SYSTEMS AND METHODS FOR MONOPOLE REINFORCEMENT
According to various embodiments of the present invention, a monopole reinforcement with an elongated base plate and a stiffening cross plate protruding substantially perpendicularly from the elongated base plate, the stiffening cross plate having an inner edge substantially flush with the outer surface of the elongated base plate and an outer edge whose distance from the elongated base plate varies along the length of the stiffening cross plate between a minimum protrusion height and a maximum protrusion height. According to some embodiments, the outer edge is shaped in a wave or sinusoidal pattern to maintain stiffness while decreasing material usage and wind drag, and reinforcement members formed from the base plate and cross plate are interconnectable with other such members for ease of installation.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/593,997, filed on Mar. 2, 2005, and entitled, “Method for Strengthening Monopole Structures Using a Bolt-on System.” The aforementioned application is incorporated by reference herein for all purposes.
BACKGROUND1. Field
Embodiments of the present invention relate generally to the field of reinforcement structures, and more particularly to the field of tower and/or monopole structure reinforcement.
2. Description of Related Art
Prior monopole and/or tower reinforcement systems often employ solutions such as inserting a reinforcing skin or sheath around an existing pole, securing radially-spaced bars, rods, or V-channels to the outside of an existing pole along its length via collars or the like, and/or building reinforcement struts into the material of the existing pole itself. Such solutions often involve highly expensive materials and/or complex installation procedures, and often fail to maximize structural efficiency with a minimal mass of reinforcement material. Such solutions often employ the direct welding of reinforcing apparati directly to an existing pole, which also increases cost and time required for installation. Therefore, there is a need in the art for improved systems and methods for reinforcing existing tower structures, such as existing monopole structures.
BRIEF SUMMARYAccording to various embodiments of the present invention, a monopole reinforcement is provided, including an elongated base plate with an inner surface, an outer surface, and a length which extends substantially along a first direction. The inner surface may be configured to abut a monopole structure, the outer surface is opposite the inner surface, and the elongated base plate may include one or more holes formed therein at one or more intervals along the first direction, the one or more holes configured to receive one or more bolts for attaching the elongated base plate to the monopole structure in a substantially vertical orientation. Embodiments of the monopole reinforcement may further include a stiffening cross plate protruding substantially perpendicularly from the elongated base plate, the stiffening cross plate comprising an inner edge substantially flush with the outer surface of the elongated base plate, the stiffening cross plate further comprising an outer edge whose distance from the elongated base plate varies along the first direction between a minimum protrusion height and a maximum protrusion height.
According to some embodiments of the present invention, the minimum protrusion height occurs at or near the one or more holes, and the maximum protrusion height occurs within the one or more intervals. In some instances of the embodiments, the one or more holes are formed in the elongated base plate along a lengthwise centerline of the elongated base plate, and the stiffening cross plate extends between two of the holes in the base plate. In such instances, the minimum protrusion height may occur near the two holes, and the maximum protrusion height may occur at a midpoint between the two holes. In some cases, the distance between the elongated base plate and the outer edge varies from the minimum protrusion height to the maximum protrusion height to the minimum protrusion height along a bell curve, a parabolic curve, and/or a sinusoidal curve. In other cases, the distance between the elongated base plate and the outer edge varies from the minimum protrusion height to the maximum protrusion height in a linear fashion.
According to some embodiments of the present invention, the stiffening cross plate protrudes continuously from the elongated base plate along a lengthwise centerline of the elongated base plate, and one or more holes are formed in the elongated base plate on alternating sides of the stiffening cross plate at one or more intervals along the first direction, and the distance between the elongated base plate and the outer edge varies continuously between the minimum protrusion height at the one or more holes and the maximum protrusion height at midpoints between the one or more holes. In some cases, the distance between the elongated base plate and the outer edge varies between the minimum protrusion height and the maximum protrusion height along a sinusoidal curve. In other cases, the distance between the elongated base plate and the outer edge varies between the minimum protrusion height and the maximum protrusion height along a pattern such as, for example, a linear pattern, a stepped pattern, or a curved pattern.
In some instances of the embodiments, the elongated base plate and the stiffening cross plate form a first reinforcement member, and the embodiments of monopole reinforcement may further include a splice plate protruding substantially perpendicularly from the outer surface of the elongated base plate near one end of the base plate, the splice plate including a first set of holes formed therethrough. Embodiments of the monopole reinforcement may further include another splice plate including a second set of holes formed therethrough, the second set of holes having a size and placement pattern substantially the same as the first et of holes, so that when bolts are placed through the first set of holes they also fit through the second set of holes to permit bolting of the one splice plate to the other splice plate and to a second reinforcement member for connecting the first reinforcement member to the second reinforcement member.
