WO2023147041A1 - Élément d'étanchéité, système et procédé d'étanchéification d'une micro-tranchée - Google Patents

Élément d'étanchéité, système et procédé d'étanchéification d'une micro-tranchée Download PDF

Info

Publication number
WO2023147041A1
WO2023147041A1 PCT/US2023/011725 US2023011725W WO2023147041A1 WO 2023147041 A1 WO2023147041 A1 WO 2023147041A1 US 2023011725 W US2023011725 W US 2023011725W WO 2023147041 A1 WO2023147041 A1 WO 2023147041A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal member
seal
trench
foam
protrusions
Prior art date
Application number
PCT/US2023/011725
Other languages
English (en)
Inventor
Eric I. Devine
Bryan E. MCKINNEY
Shubham B. THAKARE
Gregory J. Spillane
Original Assignee
Gibraltar Industries
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 Gibraltar Industries filed Critical Gibraltar Industries
Publication of WO2023147041A1 publication Critical patent/WO2023147041A1/fr

Links

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
    • H02G9/00—Installations of electric cables or lines in or on the ground or water
    • H02G9/02—Installations of electric cables or lines in or on the ground or water laid directly in or on the ground, river-bed or sea-bottom; Coverings therefor, e.g. tile
    • H02G9/025—Coverings therefor, e.g. tile
    • 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
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/06—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for laying cables, e.g. laying apparatus on vehicle

