DE7212735U - Plastic sleeper, especially for a ballastless track - Google Patents

Description

Vereinigte Österreichische Eisen- und Stahlwerke Aktiengesellschaft
Linz (Austria)

Plastic sleeper

The innovation concerns a plastic sleeper with inserts for rail fastening.

In the case of a ballastless superstructure, it is known that a concrete foundation is produced which has corresponding depressions in which the sleepers are embedded. A precondition for this is a special dimensional accuracy of the sleepers. Such dimensional accuracy can hardly be achieved with the usual wooden sleepers, which have the further disadvantage that they are too little weatherproof. are moisture-resistant and therefore have to be replaced relatively often. Can reinforced concrete sleepers also not having the required dimensional accuracy mfd a ^J; be ellt and have an extremely high weight, which increases the cost of transportation and the handling during installation or replacement

the sleepers "made considerably more difficult. Sheet steel sleepers are again good electrical conductors and therefore for electrically "operated railways" on the sleepers installed pantograph rails are hardly suitable because of the additional insulation required. None of the usual So sleepers are really useful for ballastless superstructures.

There are a number of ways to remedy this Plastic sleepers have been proposed. A thermoset is usually used as the plastic, V to which a filler is added, so that the plastic is more or less only used as a binder for the filler * serves. Thresholds consisting only of a thermoset would be due to their brittleness and other physical properties Properties of the plastic are unsuitable from the start. To increase strength and To achieve nut threads for rail retaining screws, It is also known to use metal inserts in the plastic sleepers to embed. Nevertheless, plastic sleepers could not prove themselves in practice. Kick it namely due to the absorption of moisture on dimensional changes. In addition, there are surface changes due to ultraviolet radiation and the effects of the weather to be observed. * The weight is slightly higher than that of the wooden sleepers and therefore with a view to quick and easy installation still too big. In addition, the control of the material properties is more voluminous in the production Blocks, as they represent GIeisschweilen, difficult.

Finally, all previous thresholds of Sacliteil adheres to that, since the dew point of the laid sleepers in r m-mi ttelbarer vicinity of the surface is ^ Feuchtigkeitsnieäerschlage are inevitable, so that the original electrical insulation values comparable

go lorries and leakage currents may occur.

Accordingly, the innovation is based on the task of eliminating all these deficiencies and creating a plastic track sleeper that is characterized by high dimensional accuracy and dimensional accuracy. Has a low weight and a lasting high electrical Ιεσ-lationswert and is relatively simple in the \ preparation.

The innovation solves the task set by

L that the threshold is made of high-density plastic rigid foam, preferably rigid polyurethane foam, which is at least in the rail support area Volume weight of 300 to 500 kg / nr, with as Inlay in plastic hard foam panels or discs with nut thread for the rail retaining screws that can be inserted into channels in the rigid foam. In contrast to the previous plastic sleepers, the plastic does not serve as a binding agent for fillers, only the rigid plastic foam is present. Such a threshold can be easily produced, it only needs the plastic mixture in one

The mold, which is closed on all sides, is poured in, so ifsröoa, yofeei the resulting foam presses against the wall of the mold and this automatically results in the desired compression. The density of 300 to 500 kg / nr brings the necessary compressive strength with it, whereby -it is only a matter of measuring the amount of the mixture to be poured into the mold in question. Rigid plastic foam, in particular rigid polyurethane foam, is completely weather-resistant and moisture-repellent at the required degree of compression, so that the hating accuracy achieved by foaming in the mold and the static properties

shafts of the sleeper body are also permanently preserved. It goes without saying that such a The track sleeper has a high electrical insulation value. For electrically operated railways, in particular for those with pantograph rails laid on the sleepers, however, it is of particular importance that with laid sleepers the dew point at a considerable distance from the sleeper surface

'is practically in the middle of the threshold, so that no moisture build-up (Dew or condensation) is to be feared. Therefore, the sleepers according to the invention without further ado, also lined with metal tubings Tunnels are laid without the risk of corrosion caused by leakage currents. Since it is is a rigid foam, the weight of the sleepers is comparatively low and is about Half the weight of wooden sleepers, so that transport weight is saved and the sleeper is relocated is made much easier.