In other instances of the embodiments, the elongated base plate and the stiffening cross plate form a first reinforcement member, and the stiffening cross plate includes a first set of holes formed therethrough. In such instances, embodiments of the monopole reinforcement may further include a splice plate with a second set of holes formed therethrough, the second set of holes having a size and placement pattern substantially the same as the first set of holes, such that bolts placed through the first set of holes also fit through the second set of holes to permit bolting of the splice plate to the stiffening cross plate and to a second reinforcement member for connecting the first reinforcement member to the second reinforcement member. In yet other embodiments of monopole reinforcement, the elongated base plate and the stiffening cross plate are cut from a single original plate.
According to various embodiments of the present invention, methods for reinforcing an antenna tower structure are set forth. Such embodiments of methods include providing a plurality of reinforcement members, each of which includes an elongated base plate with a first set of holes formed therein at one or more intervals along a length of the elongated base plate, the first set of holes configured to receive one or more bolts for attaching the elongated base plate to the antenna tower structure in a substantially vertical orientation. The plurality of reinforcement members may each further include a stiffening cross plate protruding substantially perpendicularly from the elongated base plate, the stiffening cross plate including an inner edge substantially flush with the elongated base plate and an outer edge whose distance from the elongated base plate varies along the length between a minimum protrusion height and a maximum protrusion height. The plurality of reinforcement members may also include a first splice plate interface member at one end of each of the plurality of reinforcement members, the first splice plate interface member configured for attachment with a splice plate, and a second splice plate interface member at another end of each of the plurality of reinforcement members, the second splice plate interface member configured for attachment with the splice plate. Such embodiments of methods may further include providing the splice plate configured to join successive reinforcement members of the plurality of reinforcement members, affixing a reinforcement member to the antenna tower structure in the substantially vertical orientation, affixing another reinforcement member to the antenna tower structure in vertical alignment with the first reinforcement member, and rigidly connecting the first reinforcement member with the second reinforcement member via the splice plate.
In some cases, the minimum protrusion height occurs at or near one or more of the first set of holes, and the maximum protrusion height occurs within the one or more intervals. In other cases, affixing the first reinforcement member to the antenna structure comprises bolting the first reinforcement member to the antenna structure. According to some alternative embodiments of the present invention, a splice plate interface member is integral with the stiffening cross plate. According to some instances of the embodiments, another splice plate is provided which is configured to join successive reinforcement members of the plurality of reinforcement members, and a stiffener plate may also be provided and embedded within a caisson at a base of the antenna tower structure, either directly or via an anchor bolt. According to such instances of the embodiments, the methods may further include rigidly connecting the stiffener plate with the second reinforcement member via the other splice plate.
In some cases, embodiments of the methods may further include providing an anchor rod for anchoring within the caisson and rigidly connecting the anchor rod to the stiffener plate. In other cases, the stiffening cross plate of the first reinforcement member includes a second set of holes formed therein, and embodiments of the methods may further include providing a first stiffening strip with a third set of holes formed therein, providing a second stiffening strip with a fourth set of holes formed therein, aligning the second set of holes with the third set of holes and with the fourth set of holes, and bolting the stiffening cross plate of the first reinforcement member between the first stiffening strip and the second stiffening strip through the second, third, and fourth sets of holes.
According to various embodiments of the present invention, methods for adding an extension with a new base plate to an existing monopole structure with an existing top plate are provided. According to such embodiments of methods, an extension mount member may be mounted to the monopole structure below the existing top plate, and a new top plate may be provided, where the new top plate has a top plate bracket connector. Such embodiments of methods may further include providing an extension member which includes a top bracket connector and a bottom bracket connector, coupling the bottom bracket connector with the extension mount member, coupling the top bracket connector with the top plate bracket connector, placing the extension onto the new top plate, and securing the new base plate onto the new top plate. Such embodiments of methods may further include forming a first set of holes in the new top plate, forming a second set of holes in the new base plate corresponding to the first set of holes, and securing the new base plate onto the new top plate by bolting the new top plate to the new base plate through the first set of holes and the second set of holes.
