Emergency-Ready Compact 200 Bailey Steel Bridge Price Prefabricated Modern Design

How can the lifting and installation of Bailey steel bridges meet the requirements of bridge construction?

1. During the execution of the suspension and pulling construction, the Bailey frame was manually moved onto the I-beam through a small lantern frame slope, eliminating a process that could not be achieved with a large crane. During the construction, in order to better understand the deformation after concrete pouring, a pre-camber of 4.5cm was adopted. Through specific implementation, the deformation result after concrete pouring was 3cm, meeting the requirements of bridge engineering construction.

2. During the construction, embedded parts for annular columns (with a height of 1.5m, 0.55m higher than the bridge appearance) will be pre-embedded on the bridge pile uprights. Thick steel plates will be welded on the annular columns to install I-beams, and then Bailey trusses will be erected on the I-beams. Each bridge pile upright will have three annular columns with embedded parts. The Bailey trusses will adopt a single-row, double-row, single-sided structural form (a total of four rows of Bailey trusses), with a spacing of 50cm between the first and second rows; a spacing of 3m between the second and third rows; and a spacing of 50cm between the third and fourth rows.

3. Weld compression bars on the Bailey trusses for lifting and pulling, and create a stable service platform underneath. Specifically, use 78 compression bars for each span. To avoid deformation caused by bearing force in the middle, weld compression bars on both sides of the Bailey trusses to the vertical bar of the concealed slab culvert. Moreover, use scissor supports to connect and reinforce the structure between the Bailey trusses.

4. Construction execution process for the lifting and pulling works of steel temporary bridges: Bailey pieces are formed truss structures welded from 10# steel channels. Each piece has a specification of 3m×1.5m and is equipped with male and female connectors on both sides, which are connected using connecting pins during assembly. To enhance the bending stiffness at the connectors, they are reinforced with connecting pieces, which have a specification of 0.5m×1.0m. Both Bailey pieces and connecting pieces have screw holes, and they are fixed in place using screws during assembly. Depending on the required bearing capacity, they can be assembled into various forms such as single and double rows on one side, single and double rows on both sides, single and double rows with two layers, and single and double rows with two layers. The left and right chords of the truss structure pieces can be reinforced with additional chords to meet various load requirements.

The capacity under corresponding compaction refers to the capacity excluding porosity. Except for individual materials such as beret pieces and wired glass that are close to the corresponding compaction, most materials often exhibit some porosity, such as small pieces of materials like bricks and natural marble.

When accurately measuring the density of raw materials with porosity, the raw materials should be ground into fine powder to eliminate their internal porosity. After drying to constant weight, the actual volume can be accurately measured using a density bottle. This volume can be regarded as the volume of the raw materials under the corresponding compaction condition.