Concreting Inverted Beam

Best casting the remaining portion during molding ceiling, to ensure get best workability

I see nothing wrong with casting the upturn with the next floor columns because the columns are unaffected by settlement of the concrete during the curing period.

Conversely, it is not a good idea to pour the next floor with the columns below because settlement will result in cracking of the columns.

that good, but the asking was about the inverted beam not a column

wisam,

You are correct, but there is no particular time limit before casting the upper portion of the beam provided the interface is suitably roughened and the reinforcement is designed to resist the horizontal shear between new and old concrete. I see no harm in pouring the upturn at the same time as the columns for the reasons stated before.

ba/ael, please forgive me if this sounds uninformed...

Can you (or someone) please clarify 'Inverted Beam'? Is it an inverted 'T' beam and block construction? I am assuming so; your comments and advice seem to point towards that construction.

Hi doorman,

An inverted beam is an upturned beam where the underside of beam is flush with the underside of slab and the upper portion extends above the top of slab. It is not convenient to cast it with the slab because the side forms are not easily supported until after the slab concrete has set up.

Ah HA! Understood. Thank you Bruce. This clarification makes #4 the 'Good Answer'.

Doorman may have understood that, but sorry, I don't. How does the slab relate to the beam? Are the beams some distance apart, with transverse members to form a floor? Or close together, with just e.g. a mortar fill?

Is the beam I or T section or something else? What is the "normal" way up, that it's inverted from?

Cheers.........Codey

Normally, the beam and slab are poured together with the beam below the slab.

An upturned or inverted beam is above the slab.

The inverted beam with slab should be concreted in single pour. It is a monolithic one. First pour the slab then the beam with surrounding column as a single pour with out any cold joint. Beam form work is not a problem at this case with use of tie rods or bolt and sleeves etc. In normal practice the concrete to be cast at single pour.

jai.vignesh

I support your note.

thks for u r reply.but th

e problem is it is 42 m in length and how it can be supported i dont u stand?

Can you post a cross section of the beam and slab?