According to various embodiments of the present invention, methods for reinforcing an antenna structure are provided, such methods including providing an elongated base plate comprising a first set of pre-drilled holes and preformed slots, attaching a reinforcement member to the antenna structure, attaching a splice plate to the reinforcement member, hanging the elongated base plate from the splice plate, mounting a magnetic drill to the elongated base plate, drilling a second set of holes into the antenna structure through at least one of the first set of pre-drilled holes, stacking onto the elongated base plate a top plate, where the top plate includes a substantially perpendicularly protruding stiffening cross plate. The top plate may further include notches formed therein and a third set of pre-drilled holes, such that the notches overlap the preformed slots and the third set of pre-drilled holes overlap the first set of pre-drilled holes when the top plate is stacked onto the elongated base plate. Embodiments of the methods may further include providing a tabbed connector comprising tabs configured to pass through the notches and fit within the preformed slots, inserting the tabs of the tabbed connector into the preformed slots, attaching the tabbed connector to the top plate, and bolting the top plate and the elongated base plate to the antenna structure through the first and third sets of pre-drilled holes.
This summary provides only a general outline of some embodiments of the present invention. Many other objects, features, advantages and other embodiments of the present invention will become more fully apparent from the following detailed description and the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGSA further understanding of the various embodiments of the present invention may be realized by reference to the figures which are described in remaining portions of the specification.
According to various embodiments of the present invention, systems and methods are described for reinforcing and strengthening existing monopoles by attaching vertical strength plates in-line to transfer stress out of the existing pole shaft and into the new reinforcement strength plates in the overstressed areas. Such a reinforcement process may be adaptable to any tubular structure, such as, for example, round or multi-sided monopoles of eight to eighteen sides, according to embodiments of the present invention. In addition to use for overstressed, fatigued, or otherwise weakened monopoles, embodiments of the present invention may also be used to reinforce existing monopoles in order to support additional antennae or co-sharing, new or additional monopole structure, and/or a heavier load capacity attached thereon. According to embodiments of the present invention, a system for monopole reinforcement which employs sets of vertically-connected interchangeable and adaptable elements allows one continuous stress flow without putting additional stress on the base plate, pole shaft, or existing stiffener plates or anchor bolts. According to some embodiments of the present invention, monopole reinforcement complies with the latest TIA/EIA-222-F tower standard for design and upgrade of communication structures.
As depicted in
Holes 112 in the stiffening cross plate 200 may be used for connecting two subsequent reinforcement members 300 via splice plates 406, for connecting extra reinforcement members to reinforcement member 300 (see discussion of
Stiffening cross plate 560 may include an outer edge 510 and an inner edge 508, and may include holes 512 formed therethrough as well as tabs 511 for insertion into slots 506. Base plate 100 and/or stiffening cross plate 200 may be cut from plates, such as, for example, metal plates, using methods that, based on the disclosure provided herein, are known to those of ordinary skill in the art. For example, base plate 500 and/or stiffening cross plate 560 may be laser cut from metal plates.
As compared with reinforcement member 300, reinforcement member 750 is configured to reinforce lighter monopoles and monopoles which do not need as high a level of reinforcement stiffness. The holes 502 for attaching reinforcement member 750 to monopole 400 are located along the centerline of top surface 514 of base plate 500, and so the tabs 511 of stiffening cross plates 560 may be inserted into slots 506 and welded to base plate 500 in much the same fashion as described above for attaching cross plate 200 to base plate 100. In this way, the stiffening cross plates 560 extend substantially perpendicularly from base plate 500 between holes 502, with the maximum protrusion height 589 occurring in the interval between holes 502 (such as, for example, at the midpoint between two holes 502), and with the minimum protrusion height 588 occurring near the holes 502. Splice plate interface members 550 may also be welded to base plate 500 after tabs 551 have been inserted and plug welded into slots 504. Holes 552 formed through splice plate interface members 550 permit the connection of splice plate 406 to splice plate interface member 550 in order to connect two reinforcement members 750.
Reinforcement member 1500 may also include splice plate interface members 1504 affixed thereto or protruding therefrom. Splice plate interface members 1504 may also include holes 1504 formed therethrough, through which bolts may be used to secure one reinforcement member 1500 to another similar reinforcement member 1550 via one or more splice plates 406.
The front view of base plate blank 1800 depicts the patterns which are cut out to form the cut base plate blank 1900. Once stiffening cross plates 1804 have been cut from base plate blank 1800, tabs 1802 may be inserted in slots 1904 and welded or otherwise secured in place. For example, stiffening cross plates 1804 may be welded to cut base plate 1900 in much the same way that stiffening cross plate 200 is welded to base plate 100. Holes 1902 may also be cut or drilled into base plate blank 1800. Bent down sections 2004 may be bent down as shown in
The embodiment of
In adding the new monopole structure, a set of extension mount members 3500 may be bolted to monopole 400 just below the pre-existing top plate 3210, as shown in
As can be seen from the above description, several elements of various embodiments of the present invention are standard, interchangeable, interconnectable, and/or modular for increased manufacturing and installation efficiency. Embodiments of the invention have now been described in detail for purposes of clarity and understanding. However, it will be appreciated that certain changes and modifications may be practiced within the scope of the appended claims. Thus, although the invention is described with reference to specific embodiments and figures thereof, the embodiments and figures are merely illustrative, and not limiting of the invention. Rather, the scope of the invention is to be determined solely by the appended claims.
