WO2018215790A1 - Conduit et procédé d'installation - Google Patents

Conduit et procédé d'installation Download PDF

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Publication number
WO2018215790A1
WO2018215790A1 PCT/GB2018/051431 GB2018051431W WO2018215790A1 WO 2018215790 A1 WO2018215790 A1 WO 2018215790A1 GB 2018051431 W GB2018051431 W GB 2018051431W WO 2018215790 A1 WO2018215790 A1 WO 2018215790A1
Authority
WO
WIPO (PCT)
Prior art keywords
duct
adhesive
invert
tabs
resin
Prior art date
Application number
PCT/GB2018/051431
Other languages
English (en)
Inventor
Derek Muckle
Original Assignee
Radius Systems Limited
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 Radius Systems Limited filed Critical Radius Systems Limited
Publication of WO2018215790A1 publication Critical patent/WO2018215790A1/fr

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Classifications

    • 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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts
    • G02B6/502—Installation methods in fluid conducts, e.g. pipelines
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/02—Manhole shafts or other inspection chambers; Snow-filling openings; accessories
    • E03F5/022—Partitioned to allow more than one medium to flow through
    • 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
    • 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
    • G02B6/46—Processes or apparatus adapted for installing or repairing optical fibres or optical cables
    • G02B6/50—Underground or underwater installation; Installation through tubing, conduits or ducts

