EP3102742B1 - Synthetic ground cover system for erosion control - Google Patents

Synthetic ground cover system for erosion control Download PDF

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Publication number
EP3102742B1
EP3102742B1 EP15751994.3A EP15751994A EP3102742B1 EP 3102742 B1 EP3102742 B1 EP 3102742B1 EP 15751994 A EP15751994 A EP 15751994A EP 3102742 B1 EP3102742 B1 EP 3102742B1
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EP
European Patent Office
Prior art keywords
synthetic
cover system
ground cover
infill
erosion control
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.)
Active
Application number
EP15751994.3A
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German (de)
English (en)
French (fr)
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EP3102742A1 (en
EP3102742A4 (en
Inventor
Michael Ayers
Jose Urrutia
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Watershed Geosynthetics LLC
Original Assignee
Watershed Geosynthetics LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US14/186,413 external-priority patent/US9587364B2/en
Application filed by Watershed Geosynthetics LLC filed Critical Watershed Geosynthetics LLC
Publication of EP3102742A1 publication Critical patent/EP3102742A1/en
Publication of EP3102742A4 publication Critical patent/EP3102742A4/en
Application granted granted Critical
Publication of EP3102742B1 publication Critical patent/EP3102742B1/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D17/00—Excavations; Bordering of excavations; Making embankments
    • E02D17/20—Securing of slopes or inclines
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C13/00—Pavings or foundations specially adapted for playgrounds or sports grounds; Drainage, irrigation or heating of sports grounds
    • E01C13/08—Surfaces simulating grass ; Grass-grown sports grounds