Claims
1. A monopole reinforcement comprising:
- an elongated base plate comprising an inner surface, an outer surface, and a length extending substantially along a first direction, the inner surface configured to abut a monopole structure, the outer surface opposite the inner surface, the elongated base plate comprising one or more holes formed therein at one or more intervals along the first direction, the one or more holes configured to receive one or more bolts for attaching the elongated base plate to the monopole structure in a substantially vertical orientation; and
- a stiffening cross plate protruding substantially perpendicularly from the elongated base plate, the stiffening cross plate comprising an inner edge substantially flush with the outer surface of the elongated base plate, the stiffening cross plate further comprising an outer edge whose distance from the elongated base plate varies along the first direction between a minimum protrusion height and a maximum protrusion height.
2. The monopole reinforcement of claim 1, wherein the minimum protrusion height occurs at or near the one or more holes, and the maximum protrusion height occurs within the one or more intervals.
3. The monopole reinforcement of claim 1, wherein the one or more holes are formed in the elongated base plate along a lengthwise centerline of the elongated base plate, wherein the stiffening cross plate extends between two of the one or more holes, wherein the minimum protrusion height occurs near the two of the one or more holes, and wherein the maximum protrusion height occurs at a midpoint between the two of the one or more holes.
4. The monopole reinforcement of claim 3, wherein the distance between the elongated base plate and the outer edge varies from the minimum protrusion height to the maximum protrusion height to the minimum protrusion height along a curve selected from the group consisting of: a bell curve, a parabolic curve, and a sinusoidal curve.
5. The monopole reinforcement of claim 3, wherein the distance between the elongated base plate and the outer edge varies from the minimum protrusion height to the maximum protrusion height in a linear fashion.
6. The monopole reinforcement of claim 1, wherein the stiffening cross plate protrudes continuously from the elongated base plate along a lengthwise centerline of the elongated base plate, wherein the one or more holes are formed in the elongated base plate on alternating sides of the stiffening cross plate at the one or more intervals along the first direction, and wherein the distance between the elongated base plate and the outer edge varies continuously between the minimum protrusion height at the one or more holes and the maximum protrusion height at midpoints between the one or more holes.
7. The monopole reinforcement of claim 6, wherein the distance between the elongated base plate and the outer edge varies between the minimum protrusion height and the maximum protrusion height along a sinusoidal curve.
8. The monopole reinforcement of claim 6, wherein the distance between the elongated base plate and the outer edge varies between the minimum protrusion height and the maximum protrusion height along a pattern selected from the group consisting of: a linear pattern, a stepped pattern, and a curved pattern.
9. The monopole reinforcement of claim 3, wherein the elongated base plate and the stiffening cross plate form a first reinforcement member, the monopole reinforcement further comprising:
- a first splice plate protruding substantially perpendicularly from the outer surface of the elongated base plate near one end of the base plate, the first splice plate comprising a first plurality of holes formed therethrough; and
- a second splice plate comprising a second plurality of holes formed therethrough, the second plurality of holes having a size and placement pattern substantially the same as the first plurality of holes, such that bolts placed through the first plurality of holes also fit through the second plurality of holes to permit bolting of the second splice plate to the first splice plate and to a second reinforcement member for connecting the first reinforcement member to the second reinforcement member.
10. The monopole reinforcement of claim 6, wherein the elongated base plate and the stiffening cross plate form a first reinforcement member, and wherein the stiffening cross plate comprises a first plurality of holes formed therethrough, the monopole reinforcement further comprising:
- a splice plate comprising a second plurality of holes formed therethrough, the second plurality of holes having a size and placement pattern substantially the same as the first plurality of holes, such that bolts placed through the first plurality of holes also fit through the second plurality of holes to permit bolting of the splice plate to the stiffening cross plate and to a second reinforcement member for connecting the first reinforcement member to the second reinforcement member.
11. The monopole reinforcement of claim 1, wherein the elongated base plate and the stiffening cross plate are cut from a single original plate.
