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5 Installing the Cabinet on an Underground Base
5.2 Digging a Foundation Pit
NOTICE
Select a site based on the following principles: avoid places with unfavorable soil, such as collapsible loess, frozen soil,
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muddy soil, and quicksand; keep the site far from places such as landfills, backfilled ponds, slopes, retaining walls, and
sewers; preferentially select open, flat, upland areas without risks of natural disasters (such as mountain flood or
collapse).
After a foundation pit is dug, ram the pit bottom flat with tools and ensure that the level difference of the pit bottom is
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within 4 mm.
Compose concrete on site. The recommended mixing ratio is 1 : 2 : 0.4–0.5 (cement weight : sand weight : water weight).
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Lay the concrete on the bottom of the foundation pit. Reducing the ratio of water in the concrete can speed up the
solidification. You can reduce the ratio of water in the concrete under the condition that the concrete can be stirred
thoroughly and evenly to improve the strength of the concrete before and after solidification.
After the concrete is solidified to some extent (no footprint is left after a person stands on the concrete) on the bottom of
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the foundation pit, back fill soil to the pit.
The foundation pit is about 700 mm deep (30 mm difference is allowed).
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Dig a foundation pit whose dimensions (Width x Length x Depth) are 1000 mm x 2000 mm x 700 mm.
Lay 75-mm-deep concrete evenly at the bottom of the foundation pit. The recommended mixing ratio of the
concrete is 1 : 2 : 0.4–0.5 (cement weight : sand weight : water weight).
Unit：mm
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