DE3242161A1 - Maintenance-free plastic post for lamps, traffic lights, traffic signs and the like - Google Patents

Abstract

In the case of a maintenance-free plastic post with metal reinforcement, for lights and traffic signs for example, in order to avoid, in a simple and cost-saving manner, the expensive reinforcement in the form of a steel tube, until now deemed necessary in practice, and to make do with a reinforcement in the form of a bar or wire, the invention proposes constructing the post in a way known per se from an outer tube 2 and an inner tube 1 of smooth, impact-resistant plastic and filling the intermediate space 3 with a filling composition which firmly encloses and firmly holds the reinforcing elements 4 in such a way that, when bending loads occur on the post, they cannot cut into the core and which avoids during production the occurrence of air inclusions even at points which are not easily accessible. For this purpose, the filling composition comprises a mortar of a fine mineral cement with a small proportion of readily dispersible plastic, which in the pouring state is particularly fluid and thereafter, as it cures, encloses the reinforcing elements firmly and immovably. <IMAGE>

Description

Maintenance-free plastic mast for lights, traffic lights, traffic signs and the like

It is well known that masts for e.g. lights, traffic signs, To manufacture traffic lights and the like from plastic. There are two main groups differentiated, namely those made exclusively of plastic, mostly glass fiber reinforced Existing plastic masts and those whose plastic cross-section through rod, Lattice or tubular reinforcement made of metal is reinforced.

Both types have common advantages, once that it is easier than in the case of metal masts, it is possible to ensure full electrical protection and on the other hand, the so-called maintenance-free, according to which these masts are not like wooden or watch metal masts and act accordingly if there are signs of weathering or rust must treat. In contrast, both types of mast differ in their rigidity speed and strength against bending stresses is essential, because despite the often high glass fiber admixtures a "pure" plastic mast cannot have the same strength and rigidity as reach a metal armored mast.

The invention is directed to a maintenance-free mast made of plastic with metal reinforcement.

It is also known to convert the plastic part into a thicker core made of foam or plastic cement and a comparatively thinner shell made of one Split dense, relatively impact-resistant plastic with a smooth surface.

For example, it is proposed in CH-PS 359 273 and DE-GMS 1 792 750, the mast made of two plastic pipes arranged concentrically at a distance from one another to build up and the resulting space with a plastic foam or to be filled in with the appropriate synthetic cement, with the latter as an addition, e.g. chalk can contain and has a compressive strength of less than 1 N / mm2 and that outer plastic tube accommodates the metal reinforcement.

In practice, however, all of these suggestions have only then proven themselves can, if embedded in the core as reinforcement, with openings for the Plastic passage provided steel pipe is embedded as reinforcement, as it is DE-OS 26 36 973 shows and describes. In foam or stretched with chalk, However, mainly only cement made of plastic embedded rod or embedded rope-like reinforcement elements, e.g.

Glass silk strands or iron rods are already used in practice during transport or storage, but even more so after the installation of the mast is not so firmly anchored in the cross-section that it bends the If you would like to take part in the mast, you should rather try, even if the mast is bent to keep their straight position, and doho they cut into the core mass, and in order to avoid the associated loss of strength, it was previously called Considered indispensable to embed a steel pipe as a reinforcement element, although it would not have been necessary based on strength calculations alone.

Embedding the reinforcement elements in plastic foam or pure However, stretched or unstretched synthetic cement also has the disadvantage that these substances have only a poor flowability and therefore often solidify, before they have filled all of the space to be filled in, especially hard accessible places, zOBo in places where the longitudinal reinforcements hold them, transverse rings meet or if a corresponding one in the case of detached masts remote reinforcement forms "dead corners".

Accordingly, the invention was based on the task of a maintenance-free To create plastic mast with metal reinforcement that is easy and cost-saving to manufacture is, gets by with a ketallbar or rope reinforcement, and in which the core cross-section the metal reinforcement firmly and immovably encloses and no air inclusions allows, Taking into account the mast constructions of this type, which have also been used up to now underlying consideration that the reinforcement receiving core from a If the material is cheaper to manufacture than the smooth outer shell, the Invention based on the knowledge that the replacement of the expensive and actually unnecessary Steel pipes through reinforcing bars or ropes their fixed anchoring in the cross-section also with bending stress presupposes that then, however, the risk that to the de Nodal points of the longitudinal reinforcements required to absorb the tensile forces with the element securing their correct position during manufacture, e.g. spacer rings and the like., air inclusions arise in the Kermanterial, rather is increased, accordingly The general idea behind the winding lies in it, for the core forming and the reinforcement receiving mass to provide such that on the one hand extremely flowable is and on the other hand, after hardening, the reinforcing bars or cables immovable holds on.

An embodiment of the invention is shown in the drawing, 1 shows a horizontal section through a mast according to the invention in a reduced size Scale, FIG. 2 an enlarged section II of FIG. 1 and FIG. 3 a partial view, seen in arrow direction III of FIG.

