4.4.5. Editing of a beam of the back bridge


Fig. 4-58. Scheme of editing of a beam of the back bridge: 1 — a hydraulic cylinder; 2 — clamping a traverse; 3 — a flange of A.70172; 4 — a square; 5 — a table of a press; 6 — an emphasis; 7 — an indicator rack

Attach to each end of a beam the flanges of A.70172 (used when editing, but not when checking beams) and establish it on support of a hydraulic press so that the ends clamping traverses of 2 (fig. 4-58) were in a zone of deformation of a beam. The most probable arrangement of a zone of deformation at distance of 200-300 mm from end faces of flanges of a beam.
Establish a rack 7 with the indicator so that the leg of the indicator rested against the top part of a side surface of a flange, and the arrow of the indicator stood on the division equal to the size of deformation of the beam measured by the probe when checking a beam. On the other side of a beam establish or a rack with the indicator, or a square 4.
Having established under a beam (in a deformation zone) a restrictive emphasis 6, correct a hydraulic press a beam consistently in the horizontal and vertical planes, controlling results of editing on the indicator or the probe on a square 4.
The maximum effort of a press when editing a beam should not exceed 98000 N (10 000 kgfs) that there was no excessive deformation of section of a casing.

       NOTE
With a height of an emphasis 6 which is correctly picked up by practical consideration, a beam it is possible to govern without check a square or the indicator.

Remove a beam from a press and check it as it is stated above, having replaced flanges of A.70172 with "test".
In the absence of the appropriate equipment as an exception, editing of a beam of the back bridge consistently from each party, but with obligatory check of deformation of a beam on both sides (is allowed see. "Check of a beam of the back bridge").