Key information

Title
SYSTEM FOR DRAINAGE OF SURFACE WATER
Application number
20181281
Case type
National
Status
26.04.2021 Patent meddelt (B1)
Filed
03.10.2018
Priority
22.05.2018 NO 20180711
Effective date
03.10.2018
Publicly available
25.11.2019
Next annual fee due
31.10.2027
Applicant
AIWELL HOLDING AS (NO)
Owner
AIWELL HOLDING AS (NO)
Inventor
Asle Johnsen (NO)
Agent
ACAPO ONSAGERS AS (NO)
Granted
26.04.2021
Patent number
345582
Expiry date
03.10.2038

Abstract and drawing

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content.
System for drainage of surface water, the system comprises a number of manholes being connected to a main pipe leading water to a recipient. Each manhole has a drain for leading water from the manhole to the main pipe, and the drain comprises a at least one outlet and a corresponding lid, the lid is limiting the outlet until the water is at a predetermined level in the manhole. The system further comprises a check valve is arranged downstream of the drain of each manhole, preventing water from entering the manhole from the main pipe, and at least one air bleeder valve and at least one upwards U-shaped pipe is arranged between a manhole and the recipient.

Publications

A1
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Documents

 Expand Download files (34)
Date
 Date Doc. No. Process Case number In/Out Journal description To/from
 29.04.2021 13-01 Saksbehandling 20181281(345582) UT PT Registreringsbrev Nasjonal Patent (15) (PT20181281)
15.03.2021 12-01 Saksbehandling 20181281 UT PT Meddelelse om patent ACAPO AS
 05.01.2021 11-03 Saksbehandling 20181281 INN P17269NO01 - Trykningsklar tekst renskrevet ACAPO AS
 05.01.2021 11-02 Saksbehandling 20181281 INN P17269NO01 - Trykningsklar tekst med endringer ACAPO AS
 05.01.2021 11-01 Saksbehandling 20181281 INN Korrespondanse (Hovedbrev inn) ACAPO AS
 15.12.2020 10-07 Saksbehandling 20181281 INN P17269NO01 - norske krav ACAPO AS
 15.12.2020 10-06 Saksbehandling 20181281 INN P17269NO01 - figs renskrevet ACAPO AS
 15.12.2020 10-05 Saksbehandling 20181281 INN P17269NO01 - figs endret ACAPO AS
 15.12.2020 10-04 Saksbehandling 20181281 INN P17269NO01 - claims Dec 2020 marked ACAPO AS
 15.12.2020 10-03 Saksbehandling 20181281 INN P17269NO01 - claims Dec 2020 cleaned ACAPO AS
 15.12.2020 10-02 Saksbehandling 20181281 INN P17269NO01 - besvarelse ACAPO AS
 15.12.2020 10-01 Saksbehandling 20181281 INN Korrespondanse (Hovedbrev inn) ACAPO AS
 24.10.2020 09-01 Saksbehandling 20181281 UT Realitet patent ACAPO AS
 01.09.2020 08-01 Saksbehandling 20181281 UT PT Varsel om betaling av første årsavgift (3317) (PT20181281)
05.05.2020 07-05 Saksbehandling 20181281 INN Krav merket ACAPO AS
 05.05.2020 07-04 Saksbehandling 20181281 INN Krav ren ACAPO AS
 05.05.2020 07-03 Saksbehandling 20181281 INN Hovedbrev ACAPO AS
 05.05.2020 07-02 Saksbehandling 20181281 INN P17269PC00 - Demand ACAPO AS
 05.05.2020 07-01 Saksbehandling 20181281 INN Korrespondanse (Hovedbrev inn) ACAPO AS
 06.02.2020 06-01 Saksbehandling 20181281 UT Realitet patent ACAPO AS
 11.04.2019 05-05 Saksbehandling 20181281 INN Hovedbrev ACAPO AS
 11.04.2019 05-04 Saksbehandling 20181281 INN vedlegg eksempel ACAPO AS
 11.04.2019 05-03 Saksbehandling 20181281 INN Krav merket ACAPO AS
 11.04.2019 05-02 Saksbehandling 20181281 INN Krav ren ACAPO AS
 11.04.2019 05-01 Saksbehandling 20181281 INN Korrespondanse (Hovedbrev inn) ACAPO AS
 18.02.2019 04-02 Saksbehandling 20181281 UT PT_report 08:33:06
18.02.2019 04-01 Saksbehandling 20181281 UT Realitet patent ACAPO AS
 14.12.2018 03-03 Saksbehandling 20181281 INN Fullmakt ACAPO AS
 14.12.2018 03-02 Saksbehandling 20181281 INN Overdragelsesdokument ACAPO AS
 14.12.2018 03-01 Saksbehandling 20181281 INN Korrespondanse (Hovedbrev inn) ACAPO AS
 04.10.2018 02-01 Saksbehandling 20181281 UT Formalia 1 ACAPO AS
 03.10.2018 01-03 Saksbehandling 20181281 INN Beskrivelse ACAPO AS
 03.10.2018 01-02 Saksbehandling 20181281 INN Patenttegninger ACAPO AS
 03.10.2018 01-01 Saksbehandling 20181281 INN Søknadsskjema Patent ACAPO AS

