Page 139 - Water Standards
P. 139

cementing material strength and masonry surface shall be
                                in accordance with the regulations in Article 2   8   10 of this
                                specificaion.
                           4  The masonry shall be constructed by blocks according to the
                       design requirement. Within the same block, the bricklaying of the
                       dam shall rise up integrally and continuously layer by layer. The level
                       difference between adjacent masonry should be less than 1   5m, and
                       shall be in the shape of steps according to the stone size and the re⁃
                       quirement of staggered joints for upper and lower layers.
                       3   2   2  The surface stones and some structural details shall meet the
                       following requirements:
                           1  The stone⁃laying of the dam surface and insides should rise at
                       the same rate. For conditions with different rates, the rise level differ⁃
                       ence shoule be less than 1   0m, and the joint surface shall be treated
                       as a vertical construction joint. Flaky stone padding under the surface
                       stone is not allowed.
                           2  When rough surface of inside stone should be bonded to con⁃
                       crete.
                           3  If the dam outer surface is a vertical plane, coarse work
                       stone should be used for the surface, and the construction form should
                       be a staggered T⁃shaped. When the dam surface is a downward
                       inclined plane, irregular stones should be used. If the inclined plane
                       can be in the form of steps, coarse work stone can also be used and
                       laid horizontally.
                           4   The head curve and ogee section of the spillway surface
                       should be constructed by irragular stones with high strength⁃grade ce⁃
                       ment mortar. The arch crown of the gallery should be built with vous⁃
                       soirs. If coarse work stones are used, the width of the joints can be
                       adjusted to form the arch.
                           5  For arch dam and multiple arch dam, if coarse work stones
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