Patent Grant
10145080
The invention relates to sediment-control fences that are structurally enhanced to provide improved performance.
Silt fences have been installed in topographically low areas where concentrated flow will collect, often resulting in the overtopping and failure of such fencing. Conventional silt fences have not been structurally capable of resisting the forces associated with high water depths accumulating behind the fence and hydrodynamic forces associated with overtopping. Recent developments in silt fencing include hybrid fabrics with graduated sections of geotextile material having increasing water flux rates directly correlating with increasing fence height. However, these hybrid-fabric fences are not effective in preventing overtopping due to the overwhelming magnitude of runoff flow rates associated with storm events. Wire or chain-link backing has been used on silt fences in order to provide added tensile strength and high-modulus support so that the fabric portion of the fence does not excessively deflect/elongate/sag and ultimately fail due to high tensile stresses, fabric tearing and overtopping.
The present invention provides sediment-control fences that are structurally enhanced to prevent failure due to hydrostatic and hydrodynamic forces. The sediment-control fences comprise a permeable geotextile material and reinforcing straps located at controlled heights. The reinforcing straps provide added strength and stiffness at key structural locations along the height of the sediment-control fence.
An aspect of the present invention is to provide a sediment-control fence comprising: a permeable geotextile material having a lower grade line and an upper edge defining an installed height extending between the lower grade line and the upper edge, an overtopping strap adjacent to the upper edge of the permeable geotextile material, and a primary center of pressure strap running along a length of the permeable geotextile material at a height between the lower grade line and the upper edge corresponding to a height of the center of pressure at overtopping.
Another aspect of the present invention is to provide a sediment-control fence system comprising: anchoring posts, a permeable geotextile material having a lower grade line and an upper edge defining an installed height extending between the lower grade line and the upper edge, an overtopping strap adjacent to the upper edge of the permeable geotextile material, and a primary center of pressure strap running along a length of the permeable geotextile material at a height between the lower grade line and the upper edge corresponding to a height of the center of pressure at overtopping, wherein the sediment-control fence is attachable to the anchoring posts with a plurality of fasteners.
These and other aspects of the present invention will be more apparent from the following description.
The present invention provides sediment-control fences designed to withstand hydrostatic forces associated with elevated backwater against the fence that may be equal to the maximum above-ground height of the fence. The sediment-control fences of the present invention may be used without the necessity of wire or chain-link backed supports that are conventionally used to resist structural failure due to hydraulic overtopping of the fence.
In accordance with certain embodiments, the upper portion 12 has an upper edge 22 and the lower portion 14 has a bottom edge 24. When the lower portion 14 is secured below grade, a lower grade line 26 of the sediment-control fence 5 is formed. The lower grade line 26 is formed at the portion of the sediment-control fence 5 intersecting the ground surface. As shown in
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In accordance with embodiments of the invention, the overtopping strap 32 may be located adjacent to the upper edge 22 of upper portion 12. The pressure straps 34, 36 and 38 are located at controlled heights from the lower grade line 26, as measured from the center of each pressure strap to the lower grade line 26. Each of the overtopping strap 32 and pressure straps 34, 36 and 38 have widths that are selected to provide desired mechanical properties for the sediment-control fence 5 while providing the desired water flow characteristics. For example, the primary center of pressure strap 34 has a width labeled WS, as shown in
The primary center of pressure strap 34 is located at a height HCPS from the lower grade line 26, as shown in
The secondary center of pressure strap 36 is located at a height HSPS from the lower grade line 26, as shown in
The upper pressure strap 38 is located at a height HUPS from the lower grade line 26, as shown in
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Each of the reinforcing straps 32, 34, 36 and 38 has a width WS selected to provide desired properties, such as strength and stiffness, at key structural locations along the height of the sediment-control fence 5 that will encounter elevated hydrostatic and hydrodynamic stresses and forces. For example, the widths WS of the reinforcing straps 32, 34, 36 and 38 may range from 0.5 inch to 4 inches, or from 1 inch to 3 inches, or from 1.5 to 2.5 inches. In certain embodiments, the reinforcing straps increase the strength of the sediment-control fence and provide increased modulus over the entire installed height of the sediment-control fence 5.
In accordance with certain embodiments, the surface area of upper portion 12 of sediment-control fence 5 comprises a greater amount of permeable geotextile material 10 than reinforcing straps 32, 34, 36 and 38. For example, greater than 50 percent of the surface area of upper portion 12 may be permeable geotextile material 10, or greater than 60 percent, or greater than 75 percent.
In accordance with certain embodiments, the sediment-control fence 5 fabric may have any suitable fabric weight. For example, the fabric weight may be from 100 to 400 gsm, or from 150 to 300 gsm, or from 180 to 250 gsm.
