EP0395646A1 - Raccords de canalisation anti-racines - Google Patents

Raccords de canalisation anti-racines

Info

Publication number
EP0395646A1
EP0395646A1 EP88908017A EP88908017A EP0395646A1 EP 0395646 A1 EP0395646 A1 EP 0395646A1 EP 88908017 A EP88908017 A EP 88908017A EP 88908017 A EP88908017 A EP 88908017A EP 0395646 A1 EP0395646 A1 EP 0395646A1
Authority
EP
European Patent Office
Prior art keywords
dinitroaniline
article
pipe joint
elastomeric material
trifluralin
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
EP88908017A
Other languages
German (de)
English (en)
Inventor
Frederick G. Burton
Dominic A. Cataldo
John F. Cline
W. Eugene Skiens
Peter Van Voris
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.)
Battelle Memorial Institute Inc
Original Assignee
Battelle Memorial Institute Inc
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 Battelle Memorial Institute Inc filed Critical Battelle Memorial Institute Inc
Publication of EP0395646A1 publication Critical patent/EP0395646A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L21/00—Joints with sleeve or socket
    • F16L21/02—Joints with sleeve or socket with elastic sealing rings between pipe and sleeve or between pipe and socket, e.g. with rolling or other prefabricated profiled rings
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear

Definitions

  • U.S. patent application Serial Number 555,113 is directed to the long term control of root growth to prevent intrusion of roots into unwanted areas.
  • One of the embodiments disclosed therein is the prevention of intrusion into underground pipelines, particularly storm sewers, domestic sewage lines, septic tank drain fields, and so forth. This application is a more detailed embodi- ment of that portion of the above application.
  • This invention involves the exclusion of roots by positioning, in the joints of the pipes, an organic polymer mixed with a dinitroaniline.
  • the dinitroaniline slowly diffuses from the polymer at a sufficient rate to keep roots away from the joints, but sufficiently slowly to cause the protection to last for many years.
  • the dinitroanilines do not trans ⁇ locate within the plants and kill them, as do other herbi ⁇ cides, such as 2,4-dichlorophenoxy acetic acid (2,4-D).
  • the preferred dinitroaniline is N,N-di-n-propyl-4-trifluoro- methyl-2,6-dinitroaniline, having the common name tri- fluralin and sold under the trademark Treflan.
  • a suitable polymer is polyethylene.
  • elastomeric gaskets is polyethylene.
  • the preferred elastomer is a mixture of natural rubber and synthetic polyisoprene (natural rubber is com ⁇ posed largely .of polyisoprene).
  • Other suitable elastomers are styrene-butadiene rubbers (SRB), butyl rubber, chloro- prenes, nitril rubbers (NBR), ethylene-propylene, or olefin elastomers (EPM,EPDM) , chlorosulfonated polyethylene, aer late-butadienes, the thermoplastic elastomers such as those sold under the trade name "Santoprene", for instance the "dynamically vulcanized" mixture of thermo- plastic polyolefins and vulcanized mono-olefin copolymers disclosed in U.S. Patent 4,130,535.
  • Figure 1 is a perspective view of an experimental setup testing the invention.
  • Figures la and lb are perspective views of the end of the experi ⁇ mental setup of Figure.1.
  • Figure 2 is a cross section of a ring containing a uniform distribution of herbicide.
  • Figure 3 is a cross section of a gasket containing small pellets of the polyethylene-herbicide mixture.
  • Figure 4 is a cross section of a gasket containing a core of polyethylene-herbicide.
  • Figure 5 is a longitudinal section of a pipe joint comprising one of our gaskets.
  • this invention involves the use of annular bodies of organic polymer mixed with a dinitroaniline which are inserted in pipe joints to prevent penetration by roots.
  • the polymer can be polyethylene. Since sealing is not required in these situations, the elasticity of the material is not important. Therefore, the polyeth ⁇ ylene can contain from 2 to 30% dintroaniline, preferably trifluralin.
  • a simple cross section of a ring for use in this situation is shown in Figure 2. In this case it may be a simple- mixture of the dinitroaniline with either high or low density polyethylene and, preferably, carbon black. While we have shown, in Figure 2, a circular cross section, this is simply for convenience, and the actual cross section may be whatever is most convenient for the above application.
  • the effective life of a material consisting of polyethylene containing uniformly distributed 25% trifluralin and 25% carbon black will be from 50 to 100 years for a ring having a cross section of 1/4 sq. in. Rings of smaller cross section, those containing lower proportions of the herbicide, or dinitroanilines having a higher diffusion rate in polyethylene than tri ⁇ fluralin will give a lower lifetime.
  • the ring When the joints are in sewer lines or other under- ground lines which require sealed joints, the ring must be of an elastic gasket material.
  • a preferred mixture is synthetic polyisoprene or a mixture of synthetic polyi ⁇ soprene with natural rubber (which is primarily a natural polyisoprene).
  • the amount of trifluralin given above has been found .to adversely affect the elasticity of the gasket material and the amount is therefore limited to an upper limit of 5% by weight. We have therefore conducted experiments with this and smaller proportions in order to obtain data in this lower concentration.
  • FIG 1 we have shown a "microcosm assembly" which is used to test under greenhouse conditions the effectiveness of gaskets prepared as above.
  • a box tube having one side 4 made of clear plastic and the other sides of marine plywood was con ⁇ structed.
  • a hinged plywood door 6 fitted over the clear panel 4 so as to shut off light, but permit opening for inspection.
  • Within the box was a 20cm (8 inch) PVC elbow fitted with a 1.6cm (5/8 inch) diameter cap.
  • the gasket was attached by a clear silicone adhesive to the transparent panel.
  • the box was filled with soil.
  • the gasket 10 was perforated at three locations (both sides and top) to permit water contained within the pipe to enter the other ⁇ wise dry soil.
  • the holes in the gasket were 0.63 cm (1/4 inch) in diameter to optimize the potential for penetration of roots through the gasket into the pipe.
  • Several radial series 12 of plugged holes are provided in the clear panel 4 to facilitate the taking of samples.
  • the box 2 was filled with soil and planted with yellow willow (Salix alba variety Vitellina), a rather aggressively rooting variety of willows.
  • Figures 2, 3, and 4 we have shown various distributions of the trifluralin in gasket material.
  • Figure 2 shows the embodiment, which has been discussed above, wherein a body of elastomer 20 contains uniformly disseminated herbicide 22.
  • a polyisoprene gasket 5/8 inch in diameter, and containing 3 to 4% trifluralin, roots will be effectively repelled for from 25 to 50 years.
  • the smaller proportions (0.5% and 1%) were effective for shorter times. If it is desired to increase the longevity beyond the 25 to 50 year period, it is necessary to adopt another form of distribution. Two such forms are shown in Figures 3 and 4.
  • the polyisoprene gasket 20 contains uniformly disseminated herbicide 22 in the proportions of 0.5 to 5%. Additionally, it contains particles of polyethylene 24. These may contain 10 to 30% dinitro ⁇ aniline, preferably about 25% trifluralin. Still another embodiment is ⁇ shown in Figure 4. Again the gasket 20 contains the uniformly distributed dinitroaniline 22 in the amount of 0.5 to 5%. Furthermore, it is provided with a core 26 of polyethylene which, like the particles 24, may contain from 10% to 30% dinitroaniline preferably 25% trifluralin. In all cases it is desirable to include carbon black in very finely divided form in an amount approximately equal to the amount of dinitroaniline to improve retention. This is particularly the case in the particles or core containing large proportions of the herbicide.
  • the carbon blacks which are used are typical "rubber grade furnace blacks" which have ultimate particle sizes of 19 to about 95 nm but which are aggregated and agglomerated to varying degrees. They are typically supplied for use in- agglomerates of about 30 to 300 microns in size. These agglomerates are, however, broken up during the processing. In the embodiments of Figures 3 and 4, the herbicide will slowly diffuse from the polyethylene 24 or 26 and continuously replenish that in the body of the gasket material. It appears that lives up to 100 years of repellency can be obtained in-these manners.
  • FIG 5 we show a root-repelling gasket as mounted in a concrete pipe joint.
  • the gasket 30 is com ⁇ pressed between the bell 32 and the spigot 34 of the joint.
  • the originally circular gasket is highly compressed and the release of the herbicide is over a relatively small section as indicated by the arrows 36.
  • the temperature of the soil surrounding the gasket will most probably range between 10° and 13°C (50 to 55°F). This relatively low temperature contributes to the long life by producing a low release rate and subsequent decompo ⁇ sition of the dinitroanaline.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Sealing Material Composition (AREA)
  • Gasket Seals (AREA)

