Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
  • H02G3/02—Details
  • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
• • 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
  • F16L11/00—Hoses, i.e. flexible pipes
  • F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
  • F16L11/12—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting
  • F16L11/121—Hoses, i.e. flexible pipes made of rubber or flexible plastics with arrangements for particular purposes, e.g. specially profiled, with protecting layer, heated, electrically conducting specially profiled cross sections
• • 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
  • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
  • F16L3/26—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting the pipes all along their length, e.g. pipe channels or ducts
• • 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
  • F16L9/00—Rigid pipes
  • F16L9/12—Rigid pipes of plastics with or without reinforcement
  • F16L9/121—Rigid pipes of plastics with or without reinforcement with three layers
• • 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
  • F16L9/00—Rigid pipes
  • F16L9/12—Rigid pipes of plastics with or without reinforcement
  • F16L9/133—Rigid pipes of plastics with or without reinforcement the walls consisting of two layers
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
  • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
  • G02B6/4439—Auxiliary devices
  • G02B6/4459—Ducts; Conduits; Hollow tubes for air blown fibres
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
  • H02G3/02—Details
  • H02G3/04—Protective tubing or conduits, e.g. cable ladders or cable troughs
  • H02G3/0462—Tubings, i.e. having a closed section
  • H02G3/0481—Tubings, i.e. having a closed section with a circular cross-section
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
  • H02G9/00—Installations of electric cables or lines in or on the ground or water
  • H02G9/06—Installations of electric cables or lines in or on the ground or water in underground tubes or conduits; Tubes or conduits therefor