In accordance with certain embodiments, the permeable geotextile material 10 may comprise woven filaments. For example, any suitable polymeric material can be used for the filaments of the woven permeable geotextile material 10 of the sediment-control fence 5, such as, polypropylene, polyester, polyethylene, polyethylene terephthalate, polyamide, nylon, rayon, fiberglass, polyvinylidene chloride, polytetrafluoroethylene (Teflon), aromatic polyamide aramid (Nomex), acrylic polymers, polyolefin and poly para-phenyleneterephthalamide (Kevlar) may be used. In certain embodiments, the filaments of the woven permeable geotextile material 10 may be polypropylene. Such polypropylene filaments may be formed during an extrusion process.
In certain embodiments, the filaments of the permeable geotextile material 10 may be continuous along the machine and/or transverse direction of the sediment-control fence 5. The denier of the filaments used in the permeable geotextile material 10 in the machine (warp) and transverse (fill, cross or weft) directions may be selected to provide desired properties. For example, the denier of the filaments may be from 500 to 5,000 denier, or from 700 to 3,000 denier, or from 800 to 1,300 denier. The filaments of the permeable geotextile material 10 may be provided in any suitable configuration, such as monofilament, multifilament, slit tape, fibrillated and the like. For example, the filaments of the woven permeable geotextile material 10 may be a monofilament polypropylene filament. The filaments may be any suitable cross-section shape such as semi-circular, ovular, rectangular, triangular, flat, round, hexagonal, x-shaped and the like. For example, the filaments of the permeable geotextile material 10 may comprise a substantially ovular cross-section. In the embodiment shown, the sediment-control fence 5, including the upper portion 12 and the lower portion 14, is made of a substantially consistent permeable geotextile material 10. The substantially consistent permeable geotextile material 10 results in a single flow, as more fully described below. In another embodiment, the permeable geotextile material 10 may be varied along the height of the sediment-control fence 5.
In accordance with certain embodiments, the selected filaments of the permeable geotextile material 10 may be loaded into a loom in the machine and transverse directions. The selected filaments may then be loomed or woven into the desired panel size using a selected weave such as plain, satin, twill, oxford, 3-dimensional or tubular, basket, leno, mock leno weaves and the like. For example, the permeable geotextile material 10 may be woven using a plain weave.
In accordance with certain embodiments, the overtopping strap 32 and the pressure straps 34, 36 and 38 may comprise woven filaments. For example, any suitable polymeric material can be used for the filaments of the overtopping strap 32 and the pressure straps 34, 36 and 38 of the sediment-control fence 5, such as, polypropylene, polyester, polyethylene, polyethylene terephthalate, polyamide, nylon, rayon, fiberglass, polyvinylidene chloride, polytetrafluoroethylene (Teflon), aromatic polyamide aramid (Nomex), acrylic polymers, polyolefin and poly para-phenyleneterephthalamide (Kevlar) may be used. In certain embodiments, the filaments of the overtopping strap 32 and the pressure straps 34, 36 and 38 may be polypropylene. Such polypropylene filaments may be formed during an extrusion process.
In certain embodiments, the filaments of the reinforcing straps 32, 34, 36 and 38 may be continuous along the machine and/or transverse direction of the sediment-control fence 5. The denier of the filaments used in the overtopping strap 32 and the pressure straps 34, 36 and 38 in the machine (warp) and transverse (fill, cross or weft) directions may be selected to provide desired properties. For example, the denier of the filaments may be from 500 to 5,000 denier, or from 700 to 3,000 denier, or from 800 to 1,300 denier. The filaments of the overtopping strap 32 and the pressure straps 34, 36 and 38 may be provided in any suitable configuration, such as monofilament, multifilament, slit tape, fibrillated and the like. For example, the filaments of the overtopping strap 32 and the pressure straps 34, 36 and 38 may be a monofilament polypropylene filament. The filaments may be any suitable cross-section shape such as semi-circular, ovular, rectangular, triangular, flat, round, hexagonal, x-shaped and the like. For example, the filaments of the reinforcing straps 32, 34, 36 and 38 may comprise a substantially ovular cross-section. In certain embodiments, when the reinforcing straps are formed as reinforcing strap pockets 32a, 32b, 34a, 34b and 34c, 34d, the filaments of the first layer of the reinforcing strap pocket may be the same material as the filaments of the second layer. However, the filaments of the first layer and second layer of the reinforcing straps pockets 32a, 32b, 34a, 34b and 34c, 34d may vary.
In accordance with certain embodiments, the selected filaments of the reinforcing straps 32, 34, 36 and 38 may be loaded into a loom in the machine and transverse directions. The selected filaments may then be loomed or woven into the desired panel size using a selected weave such as plain, satin, twill, oxford, 3-dimensional or tubular, basket, leno, mock leno weaves and the like. For example, the reinforcing straps 32, 34, 36 and 38 may be woven using a plain weave.