Definitions

  • the present invention relates to a duct and to a method of installing a duct in a pipe.
  • the invention relates to a duct for and to a method for installing a duct inside a sewer pipe, such as a non-man entry sewer pipe.
  • a duct for and to a method for installing a duct inside a sewer pipe, such as a non-man entry sewer pipe.
  • One known method is to use one or more robots to install the optical fibre duct using mechanical fixings to hold the optical fibre duct against the wall of the sewer pipe.
  • Some variations of this method comprise drilling a hole in the sewer pipe and using mechanical fixings. Such mechanical fixings may be very similar to those used in man-entry sewers and tunnels.
  • Other variations of this method comprise using different mechanical fixings, such as expanding clamps which are jacked into a locking position and are distributed along a length of the installed optical fibre duct.
  • such methods may not be cost effective for the installation process.
  • Another group of known methods comprise combining installation of the optical fibre duct with one or more common sewer renovation technologies, such as a technique known in the art as cured in place pipe (CIPP) lining.
  • CIPP cured in place pipe
  • These methods comprise first inserting the optical fibre duct into the non-man entry sewer and subsequently inserting a composite liner. The liner is arranged to cover the ducts and the remaining internal surface area of the non-man entry sewer pipe. Finally, the CIPP liner is cured, for example using heat or ultra violet means. Curing changes the structure of the CIPP liner into a more rigid structure. When used in this way the optical fibre duct is concealed between the CIPP linerand the non-man entry sewer pipe.
  • CIPP cured in place pipe
  • CIPP CIPP a relatively expensive method.
  • CIPP CIPP a relatively expensive method.
  • Another group of known methods comprise bonding optical fibre ducts to the sewer using an adhesive.
  • the ducts must be bonded to the bottom of the sewer pipe, known in the art as the "invert" of the non-man entry sewer pipe.
  • This method typically comprises first laying optical fibre ducts to the invert of a sewer pipe and subsequently flooding the sewer with a resin or concrete adhesive to cover the ducts and to fill space between the ducts.
  • NL1018324 in which a small robot is used to spread a protective layer of resin over the duct placed on the sewer invert.
  • WO2014068308 describes a further variation of this theme.
  • one aspect in common with all of these methods is that after installation, the sewer invert effectively becomes flat rather than curved. This can have a negative effect on the operation of the sewer, particularly under conditions of low flow, and can lead to the deposit of silt in the base of the sewer which would not otherwise occur.
  • some variations of this method comprise a first step of milling a groove in the invert into which the ducts can be laid.
  • a resin or concrete filler material may then be used to cover the ducts and to fill space between the ducts.
  • the filler material may finally be trimmed so that it is flush with the internal surface of the sewer and restores the original circular profile of the sewer.
  • DE19752424 describes a method comprising use of a robot to first mill a channel into the sewer invert, to which the ducts are inserted.
  • a resin is subsequently used to fill the channel which is smooth.
  • the resin is finally blended to restore the sewer's original cross sectional shape.
  • optical fibre ducts are generally buoyant. Unless the ducts can be held in position sufficiently to resist the upwards thrust of the buoyant duct whilst the resin or concrete cures, the duct simply rises to the surface of the resin or concrete and sets at that position. This typically requires a second pass operation to apply a second layer to cover the duct entirely. Additionally, typical materials used for optical fibre ducts respond to temperature increases and have a relatively high coefficient of thermal expansion. Curing of two part resin adhesives such as epoxy, polyurethane or polyurea adhesives, which may be employed as the filler material generates exothermic reactions. Consequently, curing the resin may cause the ducts to increase in length.
  • two part resin adhesives such as epoxy, polyurethane or polyurea adhesives
  • the ducts will take on a wavy appearance along the length of the sewer.
  • the wavy appearance of the ducts is undesirable because it will be impractical for blowing optical fibres into the duct at a later date. The problem is exacerbated when relatively large volumes of resin are used, because this leads to significant heat generation.
  • a duct for installation on an invert of a non-man entry sewer pipe comprising: a body having a conduit therethrough; and first and second flexible tabs arranged on an outer surface of said body and flexible with respect thereto, wherein the first and second tabs and a section of the outer surface of the body therebetween define a sealing region for sealing the duct to the invert, the sealing region comprising a mechanical key profile and wherein, in use, first and second flow channels are defined by the first and second flexible tabs respectively.
  • the duct permits fluid flow via said flow channels, even in low flow conditions.
  • the arrangement advantageously increases the velocity of water under low volumetric flow conditions, thereby providing a scouring or self-cleaning effect and to minimise silting within the flow channels.