Definitions

• the present invention relates to an elongated tubular product, generally having the same section along its entire longitudinal direction, and comprising a solid tube, constituted by at least one plastic material, at the same time flexible enough to be itself wound up. and unrolled, and rigid enough to withstand itself a centripetal or centrifugal radial force.
• the present invention intends to group under the same concept, for example both an installation conduit, of at least one cable or a pipe, then contained in said installation conduit, that a sheath of protection of at least one cable, for example electrical.
• the present invention intends to cover any conduit generally ensuring the transfer or the transport of a flow, whether it is a fluid (water or gas by example), energy (electricity for example), or information or signals (video transmission by optical cable for example), or data in the form of electrical, analog, digital signals, etc.
• a fluid water or gas by example
• energy electricity for example
• information or signals video transmission by optical cable for example
• data data in the form of electrical, analog, digital signals, etc.
• the surface layer consists of a lubricating film or coating, either solid or liquid.
• a lubricating film or coating this is for example a polyethylene plastic matrix in which solid particles, for example graphite, can be distributed.
• a lubricating liquid coating this is for example a silicone-based oil.
• the document EP 0 326 711 describes a solution comparable to that defined above, in the sense that the solid surface layer constitutes the internal layer of a tube coextruded with an external layer.
• the surface layer consisting of a lubricating grease or paste, but adherent, is added and remains on the inside of the tube.
• This lubricating paste or grease itself consists of a mixture of a liquid lubricant and particles of a solid lubricant.
• the present invention relates to an elongated tubular product, with an almost dry, permanent lubrication, of the friction surface (s) of the solid tube, significantly reducing friction, including compared to the solutions previously identified and discussed.
• a synergistic action has been discovered for this purpose between: - on the one hand, particles of a lubricant of a solid nature, distributed in the plastic matrix of the surface layer, and at least partly flush with the free surface thereof, and on the other hand, a lubricant of a liquid nature, compatible with the plastic matrix, dispersed in the surface layer, practically without wetting the free surface of the latter.
• an installation conduit becomes in a way universal, in the sense that it is compatible, without further modification, with all current installation techniques, whether it is drafting techniques, for example with a cable, or blowing techniques, for example with a ferret, or by blowing-pushing.
• the lubricant system according to the invention makes it possible to eliminate, at least in part, the static charges generated by the friction between the conduit and the cable, during installation. of the last.
• the present invention also has the following secondary characteristics: the solid lubricant has a lamellar structure, and is for example graphite, or also has a polymer structure with long, straight, oriented chains, and is for example a polytetrafluoroethylene,
• the particles of the solid lubricant are micro-beads having a diameter at most equal to 20 ⁇ m, and preferably between 1 and 15 ⁇ m,
• the liquid lubricant is preferably but not exclusively a silicone; it has a viscosity at most equal to 1000 centisto es, at room temperature, and for example between 10 and 1000 centistokes; the thickness of the liquid lubricant film on the free surface of the surface layer does not exceed 1 ⁇ m,
• the solid lubricant constitutes a filler, the surface layer is irregular along the periphery of the solid tube, and corresponds for example to longitudinal ribs or grooves; but this same surface layer can be continuous, following the periphery of the solid tube.
• the solid tube which is constituted by the single plastic matrix, in which, on the one hand, particles of the dry lubricant are distributed, partially flush with at least one free surface, interior or exterior, and constituting a dry friction surface, and on the other hand a liquid lubricant is diffused, practically without wetting, neither the outer surface nor the inner surface of this same matrix.
• the solid lubricant constitutes a filler, the weight proportion of which is at least equal to 5% of the plastic matrix, in particular between 5% by weight and 20% by weight of this same matrix.
• the matrix comprises, in the diffused state, a liquid lubricant, which constitutes a sort of additive, its proportion being at least equal to 0.02% by weight of the plastic matrix, and in particular included between 0.02% by weight and 0.08% by weight of this same matrix.
• a liquid lubricant which constitutes a sort of additive, its proportion being at least equal to 0.02% by weight of the plastic matrix, and in particular included between 0.02% by weight and 0.08% by weight of this same matrix.
• the proportion of solid lubricant / liquid lubricant is at least equal to 5% and is in particular between 5% and 20%.
• FIG. 1 shows schematically, in axial section an installation conduit according to
• FIG. 2 shows in axial section a cable protection sheath according to the invention
• FIG. 3 represents in cross section an installation sheath according to the invention, but according to another embodiment of the latter,
• an installation duct is constituted by a solid or rigid tube 1, made of charged plastic material (for example high density polyethylene), both sufficiently flexible to be itself wound and unwound, and sufficiently rigid to withstand itself a centripetal or centrifugal radial force.
• This solid tube has a dry friction surface, corresponding to its interior surface.
• a surface layer 3 at least is formed, the free surface of which constitutes the dry friction surface (internal surface 2).
• This surface layer comprises a plastic matrix, corresponding to that of the solid tube, in which particles 4 (micro-balls) of a solid lubricant are distributed, partly flush with the free surface 2.
• an installation duct according to the invention, represented in FIG. 3, the latter comprises three concentric layers 6, 7 and 8, optionally constituted by respectively different plastics, one exterior 7, the other inner 6, in which the surface layer 3 is integrated, and the other median or intermediate 8.
• the surface layer 3 is discontinuous, following the periphery of the solid tube 1, and includes, for example, ribs 9 or adjacent, longitudinal.
• this same surface layer 3 can be continuous, following the periphery of the solid tube 1.
• the surface layer 3 is obtained by projecting or diffusing at inside the tube 1, after extrusion but in the visco-elastic phase, the solid lubricant, in particulate form, mixed with the liquid lubricant.
• the solid lubricant and the liquid lubricant are incorporated into the plastic matrix of the tube, at least on the surface.
• HDPE high density polyethylene
• PCD having an inner diameter of 27 mm and a thickness of 3 mm, is extruded on a CMS60 machine of the
• a suspension of a polytetrafluorethylene (PTFE) powder (commercial reference UNILUB T3 of the Company UNIFLON) having an average particle size of 16 ⁇ m, in a silicone oil (commercial reference 47V100 of the Company PENN HITE) having a viscosity of 100 censtistokes, is projected in divided form inside the extruded tube, while it is still viscoelastic.
• PTFE powder represents 20% by weight (PTFE) relative to the oil.
• the coefficient of friction between the internal surface of such a tube, compared to a HDPE sheath (same commercial reference as above) is 0.075.
• the PTFE powder and the silicone oil act in synergistic action to reduce the coefficient of friction, because: the coefficient of friction obtained, without treatment of the internal surface of the tube is 0.19, the coefficient of friction obtained, with projection of the silicone oil alone is 0.102.
• EXAMPLE 2
• an 8 mm cable is pushed by blowing, with a ferret.
• the interior surface of the installation duct is coated with the liquid lubricant (silicone oil), identified in Example 1.
• the interior surface is coated with a solid, identical lubricant powder to that of Example 1.
• An installation conduit made of high density polyethylene, with an internal diameter of 27 mm and a thickness of 3 mm, is used for an installed cable with an external diameter of 17.6 mm, with a coating of the internal surface of the conduit, firstly with a silicone oil having a viscosity of lOOCp, secondly with a Teflon® powder of 10 ⁇ m particle size, and thirdly with a mixture of powder in the abovementioned oil, up to 10% by weight of the powder relative to in oil.
• the friction coefficients measured, when pushing / carrying the cable are respectively 0.102; 0.071 and 0.0061.
• a lubricant mixture comprising a liquid lubricant (silicone) having a viscosity of 100 Cp, and an increasing proportion by weight of a solid lubricant (Teflon® powder having the same particle size as previously, namely 5, 10, 15 and 20% by weight respectively .
• the coefficients of friction measured during the blowing / carrying of the cable are respectively 0.086; 0.085; 0.089; 0.090.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Architecture (AREA)
• Civil Engineering (AREA)
• Structural Engineering (AREA)
• Physics & Mathematics (AREA)
• Optics & Photonics (AREA)
• General Physics & Mathematics (AREA)
• Lubricants (AREA)
• Rigid Pipes And Flexible Pipes (AREA)
• Laminated Bodies (AREA)
• Insulated Conductors (AREA)
• Electric Cable Installation (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Priority Applications (12)

