Patent Application
20110302856
N/A
Structural members of bridges, tunnels, buildings, and other structures often require protection from various threats to their integrity. These threats can be manmade or natural and may include blasts, including both air blast wave and fragmentation, ballistic projectiles, mechanical cutting, thermal torch cutting, and fire. In some cases, the form of protection from these threats is permanently affixed to the structural member to be protected. In other cases, the form of protection must be substantially removed to allow for inspection of the structural member underneath.
A protection system for a structural element is provided which allows the protection system to be pivoted or otherwise moved away from the structural element to allow for inspection, while remaining attached to the structural element.
In one exemplary embodiment, a protection system includes a shield assembly comprising two parts. The shield assembly is comprised of one or more materials configured to provide protection from a threat. At least one bracket assembly is provided comprising an attachment mechanism, configured for attachment to the structural element, and a hinge mechanism. The shield assembly is hingedly attached to the bracket assembly at the hinge mechanism. The two parts of the shield assembly can thereby be moved away from the structural element while remaining attached to the structural element.
The invention will be more fully understood by reference to the following detailed description when considered in conjunction with the accompanying drawings, in which:
The disclosure of U.S. Provisional Patent Application No. 61/397,105, filed on Jun. 7, 2010, is incorporated by reference herein.
A protection system 10 is provided that wraps about a cable 12, or other structural member, and is hinged to be opened up, thereby allowing the cable underneath to be inspected. The protection system includes a shield assembly 14 and a bracket assembly 18 that attaches the shield assembly to the cable. The protection system is particularly described and shown herein in conjunction with a cable; however, it can be used with other structural members.
The shield assembly 14 is formed in a configuration to fit around the cable 12 or other structural member to be protected. In the embodiment shown in
The bracket assembly 18 attaches to both the underlying cable 12 and to the shield assembly 14. The bracket assembly includes an attachment mechanism 25 that attaches to the underlying cable, and a hinge mechanism 26 that provides the ability to pivot the two parts 22a, 22b away from the cable 12 underneath, thereby allowing the cable to be inspected while the shield assembly remains attached to the cable via the attachment mechanism. Generally two bracket assemblies 18 are used to attach the shield assembly to a cable, one near each end of the shield assembly.
In the embodiment illustrated, the attachment mechanism 25 of each bracket assembly 18 includes a band device 28 that is fastened about the circumference of the cable. The band device is formed in two parts 28a, 28b that are suitably tightened about the cable 12 with two clamp mechanisms 32, 34. For example, each clamp mechanism includes a pair of adjacently disposed blocks 32a, 32b; 34a, 34b. A fastening member, such as bolt or screw (not shown), passes through aligned openings 36, 38 in the blocks to pull the blocks together, as would be understood by one of skill in the art. The band device can also be formed in any configuration to fit the cable, which may have an irregular or asymmetrical configuration, or to fit another structural member.
Referring more particularly to the embodiment of
A removable closure mechanism 62 is provided, for example, at the other end of the band device 42, to hold the shield assembly in a closed position. For example, in the embodiment shown, the other end of each band part 42a, 42b terminates with a flange 64a, 64b having an aperture therethrough. A corresponding aperture 66 is formed in the block 34a, 34b of the other clamp mechanism 34. A fastening element 68, such as a screw or bolt through the apertures, fastens the shield assembly to the cable in the closed position. To open the shield assembly, the fastening element is removed, and the part of the shield assembly is pivoted about the hinge pin into an open position.
The protection system can be provided in sections, each section having any suitable length, arranged serially along the length of the cable. In this manner, any length of cable can be protected. Bumpers 72 for vibration damping can be provided on the band on the shield assembly or on the band attached to the cable.
The shield assembly can incorporate a variety of materials to address the particular threats of concern to a particular cable. For example, the shield assembly can include materials that are resistant to fires, such as hydrocarbon pool and jet fires, abrasive cutting saws, thermal cutting torches, ballistic threats, and blast threats. The materials for the various types of protection are known in the art and can be layered as desired to form the shield assembly. Also, the material for a particular threat can be strategically located where the threat is greatest. For example, blast and ballistic protection can be disposed facing a roadway and need not be wrapped about the entire circumference of the cable, as indicated by the darker shading in
Typically, the materials are arranged in a layered configuration, and are disposed within a skin or shell, which can be formed of a composite or metallic material. For example, within the shell, a hard strike face is provided as an outer layer. The strike face can be formed from a naturally occurring material, such as granite; a ceramic material; or a metallic material, such as steel, aluminum, or titanium. Inwardly of the hard strike face, additional layer(s) can be provided. For example, the layers can include laminates of high strength steel fabrics incorporating thin twisted steel cords, such as that available from HARDWIRE LLC in Maryland. Other materials can include composites such as laminates of ultra high molecular weight polyethylene fibers in a urethane or other resin matrix. Other fibers, such as, aramid, fiberglass, carbon, or KEVLAR® fibers, can be used. Other configurations of materials and types of materials can be used as well.
The protection system can be sealed against environmental infiltration. For example, a sealing material 92 can be disposed beneath the band that clamps about the cable, and a sealing material 96 can be disposed within a clamp mechanism (see
The shield assembly can be formed with a flat walking surface 94, particularly for smaller diameter cables (see
The protection system can be employed on cables having a wide variety of diameters and configurations. Cable diameters typically range from, for example, 1 inch to 50 inches. Greater or lesser diameter cables can also be protected with the present system. In some cases, the cable may have an asymmetric or irregular configuration, and the parts of the shield assembly can be fabricated to accommodate that configuration.
The protection system can be used on a variety of types of cables, such as the main cables and the suspender cables of a suspension bridge and the stay cables of a cable-stayed bridge. The protection system obviates the need for removing the protection system to inspect the cable underneath, a process that typically requires the use of a crane and may require closing the roadway to traffic.
It will be appreciated that the protection system, while described in conjunction with a cable, can be adapted for structural members having other configurations and for other applications. The embodiments and applications of the protection system presented above are illustrative. Other configurations and embodiments are possible; for example, the clamp mechanism can be integrated into the shield assembly. The invention is not to be limited by what has been particularly shown and described, except as indicated by the appended claims.
This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application No. 61/397,105, filed on Jun. 7, 2010, the disclosure of which is incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| 61397105 | Jun 2010 | US |