Description, claims and drawings

Disclaimer: This text has been machine-scanned and may contain errors – please refer to "Publications" for legally binding content. Description
System for drainage of surface waterThe present invention relates to a system for drainage of surface water, according to the preamble of patent claim 1.BackgroundSealed surfaces such as roads, pavements and the like require drainage. It is convenient to connect such drainage with drainage from buildings, as they contain similar type of water and may be handled together. Drainage from roads and buildings are normally requiring less processing than sewage water. Drainage of sealed surfaces, pavements and the like is generally accomplished by open channels, such as channel systems which are covered by gratings.When the drainage system reaches the limit of drainage during heavy rainfalls, the water is not drained away from the surface, and may cause accidents for instance due to aquaplaning on roads. Another problem is related to backflow of water, as the water may flow back through the pipes and out of another gutter, creating a flood. This is especially undesirable if drainage from buildings are connected to the same system, as large water damage may occur to the building.In a traditional drainage system for use in surface water, fluid from inlets are collected and guided in branch pipes and main pipes, typically via one or more manholes and collection tanks to a recipient, possibly including a water processing plant. The flow is based upon water flowing by its own weight, and is called "gravity flow" or "gravity drainage". Manholes, pipes and manifolds are open and allow air to be let into the drainage system and thereby the amount of liquid that the system can handle is limited. In WO 2014/209133 it is described a system whereby the "gravity flow" is replaced by a "full current flow" wherein no gas is flowing together with the water. "Full current flow" is also known as "siphonic drainage" or "siphonic flow" in prior art. In order to achieve sufficient drainage during heavy rainfalls, it is also known to use channels wherein the diameter increases in the downstream direction. The installation of these cascade systems is very laborious and costly, as drainage channels with different drainage cross sections have to be combined with one another. This results in higher construction costs and planning costs.The object of the invention is to provide a surface water drainage system having large drainage capacity, and reducing the risk of back flow and flood. Further there is an object that the system should be reliable and demand little or no maintenance. Yet another object is that it should be possible to install the system into existing pipes and manholes, and thus avoid both inconvenience and costs related to construction.The inventionThe objects are met by a system according to the characterizing part of the independent patent claim. Further advantageous features are stated in the dependent claims.A system for drainage of surface water according to the present invention, comprises a number of manholes being connected to a main pipe leading water to a recipient. Each manhole has a drain for leading water from the manhole to the main pipe. The drain comprises at least one outlet and a corresponding lid, wherein the lid is limiting the outlet until the water is at a predetermined level in the manhole. A check valve is arranged downstream of the the drain of each manhole, preventing water from entering the manhole form the main pipe, and the system comprises further at least one air bleeder valve and an upwards U-shaped pipe bend arranged between a manhole and the recipient.By "manhole" it is in this application meant a tank being a part of a drainage system in that it is connected to at least one inlet upstream and a main pipe or a branch pipe downstream. The manhole comprises a reservoir for water, and usually a reservoir for sand and other sedimentable pollutions. Some manholes also comprise a detachable cover, pumps and other equipment, and a manhole may be large enough for a person to enter and inspect the drainage system.By "limiting the outlet" it is in this application meant that the lid limits the amount of water that may flow into the outlet. This may be done by limiting the cross section of the outlet, or by limiting an opening to the outlet for instance by lifting the lid a very short distance above the outlet. Limiting should also include the situation wherein the lid closes the outlet.The recipient may be the ocean, but any reservoir or even a large pipe or a culvert which is enabled to receive the water, should be considered as recipient.By "an upwards U-shaped pipe" it is meant a pipe having a part turning upwards and a part turning downwards, in order to create a curvature having the curve at the upper point. Even if the expression U-shaped is used, the vertical parts may be slanting and not vertical. These kind of bends are well known to a skilled person.The U-shaped pipe and the air bleeder valve may be arranged at the main pipe, at a branch pipe, at the outlet of the manhole, or at any other convenient place along system. The air bleeder valve is preferably arranged at the top curvature of the U-shaped pipe, but it may also be arranged at any other places along the system. An air bleeder valve according to the invention, lets air out but not into the system.During