  • sealing the body and the first and second tabs to the invert creates a substantially fluid-tight sealed region, the first and second flow channels being outside said sealed region.
  • the mechanical key profile provides, in use, a mechanical anchor between the duct and, for example, an adhesive, thereby strengthening a join between the duct and the invert.
  • the cross-sectional shape and/or material of the mechanical key profile is capable of providing sufficient tensile strength to resist a buoyancy effect of the duct when the duct is adhesively bonded to the invert.
  • this helps to join the duct to the invert in a dose fit.
  • the mechanical key profile comprises one or more protrusions shaped so that when an adhesive is applied between the invert and the sealing region, the adhesive substantially surrounds the protrusions and provides a mechanical anchor between the duct and the invert.
  • this improves joining the duct to the invert, providing a more robust joint.
  • the one or more protrusions comprise one or more substantially T shaped or substantially bulbous protrusions.
  • a T shaped or bulbous protrusion increases surface area of the mechanical key profile, thereby increasing an area for contacting an adhesive. This provides a stronger joint between the duct and the invert.
  • the mechanical key profile is integrally formed with the body.
  • the mechanical key profile may, in some embodiments, be axially extruded with the body.
  • the first and second tabs are integrally formed with the body.
  • the first and second tabs may, in some embodiments, be axially extruded with the body.
  • the first and second tabs extend from the outer surface of the body, and movement of the first and second tabs relative to the body is substantially limited to conforming to a shape of a surface of the invert.
  • the first and second tabs are flexible from a first, storage position, in which the first and second tabs are substantially retracted to the body so as to minimise a footprint or profile of the duct, to a second, in use position, in which the first and second tabs are substantially extended from the body, in an anticipated installation orientation.
  • the first and second tabs include a substantially smooth upper surface.
  • the smooth upper surfaces help to prevent catching of objects flowing in the non-man entry sewer pipe, thereby preventing or at least minimizing occurrences of hang-ups and blockages forming in the non-man entry sewer pipe caused by said objects.
  • the first and second tabs each include a concave surface.
  • the first and second tabs comprise ends having a tapering thickness.
  • this provides, in use, a smooth transition between the tabs and the invert surface. This helps to prevent catching of objects flowing in the non-man entry sewer pipe, thereby preventing or at least minimising occurrences of hang-ups and blockages forming in the non-man entry sewer pipe caused by said objects.
  • said body comprises an inner sheath.
  • the inner sheath may be arranged so as not to be in fluid contact with the sewer.
  • the inner sheath may, in some embodiments, comprise one or more functional layers.
  • the inner sheath comprises a moisture barrier layer.
  • the inner sheath comprises a vapour trap layer. In some embodiments, the inner sheath comprises a glass filled layer.
  • a glass filled layer discourages sustained rodent attack to the duct.
  • the inner sheath comprises a layer resistant to permeation.
  • the inner sheath comprises a metallic layer, such as a metallic sheath.
  • the metallic sheath comprises steel.
  • a metallic layer provides armoured protection to resist rodent attack whilst still permitting forming of the duct, such as forming of bends along an installed length of the duct.
  • a metallic layer also advantageously allows the duetto be formed to and to conform to a topography of the non- man entry sewer, to which it may later be bonded.
  • the metallic layer comprises corrugations.
  • the corrugations are arranged so that the metallic layer comprises a substantially wavy profile.
  • metallic layer comprising corrugations maybe more easily coiled, for example onto a drum, without kinking and subsequently uncoiled. This facilitates installation.
  • a metallic layer comprising corrugations also advantageously helps the duct to be easily formed to and to conform to a topography of the non-man entry sewer, to which it may later be bonded. This advantageously enables the duct to be maintained in place whilst the adhesive sets, encouraging the duct to blend with the sewer invert.
  • a metallic layer comprising corrugations may also advantageously improve overall strength of the duct.
  • the corrugations may comprise a profile of square, curved, circular or ovular shape, or any combination thereof.
  • the body comprises an outer sheath.
  • the outer sheath may be in fluid contact with the non-man entry sewer.
  • an outer sheath provides protection to internal components.
  • the outer sheath protects the metallic layer from, for example, corrosion.
  • the outer sheath comprises a polyolefin.
  • the outer sheath is axially extruded.
  • the duct comprises one or more micro-ducts within the body.
  • the duct is an optical fibre duct, or is suitable for conveying opticalfibres through said conduit.
  • a kit comprising a duct as described in any of the preceding paragraphs and an adhesive for sealing the duct to the non-man entry sewer pipe.
  • this provides means for bonding the advantageous duct to the invert.
  • the adhesive comprises a fast setting resin.