Definitions

  • the prior art discloses systems for erosion protection that typically take the form of a combination of synthetic mat and natural grass. Additionally, the prior art generally requires multiple anchors to resist wind uplift and erosion forces on the synthetic mat. Thus, the industry continues to search for improved erosion protection systems which are effective, economical and meet the various local, state and federal environmental laws, rules and guidelines for these systems.
  • United States Patent Specification No. US 2012/230777 discloses a synthetic ground cover system for erosion control to be placed atop the ground, including a synthetic grass which comprises a composite of one or more geo-textiles tufted with synthetic yarns.
  • the synthetic ground cover also includes a sand/soil infill ballast applied to the synthetic grass and a binding agent applied to the sand/soil infill to stabilize the sand/soil infill against high velocity water shear forces.
  • the present application provides a composite synthetic ground cover system according to the appended claims.
  • the present invention provides a new and useful system for covering various types of sloping ground where water and wind erosion protection are needed. More particularly, in a first example form the invention comprises a synthetic ground cover system for erosion control to be placed atop substantially non-level, sloping ground, including a synthetic grass which comprises a composite of an impermeable backing and synthetic grass blade-like elements secured thereto and extending therefrom. An infill ballast is applied to the synthetic grass atop the backing and a binding agent is applied to the infill ballast to protect the infill ballast against high velocity water shear forces. With this construction, the synthetic ground cover system can remain in place atop substantially non-level, sloping ground despite shear forces from gravity, wind, and water flow.
  • the impermeable backing comprises a geotextile.
  • the impermeable backing comprises a permeable geotextile and an impermeable polymer applied to the permeable geotextile to make the backing impermeable.
  • the impermeable polymer comprises Polyethylene, Polypropylene, Polyurethane, Ethylene Propylene Diene Terpolymer (EPDM) or Polyvinyl Chloride (PVC).
  • the impermeable polymer is laminated, glued, sprayed, or coated on the permeable geotextile.
  • the impermeable polymer is non-flat for gripping the non-level, sloping ground.
  • the binding agent in the synthetic ground cover system for erosion control is cement, grout, lime or the like.
  • the binding agent can comprise a polymer.
  • the binding agent applied to the infill results in a bound infill having a depth of between about 1.27 cm and about 5.08 cm (about 1/2 inch and about 2 inches).
  • the infill is applied to the synthetic grass in a dry condition and then is wetted later to be cured into a bound infill.
  • the infill comprises a sand or granular material and the binding agent comprises cement.
  • the sand-to-cement ratio is between about 1:1 and 3:1 by weight.
  • the synthetic ground cover also includes at least one filter fabric to be placed on or in the ground and an open grid mesh positioned between the synthetic grass and the filter fabric.
  • the at least one filter fabric comprises non-woven synthetic fabric.
  • the open grid mesh comprises a synthetic drainage system.
  • the synthetic ground cover can include at least one low permeability barrier geomembrane to be placed adjacent the ground.
  • the synthetic grass has a density of between about 678.12 grams per square meter and about 4068.69 grams per square meter (about 20 ounces per square yard and 120 ounces per square yard).
  • the synthetic grass has fibers with an average length of between about 1.27 cm and 10.16 cm (about 0.5 and 4 inches) that act as reinforcement for the sand/soil infill.
  • the synthetic grass has fibers with an average length of between about 3.81 cm and 7.62 cm (about 1.5 and 3 inches).
  • the filter fabric is positioned to be in direct contact with the ground surface and comprises woven synthetic fabric.
  • the synthetic fabric can be a non-woven material.
  • method of covering ground for erosion control includes the steps of: (a) placing a synthetic grass atop the ground, the synthetic grass having a backing and synthetic grass blades extending therefrom; (b) applying a dry infill ballast to the synthetic grass; and (c) applying a wetting agent to the dry infill to cure the dry infill into a bound infill to stabilize the infill against high velocity water shear forces.
  • the dry infill ballast includes cement and the wetting agent comprises water.
  • method of covering ground for erosion control includes the steps of: (a) placing a synthetic grass atop the ground, the synthetic grass having a backing and synthetic grass blades extending therefrom; (b) applying a dry infill ballast to the synthetic grass; and (c) applying a wet binding agent to the dry infill to bond the dry infill into a bound infill to stabilize the sand/soil infill against high velocity water shear forces.
  • the dry infill ballast includes granular material and the binding agent comprises a polymer.
  • the binding agent comprises a cementitious slurry.
  • the dry infill ballast can include sand and/or gravel.
  • the present invention provides an erosion protection layer for use in embankments, ditches, levees, water channels, downchutes, landfills and other steep topographic ground conditions that are exposed to shear forces of water and winds.
  • a synthetic grass is used in combination with a bound/stabilized infill ballast to provide a new and useful ground cover system, while also providing a beneficial erosion protection system that does not require maintenance.
  • This combination (sometimes referred to as a composite material) can be used for covering slopes and lining drainage ditches, swales, and downchutes.
  • the invention comprises a synthetic ground cover system for erosion control to be placed atop the ground, including a synthetic grass which comprises a composite of one or more geo-textiles tufted with synthetic yarns.
  • the synthetic ground cover also includes a stabilized/bound infill ballast applied to the synthetic grass (stabilized against high velocity water shear forces).
  • the infill ballast comprises a sand or soil and is bound with a binding agent, such as cement, grout, lime or the like.
  • the artificial turf provides for separation of the sand infill from the ground below and the turf blades act as structural reinforcement of the sand infill while providing an aesthetically pleasing surface.
  • the sand infill on top is stabilized against washing or blowing away by a binding agent applied to the sand infill, which generally has the effect of cementing or bonding together the sand.
  • This allows the invention to resist large shear forces from water or wind.
  • the bonding strength need not be radically high. Indeed, it is not necessary to achieve a structural strength as great as concrete, for example. Instead, it is sufficient that the binding agent merely hold the sand together against erosive forces of wind and water.
  • the sand/soil is bound to the other sand particles and/or to the synthetic turf blades by the binder.
