DE969163C - One- or two-part concrete sleeper dowels made of flexible material - Google Patents

Description

One or two-part concrete sleeper dowels made of flexible material It is known to be specially prepared for fastening rails to concrete sleepers Use solid wood dowels. But such dowels have the disadvantage that in use the fiber structure is torn by the sharp threads of the sleeper screws. Over time, operational vibrations cause the sleeper screws to loosen a. Penetrating water brings the dowels, especially where a Structural damage to the fibers has occurred through the screw threads, resulting in swelling, and there is soon destruction of the area where the rail is fastened most essential point. In addition, such dowels do not have that special either insulation properties required for rail traffic. As you know, there is a big one Tel the train monitoring by electrical means through the rail line.

Furthermore, one-piece sleeper dowels are made from asbestos cement known to have an internal thread that is narrower than the turns of the sleeper screw. Since asbestos cement is a somewhat flexible material, the same must be used here Defects occur as with solid wood dowels. It is also known to work with dowels Resin-bonded fillers provide an internal thread, the internal thread being the has the same slope as the screw. Such screw but can in the long run with the vibrations caused by the train traffic do not have a tight fit and must loosen.

It has now been found that when using synthetic resin impregnated Plywood, laminated or Pr.eßholz as dowel material, in which the internal thread is the production is pressed in, the defects described do not occur and the Rails are attached to the concrete sleepers so that they can be loosened the constant traffic no longer occurs and that atmospheric influences are eliminated are.

According to the invention, plywood, laminated wood or materials can be used Use compressed wood, whereby for the production of the synthetic resin-glued or impregnated Materials thermosetting resins in the form of glue films or glues in liquid form, preferably based on phenol formaldehyde can be used.

The mass production of such dowels is simple, whereby in the case of one-piece dowels in the central axis during the pressing process one of the later To be used screw adapted thread of smaller diameter is pressed. In the case of two-part dowels, according to the invention, one of the later is placed on the inner surface to be used screw adapted thread of smaller diameter, z. B. Thread a Bundschwellen- or Tirefondschraur2, also during the pressing process pressed in.

Synthetic resin-soaked wood veneers are preferably used as a screw trained center axis wound and this package in a correspondingly designed Mold pressed into a dowel in the heat. After the pressing process, the screw removed and with the later use by such a larger diameter replaced. With these plywood dowels, there is no tearing of the wood structure a.

In the same way, two-part dowels can be produced that are even easier to manufacture and prove to be particularly advantageous in practice have proven themselves.

The outside of the dowel will; useful for better anchoring in concrete not smooth, but wavy; grooved or screwed.

Also, it is advantageous to use these dowels according to the invention during manufacture The concrete sleepers should be poured in immediately, since then their bond with the sleeper is even bigger and better than when it is later - e.g. B. as a two-part dowel - used will.

Claims (1)

PATENT CLAIM: One- or two-part concrete sleeper dowels made of flexible material, in which the internal thread dowel holilrauin has smaller cross-section dimensions compared to the sleeper screw to be used, characterized in that when using synthetic resin-hardened plywood, laminated or pressed wood as the dowel material, the internal thread is included is pressed in during manufacture. Documents considered: French Patent No. 917 146; British Patent No. 558 097; German patent application H 6936 V / 19 a.