Patent Grant
11767648
The present invention relates to a sound barrier comprising a plurality of reinforced sound-absorbing panels mounted within a frame, and methods of making the sound barrier.
The need to reduce sound especially in residential, industrial, or construction areas can be challenging. Noise pollution affects both health and behavior, and can cause hypertension, high stress level, tinnitus, hearing loss, speech interference, damage to psychological health, and other harmful effects to workers and residents in the vicinity. It is thus desirable to minimize, or at least reduce, the amount of sound which is generated.
Various approaches to noise control have included for example, sound blankets, acoustical panels, curtains, baffles, enclosures, fences, and walls constructed of cloth, quilts, vinyl, foam, composites, wood, steel, metal, concrete, cement board, and other materials. However, each has various disadvantages that make widespread production and installation impractical, either due to cost, manufacture or installation complexity. Wood barriers may be lightweight, but are largely ineffective in preventing sound transmission and subject to constant wear from exposure to the environment. Heavy steel and metal barriers are expensive and prone to corrosion. Concrete barriers may also be costly to manufacture, difficult to install, and tend to reflect sounds waves due to being solid. Such barriers may not be aesthetically pleasing or provide limited sound attenuation. Sound attenuation is the combined effect of scattering and absorption that, together, control sound. Scattering is the reflection of sound in directions other than the original direction of propagation of the sound. Absorption is the conversion of sound energy into other forms of energy. Accordingly, there is a need in the art for an improved apparatus and method which mitigate these problems and are capable of providing sound attenuation.
The present invention relates to a sound barrier comprising a plurality of reinforced sound-absorbing panels mounted within a frame, and methods of making the sound barrier.
In one aspect, the present invention comprises a sound barrier comprising:
a plurality of panels, each panel comprising a polymeric material and a plurality of reinforcing inserts encased within the polymeric material; and
a frame comprising a plurality of posts positioned in spaced, parallel relationship and extending vertically upward, and defining inwardly-facing slots for receiving the panels;
wherein the panels are mounted lengthwise with ends within the slots and adjacent panels engage each other by tongues and grooves of lateral surfaces.
In some embodiments, the polymeric material comprises rubber from recycled tires or tire-derived fiber from recycled tires in the form of particulate crumb sized to confer density hardness to the panels.
In some embodiments, the panel has a substantially rectangular shape comprising opposing upper and lower major surfaces textured in the form of a brick-like mosaic or stone pattern; opposing end surfaces configured for insertion into the slots of the posts; a first lateral surface defining a tongue extending along a length of the first lateral surface; and a second lateral surface defining a groove extending along a length of the second lateral surface.
In some embodiments, the reinforcing inserts are oriented to extend between the opposing end surfaces along an entire length or a portion thereof of the panel, each insert being spaced parallel and apart from adjacent inserts.
In some embodiments, the reinforcing inserts are formed of wood or a composite material.
In some embodiments, a plurality of brackets is secured within the slots at bases of the posts for supporting the panels above ground.
In some embodiments, the barrier further comprises a cross-beam received within the slots of the posts and seating against the brackets, the cross-beam being oriented perpendicularly to bases of the posts and extending horizontally between the posts for supporting the panels thereabove.
In some embodiments, the barrier has a density hardness ranging from about 55 to about 63; a sound transmission class ranging between about 29 to about 37; and a noise reduction coefficient of at least 0.30.
In another aspect, the invention comprises a method for producing a sound barrier comprising the steps of:
a) forming a plurality of panels, each panel comprising a polymeric material and a plurality of reinforcing inserts encased within the polymeric material; and
b) forming a frame comprising a plurality of posts defining inwardly-facing slots for receiving the panels.
In some embodiments, each panel is formed by:
i) placing a first portion of a polymeric material and a binder into a mold having a configuration of the panel, wherein the panel has a substantially rectangular shape comprising opposing upper and lower major surfaces textured in the form of a brick-like mosaic or stone pattern; opposing end surfaces configured for insertion into the slots of the posts; a first lateral surface defining a tongue extending along a length of the first lateral surface; and a second lateral surface defining a groove extending along a length of the second lateral surface;
ii) orienting reinforcing inserts to extend between the opposing end surfaces along an entire length or a portion thereof of the panel, each insert being spaced parallel and apart from adjacent inserts;
iii) encasing the reinforcing inserts with a second portion of the polymeric material and the binder;
iv) allowing the binder to cure while subjecting the polymeric material to pressure inside the mold.
In some embodiments, the polymeric material comprises crumb rubber from recycled tires, or tire-derived fiber from recycled tires.