Definitions

  • the present teachings relate to a system and method for sealing a micro trench in pavement and methods of installation thereof, that is able to protect and provide access to utilities therein.
  • Micro trenching is the process of cutting a small groove or small channel in pavement.
  • Micro trenching is a growing practice used to install utilities such as fiber optic cable networks or other broadband network lines in a variety of residential, commercial, and industrial settings.
  • the groove for micro-trenches are usually one quarter to several inches wide (typically no more than 1.00 to 2.00 inches, subject to a tolerance of 0.1-0.2 inches either way) and up to 12 inches or even 24 deep (with a minimum depth typically dictated by the size of the utility being installed and/or other conditions at the site, but typically at least about 1, 2, or 3 inches).
  • Micro trenching is a low-impact deployment methodology and can be utilized without damaging or disrupting existing infrastructure, especially in view of the fact that existing trenching machinery creates a trench that is at least 5-6 inches wide (with an even larger footprint during the trenching operation itself).
  • flowable fill may include hot applied rubberized sealants, cold asphalt material, or cementitious grouts (e.g., cement- based grout, bituminous sealer, etc.) placed directly on top of the buried utility (e.g., fiber optic cables, etc.).
  • cementitious grouts e.g., cement- based grout, bituminous sealer, etc.
  • the buried utility e.g., fiber optic cables, etc.
  • a common means of overcoming these challenges is to simply create a new trench, usually in or adjacent to the existing trench and install separate/new utilities (and possibly remove the older line), all of which requires additional materials and labor costs. Because of the precision required to avoid damaging adjacent pavement and/or utilities, servicing flowable filled trenches and micro trenches tends to be time-consuming and increases the risk for other complications.
  • FIG. 1A depicts a preformed sealant A that may be used in sealing expansion joints in concrete.
  • the preformed sealant A has been shown ineffective in micro-trenching and other applications outside of concrete, including asphalt. Moreover, such preformed sealants A have been shown to cause distress and distortion in the asphalt. In fact, the preformed sealants A not only cannot provide a proper seal in asphalt, but further, the preformed sealant A has been shown to cause “shoving” when used in asphalt, see FIG. IB. Shoving is the formation of ripples across asphalt, causing distortion and disruption of the surface.
  • Such ineffective and improper sealing, as by the preformed sealant A, is also likely to cause other types of distress, including rutting, depressions, cracking, upheaval, disintegration, and other failures or disruptions in the asphalt trench and surface. This is believed to be caused, in part, by the compressive strength of the preformed sealant A and the flexible nature of the asphalt. As compared to concrete, the horizontal shear strength of asphalt is significantly lower than that of concrete.
  • FIG. 1C shows a compression deflection curve for the preformed sealant A having a 13/16” width.
  • the preformed sealant A of this size would be used in expansion joints with an opening range of about 0.375” to 0.688,” which may generally correspond to the operating range of a micro trench cut at about !4” which is about 0.375” to 0.625.” While the preformed sealant A of this size may have expected to provide an adequate seal such micro trench opening, quantitative results confirm that the preformed sealant A is not effective for use in a material having different compressive qualities and horizontal strength of concrete, such as asphalt.
  • the compressive force (stored energy) of the preformed sealant A is at a maximum.
  • a joint opening of about 0.375” corresponds to about 0.437” compressive extension, or about 20 psi compressive stress.
  • asphalt may be softer and more flexible.
  • FIGs. 1A and IB are side and top views of a preformed sealant A of the prior art typically used in sealing expansion joints in concrete
  • FIG. 1C shows a compression deflection curve for the preformed sealant A
  • FIG. 2 is a side view of an embodiment of a sealant system or apparatus in accordance with various disclosed aspects
  • FIG. 3 is a side view of the embodiment of of FIG.2 positioned in a micro trench in accordance with various disclosed aspects
  • FIG. 4 is a top view of an embodiment of a sealant system or apparatus positioned in a micro trench in accordance with various disclosed aspects;
  • FIG. 5 illustrates method of installing an embodiment of a sealant system or apparatus positioned in a micro trench in accordance with various disclosed aspects;
  • FIG. 6 is a side view of another embodiment of a sealant system or apparatus in accordance with various disclosed aspects
  • FIG. 7 is a side view of another embodiment of a sealant system or apparatus positioned in a micro trench in accordance with various disclosed aspects
  • FIG. 8 is a compression deflection curve of a sealant system or apparatus in accordance with various disclosed aspects
  • FIG. 9 schematic view illustrating a testing core and the test fixture configured to determine compatibility of a sealant system or apparatus in a material in accordance with various disclosed aspects
  • FIG. 10 is a photograph of a trial installation of a sealant system or apparatus in a trench at a testing site in accordance with various disclosed aspects
  • FIG. 11 are force/deflection curves for core tests and core testing samples at 3.22 psi in accordance with various disclosed aspects
  • FIG. 12 are force/deflection curves for core tests and core testing samples at 9.4 psi in accordance with various disclosed aspects
  • FIG. 13 are force/deflection curves for core tests and core testing samples at 20 psi in accordance with various disclosed aspects
  • FIGs. 14A and 14B are photographs of a trial installation of a sealant system or apparatus in a trench at a testing site over time in accordance with various disclosed aspects
  • FIG. 15 is a side view of an alternative embodiment of a sealant system or apparatus in accordance with various disclosed aspects
  • FIG. 16 is a side view of the embodiment of FIG. 15 positioned in a micro trench in accordance with various disclosed aspects;
  • FIGS. 17A and 17B show, respectively speaking, a three dimensional, perspective view and a botom view of an installation machine in accordance with various disclosed aspects;
  • FIG. 18 is a schematic side view of a platform useful for simultaneously laying fiber, cable, or other spooled media within a trench, while also providing foam backfill and a sealant system in accordance with various disclosed aspects.
  • FIG. 19 is a side view illustration of a splice between seal members made according to certain aspects of the invention.
  • FIGs. 20A and 20B are schematic illustrations of cutting tools appropriate for use with the splicing operations according to certain aspects of the invention.
  • the words “example” and “exemplary” mean an instance, or illustration.
  • the words “example” or “exemplary” do not indicate a key or preferred aspect or embodiment.
  • the word “or” is intended to be inclusive rather an exclusive, unless context suggests otherwise.
  • the phrase “A employs B or C,” includes any inclusive permutation (e.g., A employs B; A employs C; or A employs both B and C).
  • the articles include any inclusive permutation (e.g., A employs B; A employs C; or A employs both B and C).
  • a spoolable, branched, and T-shaped seal member and a specially formulated open or closed cell, curable foam can be implemented as part of a micro trenching system. These components can be provided on a single, unitary trailer or vehicle, or they can be retrofitted with/into existing trenching equipment and operations.
  • the seal member itself may be removable and serviceable, while the installation of foam and/or the seal member results in a sealed micro trench that is water tight, comparatively resilient, and resistant to damage caused by heavy usage and/or environmental factors.
  • the seal member has suitable compressive strength to support the trench walls without damaging adjacent pavement (or other roadway/surface materials).
  • the construction of the seal member will accommodate expansion and contraction caused by changes in temperature (i.e. , the freeze/thaw cycle) and/or traffic load while remaining firmly locked into any reinstating material (when used), and it can be provided as a spooled material, which is ideally suited for existing installation machines and further enables the seal member to be dragged, dabbed, or otherwise exposed to an adhesive as it is laid down into the trench and/or in contact with the utility line(s).
