EP0204272B1 - 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
EP0204272B1
EP0204272B1 EP86107361A EP86107361A EP0204272B1 EP 0204272 B1 EP0204272 B1 EP 0204272B1 EP 86107361 A EP86107361 A EP 86107361A EP 86107361 A EP86107361 A EP 86107361A EP 0204272 B1 EP0204272 B1 EP 0204272B1
Authority
EP
European Patent Office
Prior art keywords
waste water
sewer
intercepting sewer
water down
steep gradients
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.)
Expired - Lifetime
Application number
EP86107361A
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German (de)
French (fr)
Other versions
EP0204272A3 (en
EP0204272A2 (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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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
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Classifications

    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F3/00Sewer pipe-line systems
    • E03F3/04Pipes or fittings specially adapted to sewers

Definitions

  • the invention relates to an intercepting sewer for conveying waste water down steep slopes.
  • GB-A-556 707 discloses a drainage or sewerage pipe whose main object is to reduce the fall. This is achieved by means of the retention of pools of liquid or moisture in the pipes after the flow through same has ceased. The pools are obtained by shaping the inner surface of this pipe frusto-conically. Therefore the inner diameter of the pipe gradually changes along its length.
  • WO-A-8 101 736 discloses a plastic pipe whose walls have a uniform thickness along all of its length.
  • the outer surface of the pipe generally has not a cylindrical shape since bulgings alternate with cylindrical portions, as shown in the figures.
  • This particular shape of the pipe aims at reducing the consumption of plastic material and, as a consequence, the weight of the pipe in comparison with conventional pipes.
  • the same amount of liquid substantially flows through the known pipe as it does through a pipe with smooth inner surface.
  • the waste water contains the most heterogeneous suspended materials which, particularly in the case of steep slopes, perform a significant abrasive action on the sewer's inner surface.
  • the flow speed has to be reduced. This is achieved by means of projections provided inside the piping or sewer in the invention. Therefore, the aim of the present invention is completely different, actually the opposite one, with respect to the above documents which aims to not reduce the flow speed.
  • the sewer in the present invention has a substantially better resistance to abrasion in comparison with that of the pipe cited in the WO-A-8 101 736.
  • the main advantage of the present invention is that there is no need for head pits also in the case of 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 deeper 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.
  • an intercepting sewer for the conveyance of waste water down steep gradients having a smooth outer surface and inner projections, characterized in that a succession of substantially identical circumference projections are provided, said circumferential projections defining a passage having a predetermined diameter and alternating with annular grooves having a substantially uniform diameter.
  • 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 projections, 35.3 cm and mean diameter, 36.15 cm), the intercepting sewer being laid at 10% slope.

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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)
  • 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 water through 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.
  • GB-A-556 707 discloses a drainage or sewerage pipe whose main object is to reduce the fall. This is achieved by means of the retention of pools of liquid or moisture in the pipes after the flow through same has ceased. The pools are obtained by shaping the inner surface of this pipe frusto-conically. Therefore the inner diameter of the pipe gradually changes along its length.
  • WO-A-8 101 736 discloses a plastic pipe whose walls have a uniform thickness along all of its length. The outer surface of the pipe generally has not a cylindrical shape since bulgings alternate with cylindrical portions, as shown in the figures. This particular shape of the pipe aims at reducing the consumption of plastic material and, as a consequence, the weight of the pipe in comparison with conventional pipes. The same amount of liquid substantially flows through the known pipe as it does through a pipe with smooth inner surface.
  • It is an object of the present invention to provide an intercepting sewer for the conveyance of waste water, down steep slopes, at relatively low flow speed. As known, the waste water contains the most heterogeneous suspended materials which, particularly in the case of steep slopes, perform a significant abrasive action on the sewer's inner surface. In order to reduce the abrasion, the flow speed has to be reduced. This is achieved by means of projections provided inside the piping or sewer in the invention. Therefore, the aim of the present invention is completely different, actually the opposite one, with respect to the above documents which aims to not reduce the flow speed. Moreover, the sewer in the present invention has a substantially better resistance to abrasion in comparison with that of the pipe cited in the WO-A-8 101 736.
  • Compared to the pipes above, the main advantage of the present invention is that there is no need for head pits also in the case of 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/s.
  • 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 deeper 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 imples 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 maintained 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 above objects are achieved by an intercepting sewer for the conveyance of waste water down steep gradients having a smooth outer surface and inner projections, characterized in that a succession of substantially identical circumference projections are provided, said circumferential projections defining a passage having a predetermined diameter and alternating with annular grooves having a substantially uniform diameter.
  • 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 projections, 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 I/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 to 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 ik=95.
    Figure imgb0001

Claims (1)

  1. An intercepting sewer for the conveyance of waste water down steep gradients having a smooth outer surface and inner projections, characterized in that a succession of substantially identical circumferential projections are provided, said circumferential projections defining a passage having a predetermined diameter and alternating with annular grooves having a substantially uniform diameter.
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
IT21034/85A IT1184572B (en) 1985-06-05 1985-06-05 SEWER COLLECTOR FOR THE CONVEYMENT OF WASTEWATER THROUGH SLOPE OVENS
IT2103485 1985-06-05

Publications (3)

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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8705880D0 (en) * 1987-03-12 1987-04-15 Score Uk Ltd Pipeline pigs
US8973616B2 (en) 2010-06-24 2015-03-10 Isco Industries, Inc. Modified pipe inlet
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
JP6382742B2 (en) * 2015-02-23 2018-08-29 株式会社東芝 Natural flow sewer pipe

Family Cites Families (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
SE7910162L (en) * 1979-12-10 1981-06-11 Nordstroem Erik G W OF PLASTIC MATERIAL FORMED TUBE WITH TILES AND DEVICE FOR MANUFACTURE OF TUBE
DE3400348C2 (en) * 1984-01-07 1994-03-24 Harzer Betonwarenfabrik Luise Molded part made of concrete, ceramic masses or the like.

Also Published As

Publication number Publication date
EP0204272A3 (en) 1987-06-10
IT1184572B (en) 1987-10-28
ES294598U (en) 1986-10-16
IT8521034A0 (en) 1985-06-05
EP0204272A2 (en) 1986-12-10
ATE49254T1 (en) 1990-01-15
DE3668023D1 (en) 1990-02-08
ES294598Y (en) 1987-07-01

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