heavily rainfall, more water will flow from the manhole nearest the recipient, and less water from the farthest manhole, which may create a flood in the farthest manhole, and overcapacity in the nearest manhole. In the present invention this may be solved by having several outlets of the drains of the manholes, and opening the suitable number of outlets in each manhole. In another embodiment of the present invention, the drain of the manhole being closest to the recipient has less cross section than the drain of the manhole next closest to the recipient, and the drain of the manhole being farthest off the recipient has the largest cross section In both cases, when the total outlet of the drain of the manhole being closest to the recipient has less cross section than the total outlet of the drain of the manhole next closest to the recipient, etc, the capacity of the system as a whole is improved.When the water is flowing into the manhole, sand and other pollutants are precipitating at the reservoir for sand, while the water is flowing out through the drain. When more water is flowing into the manhole than out of the drain, the water level of the water reservoir in the manhole will rise. The drain in the manhole is preferably a drain allowing both gravity drainage and siphonic drainage, depending on the level of water in the reservoir of the manhole, and once the level has reached a predetermined level, the drain will open for siphonic drainage. Such a drain is well known to a skilled person.When the drain opens for siphonic drainage, the amount of the water flowing out of the manhole will also increase. At one point it will fill up the main pipe 100%.Normally this occurs at the outlet to the recipient but it can also occur in flat areas of the pipes. When this happens there will be a pressure in the system and the water will try to get out the easiest way, usually out the manholes downstream. The check valves arranged downstream of the drains in the manholes will prevent that from happening. This increase in pressure will increase the flow speed. At one point, the water will drag all the air in the pipes out into the recipient. When this happens the flow shifts from gravity to siphonic drainage and the capacity in the pipes increases depending on the height difference from the start of the system to the end, at the recipient and also on the length of the pipe. During the shift from gravity drainage to siphonic drainage, the air may escape from the air bleeder valves arranged along the system.When the rain stops one of two alternatives will occur.1) If the outlet of the main pipe is under the water in the recipient and the lid at the drain closes the outlet air tight, then the whole pipe system will be 100% filled with water. This system will maintain siphonic pressure. 2) If the outlet of the main pipe is not under water, or the lids allow some air to flow into the outlet, then the water in the main pipe will drain out and the process will return to a gravity drainage system.When the water level in the manholes increases and the system switches over to siphonic drainage, the water level in the manhole will start sinking. If the rain intensity continues, the water level in the manhole will rise and more water will flow through the pipes until it reaches its maximum capacity.In one embodiment of the invention, each manhole is connected to a branch pipe, and each branch pipe is connected to a main pipe, leading the water to a recipient. A number of manholes are connected to the same branch pipe.In a preferred embodiment, an upward U-shaped pipe as mentioned above, is arranged between the branch pipe and the main pipe, or between the main pipe and the recipient. If the drain allows for siphonic drainage, then the upwards U-shaped pipe will ensure that the pipe from the U-shaped pipe to the drain is filled with water, regardless of the water level downstream of the U-shaped pipe The U-shaped pipe may also be arranged between a manhole and the branch or main pipe.Each drain has a lid limiting the amount of water entering the drain until the water is a predetermined level in the manhole. In one embodiment, the lid is allowing some water to enter the drain regardless of the water level of the man hole, and this allows gravity drainage. In a more preferred embodiment, the lid is a float, and once the water level is above a predetermined level, the float maybe removed from the outlet of the drain and siphonic drainage will be allowed.. These embodiments may preferably be combined in that the lid allows gravity flow until the water is at a predetermined level in the manhole, then it is removed and allows siphonic flow.In an alternative embodiment, the lid will only be lifted a given distance, allowing some water but still limiting the amount of water entering the drain. In yet another embodiment, the lid has a design that limits the flow of water into the outlet, even after the lid is lifted off the outlet. In a preferred embodiment, each drain has a number of outlets, and the number of outlets being opened depends on the level of water in the manhole. In this case more water in the manhole results in more outlets being opened, thereby increasing the total cross section of the outlets, and more water may be drained.When the whole or part of the system operates at siphonic drainage, there will be a suction in the outlet of the drain. This suction will depend on the