Expansion Joint Systems
Bridge expansion joint systems are directly exposed to vehicular wheel loads and, therefore, must resist dynamic forces causing fatigue and wear. In addition, these expansion joint systems must remain watertight to protect the bridge superstructure and substructure from corrosion.
In 1960 The D.S. Brown Company began designing and extruding the first generation of Delastic® Preformed Compression Seals. To withstand the demanding requirements of bridge/highway installations, all Delastic® Preformed Compression Seals are extruded from neoprene (polycholoroprene) compounds which satisfy the ASTM standard specification D3542 for Preformed Polychloroprene Elastic Joint Seals for Bridges.
In addition to highway and bridge applications, Delastic® Preformed Compression Seals have also been used in spillways, dams, parking structures, stadium ramps and pedestrian overpasses.
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Steel Plate Expansion Joint Systems, such as finger joint assemblies and sliding plate and armor joint systems, are still specified on many bridge projects due to proven long-term structural performance. These joint systems are also convenient to install on bridge rehabilitation projects requiring a shallow joint depth and/or staged construction.
The D.S. Brown Drainage Trough System is a flexible water drainage system designed for use with open dam expansion joint systems. The D.S. Brown Drainage Trough System acts as part of the bridge drainage system by collecting runoff and channeling it into rigid downspouts, thus protecting the steel structure below from corrosion, waterways from pollution, and/or traffic from falling aggregate and roadway runoff.
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For decades, cast-in-place Steelflex® Strip Seal Expansion Joint Systems have provided superior watertight performance and longevity over bolt-down, segmental and pourable expansion joint systems. Because of this proven performance, Steelflex® Strip Seal Expansion Joint Systems have become the overwhelming choice of owners and specifying engineers around the world for accommodating up to five inches(127mm) of total structural movement.
Steelflex® Rail Profiles
Steelflex® rail profiles are one-piece construction, manufactured using innovative hot rolled/non-machined and hot rolled/machined technology. All proprietary steel rails are available in ASTM A36 or ASTM A588 steel grades.
Because it is field-proven, the Steelflex® SSCM2 rail profile has become widely accepted worldwide as an economical standard in the industry. Other proprietary steel profiles are available to satisfy your specific project needs.
Neoprene Sealing Elements
Selection of a neoprene strip seal sealing element is based on the maximum movement either perpendicular (MRL) or parallel (MRT) to the Steelflex® Strip Seal Joint Assembly.
The preferred joint opening dimensions for sealing element installation is approximately 2.0 inches (51mm). However, the preferred joint opening dimension for A2R-O and L2-O seals is approximately 3.0 inches (76mm).
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The J & JP Series Sealing Systems include an extruded elastomeric profile and a high-strength, two-part epoxy based structural adhesive. The product, when inserted into an expansion joint in a substrate, will seal the opening from the intrusion of water and debris. This unique design allows the seal to function under compression as well as in tension.
The standard J-Series can be used for both bridge and highway as well as parking garage applications, where normal as well as vertical movements are a design parameter. The JP-Series are designed for architectural applications, meeting ADA guidelines and providing a smooth walking surface for pedestrians. In addition to architectural and parking garage projects, the J and JP Series can also be used for bridge applications.
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Since its introduction in 1983, the Delcrete™ Elastomeric Concrete/Strip Seal Expansion Joint System has been utilized on hundreds of bridges worldwide as an alternative to more labor intensive, cast-in-place expansion joint rehabilitation solutions.
Delcrete™ Elastomeric Concrete is a pour-in-place, free-flowing, two-part polyurethane-based elastomeric concrete.
- Excellent bond strength to concrete and steel
- Can accept traffic in one-to-two hours depending on temperature at time of installation
- Non-brittle over extreme temperature ranges
- Resistant to nearly all chemicals
- Permanent, long-term repair solution
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D.S. Brown's NSJ Sponge Joint seals are preformed and made from closed cell neoprene expanded rubber.
NSJ Sponge Joint seals are designed for small movement expansion joint applications such as: small movement bridge expansion joints, perimeter joints around buildings, vertical wall applications and slab-to-wall conditions, exterior columns, elevator shafts and stair towers.