In some embodiments, the binder is selected from polyurea or polyurethane polymer.
In some embodiments, the reinforcing inserts are formed of wood or a composite material.
In some embodiments, the method comprises subjecting the polymeric material to sufficient pressure inside the mold to yield a density hardness ranging from about 55 to about 63.
In some embodiments, the method further comprises securing a plurality of brackets within the slots at bases of the posts for supporting the panels above ground.
In some embodiments, the method further comprises inserting a cross-beam within the slots of the posts and seating the cross-beam against the brackets, the cross-beam being oriented perpendicularly to bases of the posts and extending horizontally between the posts for supporting the panels thereabove.
Exemplary embodiments of the present invention are described with reference to the following drawings. In the drawings, like elements are assigned like reference numerals. The drawings are not necessarily to scale, with the emphasis instead placed upon the principles of the present invention. Additionally, each of the embodiments depicted is but one of a number of possible arrangements utilizing the fundamental concepts of the present invention. The drawings are briefly described as follows:
Before the present invention is described in further detail, it is to be understood that the invention is not limited to the particular embodiments described, as such may, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting, since the scope of the present invention will be limited only by the appended claims.
Where a range of values is provided, it is understood that each intervening value, to the tenth of the unit of the lower limit unless the context clearly dictates otherwise, between the upper and lower limit of that range and any other stated or intervening value in that stated range is encompassed within the invention. The upper and lower limits of these smaller ranges may independently be included in the smaller ranges is also encompassed within the invention, subject to any specifically excluded limit in the stated range. Where the stated range includes one or both of the limits, ranges excluding either or both of those included limits are also included in the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Although any methods and materials similar or equivalent to those described herein can also be used in the practice or testing of the present invention, a limited number of the exemplary methods and materials are described herein.
It must be noted that as used herein and in the appended claims, the singular forms “a”, “an”, and “the” include plural referents unless the context clearly dictates otherwise.
The present invention relates to a sound barrier comprising a plurality of reinforced sound-absorbing panels mounted within a frame, and methods of making the sound barrier.
In one aspect, the present invention comprises a sound barrier comprising:
a plurality of panels, each panel comprising a polymeric material and a plurality of reinforcing inserts encased within the polymeric material; and
a frame comprising a plurality of posts positioned in spaced, parallel relationship and extending vertically upward, and defining inwardly-facing slots for receiving the panels;
wherein the panels are mounted lengthwise with ends within the slots and adjacent panels engage each other by tongues and grooves of lateral surfaces.
In some embodiments, the sound-absorbing panel (12) is comprised of two opposing upper and lower major surfaces (16, 18), two opposing end surfaces (20, 22), a first lateral surface (24), and a second lateral surface (26).
In some embodiments, the sound-absorbing panel (12) comprises reinforcing tongue and groove joints. In some embodiments, the first lateral surface (24) defines a tongue (28) extending along the entire length of the first lateral surface (24), and the second lateral surface (26) defines a groove (30) extending along the entire length of the second lateral surface (26). Provision of tongue and groove joints on the panels (12) facilitates stacking of adjacent panels (12) during installation, provides strength and reinforcement by eliminating or minimizing space between adjacent panels (12), and eliminates or minimizes leakage of noise through adjacent panels (12). The tongue (28) of a first panel (12) receives the grooves (30) of a second panel (12) stacked on top of the first panel (12). The tongue (28) of the second panel (12) receives the grooves (30) of a third panel (12) stacked upon the second panel (12), and so forth.
In some embodiments, the panel (12) may be constructed of a polymeric material. As used herein, the term “polymeric material” includes without limitation rubber materials (whether naturally existing, synthetic or a combination of naturally existing rubber and synthetic). In some embodiments, the polymeric material is rubber sourced from tires (e.g., styrene-butadiene rubber), which rubber is ground into particulate crumb form and may be mixed with secondary materials such as metal and textile fibers (e.g., fibers made of steel, aramid, polyester materials generated from crumb rubber production from tires), that are bound together using suitable binders known in the art, including without limitation, polyurea or polyurethane polymer binders that are cured under pressure. In some embodiments, the polymeric material comprises rubber sourced from tires which is ground into particulate crumb and bound using a polyurethane polymer binder. The particular crumb is typically sized by passing through a screen, with the size based on a dimension (inches) or mesh (holes per inch: 10, 20, etc.). In some embodiments, the size of the particulate crumb is 10.
