Kuoppa pumpattu tyhjäksi

Kuopan pohjalle tulee suodatinkangas savipintaa vastaan. Itse asiassa sinne tulee kaksikin suodatinkangaskerrosta päällekkäin, ja ne laitetaan 90-asteen kulmassa ristiin. Tällä yritetään välttää se, että paalutuskone uppoaisi saveen suodatinkankaiden saumakohdasta. Jos niin kävisi – sitten kuopan pohja olisi ”sekametelisoppaa”, jossa on hujan hajan sekaisin sekä savi, kapillaarikatkosepeli että suodatinkankaan rämmäleet. Silloin pohja olisi pilalla.

Näinkin on joskus jossain työmaalla käynyt, ja tästä paalumies ja kaivurimies varoittivat jo etukäteen. Mutta kun suodatinkankaasta valitsee sitä leveämpää mallia (siis 5 metriä leveää), ja niitä kun laittaa kaksi kerrosta eri suuntiin, niin kuopan pohjan pitäisi kestää, vaikka savi on tällä kertaa erittäin pehmeää. Ennen suodatinkankaan asentamista pumppasin tänään kuopasta vedet pois. Tässä muutamia kuvia siitä. Ehkä puolisen kuutiota oli vettä kertynyt kuoppaan, eli aika vähän – ottaen huomioon, että oli näin sateinen ja nihkeä kesä.


Pumppu ämpärissä, jossa reiät kyljessä.


Nostonaru, letku ja sähköjohto kuopan reunalla.


Vesiletkun pää rajaojassa.

290 vastausta artikkeliin ”Kuoppa pumpattu tyhjäksi

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