US20050191133A1 - Micro trench duct placement - Google Patents
Micro trench duct placement Download PDFInfo
- Publication number
- US20050191133A1 US20050191133A1 US10/786,298 US78629804A US2005191133A1 US 20050191133 A1 US20050191133 A1 US 20050191133A1 US 78629804 A US78629804 A US 78629804A US 2005191133 A1 US2005191133 A1 US 2005191133A1
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- US
- United States
- Prior art keywords
- trench
- cable
- micro
- duct
- sealer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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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
- G02B6/504—Installation in solid material, e.g. underground
Definitions
- the present invention relates generally to outside utility cable placement techniques and, more particularly, to utility cable placement using micro trench ducts.
- a method of placing cable beneath a roadway includes cutting a trench in a surface of the roadway and placing a duct in the trench. The method further includes filling the trench with a sealer and placing cable within the duct.
- an assembly for carrying cable within a trench cut in concrete or asphalt includes a duct comprising a tubular material having a hollow inner diameter and an outer diameter that is approximately equal to a width of the trench.
- the assembly further includes cable placed within the hollow inner diameter of the duct.
- a method of placing cable within concrete or asphalt includes cutting a trench into the concrete or asphalt to a depth of 3.5 to 4.0 inches from a surface of the concrete or asphalt. The method further includes placing a tubular material having a hollow inner diameter within the trench and placing the cable within the tubular material.
- FIG. 1 illustrates a micro trench according to one aspect of the invention
- FIG. 2 is a flow chart that illustrates an exemplary process consistent with an aspect of the invention
- FIG. 3 illustrates an exemplary cutting of a ninety degree turn according to an aspect of the invention
- FIG. 4 illustrates an exemplary core bore according to an aspect of the invention
- FIG. 5 illustrates an exemplary micro trench entrance to a hand hole according to an aspect of the invention
- FIG. 6 illustrates an exemplary micro trench entrance to a manhole according to an aspect of the invention
- FIGS. 7A and 7B illustrate an exemplary micro trench entrance through a wall according to an aspect of the invention
- FIG. 8 illustrates an exemplary micro duct placement process according to an aspect of the invention
- FIG. 9 illustrates an exemplary process for placing a micro trench spacer according to an aspect of the invention.
- FIGS. 10A and 10B illustrate spacer and sand placement in the micro trench ninety-degree turn of FIG. 3 according to an aspect of the invention.
- FIG. 11 illustrates an exemplary process for placing a micro trench sealer according to an aspect of the invention.
- micro trenches may be cut approximately three to four inches into a roadway surface, and a micro duct that includes a high load rating material may be placed into the micro trench for carrying the subsurface utility cables.
- a spacer may be placed on top of the micro duct along the length of the micro trench to enhance structural rigidity and to protect the micro duct.
- a sealer may then be placed in the micro trench, over the micro duct and spacer, to fill up the trench made in the roadway surface.
- Subsurface utility cables may then be inserted in the micro duct subsequent to placement of the micro duct in the micro trench.
- Subsurface utility cables may, thus, be easily repaired after placement into the micro trench by pulling the cables out through the micro duct via, for example, a hand hole or a manhole.
- the micro duct and spacer may additionally protect the subsurface utility cables from environmental conditions and external events that may otherwise damage the utility cables.
- FIG. 1 illustrates a cross section of an exemplary micro trench 100 that may be constructed in accordance with exemplary processes consistent with the invention.
- Micro trench 100 may include a channel in a roadway surface 105 for receiving a micro duct 125 .
- micro trench 100 may be cut through roadway surface 105 to a depth of d 1 110 in roadway material 115 .
- Depth d 1 110 may range from about 3.5 to about 4.0 inches.
- d 1 may be 4.0 inches.
- micro trench 100 may be cut to a width w 120 through roadway surface 105 .
- Width w 120 may range from about 0.50 inches to about 0.55 inches.
- w 120 may be 0.5 inches.
- Roadway material 115 may include concrete or asphalt.
- Micro duct 125 may be placed in the bottom of micro trench 100 .
- Micro duct 125 may include a hollow tubular conduit for receiving cable 130 , such as, for example, any type of utility cable.
- micro duct 125 may be made of HDPE and may further be HD20 load rated.
- Micro duct 125 may include an inside diameter that ranges from about 0.35 inches to about 0.40 inches.
- Micro duct 125 may further include an outside diameter that ranges from about 0.475 inches to about 0.525 inches.
- micro duct 125 may include a 0.375 inch inside diameter and a 0.5 inch outside diameter.
- Cable 130 such as, for example, fiber optic cable, may be installed in micro duct 125 to run through the inside diameter of the duct. Cable 130 may also include any type of utility cable that may fit within the inner diameter of micro duct 125 .
