Salient points
While pour of Chimney Shell by slipforming methodology.
In order to ensure high quality concrete while pour of Chimney shell, under mentioned
points are to be taken care of while execution:
1. Concrete layer thickness shall not exceed 250 mm.
2. Sliding of slipform panels shall not exceed 25 mm per lift.
3. Slipping of form panels shall after be 3 to 4 hours subsequent to completion of
placement of earliest layer.
4. The lifting frequency of form panels shall be restricted to 10 minutes.
5. Freeboard in slipform panels shall be maintained minimum 250 mm while top
layer is poured.
6. Care shall be exercised that concrete manufactured is consumed within 2
hours 30 minutes; this includes time consumed towards manufacture of
concrete, transportation of concrete and final placement in to the forms.
7. At two discrete locations diametrically opposite to each other , tilt and / or
twist and / or complex phenomenon involving tilt and twist shall be checked
@ 6 [six] hours interval during the course of pour. This verticality check shall
be exercised with “Self-Leveling-Auto-Shut-Off” LASER instrument. The
locations at ground where the instruments are proposed to be placed shall be
protected from spilled off concrete from atop, e.g., by covering with Plastic
sheet or empty cement bag.
While pour of Chimney Shell by slipforming methodology.
In order to ensure high quality concrete while pour of Chimney shell, under mentioned
points are to be taken care of while execution:
1. Concrete layer thickness shall not exceed 250 mm.
2. Sliding of slipform panels shall not exceed 25 mm per lift.
3. Slipping of form panels shall after be 3 to 4 hours subsequent to completion of
placement of earliest layer.
4. The lifting frequency of form panels shall be restricted to 10 minutes.
5. Freeboard in slipform panels shall be maintained minimum 250 mm while top
layer is poured.
6. Care shall be exercised that concrete manufactured is consumed within 2
hours 30 minutes; this includes time consumed towards manufacture of
concrete, transportation of concrete and final placement in to the forms.
7. At two discrete locations diametrically opposite to each other , tilt and / or
twist and / or complex phenomenon involving tilt and twist shall be checked
@ 6 [six] hours interval during the course of pour. This verticality check shall
be exercised with “Self-Leveling-Auto-Shut-Off” LASER instrument. The
locations at ground where the instruments are proposed to be placed shall be
protected from spilled off concrete from atop, e.g., by covering with Plastic
sheet or empty cement bag.
