EP0204272A2 - An intercepting sewer for conducting waste water down steep gradients - Google Patents

An intercepting sewer for conducting waste water down steep gradients Download PDF

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Publication number
EP0204272A2
EP0204272A2 EP86107361A EP86107361A EP0204272A2 EP 0204272 A2 EP0204272 A2 EP 0204272A2 EP 86107361 A EP86107361 A EP 86107361A EP 86107361 A EP86107361 A EP 86107361A EP 0204272 A2 EP0204272 A2 EP 0204272A2
Authority
EP
European Patent Office
Prior art keywords
intercepting sewer
waste water
sewer
steep gradients
water down
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.)
Granted
Application number
EP86107361A
Other languages
German (de)
French (fr)
Other versions
EP0204272B1 (en
EP0204272A3 (en
Inventor
Alberto Malavasi
Giorgio Iapella
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.)
Costruzioni Montaggi Impianti Speciali Comis Srl
SIMPLAST SpA
Original Assignee
Costruzioni Montaggi Impianti Speciali Comis Srl
SIMPLAST SpA
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Filing date
Publication date
Application filed by Costruzioni Montaggi Impianti Speciali Comis Srl, SIMPLAST SpA filed Critical Costruzioni Montaggi Impianti Speciali Comis Srl
Priority to AT86107361T priority Critical patent/ATE49254T1/en
Publication of EP0204272A2 publication Critical patent/EP0204272A2/en
Publication of EP0204272A3 publication Critical patent/EP0204272A3/en
Application granted granted Critical
Publication of EP0204272B1 publication Critical patent/EP0204272B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F3/00—Sewer pipe-line systems
    • E03F3/04—Pipes or fittings specially adapted to sewers

Definitions

  • the invention relates to an intercepting sewer for conveying waste water down steep slopes.
  • fall pits permits the inclination of a pipe line to be reduced, section by section, so as to bring the intercepting sewer to the desired depth whenever this latter would approach too much to a surface level.
  • such an approach leads to significant final design costs and to difficulties in achieving the work, especially when it is to be carried out in a built-up area, since in this case in addition to depper digging operations involving added charges, there is special works to be taken into account in order to prevent neighbouring edifices from being damaged.
  • the object of the invention is to provide a branch sewer which is so designed that - the flow rate and the slope being the same - it permits the flow velocity to be reduced without having recourse to any head pits and without requiring increased pipe diameter or other provisions which will affect economy of the work.
  • the intercepting sewer, or sewer trunk line for conveying waste water down steep slopes is essentially caharacterized in that it has projections provided inside thereof.
  • these projections are arranged circumferentially, are equidistant and are geometrically configurated so as to give rise to a generalized turbulence in the flow and to localized losses of head whereby any indesirable kinetik energy can be dissipated.
  • the intercepting sewer in question has a maximum inside diameter of 37 cm and is provided with internal protrusions having a mean distance between the centers of 13.2 cm and a jutting-out thickness of 0.85 cm (thus, minimum diameter of intercepting-sewer at projectins, 35.3 cm and mean diameter, 36.15 cm), the intercepting sewer being laid at 10% slope.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Health & Medical Sciences (AREA)
  • Sewage (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Removal Of Specific Substances (AREA)
  • Heat Treatment Of Water, Waste Water Or Sewage (AREA)
  • Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
  • Artificial Fish Reefs (AREA)
  • Endoscopes (AREA)

Abstract

An intercepting sewer for conveying waste waterthrough steep gradients is essentially characterized in that it has projections provided therein.
More particularly, the projections are arranged circumferentially, are equidistant and are geometrically designed so as to give rise to generalized turbulence within the flow and to localized losses of head thereby to dissipate any indesirable kinetik energy.

Description

  • The invention relates to an intercepting sewer for conveying waste water down steep slopes.
  • Installation of a sewer trunk line in steeply sloping ground implies some technical and economical problems to be handled. Most of these are arising from an essential condition that is to limit velocity in the duct to a maximum recommended velocity of 4-5 m/sec.
  • When using conventional pipes of circular cross-section, the problem is handled in part by the provision of fall or head pits along the pipe profile and in part by increasing the cross-sectional surface of an intercepting sewer.
  • The use of fall pits permits the inclination of a pipe line to be reduced, section by section, so as to bring the intercepting sewer to the desired depth whenever this latter would approach too much to a surface level. As is known, such an approach leads to significant final design costs and to difficulties in achieving the work, especially when it is to be carried out in a built-up area, since in this case in addition to depper digging operations involving added charges, there is special works to be taken into account in order to prevent neighbouring edifices from being damaged.
  • Increasing the flow sectional area will lower velocity, due to the smaller hydraulic radius the flow is occupying in moving in the lower portion of pipe line. However, changes are modest in extent and pipes of significantly greater diameter than strictly necessary are to be used which obviously implies far lower filling degrees than applied usually (normal values: about 75%).
  • This type of solution will also be very expensive in the end, due to higher production costs involved (pipe and pipe-laying costs, increased digging and embankment work, laying-bed, rebuilding, etc..) together with servicing costs for the installation to be ma-ntained in a functional state (ordinary and special maintenance).
  • The object of the invention is to provide a branch sewer which is so designed that - the flow rate and the slope being the same - it permits the flow velocity to be reduced without having recourse to any head pits and without requiring increased pipe diameter or other provisions which will affect economy of the work.
  • The above and other objects of the invention will appear to those skilled in the art when reading the following description and claims with reference to the accompanying drawing.
  • The intercepting sewer, or sewer trunk line for conveying waste water down steep slopes, according to the invention, is essentially caharacterized in that it has projections provided inside thereof.
  • More particularly, these projections are arranged circumferentially, are equidistant and are geometrically configurated so as to give rise to a generalized turbulence in the flow and to localized losses of head whereby any indesirable kinetik energy can be dissipated.
  • Referring now to the figure of the accompanying drawing, and in order to substantialize the advantage of the invention, it is supposed that the intercepting sewer in question has a maximum inside diameter of 37 cm and is provided with internal protrusions having a mean distance between the centers of 13.2 cm and a jutting-out thickness of 0.85 cm (thus, minimum diameter of intercepting-sewer at projectins, 35.3 cm and mean diameter, 36.15 cm), the intercepting sewer being laid at 10% slope.
  • From a study of the following table it can, for example, be noted that at flow rate Q = 101.5 1/sec., the velocity V = 2.43 m/sec., whereas by using a conventional intercepting sewer of constant circular section, and with the flow rate Q being the same, in order of achieve the same velocity it would be necessary to provide a 3% slope with conventional intercepting-sewer roughness coefficient of Strickler formula ik 75 and 1.9% slope with i k =95.
    Figure imgb0001