  • a fast setting resin prevents or at least minimises movement of the duct during installation, preventing the duct from deviating from a preselected position during installation.
  • said adhesive comprises a two part resin.
  • this allows the resin parts to be stored separately and mixed on site when the duct is ready to be installed on the invert, thereby providing more control over curing the resin.
  • the resin comprises a filler material arranged to scavenge water from the invert without hindering development of a chemical bond between the invert and the duct.
  • a method of manufacturing the duct as described in any of the preceding paragraphs comprising: extruding said body; and coextruding the first and second tabs and the mechanical key profile with said outer sheath layer.
  • coextruding the first and second tabs and the mechanical key profile provides an integral, stable structure and omits the requirement for a second joining step to join tabs or a key profile to the outer sheath layer.
  • said extruding the body may comprises extruding the outer sheath over the inner sheath.
  • the first and second tabs are coextruded in a storage orientation, in which the first and second tabs are substantially retracted to the body so as to minimise a footprint or profile of the duct.
  • a method for installing a duct as above described comprising: arranging the duct along an invert of a non-man entry sewer pipe; and bonding the sealing region of the duct to the invert.
  • the method comprises shaping the duct to substantially match a shape of the invert of the non-man entry sewer pipe.
  • this facilitates installation of the duct.
  • said shaping comprises drawing a guide tool over the duct to move the first and second tabs into a position to substantially match the shape of the invert of the non-man entry sewer pipe.
  • the method comprises cleaning a surface of the invert prior to said arranging and said bonding.
  • this provides a cleaner invert surface on which to bond the sealing region to, thereby providing a more robust joint therebetween.
  • the method comprises roughening a surface of the invert prior to said arranging and said bonding.
  • a roughened invert surface may function as a mechanical key, advantageously improving bonding between the sealing region and the invert.
  • said bonding comprises applying a fast setting adhesive.
  • a fast setting adhesive prevents or at least minimises movement of the duct during installation, preventing the duct from deviating from a preselected position during installation.
  • said bonding comprises applying a two part adhesive.
  • this allows the adhesive parts to be stored separately and mixed on site when the duct is ready to be installed on the invert, thereby providing more control over curing the adhesive.
  • a fast setting adhesive prevents or at least minimises movement of the duct during installation, preventing the duct from deviating from a preselected position during installation.
  • said two part adhesive comprises a two part epoxy adhesive, a two part polyurethane adhesive or a two part polyurea adhesive.
  • said two part polyurethane adhesive is formed by reacting mono di-isocyanate (MDI) with a polyol in the presence of a catalyst.
  • said adhesive comprises one or more hydroscopic fillers for drawing moisture from invert surface to dry sufficiently to enable bonding.
  • said bonding comprises continuously dispensing said adhesive along the invert to adhesively bond the duct to the invert.
  • this ensures that adhesive is applied to an entire length of the invert on which the duct is to be installed.
  • said bonding comprises intermittently dispensing the adhesive along the length of the sealing region of the duct to form adhesive patches or spots.
  • the method comprises thermally conditioning said adhesive prior to said applying.
  • this improves properties of the adhesive, such as reduces the viscosity of the adhesive, thereby making the adhesive more workable.
  • apparatus for installing the duct as described in any of the preceding paragraphs using said method for installing the duct as described in any of the preceding paragraphs, the apparatus comprising: a storage means for storing an adhesive; a heating means for heating the stored adhesive; and a hose for depositing said adhesive, wherein the hose is in fluid connection with said storage means.
  • said heating means enables viscosity of the adhesive to be reduced prior to depositing the adhesive.
  • the apparatus comprises a drum around which said hose is windable and a means for rotatably driving the drum so as to wind the hose around the drum at a substantially constant speed.
  • this enabled the hose to be drawn through the non-man entry sewer pipe, depositing adhesive at a substantially constant rate and therefore a substantially uniform thickness.
  • the apparatus comprises a guide tool fixed to an end of the hose for guiding said depositing of said stored adhesive.
  • said adhesive is a two part resin and said storage means comprises two separate storage tanks, each tank for storing one part of the two part resin.
  • said storage means comprises two separate storage tanks, each tank for storing one part of the two part resin.
  • the apparatus comprises means for mixing the separate parts of the two part resin.
  • said means for mixing may comprise a static impingement mixer in the guide tool.
  • this enables mixing of the two part resin immediately before deposition of said two part resin, thereby minimising any undesired curing of the two part resin prior to deposition of the same.