height from the end of the siphonic drainage, as the suction is proportional to the height between the beginning of the siphonic drainage and the outlet. If the whole system is running with siphonic drainage, then the suction will depend on the height between the outlet and the final destination of the water. If only parts of the system is running with siphonic drainage, for instance a branch pipe, then the suction will depend on the height from the beginning of the branch pipe to the outlet. Parts of the system may be running with siphonic drainage due to the U-shaped pipe as described above, or because the outlet of the branch pipe into the main pipe is below water. The effect of suction during siphonic drainage is well known to a skilled person.A system according to the present invention may utilize well known pipes and manholes, and may thus be installed in already existing drainage systems after the systems are made air tight.ExamplesThe following description of an exemplary embodiment refers to the figures, and the following detailed description is not meant or intended to limit the invention. Instead, the scope of the invention is defined by the appended claims.Reference throughout the specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the subject matter disclosed. Thus, the appearance of the phrases “in one embodiment” or “in an embodiment” in various places throughout the specification is not necessarily refer ring to the same embodiment. Further, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.The different parts of the figures are not necessarily in scale to each other, as the figures are merely for illustrating the invention.The invention will in the following be described with reference to the enclosed figures, whereFigure 1 shows a cross section of a road with a drainage system according to the present invention,Figure 2 shows part of Figure 1 in detail,Figure 3 shows a section along line A-A of Figure 3,Figure 4 shows a part of Figure 2, in detail,Figure 5 shows a main pipe of a system according to the present invention, comprising a number of manholes,Figure 6 shows another embodiment of the drain according to the invention, Figure 7 shows yet another embodiment of the drain according to the invention, and Figure 8 shows the embodiment of Figure 7 from above.In the embodiment shown in Figure 1, a drainage system according to the present invention comprises different types of manholes. One type of manhole 1 for receiving water from a building, preferably from the rain gutter 4 of a building, one type of manhole 2 for receiving water from a road, and one type of manhole 3 receiving water from the other manholes 1, 2, and connected to a main pipe 5 leading water to a recipient 6.In Figure 2 the manhole 1 and 2 are shown in detail. The water is entering manhole 1 from the rain gutter 4, and flowing into a sand reservoir 101 at the bottom of the manhole 1. A drain 102 is arranged at a distance from the bottom of the manhole, and the space 103 inside the manhole is used as a water reservoir. Correspondingly, the water is entering the manhole 2 from the road, flowing into a sand reservoir 201 at the bottom of the manhole, and a drain 202 is arranged at a distance from the manhole. In the pipe 7 running between manhole 1 and manhole 2 there is arranged a check valve 8, preventing water from manhole 2 to enter manhole 1. In the shown embodiment, a part of the pipe 7 is arranged as a U-shaped pipe having a vertical curve or bend 9, which allows water from manhole 1 to flow as siphonic drainage, even if air is drawn into the drain at manhole 2. An air bleeder (not shown) is arranged at the top of the bend, in order to let air out if necessary.In manhole 2 the drain 202 is shown with a lid in the form of a ball 204 arranged on the top of an outlet 205, whereby the ball 204 is surrounded by guiding pins 206. This is also shown in Figure 3 showing a cross section of manhole 2. When the water level in manhole 2 is sufficient to lift the ball 204 off the outlet 205, water will flow into the outlet. Under normal conditions, the drain will only function with siphonic drainage, as the water will not lift the ball until the water level is above the opening of the outlet.In a not shown embodiment, the ball is bearing against some knobs on a top edge of the outlet, leaving a small opening into the outlet even when the ball is resting on the top. With this embodiment, the manhole 2 will also function with gravitation drainage.Figure 4 shows the drain of manhole 1 in Figure 2 in detail. The lid is an alternative to the lid shown in Figure 3, and covers an outlet 105 of the manhole 1. The lid shown in Figure 3 comprises a first float 106 having a through opening 107, being closed by a cap 108 arranged on a lever 109 operated by a second float 110. When the second float 110 is lifted by the water in the manhole, the cap 108 is lifted off the opening 107 of the first float 106. Air will then be drawn through the opening 107 and into the outlet 105, reducing negative pressure inside the outlet, and then the first float 106 will be lifted off the outlet 105 of the drain. By designing the lid in this way, using a second float 110 to let air into the outlet and thereby reducing the negative pressure, the lid shown in Figure 4 is lifted at a lower water level than if the first float should be lifted directly. Figure 5 shows a number of manholes 3 connected