Applications Claiming Priority (2)

Publications (1)

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ID=9504986

Family Applications (1)

Country Status (24)

Cited By (4)

Families Citing this family (8)

Citations (5)

Family Cites Families (1)

• 1997
  • 1997-03-14 FR FR9703372A patent/FR2760814B1/fr not_active Expired - Fee Related
• 1998
  • 1998-03-13 RU RU99121657/09A patent/RU2189098C2/ru not_active IP Right Cessation
  • 1998-03-13 GB GB9919234A patent/GB2337367B/en not_active Expired - Fee Related
  • 1998-03-13 SI SI9820024A patent/SI20133A/sl not_active IP Right Cessation
  • 1998-03-13 RO RO99-00973A patent/RO120440B1/ro unknown
  • 1998-03-13 NZ NZ337348A patent/NZ337348A/en unknown
  • 1998-03-13 WO PCT/FR1998/000519 patent/WO1998042052A1/fr not_active IP Right Cessation
  • 1998-03-13 PL PL98334903A patent/PL334903A1/xx unknown
  • 1998-03-13 CH CH01678/99A patent/CH693801A5/fr not_active IP Right Cessation
  • 1998-03-13 HU HU0002341A patent/HUP0002341A3/hu unknown
  • 1998-03-13 EE EEP199900407A patent/EE9900407A/xx unknown
  • 1998-03-13 UA UA99105579A patent/UA57069C2/uk unknown
  • 1998-03-13 BR BR9806324-3A patent/BR9806324A/pt not_active IP Right Cessation
  • 1998-03-13 KR KR1019997008304A patent/KR20000076210A/ko not_active Application Discontinuation
  • 1998-03-13 JP JP54019698A patent/JP2001521604A/ja active Pending
  • 1998-03-13 CZ CZ992510A patent/CZ251099A3/cs unknown
  • 1998-03-13 TR TR1999/02238T patent/TR199902238T2/xx unknown
  • 1998-03-13 ES ES009950044A patent/ES2154612B1/es not_active Expired - Lifetime
  • 1998-03-13 AU AU69234/98A patent/AU741152B2/en not_active Ceased
  • 1998-03-13 SK SK1214-99A patent/SK283429B6/sk unknown
  • 1998-03-13 ID IDW991178A patent/ID22695A/id unknown
  • 1998-03-13 DE DE19882152T patent/DE19882152T1/de not_active Withdrawn
• 1999
  • 1999-09-10 LT LT99-111A patent/LT4659B/lt not_active IP Right Cessation
  • 1999-09-14 LV LVP-99-130A patent/LV12425B/lv unknown

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