  • the apparatus may be provided on a mobile trailer.
  • this enables portability of the apparatus.
  • Figure 1 shows a duct according to an embodiment of the
  • Figure 2 shows the duct of Figure 1 fitted to an invert of a non-man entry sewer pipe, according to an embodiment of the invention
  • Figure 3 shows sectional views of a duct according to an embodiment of the invention.
  • Figure 4 shows a method of installing a duct according to an embodiment of the invention.
  • invert may refer to a lowermost point of an internal surface of a cross section of a non-vertical hollow structure, such as a sewer or a drain, at any given longitudinal point.
  • the term “invert” may include a length connecting one or more of said lowermost points along said internal surface. The length may extend from an opening at a first end of in the hollow structure to a second opening at a second end of the hollow structure.
  • the term “invert” may comprise an area extending equally either side of said length. The area may extend so as to define a lowermost substantially hemi-cylindrical area.
  • duct may refer to a conduit arranged to convey one or more components or substances therethrough.
  • the one or more components or substances may comprise any of a wire, a cable, an optical fibre or bundle of optical fibres, a micro-duct and/or fluid.
  • the duct may be arranged to provide protection to the one or more components or substances, such as rodent protection, for example.
  • micro-duct may refer to a conduit arranged to convey one or more components or substances therethrough.
  • the one or more components or substances may comprise optical fibres, for example.
  • micro-duct may refer to a conduit arranged to be conveyed within a duct, the duct having a relatively larger diameter than the micro-duct.
  • flow channel may refer to a region arranged to encourage, or at least permit, fluid flow therealong.
  • the term “flow channel” may include a passage, an opening, a trench, or a groove.
  • the term “flow channel” may include a passage having a substantially curved cross sectional shape, such as a circular, ovular, semi-circular or semi-ovular cross sectional shape, for example.
  • the term “flow channel” may include channels which function to increase velocity of fluid flowing through a non-man entry sewer pipe under low volumetric flow conditions.
  • the term 'mechanical key profile'' may refer to a region or area comprising a non- homogenous surface area and/or a non-uniform cross sectional shape arranged to improve grip between the mechanical key and an adhesive received thereon.
  • a non- homogenous surface area and/or non-uniform cross sectional shape may comprise one or more of: a roughened surface, an undulating surface, a protrusion or an extension, for example.
  • fast setting adhesive may refer to an adhesive substance arranged to bond two components together to substantially resist separation thereof, wherein a primary chemical reaction of said bonding is substantially completed within one minute, preferably, within 30 seconds, of application of the adhesive substance to the two components.
  • fast setting adhesive may include a fast setting resin.
  • the term 'fast setting resin may refer to a curable resin based material arranged to bond two components together to substantially resist separation thereof, wherein a primary chemical reaction of curing the resin based material is substantially completed within one minute, preferably, within 30 seconds, of initiating said curing reaction.
  • the term “fast setting resin” may include two part resin materials arranged to cure on mixing.
  • the term “sealing region” may refer to a region of a duct arranged to be bonded or at least joined to a substrate, such as an invert of a pipe, to create a substantially fluid-tight sealed region.
  • embodiments of the present invention provide a duct 100 for installation on an invert 9 of a non-man entry sewer pipe.
  • the duct 100 is an optical fibre duct, arranged to house optical fibres therein.
  • the duct 100 comprises a body 102.
  • the body 102 comprises one or more micro- ducts 1 .
  • the body 102 comprises a plurality of the micro-ducts 1 , referred to as a bundle of micro-ducts.
  • the duct 100 comprises a first tab 6a and a second tab 6b, arranged on opposed sides of the body 102.
  • the first and second tabs 6a, 6b each define first and second low flow channels 10a, 10b, respectively.
  • the channels 10a, 10b may comprise a substantially curved cross sectional shape, such as a circular, ovular, semi-circular or semi-ovular cross sectional shape, for example.
  • the channels 10a, 10b function to increase velocity of fluid flowing through the non-man entry sewer pipe under low volumetric flow conditions.
  • a sealing region 130 is provided between the first and second tabs 10a, 10b for sealing the body and the first and second tabs to the invert 9, for example by means of adhesive bonding.
  • the sealing region 130 is defined by the underside of the body and the tabs, from the point at which tab 6a contacts the invert 9 to the point at which tab 6b contacts the invert 9. Once bonded to the invert, the sealed region directs the majority of fluid flowing in the non-man entry sewer pipe in low volumetric flow conditions through the low flow channels 10a, 10b.
  • the sealed region itself need not necessarily be completely fluid tight in service.
