| 摘要 |
Construction elements comprising two parallel nailable plates interconnected by corrugated metallic web sheets extending edgewise between them and having teeth at their edges embedded in the plates are made by placing the bottom plate thereof in a movable frame having displaceable abutments connected to clamping means. The web sheets are placed in positions so as to be clamped at their extremities by clamping said means, the extremities of longitudinal sheets being pinched in folds of transverse end sheets. Also, interlocking deformations are punched in the adjoining webs. The clamping means are moved for stretching the sheets, the upper plate is placed on top, and web sheets and plates are brought into correct relative positions by corresponding positioning of the abutments. In addition longitudinal web sheets extending along edges of the element are supported externally between clamping points by spring-loaded rulers connected to abutments so as to ensure correct spacing from the plate edges. With the components of the element thus aligned, the frame is moved into a press and the components are pressed together, the abutments yielding vertically against a spring-load. Then the frame with the element is removed from the press, and the grip by the abutments and clamping means is released. For permitting stepwise pressing of elements longer than the press, the latter has a smoothly converging entrance portion. In its preferred form, the web sheet has a largely trapezoidal corrugation, a Z-shaped cross-section of the teeth and shallow depressions between the consecutive teeth, suited as starting points for folds to be formed.
|
