Corrugated steel pipe

① Based on laying spiral corrugated steel pipe (6m) and coupling band jointing. ② Includes pipe laying and jointing, cutting, and material unloading work; excludes trench excavation, backfilling, dewatering, surplus soil disposal, and foundation work for the pipeline. ③ Purchase and transport costs of corrugated steel pipe and joint components are excluded.

- Pipe work is applied on the basis that construction is affected by earthwork (excavation and restoration work, etc.); apply by multiplying the following coefficients in consideration of site construction conditions. Classification Standard market unit price Labor cost ratio - Site constructed under the influence of same-day excavation and restoration work - Where continuous excavation is not possible due to traffic restrictions, temporary shoring, obstacles (buried objects, etc.), etc., and excavation, pipe laying, and jointing are repeatedly carried out in parallel 1.00 1.00 - Site constructed under the influence of same-day excavation and restoration work 0.75 1.00 - Where excavation work is separately performed in advance and pipe laying and jointing are carried out continuously - Site constructed without the influence of excavation and restoration work - Where laying and jointing alone are carried out in an open-cut section with preceding work (excavation work or foundation work) completed 0.50 1.00 - When applying 8m (per pipe) corrugated steel pipe, apply by multiplying the following coefficients. Classification Standard market unit price Labor cost ratio 8m(per pipe) 0.77 0.99