The present disclosure relates to an apparatus and method for deploying a tubular body onto a surface such as a roadway or pathway. The disclosure also relates to a deployment system. The tubular body may be a communication line, such as a fiber optic cable.
Communication lines or communication cables (i.e., examples of tubular bodies) provide useful conduits to transfer information (e.g., audio, visual, etc.) using modern technology. An example of a communication line is a fiber optic cable. The deployment and installation of communication lines, however, can be challenging for several reasons. For example, communication lines may need to extend over relatively long distances to, e.g., provide a telecommunications to a commercial or residential building. Additionally, the communication lines may need to be accessible (e.g., for maintenance or repairs). At the same time, however, the communication lines may need to be protected from the environment and are often preferred to be hidden from view.
The usual process for installing a communication cable over a relatively long distance often consists of extruding plastic core tubes around fibers, helically wrapping the tubes around a central strength member, building up several layers of protective sheathing, surrounding the sheathing with a protective material (armor) such as steel, and surrounding the armor with a heavy polymer jacket. Once a cable is manufactured, it can be pulled through conduits, hung along telephone poles, and/or buried inside trenches. Additional possibilities include what is known as “micro-trenching” (see e.g., International Patent Application Publication No. 09/935,346), where an extremely small trench is cut into the road surface or the ground. The cable is then installed within the micro-trench or installed on a roadway in the layers of protective sheathing as described above. Another example is described in U.S. Patent Application Publication No. 2002/0038716 where a flat fiber conduit is used for further protection.
The use of armor and other materials increases the weight, fabrication cost, and installation foot-print of the fiber cable. The larger installation footprint often requires the significant disruption and repair of the installed route, all of which contributes to higher installation cost.
When installing below the surface, fiber cables can either be directly buried or installed into a conduit to further protect the cable. As noted above, the cable and conduit are often installed by trenching into the ground. The use of the conduit requires the added cost and overhead of conduit installation along with the fiber cable manufacturing and installation. Additionally, cutting the micro-trench adds expense and time to the installation process.
Aerial installations are performed by draping communication cables on communication or power distribution poles. Although this can provide for a quicker install than trenching or micro-trenching, this installation method introduces several downsides. Even if the power distribution poles are properly located, the poles could already be holding the maximum weight allowed, rendering them useless for expansion. Additionally, trees, buildings, personal property, and other utilities often interfere with the installation of new poles or cables. Installers are endangered by the height at which they must work and the often dangerous voltages in their work area. Overhead installations may be affected by unavoidable weather conditions, such as ice storms or thunderstorms. These environmental conditions often damage overhead installations for extended periods of time and require expensive repairs (also, e.g., owners of utility or power distribution poles may require a per pole recurring rental fee). Additionally, aerial installations are not aesthetically pleasing, compared to lower-visibility installation techniques.
Plowing, direct burial, or other similar cable installation methods often require an array of machines. For example, a machine that utilizes a cutting blade to trench through soil or other natural ground substances may be needed. The communication cable may be installed in a process described in French Patent No. 2,762,155, which involves: (i) cutting a trench, (ii) burying a cable in the trench; and then (iii) backfilling the trench with a filler material suitable for the ground surface. This installation technique may cause significant disruption to local roadway infrastructure with attendant business impacts and transportation delays.
Installing a communication cable by micro-trenching is similar to a trenching or plowing install, but the cutting tool and ground opening are smaller. Less filler material may also be required. The micro-trenching installation technique is mainly used on roadways and often utilizes a heavy duty diamond saw blade that cuts a narrow (e.g., only a few inches wide) section of a roadway or similar surface to a predetermined depth depending on the location. A communication cable is installed or micro duct is inserted for later filling with a communication cable. After that, the micro-trench is backfilled with an aggregate and another acceptable material. The risks of this technique (e.g., as described in International Patent Application Publication No. 09/935,346) include accidentally severing an existing utility line, damaging the integrity of the road surface, and risks to installers due to traffic and other safety concerns. Micro-trenching is not preferred in surfaces such as in private roads, shallow road surfaces, bridges, and tunnels, to name a few.