Without being bound by any theory, rubber in particulate crumb form is highly resistant to environmental conditions and aging, may be obtained at low cost, and may allow sound to be better absorbed within the panel (12), as compared to a solid material from which sound would rebound rather than be absorbed.
In some embodiments, the panel (12) further comprises one or more reinforcing inserts (32) (
In some embodiments, the insert (32) is formed of wood. In some embodiments, the insert (32) is formed of a composite material. In some embodiments, the inserts (32) may be formed of any suitable material known in the art that has sufficient strength and rigidity for use in the panel (12) for a desired application.
Without being bound by any theory, the inserts (32) confer support, stiffness, stability, and lateral strength to the panel (12) in the vertical direction, since a panel (12) formed of rubber alone has less structural strength and may be prone to warping. The spacing apart of the inserts (32) in combination with the use of the polymeric material confers a small amount of flex to the panel (12) if the panel (12) is to be curved, and allows the panel (12) to yield when impacted by an object such as, for example, a vehicle crashing into the sound barrier (1), or to withstand high wind-loads. The inserts (32) may also help absorb sound waves.
The sound barrier (1) is assembled by mounting or stacking individual panels (12) within a frame (34) (
In some embodiments, the posts (36) define inwardly-facing slots (38) extending along the entire length of the posts (36). In some embodiments, the posts (36) define an “H-beam” in cross-section to provide a pair of slots (38). In some embodiments shown in
In some embodiments shown in
In some embodiments, the panels (12) are mounted within the frame (34) using a tongue and groove joint construction in order to facilitate installation manually or without requiring heavy equipment, and to provide strength to the panels (12). In some embodiments, the opposed end surfaces (20, 22) of the panels (12) are profiled so that a tongue-and-groove joint is formed between the opposed end surfaces (20, 22) of the panels (12) and the slots (38) of the posts (36). The opposed end surfaces (20, 22) of the panels (12) are received within the slots (38) by sliding the panels (12) from above into the slots (38). The slots (38) support the panels (12) along the entire end surfaces (20, 22) of the panels (12).
The panels (12) are mounted lengthwise, such that adjacent panels (12) engage with each other by their lateral surfaces (24, 26) (
The panels (12) can be easily removed to allow repair, replacement, or relocation by sliding the panels (12) upwardly from within the slots (38). It will be understood by those skilled in the art that if desired, the panels (12) can be permanently attached to each other by applying adhesives or other materials to the lateral surfaces (24, 26) of adjacent panels (12).
In another aspect, the present invention comprises a method for producing a sound barrier comprising the steps of:
a) forming a plurality of panels, each panel comprising a polymeric material and a plurality of reinforcing inserts encased within the polymeric material; and
b) forming a frame comprising a plurality of posts defining inwardly-facing slots for receiving the panels.
As shown in
The curable binder is then allowed to cure while subjecting the polymeric material to pressure inside the mold to form the panel (12), as a monolithic unit that encases the inserts (32), with the inserts (32) being encased between the upper major surface (16) and the lower major surface (18), namely within the center along the length of the panel (12). In some embodiments, the polymeric material and binder are compressed at a shore hardness ranging from about 55 to about 63. In some embodiments, the polymeric material and binder are compressed at a shore hardness of about 55. This may yield a panel (12) which may allow sound to penetrate the polymeric material and to be captured within the panel (12). One or both of the upper and lower major surfaces (16, 18) may be profiled as smooth or textured surfaces. In some embodiments shown in
The frame (34) can be constructed from any material or combination of materials having suitable properties such as, for example, mechanical strength; rigidity; ability to withstand rusting, warping, cold and adverse outdoor conditions; and ease of machining. In some embodiments, the posts (36) and cross-beam (48) are formed of materials including, but not limited to, wood, metal (such as, for example, aluminum, steel, etc.) and the like. In some embodiments, the selected material is aluminum to avoid rusting or warping. In some embodiments, the posts (36) can be powder coated to match the panels (12). In some embodiments, the “L”-shaped brackets (40) are formed of heavy duty industrial metals including, but not limited to, steel and iron, to confer strength and support the weight of multiple panels (12).
The dimensions are not essential to the invention and may be increased or decreased as may be required to satisfy any particular design objectives; for example, the panels (12) and frame (34) may be available in a variety of dimensions.
