FI94890C - A conducive pillar - Google Patents

Description

1 94890

GRINDING PILLAR

The invention relates to a compliant column, such as a luminaire column, the structure of which comprises at least part of the column two nested tubes, the inner jacket being formed of a thin-walled tube and the outer jacket being formed of two or more longitudinal columns , that the column is conical, and the sheet metal blocks of the outer casing are connected to each other by edge flanges turned inwards 10 by such joints such that at least one joint opens and the outer casing at least partially cracks due to impact on the column.

Such poles are primarily used along roadsides, as the column that contributes to the collision increases traffic safety. Currently, many people die and are injured in collisions with light poles every year.

However, if the pole gives up more easily, then the person colliding with it has a chance to survive with less injury. A wide range of compliant columns have been developed with different structures.

According to the known method, the yielding of the column is usually effected by making some weakening points in the structure of the column, at which point the column is easier to give up in the event of a collision. However, known column structures are complex and not suitable for conical columns.

’* Other types of column structures are also known. They are briefly referenced in the following list of the prior art.

30 The lamp post disclosed in German application DE-2134 471 is formed in a Y-shape. The pipe in the middle of the structure is only for electrical wiring inside the column 2 94890. It has no effect on the strength properties of the structure. The rigidity of the column is provided by the shape of the outer shell.

Another German application DE-2028 763 discloses a structure in which intermediate members are arranged between the inner tube and the outer tube. However, such loose spacers make the structure of the column difficult to manufacture.

The structure disclosed in British Patent GB-1270 080 consists of a plastic inner tube for electrical wires 10 and a foam layer outside it. The outer layer is spirally wound from a thin metal strip.

In French patent FR-1016 206, a hollow column is formed of two troughs connected to each other by 15 external connecting pieces. The structure is not double-shelled, so it differs substantially from the column according to the invention.

In European patent EP-00001 964, the column is formed by a tube in which successive longitudinal grooves are made. The grooves 20 are not continuous along the entire length of the column, but annular non-grooved points are left between them. The purpose of the structure is that the annular points hold the structure together, but in a collision the column breaks into strips at the grooves. The structure does not correspond to the two-pipe structure according to the invention.

The object of the present invention is to provide a structure of a compliant column in a new and simple manner. The invention is characterized in that the upwardly tapering sheet metal blocks of the outer sheath are connected to each other by 30 edge flanges turned inwards by spot welding points or corresponding pressing members for at least part of the length of the column.

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The space between the tubes may be filled with foam, such as styrofoam or polyurethane, which is injected between the inner and outer sheaths.

At the lower end of the column according to the invention, for example, an impact-prone area of about 3 m length is formed, in which the blocks of the tubular jacket are fastened to each other so that in the event of a collision these blocks become detached from each other. Preferably, the blocks of the outer jacket are then connected to each other by a compression strip which compresses the longitudinal flanges of the column 10 formed at the edges of the blocks. In other respects, the blocks are attached to each other by welding.

The strength of the column against bending and twisting is based on the combined effect of two nested tubes of different sizes. Hard foam between the pipes, such as styrofoam, for example, keeps the structure unchanged in a wind-induced bending situation. The bending situation caused by the wind load does not separate the sheath blocks from each other. The intact outer sheath withstands it well, although it accounts for about 75% of the bending resistance. In order to detach the blocks of the casing from one another, a local collision impact is required, such as, for example, a car colliding with a pole.

When colliding with a column, the balance of the column structure changes. The thin outer casing is not impact resistant. The foam inside the column does not prevent the outer jacket from sinking into the ball. At the same time, the bending resistance of the outer sheath decreases decisively. Since the effect of the outer sheath on the strength of the column is decisive, the strength of the entire column as it sinks into the pit. decreases substantially.