Abstract

Des raccords de canalisation anti-racines sont utilisés pour empêcher l'entrée des racines dans les canalisations souterraines. Ces raccords sont constitués par un élément annulaire fabriqué dans un polymère organique mélangé avec une quantité efficace de dinitroaniline. La dinitroaniline diffuse à partir du polymère assez rapidement pour empêcher les racines de se rapprocher des raccords mais aussi assez lentement pour que la protection ainsi assurée dure de nombreuses années sans que le produit ne pénètre das les plantes et les tue.
EP88908017A 1987-09-01 1988-08-18 Raccords de canalisation anti-racines Ceased EP0395646A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US9191887A 1987-09-01 1987-09-01
US91918 1987-09-01

Publications (1)

Publication Number Publication Date
EP0395646A1 true EP0395646A1 (fr) 1990-11-07

Family

ID=22230301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88908017A Ceased EP0395646A1 (fr) 1987-09-01 1988-08-18 Raccords de canalisation anti-racines

Country Status (5)

Country Link
EP (1) EP0395646A1 (fr)
JP (1) JPH04502054A (fr)
CA (1) CA1323770C (fr)
WO (1) WO1989002050A1 (fr)
ZA (1) ZA886290B (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004026013B4 (de) * 2004-05-27 2007-05-03 Theodor Cordes Gmbh & Co Kg Erdverlegbare Rohrleitung mit Wurzelschutz, und Verfahren zum Verlegen einer Rohrleitung
JP2006090374A (ja) * 2004-09-22 2006-04-06 Takiron Co Ltd 地中管構造
FR2961660B1 (fr) * 2010-06-23 2013-02-08 Berkem Dev Barriere de protection souple
WO2013101721A1 (fr) * 2011-12-29 2013-07-04 Firestone Building Products Co., LLC Produit d'étanchéité ou ruban résistant au percement des racines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880176A (en) * 1971-03-10 1975-04-29 Airrigation Eng Apparatus for sewer treatment to kill tree roots and other organic growth therewithin
DE2444821A1 (de) * 1974-09-19 1976-04-08 Schering Ag Verwendung von tributylzinnverbindungen als wurzelabweisende mittel in dichtungs- und vergussmassen auf bituminoeser basis
US4657582A (en) * 1985-05-30 1987-04-14 Pennwalt Corporation Polyhydroxy polymer delivery systems

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8902050A1 *

Also Published As

Publication number Publication date
WO1989002050A1 (fr) 1989-03-09
ZA886290B (en) 1989-07-26
CA1323770C (fr) 1993-11-02
JPH04502054A (ja) 1992-04-09

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