- Spacer 135 may be placed in micro trench 100 .
- Spacer 135 may include a substantially solid tubular member that enhances structural rigidity and provides protection to cable 130 from, for example, moisture and other environmental conditions that exist on the roadway surface 105 .
- Spacer 135 may, for example, be made out of a material that is water impermeable and heat resistant to approximately 400 degrees Fahrenheit.
- spacer 135 may be placed on top of micro duct 125 at a depth d 2 135 below roadway surface 105 . Depth d 2 135 may be at least 2 inches, but not more than 3 inches.
- Spacer 135 may have a diameter that is approximately 25% larger than trench width w 120 to ensure a tight seal between micro duct 125 and side surfaces of micro trench 100 .
- spacer 135 may have a 5 ⁇ 8 inch diameter for a 1 ⁇ 2 inch trench.
- a sealer 140 may be placed in micro trench 100 .
- Sealer 140 may seal micro trench 100 to protect cable 130 from environmental conditions.
- Sealer 140 may include, for example, bitumen, though other sealing materials may be used.
- the thickness of sealer 140 may be between two and three inches, and should overlap the edge of micro trench 100 by about two inches (not shown).
- the total width of sealer 140 on the roadway surface 105 therefore, should be approximately 4.5 inches (assuming a trench width w 120 of 0.5 inches). Sealer 140 may protrude no more than 1 ⁇ 4 inch above the roadway surface 105 .
- FIG. 2 is a flowchart that illustrates an exemplary process, consistent with the present invention, for cutting a micro trench 100 .
- the exemplary process may begin with cleaning of the roadway surface 105 where the trench is to be cut [act 205 ].
- the roadway surface 105 may be cleaned, for example, with high-pressure water or air to remove debris from the roadway.
- a route for micro trench 100 may then be defined on the roadway surface 105 [act 210 ].
- Defining micro trench 100 may include, for example, marking the route for micro trench 100 with any appropriate marking technique or mechanism.
- Such techniques or mechanisms may include, for example, marking the route for micro trench 100 with a chalk line.
- Such techniques or mechanisms may further include, for example, using lasers, GPS, inertial navigation systems, etc. for locating and marking the route for micro trench 100 .
- a micro trench 100 may then be cut in the roadway material 115 along the defined trench route [act 215 ].
- standard 1 ⁇ 2 inch concrete saw blades turned so that the blade cuts backwards (i.e., upcuts), may be used to cut a micro trench 100 of width w 120 and depth d 1 110 .
- the cutting machine may be used without water (i.e., dry cut), with a dust collection and containment system attached to the back of the blade area to catch the debris and dust.
- micro trench 100 may be cut parallel or perpendicular to other pavement attributes (e.g., expansion joints, striping, etc.).
- the trench depth d 1 may be between 3.5 and 4 inches and should be inspected after cutting to ensure gradual transitions are maintained. Transitions in depth at the bottom of micro trench 100 should be smooth and may be achieved with a hand/cut-off saw.
- Trench width w 120 may be equal to the outer diameter of the micro duct 125 that is to be placed in micro trench 100 . For example, if micro duct 125 to be placed has an outside diameter of 0.5 inches, then width w 120 should be 0.5 inches.
- trench 100 may be cut to each running line, and then a forty-five degree angle may be cut between the two lines.
- a micro trench ninety-degree turn 300 is illustrated in FIG. 3 .
- a first saw cut 305 is made along the trench running line and a second saw cut 310 is made perpendicular to the first saw cut 305 .
- a forty-five degree saw cut 315 may then be made that over cuts each end of the first and second saw cuts 305 and 310 .
- areas 325 may be notched out to an approximate six-inch radius.
- the forty-five degree saw cut 315 may extend approximately one saw blade in length between the first and second saw cuts 305 and 310 .
- a core bore may be made through an external surface of the hand hole, manhole or building wall.
- a core bore 400 may be drilled through the concrete, rock or other material 405 that comprises the hand hole, manhole or building wall.
- core bore 400 may include an outer diameter of one inch.
- FIG. 5 illustrates a specific example of a core bore 400 entrance to a hand hole 505 through a side surface of hand hole 505 below an existing grade 510 .
- Micro duct 125 and cable 130 may run through core bore 400 entrance into hand hole 505 .
- FIG. 6 illustrates another specific example of a core bore 400 entrance to a manhole 605 through a surface of the manhole 605 below an existing grade 610 .
- Micro duct 125 and cable 130 may run into core bore 400 entrance into manhole 605 .
- FIGS. 7A and 7B illustrate another specific example of a core bore 400 entrance through a wall 705 below an existing grade 710 .
