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181:. 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. The ends of the roller beams are supported on base plates and each can be adjusted in height. No leveling or other preparation of the ground is required. Single-span bridges are launched using a centrally mounted launching nose.
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The MGB handrail is designed to provide a significant increase in awareness of roadway width for both military and civilian drivers. It consists of vertical connecting posts with longitudinal hand rails, creating a continuous barrier along the edge of the bridge. Handrail components can be carried on
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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. In both cases, ramp, deck and curb units complete the construction. The heavier duty double-storey configuration is used for heavy loads or
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is its major characteristic. 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)
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MGB Double Storey multi-span bridges usually take the form of two or three span structures rated at MLC 70. 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 requires a total crew of 40 personnel—24 for the
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Two pontoons are coupled back to back to create each pontoon pier. Three such piers make up one landing bay raft. Powered pontoons are driven by a 75 hp (56 kW) diesel engine with a water jet propulsion unit. Fully laden pontoons can operate in currents up to 2.5 m/s (4.9 knots).
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The single-storey 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. This type of bridge is used for short span, that can carry heavy loads. Longer bridges are only able to carry lighter
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The Link
Reinforcement Set (LRS) is constructed when a long, high class type of bridge is required. The LRS deepens the girder and transfers the load throughout the length of the bridge. This type of construction requires a building party of 34 soldiers, and is built on three roller beams.
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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. In this way as many segments as are needed are connected end to end to form a girder of the required length to span the obstruction.
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The Span
Junction Set gives the MGB Double Storey bridge a multi-span capability and allows bridges to be constructed over supports which are either fixed or floating. These may include any combination of existing supports, pontoons, existing or improvised piers and the MGB Portable Pier.
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Single and double storey
Floating MGBs can be built using standard MGB superstructures, carried on MGB Pontoons with single storey hinge bays or double storey Span Junction Sets to provide articulation. The length of these bridges is limited only by the amount of equipment available.
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This is achieved by preassembling MGB components into modules in a separate assembly area or moving them as whole modules of beams and lower panels plus a special junction module to the bridge site . The bridge is then constructed using a suitable crane or CALM vehicle.
277:— There are two types: US and UK ramps. The UK or short ramps are 264 lb (120 kg) and the US or long ramps are 400 lb (180 kg). Each type provides an approach to the bridge, 7 are required at each end. UK ramps are used for single storey only.
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The chains are suspended 2 metres (6 ft 6 in) beneath each bottom chord of the bridge and tensioned after building, by pulling the reinforcing posts into the vertical position. This creates a fully reinforced structure.
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Short/low load bridges can be constructed using just top deck components. Bracing with the additional lower deck dramatically strengthens the bridge allowing heavier loads and longer spans. Single spans can reach 48 metres.
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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.
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MGB can be built in various configurations to provide a full range of bridging capability for use both in the forward battle area and in the communications zone. Speed of erection by the low number of
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Two such longitudinal girders are constructed parallel to each other to provide the bridge's strength. Deck units are then laid between these to form a 4.0 m (13 ft 2 in) wide roadway.
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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.
263:— Used to keep the bridge girders properly spaced and provide connection for the ramp units. It is one of three components that requires at least 6 soldiers to carry; it is 13' 3⁄
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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.
291:" high, weight 163 lb (74 kg) it requires 2 soldiers to carry. This component fills in the gap between girders. Four deck units are required per bay of bridge.
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that can be assembled without help from heavy equipment. In addition, it is also a deck type, two-girder bridging system capable of carrying loads up to and including
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The primary components of the MGB system are rectangular "top deck" segments, and triangular bracing "bottom deck" segments. All segments are man portable.
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The MGB Span
Junction Set consists of span junction posts, which are pinned together at the top and connected at the bottom by hydraulic articulators.
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Capsil Roller Beam of the Medium Girder Bridge. Used as an extension to the construction frame to roll the bridge out over the gap. Kazer River,
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Floating MGBs can be constructed in single or double storey configurations using the same components as the dry bridge configurations:
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in 1971, subsequently also being sold to many other nations, including the
Canadian, Dutch, Danish, Swiss, German and US Militaries.
257:" long, 2'4" wide, 1'6" high, and weight 600 lb (270 kg). It is one component that requires at least 6 soldiers to carry
223:— Used to build the bridge girders. There are 7 panel points on each top panel; it is 6 ft 4 in (1.93 m) long, 2' 1⁄
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Soldiers (299 MRBC) steady the launch nose of a Medium Girder Bridge during erection over the Kazer River, Mosul, Iraq, 2003.
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136:. in Stockport, England, and is still made to this day by its successor WFEL, based on a design by MVEE in Christchurch.
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A view of the sway brace system of a Medium Girder Bridge before the decking is placed. Kazer River, Mosul, Iraq, 2003.
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MACH MGB uses standard MGB components supplemented by special components designed to assist mechanical handling.
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to be built. All except three parts weigh under 200 kg. Most parts can be handled easily by four soldiers.
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Aerial view of the nearly complete erection of a Medium Girder Bridge over the Kazer River, Mosul, Iraq, 2003.
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Single storey construction provides either floating bridges or ferries for load classes up to MLC 60.
243:— Used as a brace for bridge girders. it is 6 ft 5 in (1.96 m) long, 2' 3" wide, 3' 7⁄
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Aerial view of the erection site of a Medium Girder Bridge over the Kazer River, Mosul, Iraq, 2003.
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394:(MLC) from 70 to 60. This prohibits the heavier vehicles in use by the military from crossing.