to the same main pipe leading the water to a recipient. When all drains and the main pipe operates at siphonic drainage, the amount of water flowing through the system and into the recipient is greatly increased compared to when the system operate at gravitational drainage.Figure 6 shows a cross section of an alternative embodiment of the drain, wherein the drain comprises an inner chamber 307 having one outlet 305 to the main pipe, 4 inlets 308 leading water from the manhole to the inner chamber 307, and a check valve 309 arranged in the outlet. Each inlet 308 have different cross section, are arranged at different levels in the manhole, and are covered by a separate lid 306 designed to have different buoyancy. The sum of the cross sections of the inlets 308 to the inner chamber 307 are larger than the cross section of the outlet 305 from the inner chamber to the main pipe. When sufficient inlets 308 are open, the flow rate through each inlet will be less than the flow rate through the outlet 305, and thus the inlet resistance due to friction will be reduced by this design of the drain. As the inlets 308 are arranged at different levels, and the lids 306 have different buoyancy, the inlets 308 open at different levels of water in the manhole.Figure 9 and 10 show another alternative embodiment of the drain, wherein the lid of the outlet 405 has four sections 406, 407, 408, 409. All sections are connected to a lever 410 having a float 411, wherein the first section 406 will be lifted off the outlet of the drain when the float 411 is at a first level, the second section 407 when the float 411 is at a second level, the third section 408 when the float is at a third level, and the fourth section 409 when the float is at the top level. The sections are shown as surrounding rings of a circle, wherein the first section 406 is a circle, and the other sections 407, 408, 409 are rings surrounding the circle 406. As the sections are lifted off, the cross section of the outlet of the drain becomes larger. In figure 7 the lid is shown when closing the drain, and the different levels are indicated with dotted lines.All embodiments of the lid of the drain shown in figures 3, 4, 6-8 may be arranged on knobs on the top edge of the outlet, and thus the drain will never be completely closed, allowing gravitation drainage until the water level raises above the opening of the drain.The lid according to all embodiments described above and shown in the Figures, may be one or more floats. The necessary buoyancy of the lid will among others depend on the suction of the outlet and the size and number of outlets in one drain, and must thus be calculated when the whole system is designed.The example above is given to illustrate the invention and should not be used to interpret the following claims limiting. The scope of the invention is not limited by the example given above, but the following claims. Modifications and amendments of the invention, being obvious to a person skilled of the art, should also be included in the scope of the invention.
Claims
Patent claims1. System for drainage of surface water, the system comprises a number of manholes being connected to a main pipe leading water to a recipient, characterized in that- each manhole has a drain for leading water from the manhole to the main pipe,- the drain comprises a at least one outlet and a corresponding lid, the lid is limiting the outlet until the water is at a predetermined level in the manhole,- a check valve is arranged downstream of the drain of each manhole, preventing water from entering the manhole from the main pipe, and- at least one air bleeder valve and at least one upwards U-shaped pipe is arranged between a manhole and the recipient.2. System according to claim 1, comprising a number of branch pipes connected to a main pipe leading water to the recipient, characterized in that a number of manholes are connected to each branch pipe, and that the an upwards U-shaped pipe is arranged between the branch pipe and the main pipe.3. System according to claim 1 or 2, characterized in that the air bleeder valve is arranged on the upwards U-shaped pipe.4. System according to any of the preceding claims, characterized in that the lid is connected to a float.5. System according to claim 4, characterized in that the lid is a float.6. System according to any one of the preceding claims, characterized in that each drain has a number of outlets, and that the corresponding lids are limiting the outlets until the water is at different levels in the manhole.
Drawings

Priority

22.05.2018 NO 20180711

Patent classes

IPC classesE03F 1/00E03F 3/00E03F 3/02E03F 5/10E03F 5/20CPC classesE03F 1/00E03F 1/007E03F 3/00E03F 3/02E03F 5/10E03F 5/20

Citations

US 4663056 A (A)NO 20131476 A1 (A1)NO 20141121 A1 (A1)

Applicants, owners and inventors

Owners
AIWELL HOLDING AS
Bjellandveien 14 3172 VEAR NO (TØNSBERG Municipality, Vestfold county)Org. number: 989084267Inventors
Asle Johnsen
Wilhelm Wilhelmsens vei 14 B 3112 TØNSBERG NO (TØNSBERG Municipality, Vestfold county)

Agent

ACAPO ONSAGERS AS
ACAPO ONSAGERS AS

Org. number: 932214636

Name and address are automatically synchronized with the Brønnøysund Register Centre.

Open in The Brønnøysund Register Centre
Edvard Griegs vei 1 5059 BERGEN NO (BERGEN Municipality, Vestland county)
Org. number: 932214636
Reference: P17269NO01

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