  • the foam is provided as a two part liquid, making it ideal for storage in and in situ dispensing from tanks. After the parts are mixed, the resultant material can flow and expand around any objects positioned within the trench (e.g., the utility line(s), the seal member, etc.) and then cure into a closed or open cell solid material.
  • the trench e.g., the utility line(s), the seal member, etc.
  • the sealing system and method may accommodate multiple parallel and/or intersecting/perpendicular micro trenches within a given road, street or other pathway/surface, irrespective of whether provided through intersections of cross streets or at various junctions from a mainline in a street to an end user/property adjacent to that street.
  • the system is capable of withstanding vehicle and/or pedestrian travel, varying environmental conditions, and other wear and tear.
  • the disclosed micro trench seal may allow for removal, targeted replacement of the utility, and reuse, all while maintaining integrity of the original micro trench.
  • the system is also configured to operate continuously by relying upon specialized tooling that enables the splicing of seal members from separate spools without pausing operations (i.e., without stopping cutting, reinstating, or sealing of the micro trench).
  • the system includes a cutting tool with a blade that partially removes the top flange and/or central body from the trailing edge of a seal member wound onto a first spool and/or the leading edge of a seal member wound onto a second spool.
  • the cutting tool integrates or the system includes a separate holder that positions these leading and trailing edges, both for purposes of cutting and to allow a fastening implement to couple the leading and trailing edges together.
  • that fastening implement may deliver one or more metal (copper, steel, etc.) or sufficiently hardened plastic staple, joint, or clip so as to hold the two edges together, preferably through overlapping portions of the main body and/or the top flange.
  • seal member 1 has a core T-shape, with the stem or main body 4 defining a central structural axis.
  • a flat head or top flange 2 is positioned at the top end 12 of the body 4, while a plurality of appendages or protrusions 3 extend radially (perpendicular to or an angle) from central section 16 of the body 4.
  • an engagement feature 7 allows reinstating material, such as a foam, to flow and cure around the feature to keep the member 1 locked in place within the trench.
  • the feature may take the form of a solid triangular shape (Fig. 2), an inverted V-shape (Fig. 15), or other similar structures, provided that the radial extension of the feature 7 is smaller than the corresponding radial extension of the set of shortest protrusion 3 (usually, the bottom-most set of protrusions 6).
  • axial refers to the vertical direction of the member 1 as shown in the figures, while “radial” extensions will trace a generally horizontal direction although, unless otherwise stated herein, radial protrusions, extensions, and the like may be provided at a perpendicular or angled orientation relative to the central axis coinciding with the axial length of the main body 4.
  • references to “trench” and “micro trench” may be used synonymously, depending upon the specific context of their use.
  • the member 1 is illustrated in cross section, but it will be manufactured (e.g., by way of extrusion) continuous web so that it can be reeled around a spool or otherwise gathered for subsequent dispensing and use.
  • the cross sections shown in Figs. 2, 15, and elsewhere are part of a body that otherwise can run on for extended lengths (as would be expected and needed for the seal member to be unspooled and positioned into a micro trench).
  • the seal 1 may be inserted into a micro trench 200 in any suitable manner, including by inserting the second end 14 first with the protrusion(s) 3 extending into contact with walls of the micro trench as described in more detail below. More specifically, the micro trench may include sidewalls 204 and an opening 206. The seal 1 may engage a surface of the pavement 202 generally adjacent to the micro trench.
  • the seal 1 is ideally formed from an appropriate polymeric resin selected for the particular temperature and pressure conditions encountered in trenching operations.
  • the material can be a thermoset elastomer material.
  • the resin material can be a thermoplastic material.
  • the material may be a combination of the foregoing.
  • the material can be resistant to environmental conditions such as water, ozone, oxidation, and UV.
  • the shape of the seal 1 may be formed using an extrusion process and may be cured to achieve its final desired properties.
  • the seal 1 may be machine molded in a single continuous step so as to facilitate spooling.
  • the entire seal 1 may be formed from the same material or different portions of the seal 1 may be formed from different materials that are subsequently adhered, welded, or otherwise bonded together.
  • the protrusions 3 or the ends of the protrusions may be formed from a more flexible rubber material or the top flange 2 may be formed from harder materials able to withstand wear from environmental conditions and use.
  • suitable materials include, but are not limited to, rubber-like polymers including, polyisoprene, butadiene rubbers, styrene-butadiene copolymers, such as Buna S and SBR, cis -polybutadiene, cis -polyisoprene, nitrile elastomers or NBR rubbers (also known as acrylonitrile and butadiene copolymers) such as Buna N, butyl rubbers including copolymers of isobutylene and isoprene, ethylene-propylene monomer (EDM), ethylene-propylene-diene monomer (EPDM), neoprene (polychloroprene), polysulfide rubbers (thiokols), ethylenepropylene rubbers (RPDM), urethane elastomers, and silicone rubbers such as dimethysilanediol polymers and polydimethyl siloxane,
  • suitable materials may include, but are not limited to, plastics such as polycarbonate; acrylonitrile butadiene styrene (ABS); polycarbonate/acrylonitrile butadiene styrene alloys (PC-ABS); polybutylene terephthalate (PBT); polyethylene therephthalate (PET); polyphenylene oxide (PPO); polyphenylene sulfide (PPS); polyphenylene ether; modified polyphenylene ether containing polystyrene; liquid crystal polymers; polystyrene; styreneacrylonitrile copolymer; rubber-reinforced polystyrene; poly ether ketone (PEEK); acrylic resins such as polymers and copolymers of alkyl esters of acrylic and methacrylic acid styrenemethyl methacrylate copolymer; styrene-methyl methacrylate-butadiene copolymer; polymethyl meth
  • the stem 4 may include a first end 12, a second end 14, and a middle section 16 disposed between the first and second ends 12, 14.
  • the stem 4 may be inserted into the micro trench 200 such that most or all of the body 16 is generally below the surface of the pavement 210, see FIGs. 3 and 16.
  • the length of the stem 4 may be customized at the installation site once the dimensions of the micro trench 200 are confirmed, for example, by cutting off any access material or length. In such cases, the sets of protrustions provided closest to the bottom end 14 will have a shorter radial extension in comparison to the sets above it. In this manner, the cut can be made immediately adjacent to the bottom edge of a protrusion, thereby converting the lowermost protrusion into the engagement feature 7.
  • the stem 4 may be thick enough, such as one quarter to one eighth of the width of the top web, to maintain the center of the joint generally without twisting or buckling, creating a self-centering effect.
  • the first end 12 of the stem 4 may include the top flange 2 or the top flange 2 may be positioned thereon.
  • the top flange 2 may be removable from the stem 4.
  • the top flange 2 may be removed, and a different sealing mechanism or material used in conjunction with the stem 4.
  • the top flange 2 may also be removed from the stem 4 and replaced by another top flange 2, for example, if the top flange 2 becomes damaged during use.
  • the top flange 2 may also be removed and a coating of bituminous crack filler can be added to extend the life of the seal.
  • the top flange 2 may also be configured to become detached from the stem 4 upon certain threshold pressure or conditions so that the stem remains in the micro trench 200 in the event the top flange 2 is pulled, detached, dislocated, or otherwise removed unintentionally or intentionally.