Without being bound to any theory, it is believed that the sound barrier (1) exhibits enhanced strength, resiliency, and sound attenuation properties due to the construction of the reinforced sound-absorbing panels (12). When mounted within the frame (34), the panels (12) may effectively absorb sound (meaning less noise pollution) due to the lightly compressed particles of crumb rubber from which it has been formed, but also provide strength and resiliency due to the inserts encased within the panels (12) to protect the sound barrier (1) from various factors such as, for example, adverse environmental conditions or physical impacts from objects such as crashing vehicles. The panels (12) do not fade (i.e., UV protective), crack, peel, rot, or decay, and are fire rated. Any graffiti may be power washed off the panels (12). Further, the sound barrier (1) provides versatility and can be readily assembled due to being lightweight with minimal effort for manual labor or installation hardware such as heavy equipment. The sound barrier (1) is inexpensive to manufacture and is cost effective compared to cedar or concrete privacy walls. The sound barrier (1) protects the environment by recycling materials, particularly rubber sourced from tires, making the sound barrier (1) a durable, long-lasting solution to environmental problems.
The sound barrier (1) of the present invention may be used in a variety of applications including, but not limited to, reducing noise outdoors in highway, residential, commercial, industrial, and construction areas. For example, the sound barrier (1) may be used in high traffic locations, reducing the sound levels by about 40%. The sound barrier (1) may be used to screen off residential areas from sources of noise such as heavy traffic, high speed freeways, construction zones, factories, manufacturing sites, hospitals, airports, railroads, and the like; as an enclosure around patios; as a privacy wall between homes and apartments; and as a security fence or a windbreak. The sound barrier (1) may screen and protect commercial property, allowing shopping centers and institutions to be compatibly located near residential areas; and screen industrial operations from nearby landowners. It will be understood by those skilled in the art that if desired, the sound barrier (1) may be used indoors in offices, sports facilities, schools, shopping malls, etc. to reduce the level of noise.
During development of the invention, the inventors subjected embodiments of the sound barrier (1) to one or more of wind, noise, and fire element analyses (see Examples 1 and 2). The panels (12) of these embodiments were manufactured to differ in size, weight, and density. The test results are set out in Tables 1 and 2 and shown in
As used herein, the term “sound transmission class (STC)” refers to an integer rating which reflects the ability of a sound barrier to attenuate airborne sound. In some embodiments, the sound transmission class of the sound barrier (1) may be about 29. The sound barrier (1) is thus capable of reducing noise by about 29 decibels which is relatively high. In some embodiments, the sound transmission class of the sound barrier (1) may be about 37. In some embodiments, the sound barrier (1) is thus capable of substantially reducing noise by about 29 or about 37 decibels. As used herein, the term “noise reduction coefficient” refers to a logarithmic representation of the decay rate (dB/s) due to a sound barrier with a defined surface area absorbing energy compared to the decay rate in a standard reverberant room without the sound barrier. In some embodiments, the noise reduction coefficient is at least about 0.30, meaning that at least about 30% of the sound energy coming into contact with the sound barrier (1) is absorbed. The sound barrier (1) having a noise reduction coefficient of 0.30 would also be considered 70% reflective. In some embodiments, the noise reduction coefficient of the sound barrier (1) may be at least about 0.40, meaning that about 40% of the sound energy coming into contact with the sound barrier (1) is absorbed. The sound barrier (1) having a noise reduction coefficient of 0.40 would also be considered 60% reflective.
Without being bound by any theory, these unique properties of the sound barrier (1) may be attributed to its structure, namely the panels (12) having reinforcing inserts (32) therein and the density hardness resulting from compression of relatively fine particulate crumb, particularly rubber sourced from tires. The fineness of the particulate crumb may contribute to the absorption of sound.
Embodiments of the present invention are described in the following Examples, which are set forth to aid in the understanding of the invention, and should not be construed to limit in any way the scope of the invention as defined in the claims which follow thereafter.
In a first embodiment of the sound barrier, each panel of the sound barrier was manufactured to have a length of 8 feet, a width of 1 foot, a thickness of 2 inches, and a weight of 60 lbs. These dimensions of the panel allow for less post work to accommodate the 8 feet span. Panels were subjected to wind, noise, and fire element analyses in a laboratory, with the results set out in Table 1 and shown in
During installation at a site, post holes were initially dug into the ground. The posts were set using 8 feet plus ½ inch spacers between adjacent posts. With the panels having a length of 8 feet, the extra ½ inch allows for any expansion that may occur in high temperatures with the polymeric material (e.g., rubber). The post holes were filled with concrete, the posts were centered and levelled, and the cement was left to set. It is suggested to bracket the posts while the cement sets to ensure that the posts stay level. A level line (from the first post to the last post) was plumbed at the lowest level possible, and L-brackets were installed at this lowest line. It is suggested to ensure that this line is level since it is noticeable if it is uneven when the cross-beam (if any) and panels are installed.