  • the first and second tabs 6a, 6b are shaped to prevent catching of objects flowing in the non-man entry sewer pipe. This may be achieved by one or more of: the tabs 6a, 6b being provided with substantially smooth surfaces, the tabs being provided with concave surfaces and the tabs being provided with ends having a tapering thickness, for example.
  • the smooth surfaces of the tabs 6a, 6b conveniently cover any roughness of the underlying adhesive which is typically applied in "blobs" having rough peripheral edges that could otherwise interfere with flow in the sewer pipe.
  • the first and second tabs 6a, 6b may initially be formed relative to the body 102 in an anticipated installation orientation such that movement of the first and second tabs 6a, 6b is substantially limited to conforming to a shape of a surface 9' of the invert 9.
  • the first and second tabs 6a, 6b may be moveable, at least from a first, storage position (shown in Figure 1 ), in which the first and second tabs 6a, 6b are arranged tight to the body 102, to a second, use position (shown in Figure 2), in which the first and second tabs 6a, 6b are arranged, relative to the body 102, in an anticipated installation orientation. Movement of the tabs 6a, 6b relative to the body 102 is a result of a degree of flexibility in the material of the tabs.
  • the body 102 may comprise an inner sheath layer 2.
  • the inner sheath layer 2 houses the micro-duct 1 or micro-duct bundles and functions to protect the same.
  • the inner sheath layer 2 may comprise one or more layers having one or more functional properties. In the embodiments shown in Figure 3, three inner sheath layers 2, 3, 4 are provided, although it will be appreciated that fewer or more inner sheath layers may be provided.
  • an optional innermost sheath layer 2 encloses the micro-duct 1 or micro-duct bundles
  • a moisture barrier 3 may be provided for providing protection to the micro-duct 1 or micro-duct bundles from ingress of moisture
  • a corrugated metal sheath 4 may be provided for providing armoured protection to the duct 100 from, for example, rodents and weathering.
  • the corrugated metal sheath allows the duct 100 to be formed to and to conform to a topography of the non-man entry sewer to which it is bonded.
  • the corrugations also allow the duct 100 to be coiled to drums without kinking, and to be uncoiled, inserted and formed to match the topography of the non-man entry sewer.
  • the corrugated metal sheath may be of a square or curved profile to facilitate bending of the duct 100.
  • An outer sheath 5, comprising, for example, a polyolefin, may also be provided to protect the inner sheath layers, including the inner sheath 2, the moisture barrier 3 and the corrugated metal sheath 4, as well as the micro-duct 1 or micro-duct bundles.
  • the first and second tabs 6a, 6b may form an integral part of the outer sheath 5.
  • the first and second tabs 6a, 6b may be axially extruded profiles of the outer sheath 5.
  • the duct 100 is bondable to the surface 9' of the invert 9 by means of an adhesive 8, such as a resin.
  • the resin 8 may be a fast setting resin which may be designed so that a primary chemical reaction of the curing process is completed within one minute.
  • a two part resin that cures upon mixing of the two parts is used to bond the duct 100 to the surface 9' of the invert 9.
  • the resin 8 is suitable for application to damp surfaces without hindering the development of an adhesive bond between the duct 100 and the surface 9' of the invert 9.
  • the resin in some embodiments, comprises a hydroscopic filler material.
  • the filler material is arranged to scavenge water from a substrate, such as the surface 9' of the invert 9, without hindering the development of a chemical bond thereto.
  • the sealing region 130 includes a mechanical key profile.
  • the mechanical key profile is arranged so as to provide sufficient tensile strength to resist a buoyancy effect of the duct 100 when the adhesive 8 is used to bond the duct 100 to the invert 9. This may comprise one or both of using appropriate material selection for the mechanical key profile and providing the mechanical key profile with a suitable cross- sectional shape.
  • the mechanical key profile comprises one or more protrusions 7 extending radially from the outer sheath 5.
  • the protrusions 7 may form an integral part of the outer sheath 5, for example, the protrusions 7 may be axially extruded profiles of the outer sheath 5.
  • the one or more protrusions 7 may comprise one or both of substantially T shaped protrusions and substantially bulbous protrusions. In this way, when the adhesive 8 is applied between the invert 9 and the fixing region 130, the adhesive 8 will envelop the mechanical key profile and will set to provide a mechanical anchor between the duct 100 and the invert 9.
  • the first and second tabs 6a, 6b are at least partially deformable to allow for the duct 100 to be installed on the invert 9.
  • the tabs 6a, 6b are extendable in situ to form the low flow channels 10a, 10b either side of the body 102 of the duct 100.
  • the tabs 6a, 6b extend out from the body 102 and abut the surface 9' of the sewer invert 9.
  • the protrusions 7 are pressed into and enveloped by the adhesive 8, which may be a two part fast setting adhesive, for example.
  • the adhesive 8 is bonded to the surface 9' of the invert 9 and to the sealing region 130 of the duct 100.
  • the tabs 6a, 6b flex to conform to the shape of the surface 9' of the invert 9 and define the low flow channels 10a, 10b, arranged on either side of the body 102 of the bonded duct 100.
  • the inner sheath layer 2 which may comprise the corrugated metal sheath 4, is first wrapped around a micro-duct 1 or a micro-duct bundle.