- Micro duct 125 and cable 130 may be run through core bore 400 entrance through wall 705 into, for example, the interior of a building.
- the trench may be cleaned [act 220 ].
- Micro trench 100 may be cleaned, for example, with a blower or compressed air to remove all dust and debris.
- FIG. 8 is a flowchart that illustrates an exemplary process, consistent with the present invention, for placing micro duct 125 in micro trench 100 .
- the exemplary micro duct placement process may begin with an inspection of micro trench 100 [act 805 ].
- Micro trench 100 may be inspected, for example, to ensure that the trench is free of debris. Dirt, debris and surface moisture should be removed from at least six inches on each side of micro trench 100 prior to placement of micro duct 100 .
- HD20 load rated micro duct 125 may be obtained [act 810 ] and inspected to ensure that it is the appropriate inside and outside diameter.
- Micro duct 125 may then be placed in the bottom of micro trench 100 uni-directionally (i.e., placed only in one direction along the trench) [act 815 ].
- Micro duct 125 usually should not be placed from two different directions (i.e., bi-directionally). Micro duct 125 may be placed at the bottom of micro trench 100 by pressing it into the trench using a steel wheel with sufficient weight to ensure that slack is removed and there is no space between the duct and the bottom of trench 100 . If the micro duct 125 that is used does not contain a locate wire, then a tracer wire may be installed for locate purposes [act 820 ]. The tracer wire may, for example, include a coated 14 gauge copper wire installed on top of micro duct 125 and under spacer 135 .
- micro duct 125 may be inserted through a core bore 400 that extends through an external surface of the hand hole, manhole or building wall.
- micro duct 125 may be inserted through a core bore 400 that extends through concrete, rock or other material 405 of the hand hole, manhole, or building wall.
- Grout 410 such as, for example, epoxy grout, may be used between micro duct 125 and core bore 400 to seal any gap that exists between core bore 400 and micro duct 125 .
- FIG. 5 illustrates a specific example of micro duct 125 inserted through a core bore 400 that extends through an external surface of a hand hole 505 .
- FIG. 6 illustrates another specific example of micro duct 125 inserted through a core bore 400 that extends through an external surface of a manhole 605 .
- FIGS. 7A and 7B further illustrate another example of micro duct 125 inserted through a core bore 400 that extends through a wall 705 , such as a building wall.
- the cable 130 within micro duct 125 may be inserted into a splice case 720 of a pull box 715 .
- FIG. 9 is a flowchart that illustrates an exemplary process, consistent with the present invention, for placing one or more spacers in micro trench 100 .
- the exemplary process may begin with the inspection of micro trench 100 [act 905 ].
- Micro trench 100 may be inspected, for example, to ensure that the trench is free of debris.
- An appropriate sized spacer 135 may then be obtained for placing in micro trench 100 [act 910 ].
- the diameter of spacer 135 may be 25% larger than the width w 120 of micro trench 100 to ensure a tight seal between micro duct 125 and sealer 140 .
- Spacer 135 may be placed on top of micro duct 125 uni-directionally (i.e., only in one direction in trench 100 ) [act 915 ]. Spacer 135 usually should not be placed from two different directions (i.e., bi-directionally) and normally should not be spliced to begin a new piece or to make a repair. Instead of splicing, adjacent spacers 135 may be overlaid by at least six inches. Spacer 135 may be placed on top of micro duct 125 by pressing spacer 135 into micro trench 100 using a steel wheel with sufficient weight to ensure that slack is removed and that there is no space between micro duct 125 and the bottom of spacer 135 .
- sand may be added to all areas in micro trench 100 where spacers 135 will not protect micro duct 125 from hot sealer 140 [act 920 ].
- the sand should be added such that its height is the same as the top of spacer 135 .
- the sand may be fine grade and dry.
- the micro trench 100 may be inspected [act 925 ]. Micro trench 100 may be inspected, for example, to ensure that the top of spacer 135 or sand, if any, is at depth d 2 below the roadway surface 105 . Depth d 2 may by at least 2 inches, but no more than 3 inches from the surface.
- FIGS. 10A and 10B illustrate the placement of spacers 135 within a micro trench undergoing a ninety-degree turn, as previously shown in FIG. 3 .
- a beginning 1005 of a first spacer A may be placed on top of micro duct 125 , within saw cut 305 , and further placed such that the end 1010 of the spacer A ends at one end of the forty-five degree saw cut 315 .
- a beginning 1015 of a second spacer B may be placed on top of micro duct 125 , within saw cut 310 , and further placed such that the end 1020 of the spacer B ends at another end of forty-five degree saw cut 315 .