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In accordance with certain embodiments, the overtopping strap 32 and the pressure straps 34, 36 and 38, and the optional post-tensioning tendons 42, are located to withstand the hydraulic forces associated with backwater behind the sediment-control fence 5 and to provide enough stiffness, i.e., modulus, to keep the sediment-control fence 5 from sagging during rising water behind the sediment-control fence 5 and overtopping. Accordingly, the steel-wire and chain-link fence backings used for conventional silt fences are not required for the sediment-control fence 5.
The overtopping strap 32 may be located adjacent to the upper edge 22 of the upper portion 12 of the sediment-control fence 5. Overtopping results in the sediment-control fence 5 experiencing hydrodynamic forces at the upper edge 22 of upper portion 12. The location of the overtopping strap 32 provides excess stiffening at the top of the sediment-control fence 5 to resist material deflection and damage due to the hydrodynamic pressure and force experienced during overtopping.
In certain embodiments, the pressure straps 34, 36 and 38 are located at heights from the lower grade line 26 formed by the intersection of the sediment-control fence 5 and the ground surface. Depending on the water level behind the sediment-control fence 5, the center of pressure on the sediment-control fence 5 can range along the upper portion 12 height HUP of the sediment-control fence 5. The sediment-control fence 5 experiences the hydrostatic pressure resultant force FR at the center of pressure, as previously discussed. The location of the pressure straps 34, 36 and 38 along the upper portion 12 height HUP provides added strength and stiffness at the key structural locations along the fence height that will encounter the highest magnitude of hydrostatic pressure and the associated resultant force.
The primary center of pressure strap 34 is located at a height HCPS from the lower grade line 26. As shown in
The secondary center of pressure strap 36 is located at a height HSPS from the lower grade line 26. As shown in
The primary center of pressure strap 34 and the secondary center of pressure strap 36 are positioned to handle the bulk of the hydrostatic pressures experienced along the upper portion 12 height HUP as water rises behind the sediment-control fence 5 from the ground surface up to the upper edge 22 of the sediment-control fence 5. The primary center of pressure strap 34 and the secondary center of pressure strap 36, along with lower portion 14 of the sediment-control fence 5 secured below grade, provide added tensile strength and modulus for the lower third of the upper portion 12 height HUP of the sediment-control fence 5.
The upper pressure strap 38 is located at a height HUPS from the lower grade line 26. At least a portion of the upper pressure strap 38 is located to optimize the stiffness or modulus of the sediment-control fence 5 in its upper region. In certain embodiments, the height HUPS of the upper pressure strap 38 is at or above the midpoint between the overtopping strap 32 and the primary center of pressure strap 34. Providing additional reinforcing straps at a height from 35 to 65 percent of the upper portion 12 height HUP, e.g., from 40 to 60 percent, may not add any appreciable, required structural benefit. In addition, reinforcing straps at these heights reduce the needed flux and permittivity through the sediment-control fence 5, since the reinforcing straps 32, 34, 36 and 38 may have a lower flux and permittivity than the permeable geotextile material 10. Locating the upper pressure strap at a height HUPS at or above the midpoint between the overtopping strap 32 and the primary center of pressure strap 34 allows for a larger surface area of the permeable geotextile material 10 between the primary pressure strap 34 and the upper pressure strap 38. This relatively large surface area allows for the backwater behind the sediment-control fence 5 to filter through permeable geotextile material 10 more readily. For example, the upper portion 12 height HUP may be 32 inches. The upper pressure strap 38 may have a strap width WS of 2 inches. The upper pressure strap 38 may be located at a height HUPS from 23 inches from the lower grade line 26. In certain embodiments, the upper pressure strap 38 is located at a height HUPS from 67 to 77 percent of the upper portion 12 height HUP, e.g., from 69 to 75 percent, or from 70 to 74 percent. In a particular embodiment, the upper pressure strap 38 may be located at a height HUPS 71.8 percent of the upper portion 12 height HUP.
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In accordance with certain embodiments, when the overtopping strap 132 and the primary center of pressure strap 134 are formed as reinforcing strap pockets they may contain post-tensioning tendons 142. The post-tensioning tendons 142 may be of the same or similar construction as the post-tensioning tendons 42 described in the previous embodiment as shown in
The woven permeable geotextile material 110 of the sediment-control fence 105 may be of the same or similar construction as the permeable geotextile material 10 described in the previous embodiment. Furthermore, the overtopping strap 132 and the primary center of pressure strap 134 may be of the same or similar construction as the reinforcing straps 32, 34, 36 and 38 as described in the previous embodiment.