U.S. Pat. No. 9,588,315 discloses a tubular body installation method by the present inventor that may help address some of the problems described above. This prior patent is hereby incorporated by reference. The tubular body or communication line installation method may involve applying a communication line or tubular body directly on to the surface. An uncured protectant may subsequently be applied on top of the tubular body that is on the surface and shaped to form a protective layer around the communication line or tubular body that is on the surface. When the protectant cures, the communication line or tubular body is adhered to the surface while being protectively encased in the cured protectant.
One issue that may arise when employing the installation method disclosed in the inventor's prior patent (U.S. Pat. No. 9,588,315) is that the communication line or tubular body may not be smoothly/uniformly applied to the surface due to slight surface defects, cavities, cracks, etc. That is, a natural roadway surface includes irregularities that can affect the installation and affixation of some communication lines. For example, a fiber optic cable may possess a very small diameter (e.g., approximately 80-900 microns), and so even small irregularities (e.g., even at a microscopic level) in the roadway surface may affect the installation of the cable and/or the ability to adhere the cable directly to the surface. For example, the distributed optical fiber could receive areas of point-stress as the length of the fiber is not making uniform contact along an uneven surface.
The deployment method disclosed in this application includes a step of smoothing (as further elaborated on below) the surface before the installation of the cable. Another aspect of the disclosure involves a deployment apparatus and a deployment system that involves smoothing the surface before deploying the tubular body or communication line on to the surface. The tubular body may thus be installed with greater precision and may result in a stronger adhering bond to the surface. For example, the installation in this manner may further reduce point loads along the length of the tubular body (e.g., an optical fiber). The smoothing process may provide a benefit in better bonding the protective material to the surface (and thus the tubular body within the protective material to the surface) while not compromising the integrity of the surface by opening a channel into and/or extending below the surface that allows for the ingress of water or any other undesired fluids/materials into and below the surface.
One aspect of the disclosure involves a method for adhering a tubular body onto a surface that includes smoothing a linear portion of the surface to create a smoothed linear segment of the surface and applying a tubular body directly onto the smoothed linear segment of the surface after the smoothing of the linear portion of the surface. The surface at the smoothed linear segment is more smooth (smoother) than the surface at a remainder of the surface. The method further includes applying an uncured protectant directly onto the tubular body while the tubular body is directly on the smoothed linear segment of the surface and curing the uncured protectant into a cured protectant while the uncured protectant is directly on the tubular body on the smoothed linear segment of the surface. The cured protectant protectively encases and adheres the tubular body to the surface.
In another aspect, the disclosure relates to a deployment apparatus for adhering a communication line to a surface. The apparatus includes a main body that is moveable in an advancing direction and a smoothing apparatus connected to the main body. The smoothing apparatus is configured to contact the surface and smooth a linear segment of the surface when the apparatus moves in the advancing direction. The apparatus includes a communication line holder configured to deploy the communication line onto the linear segment of the surface. The communication line holder is mounted on the main body. The communication line holder is positioned closer to the rear end of the main body than the communication line holder so that smoothing apparatus contacts the linear segment of the surface to smooth the linear segment of the surface before the communication line is deployed on to the linear segment of the surface. The apparatus has a container configured to store an uncured protectant. The container is mounted on the main body. The apparatus includes a protectant applicator connected to the container and configured to eject the protectant onto the surface. The protectant applicator is positioned closer to the rear end of the main body than the communication line holder so that the ejected protectant is applied onto the communication line that has been deployed on the surface.
The dimensions in the figures may be exaggerated for illustrative purposes.
At a high level, the deployment apparatus is configured to: smooth a segment of the surface with a smoothing apparatus 124, apply the tubular body 102 onto the segment of the surface that has been smoothed, and apply an uncured protectant onto the tubular body 102. When the uncured protectant cures into a cured protectant 104, the tubular body 102 may be firmly adhered to the surface 100 while being encased within the cured protectant 104. The cured protectant 104 may help protect the tubular body 102 from damage (e.g., due to vehicle tires, weather forces, snow plows, etc.).
