The invention tidal flat (干 潟 地) or the shore, a vertical water pipe and the horizontal drainage pipe, which is provided construction for dehydration acceleration of the dredged soft ground (2) the moisture-rich, such as swamps, flexible, a tough urethane sheet or a plastic sheet material plurality of tubular drain of the configuration in which cover coupled around the drain hole 12 as the preferred non-woven fabric 6, drainage portion periphery to be installed to communicate with the central drain 11 to the peripheral portion of a tubular cylinder (10) (1 ) as to construction constructed by using a tubular water pipe proposed to be installed relates to a construction method and a tubular drainage pipe for the dehydration promoting dredged soft ground, reducing the manufacturing cost and flexible, the handling and ease of handling in use, by a strong stability easy installation tasks to facilitate dewatering by acting without being able to shorten the construction period, and hang up after construction or modification It will have to boost the economy.
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