It is already known, for example furniture parts made from compressed rigid foam. However, these are all construction parts

| "| with a relatively small cross-section size * Has.

has obviously shied away from large-volume bodies that should have a corresponding strength, made of rigid foam because they feared an uneven structure of the body. Practical tests have shown, however, that the track sleepers according to the innovation are the ones placed on them Requirements fully met.

Around the bracket screws in the threshold to be able to anchor, are in the plastic hard bolt Plates or washers with nut threads included.

- 5 being the screws through preformed in the sleeper

Channels to get to the plates or discs.

The plates or disks can have passage openings for the hard plastic foam and Wear welded nuts for the rail retaining screws, making a particularly useful construction is achieved in which there is a good flow through the

Plates results, which at the same time the bending stiffness of the \. Raised threshold body. As the plates or disks are fully enclosed by rigid plastic foam! J) the electrical Iso-Ϊ through these metallic inserts - lation value not impaired. It would also be possible to provide wooden inlays, which are also used to increase contribute to the flexural rigidity and above all the sound-absorbing value to enhance.

In the drawing, the innovation is shown in one embodiment, and zv? Ar demonstrate

Fig. 1 shows a sleeper in the diagram, Pig. 2 in partial section along the line II-II in FIG. 1

on a larger scale,

Pig .. 3 a finished mold for Her st rush a Gieis- _"x sehwelle in vertical section and

Pig. 4 shows an insert plate in plan view.

The threshold 1 consists of highly compressed plastic Eartschaum 2, in which insert plates 3 are embedded are. In order to be able to anchor the rail retaining screws in the threshold, these are insert plates or discs with Hatterge winäe for these Provide rail retaining screws.

In the example shown in the drawing the nuts and bolts of the door are the rail mounting screws through, on the plates 3 screwed screws

- O -

nuts 5 formed. Ia area of the cutter 5 are channels formed through which the rail retaining screws are inserted * n ground.

The insert plates 3 have. Passage openings for the plastic rigid foam on, so that when manufacturing the sleeper results in a good flow through the plates, which at the same time increases the flexural strength of the sleeper body raise.

To produce the sleeper 1, a completely closed .Fora 7 (Fig. 3) i the bottom of which has 8 wells

^ 2 to receive the head of screw bolts 10, which correspond to the rail retaining screws. The bolts 10 are screwed into the nuts 4 of the insert plates 3 and then inserted with removed 5'ormdeckel I ¹ I in the bottom recesses 9, the the insert plates 3 are in about Pormmitte. The length of the screw bolts 10 is such that cie corresponds to the clear height of the mold 7, so that the screw bolts 10 are supported at the top of the mold cover 1 to prevent the insert plates from floating up when the plastic mixture is poured into the mold. The filled plastic mixture foams in

(of the mold and presses against the mold walls so that it is compressed accordingly and given a completely smooth surface. After the plastic has hardened if the shaped cover 11 <_ loosens, the finished threshold 1 taken out of the mold, whereupon only the screw bolts 10 have to be unscrewed.

721273S-B.9.73

Claims (2)

Protection claims: Λ . Plastic track shaft with inserts for rail fastening, characterized in that the sleeper (1) is made of highly compressed plastic rigid foam (2) _5, preferably polyurethane rigid foam, which has an Eaumgeviicht of 300 "to 500 kg / no. At least in the rail support" area The inserts in the rigid plastic foam (2) include plates (3) or washers with a nut thread for the rail retaining screws that can be inserted into channels (6) in the rigid foam. 2. Plastic sleeper according to claim * Ί, characterized characterized in that the plates (3) or disks have passage openings (4) for the plastic hard foam (2) and carry welded nuts (5) for the rail retaining screws.