  • the top flange 2 may be caught by a snow plow, street cleaner, truck, car, or the like. It may be desirable to have the top flange 2 selectively detached or be stripped off from the stem 4 under these conditions so that any damage is concentrated on the top flange 2 that can be replaced, rather than the stem 4 or the structure of the micro trench 200 and to prevent the entire seal 1 from inadvertently being removed from the micro trench.
  • the top flange 2 may include an elongated portion 22 that extends generally perpendicular (e.g., within 5 degrees of perpendicular) to the stem 4.
  • the top flange 2 may be planar, flat, domed, rounded, squared, or be formed as any other shape as may be desirable.
  • the elongated portion 22 may include a sufficient length to accommodate a large portion or length of the micro trench 200, for example several feet, see FIG. 4 for example.
  • several stems 4 may attach to the top flange 2 across its length to secure the seal 1 into the micro trench 200.
  • the elongated portion 22 of the top flange 2 may include a first face 24 and a second face 26, wherein the second face 26 may attach to or face the stem 4.
  • the top flange 2 may be removable from the stem 4.
  • the first face 24 may face outwardly from the micro trench 200, see FIGs. 3-4, as well as FIG. 16.
  • the top flange 2 may be of sufficient width to span the entire trench and lay generally flat on the pavement surface, see FIGs. 3 and 16, e.g., it may he such that only a centimeter or less is above or below the adjacent surface.
  • the top flange 2 may be larger than the micro trench 200 such that the top flange is not fully inserted into the micro trench 200.
  • the second face 26 of the top flange may include a notch 28 to fit on the edge of the micro trench 200 with the notch contacting a sidewall 204 of the micro trench 200 and the surface of the pavement 202.
  • the notch 28 may help to form a seal and may provide additional securement of the seal 1 within the micro trench 200.
  • the notch 28 may be sized for and be equal to the size of the micro trench opening.
  • the notch 28 may be formed in the seal 1 at manufacture, or the notch 28 may be added at the installation site once the dimensions of the micro trench 200 are confirmed.
  • the top flange 2 may generally be the same width as the micro trench 200, such that the top flange 2 may be inserted into the micro trench 200.
  • the top flange 2 may create a seal against the side walls 204 of the micro trench 200 (similar to the protrusions described below) and another seal material or mechanism may be placed on top, such as a fill material.
  • the top flange 2 may be any suitable shape including rectangular, circular, square, etc.
  • the top flange 2 may be any suitable shape so as to keep debris or water out of the micro trench opening 206.
  • the seal 1 may include at least one protrusion 3 extending from the body 16 or second end 14 of the stem 4.
  • the protrusion 3 may be formed as arms or wings that extend from opposite sides of the stem 4 in pairs to engage each of the corresponding side walls 204 of the micro trench 200.
  • the protrusion 3 is a continuous flange that may extend perpendicularly or generally perpendicularly (i.e., radially away) from the stem 4, e.g., at angles within about 15 degrees of perpendicular.
  • the protrusions 3 extend from the stem 4 at an angle toward the top flange 2, see FIG. 2.
  • the protrusion is of a sufficient length to maintain may contact the sidewall of the sidewalls 204 of the micro trench 200 with normal variation in temperature and expansion or contraction of the pavement.
  • the length of the protrusions 3 may be customized at the installation site once the dimensions of the micro trench 200 are confirmed, for example, by cutting off any access material or length.
  • asphalt or HMA may be particularly susceptible to variations in temperature and can result in changes in width of the micro trench 200.
  • the protrusions 3 may extend at approximately the same radial distance on either side of the stem, so as to allow easily centering the seal 1 within a microtrench 200. Additionally, as shown in FIG. 3, the protrusions 3 may have the same comparative radial distance, although it is preferably smaller than the distance spanned by the top flange 2. Alternatively, the protrusions 3 may be shorter in length in comparison to top flange 2 (as shown in FIG. 15) and/or in comparison to one another, so that the distal edges and radial distance of each flange gets progressively smaller as the protrusions progress from the first end 12 to the second end 14, as this arrangement allows for the seal 1 to interlock with a foam backfill material, as described below.
  • the protrusions 3 may be formed as pairs so that each pair is positioned at a different axial distance (relative to the top flange), or the protrusions may be axially offset from one another so that the protrusions extend away from the central body in an alternating fashion as they move down the central body.
  • the protrusions 3 and the top flange 2 are of sufficient strength so that when positioned as shown in FIGs. 3 and 16, any foam backfill material will be impeded from flowing around the distal edges of the protrusions 3. In this manner, the seal insures that foam cannot and will not expand upward out of the trench or to otherwise be visible when the installation is complete.
  • One or more sets of the protrusions 3 may include one or more hinge points 5 that allow the seal 1 to fold against the pavement or side walls 204 of the micro trench 200, increasing the sealing area, see FIGs. 3 and 16. Owing to the continuous web nature of the sealing member 1, hinge points 5 are formed as continuous grooves.
  • the top flange 2 may also include a hinge point 5.
  • bottom-most set of protrusions 6 inserted into the micro trench may not include a hinge point 5 while the remaining, higher sets of protrusions 3 may include a hinge point 5, see FIG. 3.
  • the bottom-most set of protrusions 6 not including the hinge point 5 may permit the seal to engage the micro-trench with more force than the other protrusions 6 with the hinge point 5 - this may prevent the seal 1 from being pulled out of the micro-trench.
  • Each protrusion 3 may operate independent of the others, creating a seal at each protrusion location that is custom to the shape and contours of the micro trench 200.
  • providing the additional sealing protrusions and hinges not only may better secure the seal 1 within the micro trench and create a seal at multiple locations, but can also provide continuous service even if the top flange 2 or a protrusion 2 is damaged or the pavement is compromised at one location.
  • when a force is applied to the top flange 2 it may shear before the entire seal 1 is removed from the micro trench.
  • the location of the hinge 5 may be designed specifically for the opening dimensions of the micro trench 200 to maximize sealing yet control the outward force that would disturb asphalt.
  • the hinge 5 may also ensure that less pressure is applied onto the side walls 204 of the micro trench where the asphalt in the micro trench may be the weakest.
  • the asphalt may be weaker toward the top of the opening of the micro trench.
  • the protrusions 3 inserted into this area of the micro trench may include a hinge 5 to reduce the force and prevent too much force to be applied from the protrusions 3 to the side walls 204.
  • the side walls 204 of the micro trench may be stronger further down into the micro trench.
  • the protrusions 6 inserted into this area of the micro trench may not include a hinge 5 because damage due to the force of the protrusions may not be as much of a concern and instead, it may be desirable to have a greater force and seal in this area of the micro trench to further secure the seal 1 into the micro trench.
  • the hinge 5 may be formed in the seal 1 at manufacture, or the hinge 5 may be added at the installation site once the dimensions of the micro trench 200 are confirmed.
  • the second end 14 will have a radial distance that does not exceed the reach of the top flange 2 and, more preferably smaller than the reach of the protrusion 3 immediate above and adjacent to it.
  • second end 14 may slope at an angle (in comparison to the generally perpendicular protrusions 3).
  • the end 14 may have a cross-sectional shape that is triangular (as seen in FIG. 3) or, by way of two angled legs, V-shaped (as seen in FIG. 15).
  • this embodiment describes protrusions 3 including a hinge point 5, it is noted that a micro trench seal 100 may also be provided without a hinge point, see FIGs.
  • the seal 100 may include a top flange 102, at least one protrusion 103, and a stem 104.
