【明治用水頭首工】SK1300DLC 大型機撤収作業 上流側ディープウェル工法(湧水対策)

[@timothystegner7680]

ah, so it appears the deep cores are really dewatering wells, with big pipes on them... similar to dewatering efforts needed to -build- a dam to begin with, with the sheet piles around the periphery acting as the primary cofferdam...

[@user-yv8jt4eg7jChalenisi]

寒い中ご苦労様です。湧き水対策順調みたいですね。

[@mr.tokaikun]

ありがとうございます 順調に進んでるように見えます

[@hehehe3591]

地下水を抜くと聞くと地下水位低下によるなんたらーーーという問題を思い出しますが、矢板で仕切っているのですかねえ。よく分からないけど・・・

[@timothystegner7680]

If you look back in the archives, you'll see the original problem here is that water is flowing -under- the dam in this section. All the work to this point has been to try to mitigate that flow, through a series of pilings and concrete 'plugs'. Basically, the first two tries haven't worked sufficiently, so they're trying it again. This time, they appear to be removing the entire weir, likely to get better access to the areas allowing the water to flow beneath.