12. A method for reinforcing an antenna tower structure, the method comprising:
- providing a plurality of reinforcement members, each of the plurality of reinforcement members comprising: an elongated base plate comprising a first plurality of holes formed therein at one or more intervals along a length of the elongated base plate, the first plurality of holes configured to receive one or more bolts for attaching the elongated base plate to the antenna tower structure in a substantially vertical orientation; a stiffening cross plate protruding substantially perpendicularly from the elongated base plate, the stiffening cross plate comprising an inner edge substantially flush with the elongated base plate, the stiffening cross plate further comprising an outer edge whose distance from the elongated base plate varies along the length between a minimum protrusion height and a maximum protrusion height; a first splice plate interface member at one end of each of the plurality of reinforcement members, the first splice plate interface member configured for attachment with a splice plate; a second splice plate interface member at another end of each of the plurality of reinforcement members, the second splice plate interface member configured for attachment with the splice plate;
- providing the splice plate configured to join successive reinforcement members of the plurality of reinforcement members;
- affixing a first reinforcement member of the plurality of reinforcement members to the antenna tower structure in the substantially vertical orientation;
- affixing a second reinforcement member of the plurality of reinforcement members to the antenna tower structure in vertical alignment with the first reinforcement member; and
- rigidly connecting the first reinforcement member with the second reinforcement member via the splice plate.
13. The method of claim 12, wherein the minimum protrusion height occurs at or near one or more of the first plurality of holes, and wherein the maximum protrusion height occurs within the one or more intervals.
14. The method of claim 12, wherein affixing the first reinforcement member to the antenna structure comprises bolting the first reinforcement member to the antenna structure.
15. The method of claim 11, wherein the first splice plate interface member is integral with the stiffening cross plate.
16. The method of claim 11, wherein the splice plate is a first splice plate, the method further comprising:
- providing a second splice plate configured to join successive reinforcement members of the plurality of reinforcement members;
- providing a stiffener plate embedded within a caisson at a base of the antenna tower structure; and
- rigidly connecting the stiffener plate with the second reinforcement member via the second splice plate.
17. The method of claim 16, further comprising:
- providing an anchor rod for anchoring within the caisson; and
- rigidly connecting the anchor rod to the stiffener plate.
18. The method of claim 12, wherein the stiffening cross plate of the first reinforcement member comprises a second plurality of holes formed therein, the method further comprising:
- providing a first stiffening strip comprising a third plurality of holes formed therein;
- providing a second stiffening strip comprising a fourth plurality of holes formed therein;
- aligning the second plurality of holes with the third plurality of holes and with the fourth plurality of holes; and
- bolting the stiffening cross plate of the first reinforcement member between the first stiffening strip and the second stiffening strip through the second, third, and fourth plurality of holes.
19. A method for adding an extension with a new base plate to an existing monopole structure with an existing top plate, the method comprising:
- mounting an extension mount member to the monopole structure below the existing top plate;
- providing a new top plate comprising a top plate bracket connector;
- providing an extension member, the extension member comprising a top bracket connector and a bottom bracket connector;
- coupling the bottom bracket connector with the extension mount member;
- coupling the top bracket connector with the top plate bracket connector;
- placing the extension onto the new top plate; and
- securing the new base plate onto the new top plate.
20. The method of claim 19, further comprising:
- forming a first set of holes in the new top plate;
- forming a second set of holes in the new base plate corresponding to the first set of holes; and
- securing the new base plate onto the new top plate by bolting the new top plate to the new base plate through the first set of holes and the second set of holes.
21. A method for reinforcing an antenna structure, comprising:
- providing an elongated base plate comprising a first set of pre-drilled holes and preformed slots;
- attaching a reinforcement member to the antenna structure;
- attaching a splice plate to the reinforcement member;
- hanging the elongated base plate from the splice plate;
- mounting a magnetic drill to the elongated base plate;
- drilling a second set of holes into the antenna structure through at least one of the first set of pre-drilled holes;
- stacking onto the elongated base plate a top plate, the top plate comprising a substantially perpendicularly protruding stiffening cross plate, the top plate further comprising notches formed therein and a third set of pre-drilled holes, such that the notches overlap the preformed slots and the third set of pre-drilled holes overlap the first set of pre-drilled holes when the top plate is stacked onto the elongated base plate;
- providing a tabbed connector comprising tabs configured to pass through the notches and fit within the preformed slots;
- inserting the tabs of the tabbed connector into the preformed slots;
- attaching the tabbed connector to the top plate; and
- bolting the top plate and the elongated base plate to the antenna structure through the first and third sets of pre-drilled holes.
Type: Application
Filed: Mar 2, 2006
Publication Date: Sep 7, 2006
Applicant: BCI Wireless LLC (Boulder, CO)
Inventor: Bradley Cook (Boulder, CO)
Application Number: 11/276,507
International Classification: B65D 1/42 (20060101);