Berea piece also known as the Bailey frame, the Bailey beam or truss was first invented by a British engineer during World War II to address the need for rapid bridge erection during the war and was named after him. It can be used for highway bridge, gantry crane, guide beam, bridge erecting machine, hanging basket and so on.
Beret sheet has the characteristics of simple structure, convenient transportation, fast erection, large load, good interchangeability and strong adaptability. Beret sheet can be used for highway Bridges, assembled gantry crane, guide beam, bridge erecting machine, hanging basket, etc. Bailey truss gantry crane, using assembled highway bridge steel components are assembled gantry, but the span and column height is adjustable, so as to adapt to different work place, are widely used in highway, railway, municipal, construction, water conservancy and other construction projects, bridge construction lifting removed prefabricated prefabricated plant such as sewing, beside the bridge piers and girders construction work on site.
The beret piece is welded by upper and lower strings, vertical and oblique rods, and the ends of the upper and lower strings are provided with a Yin and Yang joint, and the joint is provided with a pestle connecting pin hole. Berea piece of channel steel chord by two 10 (back), on the lower chord, how block welding steel plate with circular hole, in strengthening the chord and bottom chord from and double-deck truss connecting bolt hole, within the upper chord and four bolt holes for connecting racks, between the two holes is for double row or more rows of truss with internode connection. The two holes at each end are used to cross the internode. When multiple rows of beret sheets are used as beams or columns, the joint of the upper and lower beret sheets must be reinforced with a support frame.
On the lower chord, is provided with 4 beam gasket plate, above which there is a convex tenon to fix the position of the beam on the plane, and two elliptical holes are provided on the end of the channel steel web of the lower chord rod for connecting the wind resistance rod. The vertical rod of beret sheet is made of 8# I-steel, and there is a square hole on the side of the vertical rod near the lower string rod, which is used for the beam fixture to fix the beam. The material of beret sheet is 16Mn, and each frame weighs 270kg.
"321" steel bridge is assembled highway steel bridge, its biggest characteristics are: lightweight components, convenient disassembly, strong adaptability, with simple tools and manpower can be quickly built. It is suitable for 5 kinds of loads, such as car-10, car-15, car-20, track-50 and trailer -80. The clear width of the carriageway on the bridge deck is 3.7m, which can be combined into multiple span simply-supported girder Bridges in the range of 9m to 63m, and can be constructed as continuous girder Bridges
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