  • the incorporation of a hinge point may depend on the nature and integrity of the material forming and surrounding the micro trench, weather or environmental conditions, anticipated use of the road or pathway, material of the micro trench seal, and the like.
  • the shape of the protrusions 103 may be altered to create variable force on the micro trench walls.
  • the protrusions 103 may be made thinner or thicker, having a different circumference, of a material having a different flexibility, and the like.
  • the micro trench seal 100 and the seal 1 are exemplary embodiments.
  • the present disclosure contemplates seals of different configurations.
  • the features disclosed above regarding seal 1 may be combined with micro trench seal 100 and the features disclosed above regarding micro trench seal 100 may be combined with seal 1.
  • the seal 1 and micro trench seal 100 may be of different configurations without departing from the present teachings.
  • the seal 1 and/or micro trench seal 100 may be formed from the material described above, be serviceable and be of varying configurations that operatively fit within a micro trench as described above.
  • seal 1 is inserted in the top of the trench to confine the foam material within the trench.
  • the foam material is an elastomeric material that can be urethane or silicone, with either a closed cell or open cell (preferred for waterproofing the trench) form upon curing.
  • the foam material bonds to the trench walls and seal closing off the trench to water or incompressible materials to prevent spalling.
  • the interlocking arrangement of the seal 1 shown in FIGs. 15 and 16 improves the water tightness of the system and prevents the seal from being pulled from the trench.
  • Appropriate foam backfill materials are preferably elastomeric foams based on urethane and/or silicone polymer, provided as a single or plural component system.
  • the foam should have a cream time in the range of 1-30 seconds, a gel time in the range of 2-60 seconds, and a tack free time in the range of 3-120 seconds. Once cured it has a core density of 0.5 - 60 pounds per cubic foot and a compressive strength of 2-200 psi.
  • the foam could be hydrophobic to allow it to fully cure in hydrostatic conditions, allowing for installations in damp conditions.
  • Typical geotechnical foam literature provided for Penefil 375.
  • the foam should be capable of bonding to the pavement and the elastomeric sealing element. Also, the foam may be supplied in small hand mixed batches or bulk kits to allow pumping into the installation/trench.
  • the seal member may be coated, dragged through, or otherwise come into contact with a curable adhesive.
  • This adhesive would bond the seal member to the utility line(s) and/or the trench walls, so as to maintain the desired positioning of the seal member throughout the trenching and reinstating procedures.
  • the adhesive may be any common adhesively, preferably water based or a two-part system.
  • Pumping and injection systems should be electronically controlled to mix and place the appropriate volume of material in the trench based on the trench dimensions and the rate of travel to ensure a continuous process.
  • the pump should include a spray head that applies the foam to the sidewalls of the trench to ensure full coverage of the trench walls.
  • the head should be aligned with the trench such that the foam is applied so that the foam coats the trench walls and embeds itself in the seal.
  • the pump should have the capability to heat the foam material to provide for a consistent cure rate and foam time.
  • the pump should also include an air purge for when work stoppages occur.
  • FIG. 5 shown is a method 300 of installing a seal 1.
  • a micro trench is formed by excavating material such as pavement and dirt, to a desired width and depth as is necessary for the particular utility being installed.
  • the dimensions of a micro trench may range from 12 inches in depth, 0.5 inches in width, and 5,000 foot length - although these are merely exemplary any the micro trench may be of any appropriate dimension.
  • a utility may be installed.
  • the utility may include broadband network access such as fiber optic lines.
  • the seal 1 may be inserted into the micro trench 200. The installation of the seal may occur concurrently with the installation of the utility. The installation of the seal 1 may be done by hand by pressing the seal 1 into the opening 206 of the micro trench 200 or by machine.
  • the structure of the seal 1 may enable installation of the seal 1 by hand where otherwise a machine would usually be needed.
  • the seal 1 may provide improved on site installation capabilities and may minimize the need for additional machinery to facilitate installation of the seal 1.
  • this step 3006 coupling or splicing trailing and leading edges of separate sections of seal members is possible.
  • an adhesive may be used to facilitate the installation of the seal 1 into the micro trench.
  • the adhesive may be spray on, paint on, stick on, or the like.
  • a machine may be used to control the volume of an adhesive, such as a spray on adhesive, applied during installation.
  • the seal 1 may be customized at the installation site by adjusting the length of the stem 4, the protrusions 3, the notch 28, and the hinges 5. For example, excess length of the stem 4 or protrusions 3 may be cut or material removed to form the notch 28 or hinges 5.
  • the seal 1 should be inserted to a depth that allows the top flange 2 to remain flush with the surface of the pavement 202.
  • the seal 1 can be installed with or without adhesive.
  • the adhesive should have a high enough viscosity to have a lubricating effect and a long enough open time to allow for adjustment of seal depth. If the micro trench 200 is cut excessively deep it may be desirable to partially fill the trench with dry fill material such as sand or spoils left over from when the trench was cut.
  • Another aspect of the invention relates to equipment that enables the continuous dispensing and positioning of the seal member. That is, the seal member is easily transported by winding it around a spool, but spools (and other similar storage means) can only hold a finite length of the seal member.
  • the system can be configured to include multiple spools and to splice the edges of seal members from separate spools, by way of a cutting tool and a fastener.
  • a mobile platform outfitted with ten full reels positioned adjacent to one another will effectively enable installation of up to one mile of sealed micro trench.
  • the ability to install greater length of trench without stopping is particularly beneficial to the extent that other aspects of the invention (e.g., the shape of the seal and/or the use of foam/adhesive) already increase the speed of micro trench operations.
  • the mobile platform might include one or more bars or a T-shaped hanging rods that allows spools to be loaded and removed from one or both ends of the bar/rod.
  • the spools could each be associated with a movable stand or base. In either instance, a plurality of filled spools are readily accessible or in close proximity so as to minimize the amount of slack that must be created during the splicing operations described below.
  • the cutting tool can come in any number of arrangements. Critically, it will include a positioning member, such as a longitudinal channel and/or guide members, into which the leading and trailing edges of seal members from different spools are provided (with respect to the trailing edge, an operator will need to monitor progress and proactively couple these edges before they are placed into the trench, possibly with the further need to release the trailing edge from its spool). As implied by the name, the cutting tool also has a blade or implement to facilitate removing a portion of the seal member from one or both edges, ideally by way of cutting axially or radially into that seal member.
  • a positioning member such as a longitudinal channel and/or guide members
  • This cut allows for positioning of the edges in order to fasten them with the fastening implement, while simultaneously retaining the apparent continuity of the top facing of the top flange (for cosmetic purposes).
  • These positioning and cutting functions can be integrated within a single tool, or they can be provided as separate features of the system.
  • the fastening implement couples the trailing and leading edges together in a fast and cost efficient manner. It should be portable, easy to use, and avoid the need to cure or otherwise take time to effect a connection over a period time that might otherwise slow or disrupt installing of the sealing members. In these regards, the inventors have identified conventional industrial staples as an ideal solution.
