GB2032501A

GB2032501A - Closed Hollow Cross-section Building Component

Info

Publication number: GB2032501A
Application number: GB7837136A
Authority: GB
Original assignee: Individual
Current assignee: Individual
Priority date: 1978-09-18
Filing date: 1978-09-18
Publication date: 1980-05-08
Also published as: GB2032501B

Abstract

An elongate closed hollow cross- section building component e.g. a lintel is made of two pre-formed parts 1, 2, 3 and 4, 5, 6 secured together by at least one seam formed between edge portions of the two parts such that the edge of each part is turned back through at least 180 DEG to provide foundations which may be interengaged by sliding one part longitudinally of the other. <IMAGE>

Description

SPECIFICATION Box-Section Building Component Background of the Invention The present invention relates to box-section, load-bearing building components which are made of sheet metal. The components may for instance be beams such as lintels, e.g. box-lintels or cavity wall lintels (of which British Patent Specifications No. 1,451,801, 1,488,121, 1,222,791 and 1,514,471 disclose some types), or eaves beams, or vertical members such as columns.

The Invention The present invention provides a method as set forth in Claim 1 and building components as set forth in Claims 4 and 12, as well as packaged components as set forth in Claim 1 5. Claims 2, 3 and 5 to 11 set forth preferred features.

The term "rolled seam" as used herein does not mean that the seam has necessarily been made by rolling in a rolling mill-it means that the respective edge portions of the parts at the seam are each turned back through at least 1 80C to form interlocking portions.

The use of the rolled seam in accordance with the invention facilitates fabrication of the building components in that the parts can be shaped more easily, and at least initial assembly of the final boxsection can be performed by sliding the parts longitudinally with respect to each other. The individual parts can be rolled, for instance with the last three or four roll passes of the rolling mill having flanging rolls to put in rolled sections on the edge portions of the parts. After assembly, the rolled sections can be pinched if desired, or other forms of fixing can be used. However, it is not essential that the rolled sections should be further fixed, for instance if the components are assembled on site.

The further advantage of the invention is that the components can be transported while in parts with the parts nested. This is particularly useful if the components are made of two identical parts, but can also be useful if the components are made of two different parts, when groups of the same part can be nested together.

The building components can have two rolled seams to make the box section, or the other join can be of any desired type, such as by riveting or spot welding or the use of a suitable adhesive; however, the preferred form of the other join is as set forth in Claims 2 and 5.

Description of Preferred Embodiments of the Invention The invention will be further described, by way of example, with referenece to the accompanying drawings, in which: Figure 1 is a projection of a lintel in accordance with the invention; Figure 2 is a part section, on a larger scale, along the line Il-Il in Figure 1; Figure 3 is a section along the line Ill-Ill in Figure 1; Figure 4 is a section, on the same scale as that of Figure 2, along the line IV--IV in Figure l:and Figure 5 is a vertical section through another lintel.

Figure 1 shows a cavity wall lintel of a type which is now generally known and is disclosed for instance in the British Patent Specifications referred to above. It is assembled for two preformed sheet metal parts, one of which is of Lsection and forms the rear wall 1 and the bottom wall 2 as the bottom part 3 of a fowardlyprojecting flange, and the other of which is of generally cranked section and forms the top part 4 of the flange, the dished front wall 5 and the top wall 6. The rear wall 1 is fluted with vertical depressions 7 (see Figure 3) and the rear and bottom walls 1, 2 are provided with punched apertures 8 to act as keying for plaster.

Both parts are pre-formed with the rolled seam section at the top rear corner of the lintel, where the walls 6, 1 meet at a substantial angle. As can be seen in Figure 2, the rear wall 1 has a short, rectilinear, horizontal portion 9 which engages beneath a short, rectilinear, horizontal portion 10 which forms part of the flat part of the top wall 6, thus providing good vertical support for the top wall 6. The rear wall 1 is bent inwards so that the rolled seam projects inwards into the interior of the box-section, and the edge portion of the rear wall 1 is turned back through 360 at the rolled seam while the edge portion of the top wall 6 is turned back through 2700.

At the diagonally opposite part of the lintel, there is a seam formed by making an approximately 1 800 bend (see Figure 4) 1 1 in the part 4, which bend 11 receives the edge portion of the part 3. In practice, there is slight play between the inner faces of the bend 11 and the sides of the part 3, either by having the bend slightly less than 1 800 or by allowing greater space between strictly parallel inner faces. There is a very small lip 12 on the edge of the part 4.

