The two span bridge can have an overall length of up to 51.5 metres (169 ft), while the three span can be 76 metres (250 ft). This enables a lightweight, high strength bridge to be built. For medium span highway bridges, composite box girders offer an attractive form of construction. Preface. Double storey construction allows landing bay spans up to 26.5 metres (86 ft 11 in) and is suitable for conditions where there is considerable rise and fall in water levels. The heavier duty double-storey configuration is used for heavy loads or longer spans. Kazer River, Mosul, Iraq, 2003. 775 Views 2 Comment. 25 files | 94.5 MB | 5368 views. The bridge is then constructed using a suitable crane or CALM vehicle. Fully laden pontoons can operate in currents up to 2.5 m/s (4.9 knots). In operation since 1971, when it set new standards for military bridging, today over 500 Medium Girder Bridge (MGB) systems have been purchased by armed forces worldwide, notably the UK, USA and other NATO allies. The Medium Girder Bridge is modular, lightweight, and can be assembled in a short period of time. Major Parts. Depending on the span required, several different types of bridges are in common use today. Transoms rest on the lower chord of the panels, and clamps hold them together. The normal building party for double-storey bridges is 25 soldiers. (U.S. Marine Corps photo by Cpl. Kazer River, Mosul, Iraq, 2003. The MGB Link Reinforcement Set (LRS) consists of reinforcing links which are 3.66 metres (12 ft) long, plus short links of 1.82 metres (6 ft), which are pinned together to form chains under each girder. English: The Medium Girder Bridge (MGB) is a lightweight, man portable bridge and can be assembled without help from heavy equipment. In operation since 1971, when it set new standards for military bridging, today over 500 Medium Girder Bridge (MGB) systems have been purchased by armed forces worldwide, notably the UK, USA and other NATO allies. No leveling or other preparation of the ground is required. Box Girder Bridge is a bridge where the key beams consist of girders shaped like a hollow box. Medium-girder-bridge 3D models ready to view, buy, and download for free. The segments have knuckle joints at each end; assembly consists of simply engaging the knuckle joints of adjacent segments then inserting a pin through a hole down the length of the knuckle. The segment… Short/low load bridges can be constructed using just top deck components. Girder Bridge Parts 1-8 3D printable. 4.2 Shallow deck-type bridges 34 4.3 Half through plate girder bridges 36 4.4 Standard box girder bridges 42 4.5 Slab-on-beam composite girder bridges 44 4.6 Truss girder bridges 45 4.7 Direct fastening construction 46 4.8 Integral construction 47 5 DESIGN STANDARDS 49 5.1 HMRI principles and guidance 49 The components can be easily transported by bridging trucks, trailers, or by helicopter. An ‘overbridge’ is a method of reinforcing an existing bridge that might have been damaged or simply not have the required carrying capacity, covering craters or reinforcing culverts for example. The MGB parts are fabricated from a specially developed zinc, magnesium, and aluminium alloy (DGFVE 232A). These may include any combination of existing supports, pontoons, existing or improvised piers and the MGB Portable Pier. Army DA administrative publications and forms by the Army Publishing Directorate APD. Two such longitudinal girders are constructed parallel to each other to provide the bridge's strength. In addition, it is also a deck type, two-girder bridging system capable of carrying loads up to and including Main battle tanks (MBT). Bailey bridge for another bridge type with mobile military application. Please improve this article by adding a reference. Design and construction techniques already popular and common for the I-beam form of composite bridges can be utilised to produce box girder structures of clean appearance whilst maintaining relative simplicity and speedy construction procedures. It consists of vertical connecting posts with longitudinal hand rails, creating a continuous barrier along the edge of the bridge. Download Images of Medium girder bridge - Free for commercial use, no attribution required. Most parts can be handled easily by four soldiers. Single-span bridges are launched using a centrally mounted launching nose. Adam Dublinske) Over 500 bridges had been delivered to 38 countries.[3]. The MGB also requires very little maintenance once erected, is air transportable in either standard palletised loads or in partially assembled bridge configurations, and all US components will fit MGBs in use by allies (except for the launching nose cross girder posts). The Span Junction Set gives the MGB Double Story bridge a multi-span capability and allows bridges to be constructed over supports which are either fixed or floating. Powered pontoons are driven by a 75 hp (56 kW) diesel engine with a water jet propulsion unit. All segments are man portable. This article does not contain any citations or references. The single story MGB bridge is constructed using top panels which are pinned together to form two girders and joined at each end by a bank seat beam creating a rigid framework. Handrail components can be carried on an MGB palletor unit transport. In both cases, ramp, deck and curb units complete the construction. Single-storey bridges can be constructed by 9 to 17 soldiers. DISTRIBUTION STATEMENT A: Approved for public release; distribution is unlimited. Bracing with the additional lower deck dramatically strengthens the bridge allowing heavier loads and longer spans. Suspension bridges become economic at spans above 500m, with the lar… Deck units are then laid between these to form a 4.0 m (13 ft 2 in) wide roadway. Speed of … In the double storey MGB bridge, the girders consist of top and bottom panels, with junction panels and end taper panels forming the sloping end of the bridge. This requires a total crew of 40 personnel—24 for the main bridge, 8 for the MGB Portable Pier and 8 to install anchorages. MGB Design. WFEL's Double Storey Medium Girder Bridge. Hello, I hope You enjoy to examin this 3D printable Medium Girder Bridge. These are included in our issued set of Prestressed Concrete I-Girder standards.See MISCELLANEOUS STANDARDS section in the list for all additional standard drawings required. Media in category "Medium Girder Bridge" The following 69 files are in this category, out of 69 