  • the sheath layer may be formed having a substantially circular cross sectional shape.
  • the outer sheath 5 is subsequently formed over the inner sheath layer 2.
  • the outer sheath 5 may be coextruded over the inner sheath layer 2 to provide the tabs 6a, 6b and optionally, the mechanical key profile.
  • the tabs 6a, 6b may be extruded as illustrated in Figure 1 , such that they are initially tight to the body 102 of the duct 100 to facilitate coiling of long lengths of the duct 100 for storage and transportation.
  • the tabs 6a, 6b may be deformable or flexible to an extent that at least permits movement of the tabs 6a, 6b to a position suitable for engaging with the invert 9 of the non-man entry sewer pipe.
  • the tabs 6a, 6b may be extruded closer to their final form illustrated in Figure 2, with only minimal deformability or flexibility required to enable the tabs 6a, 6b to conform to a shape of the surface 9' of the invert 9.
  • the non-man entry sewer pipe 18 is first temporarily stoppered so that a section of the pipe can be isolated, for laying the duct 100 therein.
  • the surface 9' of the invert 9 may be roughened prior to installation of the duct 100.
  • the invert 9 may subsequently be cleaned using, for example, high pressure water jetting, to remove any silt, slime or tree roots that may be present on the invert 9.
  • the duct 100 is then pulled through an access point, such as a manhole 13, until it reaches an exit point, such as an exit manhole.
  • the duct 100 may be held in place by temporarily clamping the duct 100 at the access point 13. Alternatively or additionally, the duct 100 is temporarily fixed to the sewer 19 at an end 20 of the isolated section distal from the access point 13. Adhesive 8 is then injected between the surface 9' of the invert 9 and the duct 100. The adhesive 8 may be injected between the surface 9' of the invert 9 and the sealing region 130 of the duct 100. The adhesive 8 may be continuously dispensed along the invert 9.
  • the adhesive 8 may be intermittently dispensed along the length of the sealing region 130 of the duct 100 to form adhesive patches or spots.
  • the duct 100 may then be pressed into the invert 9 and the tabs 6a, 6b may be flexed against the invert 9 to define low flow channels 10a, 10b, respectively.
  • the adhesive 8 forms a chemical bond between the surface 9' of the invert 9 and the sealing region 130 of the duct 100.
  • a system may be supplied to a construction site, for example, on a mobile trailer 11.
  • the system comprises a storage tank for storing the adhesive 8, and optionally a heating means for thermally conditioning the adhesive 8 by warming the adhesive 8 in the storage tank prior to application, to reduce the viscosity of said adhesive 8.
  • the adhesive storage tank may comprise two separate chambers, on chamber for each component of the two part resin. Each of the separate chambers may be heatable by the optional heating means to thermally condition each of the two components of the two part adhesive prior to application of the same.
  • the system also comprises a hose 12 in fluid communication with the storage tank and windable about a ratatable drum.
  • the hose 12 may have a length of between 100 and 200 metres, for example.
  • the system also comprises a means for rotatably driving the drum to pull the hose 12 through the non-man entry sewer pipe 18 at a substantially constant speed and a pumping means for pumping heated adhesive 8 from the storage tank through the hose 12.
  • the hose 12 is pulled from the ratatable drum through the sewer pipe 18 to a start position at or substantially proximal to the distal end 20 of the temporarily isolated section of the sewer pipe 18.
  • the adhesive storage tank is optionally heated prior to deployment of the hose 12 to thermally condition the adhesive prior 8.
  • Adhesive is applied to the surface 9' of the invert 9 by pumping adhesive from the storage tank through the hose 12 whilst the drum is rotated at a substantially constant speed to draw the hose 12 back through the temporarily isolated section of sewer pie 18 from the distal end 20 towards the access manhole 13 at a substantially constant speed.
  • a guide tool 15 is provided to an end of the hose 12.
  • the guide tool 15 comprises an application head 16 for guiding the duct 100 into conformance with a shape of the sewer invert 9.
  • the application head 16 may additionally be arranged for forming or shaping the tabs 6a, 6b against the surface 9' of the invert 9, thereby forming the low flow channels 10a, 10b.
  • the adhesive 8 is injected between the surface 9' and the sealing region 130 of the duct 100.
  • the guide tool 15 is drawn from the distal end 20 through the non-man entry sewer pipe 18 with the hose 12 until the guide tool 15 arrives at the access point 13 adjacent to the machine 11.
  • the guide tool 15 may additionally comprise a static impingement mixer for combining two components of a two part resin into one mixture, thereby initiating a curing reaction, immediately prior to ejection of the combined two part resin mixture.
  • the resin mixture 8 then solidifies around the mechanical key features of the duct 100.
  • the trailer 1 1 To install duct 100 having a length greater than the length of the hose 12, of the system, the trailer 1 1 must repositioned and the installation process restarted from the previous finishing point until the full length of the duct 100 has been bonded to the invert 9 of the non-man entry sewer pipe 18.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Sewage (AREA)