  • Staples are attractive in part because of their ubiquitous nature. Further, they immediately couple members by having their opposing terminal edges of the staple penetrate the seal member, after which the staple edges are crimped inward so as to hole the staple securely in place. Simple U-shaped members made of copper, steel, other metals, sturdy plastics, or any other material that is sufficiently strong enough to pierce the material selected for the seal member and to withstand crimping. Other possibilities include clips, which rely on a biasing member to hold the edges together, and/or double-ended receiving joints where the edges can be slid into and/or secured to opposing sides of the joint member.
  • the fastening implement can be a stand alone feature, such as a hand held stapler so as to provide the operator with greater freedom to manipulate and position the necessary components.
  • the stapling mechanism could be integrated within a portion of the cutting tool so as to guarantee consistent and proper positioning of the trailing and leading edges throughout the splicing operation (i.e., positioning the separate edges, cutting/removing a portion of one of the edges, and coupling the edges via the fastener/fastening implement).
  • the cutting tool can be any number of implements, from a hand held device up to an integrated workstation on a mobile platform. In operation, it includes a positioning and/or securing mechanism, such as a slot, spring-loaded grippers, or the like.
  • a blade or cutting surface can move across one edge of the securing mechanism so as to create a clean and angled or shaped cut through a portion of the seal member.
  • the use of an angled cut (e.g., as seen along the leading edge 31b in Fig. 19) insures that the edges do not have to be perfectly aligned prior to fastening.
  • a second positioning and/or securing mechanism can be provided and spaced apart from the first so as to allow both the lead and trailing edges to be held independently.
  • the tool can also include flanges (e.g., horizontal members on one or both transverse edges of the securing mechanism). These flanges may allow for holding and positioning the tool, and/or they may serve as means to attach or fasten the tool in place on a mobile platform, preferably adjacent to the spools carrying the seal members. Alternatively, the tool could be two or four blocks spaced apart to define a channel, with a guillotine-style cutting implement also provided.
  • flanges e.g., horizontal members on one or both transverse edges of the securing mechanism. These flanges may allow for holding and positioning the tool, and/or they may serve as means to attach or fasten the tool in place on a mobile platform, preferably adjacent to the spools carrying the seal members.
  • the tool could be two or four blocks spaced apart to define a channel, with a guillotine-style cutting implement also provided.
  • the seal 1 or the top flange 2 may be removed as necessary.
  • the components may be removed to allow access to the utility in order to fix or replace the utility, or the components may be removed and replaced if due to damage or wear and tear, as for example, by a snow plow.
  • the seal 1 is able to allow continued access to the utility through its duration of use while both maintaining its integrity within the micro trench and adapting to the changing conditions of the micro trench due to various environmental conditions such as varying temperature.
  • step 3008 is optional; however, when it is employed, the seal that was removed may be reused or repurposed to reseal the micro trench according to at least some subset of the previously mentioned steps 3002, 3004, 3006.
  • FIG. 8 shows a compression deflection curve for the seal 1 (this is a result from a test to measure the force to compress an objection, such as through ASTM D575).
  • the maximum force is only 3.22 psi.
  • seal 1 is a low force seal that may provide an effective seal in materials that have different compressive qualities and horizontal strength than that of concrete, such as asphalt.
  • seal 1 may provide an effective seal in such materials, may not disrupt the structure of the materials in the walls of the trench or surrounding surface (e.g. prevent shoving, rutting, depressions, cracking, upheaval, disintegration, and other failures or distress), and may allow access to the underlying utilities after installation.
  • the seal 1 may also provide a cost effective and low profile solution, minimizing the time, expense, resources, and obstruction to the road or walkway during and after installation.
  • a Marshall test may be used as a quality control tool for evaluating asphalt mixtures.
  • Marshall stability and flow may also be used to relatively evaluate different mixes and the effects of conditioning.
  • the resistance to plastic deformation of a compacted cylindrical specimen of a bituminous mixture is measured when the specimen is loaded at a deformation rate of 50 mm per minute.
  • the current method is only suitable for testing asphalt mixes rather than a sample of asphalt or asphalt that has already been in place.
  • the results disclosed herein indicate that a modified Marshall test could be used to determine if asphalt or pavement that is already in place may be suitable for use with a particular sealant.
  • the modified Marshall test may comprise making cut made through the core to represent the trench sidewall as noted in more detail below.
  • testing cores 200 were taken and formed from asphalt testing sites at various locations as described herein.
  • a testing core 200 having a diameter of 6 inches sample was used as it is large enough to measure force distribution, but not too large to make testing cumbersome.
  • a fresh cut through the testing core 200 was carried out to determine and evaluate properties.
  • a cut in the testing core 200 was made at the diameter of the testing core 200 to ensure adequate material was left for testing and to eliminate any comer effects.
  • the testing core 200 was constrained in an epoxy form 210 to provide proper support of the testing core 200 when force 220 is applied.
  • a force 220 of 3.22 psi was used based on the corresponding deflection curve, see FIG. 8.
  • the epoxy form 210 also represented an infinite plane of asphalt.
  • a bar 230 was used to transfer the load 220.
  • the bar 230 had 1 inch by 1 inch dimensions with an area of 4.988 in 2 .
  • This area represented the height of the seal 1 that may be in contact with the trench or asphalt surface when installed.
  • the testing cores 200 were cut to a 2 inch depth.
  • the bar 230 was aligned with the top edge 205 of the testing core 200 to simulate sealing the top of the trench. Testing was performed on an Instron 3366 test frame with an environmental chamber installed for testing at elevated temperatures. For elevated temperature testing the samples were conditioned in a Tenny environmental chamber for 24 hours at 140°F and 80% RH.
  • Test sites were selected to ensure a relatively good sampling of materials. Test sites varied from extreme heat and sun to cold and wet climates, and pavement condition varied from new to old and worn. At six test sites, two trenches were cut having a 25 foot length and 1-2 testing core 200 samples taken. At one test site, a single trench having a 45 foot length was cut and no testing cores 200 were able to be taken due to the location being a city street. Testing cores 200 were taken with a diamond hole saw. Trenching was performed using a Ditch Witch MT9 trenching saw mounted on an SKI 050 Mini Skid Steer. A half inch saw blade was used.
  • Trenches were cut 3-5 feet apart with a target trench dimension of 0.625 inches and 4-5 inches in depth. The trenches were then backfilled with sand to create a seal reservoir that was 1.5 inches deep. Seal 1 was installed at each location.
  • FIG. 10 shows an exemplary installation in a trench in Sacramento, CA. These locations, the age and condition of the pavement, the sample date, and notes are shown below in Table 1. Trenches were monitored for 6 weeks for shoving, cracking, or other distress in the asphalt.
  • FIG. 11 shows the force and the deflection curves for a set of testing core 200 samples in Cincinnati, OH.
  • Table 2 shows the deflections of pavements at the different temperatures and a comparison of the results thereof. The increasing slope of the curve in FIG. 11 indicates an increased resistance to movement, i.e. minimal deflection. A comparison of the deflections in Table 2 further confirms that there is no evidence of shoving at the 3.2 psi loading. Differences in deflection ranged from 0-0.003 inches.
