IL31019A - Plate element,for shutterings,scaffoldings and the like and method of its production - Google Patents

Description

PLATE ELEMENT. FOR 3HDTTERINQS . SCAFFOLDINGS AND THE LIKE AND METHOD OF ITS PRODUCTION The invention concerns a panel for concrete shutterings, scaffolding platforms, shelf bottoms, stacking racks, fencing for constructional sites and the like, the panel being of hollow composite form.

There are known box shaped panels, such as those comprising two plywood plates connected by a wooden frame and being provided with distance ribs between the plates. Such panels are rather heavy and the lateral sides or edges are fully closed and plane. For connecting vicinal plates auxilliary and additional means are required, which, when put in place, frequently damage the panels.

Ther are known also panels comprising two parts made of plastics. These require embedded metal reinforcements which raises the cost of such panels. There are also problems of connection, as in the first named type.

There are further known panels for shutterings which comprise; one facing only, the underside of which is provided with ribs extending the length and width of the plate. Here also an all round extending frame is provided, the internal space of which is occupied by the criss-cross extending ribs. This panel is also very heavy and its preparation becomes complicated due to the numerous crossing points of the ribs. The connection between a number of such panels is effected by screw bolts which have to be kept in readiness.

It is the object of this invention to provide a panel for the above-mentioned purposes, or further purposes - aa the oase may be - which panels can be made quickly and with simple means and using also a minimum amount of material. Furthermore it is an object of the invention to provide for an easy and quick connection between vicinal panels.

In view of the above requirements, according to the present invention there is provided a rectangular buildin panel having two outer facings, at least one of which is formed as a complete sheet which is connected to the other facinjg by ribs extending parallel to one side edge of the panel, the intermediate spaces extending in the longitudinal direction of the panel between the facings and ribs being shaped to form coupling pockets for receiving^ coupling 'doweTtTj for connection with adjacent panels.

Reference should now be made to the accompanying drawings , in which*- Pig; ¾ is a perspective view of a panel con- . structed according to the invention} Fig. 2 is a section through a panel in accordance with the invention, taken on the line II-II of Fig. 4; Fig. 3 is a similar section taken on the line III III of Fig. k Fig. k is a vie from below o another shuttering panel of the invention Fig. 5 shows a plywood panel which panel ds cut up to produce ribs with rectangular section fillets ; Fig. 6 shows a panel which is cut up to provide ribs with fillets of triangular section; and Fig. 7 shows a panel which is cut up to provide with fillets ribs of half-round section.

Figure 1 shows a hollow composite panel with transverse battens 7 glued on to ribs 2, at the ends of the panel, with at least one batten near the centre of the panel, whereby pockets 71 are produced between: the parts 1, and 7» in which pockets coupling dowels — - ■ · - — — — ■ ■ — ^ for connection with adjacent panels may be inserted..

Bracing members to withstand concrete pressure may be mounted in the region of these battens, or between them. In place of individual battens 7 a single continuous sheet of plywood corresponding to the cover panel 1 may be provided.

Figs, 2 to h show a shuttering panel comprising an upper plywood sheet 91 having longitudinally and transversely extending edge strips 92 or 93 respectively each strip having two fillets 9^ glued, to its edges.

There are longitudinally extending ribs 95 each having four fillets 9k glued to their edges together with plywood battens 96 glued on the underside of the panel; transversely to the ribs 5 and edge strips 92. This embodiment is for use where the overall weight of the panel is to be kept as low as possible. The strength of the panel is improved if in place of the battens 96 a continuous lower base plyoood sheet is used to form a box member open at the ends to receive coupling dowels.

The ribs and edge strips may also be made of plywood.

As shown in Fig. 2, the ribs are secured by glueing at 97 and 98 by means of the fillets 9 to the cover sheet .91 and the batten 96. If a distorting force acts on a rib or an edge strip, then this force is transmitted at least in part via the battens to other ribs and/or edge strips. Such forces are therefore distributed to produce only a slight resilient deformation, and peak stresses are substantially diminished* This applies more particularly where a continuous lower plywood sheet is used, In accordance with Fig. 5 i strips 101 are oppositely located on both sides of a plywood sheet 99; they have a flat rectangular cross-section and are glued parallel to one another at a distance apart which corresponds substantially to the required height of rib. This sheet is then cut into identical ribs 5 , (fig* 2 ) by means of a multiple blade mechanical saw the individual saw blades of which have a constant spacing a_. The halves of strips 101 now become the fillets 9^· If the ribs are to be provided with fillets on one side only, then strips are mounted only on one side of the panel 99 , as shown in Figs. 6 and 7.

In Fig. 6 triangular strips 102 are used which, whilst reducing weight, retain the glueing area of the strips 101. Half-round strips 103 as shown in Fig* 7 are preferred, since they give a stronger bond between ri and sheet and yet provide a weight reduction as compared with rectangular strips.

The application of glue to the ribs and fillets provides no difficulties, since theyare passed edgewise through an application device and then pressed on to the cover sheet or battens. Preferably, a waterproof plastics material glue should be used , wiiich is applied in a hot state and sets on cooling* .

Bracing members in the form of glued-on strips may be provided if required* To keep weight down and to adequately distribute distorting forces throughout the panel, these bracing members are expediently inserted at points midway between the battens .

Claims (1)

1. WHAT IS CLAIMED ISs A shuttering assembly to be used as part of a concrete mold, formed by at least two panel structures, each structure comprising a forward wall having an uninterrupted front surface, an opposed rear surface, and two pairs of opposed side edges, a plurality of uniform elongated reinforcing ribs secuzied to said wall inwardly , of one of the edge pairs, all of said ribs being situated parallel to each other in planes normal to that of said front surface and extending rearwardly beyond said rear surface, a rear wall secured to said reinforcing ribs, said ribs further defining with said forward and rear wall at leait two elongated pockets extending through said panel in a direction parallel to said ribs and opening at the other of said edge pairs and connecting elements extending within said pockets between ddjacent panels form said assembly. s ) p 0. Box 3!!t6, 1e Av' M,„,«ye 'tor AppHcan.