concrete is deposited by means of sheet iron which 

 must be withdrawn as the concrete is deposited. 



Work must be carried on in such a manner that the 

 workmen can be kept off the green concrete. Persis- 

 tent offenders should be discharged. 



Work must not be stopped on a column until it has 

 been brough up to the elevation of the lower surface, 

 of the connecting beams. 



During the placing of the concrete it must be con- 

 stantly puddled to work out the air bubbles. Occas- 

 ionally the lower portion and the upper portion of 

 columns, for from two to three feet, are poured with a 

 rich cement mortar. 



Points at which Work can be Stopped. After the 

 placing of the concrete has been commenced it must 

 be carried forward continuously until a suitable stop- 

 ping point has been reached. Beams and girders should 

 be completed from the center of one panel to the 

 center of the next panel and carried up to the eleva- 

 tion of the bottom of the floor slab. Some carry it 

 from column center to column center; but the former 

 is better practice. If work is to be stopped before the 

 slab is concreted extra reinforcement must be placed 

 to compensate for the loss of area due to the omission 

 of the floor slab. Additional tics shall be used to bind 

 the beam to the slab and continuity bars must be 

 placed at each end of the beam to tie it into the beam 

 coming upon the opposite side of the column. The 

 floor slab must be completed simultaneously with the 

 beams. In stopping work on a monolithic floor slab the 

 entire slab must be placed so that the break will come 

 at the centers of the panel. 



Work must always be stopped at a point at which 

 the shearing stresses are a minimum. 



Night Work. It is sometimes necessary to continue 

 the work into the night in order that a suitable stop- 

 ping point may be reached by continuous work. Night 

 work must not be done except in cases of emergency. 