The panels were installed (groove on bottom, tongue on top) by sliding the panels from above downwards into the slots of the posts. Once each panel was installed, the subsequent panel was rotated to ensure that the pattern did not run the same as the panel previously installed below. The tongue of the first panel received the grooves of the second panel stacked on top of the first panel. The tongue of the second panel received the grooves of the third panel stacked upon the second panel, and so forth. In this manner, multiple panels were eventually stacked to form a sound barrier section of the desired height. The number of panels needed to form a sound barrier section may be easily calculated by dividing the desired height of the sound barrier wall by the width of each panel (for example, to form a sound barrier section having a final total height of 6 feet and with each panel being 1 foot in width, six panels were stacked). Calculation of the final total height is important in the event that a second level line is also being plumbed at the highest level possible to line up the top of the posts. Otherwise, if the installer has portions of posts sticking up higher than desired, he can simply trim them down to the desired height after the panels have been installed with a skill saw; however, trimming the post tops would remove the powder coating from the top of the posts.
The entire installation process was found to be rapid. There were no screws to fasten and no heavy equipment required, with the exception of a skid steer to move the skids of materials. Since each panel weighed only 60 lbs, a crew of only one or two people were able to lift and set the panels in place within the posts. Once the posts were in place, the installation of a wall formed of sound barrier sections and having a total length of 450 feet was completed by a crew of eight people under an hour (i.e., 55 minutes).
In a second embodiment of the sound barrier, each panel of the sound barrier was manufactured to have a length of 10 feet, a width of 2 feet, a thickness of 3 inches, and a weight of 240 lbs. An acoustic study was conducted to investigate if the panel having a thickness of 3 inches might be sufficient for utilization as a sound barrier, and to compare transmission loss of the panel to common sound barriers constructed from concrete, wood, steel, and other materials. The study was not to concentrate on the actual physical height of the sound barrier, but rather to focus on the ability of the panel to reflect and absorb sound energy. One of the most important parameters of the sound barrier is the transmission loss. When sound is striking a barrier, it will be partially reflected, and also partially absorbed. The remaining sound energy will then be transmitted through. The goal is to minimize or completely remove this transmission component. The results of these analyses are set out in Table 2 and shown in
During installation at a site, post holes were initially dug into the ground. The posts were set using 10 feet plus ½ inch spacers between adjacent posts. With the panels having a length of 10 feet, the extra ½ inch allows for any expansion that may occur in high temperatures with the polymeric material (e.g., rubber). The post holes were filled with concrete, the posts were centered and levelled, and the cement was left to set. It is suggested to bracket the posts while the cement sets to ensure that the posts stay level. A level line (from the first post to the last post) was plumbed at the lowest level possible, and L-brackets were installed at this lowest line. It is suggested to ensure that this line is level since it is noticeable if it is uneven when the cross-beam (if any) and panels are installed.
Each panel was strapped upright on the forks of the lifting device (for example, a forklift, loader, etc.) and lifted until the bottom of the panel reached the top of the post. The panels were installed (groove on bottom, tongue on top) by sliding the panels from above downwards into the slots of the posts. Once each panel was installed, the subsequent panel was rotated to ensure that the pattern did not run the same as the panel previously installed below. The tongue of the first panel received the grooves of the second panel stacked on top of the first panel. The tongue of the second panel received the grooves of the third panel stacked upon the second panel, and so forth. In this manner, multiple panels were eventually stacked to form a sound barrier section of the desired height for the purpose of reducing road noise along a major highway.
The present invention has been described above and shown in the drawings by way of exemplary embodiments and uses, having regard to the accompanying drawings. The exemplary embodiments and uses are intended to be illustrative of the present invention. It is not necessary for a particular feature of a particular embodiment to be used exclusively with that particular exemplary embodiment. Instead, any of the features described above and/or depicted in the drawings can be combined with any of the exemplary embodiments, in addition to or in substitution for any of the other features of those exemplary embodiments. One exemplary embodiment's features are not mutually exclusive to another exemplary embodiment's features. Instead, the scope of this disclosure encompasses any combination of any of the features. Further, it is not necessary for all features of an exemplary embodiment to be used. Instead, any of the features described above can be used, without any other particular feature or features also being used. Accordingly, various changes and modifications can be made to the exemplary embodiments and uses without departing from the scope of the invention as defined in the claims that follow.
This application claims priority to U.S. Provisional Application No. 62/931,592 filed Nov. 6, 2019, the content of which is hereby incorporated by reference in its entirety.
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