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In accordance with certain embodiments, the permeable geotextile materials 10 and 110, the overtopping straps 32 and 132, the pressure straps 34, 36, 38 and 134, and the post-tensioning tendons 42 and 142 of the sediment-control fences 5 and 105 may be designed to meet certain minimum specifications, such as minimum average roll values (MARVs). As used herein, the term “minimum average roll value” or “MARV” corresponds to the mean value for a selected property of the sediment-control fence minus two standard deviations. It is to be understood that MARVs individually, and in combination, may be adjusted as desired in order to achieve the desired performance characteristics.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have an ultimate grab tensile strength in the machine direction MARV of greater than 350 lbs, or at least 360 lbs, or at least 380 lbs, or at least 400 lbs, as measured according to the ASTM D4632 standard. The term “ASTM” means American Society for Testing and Materials. The ultimate grab tensile strength in the machine direction MARV measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 360 to 3,700 lbs or more, for example, from 380 to 1,500 lbs, or from 400 to 1,000 lbs, as measured according to the ASTM D4632 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have an ultimate grab tensile strength in the transverse direction MARV of at least 370 lbs, or at least 390 lbs, or least 410 lbs, as measured according to the ASTM D4632 standard. The ultimate grab tensile strength in the transverse direction MARV measured at a non-reinforced permeable geotextile material 10 portion of the sediment-control fence may typically range from 370 to 3,700 lbs or more, for example, from 390 to 1,500 lbs, or from 410 to 1,000 lbs, as measured according to the ASTM D4632 standard.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence comprising at least one of the reinforcing straps and the permeable geotextile material may have an ultimate grab tensile strength in the machine direction MARV of at least 400 lbs, or at least 500 lbs, or at least 600 lbs, or at least 650 lbs, as measured according to a modified ASTM D4632 standard. As used herein, the term “modified ASTM D4632” means that ASTM D4632 is modified by centering a reinforcing strap of the sediment-control fence in the clamps of the test grip. The ultimate grab tensile strength in the machine direction MARV measured at one of the reinforcing straps may typically range from 400 to 7,400 lbs or more, for example, from 500 to 3,000 lbs, or from 600 to 2,500 lbs, or from 650 to 2,000 lbs, as measured according to a modified ASTM D4632 standard.
In accordance with certain embodiments, the ultimate grab tensile strength in the machine direction of the reinforced portions of the sediment-control fence is greater than or equal to the ultimate grab tensile strength in the machine direction of the permeable geotextile material. The ultimate grab tensile strength in the machine direction of the reinforced portions of the sediment-control fence comprising at least one reinforcing strap may typically be from 20 to 200 percent or more greater than the ultimate grab tensile strength in the machine direction of the permeable geotextile material, for example, from 40 to 180 percent greater, or from 60 to 160 percent greater.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence comprising the permeable geotextile material, at least one reinforcing strap, and a post-tensioning tendon may have an ultimate grab tensile strength in the machine direction MARV of at least 1,000 lbs, or at least 1,500 lbs, or at least 3,300 lbs, as measured according to a modified ASTM D4632 standard. The ultimate grab tensile strength in the machine direction MARV measured at the reinforced portion of the sediment-control fence comprising the permeable geotextile material, at least one reinforcing strap, and a post-tensioning tendon may typically range from 1,000 to 14,000 lbs or more, for example, from 1,500 to 6,000 lbs, or from 1,800 to 4,000 lbs, as measured according to a modified ASTM D4632 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have an ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 2,000 lbs/ft, or least 3,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the permeable geotextile material. The ASTM D4595 test is performed for the installed height of the permeable geotextile material by performing a series of ASTM D4595 tests on 8-inch wide test specimens across the installed height of the permeable geotextile material. The ultimate wide-width tensile strength in the machine direction MARV measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 1,000 to 11,000 lbs/ft or more, for example, from 2,000 to 7,000 lbs/ft, or from 3,000 to 9,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the permeable geotextile material.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have an ultimate wide-width tensile strength in the transverse direction MARV of at least 1,000 lbs/ft, or at least 2,000 lbs/ft, or least 3,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the permeable geotextile material. The ultimate wide-width tensile strength in the transverse direction MARV measured for the woven permeable geotextile material of the sediment-control fence may typically range from 1,000 to 11,000 lbs/ft or more, for example, from 2,000 to 7,000 lbs/ft, or from 3,000 to 6,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the permeable geotextile material.
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In accordance with certain embodiments, the sediment-control fence 5 comprising the permeable geotextile material 10 and reinforcing straps 32, 34, 36 and 38 may have an ultimate wide-width tensile strength in the transverse direction MARV of at least 1,000 lbs/ft, or at least 2,500 lbs/ft, or least 3,000 lbs/ft, or at least 3,500 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5. The ultimate wide-width tensile strength in the transverse direction MARV measured for the sediment-control fence 5 comprising the permeable geotextile material 10 and reinforcing straps 32, 34, 36 and 38 may typically range from 1,000 to 18,000 lbs/ft or more, for example, from 2,500 to 14,000 lbs/ft, or from 3,000 to 10,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5.