The deployment apparatus includes a main body, which the other components discussed here may be mounted on to (i.e., connected or attached to). A deployment system may also be employed, where the different features described here are mounted on different apparatuses. One skilled in the art will recognize that different configurations and apparatuses can be used to implement the method described in this application.
The deployment apparatus may include the smoothing apparatus 124 as mentioned above.
As discussed in the background section above, many surfaces may contain irregularities such as cracks, crevices, protrusions, etc. The irregularities may be very small and may be difficult or even impossible to detect with the unaided eye (i.e., naked eye). If the surface 100 that receives the tubular body 102 has these irregularities, the bond between the tubular body 102 and the surface 100 may not be as strong (for example, a portion of the tubular body 102 may be on a protrusion of the surface and thus not be fully encased by the cured protectant 104). Additionally, irregularities in the surface 100 could damage the tubular body 102, especially if the tubular body 102 is relatively small (and relatively fragile), such as a fiber optic cable.
Therefore, the smoothing apparatus 124 contacts the surface 100 to smooth the surface 100. In other words, the smoothing apparatus 124 levels the surface 100 (i.e., makes the surface 100 more planar than prior to the smoothing) to remove irregularities that may exist in the surface. More specifically, the smoothing apparatus 124 contacts only a portion of the surface 100. When the deployment apparatus advances in the advancing direction 130, the smoothing apparatus 124 levels (i.e., smooths) a segment of the surface 100, so that the leveled (i.e., smoothed) segment of the surface 100 is more smooth (i.e., possesses less irregularities) relative to the other portions of the surface that were not contacted by the smoothing apparatus 124. In some embodiments, the smoothing apparatus 124 may be configured to level (i.e., smooth) a linear segment or a linear strip of the surface 100, so that the tubular body 102 may be easily applied to the smoothed linear segment or linear strip of the surface 100. Note that the “linear” segment does not need to be entirely linear. For example, the linear segment 200 can possess changes in direction and/or small curves depending on the orientation of the surface 100 and/or any obstacles on the surface 100. In general, the linear segment 200 will extend in a relatively linear fashion, but the linear segment is not limited to being strictly linear.
Additional examples of the smoothing apparatus 124 and features thereof are explained below in relation to
In some embodiments, the deployment apparatus includes a protectant shaping template 110, which is mounted to a protectant applicator 120 as shown in
In some embodiments, an air pump 132 may be attached to the protectant container 118. The air pump 132 may provide a constant or intermittent positive pressure to the interior of the protectant container 118. The air pump 132 may thus be configured to cause uncured protectant within the container to be ejected out of the protectant application (i.e., out of the nozzle or discharge hole as shown in
A curing lamp 122 may be mounted to chassis 126 in some embodiments as shown in
The protectant container 118 may hold (i.e., store or contain) an unshaped protectant 108 material as discussed above. The unshaped protectant 108 can be moved from the protectant container 118 and into the protectant applicator 120 by, for example, a positive air pressure applied by the air pump 132. The apparatus does not have to have an air pump 132, however, as positive pressure may also be introduced into the protectant container 118 by many other methods. In some embodiments, no positive pressure may be applied, and instead the uncured protectant is released due to gravity.
The protectant applicator 120 is configured to eject the unshaped protectant 108 onto the bare communication line 112 that is on the surface 100. The unshaped protectant 108 may be applied in this manner to completely surround the bare communication line 112 as it lays on surface 100.
As noted above, the deployment apparatus may include a protectant shaping template 110. The protectant shaping template 110 may be positioned behind where the bare communication line 112 is applied in the advancing direction 130 (i.e., the protectant shaping template 110 may contact the ground at a position more towards the rear side relative to where the bare communication line 112 is applied). The unshaped protectant 108 (along with the bare communication line 112) may pass through protectant shaping template 110 when the deployment apparatus is moved in the advancing direction 130. The protectant shaping template 110 may shape the unshaped protectant into a shaped protectant 106 as shown in
The deployment apparatus may include a curing lamp 122 in some embodiments. An example of a curing lamp 122 is shown in
The unshaped protectant 108 held in protectant container 118 of the embodiment of
A curing lamp 122 may be tailored to the specific protectant used.
