www.sefindia.org

[ALOSNL]

Dear Sir

In continuation with the view points of Mr. Jignesh Shah I would like
to point out that neither in the earlier IS:800 nor in the newly drafted
IS:800 has any provision of relative displacement of the top of rail
while the crane is in operation.

In industry buildings with high crane capacity relative displacement of
the top of rail becomes a critical aspect from serviceability point of
view.

A definite recommendation in this regard in given by the Russian Code
of practice is reproduced below with heavy service conditions. Refer
Clause No. 10.7 & Table46 of SNiP II - B.3-72

1> H/2500 (with plane structural scheme)
2> H/4000 (with 3D structural scheme)

where , H = Height of column from u/s of column to the top of crane
rail

It has been observed the above clauses make the frame very heavy and
thereby uneconomic. So the plant owners for smooth serviceability of
crane and to reduce vibration have restricted the relative displacement
to 10mm to 15mm.

So Iwould request the Committee members of IS:800 to introduce a clause
which will be a guideline for the relative displacement of the top of
the rail.

Regards



ALOKES GUHA
L&T - SARGENT & LUNDY LTD.- BARODA
E-Mail : alosnl@ltecd.ltindia.com
Phone : 02652772390 (Ext 5504)