Page 215 - Water Standards
P. 215

omitted.
                 8) The relative difference of the two support leg  s height, taken as the distance from
                   the wheel  s working surface to the support leg  s upper flange surface, shall be no
                   larger than 8mm.
               2    Track installation of a small cart/ crab ( or
           mobile trolley) shall meet the following requirements:
                 1) The deviation of the crab track gauge ( as
                   shown in Figure 4   1   10 - 1 ) shall be no
                   larger than ±3mm.
                 2) The relative difference between the crab spans
                   T 1 , T 2 ( as shown in Figure 4   1   10 - 1)
                   shall be less than 3mm.
                 3) The relative difference of the crab track eleva⁃
                   tion (as shown in Figure 4   1   10- 7) in the
                   same cross section shall be less than 3mm.  Figure 4   1   10-5
                 4) The position deviation between the crab track














                                  Figure 4   1   10-6

                   center line and the track beam web center line (Figure 4   1   10-8) shall be less
                   than 0   5δ, where δ is the track beam webplate thickness.
                 5) The crab track  s local bending in the lateral direction shall be no larger than 1mm
                   in any 2m segment length.
                 6) The crab track shall be connected closely with the girder  s upper flange plate. If
                   the local gap is wider than 0   5mm and longer than 200mm, a sub⁃plate shall be
                   added into the gap.
                 7) The crab track joint  s height difference and lateral misalignment shall both be less
                   than 1mm and the gap between joints shall be less than 2mm.
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