Page 159 - Water Standards
P. 159
Table 3 4 4-2 (Continue)
Item Allowable deviation value (mm)
Longitudinal blocking length of slope and bottom
± (5-10) ± (5-10)
at in⁃situ poured anti⁃seepage structures
Transversal blocking length of slope and bottom
+ (30-50) + (10-60)
at in⁃situ poured anti⁃seepage structures
Length difference between two diagonal
±7 —
lines of precast slabs
In⁃situ placement ±5% -5%--15%
Thickness of anti⁃
Stone masonry and
seepage structure ± (5%-10%) —
precast blocks
Note: The larger values are applicable for large and medium⁃sized channels, and the
smaller values for small ones.
3 4 5 Cement soil anti⁃seepage shall meet the following require⁃
ments:
1 Soil shall be air dried and pulverized, and passed through a
5mm aperture sieve. Measures against rain and humidity shall be taken
to protect the cement.
2 In⁃situ paving of cement soil anti⁃seepage structures shall be
carried out according to the following steps:
1) Batching shall be carried out according to the design mix
proportion, and the allowable deviation in weight shall
meet relevant requirements. The time for mixing and pav⁃
ing, or mold packing and forming of the cement soil shall
not be larger than 60min.
2) Cement soil should be dry⁃mixed first, and then wet⁃
mixed to uniformity.
3 ) Before plastic cement soil is paved, the channel
foundation shall be wetted by purling water, and an ex⁃
pansion joint form shall be set up. Channel slopes shall be
paved before the channel bottom. Cement soil material
1 5 2