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When a block of the outer jacket presses against the pit in a collision, it simultaneously presses towards the inner jacket, whereby the seam between the blocks opens. As a result, the foam is squeezed out of the seam and the outer sheath cracks. In this case, the strength of the column collapses and the force against the collision is mainly only. the force generated by a collision with the inner jacket tube. The force is relatively small, as the inner sheath accounts for only about 25% of the bending resistance of the entire column.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which Figure 1 shows a vertical section of a compliant column according to the invention.

Figure 2 shows a section taken along the line II-II in Figure 1.

Figure 3 shows 10 sections taken along the line III-III in Figure 1.

Figure 4 corresponds to Figure 3 and shows another embodiment of the invention.

Fig. 5 shows a partial enlargement taken from Fig. 1 according to a third embodiment.

Fig. 6 corresponds to Fig. 5 and shows a fourth embodiment.

Fig. 7 corresponds to Fig. 6 and shows a fifth embodiment.

Fig. 8 shows 20 sections taken along the line VIII-VIII in Fig. 7.

Fig. 9 shows a section taken along the line IX-IX in Fig. 7.

Fig. 1 is a schematic vertical section of a compliant luminaire column 10 according to the invention. It can be seen from Fig. 25 that the column is formed mainly of a conical outer jacket 11 and a cylindrical inner jacket 12. The space between the jackets 11 and 12 is filled with hard foam. with a plastic 13 such as styrofoam or polyurethane.

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In the embodiment of Figure 1, the conical outer sheath 11 is formed of three blocks connected to each other by longitudinal seams of the column 10. The way these joints are joined is different in different parts of the column because the collision with the column usually occurs at its lower part. Therefore, at the bottom of the column, the joints of the outer sheath 11 are easier

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to open. These structural details are shown in more detail in Figures 2 and 3.

In the cross-section of Figure 2, the inner jacket 12 of the column 10 is a unitary cylindrical tube, but the outer jacket 11 is formed of three interconnected blocks. These blocks 14 of the outer jacket 11 are longitudinal troughs of the column, the edges of which are turned inwards into edge flanges 15. At this point of the column 10 the blocks 14 of the outer jacket 11 are connected to each other by edge welding at points 16, because the top of the column 10 does not have to be compliant. The space between the outer sheath 11 and the inner sheath 12 is filled with a hard foam 13 such as styrofoam or polyurethane.

Figure 3 shows a cross-section taken from the lower part 15 of the lamp post of Figure 1. This section shows the part of the lamp post where it is likely to collide. Therefore, the trough-like blocks 14 of the outer sheath 11 are not welded. they are connected to each other, but are connected together by pressing members 17. These pressing members are troughs open on the side or 20, for example, pipes, the seam point of which is left unsealed. Such an open seam tube 17 can be pushed into place from the lower end of the column 10 so that the edges of the tube 17 press the edge flanges 15 of the adjacent blocks 14 of the outer sheath 11 against each other.

If the column structure shown in Fig. 3 is collided from the side, then the block 14 of the outer casing 11 presses against the pit. In this case, the deformation causes the edge flange 15 to move away from inside the pressing tube 17, whereby. the compression joint between the blocks 14 opens. As a result, the hard foam 13 inside the column 30 is squeezed out of the seam and the outer sheath 11 cracks. When the structure of the column 10 is broken in this way, it easily surrenders, thus minimizing the impact impact it causes.

Figure 4 shows a cross-section of another embodiment of a column 6 94890, in which the outer jacket 11 is now formed of four interconnected blocks 14. The edge flanges 15 of the outer jacket blocks 14 are formed in the transverse direction of the column so wide that the edges of the edge flanges 15 abut 5. The assembly of such a column 10 takes place, for example, in such a way that the blocks 14 of the outer sheath 11 are connected to each other by three rows of spot welding 16. From one seam the outer sheath 11 is still open, so that it can be mounted on the inner sheath 12 from the side. The outer sheath 11 is then locked in place around the inner sheath 12 by welding from the outside 18. The space between the inner sheath 12 and the outer sheath 11 can still be filled with hard foam such as styrofoam or polyurethane.