  • Figure 1 is a schematic, sectional view of an example synthetic ground cover system 110 for erosion control not according the present invention and showing the surface of the soil S covered with the present ground cover erosion control system.
  • the system includes a synthetic turf 140 which includes a backing 142 and synthetic turf blades 141 secured to the backing.
  • a stabilized/bound sand/soil infill 160 is placed in the bottom of the synthetic turf 140 above the backing 142.
  • the soil S can be topped with a sand subgrade, gravel subgrade, or intermediate cover before laying down the synthetic ground cover system 110 for erosion control, as desired.
  • the synthetic turf 140 is placed more or less directly atop the soil S.
  • the system can also be provided with additional elements interposed between the soil S and the turf 140.
  • the synthetic turf 140 is used as a principal component of the synthetic ground cover system. It can be constructed using a knitting machine or tufting machine that may use, for example, over 1 ,000 needles to produce a turf width of about 4.57 metres (about 15 feet).
  • the synthetic turf includes synthetic grass blades 141 which comprise polyethylene monofilament and/or slit-film fibrillated and non-fibrillated fibers tufted to have a blade length of between about 1.27 cm and 10.16 cm (about 0.5 inches and 4 inches). Other polymers can be used for the synthetic grass blades, as desired.
  • the synthetic grass blades 141 are tufted to have a blade length of between about 3.81 cm and 7.62 cm (about 1.5 inches and 3 inches).
  • the synthetic grass blades 141 are tufted to have a blade length of about 3.81 cm (about 1.5 inches).
  • the synthetic grass blades 141 are tufted to have a density of between about 678.12 grams per square meter and about 4068.69 grams per square meter (about 20 ounces/square yard and about 120- ounces/square yard).
  • the synthetic grass blades have a thickness of at least about 100 microns.
  • the synthetic grass blades 141 are tufted into the substrate or backing 142 comprising a synthetic woven or non-woven fabric.
  • this backing can be a single ply backing or can be a multi-ply backing, as desired.
  • a geo filter can be secured to the substrate to reinforce the substrate and better secure the synthetic grass blades.
  • the chemical composition of the synthetic turf components should be selected to resist degradation by exposure to sunlight, which generates heat and contains ultraviolet radiation.
  • the polymer yarns should not become brittle when subjected to low temperatures.
  • the selection of the synthetic grass color and texture should be aesthetically pleasing.
  • the actual grass-like components preferably consist of green polyethylene fibers 141 of about 3.81 cm to about 6.35 cm (about 1.5 to about 2.5 inches) in length tufted into a woven or non-woven geotextile(s). For added strength in severely steep sideslopes, an additional geo filter component backing can be tufted for improving dimensional stability.
  • the polyethylene grass filaments 141 preferably have an extended operational life of at least 15 years.
  • a sand/soil layer 160 of about 1.27 cm to about 5.08 cm (about 0.5 to about 2.0 inches) is placed atop the synthetic turf as infill to ballast the material and protect the system against wind uplift as well as to provide dimensional stability.
  • the infill is between about 1.27 cm and 2.54 cm (about 0.5 and 1 inches).
  • the sand/soil layer provides additional protection of the geotextiles against ultraviolet light.
  • the sand/soil ballast is bonded with cement, grout, lime or another binding agent in order to resist the shear forces of water and wind on steep side-slopes, drainage ditches and down-chutes.
  • the synthetic turf 140 is first placed over the ground and then the sand/soil infill is spread over the synthetic turf in dry form. This allows the dry infill material to easily and effectively settle into the bottom of the synthetic turf. Thereafter, the infill is watered (as by spraying water over the turf) and allowed to cure into a hardened, bound infill layer.
  • the sand/soil infill is bound to itself and is bound to the individual blades of the synthetic turf.
  • the individual blades of the turf act as anchors and help hold the bound infill in place.
  • the "sand/soil” infill includes true sands (including silica sands, quartz sands, etc), soils, clays, mixtures thereof, etc. It also includes things that are like sand or soil. For example, granular tailings from rock quarries could be employed (things like granular marble, quartz, granite, etc). Also, small gravel can be used as the "sand/soil" infill. In this regard, it is preferred that the infill be inorganic in nature so as to be very stable and long-lasting. But organic granular material could be employed in certain applications. Moreover, the binding agent could be inorganic or organic. Preferably, the binding agent is inorganic (again, for stability and long life).
  • binding agents such as organic binders
  • polymer-based binders could be used (for example, a urethane product).
  • a spray-on binding agent has come to market for binding small gravel in pathways under the brand name "Klingstone” and sold by Klingstone, Inc. of Waynesville, NC.
  • a recipe of about three parts sand and one part cement works well as a dry infill. Once wetted and cured, this bound sand infill provides an excellent ballast against lifting of the turf by wind and also resists damage or erosion from wind or rain or high water flows.
  • a recipe of about equal parts sand and cement also works well, as do ratios between these two examples.
  • recipes closer to 3:1 are generally more economical but have lower strength, while recipes closer to 1 :1 are generally stronger, but more expensive.
  • a recipe of 2:2:1 of sand/cement/lime works well also.
  • instead of lime one can use fly ash.
  • the present invention can be used even where high concentrated flows are expected (e.g. downchutes, large drainage swales).
  • a binding agent such as cement, grout, lime, etc. This creates a more or less grouted or bound sand/soil infill 160 to resist the shear forces of water flow and wind.
  • This invention combines the use of a synthetic grass to provide a pleasant visual appearance, erosion protection with very minimal maintenance.
  • the invention incorporates a bound infill that, together with the synthetic grass, can handle very rapid water run-offs.
  • the cover system of this invention can be installed on very steep slopes which typically occur in embankments, levees, dams, downchutes, landfills and stockpiles.
  • the system can be used as erosion control material that can resist large shear forces of water or wind.
  • the system can take other forms.
  • the system can comprise a membrane with a drainage layer overlain by synthetic turf having cemented (stabilized) infill using any of the binding agents described herein and the like.
  • a bottom layer includes a structured low permeable membrane (optionally with textured or spikes on bottom side and drainage studs on top side) and a top layer.
  • the top layer can include turf (with, for example, 3.81 cm (1.5 inch) pile height) and an infill of sand, lime and cement mixture.
  • the infill can be 1.91 cm (0.75 inches) of the mixture.
  • FIG 2 is a schematic, sectional view of a synthetic ground cover system 210 for erosion control according to a second example not corresponding to the present invention, shown with an open mesh grid at the bottom of the system.
