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Berets can be used for highway bridges, assembling gantry cranes, guide beams, bridge erecting machines, hanging baskets, etc The Bailey truss combination gantry crane adopts prefabricated highway steel bridge components to assemble the gantry frame, and its span and column height can be adjusted to adapt to different work sites. It is widely used in construction projects such as highways, railways, municipal engineering, construction, water conservancy, bridge construction prefabrication yards for lifting and moving prefabricated components, bridge pier side transportation of large beams and other on-site construction operations.
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There are two specifications of imported and domestically produced Beilei beams. The truss joints of domestically produced Beilei beams are made of 16 manganese steel, the pins are made of chromium manganese titanium steel, the pins are made of spring steel, the welding rods are T505X type, and the bridge deck and wheel guards are made of pine or fir wood. The allowable stress of the material shall be increased by 30% based on the basic stress. When individual steel members exceed the above regulations, they shall not exceed 85% of their yield point. The allowable stress used in the design is as follows: wood - bending stress, compressive stress, and compressive stress along the wood grain are 16.2MPa; The shear stress along the wood grain during bending is 2.7 MPa. The elastic modulus is 98.5 × 105MPa. Steel material - the tensile stress, compressive stress, and bending stress of 16 manganese steel are 1.3 × 210=273 MPa; The shear stress is 1.3 × 160=208 MPa. The tensile stress, compressive stress, and bending stress of 30 chromium manganese titanium are 0.85 × 1300=1105 MPa; The shear stress is 0.45 × 1300=585 MPa. The existing imported Bailey beams are mostly products from the 1940s, with a material yield point strength of 351 MPa and an allowable stress of 0.7 × 351=245 MPa. The allowable stress of the pins can be considered to be the same as that of domestic pins.