The protectant container 118 and protectant applicator 120 may be opaque to ultraviolet light to block the light from causing any unwanted curing inside these components.
The overall material thickness of the cured protectant 104 may be approximately three to ten millimeters. The cured protectant 104 may not degrade the frictional coefficient required by a vehicle tire against surface 100, even when wet.
When the protectant cures, the shape of cured protectant 104 may take the shape shown in
Importantly, the smoothed linear segment 300 may be formed without cutting into the surface 100. The smoothed linear segment 300 may be formed by simply smoothing, etching, sanding, shaving, indenting, or leveling the surface irregularities 205 that may be naturally formed in the surface 200. The smoothed linear segment 300 may be formed without using a cutting tool, a saw, or other similar apparatus that cuts a groove into the surface 100.
The smoothed linear segment 400 may possess angled side walls 410. These angled side walls 410 formed within the surface irregularities 205 may facilitate retaining the cured protectant 104 within the smoothed linear segment 400. The shape of the angled side walls 410 is not limited in any respect, however, and could be curved, angled inward, angled outward, etc. Using a smoothing apparatus 124 that creates angled side walls 410, however, may be particularly beneficial in creating a strong bond between the protectant and the surface 100.
As discussed above,
The smoothing apparatus 124 of
The smoothing apparatus 410 may be used with the deployment apparatus illustrated in
The smoothing apparatus 124, 410 could also be non-reciprocating. For example, the smoothing apparatus 124, 410 could simply be pressed against the surface to level/smooth the surface as the deployment apparatus advances without being a reciprocating (rotating) wheel or other body. The smoothing apparatus 124, 410 could in some embodiments be a spike or similar object (e.g., a blunt force impactor such as a ball bearing or rod) that contacts the surface to form a smoothed linear segment 200, 300, 400 in the surface 100.
In some embodiments, the smoothing apparatus 124, 410 could be relatively heavy. That is, the smoothing apparatus 124, 410 and could smooth the surface 100 by compressing the surface 100 by virtue of the weight of the smoothing apparatus 124, 410. When the smoothing apparatus 124, 410 is a non-reciprocating body that levels the surface 100 by applying a relatively heavy weight on to the surface, the smoothed linear segment 200, 300, 400 may be a small indentation into the surface. In other words, the relatively heavy smoothing apparatus 124, 410 may level/smooth the surface 100 by indenting the surface 100.
The shape of the smoothing apparatus 124, 410 is in no way limited to the embodiments shown in
In some embodiments, the smoothing apparatus 124, 410 could be heated. That is, the temperature of the smoothing apparatus 124, 410 that contacts the surface 100 could be raised to be higher than ambient temperature (for example, significantly higher, such as 50° F., 100° F., 200° F., 300° F., or more above the ambient temperature). The smoothing apparatus 124, 140 may thus cause at least some melting of the surface 100, which becomes the smoothed linear segment 200, 300, 400. Heating the smoothing apparatus 124, 140 may be performed in conjunction with any of the embodiments discussed above, or may be performed separately as the way to smooth the surface 100.
The tubular body 102 shown in
Deploying the tubular body 102 to provide for the benefits described above is not limited to a sinusoidal pattern as shown in
While various exemplary embodiments of the disclosed deployment apparatus, deployment system, and deployment method have been described above, it should be understood that these exemplary embodiments have been presented for purposes of example only, and are not limitations. The exemplary embodiments are not exhaustive and do not limit the disclosure to the precise form disclosed. Modifications and variations are possible in light of the above teachings or may be acquired from practicing of the disclosure, without departing from the breadth or scope.
This application is a continuation of U.S. application Ser. No. 16/047,799, filed Jul. 27, 2018, which claims benefit of and priority to U.S. Provisional Application No. 62/538,189, filed Jul. 28, 2017, each of which is incorporated by reference herein in its entirety.
Number | Date | Country | |
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62538189 | Jul 2017 | US |
Number | Date | Country | |
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Parent | 16047799 | Jul 2018 | US |
Child | 17095429 | US |