Claims (3)

1. An intercepting sewer for the conveyance of waste water through steep gradients, characterized in that it has projections provide inside thereof.
2. The intercepting sewer according to claim 1, wherein said projections are circumferential projections.
3. The intercepting sewer according to the preceding claims, wherein said circumferential projections are equidistant.
EP86107361A 1985-06-05 1986-05-30 An intercepting sewer for conducting waste water down steep gradients Expired - Lifetime EP0204272B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86107361T ATE49254T1 (en) 1985-06-05 1986-05-30 COLLECTION CHANNEL FOR COLLECTING SEWAGE ALONG STEEP SLOPES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2103485 1985-06-05
IT21034/85A IT1184572B (en) 1985-06-05 1985-06-05 SEWER COLLECTOR FOR THE CONVEYMENT OF WASTEWATER THROUGH SLOPE OVENS

Publications (3)

Publication Number Publication Date
EP0204272A2 true EP0204272A2 (en) 1986-12-10
EP0204272A3 EP0204272A3 (en) 1987-06-10
EP0204272B1 EP0204272B1 (en) 1990-01-03

Family

ID=11175709

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86107361A Expired - Lifetime EP0204272B1 (en) 1985-06-05 1986-05-30 An intercepting sewer for conducting waste water down steep gradients

Country Status (5)

Country Link
EP (1) EP0204272B1 (en)
AT (1) ATE49254T1 (en)
DE (1) DE3668023D1 (en)
ES (1) ES294598Y (en)
IT (1) IT1184572B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202298A (en) * 1987-03-12 1988-09-21 Score Pipeline pigs
WO2011163605A2 (en) * 2010-06-24 2011-12-29 Isco Industries, Llc Modified pipe inlet
CN103074933A (en) * 2012-07-27 2013-05-01 广东联塑科技实业有限公司 Drainage and pollution discharge trough
JP2016156128A (en) * 2015-02-23 2016-09-01 株式会社東芝 Gravity flow type sewer pipe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB556707A (en) * 1942-04-07 1943-10-18 Douglas Whitaker Improvements in or relating to drainage and sewerage systems and pipes therefor
GB1264607A (en) * 1970-04-22 1972-02-23
WO1981001736A1 (en) * 1979-12-10 1981-06-25 E Nordstroem Pipe of plastic material with bulgings
DE3400348A1 (en) * 1984-01-07 1985-07-18 Harzer Betonwarenfabrik Luise Kleinbongardt KG, 3387 Vienenburg Shaped part of concrete, ceramic compounds or the like

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB556707A (en) * 1942-04-07 1943-10-18 Douglas Whitaker Improvements in or relating to drainage and sewerage systems and pipes therefor
GB1264607A (en) * 1970-04-22 1972-02-23
WO1981001736A1 (en) * 1979-12-10 1981-06-25 E Nordstroem Pipe of plastic material with bulgings
DE3400348A1 (en) * 1984-01-07 1985-07-18 Harzer Betonwarenfabrik Luise Kleinbongardt KG, 3387 Vienenburg Shaped part of concrete, ceramic compounds or the like

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202298A (en) * 1987-03-12 1988-09-21 Score Pipeline pigs
GB2202298B (en) * 1987-03-12 1991-05-29 Score Pipeline pigs
WO2011163605A2 (en) * 2010-06-24 2011-12-29 Isco Industries, Llc Modified pipe inlet
WO2011163605A3 (en) * 2010-06-24 2012-04-12 Isco Industries, Llc Modified pipe inlet
US8973616B2 (en) 2010-06-24 2015-03-10 Isco Industries, Inc. Modified pipe inlet
CN103074933A (en) * 2012-07-27 2013-05-01 广东联塑科技实业有限公司 Drainage and pollution discharge trough
CN103074933B (en) * 2012-07-27 2015-12-02 广东联塑科技实业有限公司 A kind of draining dirt discharge groove
JP2016156128A (en) * 2015-02-23 2016-09-01 株式会社東芝 Gravity flow type sewer pipe

Also Published As

Publication number Publication date
EP0204272B1 (en) 1990-01-03
EP0204272A3 (en) 1987-06-10
ATE49254T1 (en) 1990-01-15
IT8521034A0 (en) 1985-06-05
DE3668023D1 (en) 1990-02-08
ES294598Y (en) 1987-07-01
IT1184572B (en) 1987-10-28
ES294598U (en) 1986-10-16

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