The parts described above can be formed by rolling from mild steel sheet, and are preferably provided with a film of oil for ease in assembly.

The lower part (with the back wall 1, bottom wall 2 and part 3) can be of thinner gauge, e.g. 1.6 mm, than the upper part, which may be e.g. of 2 mm, due to the provision of the depressions 7.

In order to assemble the parts, they are slid longitudinally of each other. Subsequently, the rolled seam can be pinched if desired using an internal mandrel and an external hydraulic former.

Preferably, the bend 11 is pinched . By having slight play in the bend 11, the parts slip together easily and any scratching of say pre-galvanised material by burrs on the part 3 can be reduced, so that some pinching is required. Furthermore, a hard pinch stops water penetration into the interior of the bend 11. Figure 4 shows the use of an upper, relatively flat pinch roll 1 3 which avoids damage to the upper face and also avoids forming a groove which could trap water, and a lower, more pointed section pinch roll 14. After pinching, the projecting flange can be spot welded at points 15, as indicated in Figure 1.

Figure 5 shows that there can be two rolled seams at generally diagonally opposite parts of a beam or lintel, the beam or lintel of Figure 5 being formed of two identical L-section parts 1 6. The rolled seams are as described in relation to Figures 1 and 2.

Claims

1. A method of making a box-section, loadbearing building component, comprising preforming two sheet metal parts and securing them together at two positions which are spaced apart as seen in vertical section, each of the parts being preformed with a rolled seam section at at least one of said positions and the respective rolled seam sections being interfitted by sliding one part longitudinally of the other.

2. The method of Claim 1, wherein there is one rolled seam and, at the generally diagonally opposite part of the beam, as seen in crosssection, there is a seam formed by making an approximately 1800 bend in the edge portion of one part which receives the edge portion of the other part, the edge portion of the other part being slid longitudinally into the bent edge portion of the first part.

3. The method of Claim 1 or 2, wherein there is one rolled seam and, at the generally diagonally opposite part of the beam, as seen in crosssection, there is a seam formed by making an approximately 1800 bend in the edge portion of one part which receives the edge portion of the other part, there being slight play between the 1800 bend and the edge portion of the other part, and, after fitting the edge portion of the other part into the bend, the bend is nipped tightly closed.

4. A box-section, load-bearing building component which, as seen in vertical section, comprises two sheet metal parts which are secured together at two spaced positions to form a closed profile, the two parts being secured together by a rolled seam at at least one of said positions.

5. The component of Claim 4, wherein there is one rolled seam and, at the generally diagonally opposite part of the component, as seen in crosssection, there is a seam formed by making an approximately 1800 bend in the edge portion of one part which receives the edge portion of the other part.

6. The method or component of Claim 1 or 4, wherein there are two rolled seams at generally diagonally opposite parts of the component, as seen in vertical section.

7. The method or component of any one of the preceding Claims, wherein the rolled seam or at least one of the rolled seams is in a generally vertical wall of the component and at the seam, as seen in vertical section, the lower part has a rectilinear, horizontal portion which engages beneath a rectilinear, horizontal portion of the upper part.

8. The method or component of any one of the preceding Claims, wherein the rolled seam, or at least one of the rolled seams, is where two walls of the component meet at a substantial angle, as seen in vertical section.

9. The method or component of Claim 8, wherein at the rolled seam, or at at least one of the rolled seams, as seen in vertical section, the edge portion of one part is turned back through about 3600 and the edge portion of the other part is turned back through about 2700.

10. The method or component of Claim 7 and of Claim 8 or 9, wherein the flat part of one wall of the component forms the respective horizontal portion.

11. The method or component of any one of the preceding Claims, wherein the rolled seam, or at least one of the rolled seams, projects inwards into the interior of the box-section.

12. A box-section, load-bearing building component made by the method of any one of Claims 1 to 3 and 7 toll.

13. A box-section, load-bearing building component substantially as herein described with reference to, and as shown in, Figures 1 to 4 or Figure 5 of the accompanying drawings.

14. A method of making a box-section, loadbearing building component, substantially as herein described with reference to, and as shown in, Figures 1 to 4 or Figure 5 of the accompanying drawings.

1 5. Packaged parts for making a number of the components of any one of Claims 4 to 13, the parts not being assembled but being nested with identical parts.