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