In accordance with certain embodiments, the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 32, 34, 36 and 38, and post-tensioning tendons 42 may have an ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 4,000 lbs/ft, or least 5,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5. The ASTM D4595 test is performed for the installed height of the sediment-control fence 5 by performing a series of ASTM D4595 tests on 8-inch wide test specimens across the installed height of the sediment-control fence 5. The ultimate wide-width tensile strength in the machine direction MARV measured for the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 32, 34, 36 and 38, and post-tensioning tendons 42 may typically range from 1,000 to 25,000 lbs/ft or more, for example, from 4,000 to 16,000 lbs/ft, or from 5,000 to 12,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5.
In accordance with certain embodiments, the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 32, 34, 36 and 38, and tendons 42 may have an ultimate wide-width tensile strength in the transverse direction MARV of at least 1,000 lbs/ft, or at least 4,000 lbs/ft, or least 5,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5. The ultimate wide-width tensile strength in the transverse direction MARV measured for the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 32, 34, 36 and 38, and tendons 42 may typically range from 1,000 to 25,000 lbs/ft or more, for example, from 4,000 to 16,000 lbs/ft, or from 5,000 to 11,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5.
In accordance with certain embodiments, the sediment-control fence 105 comprising the permeable geotextile material 110, reinforcing straps 132, 134, and tendons 142 may have an ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 2,000 lbs/ft, or least 2,500 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 105. The ASTM D4595 test is performed for the installed height of the sediment-control fence 105 by performing a series of ASTM D4595 tests on 8-inch wide test specimens across the installed height of the sediment-control fence 105. The ultimate wide-width tensile strength in the machine direction MARV measured for the sediment-control fence 105 comprising the permeable geotextile material 110, reinforcing straps 132, 134, and tendons 142 may typically range from 1,000 to 10,000 lbs/ft or more, for example, from 2,000 to 6,500 lbs/ft, or from 2,500 to 5,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 105.
In accordance with certain embodiments, the sediment-control fence 105 comprising the permeable geotextile material 110, reinforcing straps 132, 134, and tendons 142 may have an ultimate wide-width tensile strength in the transverse direction MARV of at least 1,000 lbs/ft, or at least 1,500 lbs/ft, or least 2,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 105. The ultimate wide-width tensile strength in the transverse direction MARV measured for the sediment-control fence 105 comprising the permeable geotextile material 110, reinforcing straps 132, 134, and tendons 142 may typically range from 1,000 to 10,000 lbs/ft or more, for example, from 1,500 to 6,500 lbs/ft, or from 2,700 to 11,000 lbs/ft, as measured according to ASTM D4595 across the installed height of the sediment-control fence 105.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10 and a combination of any two reinforcing straps such as 32, 34, 36 and 38 may have a may have an 8-inch ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 2,000 lbs/ft, or least 3,000 lbs/ft, or at least 3,500 lbs/ft, as measured according to the ASTM D4595 standard. For example, the reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10 and the reinforcing straps 34 and 36 may have an 8-inch ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 2,000 lbs/ft, or least 3,000 lbs/ft, as measured according to the ASTM D4595 standard. The 8-inch ultimate wide-width tensile strength in the machine direction MARV measured at the reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10 and a combination of any two reinforcing straps such as 32, 34, 36 and 38 may typically range from 1,000 to 14,000 lbs/ft or more, for example, from 2,000 to 9,100 lbs/ft, or from 3,000 to 7,800 lbs/ft, as measured according to the ASTM D4595 standard.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10, a combination of any two reinforcing straps such as 32, 34, 36 and 38, and tendons 42 may have an 8-inch ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 2,500 lbs/ft, or least 3,500 lbs/ft, or at least 4,000 lbs/ft, as measured according to the ASTM D4595 standard. For example, the reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 34 and 36, and tendons 42 may have an 8-inch ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 2,500 lbs/ft, or least 3,500 lbs/ft, as measured according to the ASTM D4595 standard. The 8-inch ultimate wide-width tensile strength in the machine direction MARV measured at the reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10, a combination of any two reinforcing straps such as 32, 34, 36 and 38, and tendons 42 may typically range from 1,000 to 25,000 lbs/ft or more, for example, from 2,500 to 16,000 lbs/ft, or from 3,500 to 11,000 lbs/ft, as measured according to the ASTM D4595 standard.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence 105 comprising the permeable geotextile material 110, at least one of strap 132, 134, and a tendon 142 may have an 8-inch ultimate wide-width tensile strength in the machine direction MARV of at least 1,000 lbs/ft, or at least 1,500 lbs/ft, or least 2,500 lbs/ft, as measured according to the ASTM D4595 standard. The 8-inch ultimate wide-width tensile strength in the machine direction MARV measured for the reinforced portion of the sediment-control fence 105 comprising the permeable geotextile material 110, at least one of strap 132, 134, and a tendon 142 may typically range from 1,000 to 10,000 lbs/ft or more, for example, from 1,500 to 6,500 lbs/ft, or from 2,500 to 5,000 lbs/ft, as measured according to the ASTM D4595 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have a modulus in the machine and transverse directions of at least 500 lbs/ft, or at least 3,000 lbs/ft, or least 4,000 lbs/ft, as measured according to the ASTM D4595 standard, which provides both the material ultimate tensile strength and elongation (i.e., strain), and using the calculation for modulus. As used herein, the term “calculation for modulus” means taking the ultimate tensile strength of the material (force units) and dividing the ultimate tensile strength by the elongation (using the decimal value of the % elongation). The modulus in the machine and transverse directions measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 500 to 40,000 lbs/ft or more, for example, from 3,000 to 35,000 lbs/ft, or from 4,000 to 25,000 lbs/ft, as measured according to the ASTM D4595 standard and using the calculation for modulus.