FI80113B - FOERFARANDE FOER ATT PUNKTVIS FAESTA HAOLPLATTOR. - Google Patents

Abstract

1. Process for fixing hollow chamber sheets (1) of high impact strength plastics to a sub-structure (2, 6) at points, by means of screws (3, 5) which pass through the hollow chamber sheet (1) and secure the hollow chamber sheet (1) to the sub-structure (2, 6) in a manner known per se, characterised in that the threaded end of the screw (3) or screw bolt (5) is punched through the hollow chamber sheet (1) to form an opening and the hollow chamber sheet (1) is then secured to the sub-structure (2, 6) by tightening the screw connection.

Description

'80113

Method for pointwise attachment of hollow core plates. -Förfarande för punktfästning av hälskivor.

The invention relates to a method for point-fixing fastening plastic hollow core plates to a region structure with screws which are passed through the hollow plate and providing fastening of the hollow plate to the region structure in a manner known per se.

Plastic hollow core slabs are fastened, for example, with moldings with an edge on the area structure (cf. "Problemlösungslexikon Stegdoppel- und Stegdreifachplatten", Firmenschrift der Rohm GmbH, Darmstadt, 1982). In addition, usually the point fixings are placed inside the surface of the hollow plate. In this case, the plate is drilled through, a screw is passed through the bore and the plate is fixed to the substructure by tightening the screw connection (see the aforementioned publication p. 13, Fig. 27a). When the opportunity arises, only this mortgage will be selected. When attaching large surfaces, the necessary drilling and screwing steps take a considerable amount of time.

Point-like fastenings inside the surface of the hollow plate are possible according to EP-A 59965, when the hollow plate has numerous back-cut notches, which, however, are not the case in the case of ordinary hollow plates.

The object of the invention is to simplify the method for fastening hollow core plates of impact-resistant plastic with a screw connection on a substructure. It has been found that pre-drilling of the fastening points can be dispensed with without disadvantage and the screw can simply be pushed through the hollow plate, as shown in the characterizing part of claim 1. In this case, the double outer walls of the hollow plate break, but in the case of impact-resistant plastics, no increase in the resulting cracks is noticed. The labor cost of fixing a large surface, which can be fixed at many points 2 80113, is thus reduced by less than half.

The hollow core plate is made of plastic with an impact strength of not less than 5 mm N / mm ^ and is preferably 15-30 mm N / mm ^ (obtained in the impact bending test of a standard small rod, according to DIN 43453). Suitable are, for example, polycarbonate plastics, impact-resistant, modified polymethyl methacrylate, polystyrene, polypropylene and copolymers of methyl methacrylate and acrylic esters. The hollow plate is extruded in one piece and comprises two parallel, planar outer surfaces, optionally interposed parallel center plane, and partitions connecting the outer walls in one piece and optionally crossing the center plane. The total thickness of the hollow plate is usually at most 12 mm, preferably 4-8 mm. The thickness of the outer walls is at most 0.3 - 1 mm. Partitions and possibly the middle level may be thinner than the outer walls. Point fixings are especially important when the plate is more than 1000 m wide and less than 6 mm thick.

Suitable for the area structure is any support structure which comprises a plate or plates in the desired position and is suitable for receiving the moving loads present. Suitable are metal rafters, wooden or plastic rods, GRP parts and the like. The attachment points are preferably placed in the area structure at 20-50 cm intervals.

Very preferably, the area structure is a metal groove with a retracted screw notch 4 into which a screw can be inserted without pre-drilling.

It is preferred but not necessary that the end of the screw inserted through the hollow plate be sharp. Preferably, the screws are not thicker than the inner thickness of the cavity and are e.g. 3-6 mm.

3,80113

There are two types of screw connections, which are shown in Figures 1-5 and made according to the screwing method.

According to Figures 1 and 2, the plate 1 is placed on the plate 2, the screw 3 is inserted through the plate and screwed into the screw nut 4 of the perch.

In the embodiment according to Figures 4 and 5, the screw bolt 5 is fixedly connected to the groove 6, e.g. by welding, screwing or impact. The plate 1 is placed against the tip of the screw bolt and the screw bolt is struck, e.g. with a hammer blow, whereby the screw bolt penetrates through the plate. Now the nut 7 can be screwed into place.

It is generally preferred that the hollow plate not touch the ort. For this purpose, spacers 8, 9 can be connected between the perch and the plate. As intended, only one screw leads through each spacer. To facilitate installation, the spacer preferably comprises means for temporarily attaching to the area structure, for example an adhesive tape, fixing jaws or tongues 10 for anchoring the screw nut 4.

Claims (9)

A method for spot-fastening heel plates (1) of impact-resistant plastic onto a substructure (2, 6) with the aid of screws (3, 5), which is passed through the heel plate (1) and the attachment of the heel plate (1) to the substructure ( 2, 6) is accomplished in a manner known per se, characterized in that the threaded screw (3) or screw bolt (5) is pushed through the heel plate (1), where the passage opening is pierced and then the heel plate (1) is fastened. ) at the substructure (2, 6) by tightening the screw connection. Method according to Claim 1, characterized in that a heel plate (1), the thickness of which is not more than 12 mm, most preferably 4-8 mm, is used. A method according to claim 1 or 2, characterized in that a polycarbonate plastic heel plate (1) is used. Method according to any one of claims .1-3, characterized in that the screw (5) is attached to the substructure (6), on which the heel plate (1) is placed, the screw (5) is pushed by pushing through the heel plate (1). and that a nut (7); fasteners to secure the heel plate (1). Method according to any one of claims 1-3, characterized in that the heel plate (1) is placed on the base (2), the head of the screw (3) is pushed through the heel plate and the screw is tightened at the base. Method according to any of claims 1-5, characterized in that between the substructure (2, 6) and the heel plate (1), at least one washer (8, 9) is fitted, which prevents immediate contact between the attached heel plate and the substructure. 1 80113 Method according to claim 6, characterized in that at least one screw (3, 5) is passed through each washer (8, 9). Method according to Claim 6 or 7, characterized in that the washer (8) before the placement of the neck plate (1) on the substructure (2) is temporarily attached to one of said parts. 9. A method according to claim 8, characterized in that the washer (8) is temporarily fastened by means of the tongs (10) to the screw cutter (4) in the substructure (2).