FORM WORK 



337 



the planks beneath the soffit of the beams and girders may 

 be retained in position by means of struts h. 



Another type of collapsible 

 form is shown in Fig. 6. In 

 this form, the box that supplies 

 the form work for the sides 

 of the beams and the center- 

 ing of the slabs, instead of 

 being hinged, is cut through 

 along the line a a and is held in 

 position by the slotted iron 

 plate b and screw e. By re- 

 leasing and loosening the 

 screw, it will slip in the slot c. 

 Then one -half of the form can 

 be drawn downwards, so that 

 it will recede from the face of 

 the beam and thus allow the 



form to free itself from the concrete and be taken down. 

 It will be observed that the sides of the collapsible forms 

 make the sides for the beam forms, the battens d furnishing 

 the support for the bottom form board f of the beams. 



FIG. 8 



FIG. 9 



FIG. 10 



Heavy Construction Partly Collapsible Forms. In Fig. 7 

 are shown the details of a form construction for a reinforced- 