  • FIGs. 14A-B show the trenches performed in Manhattan, KS when the seal 1 was first applied (FIG. 14A) and after 8 weeks (FIG. 14B).
  • both the core testing and trial installations show compatibility of the seal 1 in various compositions, types, and ages of asphalts and pavements that are subject to varying environmental conditions.
  • Seal 1 under both core testing and trial installations, did not show shoving or other distress to the asphalt or pavement.
  • the results indicate that the modified Marshall test as created and used herein, can be used to determine if an asphalt or pavement is compatible or incompatible with a sealant, including seal 1 (and preformed sealant A showing incompatibility). Test results showing no sign of shoving can indicate good trench performance after the sealant is installed.
  • the modified Marshall test can also be used to determine the maximum force allowed before pavement failure or, in other words, the amount of force that will induce shoving in the asphalt or pavement once a sealant is installed.
  • An installation machine and/or platform is contemplated to align the seal with the trench.
  • This machine, platform or system can include a mechanism for compressing the seal so that it can be installed in the trench, a discharge blade that installs the seal, and a compaction wheel that ensures that the seal top flange is in intimate contact with the pavement surface.
  • the installation machine includes a carriage for holding reels of seal that can be from 50 feet to
  • the apparatus 50 for installing the seal should include a guide mechanism 51 for aligning the seal with the trench opening in the proper orientation. Wheels or other mechanisms 53 compress the seal while discharge blade 54 places the seal in the trench opening. Final level of the seal in the trench is accomplished by a compaction wheel 55.
  • the machine should include a locating device 52 to keep itself centered in the trench opening.
  • Foam pumps 62 may be interposed between these items, although a plurality of pumps could be provided before, in parallel with, or after (as shown in FIG. 18) the fiber/utility dispenser 61. Ultimately, the positioning and arrangement of pump(s) 62 should be made with an eye toward maximizing the speed at which foam is deposited and cures within the trench. Consideration as to the source of the foam (i.e., bulk kit, continuous addition, hand mixing, etc.) also influences the plumbing arrangement for platform 60.
  • Fig. 19 shows orientation of trailing edge 31a and leading edge 31b relative to the direction F of installation/unwinding (e.g., during the operation of system 50).
  • a diagonal cut is made through the top flange of the lead edge 31b, although s similar operation can be performed on the trailing edge 31a.
  • Staple 35 is installed through portions of each edge 31a, 31b, with the understanding that the terminal edges (not visible) of the staple 35 are bent or crimped by the fastening implement to insure that the staple 35 is held in place within each member associated with edges 31a, 31b. In this manner, the separate seal members are coupled and move in concert along the line of installation F.
  • FIGs. 20A and 20B show exemplary schematics for embodiments of the cutting tool (Fig. 20A) and how it might be implemented on a mobile platform (Fig. 20B).
  • Handheld or freely manipulated tool 300 defines a channel or secure gripping slot 302 with flanges 304 on either side.
  • a cutting blade 306 is affixed to one edge.
  • a platform based tool 310 includes spaced apart blocks 314 defining the slot 312, with a blade 316 positioned proximately.
  • Tool 310 is carried on a mobile platform 320 fitted with a T-shaped spool carrier 322.
  • one aspect of the invention relates to a seal member for a micro trench.
  • the seal member may be formed as a continuous web and positioned around a spool or reel.
  • the seal member includes a top flange, a central body extending orthogonally down from a middle portion on an underside of the top flange, a plurality of protrusions extending radially away from the central body, and an engagement feature positioned at a lower terminal end of the central body. Additional aspects may include any one or combination of the following features:
  • the engagement feature has a triangular or V-shaped cross sectional profile; • wherein the top flange includes a central hinging groove formed on a top facing;
  • the plurality of protrusions include one or more pairs positioned at an identical axial height on opposite facings of the central body;
  • pairs of protrusions each have a different radial extension, with a shortest radially extending pair positioned immediately next to the engagement feature;
  • pairs of protrusions have progressively shorter radial extensions so that a longest radially extending pair is positioned immediately next to the top flange and the shortest radially extending pair is positioned immediately next to the engagement feature;
  • a further aspect relates to a system for sealing a micro trench.
  • This system includes all of the various aspects of the seal member identified in the previous paragraph, along with at least one selected from: i) an adhesive applied to a portion of the seal member, and ii) a curing foam used as a reinstating material.
  • This system may also be provided on a mobile platform that is configured to transport and dispense the seal member and the foam/the adhesive. When the mobile platform is used, it may also have a guide mechanism, a discharge blade, a compaction wheel, and/or a plurality of storage tanks configured to mix a curing agent with the foam and/or the adhesive as it is dispensed.
  • the system and mobile platform can both incorporate, either as a standalone member or as part of the guide mechanism or discharge blade, a cutting tool and fastening implement, wherein the fastening implement delivers a staple through the seal members.
  • a cutting tool and fastening implement delivers a staple through the seal members.
  • the fastening implement delivers a staple through the seal members.
  • Any of these aspects of the system might also include one or a combination of the following: • wherein the foam is an elastomer configured to: i) flow around the seal member prior to curing and ii) adhere to the sealing member and any adjacent surface during and after curing;
  • foam includes urethane and/or silicone
  • the foam has a cream time of 1-30 seconds, a gel time of 2-60 seconds, and a tack free time 3-120 seconds;
  • the foam when cured, has a core density of 0.5 - 60 pounds per cubic foot and a compressive strength of 2-200 psi.
  • a method for sealing and/or reinstating a micro trench includes forming a micro trench in a hardened surface at a first rate of speed and positioning a sealing member having any of the characteristics identified above to seal the hardened surface at a second rate of speed and wherein the second rate of speed is equal to or faster than the first rate of speed. Additional steps for this method might include: i) coating the seal member with an adhesive as the seal member is positioned within the trench and/or ii) providing an curable foam (having any of the qualities mentioned above) into the micro trench simultaneous to or immediately after the seal member has been positioned in the micro trench.
  • the additional step of mixing the foam composition with a curing agent as the foam is provided into the micro trench is a still further aspect of the method.
  • the method might also involve providing the seal member by winding elongated strips of the seal member onto a plurality of spools so that a first spool feeds the seal member into the micro trench and, prior to the seal member being completely unwound from the first spool, splicing a trailing edge of the seal member from the first spool with a leading edge of the seal member wound on the second spool.
  • the use of foam allows for the trench backfill operation to proceed at the same rate as the initial cutting of the trench.
  • conventional systems employing cementitious grout, sand, asphaltic material, or elastomeric patching (or some combination of these materials), result in a reinstatement rate of eight feet per minute.
  • conventional cutting saws used to form microtrenches may proceed at twenty five feet per minute or higher.
  • various disclosed aspects of the invention identified herein improves significantly upon previously known rates of reinstatement.
  • the structures and methods contemplated herein enable the rate of reinstatement to match the rate of conventional cutting saws, thereby leading to faster installation, reduced traffic impairment, and reduced overall costs in comparison to the conventional reinstatement methods noted above.