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10 and a combination of any two reinforcing straps such as 32, 34, 36 and 38 may have a modulus in the machine direction of at least 600 lbs/ft, or at least 4,000 lbs/ft, or least 5,500 lbs/ft, as measured according to the ASTM D4595 standard and using the calculation for modulus. For example, the reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10 and reinforcing straps 34, 36, may have a modulus of at least 600 lbs/ft, or at least 4,000 lbs/ft, or least 5,000 lbs/ft, as measured according to the ASTM D4595 standard and using the calculation for modulus. The modulus measured at a reinforced portion of the sediment-control fence may typically range from 600 to 55,000 lbs/ft or more, for example, from 4,000 to 45,000 lbs/ft, or from 5,000 to 35,000 lbs/ft, as measured according to the ASTM D4595 standard and using the calculation for modulus.
In accordance with certain embodiments, a reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10, a combination of any two reinforcing straps such as 32, 34, 36 and 38, and tendons 42 may have a modulus in the machine direction of at least 1,000 lbs/ft, or at least 4,000 lbs/ft, or least 5,500 lbs/ft, as measured according to the ASTM D4595 standard and using the calculation for modulus. For example, the reinforced portion of the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 34, 36, and tendons 42 may have a modulus in the machine direction of at least 1,000 lbs/ft, or at least 4,000 lbs/ft, or least 5,500 lbs/ft, as measured according to the ASTM D4595 standard and using the calculation for modulus. The modulus in the machine direction measured at a reinforced portion of the sediment-control fence comprising the permeable geotextile 10, at least one strap 32, 34, 36 and 38, and a tendon 42 may typically range from 1,000 to 60,000 lbs/ft or more, for example, from 4,000 to 50,000 lbs/ft, or from 5,500 to 40,000 lbs/ft, as measured according to the ASTMD4595 standard and using the calculation for modulus.
In accordance with certain embodiments, the modulus of the reinforced portions of the sediment-control fence in the machine direction is greater than or equal to the modulus of the permeable geotextile material. The modulus of the reinforced portions of the sediment-control fence may be from 10 to 500 percent or more greater than the modulus of the permeable geotextile material, for example, from 100 to 400 percent, or from 150 to 300 percent.
In accordance with certain embodiments, the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 32, 34, 36 and 38, and tendons 42 may have an overall stiffness, i.e., modulus in the machine and transverse directions that is greater than the stiffness of the permeable geotextile material 10. For example, the sediment-control fence 5 may have an overall modulus in the machine and transverse directions that is at least 1,500 lbs/ft, or at least 4,500 lbs/ft, or at least 6,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5 and using the calculation for modulus. The overall modulus in the machine and transverse directions of the sediment-control fence 5 comprising the permeable geotextile material 10, reinforcing straps 32, 34, 36 and 38, and tendons 42 may typically range from 1,500 to 150,000 lbs/ft or more, for example, from 4,500 to 90,000 lbs/ft, or from 6,000 to 70,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 5 and using the calculation for modulus.
In accordance with certain embodiments, the sediment-control fence 105 comprising the permeable geotextile material 110, reinforcing straps 132, 134, and tendons 142 may have an overall stiffness, i.e., modulus in the machine and transverse directions that is greater than the stiffness of the permeable geotextile material 110. For example, the sediment-control fence 105 may have an overall modulus in the machine and transverse directions that is at least 1,500 lbs/ft, or at least 2,000 lbs/ft, or at least 3,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 105 and using the calculation for modulus. The overall modulus in the machine and transverse directions of the sediment-control fence 105 comprising the permeable geotextile material 110, reinforcing straps 132, 134, and tendons 142 may typically range from 1,500 to 60,000 lbs/ft or more, for example, from 2,000 to 30,000 lbs/ft, or from 3,000 to 15,000 lbs/ft, as measured according to the ASTM D4595 standard across the installed height of the sediment-control fence 105 and using the calculation for modulus.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have an apparent opening size, a flux and a permittivity. For example, the apparent opening size MARV of the woven permeable geotextile material may be from No. 30 (0.6 mm) to No. 200 Sieve (0.075 mm), or from No. 40 (0.425 mm) to No. 120 Sieve (0.125 mm), or from No. 50 (0.3 mm) to No. 70 Sieve (0.212 mm), as measured according to the ASTM D4751 standard. The clean-water flux MARV of the woven permeable geotextile material may be from 10 to 225 gpm/ft2 or more, or from 50 to 150 gpm/ft2, or from 70 to 125 gpm/ft2, as measured according to the ASTM D4491 standard. The permittivity MARV of the woven permeable geotextile material may be from 0.1 to 3.0 sec−1 or more, or from 0.75 to 2.0 sec−1, or from 0.9 to 1.5 sec−1, as measured according to the ASTM D4491 standard.
