Page 160 - Water Standards
P. 160
shall be paved uniformly, poured and tamped, and patted
to compaction. After being preliminarily flatted, a layer of
1- 2mm thick cement should be spread on the surface,
and kneaded, pressed and trowelled immediately. Paving
shall be carried out continuously. The mixed material
should be paved within 1 5 hours starting from wet⁃mixing.
4) For paving dry cement soil, the form shall be set up first,
and then material shall be paved and tamped layer by
layer. The paving thickness of each layer should be 10 -
15cm, and layer joints shall be scarified and watered.
5) Plastic cement soil is usually as a protective layer, the
protective layer shall be paved before the initial setting of
the plastic cement.
3 4 6 Stone masonry anti⁃seepage shall meet the following require⁃
ments:
1 Masonry sequence. For trapezoidal open channels, the
channel bottom should be laid before that at channel slopes. For a
channel slope, stones shall be lined starting from the slope toe to up⁃
ward layer by layer. For U⁃shaped and radial open channels, stones
shall be lined starting from the center line of the bottom to both sides
symmetrically. For rectangular open channels, the flank walls may
lined first, then the bottom. For arched and box⁃type closed conduits,
the flank wall and channel bottom may be started first, and then the
top arch or capping plate may be laid. As the bottoms and slopes of
various open channels are lined, the sealing capstones shall be laid in
time.
2 Stone layout provisions. Large and regular stones shall be laid
at the channel bottom and slope toe. The long sides of the stone work
and slabstone shall be laid along the flow direction at the slope, and
perpendicular to the water direction at the channel bottom. Masonry
1 5 3