Landscapes

  • Road Paving Structures (AREA)

Abstract

L'invention concerne un élément d'étanchéité qui a une forme de T avec des saillies radiales configurées pour se loger à l'intérieur d'une micro-tranchée pour former un joint étanche à l'eau, résistant aux dommages. Selon certains aspects, le joint d'étanchéité peut être retiré pour permettre un accès ultérieur à des utilitaires installés à l'intérieur de celui-ci. Le joint d'étanchéité a une résistance à la compression appropriée pour supporter les parois de tranchée sans endommager la chaussée et s'adapte à l'expansion et à la contraction de la micro-tranchée et de la chaussée provoquées par des changements de température. Des systèmes et des procédés impliquant l'élément d'étanchéité sont également divulgués.
PCT/US2023/011725 2022-01-28 2023-01-27 Élément d'étanchéité, système et procédé d'étanchéification d'une micro-tranchée WO2023147041A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263304013P 2022-01-28 2022-01-28
US63/304,013 2022-01-28

Publications (1)

Publication Number Publication Date
WO2023147041A1 true WO2023147041A1 (fr) 2023-08-03

Family

ID=87472605

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2023/011725 WO2023147041A1 (fr) 2022-01-28 2023-01-27 Élément d'étanchéité, système et procédé d'étanchéification d'une micro-tranchée

Country Status (1)

Country Link
WO (1) WO2023147041A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160272774A1 (en) * 2015-03-18 2016-09-22 Johns Manville Open and closed cell polyurea foams
US20160376767A1 (en) * 2015-06-24 2016-12-29 Certusview Technologies, Llc Methods, systems, and apparatuses for variable-depth microtrenching
US20180196216A1 (en) * 2017-01-10 2018-07-12 Centurylink Intellectual Property Llc Apical Conduit Method and System
US20200227904A1 (en) * 2017-10-03 2020-07-16 Corning Research & Development Corporation Distribution cabling tape, system and tape application device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160272774A1 (en) * 2015-03-18 2016-09-22 Johns Manville Open and closed cell polyurea foams
US20160376767A1 (en) * 2015-06-24 2016-12-29 Certusview Technologies, Llc Methods, systems, and apparatuses for variable-depth microtrenching
US20180196216A1 (en) * 2017-01-10 2018-07-12 Centurylink Intellectual Property Llc Apical Conduit Method and System
US20200227904A1 (en) * 2017-10-03 2020-07-16 Corning Research & Development Corporation Distribution cabling tape, system and tape application device

Similar Documents

Publication Publication Date Title
CA3158852C (fr) Dispositif pour la reintegration d'une microtranchee
US9816236B2 (en) Device for reinstatement of a micro-trench
EP1191164A1 (fr) Structure de connexion de fils d'acier multibrin pour circuit imprime et procede de production de cette structure
US5928447A (en) Conduit repair and interior reconstruction
KR200398755Y1 (ko) 암거 지지구조
JP2015502466A (ja) 土木構造物に組み込むために複合材料から作製される製品
US20130121763A1 (en) Manhole, roadway and walkway repair
WO2023147041A1 (fr) Élément d'étanchéité, système et procédé d'étanchéification d'une micro-tranchée
KR20100123192A (ko) 신축이음 조성물, 신축이음 조성물 제조방법, 탄성 폴리머를 이용한 신축이음 및 그 시공방법
KR101046307B1 (ko) 교량 및 지하차도의 신축이음장치
JP2017166120A (ja) 水路構造物の補修方法及び補修水路構造物
JP4971232B2 (ja) マンホール補修方法
JP4502901B2 (ja) 更生パネル部材および劣化した構造物の壁面の更生方法
JP2016132867A (ja) トンネル覆工構造体
JP2009203703A (ja) 舗装材の補修工法
EP3922771A1 (fr) Route pavée préfabriquée multicouche
KR101990702B1 (ko) 방수시트를 이용한 방수공법
CN207332901U (zh) 一种新型的隧道衬砌台车台阶式堵头
KR100751894B1 (ko) 개질아스팔트층을 갖는 하수관로 보수재
KR100897688B1 (ko) 표층패널을 이용한 아스팔트 포장도로의 시공방법
KR100820331B1 (ko) 맨홀 보수공법 및 그 맨홀 보수부재
JP3385239B2 (ja) コンクリート構造物の接合部材
JP4399793B2 (ja) 止水機能付き目地板
CN211006685U (zh) 一种基坑支护结构
JP5666258B2 (ja) 舗装用コンクリート版

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23747642

Country of ref document: EP

Kind code of ref document: A1