In the illustrated embodiment, the solution is the Invention underlying task of the Yjast in a known manner from two constructed concentrically arranged plastic pipes, namely an inner pipe 1 and an outer tube 20. With a mast length of 5 m, the inner tube can be a Have a wall thickness of 2 mm, while the outer tube has a wall thickness with the same mast length of 3 mm. The outer tube should be made of an impact-resistant, weather-resistant Made of plastic, the inner tube can be made of the same or less high quality Be made of material.

In the space 3 between the tubes 1 and 2 is during manufacture a reinforcement of longitudinal bars 4 made of iron, to increase the adhesion with the Filler introduced appropriately profiled rods. These rods are in their Prescribed position held by plastic rings 5, which both the tubes 1 and 2 hold radially as well as the rods 4 on the circumference at the intended distances.

For this purpose, either tightly fitting or attachable to the inner tube 1 can be used Plastic rings are used with suitable retaining elements for the reinforcing bars and spacer elements for centering the outer tube 2 are provided. In which illustrated example, the ring is provided with lyre-like clamps 6, in the the rods 4 can snap into place, This configuration has the advantage that you with the clamps bars of different diameters, e.g. next to bars 4 as well Rods 4 'of larger diameter, can fix what is listed below Reasons may be beneficial, although the two will use the lyre-shaped clamp forming ridges or lips the inclusion of reinforcing bars Spread a little wider with a larger diameter than when picking up smaller diameters, but that changes the distance to the outer tube only slightly and should be negligible be.

FiE 3 as a partial view of a mast according to the invention in the direction of the arrow III of Fig. 1 seen, in which the front half of the outer shell 2 is removed, shows a so-called. Door cutout 7 in the inner tube 1, as it is for Silaste with electrical Interior fittings is required and how he weakened the mast cross-section conditional. To compensate for this, the vertical edge areas of the door cutout 7 Be reinforced by stronger rebars. is in the example shown also another stronger rod 4 "up close to the top and bottom horizontal Edge of the door cut-out brought up.

Then an extremely flowable mortar made of mineral, special eiu cement and a small proportion of easily dispersible plastic, for example in Ratio 3.5 parts powder to 1 part water and this in the upright through the standing double pipe 1.2 formed space 5 filled with reinforcement core 4.5 from above. This mortar is so thin that, rising from below, it is parallel to itself to the surface of the earth adjusting mirror the entire space including all heavy accessible places completely filled. The mortar is already after a few hours cured to the point that the mast can be stored 0 After complete curing the core achieves a compressive strength at a density between 1.5 and 2 g / cm³ of more than 35 N / mm², a bending Tensile strength of over 10 N / mm² and a Brinell ball indentation hardness of almost 80 N / mm².

Fine quartz sand up to 30% can also be added to the mortar powder be, whereby its flowability is increased and still only small losses the specified strengths are to be accepted.

After the final hardening, a solid, practical one is created Pore-free, the reinforcement bars tightly enclosing and immovably anchored Core, the higher weight compared to foam is compensated for by the fact that With reinforcement, continuous steel pipes no longer have to be used.

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Claims (1)

P a t e n t ~ -n s r ii 0 h e 1. Maintenance-free plastic mast for Lights, traffic lights, traffic signs and dglo, consisting of an envelope or Outer tube made of solid, weather-resistant plastic, e.g. polycarbonate, and a on the other hand, a thicker core made of a less high quality compared to the cladding tube Material in which a tensile force-absorbing metal reinforcement is embedded, thereby g e k e n -n -z e i c h n e t that the core in a known manner between the filling tube (2) and an inner tube (1) and from one in the poured-in state very thin and then hardening mortar, which consists of a larger Share of fine mineral cement and a smaller share of good dispersibility Plastic is composed and in the spaced rod or rope-shaped reinforcement elements (4) are embedded 0 2. Plastic mast after claim 4, characterized in that it contains plastic Mortar is a maximum of 5. 3. Plastic mast according to claim 1, characterized in that g e k e n n z e i c n e t that very fine quartz sand is mixed with up to 30% of the mortar, 4. - plastic mast according to claims 1 to 3, characterized in that the hardened Mortar with a density of about 1.7 g / cm3 has a compressive strength of over 35 one. 3 tensile strength of over 10 H / mm2, a Brinell ball indentation hardness of almost 80 N / mm² and a density between 1.5 and 2.0. 5. Plastic mast according to claim 1, characterized in that g e k e n n z e i c N e t that the reinforcing bars or cables (4) in terminals (6) from horizontal Plastic rings (5) lying in the core are held. 6. Plastic mast according to claim 5, characterized in that g e k e n n z e i c N e t that the clamps (6) are also spacer cams0 7 .. plastic mast according to claim 5, characterized in that the clamps (6) are made of Lyra-shaped webs exist and to accommodate reinforcing bars or - ropes (4) of different diameters are suitable. Plastic mast with a door panel according to claim 1, characterized in that Note that at least near the vertical side edges of the Aus Reinforcement bars or cables thicker in section than provided in the rest of the cross-section are