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.
2 0 8