Page 190 - Water Standards
P. 190

ical method, numerical method or by form enlargement.
                           4  Collision and deformation shall be avoided in form transporta⁃
                       tion, and reinforcement measures shall be taken if the form size is
                       large.
                           5  The installation of the form for the concial body of the spiral
                       case shall be done after the installation of the stay ring, and the upper
                       opening of the form must be closely connected to the lower part of the
                       vertebral body.
                           6  When the form is in position, the corresponding precision
                       with the horizontal and vertical axis of the generator unit as well as the
                       installation elevation shall be rechecked, and the installation error
                       shall not be larger than the requirements in Table 3   9   5-1.
                           7  Form removal shall meet the requirements in Article 2   7   6 of
                       this specification.
                       3   9   6  Concrete construction of lower parts shall meet the following
                       requirements:
                           1    Concrete construction of lower parts shall mainly be
                       determined by concrete⁃pouring, and coordinated with electromechan⁃
                       ical installation. Upper parts construction shall be determined by elec⁃
                       tromechanical installation and concrete⁃pouring is a secondary consid⁃
                       eration.

                              Table 3   9   5-1  Allowable form installation deviation of
                                         spiral case and tailwater tube  Unit: mm

                        No.              Item               Spiral case  Tailwater pipe
                         1     Elevation difference of adjacent slabs  3   3
                         2           Local unevenness          5           5
                         3           Axis diaplacement        ±5          ±5
                         4            Form elevation          ±5          ±5
                         5             Section size           ±10         ±10
                         6           Embedded parts                        5
                         7     Size and position of preformed holes  5    10
                        Note: Spiral case internal size means the size in the radial direction.


                                                                            1 8 3
   185   186   187   188   189   190   191   192   193   194   195