In accordance with certain embodiments, the permeable geotextile material of the sediment-control fence may have a substantially consistent apparent opening size, clean-water flux and permittivity along the upper portion height HUP of sediment-control fence. This results in a single rate of water flow through the permeable geotextile material of the sediment-control fence.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have a CBR puncture MARV of at least 200 lbs, or at least 600 lbs, or at least 800 lbs, as measured according to the ASTM D6241 standard. The term “CBR” means California Bearing Ratio. The CBR puncture MARV measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 200 to 4,000 lbs or more, for example, from 600 to 3,500 lbs, or from 800 to 3,000 lbs, as measured according to the ASTM D6241 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have a trapezoidal tear in the machine direction MARV of at least 50 lbs, or at least 75 lbs, or at least 120 lbs, as measured according to the ASTM D4533 standard. The trapezoidal tear in the machine direction MARV measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 50 to 1,000 lbs or more, for example, from 75 to 800 lbs, or from 120 to 500 lbs, as measured according to the ASTM D4533 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have a trapezoidal tear in the transverse direction MARV of at least 50 lbs, or at least 75 lbs, or at least 120 lbs, as measured according to the ASTM D4533 standard. The trapezoidal tear in the transverse direction MARV measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 50 to 1,000 lbs or more, for example, from 75 to 800 lbs, or from 120 to 500 lbs, as measured according to the ASTM D4533 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have a mullen burst MARV of at least 200 psi, or at least 500 psi, or at least 600 psi, as measured according to the ASTM D3786 standard. The mullen burst MARV measured at a non-reinforced permeable geotextile material 10 portion of the sediment-control fence may typically range from 200 to 2,500 psi or more, for example, from 500 to 2,000 psi, or from 600 to 1,500 psi, as measured according to the ASTM D3786 standard.
In accordance with certain embodiments, the woven permeable geotextile material of the sediment-control fence may have an UV stability MARV of at least 90 percent tensile strength retained in the machine direction, or at least 95 percent tensile strength retained in the machine direction, or at least 98 percent tensile strength retained in the machine direction, as measured according to the ASTM D4355 standard. The UV stability MARV measured at a non-reinforced permeable geotextile material portion of the sediment-control fence may typically range from 90 to 100 percent tensile strength retained in the machine direction, for example, from 95 to 100 percent tensile strength retained in the machine direction, or from 98 to 100 percent tensile strength retained in the machine direction, as measured according to the ASTM D4355 standard.
Table 1 below lists MARV ranges for a permeable geotextile material 10, and for reinforced portions of a sediment-control fence 5 including reinforcing strap pockets 32, 34, 36 and 38 and post-tensioning tendons 42 in accordance with an embodiment of the present invention.
Table 2 below lists MARVs for a permeable geotextile material 110, and for reinforced portions of a sediment-control fence 105 including reinforcing strap pockets 132, and 134, and post-tensioning tendons 142 in accordance with an embodiment of the present invention.
In accordance with certain embodiments, the sediment-control fence 5, 105 may be installed according to the following process. A trench having a width and depth may be excavated. For example, the trench width (not shown) may be from about 2 to 8 inches, and the trench depth (not shown) may be from 2 to 12 inches. A plurality of anchoring posts 52, 152 having a distance apart may then be driven into the trench. For example, distance between anchoring posts may range from 2 to 20 feet, or from 3 to 15 feet, or from 4 to 10 feet. The sediment-control fence 5, 105 may then be laid out along the trench with the first end next to a first anchoring post 52, 152 and the second end next to the end anchoring post 52, 152. The bottom portion 14, 114 of the sediment-control fence 5, 105 is then placed in the trench. In a certain embodiment, after the bottom portion 14, 114 of the sediment-control fence 5, 105 is placed in the trench, the anchoring guide line 16 intersects the ground surface. Sediment-control fence 5, 105 may then be attached to the first anchoring post 52, 152. In certain embodiments, a first end of the post-tensioning tendons 42, 142 may be secured to the first anchoring post 52, 152. However, the sediment-control fence 5, 105 may not include post-tensioning tendons 42, 142. Sediment-control fence 5, 105 may then be pulled tight in the direction of the adjacent anchoring post 52, 152 in preparation for attaching the fence to the anchoring post. Sediment-control fence 5, 105 may then be attached to the adjacent anchoring post 52, 152. This attachment process may then be repeated for every anchoring post 52, 152 until the end anchoring post 52, 152 is reached. Sediment-control fence 5, 105 may then be attached to the end anchoring post 52, 152. In certain embodiments, a second end of the post-tensioning tendons 42, 142 may be secured to the end anchoring post 52, 152. However, the sediment-control fence 5, 105 may not include post-tensioning tendons 42, 142, as previously discussed.