total. MGB units are light, easily transported and can be adapted for most tactical bridging requirements. The Medium Girder Bridge is a classic piece of engineering. Capsil Roller Beam of the Medium Girder Bridge. The MGB is constantly in use, and increasingly in demand, for both military and disaster relief operations. MACH MGB (Mechanically Aided Construction by Hand) is a semi-mechanized bridge building system, which reduces the size of construction crews from 25 to 9, for similar build times. The primary components of the MGB system are rectangular "top deck" segments, and triangular bracing "bottom deck" segments. Different bridge lengths are created by varying the number of bays used to suit the gap being crossed. A 16-Bay with LRS Medium Girder Bridge across the Kazer River, Mosul, Iraq, 2003. Component Lists. Please improve this article by adding a reference. Single spans can reach 48 metres. Significantly developed from its initial design to its multi-role capability of today, component interchangeability across any bridge of any age has been maintained. MACH MGB is field proven and used worldwide. The Medium Girder Bridge is a classic piece of engineering. Soldiers (299 MRBC) steady the launch nose of a Medium Girder Bridge during erection over the Kazer River, Mosul, Iraq, 2003. Generally, short bridges (less than 100m span) are achievable via a concrete or steel beam construction. It is constructed on one roller beam for single-story construction; two roller beams, 4.6 m apart, for double-story construction; and on three roller beams when constructing a double-story bridge over 12 bays long. Short/low load bridges can be constructed using just top deck components. The ends of the roller beams are supported on base plates and each can be adjusted in height. The bridge can be supported on unprepared and uneven ground without grillages. Box girders comprise structural steel, pre-stressed concrete, reinforced concrete or composite of steel. Speed of erection by the low number of soldiers is its major characteristic. 16 Bay With Link 4.jpg 1,184 × 589; 287 KB U.S. Marines with Bridge Company, 7th Engineer Support Battalion, 1st Marine Logistics Group, set up a medium girder bridge at Camp Pendleton Calif., Feb. 16, 2018. Decisions on the basic geometry of the girders (I-girders and Tub Girders) as well as the bracing details play a major role in the efficiency of the system. The MGB launching nose suspended over the gap. Allocation/Capabilities. Disadvantages of the MGB/LRS. MACH MGB uses standard MGB components supplemented by special components designed to assist mechanical handling. *FREE* shipping on qualifying offers. From 100m to 300m spans, truss or arch bridges become most economic, although segmental concrete types are still common. Kazer River, Mosul, Iraq, 2003. All segments are man portable. medium-girder-bridge. No results. Used as an extenstion to the construction frame to roll the bridge out over the gap. Each bay is 1.83 metres (6ft) in length; a step change in gap crossing capability being achieved as each bay's configuration is changed from Single Storey to Double Storey and then to Double Storey with a link reinforcement. The bridge can still be built by hand if the crane or hydraulics are incapacitated. This creates a fully reinforced structure. The MGB Pontoon is fabricated from marine grade aluminum alloy. Aerial view of the nearly complete erection of a Medium Girder Bridge over the Kazer River, Mosul, Iraq, 2003. MGB was originally sold to the British Army in 1971, subsequently also being sold to many other nations, including the Dutch, Swiss and US Militaries. The floor of the bridge consists of a number of 19-foot-wide (5.8 m) transoms that run across the bridge, with 10-foot-long (3.0 m) stringers running between them on the bottom, forming a square. Bracing with the additional lower deck dramatically strengthens the bridge allowing heavier loads and longer spans. In addition, it is also a deck type, two-girder bridging system capable of carrying loads up to and including main battle tanks. WFEL's Double Storey Medium Girder Bridge. For information about how to add references, see, Articles incorporating text from Wikipedia, https://military.wikia.org/wiki/Medium_Girder_Bridge?oldid=4178805. The economy and efficiency of steel girder systems are significantly impacted by the ease of fabrication, erection, construction, and as well as in-service behavior. A single storey MGB bridge is constructed using top panels pinned together to form two girders and joined at each end by a bankseat beam, creating a rigid framework. Advantages of the MGB/LRS. Savona Equipment will buy, sell and consign your new or used steel bridges. Single spans can reach 48 metres. The 20 Seabees partnered with 32 Marines for the week-long exercise to construct a five-bay Improved Ribbon Bridge (IRB) and an eight-bay double story and six-bay single story Medium Girder Bridge (MGB) to demonstrate NMCB capabilities and improve interoperability with their Marine counterparts. In operation since 1971, over 500 MGB systems have been acquired by 40 armed forces worldwide. The Link Reinforcement Set (LRS) is constructed when a long, high class type of bridge is required. MGB was originally produced by Fairey Engineering Ltd., in Stockport England and is still made to this day by its successor WFEL based on a design by MVEE in Christchurch. Single storey construction provides either floating bridges or ferries for load classes up to MLC 60. Chapter 1 - Medium Girder Bridge Components. Off-System 24-Ft Rdwy Bridge Standards Available for download Prestressed I-Girder standards are available for structures with Type Tx28 thru Tx62 girders. 2 span double storey up to 51.5 m with a MLC of 70, 3 span double storey up to 76 m with a MLC of 70. In addition, it is also a deck type, two-girder bridging system capable of carrying loads up to and including Main battle tanks (MBT). All except three parts weigh under 200 kg. 10.1-A6-3 Bridge Mounted Sign Bracket Details 1 of 3 (pdf 116 kb) (dwg 123 kb) 10.1-A6-4 Bridge Mounted Sign Bracket Details 2 of 3 (pdf 109 kb) 10.1-A6-4b Bridge Mounted Sign Bracket Details 2 of 3 10.1-A6-4c Bridge Mounted Sign Bracket Details 2 of 3 The MGB meets the evolving needs for bridging equipment across a wide spectrum of requirements, from short irrigation channels, through ravines to large expanses of water.
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