervals wherein the brackets project away from a flat face of the strip so as to provide effective support for the rim of a filter bag when installed in a frame.
  • a kit for forming a frame for a pit insert may be provided including such a band and a sheet of mesh and a bottom band.
  • a method of forming a frame from a sheet of perforated material comprising rolling the perforated sheet into a cylinder of desired diameter, fitting bands to the top and bottom of the cylinder, fixing them to the cylinder and fitting a base.
  • a storm water drain assembly including a storm water drain pit as hereinbefore described and a pit insert positioned within the pit such that during periods of low flow the bottom of the pit insert is maintained above the low flow fluid level in the pit and during periods of high flow the bottom of the pit insert is at or below the high flow fluid level in the pit.
  • the pit insert may be of the form hereinbefore described.
  • a storm water drain frame having a base and side walls and a flotation layer positioned in the base of the frame to support a filter bag at or above liquid when in use.
  • a pit having an inlet and an outlet
  • a flow distributor which distributes fluid from the inlet into all or selected ones of the plurality of pit inserts
  • Figure 1 shows an exploded perspective view of a storm water drain filter system
  • Figure 2 shows a collapsible frame according to a first embod
  • Figure 3 shows a collapsible frame according to a second embod
  • Figure 4 shows the collapsible cage of Figure 3 in a different configuration
  • Figure 5 shows a collapsible frame of the same type as shown in Figures 3 and 4 but of different dimensions;
  • Figure 6 shows the collapsible cage of Figure 3 in a different configuration
  • Figure 7 shows a collapsible frame of the same type as shown in Figures 3
  • Figure 8 shows a bracket for mounting a frame to a pit
  • Figure 9 shows an exploded view of an arrangement for mounting a frame to a pit
  • Figure 10 shows a collapsible frame of generally cylindrical form
  • Figure 11 shows a band provided around the opening of the collapsible frame shown in Figure 10;
  • Figures 12 and 13 show a method of forming a collapsible frame
  • Figure 14 shows a bottom perspective view of a frame having a base formed of cables
  • Figure 15 shows a side cross-sectional view of a frame and filter bag installed in a pit employing a syphon flow control system
  • Figure 16 shows a side cross-sectional view of a frame and filter bag installed in a pit employing a flow control system employing restricted and unrestricted outlets;
  • Figure 17 shows a flow control system in the form of a syphon box
  • Figure 18 shows a plan view of storm water filter system including a plurality of pit inserts
  • Figure 19 shows a side cross sectional view of the storm water filter system shown in Figure 18;
  • Figure 20 shows a perspective view of the storm water filter system shown in Figure 18; and Figure 21 shows a plan view of a dissipation layer.
  • Figure 1 shows an exploded view of a pit insert consisting of a filter bag 1 that locates within a collapsible frame 2.
  • Figure 2 shows a collapsible frame according to a first embodiment consisting of perforated rigid side panels 3 to 6 (shown in wire outline only to assist comprehension) interconnected along their side edges by hinged connections 7 (only one of which is indicated).
  • a base 8 also formed of a perforated rigid panel is hingedly connected along one edge to the lower edge of panel 6.
  • the panel may be manipulated from a flat pack state in which panels 4 and 6 are brought together and an open configuration in which the frame has a generally open box form.
  • base 8 When the sides are brought into the open box form base 8 may be rotated from a position in which it is against panel 6 to a position in which the free edge of base 8 rests on ledge 9.
  • Figure 1 shows all panels of the frame formed of wire mesh with the base in he almost completely lowered position.
  • This construction allows the frame to be transported in a compact flat form and then easily inserted into a pit and opened for use. It may then be installed in a pit and a filter bag inserted.
  • FIG. 3 shows a modified form of the frame shown in figure 2 in with two of the sides have a bifolding construction.
  • the frame consists of side walls 11 to 16 having hinged joints 17 (only one of which is indicated).
  • the end walls are formed of bifolding panel pairs 13 and 14; and 15 and 16.
  • base 18 is rotated up against panel 12 and bifolding panel pairs 13 and 14; and 15 and 16 are forced inwardly at their hinges as shown part way through folding (it is to be noted that base 18 would be against panel 12 when the bifolding panels are moved inwards).
  • To open the frame the hinges between the bifolding panels are moved outwards to the position sown in Figure 4 and the basel8 is rotated down so that its distal edge rests upon ledge 19.
  • This construction has the advantage that it has a more compact form that will reduce size for transport and assist inserting the frame into a pit.
  • the side panels and base may all be formed of a perforated material such as a mesh.
  • a perforated material such as a mesh.
  • This is preferably a plastics coated metal mesh such as a fuse bonded PVC coated galvanised metal mesh sold under the trade mark AQUAMESHTM. This material is relatively inert and durable so that when submerged or partially submerged it has reduced leaching of harmful pollutants such as zinc compared to typical galvanized wire.
  • the hinge joints 7 and 17 may be crimped metal clips as shown in Figures 6 and 7.
  • Figure 6 shows a 'J' clip about wires 20 and 21 (sections of panels of the frames) and Figure 7 shows the 'J' clip 22 when closed around wires 20 and 21.
  • Other suitable fasteners such as ratchet clips may also be employed.
  • Figure 8 shows a bracket 30 for mounting a frame to a pit.
  • the bracket 30 may be secured to the mesh 31 of a side of a frame by suitable fasteners or welding etc.
  • a first extension 33 is provided to support the rim of a filter bag provided within a frame.
