Page 141 - Water Standards
P. 141

the dam body stone and concrete shall be constructed in
                                 time.
                       3   2   3  The construction of concrete antiseepage walls shall meet the
                       following requirements:
                           1  The anti⁃seepage of masonry dam can adopt concrete⁃faced
                       plates, concrete core walls, work stone masonry with joints pointing
                       by cement mortar, and geomembrane, etc.
                           2  The concrete anti⁃seepage body shall be embedded into the
                       bedrock in line with the design requirement. The measures of
                       combined light blasting, prying and digging shall be taken for the cut⁃
                       off groove excavation. Rocks over 50cm of the design basic plane shall
                       be pried and dug in order to avoid loosening the bedrock.
                           3  The concrete anti⁃seepage body shall be built after stone⁃lay⁃
                       ing. The height of the anti⁃seepage body shall be a little lower than the
                       stone⁃laying surface.
                           4  The anti⁃seepage body concrete shall meet the design require⁃
                       ments of anti⁃cracking, anti⁃permeability, anti⁃freezing, anti⁃erosion
                       and strength performance. The requirements of concrete construction
                       technology shall comply with the regulations in Section 2   7 of this
                       specification.
                           5   Embedding stones in the concrete anti⁃seepage body is not
                       allowed.
                       3   2   4  The construction of the overflow surface of spillways shall
                       meet the following requirements:
                           1  The strength of stone materials used in the construction of the
                       overflow surface of spillways shall meet design requirements. The re⁃
                       quirements of coarse work stone shall meet regulations in Article
                       2   8   1, and the outside surface should be embellished and processed.
                       The plane difference should be less than 2mm.
                           2  Brickwork shall be laid with alternate joints for upper and
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