- Spacers A and B may, thus, be double stacked 1025 over a portion of forty-five degree saw cut 315 . Subsequent to placement of spacers A and B, the void area 1030 ( FIG. 10B ) at the intersection of saw cut 305 and saw cut 315 , and the intersection of saw cut 310 and saw cut 315 , may be filled to the top level of the spacers with sand.
- FIG. 11 is a flowchart that illustrates an exemplary process, consistent with the present invention, for placing sealer in micro trench 100 subsequent to micro duct placement.
- the exemplary process may begin with obtaining sealer 140 that is to be placed in micro trench 100 [act 1105 ].
- Sealer 140 may include, for example, bitumen, though other sealing materials may be used.
- Seated 140 may be heated and then placed in micro trench 100 [act 1110 ].
- Heated sealer 140 may, for example, be placed in micro trench 100 over spacer 135 in multiple unidirectional passes.
- Heated sealer 140 may include, for example, a thickness of d 2 . In some implementations, thickness d 2 may range from about 2 inches to about 3 inches.
- a spacer or sand may be used to fill the additional void between the top of spacer 135 that is placed on top of micro duct 125 .
- Sealer 140 may be heated to a temperature of between 325 degrees Fahrenheit (F) to about 375 degrees F before placement in micro trench 100 .
- the final pass to place sealer 140 may be made after previously placed sealer has had time to cool and contract [act 1115 ] and may overlap the edge of micro trench 100 by approximately two inches.
- Sealer 140 may be placed to include no more than 1 ⁇ 4 inch of sealer above roadway surface 105 .
- the cable 130 may be placed in micro duct 125 [act 1120 ].
- a pulling method for example, may be used to pull cable 130 through micro duct 125 . Pulling tension, however, usually should not exceed 300 lbs., therefore, a 300 lb. break-away may be used. Cable blowing techniques may also be used to place cable in micro duct 125 .
- a technique may be employed that uses micro ducts that can be placed in micro trenches under roadway concrete or asphalt to carry subsurface utility cables.
- Micro trenches may be cut approximately three to four inches into the roadway surface and a micro duct that includes a high load rating material may be placed into the micro trench for carrying the subsurface utility cables.
- Subsurface utility cables may be inserted in the micro duct and may then be easily repaired by pulling the cables out through the micro duct via, for example, a hand hole or a manhole.
- the micro duct additionally protects the subsurface utility cables from environmental conditions and external events that may otherwise damage the utility cables.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/786,298 US20050191133A1 (en) | 2004-02-26 | 2004-02-26 | Micro trench duct placement |
EP05004059A EP1569021A1 (fr) | 2004-02-26 | 2005-02-24 | Micro tranchée pour l'emplacement de conduit pour câble à fibres optiques |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/786,298 US20050191133A1 (en) | 2004-02-26 | 2004-02-26 | Micro trench duct placement |
Publications (1)
Publication Number | Publication Date |
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US20050191133A1 true US20050191133A1 (en) | 2005-09-01 |
Family
ID=34750485
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/786,298 Abandoned US20050191133A1 (en) | 2004-02-26 | 2004-02-26 | Micro trench duct placement |
Country Status (2)
Country | Link |
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US (1) | US20050191133A1 (fr) |
EP (1) | EP1569021A1 (fr) |
Cited By (33)
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US9786997B2 (en) | 2013-08-01 | 2017-10-10 | Centurylink Intellectual Property Llc | Wireless access point in pedestal or hand hole |
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US10154325B2 (en) | 2014-02-12 | 2018-12-11 | Centurylink Intellectual Property Llc | Point-to-point fiber insertion |
US20190033550A1 (en) * | 2017-07-28 | 2019-01-31 | Traxyl, Inc. | Method and apparatus for deployment of a communication line onto a surface such as a roadway or pathway |
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US10851517B2 (en) * | 2016-10-18 | 2020-12-01 | Cciip Llc | Multifunctional reel carrier-vac-spoil material handling container and method of trenching and laying cable or duct |
US10919523B2 (en) | 2016-12-23 | 2021-02-16 | Centurylink Intellectual Property Llc | Smart vehicle apparatus, system, and method |
US11232203B2 (en) | 2016-08-02 | 2022-01-25 | Centurylink Intellectual Property Llc | System and method for implementing added services for OBD2 smart vehicle connection |
US11466428B1 (en) * | 2021-12-22 | 2022-10-11 | Cciip Llc | Microtrench plug and method for securing an optical fiber and/or microduct/innerduct in a microtrench |
US20230013367A1 (en) * | 2020-08-26 | 2023-01-19 | Cciip Llc | Laybox for microtenching and method of microtrenching using the laybox |
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