Abstract

La présente invention concerne un conduit (100) destiné à être installé sur un radier (9) d'un tuyau d'égout non-visitable qui comprend un corps (102) ayant un conduit (1) à travers celui-ci et des première et seconde pattes flexibles (6a, 6b). Les première et seconde pattes flexibles (6a, 6b) sont disposées sur une surface externe (5) du corps (102) et flexibles par rapport à celle-ci. Les première et seconde pattes (6a, 6b) et une section de la surface externe du corps entre celles-ci délimitent une région d'étanchéité (130) permettant de sceller le conduit (100) sur le radier (9), la région d'étanchéité (130) comprenant un profil de clé mécanique (7). Lors de l'utilisation, des premier et second canaux d'écoulement (10a, 10b) sont délimités respectivement par les première et seconde pattes flexibles (6a, 6b).
PCT/GB2018/051431 2017-05-26 2018-05-25 Conduit et procédé d'installation WO2018215790A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1708489.8 2017-05-26
GB1708489.8A GB2555669B (en) 2017-05-26 2017-05-26 Duct and installation method

Publications (1)

Publication Number Publication Date
WO2018215790A1 true WO2018215790A1 (fr) 2018-11-29

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GB (1) GB2555669B (fr)
WO (1) WO2018215790A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB201712911D0 (en) 2017-08-11 2017-09-27 Nuron Ltd Containment systems

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29801425U1 (de) * 1998-01-29 1998-03-12 Alsthom Cge Alcatel Vorrichtung zur Fixierung eines Kabels
EP0992826A2 (fr) * 1998-10-09 2000-04-12 Siemens Aktiengesellschaft Câble ancrable pour installation dans un système de canaux ou tuyaux
US6845209B1 (en) * 1997-01-20 2005-01-18 Martin Hecht Fibre-optic cable network

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6845209B1 (en) * 1997-01-20 2005-01-18 Martin Hecht Fibre-optic cable network
DE29801425U1 (de) * 1998-01-29 1998-03-12 Alsthom Cge Alcatel Vorrichtung zur Fixierung eines Kabels
EP0992826A2 (fr) * 1998-10-09 2000-04-12 Siemens Aktiengesellschaft Câble ancrable pour installation dans un système de canaux ou tuyaux

Also Published As

Publication number Publication date
GB2555669B (en) 2019-01-16
GB2555669A (en) 2018-05-09
GB201708489D0 (en) 2017-07-12

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