What to pay attention to during the hoisting construction of the Bailey Bridge steel temporary bridge?

How to Meet Bridge Construction Standards for the Hoisting of a Bailey Bridge Steel Temporary Bridge?

The execution of the hoisting and pulling construction project has utilized bamboo scaffolding to manually move the slanting slope to the I-beam, bypassing the process that cannot be achieved by large cranes. During the construction, a pre-curved height of 4.5cm was adopted to better define the deformation after the concrete pouring. After the concrete pouring, the resulting deformation was 3cm, meeting the specifications for bridge construction projects.

During the construction of the engineering, a pre-buried annular column (1.5 meters high, 0.55 meters above the newly renovated bridge appearance) was installed on the bridge pile vertical rods. A thick steel plate was then welded to the annular column, with an I-beam installed on top. A Bailey truss structure was constructed using the I-beams, with three annular columns pre-buried on each bridge pile vertical rod. The Bailey frames were designed with a single and double-row single-sided structure (total of four rows of Bailey truss structures), with a spacing of 50cm between the first and second rows; 3 meters between the second and third rows; and 50cm between the third and fourth rows.

3. Welded tensile ribs on the Bailey plank, creating a stable service platform below, with each span using 78 tension ribs. To avoid misalignment due to deformation under intermediate loads, tensile ribs on both sides of the Bailey frame are electrically welded to the hidden board's column reinforcement, and a shear support point connection structure is used to reinforce the frame-to-frame joints.

4. Construction Execution Process of Steel Bridge Crane Hoisting: The Bailey truss is formed by welding 10# angle steel into a prefabricated truss structure, each piece measuring 3m x 1.5m, with male and female joints on both sides for assembly. The assembly requires pin connections. To enhance the bending stiffness at the joints, reinforcing plates measuring 0.5m x 1.0m are used. Both the Bailey truss and reinforcing plates have screw holes, and they are securely fastened together using screws during assembly. Depending on the required load-bearing capacity, they can be assembled in various configurations such as single/dual row single-sided, single/dual row double-sided, single/dual row two-layer, and more. The chord rods of the truss structure can be reinforced with additional rods to accommodate different types of loads.

The capacity at a given degree of compaction refers to the volume excluding porosity. Apart from a few exceptions such as corrugated iron sheets and wired glass that are close to the corresponding compaction degree, the majority of materials often exhibit some porosity, such as bricks and small pieces of natural marble.

When measuring the density of porous raw materials, the raw material should be milled into a fine powder to eliminate its internal porosity. After drying to a constant weight, the actual volume is measured using a density bottle. This volume can be considered as the capacity of the raw material under its corresponding compaction condition.