  • a series of extensions 33 around the opening of the frame support a wire rim around the opening of the filter bag.
  • a second extension 32 is used to secure the bracket to the pit or a structure at the pit opening.
  • Fasteners 34 may be used to secure the bracket directly to the pit.
  • extension 32 may rest on the edges of an opening in the pit - either the pit side walls or a plate etc. provided at the pit opening.
  • Figure 9 shows such an arrangement where a pit 40 has a metal sheet 41 with an opening dimensioned to receive a frame 43.
  • a series of brackets around the mouth of frame 43 have extensions 42 that allow the frame to hang from plate 41.
  • a grill 44 may be placed over the assembly.
  • a generally cylindrical collapsible frame 50 is formed from a sheet of perforated material 51, such as the mesh described in relation to the previous embodiment.
  • a filter bag 52 is located within the frame 50 as indicated by 52 in the cutaway section.
  • a bottom band 58 is in the form of a flat strip of metal with apertures 59 provided at intervals at either end. The band is initially a flat strip and the ends are brought together to form a band and a fastener 60 secures the band at a required size.
  • a top band 53 is provided around the top of the mesh cylinder 51 and secured thereto be suitable fasteners. As shown in Figure 11 the top band 53 is in the form of a flat strip of metal having apertures 56 at intervals at either end or along its entire length.
  • Brackets 54 are provided at intervals and have inward ledges 55 for supporting the rim of a filter bag.
  • a frame is formed by rolling a sheet of mesh
  • a top band 53 is formed from a continuous strip (either using the whole strip or cutting a length) of material and the ends are fastened together by a fastener 57 through aligned apertures 56.
  • a continuous strip is used to form the bottom band (either using a whole strip or cutting a section from a longer strip) and at a required radius a fastener 60 passes through aligned apertures 59 to form a band of the required radius.
  • the top and bottom bands are then secured to the mesh cylinder using suitable fasteners.
  • the base of the frame may be either a preformed circular base of requisite size or else cable sections 62 may be threaded between lower openings in the mesh to form a base as shown in Figure 14.
  • This construction allows frames of the required diameter to be formed on site as well as providing a very compact form for transport.
  • the bands nay be adjustable over a wide range of frame diameters and may be cut from a roll to accommodate a wide range of sizes.
  • the pit includes a flow control system which, during periods of low flow, maintains the level of liquid in the pit below a first "low" level 75 below the bottom of filter bag 73 and, during periods of high flow, maintains the level of liquid above a second "high" level 74, at or above the bottom of filter bag 73.
  • the second level is preferably at least 0.3m, and more preferably 0.5 m, higher than the first level.
  • a syphon 72 provides the flow control as when the water level is at the high level 74 it will continue to flow out of the syphon 72 until the level drops to the level of the syphon inlet 76.
  • FIG. 15 shows a box syphon formed integrally as part of a pit with wall 81 being the outer wall of the pit, with the syphon being formed by outer walls 82 and 83 and inner wall 84.
  • Figure 16 shows a flow control system using restricted and unrestricted outlets.
  • Pit 90 has an unrestricted upper outlet to ensure that water at a high level 92 is removed from the pit and a lower restricted outlet 93 which only allows a reduced flow until water reaches a lower level 95.
  • the reduced flow may be achieved by placing a restrictor 94 of reduced area in outlet 93. Whilst the level of restriction will depend upon the application outlet 93 may typically only allow 10% or less of the flow rate allowed through outlet 91. Again whilst the level of restriction will depend upon the application outlet 93 may typically only allow a flow rate of 1 litre per second or less.
  • a flotation layer 96 may be provided under filter bag 97 within frame 98.
  • the flotation layer 96 may be a block of closed cell foam or a moulded hollow structure etc. This may assist in keeping the filter bag above the water level and assist in dissipating energy from the water flow.
  • layer 97 may be an energy dissipation layer to dissipate energy.
  • the dissipation layer may be in the form of a lattice defining a plurality of through holes.
  • This layer may be formed of a buoyant plastics material or may be formed with a hollow core so that it may remain buoyant. This layer helps to further dissipate energy of the flow so as to reduce the amount of suspended material in the flow exiting the pit.
  • a storm water filter system 100 is shown in which pit 101 has an inlet 102 which supplies the inlet flow to a flow distributor in the form of channel 103.
  • Channel 103 in this embodiment has V shaped outlets (one of which is indicated at 105) to supply flow to a plurality of pit inserts 104.
  • a V shaper outlet is effective to equalize flow between filter inserts.
  • the profile of the outlets may be modified to achieve a desired distribution.
  • each outlet 105 may be a flume or a flume with internal baffles or another hydraulic primary structure to evenly load the individual pit inserts.
  • One or more outlet 105 may be closed by placing a sheet of material across it to allow a pit insert to be removed for replacement or maintenance when grate 107 is removed. This allows the system to operate continuously during maintenance. Fluid passing through filter inserts 104 flows into the base of the pit 101 and exits via a box syphon 106 as described in relation to previous embodiments.
  • each pit insert 104 may be of a size that is easily handled for maintenance and replacement.
  • the system is also easily scaled and provides the other advantages of the previous embodiments.
  • distributor is a channel with openings adjacent the tops of the pit inserts.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Filtration Of Liquid (AREA)

