CSS (Corrugated Steel Structure)

The main problems of the “ASTM A796M Table 33 Pitch 150mm Depth 50mm CSS" used mainly in small structures such as road culverts and underpass are 1) deformation of the section exceeding the deformation standard (allowable displacement 5%, AASHTO) 2) local buckling failure 3) tear of bolt joint steel plate 4) Leakage of Channel connection 5) Deformation of the end treatment (Bevel, Step bevel type). We provide the technical ability to compensate for the above trouble (allowable displacement of 2%) "ASTM A796M Table 35 Pitch 380mm Depth 140mm CSS and ASTM A796M Table 37 Pitch 500mm Depth 237mm CSS: EXSCor” which moment of inertia increased by 8 ~ 9 times.

Besides, as a behavior the vertical cracking and activity of foundation concrete, which has been a problem in a concrete foundation, the foundation was changed from a retaining wall type to a block type. The total weight of the structure was lightened to solve the problem of uneven settlement. For the occurrence of leakage at the connection channel part, a leakage prevention method was installed at the upper part of the foundation to prevent condensation and inflow water from outside flowing.

If there is enough height in the soil from the top of the CSS to the planned height during the section selection, applied the arch shape section with good openness. The box shape section if there is not enough top of the cover of height. Simplify the economical process (3 steps ➞ 2 steps) to reduce the construction period by 30% and reduce the construction cost by more than 15%.