Figure 5 shows a vertical section of a third embodiment 15 of the column 10. In it, the column 10 is formed by a tubular inner jacket 12 and an outer jacket 11 consisting of one or more blocks mounted around it, between which there are mainly annular support discs 19. The discs 19 are mounted by pushing them from the wider end 20 of the column 10.

Since the embodiment of the column 10 shown in Fig. 5 is conical, the support discs 19 have different sizes and

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are inserted into the column 10 until they wedge and lock in place against the outer sheath 11 of the column 10.

The retention of the support discs 19 can still be ensured by means of spacers 20 which keep the support discs 19 at the desired distance from each other. This embodiment is shown in Figure 6.

Fig. 7 shows another embodiment of the invention, in which support discs 19 are also used between the inner jacket 12 and the outer jacket 11 of the column 10. In this embodiment the outer jacket 11 is formed of longitudinal blocks 14 of the column, the edge flanges 15 locking in place while the support discs 19 are pushed into the column 10. «35 to reach.

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It can be seen from Figure 7 that the outer sheath 11 is conical, but the locking edge of its edge flange 15 is parallel to the cylindrical inner sheath 12. In this case, support discs 19 can be used, the locking notches of which are always 5 at the same distance from the center of the disc. However, the outer diameters of the discs 19 vary depending on where the disc 19 is intended from the column 10. This structural detail is shown in more detail in the cross-sections of Figures 8 and 9.

Fig. 8 shows a cross-section of a column 10 with an inner jacket 12, an outer jacket 11 formed of four trough-like blocks 14 and a support disc 19. It can be seen from Fig. 8 that four locking grooves 21 are formed in the support disc to lock the outer flanges 15 of two adjacent blocks 14 15. If the column 10 is cylindrical, then all the support discs 19 of the column can be identical. In this example, however, the outer jacket of the column 10 is conical, whereby the outer diameters of the support discs 19 vary.

Fig. 9 shows a cross-section of the column 10 corresponding to Fig. 8. This section is at the point where the diameter of the outer jacket 11 of the column 10 is larger. It can be seen from the figure that the edge flanges of the trough-like blocks 14 forming the outer casing 11 are longer than in the previous figure 8. The locking notches 21 of the disc 19 25 are at the same position as in Fig. 8, but the outer diameter of the support disc 19 is larger corresponding to the diameter of the outer casing 11.

The above application examples show a steel-structured column, but the column can, of course, also be partially or completely made of another material, such as plastic. Further, the columns described in the examples are conical, but the same structure can just as well be applied to, for example, cylindrical or shoulder columns.

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It will be apparent to those skilled in the art that various embodiments of the invention may vary within the scope of the claims set forth below.

Claims (4)

1. Resilient post (10), such as a lamp post, the structure of which is at least formed in one part of the post by two inner tubes (11, 12), the inner man (12) of which is formed by a thin-walled tube and the outer manifold (11) has been formed by two or more thin-plate segments (14) in the longitudinal direction of the post, which are chamfered and tapered, so that the post becomes conical, and the thin-plate segments of the outer jacket 10 are connected via the inward edge flanges (15). with such joints (16, 17, 21), that at least one joint is opened by the action directed at the post through the collision and the outer manifold at least partially fractures, characterized in that the thin plate segment of the outer jacket is connected via the inward edge flanges ( 15) by spot welding (16) or corresponding joints (17, 21) at least along part of the length of the post (10). Post (10) according to claim 1, characterized in that the edge flanges of the segment (14) of the outer sheath (11) have been formed in the transverse direction of the post (10) so wide that the edges of the edge flanges are inclined towards the inner mane. (12). Post (10) according to claim 1, characterized in that the clamping device (17) for the joint between the segments (14) of the outer sheath (11) is a side open chute, such as a pipe, whose seam is left open. 4. Post (10) according to Claim 1, 2 or 3, characterized in that the post (10) has been formed in an approx. Three meters distance from the ground surface so that within this area the outer shell (11) has segments (14) connected to clamping devices (17).