Page 131 - Water Standards
P. 131

concrete. When the foundation is a clay toothed groove,
                                geomembranes shall be folded zigzag like “ ”, and shall
                                be tamped manually layer by layer.
                             3) For the connection between geomembranes and the bank
                                slope, geomembranes can be embedded in concrete key⁃
                                walls or by inserted into the impervious rock foundation in
                                case of no design requirements.
                           5    Protection layer: when geomembranes are used for anti⁃
                       seepage on sloping walls, a protective layer shall be laid on the fin⁃
                       ished geomembranes.
                             1) The soil protection layer shall be laid from bottom to top.
                                The thickness and density of the layer shall be constructed
                                according to design requirements.
                             2) If the protective layer consists of hard material, such as
                                concrete, flagstone and dimension stone, the foundation
                                shall be treated carefully to control the deformation, and
                                prevent the geomembranes from sliding and causing tearing
                                cracks. Furthermore, the peripheral laying and pressure
                                on the top part shall be coordinated during construction to
                                ensure the completeness of the laying work. If the
                                protective layer is made by shoting concrete, consistent
                                concrete thickness shall be ensured.
                           6  The construction quality inspection shall comply with the fol⁃
                       lowing requirements:
                             1) Set up quality inspection regulations. Raw materials, ma⁃
                                terials tests, preparation and use of binder, joints,
                                planeness of laid surface, and peripheral connections shall
                                be inspected regularly and controlled by specially assigned
                                workers.
                             2) Appearance inspection shall be done each time the soil fill⁃
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