  • the example cover system 210 for erosion control shown in Figure 2 is used to control erosion of the soil S.
  • the system 210 includes a lower filter fabric (geofilter) 220, an open grid mesh or geo-net 230 and a synthetic turf 240.
  • the synthetic turf 240 includes a backing 242 and blades 241 secured to the backing.
  • a stabilized/bound sand/soil infill 260 is placed in the bottom of the synthetic turf 240 above the backing 242.
  • the soil S can be topped with a sand subgrade, gravel subgrade, or intermediate cover before laying down the synthetic ground cover system 210 for erosion control, as desired.
  • the lower filter fabric 220 comprises a woven or non-woven synthetic fabric.
  • the lower filter fabric 220 can be replaced with a barrier geomembrane with low permeability.
  • Figures 3A and 3B depict a synthetic ground cover system 310 for erosion control according to a third example not corresponding to the present invention, shown without an open mesh grid at the bottom of the system.
  • the example cover system 310 for erosion control shown in these figures is used to control erosion of the soil S.
  • the system 310 includes an impermeable geomembrane 350 and a synthetic turf 340.
  • the impermeable geomembrane 350 is a polymeric sheet with slender spikes on the bottom surface and cleat-like or stud-like nubs on the top surface. For example, see upper nubs 351-354 and spikes 357-359.
  • the lower spikes help anchor the impermeable geomembrane to the soil S and the upper nubs help anchor the synthetic turf 340 to the impermeable geomembrane 350.
  • the upper nubs also provide a transmissive drainage layer or space in which water can flow over the membrane beneath the synthetic turf.
  • the synthetic turf 340 includes a backing 342 and blades 341 secured to the backing. A stabilized/bound sand/soil infill 360 is placed in the bottom of the synthetic turf 340 above the backing 342.
  • FIG 4 is a schematic, sectional view of another synthetic ground cover system 410 for erosion control not according to the present invention, shown with a reinforcement layer on the backing of the synthetic turf.
  • the example cover system 410 for erosion control shown in Figure 4 is used to control erosion of the soil S.
  • the system 410 includes a synthetic turf 440 which includes a backing 442 and blades 441 secured to the backing.
  • the backing 442 can be a single ply backing or a multi-ply backing.
  • a urethane barrier 443 is applied to the underside of the backing 442 and acts to both strengthen the backing and the connection between the blades 441 and the backing 442.
  • the urethane barrier 443 also makes the backing 442 generally impermeable to water.
  • a stabilized/bound sand/soil infill 460 is placed in the bottom of the synthetic turf 440 above the backing 442.
  • Figures 5A and 5B show the example embodiment of Figure 1 applied over a terrain of varying slopes.
  • This synthetic ground cover system 110 has the capacity to handle high-intensity precipitation and avoids erosion of the sand/soil infill ballast and/or the shearing stresses on the turf ranging from 4.88 kg per square metre (1 pound per square foot) to more than 122 kg per square metre (25 pounds per square foot).
  • FIG 6A is a schematic, sectional view of a synthetic ground cover system 610 for erosion control according to an example of the present invention.
  • the ground cover system 610 for erosion control is used to control the erosion of the soil S.
  • the system 610 generally includes a synthetic turf 640 which includes a backing 642 and blades 641 secured to the backing.
  • the backing 642 can be a single ply or a multi-ply backing.
  • An impermeable backing or layer 650 is applied to or formed on the underside of the backing 642 and acts to strengthen both the backing 642 and the connection between the blades 641 and the backing 642.
  • the impermeable layer 650 makes the backing 642 impermeable to water, thus water or other liquids present above the backing 642 are prevented from penetrating the soil S.
  • An infill ballast 660 is applied to the synthetic grass atop the backing and a binding agent is applied to the infill ballast to protect the infill ballast against high velocity water shear forces.
  • the impermeable layer or backing 650 comprises a geotextile.
  • the impermeable layer 650 comprises a permeable geotextile and an impermeable polymer applied to the permeable geotextile to make the layer 650 impermeable.
  • the impermeable polymer comprises Polyethylene, Polypropylene, Polyurethane, EPDM, or PVC.
  • the impermeable polymer is sprayed onto the permeable geotextile and then cured.
  • the impermeable polymer is laminated, glued, coated, or otherwise applied to the permeable geotextile.
  • the impermeable backing 650 is substantially non-flat for gripping the non-level, sloping ground (see Figure 6B ).
  • solid elements may be incorporated with the impermeable polymer to provide for greater gripping ability when placing the ground cover system 610 on non-level, sloping ground.
  • a plurality of solid or pointy jack-like objects are placed on the permeable geotextile and the impermeable polymer is applied to the permeable geotextile, thus affixing the plurality of objects thereto to provide a non-flat impermeable layer 650.
  • the plurality of objects are incorporated within the impermeable polymer and are affixed to the permeable geotextile upon spraying or applying the impermeable polymer on the permeable geotextile.
  • a generally thin grid-like component comprising a plurality of spikes or extruding members is placed atop the permeable geotextile and the impermeable polymer is applied atop the grid-like component, thereby affixing the grid-like component in the impermeable layer 650.
  • the ground cover system 610 can be installed on non- level, sloping ground in a one-step process, which can be seen to reduce manufacturing and installation costs.
  • the cover system reduces construction costs, reduces annual operation and maintenance costs while providing superior and reliable/consistent aesthetics. It also reduces the need for expensive riprap channels and drainage benches, with substantially no erosion or siltation problems, even during severe weather. It is a good choice in sensitive areas where soil erosion and sedimentation are major concerns because soil loss is substantially reduced. It also eliminates the need for siltation ponds and associated environmental construction impacts. It allows for steeper slopes, because there will be a reduced risk of soil stability problems.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Architecture (AREA)
  • Paleontology (AREA)
  • General Engineering & Computer Science (AREA)
  • Cultivation Of Plants (AREA)
  • Road Paving Structures (AREA)
  • Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
  • Catching Or Destruction (AREA)
EP15751994.3A 2014-02-21 2015-02-19 Synthetic ground cover system for erosion control Active EP3102742B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/186,413 US9587364B2 (en) 2011-03-11 2014-02-21 Synthetic ground cover system with impermeable backing and binding infill for erosion control
PCT/US2015/016474 WO2015126996A1 (en) 2014-02-21 2015-02-19 Synthetic ground cover system for erosion control