FEATURES/ADVANTAGES:
- Can be used in new construction and/or reseal projects with flexibility around varying joint widths
- Extended performance life
- Ease of installation
- Watertight epoxy adhesive
- Can be combined with D.S. Brown PaveSaver™ Polymeric Concrete Patch or elastomeric concrete headers.
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D.S. Brown Steelflex® Modular Expansion Joint Systems have gained overwhelming worldwide acceptance for accommodating and sealing large joint movements on bridge structures. By incorporating the results of recent research activities, each joint system is designed to provide watertight, fatigue resistant, long-term, maintenance-free performance.
Design Principles
Fatigue Resistant
Modular expansion joint assemblies are subjected to millions of high dynamic stress cycles due to passing vehicle loads. Recognizing the significance of these dynamic loads on the long-term performance of expansion joint systems, D.S. Brown became the first North American company to introduce fatigue-resistant design principles to modular expansion joint assemblies. It is strongly recommended that a specification which includes fatigue design provisions be included in the contract documents.
Watertight Integrity
Each Steelflex® Modular Expansion Joint System not only bridges the joint gap but also protects the structure from premature corrosion. Design of the strip seal sealing element is based on compression of the neoprene seal lug into the gland recess of the centerbeam and edge beam. This mechanically-locked neoprene seal not only provides excellent watertight characteristics but also achieves high pullout resistance.
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The Matrix™ 502 Asphaltic Expansion Joint is a hot applied field molded and constructed expansion joint system that is primarily composed of a uniquely formulated polymer modified asphalt binder that is mixed with specially selected and processed aggregate.
The Matrix™ 502 Asphaltic Expansion Joint can be used for both expansion and fixed end joints at abutments or piers in many bridge types including concrete slab, concrete beam, prestressed concrete and steel beam, either simple or mulitspan, in both new construction and rehabilitation projects.
The Matrix™ 502 Asphaltic Expansion Joint provides a watertight, smooth riding joint that can accommodate up to a maximum of ± 3/4″ (19 mm) of annual joint movement and can be used for expansion joint gaps up to 3″ (75 mm) wide. The joint is installed in cutouts in the deck surfacing ranging from 2 to 6 inches deep (5 to 15 cm) and 20 to 24 inches (51 to 61cm) wide.
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Conventional large movement expansion joint devices are limited to primarily longitudinal movements and/or less than +/- 0.79 inches(20mm) transverse displacement. For joint locations which produce more demanding structural movements, the Maurer Swivel Expansion Joint System by The D.S. Brown Company is provided in the U.S.A. through an exclusive license agreement with Maurer Sohne, Munich, Germany.
Typical Applications Include:
- Long-span structures
- Structures located in seismic zones
- Curved structures
- Structures with differential longitudinal movements(caused by wind, thermal and seismic conditions) or differential vertical movements
- Structures with anticipated substructure settlement
Performance Features
By utilizing a common-to-all centerbeam swiveling support bar, the Maurer Swivel Expansion Joint System is able to accommodate large longitudinal displacements (X), extensive transverse displacements (Y), and vertical displacements (Z), as well as vertical rotations of up to 10 degrees. The centerbeams are free to slide on swiveling support bars, which provide equidistant control for centerbeams without the limitations of typical mechanical control devices.
Seismic Movement Capability
Dynamic tests conducted at the University of California at Berkeley subjected the Maurer Swivel Expansion Joint System by The D.S. Brown Company to high-velocity seismic displacements. This first-of-its-kind test program included velocities of more than 40 inches per second (1015mm/sec) in both longitudinal and transverse directions. The successful test results proved the unique capabilities of this patented device in seismic applications.
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Delastic-LS™ Pourable Bridge Seal is a two-component, self-leveling, fast curing, urethane sealant for use in engineered joints. Typical applications include: control joint and expansion joint systems for bridges, highways, parking structures, stadiums, plazas, water and sewage treatment facilities, and other types of concrete construction.
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V-Seal Expansion Joint Systems use a preformed extruded EPDM seal that can be bonded to concrete, steel, or elastomeric concrete with a quick setting epoxy adhesive.
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