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297:— Used as a brace between the sloped and level part of a double story bridge. It is 5'⁄
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231:" high (1930 mm × 645 mm × 549 mm), weight 385 lb (175 kg).
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The bridge can still be built by hand if the crane or hydraulics are incapacitated.
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longer spans. The normal building party for double-storey bridges is 25 soldiers.
253:— Used as a bottom brace between the junction panel and bankseat beam. is 13' 2⁄
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The MGB launching nose suspended over the gap. Kazer River, Mosul, Iraq, 2003.
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The advantages of MACH MGB over other purpose-built mechanized systems are:
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548:) attach the link reinforcement set to the underside of the bottom panel
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main bridge, 8 for the MGB Portable Pier and 8 to install anchorages.
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loads. Single-storey bridges can be constructed by 9 to 17 soldiers.
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The bridge can be supported on unprepared and uneven ground without
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Although using an LRS provides a longer bridge span, it lowers the
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The MGB Pontoon is fabricated from marine grade aluminum alloy.
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An M60A3 main battle tank crosses a medium girder bridge during
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271:" wide, and 1’ 6" high and weighs 570 lb (260 kg).
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for another bridge type with mobile military application.
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Up to 31.1 m span with a MLC of 100 wheeled or 70 tracked
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for another bridge type with mobile military application
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212:(DGFVE 232A). This enables a lightweight, high strength
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The MGB parts are fabricated from a specially developed
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A 16-Bay with LRS Medium Girder Bridge across the Kazer
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A fully erected Medium Girder Bridge crosses its first
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Over 500 bridges had been delivered to 40 countries.
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46:but its sources remain unclear because it lacks
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496:MACH MGB is field proven and used worldwide.
374:span with a MLC of 100 wheeled or 70 tracked
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490:Reduced manpower compared to standard MGB.
313:" wide, weight 478 lb (217 kg).
247:" high, weight 435 lb (197 kg).
77:Learn how and when to remove this message
624:over the Kazer River, Mosul, Iraq, 2003.
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487:Any suitably sized crane can be used.
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365:Double storey with link reinforcement
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1104:USMC C-14D06 MGB Student Handout
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506:an MGB palletor unit transport.
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1110:WFEL MGB Technical Information
1099:US Army Field Manual: FM 5-212
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403:2 span double storey up to 51.5
139:MGB was originally sold to the
132:MGB was originally produced by
121:is a lightweight, man-portable
1:
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1077:Mabey Logistic Support Bridge
412:3 span double storey up to 76
147:Configurations and deployment
392:Military Load Classification
342:of 130 wheeled or 85 tracked
7:
1299:Military bridging equipment
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309:" long on the bottom, 2' 1⁄
10:
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949:Republic of China (Taiwan)
119:medium girder bridge (MGB)
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1072:Callender-Hamilton bridge
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338:Up to 9.8 m span with a
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32:This article includes a
1164:Fairey Aviation Company
61:more precise citations.
16:Modular military bridge
1309:British Army equipment
1268:Charles Richard Fairey
194:
134:Fairey Engineering Ltd
114:
102:
1130:at Wikimedia Commons
192:
111:Exercise REFORGER '83
108:
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1252:Medium Girder Bridge
1128:Medium Girder Bridge
1027:United Arab Emirates
305:" long on top, 2' 2⁄
398:Multi-span Bridges
283:— 9'1" long, 1' 5⁄
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158:The segments have
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34:list of references
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1278:Ernest Oscar Tips
1126:Media related to
1082:Military engineer
127:main battle tanks
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251:End taper panel
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38:related reading
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67:September 2010
42:external links
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267:" long, 1' 9⁄
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261:Bankseat beam
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1221:Green Cheese
1171:Subsidiaries
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962:South Africa
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510:Construction
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501:MGB handrail
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432:Floating MGB
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141:British Army
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53:Please help
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1183:Fairey Band
988:South Korea
871:Netherlands
59:introducing
1293:Categories
1193:Acid Brass
1094:References
542:(299 MRBC
370:Up to 49.4
317:Sway brace
287:" wide, 6⁄
1236:Swingfire
1216:Fireflash
1053:Venezuela
975:Singapore
767:Indonesia
650:Australia
281:Deck unit
221:Top panel
207:aluminium
203:magnesium
193:MGB Parts
179:grillages
1209:Missiles
1060:See also
1001:Thailand
936:Portugal
910:Pakistan
540:Soldiers
469:MACH MGB
171:soldiers
1226:Malkara
858:Morocco
793:Ireland
728:Germany
702:Denmark
663:Belgium
622:traffic
129:(MBT).
55:improve
1261:People
1231:Stooge
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1014:Turkey
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842:
829:
816:
806:Israel
803:
790:
777:
764:
751:
741:Greece
738:
725:
712:
699:
686:
676:Canada
673:
660:
647:
214:bridge
205:, and
123:bridge
1107:(PDF)
832:Japan
819:Italy
754:India
715:Egypt
689:Chile
630:Users
525:Mosul
275:Ramps
210:alloy
185:Parts
99:Mosul
95:River
40:, or
897:Oman
780:Iraq
544:USAR
322:Kerb
199:zinc
117:The
340:MLC
235:Bay
1295::
414:m
405:m
372:m
201:,
97:,
44:,
36:,
1156:e
1149:t
1142:v
311:2
307:4
303:2
299:4
289:8
285:4
269:8
265:2
255:8
245:8
229:8
225:8
80:)
74:(
69:)
65:(
51:.
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