In accordance with certain embodiments, the sediment-control fence 5, 105 may be secured to the anchoring post 52, 152 according to the following process. A fastener 54 is inserted through one of the reinforcing straps 32, 34, 36 and 38, 132, 134 of the sediment-control fence 5, 105 using any suitable means and passed around the anchoring post 52, 152 mounted in the ground. In accordance with another embodiment of the present invention, the fastener 54, 154 may be inserted through the sediment-control fence at any height along the upper portion 12, 112 height HUP of the sediment-control fence 5, 105. A fixture (not shown) with two holes may then mounted to the legs of the fastener 54, 154 and rotated by a hand tool to secure the fastener 54, 154 around the anchoring post 52, 152. Alternatively, any other suitable type of hand operated tool or power tool may be included, such as a power drill with a rotatable fixture. In accordance with certain embodiments, this process is then repeated with at a second fastener 54, 154 at a second strap 32, 34, 36 and 38, 132, 134. Alternatively, the second fastener 54, 154 may be inserted through the sediment-control fence 5, 105 at any height along the upper portion 12, 112 height HUP of the sediment-control fence 5, 105. In addition, the process may be repeated for additional fasteners 54, 154 are additional locations.
In accordance with certain embodiments, post-tensioning of the sediment-control fence 5, 105 may be performed after the trench and anchoring posts 52, 152 have been installed in the field. The first end portion of the post-tensioning tendons 42, 142 may be manually wrapped around a first installed anchoring post 52, 152 and double-tied to the anchoring post 52, 152. Alternatively, post-tensioning may be performed prior to anchoring the first anchoring post 52, 152 into the ground. Next, the tendons 42, 142 may be pulled taut across a length of 10 feet to 20 feet of the tendons 42 and secured to a pre-installed anchoring post. This tensioning process may be repeated for every 10 to 20 feet of the tendons 42, 142 until the end anchoring post 52, 152 is reached. The sediment-control fence 5, 105 may comprise vertical slits positioned every 4 to 10 feet to provide access to the post-tensioning tendons 42, 142 in order to pull the tendons partially out of the reinforcing strap pockets 32, 34, 36 and 38, 132, 134 and loop the tendons 42, 142 around each anchoring post 52, 152. The second end portion of the post-tensioning tendons 42, 142 may be manually wrapped around the end anchoring post of the fence and double-tied to the post.
In accordance with a further embodiment of the present invention, post-tensioning may be performed prior to driving the first anchoring post 52, 152 into the ground. The sediment-control fence 5, 105 may be secured to the first anchoring post 52, 152 by rotating the first post several times, wrapping the sediment-control fence 5, 105 tightly around the first anchoring post 52, 152. The first anchoring post 52, 152 may then be driven into the trench. Next, the tendons 42, 142 may be pulled taut across a length of 10 feet to 20 feet of the tendons 42, 142 and secured to a pre-installed anchoring post 52, 152. This tensioning process may be repeated for every 10 to 20 feet of the tendons 42, 142 until the end anchoring post 52, 152 is reached. The sediment-control fence 5, 105 may be secured to the end anchoring post 52, 152 by rotating the end anchoring post 52, 152 several times, wrapping the sediment-control fence 5, 105 tightly around the end anchoring post 52, 152 prior to driving the end anchoring post 52, 152 into the ground. The end anchoring post 52, 152 may then be driven into the trench.
The following example is intended to illustrate various aspects of the present invention, and is not intended to limit the scope of the invention.
A sediment-control fence similar to that shown in
Whereas particular embodiments of this invention have been described above for purposes of illustration, it will be evident to those skilled in the art that numerous variations of the details of the present invention may be made without departing from the invention as defined in the appended claims.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 62/173,736 filed Jun. 10, 2015, U.S. Provisional Patent Application Ser. No. 62/294,841 filed Feb. 12, 2016 and U.S. Provisional Patent Application Ser. No. 62/295,876 filed Feb. 16, 2016, all which are incorporated herein by reference.
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| Number | Date | Country | |
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| 20160362865 A1 | Dec 2016 | US |
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| 62173736 | Jun 2015 | US | |
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| 62295876 | Feb 2016 | US |
