| 1. | Arrangement in a pole base, where the pole has a preferably thin walled and/or weak pole mantle (1) provided with an interior reinforcing means in the form of elongated rods (2), wherein the lower end of the pole is adapted to be inserted into an elongated opening in the base, characterised in that inside the lower end of the pole to be inserted into the base opening, and inside the reinforcing rods, a pipe (3) having an outer diameter adapted to the space inside the inwardly facing portions of said reinforcing rods (2) is inserted, and that the lower ends of the reinforcing rods (2) are rigidly connected (5, 6) to a lower end portion of the pipe (3). |
| 2. | Arrangement according to claim 1, characterised in that the lower ends of the reinforcing rods (2) are secured to the lower end portion of the pipe (3) by means of welds or the like. |
| 3. | Arrangement according to claim 1, characterised in that the lower ends of the reinforcing rods (2) by means of screw connections or the like (6) are rigidly connected to the lower end portion of the pipe (3). |
This invention relates to an arrangement at a base for poles or posts according to the preamble of claim 1.
It is known to arrange at concrete or similar material pole or post bases an elongated opening adapted to the foot end of a post, into which opening the post is inserted and secured by means of a collar or the like. This procedure can, especially on posts having a thin and/or relatively weak mantle provided with internal strengthening or reinforcing rods result in inconveniences should the post be subjected to heavy lateral forces. At such posts you may, in stead of mechanical connections between mantle and reinforcing rods use adhering means, e.g. adhesives, wherein the rods generally have larger width than thickness, by means of such adhesive are secured to the inside of the mantle. The adhesive is directly or as a double adhering tape, arranged between the strengthening rods and the mantle. When the post is subjected to heavy lateral forces, adhering forces between rods and mantle may result in a deviation from the intended position of the post and that the post, when the forces cease is unable to return to its earlier position, or that the strain is so high that there occurs a rupture in the adhesive, resulting in a following collapse.
The intention behind the invention is to eliminate the drawbacks mentioned above and the invention is characterised in that a rigid connection is arranged between the lower ends of the reinforcing rods and that the rods along a limited portion of their lower end portions are held radially and peripherally positioned. This is
achieved by having a length of pipe or the like inserted in the space defined by the inwardly facing portions of the reinforcing rods and rigidly fastening the lower end of said rods at the lower end portion of said pipe, which extends approximately to the upper end of the opening of the post base, so that the elastic inclining of the pipe caused of compressive and tensile forces of the rods, results in no contact forces between the pipe and the mantle and at the connections between the strengthening rods and pipe to such an extent that any form or unallowable materials influence resulting in full or partial rupture may be expected.
The invention will be further described below with references to the accompanying drawing, in which
Fig. 1 and 2 are cross and length sections, respectively, illustrating a preferred embodiment of the arrangement according to the invention, viz. the lower end of a post and base arrangement arranged according to the invention.
Fig. 3 is a longitudinal section of an alternative embodiment of the invention and
Fig. 4 likewise in longitudinal section illustrates how the forces act or function on exposing the post to a bending moment caused by lateral forces.
Figs.l and 2 show a mantle 1 of a post, made of relatively thin aluminium or thin steel sheet material or another thin sheet material, in all cases strengthened or reinforced by means of reinforcing rods 2, preferably made of high strength steel. The said rods 2 are continuously or intermittently secured to the inside of the post by means of e.g. soldering, glue or double acting adhesive tape or the like.
Inside a space defined by the inwardly facing portions of trie reinforcing rods, a so called anchor pipe 3 is inserted and said pipe has such a length that the upper end
thereof will be approximately at the same level 4 as that of the post base and with the lower end preferably extending beyond the lower ends of the reinforcing rods As can be seen, the lower ends of the reinforcing rods are, according to the invention, by means of welds 5, at least in the longitudinal direction of the rods, rigidly secured to the lower end portion of the pipe 3.
In Fig. 3, which essentially corresponds to Figs. 1 and 2, the lower end of the pipe 3 is somewhat tapered for subsequent fitting into a bottom seat at a post base. As also can be seen the welds are replaced by bolt and nut connections 6.
Figure 4 schematically illustrates how the reinforcing rods 2 and the anchor pipe 3 co-act to eliminate the risk from lateral forces acting against the post causing relative movement between the rods and the mantle and consequently remaining oblique moving of the post or its collapse.
If a post, not shown in Fig. 4, is exposed to a lateral force, the reinforcing rods at the one side will be exposed to tension 7 and opposing reaction force or thrust 8
from the adhesion material, whereas the rods at the opposite side are exposed to compression 9 and opposing forces from the adhesive material. The adhesive forces 8 and 10 are able to, to a certain extent, oppose the tensional and compressive forces at the rods, but on heavy force conditions permanent displacements between post mantel and rods or even ruptures could be expected.
By means of the arrangement according to the invention, where the lower ends of the reinforcing rods are rigidly connected to the lower end of the pipe 3 and thereby a gives a lateral or horizontal positioning to the pipe along its length, and the upper end of the pipe is positioned laterally at the mantle by the reactive force 11 and at the lower end by the abutment force 12, the rods are securely anchored.
The invention is not to be regarded as restricted to the example shown and described, and may be modified in a number of ways within the scope of attached claims. Thus the invention is for example also applicable where reinforcing rods are snapped connected to the anchoring pipe.
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