Publications (3)

Publication Number Publication Date
EP3102742A1 EP3102742A1 (en) 2016-12-14
EP3102742A4 EP3102742A4 (en) 2017-11-08
EP3102742B1 true EP3102742B1 (en) 2022-10-26

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15751994.3A Active EP3102742B1 (en) 2014-02-21 2015-02-19 Synthetic ground cover system for erosion control

Country Status (9)

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EP (1) EP3102742B1 (es)
CA (1) CA2939913C (es)
CL (1) CL2016002100A1 (es)
ES (1) ES2935061T3 (es)
MX (1) MX2016010834A (es)
PE (1) PE20161202A1 (es)
PT (1) PT3102742T (es)
TW (1) TWI593858B (es)
WO (1) WO2015126996A1 (es)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170362780A1 (en) * 2016-03-17 2017-12-21 Bradford H Cooley Ballast System For Roof Protection

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
PT1315866E (pt) * 2000-09-05 2008-07-07 Fieldturf Tarkett Inc Disposição de superfície circundante de pista de aeroporto
US7128497B2 (en) * 2003-12-02 2006-10-31 Daluise Daniel A Horizontally draining artificial turf system
US7682105B2 (en) * 2006-09-14 2010-03-23 Ayers Michael R Cover system for waste sites and environmental closures
ITPD20070123A1 (it) * 2007-04-04 2008-10-05 Unieco Green S P A Metodo per la realizzazione di un campo sportivo in erba artificiale e campo sportivo cosi' ottenuto
US8240959B1 (en) * 2010-05-14 2012-08-14 Turf Services, Inc. Geosynthetic tufted drain barrier
PL2616193T3 (pl) * 2010-09-13 2021-06-28 Watershed Geosynthetics Llc Odporna na wiatr syntetyczna osłonowa
ES2734477T3 (es) * 2011-03-11 2019-12-10 Watershed Geosynthetics Llc Sistema de cobertura de suelo sintético con relleno de unión para control de erosión

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ES2935061T3 (es) 2023-03-01
PT3102742T (pt) 2022-12-27
CL2016002100A1 (es) 2017-04-21
CA2939913A1 (en) 2015-08-27
EP3102742A1 (en) 2016-12-14
CA2939913C (en) 2018-11-06
EP3102742A4 (en) 2017-11-08
TW201540908A (zh) 2015-11-01
WO2015126996A1 (en) 2015-08-27
MX2016010834A (es) 2017-02-09
PE20161202A1 (es) 2016-11-12
TWI593858B (zh) 2017-08-01

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