Abstract

Une fosse de drainage pour eaux pluviales comprend un système de régulation de débit qui, en périodes de faible débit, maintient le niveau de liquide dans la fosse au-dessous d'un premier niveau et, en périodes de débit élevé, maintient le niveau de liquide au-dessus d'un second niveau. Un premier châssis pliant comporte des panneaux perforés reliés les uns aux autres par des articulations, de sorte que les panneaux peuvent être repliés de façon à adopter une configuration plate et dépliés pour former un châssis destiné à entourer et supporter un sac de drainage d'eaux pluviales. Un chassis tubulaire peut être formé en enroulant d'une feuille perforée sous la forme d'un cylindre de diamètre désiré, en ajustant des bandes sur le haut et le bas du cylindre, en les fixant au cylindre et en installant une base. Les bandes peuvent être des bandes plates munies de supports placés à intervalles et dépassant d'une face plate de la bande pour servir d'appui au rebord d'un sac filtrant. Un système de filtre d'eaux pluviales comprend une fosse ayant une entrée et une sortie; une pluralité d'inserts pour fosse sous la forme de châssis perforés supportant des sacs filtrants; un répartiteur de débit qui répartit le fluide depuis l'entrée vers tous les inserts ou vers certains inserts choisis parmi la pluralité d'inserts de fosse; et un orifice de sortie destiné à recevoir le liquide passant à travers les inserts de fosse et sortant de la fosse.
PCT/NZ2017/050057 2016-05-12 2017-05-10 Système de filtre pour eaux pluviales, châssis pliant, fosse de drainage et procédés associés Ceased WO2017196189A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NZ720093 2016-05-12
NZ72009316 2016-05-12

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WO2017196189A1 true WO2017196189A1 (fr) 2017-11-16

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019103627A1 (fr) * 2017-11-27 2019-05-31 Ehl Limited Système d'évacuation des eaux d'orage et ses éléments et procédés d'utilisation
NL1042693B1 (en) * 2017-12-22 2019-07-01 Wavin Bv Gully or gully part
FR3136249A1 (fr) * 2022-06-03 2023-12-08 Eurofilet France Dispositif universel anti-déchets pour avaloir de rue

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640339A1 (de) * 1986-11-26 1988-06-09 Rolf Stahn Verfahren und vorrichtung zur schaffung von stauraeumen fuer ein entwaesserungssystem
DE3808297A1 (de) * 1988-03-12 1989-09-21 Wolfgang Schilling Regenwasserbehandlung und kanalspuelung durch neuartige strasseneinlaeufe (hebergully)
WO1990015311A1 (fr) * 1989-06-09 1990-12-13 Alf Andersson Appareil de dosage de liquides
WO1991014054A1 (fr) * 1990-03-15 1991-09-19 Uponor N.V. Amelioration apportee a un systeme d'egouts
NZ336761A (en) * 1999-07-12 2001-01-26 Enviropod Holdings Ltd Filter for storm water from construction sites, earthwork sites and from general paved areas
US20140374332A1 (en) * 2010-09-17 2014-12-25 Michael Morton Hannah Storm water filter and components thereof and methods of installation and use

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3640339A1 (de) * 1986-11-26 1988-06-09 Rolf Stahn Verfahren und vorrichtung zur schaffung von stauraeumen fuer ein entwaesserungssystem
DE3808297A1 (de) * 1988-03-12 1989-09-21 Wolfgang Schilling Regenwasserbehandlung und kanalspuelung durch neuartige strasseneinlaeufe (hebergully)
WO1990015311A1 (fr) * 1989-06-09 1990-12-13 Alf Andersson Appareil de dosage de liquides
WO1991014054A1 (fr) * 1990-03-15 1991-09-19 Uponor N.V. Amelioration apportee a un systeme d'egouts
NZ336761A (en) * 1999-07-12 2001-01-26 Enviropod Holdings Ltd Filter for storm water from construction sites, earthwork sites and from general paved areas
US20140374332A1 (en) * 2010-09-17 2014-12-25 Michael Morton Hannah Storm water filter and components thereof and methods of installation and use

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019103627A1 (fr) * 2017-11-27 2019-05-31 Ehl Limited Système d'évacuation des eaux d'orage et ses éléments et procédés d'utilisation
US11186980B2 (en) 2017-11-27 2021-11-30 Stormwater360 Group Limited Storm water drain system and components thereof and methods of use
NL1042693B1 (en) * 2017-12-22 2019-07-01 Wavin Bv Gully or gully part
FR3136249A1 (fr) * 2022-06-03 2023-12-08 Eurofilet France Dispositif universel anti-déchets pour avaloir de rue

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